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GitHub - stackus/ftgogo: FTGOGO - event-driven architecture demonstration application using edat
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</div> </modal-dialog></div> </div> <div data-action="click:qbsearch-input#retract" class="dark-backdrop position-fixed" hidden data-target="qbsearch-input.darkBackdrop"></div> <div class="color-fg-default"> <dialog-helper> <dialog data-target="qbsearch-input.feedbackDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="feedback-dialog" aria-modal="true" aria-labelledby="feedback-dialog-title" aria-describedby="feedback-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="feedback-dialog-title"> Provide feedback </h1> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="feedback-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button 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seriously.</p> <textarea name="feedback" class="form-control width-full mb-2" style="height: 120px" id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button form="code-search-feedback-form" data-action="click:qbsearch-input#submitFeedback" type="submit" data-view-component="true" class="btn-primary btn"> Submit feedback </button> </div> </dialog></dialog-helper> <custom-scopes data-target="qbsearch-input.customScopesManager"> <dialog-helper> <dialog data-target="custom-scopes.customScopesModalDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="custom-scopes-dialog" aria-modal="true" aria-labelledby="custom-scopes-dialog-title" aria-describedby="custom-scopes-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header Overlay-header--divided"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="custom-scopes-dialog-title"> Saved searches </h1> <h2 id="custom-scopes-dialog-description" class="Overlay-description">Use saved searches to filter your results more quickly</h2> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="custom-scopes-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button Overlay-closeButton"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="custom-scopes-dialog-title"> <div data-view-component="true" class="Overlay-body"> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <div hidden class="create-custom-scope-form" data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" 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2.813-5.032 3.855a1.697 1.697 0 0 1-1.33 0c-2.447-1.042-4.049-2.357-5.032-3.855C1.32 10.182 1 8.566 1 7V3.48a1.75 1.75 0 0 1 1.217-1.667Zm.61 1.429a.25.25 0 0 0-.153 0l-5.25 1.68a.25.25 0 0 0-.174.238V7c0 1.358.275 2.666 1.057 3.86.784 1.194 2.121 2.34 4.366 3.297a.196.196 0 0 0 .154 0c2.245-.956 3.582-2.104 4.366-3.298C13.225 9.666 13.5 8.36 13.5 7V3.48a.251.251 0 0 0-.174-.237l-5.25-1.68ZM8.75 4.75v3a.75.75 0 0 1-1.5 0v-3a.75.75 0 0 1 1.5 0ZM9 10.5a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path> </svg> </span> <span data-view-component="true" class="ActionListItem-label"> Security </span> </a> </li> <li hidden="hidden" data-menu-item="i6insights-tab" data-targets="action-list.items" role="none" data-view-component="true" class="ActionListItem"> <a tabindex="-1" id="item-d2839c7e-eb9e-44ee-8e6a-d73fedca74c4" href="/stackus/ftgogo/pulse" role="menuitem" data-view-component="true" class="ActionListContent ActionListContent--visual16"> <span class="ActionListItem-visual 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data-target="react-partial.embeddedData">{"props":{"initialPayload":{"allShortcutsEnabled":false,"path":"/","repo":{"id":327507286,"defaultBranch":"master","name":"ftgogo","ownerLogin":"stackus","currentUserCanPush":false,"isFork":false,"isEmpty":false,"createdAt":"2021-01-07T04:56:50.000Z","ownerAvatar":"https://avatars.githubusercontent.com/u/158579?v=4","public":true,"private":false,"isOrgOwned":false},"currentUser":null,"refInfo":{"name":"master","listCacheKey":"v0:1627699720.927497","canEdit":false,"refType":"branch","currentOid":"c5028ec7edb09749f234ff4086b0e25e1cedca4d"},"tree":{"items":[{"name":"accounting","path":"accounting","contentType":"directory"},{"name":"config/postgresql","path":"config/postgresql","contentType":"directory","hasSimplifiedPath":true},{"name":"consumer","path":"consumer","contentType":"directory"},{"name":"customer-web","path":"customer-web","contentType":"directory"},{"name":"delivery","path":"delivery","contentType":"directory"},{"name":"deployment/kubernetes","path":"deployment/kubernetes","contentType":"directory","hasSimplifiedPath":true},{"name":"docs","path":"docs","contentType":"directory"},{"name":"kitchen","path":"kitchen","contentType":"directory"},{"name":"monolith","path":"monolith","contentType":"directory"},{"name":"order-history","path":"order-history","contentType":"directory"},{"name":"order","path":"order","contentType":"directory"},{"name":"restaurant","path":"restaurant","contentType":"directory"},{"name":"serviceapis","path":"serviceapis","contentType":"directory"},{"name":"shared-go","path":"shared-go","contentType":"directory"},{"name":"store-web","path":"store-web","contentType":"directory"},{"name":".dockerignore","path":".dockerignore","contentType":"file"},{"name":".editorconfig","path":".editorconfig","contentType":"file"},{"name":".gitignore","path":".gitignore","contentType":"file"},{"name":"Dockerfile","path":"Dockerfile","contentType":"file"},{"name":"Dockerfile.development","path":"Dockerfile.development","contentType":"file"},{"name":"FTGOGO.postman_collection.json","path":"FTGOGO.postman_collection.json","contentType":"file"},{"name":"Makefile","path":"Makefile","contentType":"file"},{"name":"README.md","path":"README.md","contentType":"file"},{"name":"docker-compose-monolith.yml","path":"docker-compose-monolith.yml","contentType":"file"},{"name":"docker-compose-use-kafka.yml","path":"docker-compose-use-kafka.yml","contentType":"file"},{"name":"docker-compose.development.yml","path":"docker-compose.development.yml","contentType":"file"},{"name":"docker-compose.yml","path":"docker-compose.yml","contentType":"file"}],"templateDirectorySuggestionUrl":null,"readme":null,"totalCount":27,"showBranchInfobar":false},"fileTree":null,"fileTreeProcessingTime":null,"foldersToFetch":[],"treeExpanded":false,"symbolsExpanded":false,"isOverview":true,"overview":{"banners":{"shouldRecommendReadme":false,"isPersonalRepo":false,"showUseActionBanner":false,"actionSlug":null,"actionId":null,"showProtectBranchBanner":false,"publishBannersInfo":{"dismissActionNoticePath":"/settings/dismiss-notice/publish_action_from_repo","releasePath":"/stackus/ftgogo/releases/new?marketplace=true","showPublishActionBanner":false},"interactionLimitBanner":null,"showInvitationBanner":false,"inviterName":null,"actionsMigrationBannerInfo":{"releaseTags":[],"showImmutableActionsMigrationBanner":false,"initialMigrationStatus":null}},"codeButton":{"contactPath":"/contact","isEnterprise":false,"local":{"protocolInfo":{"httpAvailable":true,"sshAvailable":null,"httpUrl":"https://github.com/stackus/ftgogo.git","showCloneWarning":null,"sshUrl":null,"sshCertificatesRequired":null,"sshCertificatesAvailable":null,"ghCliUrl":"gh 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architecture demonstration application\u003c/h1\u003e\u003ca id=\"user-content-ftgogo---event-driven-architecture-demonstration-application\" class=\"anchor\" aria-label=\"Permalink: ftgogo - event-driven architecture demonstration application\" href=\"#ftgogo---event-driven-architecture-demonstration-application\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eIntroduction\u003c/h2\u003e\u003ca id=\"user-content-introduction\" class=\"anchor\" aria-label=\"Permalink: Introduction\" href=\"#introduction\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eftgogo (food-to-gogo) is a Golang implementation of\nthe \u003ca href=\"https://github.com/microservices-patterns/ftgo-application\"\u003eFTGO\u003c/a\u003e application described in the\nbook \u003ca href=\"https://www.manning.com/books/microservices-patterns\" rel=\"nofollow\"\u003e\"Microservice Patterns\"\u003c/a\u003e by Chris Richardson. A\nlibrary \u003ca href=\"https://github.com/stackus/edat\"\u003eedat\u003c/a\u003e was developed to provide for Golang many of the solutions\nthat \u003ca href=\"https://eventuate.io/\" rel=\"nofollow\"\u003eEventuate\u003c/a\u003e, the framework used by FTGO, provides for Java.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePurpose\u003c/h2\u003e\u003ca id=\"user-content-purpose\" class=\"anchor\" aria-label=\"Permalink: Purpose\" href=\"#purpose\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis repository exists to demonstrate the patterns and processes involved when constructing a distributed application\nusing \u003ca href=\"https://en.wikipedia.org/wiki/Event-driven_architecture\" rel=\"nofollow\"\u003eevent-driven architecture\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis repository started as a Golang clone of the FTGO demonstration application but as time goes on it will grow to\ndemonstrate additional microservice patterns and techniques.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWhat you'll find in this demonstration\u003c/h3\u003e\u003ca id=\"user-content-what-youll-find-in-this-demonstration\" class=\"anchor\" aria-label=\"Permalink: What you'll find in this demonstration\" href=\"#what-youll-find-in-this-demonstration\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#architecture\"\u003eArchitecture\u003c/a\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#clean-architecture\"\u003eClean Architecture\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#code-layout\"\u003eCode Layout\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#services\"\u003eServices\u003c/a\u003e\u003c/li\u003e\n\u003c/ol\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#design\"\u003eDesign\u003c/a\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#event-driven-architecture\"\u003eEvent-Driven Architecture\u003c/a\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#sagas\"\u003eSagas\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#outbox-pattern\"\u003eOutbox Pattern\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#message-deduplication\"\u003eMessage Deduplication\u003c/a\u003e\u003c/li\u003e\n\u003c/ol\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#cqrs\"\u003eCQRS\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#event-sourcing\"\u003eEvent Sourcing\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#backend-for-frontend-bff\"\u003eBackend-For-Frontend\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#grpc-and-protocol-buffers\"\u003eGRPC and Protocol Buffers\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#testing\"\u003eTesting\u003c/a\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#specifications--acceptance-tests\"\u003eSpecifications / Acceptance Tests\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#integration-tests\"\u003eIntegration Tests\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#unit-tests\"\u003eUnit Tests\u003c/a\u003e\u003c/li\u003e\n\u003c/ol\u003e\n\u003c/li\u003e\n\u003c/ol\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#other\"\u003eOther\u003c/a\u003e\n\u003col dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#tracing\"\u003eTracing\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#metricsinstrumentation\"\u003eMetrics/Instrumentation\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#mono-repository\"\u003eMono-repository\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#shared-code\"\u003eShared code\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#monolith\"\u003eMonolith\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#type-registration\"\u003eType Registration\u003c/a\u003e\u003c/li\u003e\n\u003c/ol\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#changes-from-ftgo\"\u003eChanges from FTGO\u003c/a\u003e\u003c/li\u003e\n\u003c/ol\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePrerequisites\u003c/h2\u003e\u003ca id=\"user-content-prerequisites\" class=\"anchor\" aria-label=\"Permalink: Prerequisites\" href=\"#prerequisites\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://www.docker.com/\" rel=\"nofollow\"\u003eDocker\u003c/a\u003e - Everything is built and run from a docker compose environment.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExecution\u003c/h2\u003e\u003ca id=\"user-content-execution\" class=\"anchor\" aria-label=\"Permalink: Execution\" href=\"#execution\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eOpen a command prompt and then execute the following docker command\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eNOTE: The first time you bring everything up the init script for Postgres will run automatically. The services will crash-loop for a bit because of that. Eventually things will stabilize.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMac, Linux, and Windows Users\u003c/h3\u003e\u003ca id=\"user-content-mac-linux-and-windows-users\" class=\"anchor\" aria-label=\"Permalink: Mac, Linux, and Windows Users\" href=\"#mac-linux-and-windows-users\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"docker-compose up\"\u003e\u003cpre\u003edocker-compose up\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eUse \u003ccode\u003eCtrl-C\u003c/code\u003e to stop all services.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRunning individual services\u003c/h3\u003e\u003ca id=\"user-content-running-individual-services\" class=\"anchor\" aria-label=\"Permalink: Running individual services\" href=\"#running-individual-services\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNot recommended but each service can be run using \u003ccode\u003ego run .\u003c/code\u003e. You'll need to use an \u003ccode\u003e.env\u003c/code\u003e file or set some environment\nvariables to properly run the service.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eUse \u003ccode\u003ego run . --help\u003c/code\u003e to see all the flags and environment variables that can be set.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eArchitecture\u003c/h2\u003e\u003ca id=\"user-content-architecture\" class=\"anchor\" aria-label=\"Permalink: Architecture\" href=\"#architecture\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eClean Architecture\u003c/h3\u003e\u003ca id=\"user-content-clean-architecture\" class=\"anchor\" aria-label=\"Permalink: Clean Architecture\" href=\"#clean-architecture\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"/stackus/ftgogo/blob/master/docs/hexagonal_architecture_w.png\"\u003e\u003cimg src=\"/stackus/ftgogo/raw/master/docs/hexagonal_architecture_w.png\" alt=\"Hexagonal Architecture Diagram\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eThe colors used for each component in the above diagram align with the ring colors used in clean architecture diagram.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIn this implementation\nof \u003ca href=\"https://blog.cleancoder.com/uncle-bob/2012/08/13/the-clean-architecture.html\" rel=\"nofollow\"\u003eclean architecture\u003c/a\u003e I am working\nmainly with\n\u003ca href=\"https://jmgarridopaz.github.io/content/hexagonalarchitecture.html\" rel=\"nofollow\"\u003eHexagonal Architecture\u003c/a\u003e or Ports \u0026amp; Adapters terms\nfrom those methodologies.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ePrimary Adapters (Driver Adapters)\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAdapter implementations are in \u003ccode\u003e/internal/handlers\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003ePort interfaces are in \u003ccode\u003e/internal/application/service.go\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003ePrimary Adapters \u003cstrong\u003eUSE\u003c/strong\u003e the interface the application \u003cstrong\u003eIMPLEMENTS\u003c/strong\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003eSecondary Adapters (Driven Adapters)\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAdapter implementations are in \u003ccode\u003e/internal/adapters\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003ePort interfaces are in \u003ccode\u003e/internal/application/ports\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003eSecondary Adapters \u003cstrong\u003eIMPLEMENT\u003c/strong\u003e the interface the application \u003cstrong\u003eUSES\u003c/strong\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eBringing the interfaces and implementations together looks about the same for all services. Below is an example from\nthe \u003ca href=\"/stackus/ftgogo/blob/master/consumer/cmd/service/main.go\"\u003eConsumer Service\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-go notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"package main\n\nimport (\n \u0026quot;github.com/stackus/ftgogo/consumer/internal/adapters\u0026quot;\n \u0026quot;github.com/stackus/ftgogo/consumer/internal/application\u0026quot;\n \u0026quot;github.com/stackus/ftgogo/consumer/internal/domain\u0026quot;\n \u0026quot;github.com/stackus/ftgogo/consumer/internal/handlers\u0026quot;\n \u0026quot;github.com/stackus/ftgogo/serviceapis\u0026quot;\n \u0026quot;shared-go/applications\u0026quot;\n)\n\nfunc main() {\n svc := applications.NewService(initService)\n if err := svc.Execute(); err != nil {\n panic(err)\n }\n}\n\nfunc initService(svc *applications.Service) error {\n serviceapis.RegisterTypes()\n domain.RegisterTypes()\n\n // Driven\n consumerRepo := adapters.NewConsumerRepositoryPublisherMiddleware(\n adapters.NewConsumerAggregateRepository(svc.AggregateStore),\n adapters.NewConsumerEntityEventPublisher(svc.Publisher),\n )\n\n app := application.NewServiceApplication(consumerRepo)\n\n // Drivers\n handlers.NewCommandHandlers(app).Mount(svc.Subscriber, svc.Publisher)\n handlers.NewRpcHandlers(app).Mount(svc.RpcServer)\n\n return nil\n}\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003epackage\u003c/span\u003e main\n\n\u003cspan class=\"pl-k\"\u003eimport\u003c/span\u003e (\n \u003cspan class=\"pl-s\"\u003e\"github.com/stackus/ftgogo/consumer/internal/adapters\"\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"github.com/stackus/ftgogo/consumer/internal/application\"\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"github.com/stackus/ftgogo/consumer/internal/domain\"\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"github.com/stackus/ftgogo/consumer/internal/handlers\"\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"github.com/stackus/ftgogo/serviceapis\"\u003c/span\u003e\n \u003cspan class=\"pl-s\"\u003e\"shared-go/applications\"\u003c/span\u003e\n)\n\n\u003cspan class=\"pl-k\"\u003efunc\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emain\u003c/span\u003e() {\n \u003cspan class=\"pl-s1\"\u003esvc\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e:=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eapplications\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003eNewService\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003einitService\u003c/span\u003e)\n \u003cspan class=\"pl-k\"\u003eif\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e:=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003esvc\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003eExecute\u003c/span\u003e(); \u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e!=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e {\n \u003cspan class=\"pl-s1\"\u003epanic\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eerr\u003c/span\u003e)\n }\n}\n\n\u003cspan class=\"pl-k\"\u003efunc\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003einitService\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003esvc\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003eapplications.\u003cspan class=\"pl-smi\"\u003eService\u003c/span\u003e) \u003cspan class=\"pl-smi\"\u003eerror\u003c/span\u003e {\n \u003cspan class=\"pl-s1\"\u003eserviceapis\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003eRegisterTypes\u003c/span\u003e()\n \u003cspan class=\"pl-s1\"\u003edomain\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003eRegisterTypes\u003c/span\u003e()\n\n \u003cspan class=\"pl-c\"\u003e// Driven\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003econsumerRepo\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e:=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eadapters\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003eNewConsumerRepositoryPublisherMiddleware\u003c/span\u003e(\n \u003cspan class=\"pl-s1\"\u003eadapters\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003eNewConsumerAggregateRepository\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003esvc\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003eAggregateStore\u003c/span\u003e),\n \u003cspan class=\"pl-s1\"\u003eadapters\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003eNewConsumerEntityEventPublisher\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003esvc\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003ePublisher\u003c/span\u003e),\n )\n\n \u003cspan class=\"pl-s1\"\u003eapp\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e:=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eapplication\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003eNewServiceApplication\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003econsumerRepo\u003c/span\u003e)\n\n \u003cspan class=\"pl-c\"\u003e// Drivers\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003ehandlers\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003eNewCommandHandlers\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eapp\u003c/span\u003e).\u003cspan class=\"pl-c1\"\u003eMount\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003esvc\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003eSubscriber\u003c/span\u003e, \u003cspan class=\"pl-s1\"\u003esvc\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003ePublisher\u003c/span\u003e)\n \u003cspan class=\"pl-s1\"\u003ehandlers\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003eNewRpcHandlers\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003eapp\u003c/span\u003e).\u003cspan class=\"pl-c1\"\u003eMount\u003c/span\u003e(\u003cspan class=\"pl-s1\"\u003esvc\u003c/span\u003e.\u003cspan class=\"pl-c1\"\u003eRpcServer\u003c/span\u003e)\n\n \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003enil\u003c/span\u003e\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCode Layout\u003c/h3\u003e\u003ca id=\"user-content-code-layout\" class=\"anchor\" aria-label=\"Permalink: Code Layout\" href=\"#code-layout\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eServices exist within a capability or domain folder. Within that folder you'll find the following layout.\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"/\u0026quot;domain\u0026quot; - A capability or domain that is a subdomain in the larger application domain\n|-/cmd - Parent for servers, cli, and tools that are built using the code in this domain\n| |-/cdc - CDC (Change Data Capture) server. If the service publishes messages it will also have this\n| |-/service - Primary service for this capability\n|-/internal - Use the special treatment of \u0026quot;internal\u0026quot; to sequester our code from the other services\n |-/adapters - Driven Adapter implementations.\n |-/application - Application core folder. Processes under this will implement business rules and logic\n | |-/commands - CQRS commands. Processes that apply some change to the subdomain\n | |-/ports - Application interfaces that the Driven Adapters implement.\n | |-/queries - CQRS queries. Processes that request information from the subdomain\n | |-service.go - Application interface and implementation that is used by the handlers, the Driver Adapters.\n |-/domain - The definitions and the domain rules and logic\n |-/handlers - Driver Adapter implementations\"\u003e\u003cpre lang=\"text\" class=\"notranslate\"\u003e\u003ccode\u003e/\"domain\" - A capability or domain that is a subdomain in the larger application domain\n|-/cmd - Parent for servers, cli, and tools that are built using the code in this domain\n| |-/cdc - CDC (Change Data Capture) server. If the service publishes messages it will also have this\n| |-/service - Primary service for this capability\n|-/internal - Use the special treatment of \"internal\" to sequester our code from the other services\n |-/adapters - Driven Adapter implementations.\n |-/application - Application core folder. Processes under this will implement business rules and logic\n | |-/commands - CQRS commands. Processes that apply some change to the subdomain\n | |-/ports - Application interfaces that the Driven Adapters implement.\n | |-/queries - CQRS queries. Processes that request information from the subdomain\n | |-service.go - Application interface and implementation that is used by the handlers, the Driver Adapters.\n |-/domain - The definitions and the domain rules and logic\n |-/handlers - Driver Adapter implementations\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRegarding the layout\u003c/h4\u003e\u003ca id=\"user-content-regarding-the-layout\" class=\"anchor\" aria-label=\"Permalink: Regarding the layout\" href=\"#regarding-the-layout\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis layout is an example of organizing code to achieve clean architecture. You do not need to use this layout to have\nimplemented clean architecture with Go. I've made and am likely to make more minor adjustments to this layout and do not\nconsider it perfect or the \"one\".\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eServices\u003c/h3\u003e\u003ca id=\"user-content-services\" class=\"anchor\" aria-label=\"Permalink: Services\" href=\"#services\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"/stackus/ftgogo/blob/master/docs/architecture.png\"\u003e\u003cimg src=\"/stackus/ftgogo/raw/master/docs/architecture.png\" alt=\"FTGOGO Architecture\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDownstream Services\u003c/h4\u003e\u003ca id=\"user-content-downstream-services\" class=\"anchor\" aria-label=\"Permalink: Downstream Services\" href=\"#downstream-services\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/accounting/cmd/service\"\u003eaccounting-service\u003c/a\u003e - the \u003ccode\u003eAccounting Service\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/consumer/cmd/service\"\u003econsumer-service\u003c/a\u003e - the \u003ccode\u003eConsumer Service\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/delivery/cmd/service\"\u003edelivery-service\u003c/a\u003e - the \u003ccode\u003eDelivery Service\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/kitchen/cmd/service\"\u003ekitchen-service\u003c/a\u003e - the \u003ccode\u003eKitchen Service\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/order/cmd/service\"\u003eorder-service\u003c/a\u003e - the \u003ccode\u003eOrder Service\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/order-history/cmd/service\"\u003eorder-history-service\u003c/a\u003e - the \u003ccode\u003eOrder History Service\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/restaurant/cmd/service\"\u003erestaurant-service\u003c/a\u003e the \u003ccode\u003eRestaurant Service\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCDC Services\u003c/h4\u003e\u003ca id=\"user-content-cdc-services\" class=\"anchor\" aria-label=\"Permalink: CDC Services\" href=\"#cdc-services\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/accounting/cmd/cdc\"\u003eaccounting-cdc\u003c/a\u003e - the \u003ccode\u003eAccounting CDC Service\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/consumer/cmd/cdc\"\u003econsumer-cdc\u003c/a\u003e - the \u003ccode\u003eConsumer CDC Service\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/kitchen/cmd/cdc\"\u003ekitchen-cdc\u003c/a\u003e - the \u003ccode\u003eKitchen CDC Service\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/order/cmd/cdc\"\u003eorder-cdc\u003c/a\u003e - the \u003ccode\u003eOrder CDC Service\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/restaurant/cmd/cdc\"\u003erestaurant-cdc\u003c/a\u003e the \u003ccode\u003eRestaurant CDC Service\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBackend-For-Frontend Services\u003c/h4\u003e\u003ca id=\"user-content-backend-for-frontend-services\" class=\"anchor\" aria-label=\"Permalink: Backend-For-Frontend Services\" href=\"#backend-for-frontend-services\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/customer-web/cmd/gateway\"\u003ecustomer-web\u003c/a\u003e - the \u003ccode\u003eCustomer Web Gateway Service\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/store-web/cmd/gateway\"\u003estore-web\u003c/a\u003e - the \u003ccode\u003eStore Web Gateway Service\u003c/code\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDesign\u003c/h2\u003e\u003ca id=\"user-content-design\" class=\"anchor\" aria-label=\"Permalink: Design\" href=\"#design\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eEvent-Driven Architecture\u003c/h3\u003e\u003ca id=\"user-content-event-driven-architecture\" class=\"anchor\" aria-label=\"Permalink: Event-Driven Architecture\" href=\"#event-driven-architecture\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAsynchronous messaging handles all inter-service communication. The exception is the communication from the BFF/UI layer\nto the downstream services.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSagas\u003c/h4\u003e\u003ca id=\"user-content-sagas\" class=\"anchor\" aria-label=\"Permalink: Sagas\" href=\"#sagas\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe same three sagas found in \u003ca href=\"https://github.com/microservices-patterns/ftgo-application\"\u003eFTGO\u003c/a\u003e have been implemented\nhere in the \u003ca href=\"/stackus/ftgogo/blob/master/order/cmd/service\"\u003eorder-service\u003c/a\u003e.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/order/internal/adapters/create_order_orchestration_saga.go\"\u003eCreateOrderSaga\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003esaga responsible for the creation of a new order\u003cbr\u003e\n\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"/stackus/ftgogo/blob/master/docs/createOrderSaga.png\"\u003e\u003cimg src=\"/stackus/ftgogo/raw/master/docs/createOrderSaga.png\" alt=\"Steps\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/order/internal/adapters/cancel_order_orchestration_saga.go\"\u003eCancelOrderSaga\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003esaga responsible for the cancelling and releasing of order resources like tickets and accounting reserves\u003cbr\u003e\n\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"/stackus/ftgogo/blob/master/docs/cancelOrderSaga.png\"\u003e\u003cimg src=\"/stackus/ftgogo/raw/master/docs/cancelOrderSaga.png\" alt=\"Steps\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"/stackus/ftgogo/blob/master/order/internal/adapters/revise_order_orchestration_saga.go\"\u003eReviseOrderSaga\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003esaga responsible for the processing the changes made to an open order\u003cbr\u003e\n\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"/stackus/ftgogo/blob/master/docs/reviseOrderSaga.png\"\u003e\u003cimg src=\"/stackus/ftgogo/raw/master/docs/reviseOrderSaga.png\" alt=\"Steps\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOutbox Pattern\u003c/h4\u003e\u003ca id=\"user-content-outbox-pattern\" class=\"anchor\" aria-label=\"Permalink: Outbox Pattern\" href=\"#outbox-pattern\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAn implementation of the \u003ca href=\"http://www.kamilgrzybek.com/design/the-outbox-pattern/\" rel=\"nofollow\"\u003eoutbox pattern\u003c/a\u003e can be used to ensure\nall messages arrive at their destinations. It provides the solution to\nthe \u003ca href=\"https://thorben-janssen.com/dual-writes/\" rel=\"nofollow\"\u003edual write problem\u003c/a\u003e. Any service that publishes messages is actually\npublishing the message into the database. A CDC sibling service then processes the messages from the database and\npublishes the message into NATS Streaming. This process provides at-least-once delivery.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"/stackus/ftgogo/blob/master/docs/outbox_pattern_bg.png\"\u003e\u003cimg src=\"/stackus/ftgogo/raw/master/docs/outbox_pattern_bg.png\" alt=\"Outbox Pattern Diagram\" style=\"max-width: 100%;\"\u003e\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMessage Deduplication\u003c/h4\u003e\u003ca id=\"user-content-message-deduplication\" class=\"anchor\" aria-label=\"Permalink: Message Deduplication\" href=\"#message-deduplication\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eTODO\u003c/strong\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis will be a new feature added to the \u003ca href=\"https://github.com/stackus/edat\"\u003eedat\u003c/a\u003e library.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCQRS\u003c/h3\u003e\u003ca id=\"user-content-cqrs\" class=\"anchor\" aria-label=\"Permalink: CQRS\" href=\"#cqrs\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eEach service divides the requests it receives into commands and queries. Using a simple design\ndescribed \u003ca href=\"https://threedots.tech/post/basic-cqrs-in-go/\" rel=\"nofollow\"\u003ehere\u003c/a\u003e by \u003ca href=\"https://threedotslabs.com/\" rel=\"nofollow\"\u003eThree Dots Labs\u003c/a\u003e all of\nour handlers can be setup to use a command or query.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis is a very limited in scope implementation\nof \u003ca href=\"https://docs.microsoft.com/en-us/azure/architecture/patterns/cqrs\" rel=\"nofollow\"\u003eCQRS\u003c/a\u003e. It is valid in that we have two things\nwhere before we had one. Command and query have been segregated to separate responsibilities.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ca href=\"/stackus/ftgogo/blob/master/order-history\"\u003eOrder History\u003c/a\u003e Service provides an order by consumer read-model.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eEvent Sourcing\u003c/h3\u003e\u003ca id=\"user-content-event-sourcing\" class=\"anchor\" aria-label=\"Permalink: Event Sourcing\" href=\"#event-sourcing\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSeveral services use event sourcing and keep track of the changes to aggregates using commands and recorded events.\nCheck out the \u003ca href=\"/stackus/ftgogo/blob/master/order/internal/domain/order.go\"\u003eOrder\u003c/a\u003e aggregate for an example.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBackend-For-Frontend (BFF)\u003c/h3\u003e\u003ca id=\"user-content-backend-for-frontend-bff\" class=\"anchor\" aria-label=\"Permalink: Backend-For-Frontend (BFF)\" href=\"#backend-for-frontend-bff\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe project now demonstrates the \u003ca href=\"https://samnewman.io/patterns/architectural/bff/\" rel=\"nofollow\"\u003ebackend-for-frontend\u003c/a\u003e pattern with\nthe addition of a Customer-Web service. These types of services are purpose built API Gateways that serve a specific\nclient experience.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe addition of these BFFs also provide a place to implement cross-cutting concerns such as authorization and\nauthentication. I've tried to add demonstrations of the capabilities of what a BFF might do for a microservices\napplication.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGRPC and Protocol Buffers\u003c/h3\u003e\u003ca id=\"user-content-grpc-and-protocol-buffers\" class=\"anchor\" aria-label=\"Permalink: GRPC and Protocol Buffers\" href=\"#grpc-and-protocol-buffers\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWith the addition of the first BFF, GRPC is now used in place of HTTP by the handlers. GRPC is a\nsubjectively \u003ca href=\"https://cloud.google.com/blog/products/api-management/understanding-grpc-openapi-and-rest-and-when-to-use-them\" rel=\"nofollow\"\u003ebetter\u003c/a\u003e\nchoice for communication between your applications Api Gateway or BFF than using HTTP with REST. The move to GRPC was\ndone leaving the contracts previously used by HTTP endpoints unchanged as much as possible.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTesting\u003c/h3\u003e\u003ca id=\"user-content-testing\" class=\"anchor\" aria-label=\"Permalink: Testing\" href=\"#testing\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSpecifications / Acceptance Tests\u003c/h4\u003e\u003ca id=\"user-content-specifications--acceptance-tests\" class=\"anchor\" aria-label=\"Permalink: Specifications / Acceptance Tests\" href=\"#specifications--acceptance-tests\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eExecutable specifications written in Gherkin have been added to most services. You can find these in the \u003ccode\u003e/features\u003c/code\u003e\ndirectories.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThese specifications can be executed using the \u003ca href=\"https://github.com/cucumber/godog\"\u003egodog\u003c/a\u003e Cucumber tool. The Makefile\ntarget \u003ccode\u003erun-feature-tests\u003c/code\u003e can be used to run all the specifications across all services. Below is an example output\nfrom running the \u003ca href=\"/stackus/ftgogo/blob/master/consumer/features/register_consumer.feature\"\u003eConsumer Registration\u003c/a\u003e specification.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-gherkin-feature notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"Feature: Register Consumer\n\n Scenario: Consumers can be registered # features\\register_consumer.feature:4\n When I register a consumer named \u0026quot;Able Anders\u0026quot; # register_consumer.go:15 -\u0026gt; *FeatureState\n Then I expect the command to succeed # feature_state.go:72 -\u0026gt; *FeatureState\n\n Scenario: Consumers must be registered with a name # features\\register_consumer.feature:8\n When I register a consumer named \u0026quot;\u0026quot; # register_consumer.go:15 -\u0026gt; *FeatureState\n Then I expect the command to fail # feature_state.go:64 -\u0026gt; *FeatureState\n And the returned error message is \u0026quot;cannot register a consumer without a name\u0026quot; # feature_state.go:80 -\u0026gt; *FeatureState\n\n Scenario: Duplicate consumer names do not cause conflicts # features\\register_consumer.feature:13\n Given I register a consumer named \u0026quot;Able Anders\u0026quot; # register_consumer.go:15 -\u0026gt; *FeatureState\n When I register another consumer named \u0026quot;Able Anders\u0026quot; # register_consumer.go:15 -\u0026gt; *FeatureState\n Then I expect the command to succeed # feature_state.go:72 -\u0026gt; *FeatureState\"\u003e\u003cpre\u003e\u003cspan class=\"pl-k\"\u003eFeature\u003c/span\u003e:\u003cspan class=\"pl-s\"\u003e Register Consumer\u003c/span\u003e\n\n \u003cspan class=\"pl-k\"\u003eScenario\u003c/span\u003e:\u003cspan class=\"pl-s\"\u003e Consumers can be registered # features\\register_consumer.feature:4\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eWhen \u003c/span\u003eI register a consumer named \u003cspan class=\"pl-s\"\u003e\"Able Anders\"\u003c/span\u003e\u003cspan class=\"pl-c\"\u003e # register_consumer.go:15 -\u0026gt; *FeatureState\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eThen \u003c/span\u003eI expect the command to succeed\u003cspan class=\"pl-c\"\u003e # feature_state.go:72 -\u0026gt; *FeatureState\u003c/span\u003e\n\n \u003cspan class=\"pl-k\"\u003eScenario\u003c/span\u003e:\u003cspan class=\"pl-s\"\u003e Consumers must be registered with a name # features\\register_consumer.feature:8\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eWhen \u003c/span\u003eI register a consumer named \u003cspan class=\"pl-s\"\u003e\"\"\u003c/span\u003e\u003cspan class=\"pl-c\"\u003e # register_consumer.go:15 -\u0026gt; *FeatureState\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eThen \u003c/span\u003eI expect the command to fail\u003cspan class=\"pl-c\"\u003e # feature_state.go:64 -\u0026gt; *FeatureState\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eAnd \u003c/span\u003ethe returned error message is \u003cspan class=\"pl-s\"\u003e\"cannot register a consumer without a name\"\u003c/span\u003e\u003cspan class=\"pl-c\"\u003e # feature_state.go:80 -\u0026gt; *FeatureState\u003c/span\u003e\n\n \u003cspan class=\"pl-k\"\u003eScenario\u003c/span\u003e:\u003cspan class=\"pl-s\"\u003e Duplicate consumer names do not cause conflicts # features\\register_consumer.feature:13\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eGiven \u003c/span\u003eI register a consumer named \u003cspan class=\"pl-s\"\u003e\"Able Anders\"\u003c/span\u003e\u003cspan class=\"pl-c\"\u003e # register_consumer.go:15 -\u0026gt; *FeatureState\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eWhen \u003c/span\u003eI register another consumer named \u003cspan class=\"pl-s\"\u003e\"Able Anders\"\u003c/span\u003e\u003cspan class=\"pl-c\"\u003e # register_consumer.go:15 -\u0026gt; *FeatureState\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eThen \u003c/span\u003eI expect the command to succeed\u003cspan class=\"pl-c\"\u003e # feature_state.go:72 -\u0026gt; *FeatureState\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eIntegration Tests\u003c/h4\u003e\u003ca id=\"user-content-integration-tests\" class=\"anchor\" aria-label=\"Permalink: Integration Tests\" href=\"#integration-tests\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eTODO\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eUnit Tests\u003c/h4\u003e\u003ca id=\"user-content-unit-tests\" class=\"anchor\" aria-label=\"Permalink: Unit Tests\" href=\"#unit-tests\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eTODO\u003c/strong\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOther\u003c/h2\u003e\u003ca id=\"user-content-other\" class=\"anchor\" aria-label=\"Permalink: Other\" href=\"#other\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTracing\u003c/h3\u003e\u003ca id=\"user-content-tracing\" class=\"anchor\" aria-label=\"Permalink: Tracing\" href=\"#tracing\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNew requests into the system will be given value that is put into three containers \u003ccode\u003eRequestID\u003c/code\u003e, a \u003ccode\u003eCorrelationID\u003c/code\u003e, and\na \u003ccode\u003eCausationID\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAt each request boundary, -\u0026gt; HTTP, or -\u0026gt; GRPC, or -\u0026gt; Message, a new \u003ccode\u003eRequestID\u003c/code\u003e is generated, if a previous \u003ccode\u003eRequestID\u003c/code\u003e\nexists in the current context it is moved into the \u003ccode\u003eCausationID\u003c/code\u003e.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eAt each boundary a new \u003ccode\u003eRequestID\u003c/code\u003e is generated\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003eCausationID\u003c/code\u003e is set to the previous \u003ccode\u003eRequestID\u003c/code\u003e\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003eCorrelationID\u003c/code\u003e value remains the same into every new request that results from the original request.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eThese three values can be used to build a map of a request through the system.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe tracking and management of these IDs is a feature\nof \u003ca href=\"https://github.com/stackus/edat/blob/master/core/context.go\"\u003eedat\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMetrics/Instrumentation\u003c/h3\u003e\u003ca id=\"user-content-metricsinstrumentation\" class=\"anchor\" aria-label=\"Permalink: Metrics/Instrumentation\" href=\"#metricsinstrumentation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePrometheus metrics for each service are available at \u003ccode\u003ehttp://localhost:[port]/metrics\u003c/code\u003e. The order-service has a few\nadditional counters. See the order-service \u003ca href=\"/stackus/ftgogo/blob/master/order/cmd/service/main.go\"\u003ecode\u003c/a\u003e for more information.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMono-repository\u003c/h3\u003e\u003ca id=\"user-content-mono-repository\" class=\"anchor\" aria-label=\"Permalink: Mono-repository\" href=\"#mono-repository\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis demonstration application is a mono-repository for the Golang services. I chose to use as few additional frameworks\nas possible, so you'll find there is also quite a bit of shared code in packages under \u003ccode\u003e/shared-go\u003c/code\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eShared Code\u003c/h3\u003e\u003ca id=\"user-content-shared-code\" class=\"anchor\" aria-label=\"Permalink: Shared Code\" href=\"#shared-code\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003e/shared-go\u003c/code\u003e is named the way it is because I intended to build one of the services in another language. I didn't but\nleft the name the way it was.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis code exists simply to make it easier for me to build this demonstration. Applying DRY to microservices is a\n\u003ca href=\"https://www.devdelly.com/microservice-bad-smells/\" rel=\"nofollow\"\u003ecode-smell\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMonolith\u003c/h3\u003e\u003ca id=\"user-content-monolith\" class=\"anchor\" aria-label=\"Permalink: Monolith\" href=\"#monolith\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eStill a work-in-progress.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIndustry \u003ca href=\"https://betterprogramming.pub/monolith-first-270613e6396e\" rel=\"nofollow\"\u003eblogs\u003c/a\u003e\n, \u003ca href=\"https://www.amazon.com/Monolith-Microservices-Evolutionary-Patterns-Transform/dp/1492047848/\" rel=\"nofollow\"\u003ebooks\u003c/a\u003e,\nand \u003ca href=\"https://codeopinion.com/start-with-a-monolith-not-microservices/\" rel=\"nofollow\"\u003etalks\u003c/a\u003e typically all suggest applications start\nwith a monolith, single deployable application, before developing an application using microservices. Whether you have a\nlegacy monolith application or are starting a new application the last step before microservices is to refactor or\ndesign the monolith to be loosely-coupled.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe service capabilities can all be run together in a monolith to demonstrate what that might look like. It'll at beat\nrepresent the final form of a monolith that has been broken up by feature. This kind of monolith has several names.\nThe \"Majestic Monolith\", the \"Loosely-Coupled Monolith\", or the \"Modular Monolith\".\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eNote: The monolith came into existence after the development of the microservices. It may not give the best example of what a monolith might look like just before switching to microservices.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eType Registration\u003c/h3\u003e\u003ca id=\"user-content-type-registration\" class=\"anchor\" aria-label=\"Permalink: Type Registration\" href=\"#type-registration\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCommands, Events, Snapshots, and other serializable entities get registered in groups in\neach \u003ccode\u003e/\"domain\"/internal/domain/register_types.go\u003c/code\u003e and in the child packages of \u003ccode\u003eserviceapis\u003c/code\u003e. This type registration is\na feature of \u003ca href=\"https://github.com/stackus/edat/blob/master/core\"\u003eedat/core\u003c/a\u003e and is not unique to this application.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe purpose of doing this type registration is to avoid boilerplate marshalling and unmarshalling code for every struct.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eChanges from FTGO\u003c/h2\u003e\u003ca id=\"user-content-changes-from-ftgo\" class=\"anchor\" aria-label=\"Permalink: Changes from FTGO\" href=\"#changes-from-ftgo\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eI intend for this demonstration to exist as a faithful Golang recreation of the original. If a difference exists either\nbecause of opinion or is necessary due of the particulars of Go, I will try my best to include them all here.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eChanged\u003c/h3\u003e\u003ca id=\"user-content-changed\" class=\"anchor\" aria-label=\"Permalink: Changed\" href=\"#changed\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eI've kept most API requests and responses the same \"shape\" but routes are prefixed with \u003ccode\u003e/api\u003c/code\u003e and use \u003ccode\u003esnake_case\u003c/code\u003e\ninstead of \u003ccode\u003ecamelCase\u003c/code\u003e for property names.\u003c/li\u003e\n\u003cli\u003eIn FTGO many apis and messages that operated on Tickets used the OrderID as the TicketID. I could have done the same\nbut chose to let the Ticket aggregates use their own IDs. The TicketID was then included in responses and messages\nwhere it was needed.\u003c/li\u003e\n\u003cli\u003eOrder-History is not using DynamoDB. The purpose of Order-History is to provide a \"view\" or \"query\" service, and it\nshould demonstrate using infrastructure best suited for that purpose. For now, I'm using Postgres but intend to\nuse \u003ca href=\"https://www.elastic.co/what-is/elasticsearch\" rel=\"nofollow\"\u003eElasticsearch\u003c/a\u003e soon.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003eOrderService-\u0026gt;createOrder\u003c/code\u003e method I felt was doing too much.\nThe \u003ca href=\"/stackus/ftgogo/blob/master/order/internal/application/commands/create_order.go\"\u003ecommand\u003c/a\u003e\nimplementation creates the order like before, but the published entity event that results from that command is now the\ncatalyst for starting the CreateOrderSaga.\u003c/li\u003e\n\u003cli\u003eTo better demonstrate a \"Backend-For-Frontend\", orders take a consumers \u003ccode\u003eaddressId\u003c/code\u003e. Consumers will register one or\nmore addresses now. The \u003ca href=\"/stackus/ftgogo/blob/master/customer-web/internal/application/commands/create_order.go\"\u003ecustomer-web service\u003c/a\u003e uses data\nfrom another service to complete the modified CreateOrder command.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMissing\u003c/h3\u003e\u003ca id=\"user-content-missing\" class=\"anchor\" aria-label=\"Permalink: Missing\" href=\"#missing\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eTests. Examples of testing these services. Both Unit and Integration are still missing but executable specifications\nhave been added.\u003c/li\u003e\n\u003cli\u003e\u003cdel\u003eApi-Gateway. I haven't gotten around to creating the gateway.\u003c/del\u003e \"Backend-for-Frontend\"s have been added.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOut Of Scope\u003c/h2\u003e\u003ca id=\"user-content-out-of-scope\" class=\"anchor\" aria-label=\"Permalink: Out Of Scope\" href=\"#out-of-scope\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eJust like the original the following are outside the scope of the demonstration.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003cdel\u003eLogins \u0026amp; Authentication\u003c/del\u003e The \"Backend-for-Frontend\"s have implemented this in a very insecure way and only for\ndemonstration purposes.\u003c/li\u003e\n\u003cli\u003e\u003cdel\u003eAccounts \u0026amp; Authorization\u003c/del\u003e The \"Backend-for-Frontend\"s have implemented this in a very insecure way and only for\ndemonstration purposes.\u003c/li\u003e\n\u003cli\u003eAWS/Azure/GCP or any other cloud deployment instructions or scripts\u003c/li\u003e\n\u003cli\u003eTuning guidance\u003c/li\u003e\n\u003cli\u003eCI/CD guidance\u003c/li\u003e\n\u003cli\u003eChaos Testing - although feel free to terminate a service or cdc process for a bit and see if it breaks (it shouldn't)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eQuick Demo\u003c/h2\u003e\u003ca id=\"user-content-quick-demo\" class=\"anchor\" aria-label=\"Permalink: Quick Demo\" href=\"#quick-demo\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eDEPRECATED\u003c/strong\u003e\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eTODO: Rewrite. The instructions below no longer work with the changes made to the demo, primarily from the addition of the BFFs.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://www.postman.com/\" rel=\"nofollow\"\u003ePostman\u003c/a\u003e can be used to load the api collection for an easy demo.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWith the application running using one of the commands above you can make the following calls to see the processes,\nevents, and entities involved.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eRegister Consumer\u003c/li\u003e\n\u003cli\u003eSign In Consumer\u003c/li\u003e\n\u003cli\u003eAdd Consumer Address\u003c/li\u003e\n\u003cli\u003eCreate Order\u003c/li\u003e\n\u003cli\u003eConsumer Service: Register Consumer\u003c/li\u003e\n\u003cli\u003eRestaurant Service: Create Restaurant\u003c/li\u003e\n\u003cli\u003eOrder: Create Order\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eLoading \u003ccode\u003eFTGOGO.postman_collection.json\u003c/code\u003e into Postman will provide pre-built calls with semi-random data that can be\nused to test the above.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eContributing\u003c/h2\u003e\u003ca id=\"user-content-contributing\" class=\"anchor\" aria-label=\"Permalink: Contributing\" href=\"#contributing\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePlease make sure to update tests as appropriate.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eNo warranties\u003c/h2\u003e\u003ca id=\"user-content-no-warranties\" class=\"anchor\" aria-label=\"Permalink: No warranties\" href=\"#no-warranties\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFrom time to time I expect to make improvements that may be breaking. I provide no expectation that local copies of this\ndemonstration application won't be broken after fetching any new commit(s). If it does fail to run; simply remove the\nrelated docker volumes and re-run the demonstration.\u003c/p\u003e\n\u003c/article\u003e","loaded":true,"timedOut":false,"errorMessage":null,"headerInfo":{"toc":[{"level":1,"text":"ftgogo - event-driven architecture demonstration application","anchor":"ftgogo---event-driven-architecture-demonstration-application","htmlText":"ftgogo - event-driven architecture demonstration application"},{"level":2,"text":"Introduction","anchor":"introduction","htmlText":"Introduction"},{"level":2,"text":"Purpose","anchor":"purpose","htmlText":"Purpose"},{"level":3,"text":"What you'll find in this demonstration","anchor":"what-youll-find-in-this-demonstration","htmlText":"What you'll find in this demonstration"},{"level":2,"text":"Prerequisites","anchor":"prerequisites","htmlText":"Prerequisites"},{"level":2,"text":"Execution","anchor":"execution","htmlText":"Execution"},{"level":3,"text":"Mac, Linux, and Windows Users","anchor":"mac-linux-and-windows-users","htmlText":"Mac, Linux, and Windows Users"},{"level":3,"text":"Running individual services","anchor":"running-individual-services","htmlText":"Running individual services"},{"level":2,"text":"Architecture","anchor":"architecture","htmlText":"Architecture"},{"level":3,"text":"Clean Architecture","anchor":"clean-architecture","htmlText":"Clean Architecture"},{"level":3,"text":"Code Layout","anchor":"code-layout","htmlText":"Code Layout"},{"level":4,"text":"Regarding the layout","anchor":"regarding-the-layout","htmlText":"Regarding the layout"},{"level":3,"text":"Services","anchor":"services","htmlText":"Services"},{"level":4,"text":"Downstream Services","anchor":"downstream-services","htmlText":"Downstream Services"},{"level":4,"text":"CDC Services","anchor":"cdc-services","htmlText":"CDC Services"},{"level":4,"text":"Backend-For-Frontend Services","anchor":"backend-for-frontend-services","htmlText":"Backend-For-Frontend Services"},{"level":2,"text":"Design","anchor":"design","htmlText":"Design"},{"level":3,"text":"Event-Driven Architecture","anchor":"event-driven-architecture","htmlText":"Event-Driven Architecture"},{"level":4,"text":"Sagas","anchor":"sagas","htmlText":"Sagas"},{"level":4,"text":"Outbox Pattern","anchor":"outbox-pattern","htmlText":"Outbox Pattern"},{"level":4,"text":"Message Deduplication","anchor":"message-deduplication","htmlText":"Message Deduplication"},{"level":3,"text":"CQRS","anchor":"cqrs","htmlText":"CQRS"},{"level":3,"text":"Event Sourcing","anchor":"event-sourcing","htmlText":"Event Sourcing"},{"level":3,"text":"Backend-For-Frontend (BFF)","anchor":"backend-for-frontend-bff","htmlText":"Backend-For-Frontend (BFF)"},{"level":3,"text":"GRPC and Protocol Buffers","anchor":"grpc-and-protocol-buffers","htmlText":"GRPC and Protocol Buffers"},{"level":3,"text":"Testing","anchor":"testing","htmlText":"Testing"},{"level":4,"text":"Specifications / Acceptance Tests","anchor":"specifications--acceptance-tests","htmlText":"Specifications / Acceptance Tests"},{"level":4,"text":"Integration Tests","anchor":"integration-tests","htmlText":"Integration Tests"},{"level":4,"text":"Unit Tests","anchor":"unit-tests","htmlText":"Unit Tests"},{"level":2,"text":"Other","anchor":"other","htmlText":"Other"},{"level":3,"text":"Tracing","anchor":"tracing","htmlText":"Tracing"},{"level":3,"text":"Metrics/Instrumentation","anchor":"metricsinstrumentation","htmlText":"Metrics/Instrumentation"},{"level":3,"text":"Mono-repository","anchor":"mono-repository","htmlText":"Mono-repository"},{"level":3,"text":"Shared Code","anchor":"shared-code","htmlText":"Shared Code"},{"level":3,"text":"Monolith","anchor":"monolith","htmlText":"Monolith"},{"level":3,"text":"Type Registration","anchor":"type-registration","htmlText":"Type Registration"},{"level":2,"text":"Changes from FTGO","anchor":"changes-from-ftgo","htmlText":"Changes from FTGO"},{"level":3,"text":"Changed","anchor":"changed","htmlText":"Changed"},{"level":3,"text":"Missing","anchor":"missing","htmlText":"Missing"},{"level":2,"text":"Out Of Scope","anchor":"out-of-scope","htmlText":"Out Of Scope"},{"level":2,"text":"Quick Demo","anchor":"quick-demo","htmlText":"Quick Demo"},{"level":2,"text":"Contributing","anchor":"contributing","htmlText":"Contributing"},{"level":2,"text":"No warranties","anchor":"no-warranties","htmlText":"No 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data-testid="path-name-segment">config/</span><span class="" data-testid="path-name-segment">postgresql</span></a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row undefined" id="folder-row-2"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="consumer" aria-label="consumer, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/consumer">consumer</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="consumer" aria-label="consumer, (Directory)" class="Link--primary" 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aria-label="customer-web, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/customer-web">customer-web</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="customer-web" aria-label="customer-web, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/customer-web">customer-web</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row undefined" id="folder-row-4"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="delivery" aria-label="delivery, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/delivery">delivery</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="delivery" aria-label="delivery, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/delivery">delivery</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row undefined" id="folder-row-5"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="This path skips through empty directories" aria-label="deployment/kubernetes, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/deployment/kubernetes"><span class="react-directory-default-color" data-testid="path-name-segment">deployment/</span><span class="" data-testid="path-name-segment">kubernetes</span></a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="This path skips through empty directories" aria-label="deployment/kubernetes, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/deployment/kubernetes"><span class="react-directory-default-color" data-testid="path-name-segment">deployment/</span><span class="" data-testid="path-name-segment">kubernetes</span></a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row undefined" id="folder-row-6"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 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class="Link--primary" href="/stackus/ftgogo/tree/master/docs">docs</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row undefined" id="folder-row-7"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="kitchen" aria-label="kitchen, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/kitchen">kitchen</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="kitchen" aria-label="kitchen, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/kitchen">kitchen</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row undefined" id="folder-row-8"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="monolith" aria-label="monolith, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/monolith">monolith</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="monolith" aria-label="monolith, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/monolith">monolith</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row undefined" id="folder-row-9"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="order-history" aria-label="order-history, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/order-history">order-history</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="order-history" aria-label="order-history, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/order-history">order-history</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row truncate-for-mobile" id="folder-row-10"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="order" aria-label="order, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/order">order</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="order" aria-label="order, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/order">order</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row truncate-for-mobile" id="folder-row-11"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="restaurant" aria-label="restaurant, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/restaurant">restaurant</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="restaurant" aria-label="restaurant, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/restaurant">restaurant</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row truncate-for-mobile" id="folder-row-12"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="serviceapis" aria-label="serviceapis, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/serviceapis">serviceapis</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="serviceapis" aria-label="serviceapis, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/serviceapis">serviceapis</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row truncate-for-mobile" id="folder-row-13"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="shared-go" aria-label="shared-go, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/shared-go">shared-go</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="shared-go" aria-label="shared-go, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/shared-go">shared-go</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row truncate-for-mobile" id="folder-row-14"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="store-web" aria-label="store-web, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/store-web">store-web</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file-directory-fill icon-directory" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M1.75 1A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25v-8.5A1.75 1.75 0 0 0 14.25 3H7.5a.25.25 0 0 1-.2-.1l-.9-1.2C6.07 1.26 5.55 1 5 1H1.75Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title="store-web" aria-label="store-web, (Directory)" class="Link--primary" href="/stackus/ftgogo/tree/master/store-web">store-web</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row truncate-for-mobile" id="folder-row-15"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file color-fg-muted" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M2 1.75C2 .784 2.784 0 3.75 0h6.586c.464 0 .909.184 1.237.513l2.914 2.914c.329.328.513.773.513 1.237v9.586A1.75 1.75 0 0 1 13.25 16h-9.5A1.75 1.75 0 0 1 2 14.25Zm1.75-.25a.25.25 0 0 0-.25.25v12.5c0 .138.112.25.25.25h9.5a.25.25 0 0 0 .25-.25V6h-2.75A1.75 1.75 0 0 1 9 4.25V1.5Zm6.75.062V4.25c0 .138.112.25.25.25h2.688l-.011-.013-2.914-2.914-.013-.011Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title=".dockerignore" aria-label=".dockerignore, (File)" class="Link--primary" href="/stackus/ftgogo/blob/master/.dockerignore">.dockerignore</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file color-fg-muted" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M2 1.75C2 .784 2.784 0 3.75 0h6.586c.464 0 .909.184 1.237.513l2.914 2.914c.329.328.513.773.513 1.237v9.586A1.75 1.75 0 0 1 13.25 16h-9.5A1.75 1.75 0 0 1 2 14.25Zm1.75-.25a.25.25 0 0 0-.25.25v12.5c0 .138.112.25.25.25h9.5a.25.25 0 0 0 .25-.25V6h-2.75A1.75 1.75 0 0 1 9 4.25V1.5Zm6.75.062V4.25c0 .138.112.25.25.25h2.688l-.011-.013-2.914-2.914-.013-.011Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title=".dockerignore" aria-label=".dockerignore, (File)" class="Link--primary" href="/stackus/ftgogo/blob/master/.dockerignore">.dockerignore</a></div></div></div></div></td><td class="react-directory-row-commit-cell"><div class="Skeleton Skeleton--text"> </div></td><td><div class="Skeleton Skeleton--text"> </div></td></tr><tr class="react-directory-row truncate-for-mobile" id="folder-row-16"><td class="react-directory-row-name-cell-small-screen" colSpan="2"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file color-fg-muted" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M2 1.75C2 .784 2.784 0 3.75 0h6.586c.464 0 .909.184 1.237.513l2.914 2.914c.329.328.513.773.513 1.237v9.586A1.75 1.75 0 0 1 13.25 16h-9.5A1.75 1.75 0 0 1 2 14.25Zm1.75-.25a.25.25 0 0 0-.25.25v12.5c0 .138.112.25.25.25h9.5a.25.25 0 0 0 .25-.25V6h-2.75A1.75 1.75 0 0 1 9 4.25V1.5Zm6.75.062V4.25c0 .138.112.25.25.25h2.688l-.011-.013-2.914-2.914-.013-.011Z"></path></svg><div class="overflow-hidden"><div class="react-directory-filename-cell"><div class="react-directory-truncate"><a title=".editorconfig" aria-label=".editorconfig, (File)" class="Link--primary" href="/stackus/ftgogo/blob/master/.editorconfig">.editorconfig</a></div></div></div></div></td><td class="react-directory-row-name-cell-large-screen" colSpan="1"><div class="react-directory-filename-column"><svg aria-hidden="true" focusable="false" class="octicon octicon-file color-fg-muted" viewBox="0 0 16 16" width="16" height="16" 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style="vertical-align:text-bottom"><path d="M5.75 2.5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5Zm0 5h8.5a.75.75 0 0 1 0 1.5h-8.5a.75.75 0 0 1 0-1.5ZM2 14a1 1 0 1 1 0-2 1 1 0 0 1 0 2Zm1-6a1 1 0 1 1-2 0 1 1 0 0 1 2 0ZM2 4a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg></button></div><div class="Box-sc-g0xbh4-0 QkQOb js-snippet-clipboard-copy-unpositioned undefined" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">ftgogo - event-driven architecture demonstration application</h1><a id="user-content-ftgogo---event-driven-architecture-demonstration-application" class="anchor" aria-label="Permalink: ftgogo - event-driven architecture demonstration application" href="#ftgogo---event-driven-architecture-demonstration-application"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Introduction</h2><a id="user-content-introduction" class="anchor" aria-label="Permalink: Introduction" href="#introduction"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">ftgogo (food-to-gogo) is a Golang implementation of the <a href="https://github.com/microservices-patterns/ftgo-application">FTGO</a> application described in the book <a href="https://www.manning.com/books/microservices-patterns" rel="nofollow">"Microservice Patterns"</a> by Chris Richardson. A library <a href="https://github.com/stackus/edat">edat</a> was developed to provide for Golang many of the solutions that <a href="https://eventuate.io/" rel="nofollow">Eventuate</a>, the framework used by FTGO, provides for Java.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Purpose</h2><a id="user-content-purpose" class="anchor" aria-label="Permalink: Purpose" href="#purpose"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This repository exists to demonstrate the patterns and processes involved when constructing a distributed application using <a href="https://en.wikipedia.org/wiki/Event-driven_architecture" rel="nofollow">event-driven architecture</a>.</p> <p dir="auto">This repository started as a Golang clone of the FTGO demonstration application but as time goes on it will grow to demonstrate additional microservice patterns and techniques.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">What you'll find in this demonstration</h3><a id="user-content-what-youll-find-in-this-demonstration" class="anchor" aria-label="Permalink: What you'll find in this demonstration" href="#what-youll-find-in-this-demonstration"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ol dir="auto"> <li><a href="#architecture">Architecture</a> <ol dir="auto"> <li><a href="#clean-architecture">Clean Architecture</a></li> <li><a href="#code-layout">Code Layout</a></li> <li><a href="#services">Services</a></li> </ol> </li> <li><a href="#design">Design</a> <ol dir="auto"> <li><a href="#event-driven-architecture">Event-Driven Architecture</a> <ol dir="auto"> <li><a href="#sagas">Sagas</a></li> <li><a href="#outbox-pattern">Outbox Pattern</a></li> <li><a href="#message-deduplication">Message Deduplication</a></li> </ol> </li> <li><a href="#cqrs">CQRS</a></li> <li><a href="#event-sourcing">Event Sourcing</a></li> <li><a href="#backend-for-frontend-bff">Backend-For-Frontend</a></li> <li><a href="#grpc-and-protocol-buffers">GRPC and Protocol Buffers</a></li> <li><a href="#testing">Testing</a> <ol dir="auto"> <li><a href="#specifications--acceptance-tests">Specifications / Acceptance Tests</a></li> <li><a href="#integration-tests">Integration Tests</a></li> <li><a href="#unit-tests">Unit Tests</a></li> </ol> </li> </ol> </li> <li><a href="#other">Other</a> <ol dir="auto"> <li><a href="#tracing">Tracing</a></li> <li><a href="#metricsinstrumentation">Metrics/Instrumentation</a></li> <li><a href="#mono-repository">Mono-repository</a></li> <li><a href="#shared-code">Shared code</a></li> <li><a href="#monolith">Monolith</a></li> <li><a href="#type-registration">Type Registration</a></li> </ol> </li> <li><a href="#changes-from-ftgo">Changes from FTGO</a></li> </ol> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Prerequisites</h2><a id="user-content-prerequisites" class="anchor" aria-label="Permalink: Prerequisites" href="#prerequisites"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a href="https://www.docker.com/" rel="nofollow">Docker</a> - Everything is built and run from a docker compose environment.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Execution</h2><a id="user-content-execution" class="anchor" aria-label="Permalink: Execution" href="#execution"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Open a command prompt and then execute the following docker command</p> <blockquote> <p dir="auto">NOTE: The first time you bring everything up the init script for Postgres will run automatically. The services will crash-loop for a bit because of that. Eventually things will stabilize.</p> </blockquote> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Mac, Linux, and Windows Users</h3><a id="user-content-mac-linux-and-windows-users" class="anchor" aria-label="Permalink: Mac, Linux, and Windows Users" href="#mac-linux-and-windows-users"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="docker-compose up"><pre>docker-compose up</pre></div> <p dir="auto">Use <code>Ctrl-C</code> to stop all services.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Running individual services</h3><a id="user-content-running-individual-services" class="anchor" aria-label="Permalink: Running individual services" href="#running-individual-services"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Not recommended but each service can be run using <code>go run .</code>. You'll need to use an <code>.env</code> file or set some environment variables to properly run the service.</p> <blockquote> <p dir="auto">Use <code>go run . --help</code> to see all the flags and environment variables that can be set.</p> </blockquote> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Architecture</h2><a id="user-content-architecture" class="anchor" aria-label="Permalink: Architecture" href="#architecture"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Clean Architecture</h3><a id="user-content-clean-architecture" class="anchor" aria-label="Permalink: Clean Architecture" href="#clean-architecture"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a target="_blank" rel="noopener noreferrer" href="/stackus/ftgogo/blob/master/docs/hexagonal_architecture_w.png"><img src="/stackus/ftgogo/raw/master/docs/hexagonal_architecture_w.png" alt="Hexagonal Architecture Diagram" style="max-width: 100%;"></a></p> <blockquote> <p dir="auto">The colors used for each component in the above diagram align with the ring colors used in clean architecture diagram.</p> </blockquote> <p dir="auto">In this implementation of <a href="https://blog.cleancoder.com/uncle-bob/2012/08/13/the-clean-architecture.html" rel="nofollow">clean architecture</a> I am working mainly with <a href="https://jmgarridopaz.github.io/content/hexagonalarchitecture.html" rel="nofollow">Hexagonal Architecture</a> or Ports & Adapters terms from those methodologies.</p> <ul dir="auto"> <li>Primary Adapters (Driver Adapters) <ul dir="auto"> <li>Adapter implementations are in <code>/internal/handlers</code></li> <li>Port interfaces are in <code>/internal/application/service.go</code></li> <li>Primary Adapters <strong>USE</strong> the interface the application <strong>IMPLEMENTS</strong></li> </ul> </li> <li>Secondary Adapters (Driven Adapters) <ul dir="auto"> <li>Adapter implementations are in <code>/internal/adapters</code></li> <li>Port interfaces are in <code>/internal/application/ports</code></li> <li>Secondary Adapters <strong>IMPLEMENT</strong> the interface the application <strong>USES</strong></li> </ul> </li> </ul> <p dir="auto">Bringing the interfaces and implementations together looks about the same for all services. Below is an example from the <a href="/stackus/ftgogo/blob/master/consumer/cmd/service/main.go">Consumer Service</a>.</p> <div class="highlight highlight-source-go notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="package main import ( "github.com/stackus/ftgogo/consumer/internal/adapters" "github.com/stackus/ftgogo/consumer/internal/application" "github.com/stackus/ftgogo/consumer/internal/domain" "github.com/stackus/ftgogo/consumer/internal/handlers" "github.com/stackus/ftgogo/serviceapis" "shared-go/applications" ) func main() { svc := applications.NewService(initService) if err := svc.Execute(); err != nil { panic(err) } } func initService(svc *applications.Service) error { serviceapis.RegisterTypes() domain.RegisterTypes() // Driven consumerRepo := adapters.NewConsumerRepositoryPublisherMiddleware( adapters.NewConsumerAggregateRepository(svc.AggregateStore), adapters.NewConsumerEntityEventPublisher(svc.Publisher), ) app := application.NewServiceApplication(consumerRepo) // Drivers handlers.NewCommandHandlers(app).Mount(svc.Subscriber, svc.Publisher) handlers.NewRpcHandlers(app).Mount(svc.RpcServer) return nil }"><pre><span class="pl-k">package</span> main <span class="pl-k">import</span> ( <span class="pl-s">"github.com/stackus/ftgogo/consumer/internal/adapters"</span> <span class="pl-s">"github.com/stackus/ftgogo/consumer/internal/application"</span> <span class="pl-s">"github.com/stackus/ftgogo/consumer/internal/domain"</span> <span class="pl-s">"github.com/stackus/ftgogo/consumer/internal/handlers"</span> <span class="pl-s">"github.com/stackus/ftgogo/serviceapis"</span> <span class="pl-s">"shared-go/applications"</span> ) <span class="pl-k">func</span> <span class="pl-s1">main</span>() { <span class="pl-s1">svc</span> <span class="pl-c1">:=</span> <span class="pl-s1">applications</span>.<span class="pl-c1">NewService</span>(<span class="pl-s1">initService</span>) <span class="pl-k">if</span> <span class="pl-s1">err</span> <span class="pl-c1">:=</span> <span class="pl-s1">svc</span>.<span class="pl-c1">Execute</span>(); <span class="pl-s1">err</span> <span class="pl-c1">!=</span> <span class="pl-c1">nil</span> { <span class="pl-s1">panic</span>(<span class="pl-s1">err</span>) } } <span class="pl-k">func</span> <span class="pl-s1">initService</span>(<span class="pl-s1">svc</span> <span class="pl-c1">*</span>applications.<span class="pl-smi">Service</span>) <span class="pl-smi">error</span> { <span class="pl-s1">serviceapis</span>.<span class="pl-c1">RegisterTypes</span>() <span class="pl-s1">domain</span>.<span class="pl-c1">RegisterTypes</span>() <span class="pl-c">// Driven</span> <span class="pl-s1">consumerRepo</span> <span class="pl-c1">:=</span> <span class="pl-s1">adapters</span>.<span class="pl-c1">NewConsumerRepositoryPublisherMiddleware</span>( <span class="pl-s1">adapters</span>.<span class="pl-c1">NewConsumerAggregateRepository</span>(<span class="pl-s1">svc</span>.<span class="pl-c1">AggregateStore</span>), <span class="pl-s1">adapters</span>.<span class="pl-c1">NewConsumerEntityEventPublisher</span>(<span class="pl-s1">svc</span>.<span class="pl-c1">Publisher</span>), ) <span class="pl-s1">app</span> <span class="pl-c1">:=</span> <span class="pl-s1">application</span>.<span class="pl-c1">NewServiceApplication</span>(<span class="pl-s1">consumerRepo</span>) <span class="pl-c">// Drivers</span> <span class="pl-s1">handlers</span>.<span class="pl-c1">NewCommandHandlers</span>(<span class="pl-s1">app</span>).<span class="pl-c1">Mount</span>(<span class="pl-s1">svc</span>.<span class="pl-c1">Subscriber</span>, <span class="pl-s1">svc</span>.<span class="pl-c1">Publisher</span>) <span class="pl-s1">handlers</span>.<span class="pl-c1">NewRpcHandlers</span>(<span class="pl-s1">app</span>).<span class="pl-c1">Mount</span>(<span class="pl-s1">svc</span>.<span class="pl-c1">RpcServer</span>) <span class="pl-k">return</span> <span class="pl-c1">nil</span> }</pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Code Layout</h3><a id="user-content-code-layout" class="anchor" aria-label="Permalink: Code Layout" href="#code-layout"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>Services exist within a capability or domain folder. Within that folder you'll find the following layout. <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="/"domain" - A capability or domain that is a subdomain in the larger application domain |-/cmd - Parent for servers, cli, and tools that are built using the code in this domain | |-/cdc - CDC (Change Data Capture) server. If the service publishes messages it will also have this | |-/service - Primary service for this capability |-/internal - Use the special treatment of "internal" to sequester our code from the other services |-/adapters - Driven Adapter implementations. |-/application - Application core folder. Processes under this will implement business rules and logic | |-/commands - CQRS commands. Processes that apply some change to the subdomain | |-/ports - Application interfaces that the Driven Adapters implement. | |-/queries - CQRS queries. Processes that request information from the subdomain | |-service.go - Application interface and implementation that is used by the handlers, the Driver Adapters. |-/domain - The definitions and the domain rules and logic |-/handlers - Driver Adapter implementations"><pre lang="text" class="notranslate"><code>/"domain" - A capability or domain that is a subdomain in the larger application domain |-/cmd - Parent for servers, cli, and tools that are built using the code in this domain | |-/cdc - CDC (Change Data Capture) server. If the service publishes messages it will also have this | |-/service - Primary service for this capability |-/internal - Use the special treatment of "internal" to sequester our code from the other services |-/adapters - Driven Adapter implementations. |-/application - Application core folder. Processes under this will implement business rules and logic | |-/commands - CQRS commands. Processes that apply some change to the subdomain | |-/ports - Application interfaces that the Driven Adapters implement. | |-/queries - CQRS queries. Processes that request information from the subdomain | |-service.go - Application interface and implementation that is used by the handlers, the Driver Adapters. |-/domain - The definitions and the domain rules and logic |-/handlers - Driver Adapter implementations </code></pre></div> </li> </ul> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Regarding the layout</h4><a id="user-content-regarding-the-layout" class="anchor" aria-label="Permalink: Regarding the layout" href="#regarding-the-layout"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This layout is an example of organizing code to achieve clean architecture. You do not need to use this layout to have implemented clean architecture with Go. I've made and am likely to make more minor adjustments to this layout and do not consider it perfect or the "one".</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Services</h3><a id="user-content-services" class="anchor" aria-label="Permalink: Services" href="#services"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a target="_blank" rel="noopener noreferrer" href="/stackus/ftgogo/blob/master/docs/architecture.png"><img src="/stackus/ftgogo/raw/master/docs/architecture.png" alt="FTGOGO Architecture" style="max-width: 100%;"></a></p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Downstream Services</h4><a id="user-content-downstream-services" class="anchor" aria-label="Permalink: Downstream Services" href="#downstream-services"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="/stackus/ftgogo/blob/master/accounting/cmd/service">accounting-service</a> - the <code>Accounting Service</code></li> <li><a href="/stackus/ftgogo/blob/master/consumer/cmd/service">consumer-service</a> - the <code>Consumer Service</code></li> <li><a href="/stackus/ftgogo/blob/master/delivery/cmd/service">delivery-service</a> - the <code>Delivery Service</code></li> <li><a href="/stackus/ftgogo/blob/master/kitchen/cmd/service">kitchen-service</a> - the <code>Kitchen Service</code></li> <li><a href="/stackus/ftgogo/blob/master/order/cmd/service">order-service</a> - the <code>Order Service</code></li> <li><a href="/stackus/ftgogo/blob/master/order-history/cmd/service">order-history-service</a> - the <code>Order History Service</code></li> <li><a href="/stackus/ftgogo/blob/master/restaurant/cmd/service">restaurant-service</a> the <code>Restaurant Service</code></li> </ul> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">CDC Services</h4><a id="user-content-cdc-services" class="anchor" aria-label="Permalink: CDC Services" href="#cdc-services"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="/stackus/ftgogo/blob/master/accounting/cmd/cdc">accounting-cdc</a> - the <code>Accounting CDC Service</code></li> <li><a href="/stackus/ftgogo/blob/master/consumer/cmd/cdc">consumer-cdc</a> - the <code>Consumer CDC Service</code></li> <li><a href="/stackus/ftgogo/blob/master/kitchen/cmd/cdc">kitchen-cdc</a> - the <code>Kitchen CDC Service</code></li> <li><a href="/stackus/ftgogo/blob/master/order/cmd/cdc">order-cdc</a> - the <code>Order CDC Service</code></li> <li><a href="/stackus/ftgogo/blob/master/restaurant/cmd/cdc">restaurant-cdc</a> the <code>Restaurant CDC Service</code></li> </ul> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Backend-For-Frontend Services</h4><a id="user-content-backend-for-frontend-services" class="anchor" aria-label="Permalink: Backend-For-Frontend Services" href="#backend-for-frontend-services"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="/stackus/ftgogo/blob/master/customer-web/cmd/gateway">customer-web</a> - the <code>Customer Web Gateway Service</code></li> <li><a href="/stackus/ftgogo/blob/master/store-web/cmd/gateway">store-web</a> - the <code>Store Web Gateway Service</code></li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Design</h2><a id="user-content-design" class="anchor" aria-label="Permalink: Design" href="#design"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Event-Driven Architecture</h3><a id="user-content-event-driven-architecture" class="anchor" aria-label="Permalink: Event-Driven Architecture" href="#event-driven-architecture"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Asynchronous messaging handles all inter-service communication. The exception is the communication from the BFF/UI layer to the downstream services.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Sagas</h4><a id="user-content-sagas" class="anchor" aria-label="Permalink: Sagas" href="#sagas"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The same three sagas found in <a href="https://github.com/microservices-patterns/ftgo-application">FTGO</a> have been implemented here in the <a href="/stackus/ftgogo/blob/master/order/cmd/service">order-service</a>.</p> <ul dir="auto"> <li><a href="/stackus/ftgogo/blob/master/order/internal/adapters/create_order_orchestration_saga.go">CreateOrderSaga</a> <ul dir="auto"> <li>saga responsible for the creation of a new order<br> <a target="_blank" rel="noopener noreferrer" href="/stackus/ftgogo/blob/master/docs/createOrderSaga.png"><img src="/stackus/ftgogo/raw/master/docs/createOrderSaga.png" alt="Steps" style="max-width: 100%;"></a></li> </ul> </li> <li><a href="/stackus/ftgogo/blob/master/order/internal/adapters/cancel_order_orchestration_saga.go">CancelOrderSaga</a> <ul dir="auto"> <li>saga responsible for the cancelling and releasing of order resources like tickets and accounting reserves<br> <a target="_blank" rel="noopener noreferrer" href="/stackus/ftgogo/blob/master/docs/cancelOrderSaga.png"><img src="/stackus/ftgogo/raw/master/docs/cancelOrderSaga.png" alt="Steps" style="max-width: 100%;"></a></li> </ul> </li> <li><a href="/stackus/ftgogo/blob/master/order/internal/adapters/revise_order_orchestration_saga.go">ReviseOrderSaga</a> <ul dir="auto"> <li>saga responsible for the processing the changes made to an open order<br> <a target="_blank" rel="noopener noreferrer" href="/stackus/ftgogo/blob/master/docs/reviseOrderSaga.png"><img src="/stackus/ftgogo/raw/master/docs/reviseOrderSaga.png" alt="Steps" style="max-width: 100%;"></a></li> </ul> </li> </ul> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Outbox Pattern</h4><a id="user-content-outbox-pattern" class="anchor" aria-label="Permalink: Outbox Pattern" href="#outbox-pattern"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">An implementation of the <a href="http://www.kamilgrzybek.com/design/the-outbox-pattern/" rel="nofollow">outbox pattern</a> can be used to ensure all messages arrive at their destinations. It provides the solution to the <a href="https://thorben-janssen.com/dual-writes/" rel="nofollow">dual write problem</a>. Any service that publishes messages is actually publishing the message into the database. A CDC sibling service then processes the messages from the database and publishes the message into NATS Streaming. This process provides at-least-once delivery.</p> <p dir="auto"><a target="_blank" rel="noopener noreferrer" href="/stackus/ftgogo/blob/master/docs/outbox_pattern_bg.png"><img src="/stackus/ftgogo/raw/master/docs/outbox_pattern_bg.png" alt="Outbox Pattern Diagram" style="max-width: 100%;"></a></p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Message Deduplication</h4><a id="user-content-message-deduplication" class="anchor" aria-label="Permalink: Message Deduplication" href="#message-deduplication"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><strong>TODO</strong></p> <p dir="auto">This will be a new feature added to the <a href="https://github.com/stackus/edat">edat</a> library.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">CQRS</h3><a id="user-content-cqrs" class="anchor" aria-label="Permalink: CQRS" href="#cqrs"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Each service divides the requests it receives into commands and queries. Using a simple design described <a href="https://threedots.tech/post/basic-cqrs-in-go/" rel="nofollow">here</a> by <a href="https://threedotslabs.com/" rel="nofollow">Three Dots Labs</a> all of our handlers can be setup to use a command or query.</p> <p dir="auto">This is a very limited in scope implementation of <a href="https://docs.microsoft.com/en-us/azure/architecture/patterns/cqrs" rel="nofollow">CQRS</a>. It is valid in that we have two things where before we had one. Command and query have been segregated to separate responsibilities.</p> <p dir="auto">The <a href="/stackus/ftgogo/blob/master/order-history">Order History</a> Service provides an order by consumer read-model.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Event Sourcing</h3><a id="user-content-event-sourcing" class="anchor" aria-label="Permalink: Event Sourcing" href="#event-sourcing"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Several services use event sourcing and keep track of the changes to aggregates using commands and recorded events. Check out the <a href="/stackus/ftgogo/blob/master/order/internal/domain/order.go">Order</a> aggregate for an example.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Backend-For-Frontend (BFF)</h3><a id="user-content-backend-for-frontend-bff" class="anchor" aria-label="Permalink: Backend-For-Frontend (BFF)" href="#backend-for-frontend-bff"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The project now demonstrates the <a href="https://samnewman.io/patterns/architectural/bff/" rel="nofollow">backend-for-frontend</a> pattern with the addition of a Customer-Web service. These types of services are purpose built API Gateways that serve a specific client experience.</p> <p dir="auto">The addition of these BFFs also provide a place to implement cross-cutting concerns such as authorization and authentication. I've tried to add demonstrations of the capabilities of what a BFF might do for a microservices application.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">GRPC and Protocol Buffers</h3><a id="user-content-grpc-and-protocol-buffers" class="anchor" aria-label="Permalink: GRPC and Protocol Buffers" href="#grpc-and-protocol-buffers"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">With the addition of the first BFF, GRPC is now used in place of HTTP by the handlers. GRPC is a subjectively <a href="https://cloud.google.com/blog/products/api-management/understanding-grpc-openapi-and-rest-and-when-to-use-them" rel="nofollow">better</a> choice for communication between your applications Api Gateway or BFF than using HTTP with REST. The move to GRPC was done leaving the contracts previously used by HTTP endpoints unchanged as much as possible.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Testing</h3><a id="user-content-testing" class="anchor" aria-label="Permalink: Testing" href="#testing"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Specifications / Acceptance Tests</h4><a id="user-content-specifications--acceptance-tests" class="anchor" aria-label="Permalink: Specifications / Acceptance Tests" href="#specifications--acceptance-tests"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Executable specifications written in Gherkin have been added to most services. You can find these in the <code>/features</code> directories.</p> <p dir="auto">These specifications can be executed using the <a href="https://github.com/cucumber/godog">godog</a> Cucumber tool. The Makefile target <code>run-feature-tests</code> can be used to run all the specifications across all services. Below is an example output from running the <a href="/stackus/ftgogo/blob/master/consumer/features/register_consumer.feature">Consumer Registration</a> specification.</p> <div class="highlight highlight-text-gherkin-feature notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="Feature: Register Consumer Scenario: Consumers can be registered # features\register_consumer.feature:4 When I register a consumer named "Able Anders" # register_consumer.go:15 -> *FeatureState Then I expect the command to succeed # feature_state.go:72 -> *FeatureState Scenario: Consumers must be registered with a name # features\register_consumer.feature:8 When I register a consumer named "" # register_consumer.go:15 -> *FeatureState Then I expect the command to fail # feature_state.go:64 -> *FeatureState And the returned error message is "cannot register a consumer without a name" # feature_state.go:80 -> *FeatureState Scenario: Duplicate consumer names do not cause conflicts # features\register_consumer.feature:13 Given I register a consumer named "Able Anders" # register_consumer.go:15 -> *FeatureState When I register another consumer named "Able Anders" # register_consumer.go:15 -> *FeatureState Then I expect the command to succeed # feature_state.go:72 -> *FeatureState"><pre><span class="pl-k">Feature</span>:<span class="pl-s"> Register Consumer</span> <span class="pl-k">Scenario</span>:<span class="pl-s"> Consumers can be registered # features\register_consumer.feature:4</span> <span class="pl-k">When </span>I register a consumer named <span class="pl-s">"Able Anders"</span><span class="pl-c"> # register_consumer.go:15 -> *FeatureState</span> <span class="pl-k">Then </span>I expect the command to succeed<span class="pl-c"> # feature_state.go:72 -> *FeatureState</span> <span class="pl-k">Scenario</span>:<span class="pl-s"> Consumers must be registered with a name # features\register_consumer.feature:8</span> <span class="pl-k">When </span>I register a consumer named <span class="pl-s">""</span><span class="pl-c"> # register_consumer.go:15 -> *FeatureState</span> <span class="pl-k">Then </span>I expect the command to fail<span class="pl-c"> # feature_state.go:64 -> *FeatureState</span> <span class="pl-k">And </span>the returned error message is <span class="pl-s">"cannot register a consumer without a name"</span><span class="pl-c"> # feature_state.go:80 -> *FeatureState</span> <span class="pl-k">Scenario</span>:<span class="pl-s"> Duplicate consumer names do not cause conflicts # features\register_consumer.feature:13</span> <span class="pl-k">Given </span>I register a consumer named <span class="pl-s">"Able Anders"</span><span class="pl-c"> # register_consumer.go:15 -> *FeatureState</span> <span class="pl-k">When </span>I register another consumer named <span class="pl-s">"Able Anders"</span><span class="pl-c"> # register_consumer.go:15 -> *FeatureState</span> <span class="pl-k">Then </span>I expect the command to succeed<span class="pl-c"> # feature_state.go:72 -> *FeatureState</span></pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Integration Tests</h4><a id="user-content-integration-tests" class="anchor" aria-label="Permalink: Integration Tests" href="#integration-tests"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><strong>TODO</strong></p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Unit Tests</h4><a id="user-content-unit-tests" class="anchor" aria-label="Permalink: Unit Tests" href="#unit-tests"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><strong>TODO</strong></p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Other</h2><a id="user-content-other" class="anchor" aria-label="Permalink: Other" href="#other"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Tracing</h3><a id="user-content-tracing" class="anchor" aria-label="Permalink: Tracing" href="#tracing"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">New requests into the system will be given value that is put into three containers <code>RequestID</code>, a <code>CorrelationID</code>, and a <code>CausationID</code>.</p> <p dir="auto">At each request boundary, -> HTTP, or -> GRPC, or -> Message, a new <code>RequestID</code> is generated, if a previous <code>RequestID</code> exists in the current context it is moved into the <code>CausationID</code>.</p> <ul dir="auto"> <li>At each boundary a new <code>RequestID</code> is generated</li> <li>The <code>CausationID</code> is set to the previous <code>RequestID</code></li> <li>The <code>CorrelationID</code> value remains the same into every new request that results from the original request.</li> </ul> <p dir="auto">These three values can be used to build a map of a request through the system.</p> <p dir="auto">The tracking and management of these IDs is a feature of <a href="https://github.com/stackus/edat/blob/master/core/context.go">edat</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Metrics/Instrumentation</h3><a id="user-content-metricsinstrumentation" class="anchor" aria-label="Permalink: Metrics/Instrumentation" href="#metricsinstrumentation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Prometheus metrics for each service are available at <code>http://localhost:[port]/metrics</code>. The order-service has a few additional counters. See the order-service <a href="/stackus/ftgogo/blob/master/order/cmd/service/main.go">code</a> for more information.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Mono-repository</h3><a id="user-content-mono-repository" class="anchor" aria-label="Permalink: Mono-repository" href="#mono-repository"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This demonstration application is a mono-repository for the Golang services. I chose to use as few additional frameworks as possible, so you'll find there is also quite a bit of shared code in packages under <code>/shared-go</code></p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Shared Code</h3><a id="user-content-shared-code" class="anchor" aria-label="Permalink: Shared Code" href="#shared-code"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><code>/shared-go</code> is named the way it is because I intended to build one of the services in another language. I didn't but left the name the way it was.</p> <p dir="auto">This code exists simply to make it easier for me to build this demonstration. Applying DRY to microservices is a <a href="https://www.devdelly.com/microservice-bad-smells/" rel="nofollow">code-smell</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Monolith</h3><a id="user-content-monolith" class="anchor" aria-label="Permalink: Monolith" href="#monolith"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <blockquote> <p dir="auto">Still a work-in-progress.</p> </blockquote> <p dir="auto">Industry <a href="https://betterprogramming.pub/monolith-first-270613e6396e" rel="nofollow">blogs</a> , <a href="https://www.amazon.com/Monolith-Microservices-Evolutionary-Patterns-Transform/dp/1492047848/" rel="nofollow">books</a>, and <a href="https://codeopinion.com/start-with-a-monolith-not-microservices/" rel="nofollow">talks</a> typically all suggest applications start with a monolith, single deployable application, before developing an application using microservices. Whether you have a legacy monolith application or are starting a new application the last step before microservices is to refactor or design the monolith to be loosely-coupled.</p> <p dir="auto">The service capabilities can all be run together in a monolith to demonstrate what that might look like. It'll at beat represent the final form of a monolith that has been broken up by feature. This kind of monolith has several names. The "Majestic Monolith", the "Loosely-Coupled Monolith", or the "Modular Monolith".</p> <blockquote> <p dir="auto">Note: The monolith came into existence after the development of the microservices. It may not give the best example of what a monolith might look like just before switching to microservices.</p> </blockquote> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Type Registration</h3><a id="user-content-type-registration" class="anchor" aria-label="Permalink: Type Registration" href="#type-registration"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Commands, Events, Snapshots, and other serializable entities get registered in groups in each <code>/"domain"/internal/domain/register_types.go</code> and in the child packages of <code>serviceapis</code>. This type registration is a feature of <a href="https://github.com/stackus/edat/blob/master/core">edat/core</a> and is not unique to this application.</p> <p dir="auto">The purpose of doing this type registration is to avoid boilerplate marshalling and unmarshalling code for every struct.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Changes from FTGO</h2><a id="user-content-changes-from-ftgo" class="anchor" aria-label="Permalink: Changes from FTGO" href="#changes-from-ftgo"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">I intend for this demonstration to exist as a faithful Golang recreation of the original. If a difference exists either because of opinion or is necessary due of the particulars of Go, I will try my best to include them all here.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Changed</h3><a id="user-content-changed" class="anchor" aria-label="Permalink: Changed" href="#changed"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>I've kept most API requests and responses the same "shape" but routes are prefixed with <code>/api</code> and use <code>snake_case</code> instead of <code>camelCase</code> for property names.</li> <li>In FTGO many apis and messages that operated on Tickets used the OrderID as the TicketID. I could have done the same but chose to let the Ticket aggregates use their own IDs. The TicketID was then included in responses and messages where it was needed.</li> <li>Order-History is not using DynamoDB. The purpose of Order-History is to provide a "view" or "query" service, and it should demonstrate using infrastructure best suited for that purpose. For now, I'm using Postgres but intend to use <a href="https://www.elastic.co/what-is/elasticsearch" rel="nofollow">Elasticsearch</a> soon.</li> <li>The <code>OrderService->createOrder</code> method I felt was doing too much. The <a href="/stackus/ftgogo/blob/master/order/internal/application/commands/create_order.go">command</a> implementation creates the order like before, but the published entity event that results from that command is now the catalyst for starting the CreateOrderSaga.</li> <li>To better demonstrate a "Backend-For-Frontend", orders take a consumers <code>addressId</code>. Consumers will register one or more addresses now. The <a href="/stackus/ftgogo/blob/master/customer-web/internal/application/commands/create_order.go">customer-web service</a> uses data from another service to complete the modified CreateOrder command.</li> </ul> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Missing</h3><a id="user-content-missing" class="anchor" aria-label="Permalink: Missing" href="#missing"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li>Tests. Examples of testing these services. Both Unit and Integration are still missing but executable specifications have been added.</li> <li><del>Api-Gateway. I haven't gotten around to creating the gateway.</del> "Backend-for-Frontend"s have been added.</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Out Of Scope</h2><a id="user-content-out-of-scope" class="anchor" aria-label="Permalink: Out Of Scope" href="#out-of-scope"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Just like the original the following are outside the scope of the demonstration.</p> <ul dir="auto"> <li><del>Logins & Authentication</del> The "Backend-for-Frontend"s have implemented this in a very insecure way and only for demonstration purposes.</li> <li><del>Accounts & Authorization</del> The "Backend-for-Frontend"s have implemented this in a very insecure way and only for demonstration purposes.</li> <li>AWS/Azure/GCP or any other cloud deployment instructions or scripts</li> <li>Tuning guidance</li> <li>CI/CD guidance</li> <li>Chaos Testing - although feel free to terminate a service or cdc process for a bit and see if it breaks (it shouldn't)</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Quick Demo</h2><a id="user-content-quick-demo" class="anchor" aria-label="Permalink: Quick Demo" href="#quick-demo"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><strong>DEPRECATED</strong></p> <blockquote> <p dir="auto">TODO: Rewrite. The instructions below no longer work with the changes made to the demo, primarily from the addition of the BFFs.</p> </blockquote> <p dir="auto"><a href="https://www.postman.com/" rel="nofollow">Postman</a> can be used to load the api collection for an easy demo.</p> <p dir="auto">With the application running using one of the commands above you can make the following calls to see the processes, events, and entities involved.</p> <ul dir="auto"> <li>Register Consumer</li> <li>Sign In Consumer</li> <li>Add Consumer Address</li> <li>Create Order</li> <li>Consumer Service: Register Consumer</li> <li>Restaurant Service: Create Restaurant</li> <li>Order: Create Order</li> </ul> <p dir="auto">Loading <code>FTGOGO.postman_collection.json</code> into Postman will provide pre-built calls with semi-random data that can be used to test the above.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Contributing</h2><a id="user-content-contributing" class="anchor" aria-label="Permalink: Contributing" href="#contributing"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.</p> <p dir="auto">Please make sure to update tests as appropriate.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">No warranties</h2><a id="user-content-no-warranties" class="anchor" aria-label="Permalink: No warranties" href="#no-warranties"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">From time to time I expect to make improvements that may be breaking. I provide no expectation that local copies of this demonstration application won't be broken after fetching any new commit(s). If it does fail to run; simply remove the related docker volumes and re-run the demonstration.</p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="aw3p3bWPHFzKX9XKunIp64yIM5nNq0k89VfCTIOzDKU3w0rECzdHIWFixtFoUVQs3Q1BHwFwHaH6C2gka99afg==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> FTGOGO - event-driven architecture demonstration application using edat </p> <h3 class="sr-only">Topics</h3> <div class="my-3"> <div class="f6"> <a href="/topics/golang" title="Topic: golang" data-view-component="true" class="topic-tag topic-tag-link"> golang </a> <a href="/topics/cqrs" title="Topic: cqrs" 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