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<section id="primary"> <div id="content" role="main"> <header class="page-header"> <h1 class="page-title"> Monthly Archives: <span>January 2022</span> </h1> </header> <article id="post-3617" class="post-3617 post type-post status-publish format-standard hentry category-uncategorized"> <header class="entry-header"> <h1 class="entry-title"><a href="https://code.flickr.net/2022/01/04/a-pluggable-solution-for-api-observability-on-our-php-system/" rel="bookmark">A Pluggable Solution for API Observability on our PHP System</a></h1> <div class="entry-meta"> <span class="sep">Posted on </span><a href="https://code.flickr.net/2022/01/04/a-pluggable-solution-for-api-observability-on-our-php-system/" title="2:51 pm" rel="bookmark"><time class="entry-date" datetime="2022-01-04T14:51:11-08:00">January 4, 2022</time></a><span class="by-author"> <span class="sep"> by </span> <span class="author vcard"><a class="url fn n" href="https://code.flickr.net/author/nickscheiblauer/" title="View all posts by nickscheiblauer" rel="author">nickscheiblauer</a></span></span> </div> </header> <div class="entry-content"> <p><span style="font-weight: 400">When people think about tech and innovation, they often talk about the “next generation.”</span></p> <p><span style="font-weight: 400">Just use GraphQL and life will be easier, many will tell you.</span></p> <p><span style="font-weight: 400">The future of cloud-native is </span><i><span style="font-weight: 400">Lambda</span></i><span style="font-weight: 400">, claim others.</span></p> <p><span style="font-weight: 400">Unfortunately, most of the conversations don’t talk about the question that is most top-of-mind for me: what does the next generation of tools look like </span><i><span style="font-weight: 400">for legacy systems</span></i><span style="font-weight: 400">?</span></p> <p><span style="font-weight: 400">As a Senior Engineering Manager for Flickr’s backend team, here’s one of the major issues my team faces: we have a ton of code that engineers need to understand in order to safely and quickly ship changes. Flickr has built a product loved by millions of photographers for nearly two decades and we have some real history in our code base. You can imagine the amount of work it takes to maintain the stability of our large, complex, public-facing API—which impacts not just customers who use our API, but our own web, mobile, and desktop clients.</span></p> <p><span style="font-weight: 400">The difficulty of wrangling a legacy code base is what led us to be interested in </span><a href="https://www.akitasoftware.com/"><span style="font-weight: 400">Akita</span></a><span style="font-weight: 400">, an observability company going after the dream of “one-click” observability. Akita’s first product passively watches API traffic using packet capture (PCAP) to provide automated API monitoring, automatically infer the structure of API endpoints, and automatically detect potential issues and breaking changes. Akita’s goal is to make it possible for organizations like ours, with our hundreds of thousands of lines of legacy code, to understand system behavior in order to move quickly.</span></p> <p><span style="font-weight: 400">But there’s a catch: Akita’s first product, currently in beta, works only for representational state transfer (REST) APIs. Our API at Flickr, nearly twenty years old, coincides with the rise of REST. This blog post focuses on how I used Akita to introduce observability to our code base.</span></p> <h2><span style="font-weight: 400">Moving fast with legacy systems</span></h2> <p><span style="font-weight: 400">First, let me give some context on high-level responsibilities of backend engineering at Flickr. Since moving Flickr into the cloud two years ago we’ve had more time to focus on modernizing our services and improving our developer experience. This puts us in a much better position to build new features than before—but first, we need to streamline how we get things done, which is not nearly as simple as it sounds.</span></p> <p><span style="font-weight: 400">Today, we serve up around a billion photos daily from millions of photographers. Nearly every Flickr API request executes legacy code in some way—code that is less tested, less documented, and sometimes dangerous to mess with. A great deal of care has to be taken to avoid disruptions. And when new features need to interact with older features, this can get complex fast! On top of all that, we need to find ways to help our small but mighty team focus their limited time and attention while navigating the old and the new, without the luxury of handing this problem over to an internal tools team.</span></p> <p><span style="font-weight: 400">Our difficulty getting a handle on our legacy systems led us to become excited about using Akita for easy observability. Akita promised to tell us about our API interactions and potential issues with the API, all by passively watching API traffic. But there was, as I mentioned, a catch: Akita works only for REST APIs right now, and our API is… RESTish. Most notably, we never adopted the REST convention of using distinct URL paths for each service endpoint, and we rely heavily on passing parameters through the query string, or form-encoded in POSTs. This situation has historically made it hard for us to use other API tools as well.</span></p> <h2><span style="font-weight: 400">Getting Akita to work for my REST-like format</span></h2> <p><span style="font-weight: 400">Thankfully our PHP request handlers are plug and play so I quickly whipped up a new proof-of-concept handler showing that we </span><i><span style="font-weight: 400">could</span></i><span style="font-weight: 400"> start getting visibility into our API endpoints and their behavior using Akita. This gave me the ability to generate Akita traces using curl and the Akita command line interface (CLI) tool out of the box, but only within my local dev environment.</span></p> <p><img decoding="async" class="alignnone size-medium wp-image-3620" src="https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-11-04-at-4.28.16-PM.png?w=800" alt="A screen shot of the Akita web console. The shot depicts the detected aPI specification of a single Flickr API call." width="800" height="334" srcset="https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-11-04-at-4.28.16-PM.png 2450w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-11-04-at-4.28.16-PM.png?resize=150,63 150w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-11-04-at-4.28.16-PM.png?resize=800,334 800w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-11-04-at-4.28.16-PM.png?resize=768,321 768w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-11-04-at-4.28.16-PM.png?resize=1024,428 1024w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-11-04-at-4.28.16-PM.png?resize=1536,642 1536w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-11-04-at-4.28.16-PM.png?resize=2048,856 2048w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-11-04-at-4.28.16-PM.png?resize=500,209 500w" sizes="(max-width: 800px) 100vw, 800px" /></p> <p><span style="font-weight: 400">Right away I spotted some things to improve, and more ideas came that afternoon. I wanted to put our `api_key` parameter into an Authorization header, and remove the `method` parameter since I’d used it in a fake service path. Also, our API returns a 200 HTTP Status on errors, including an element `stat` indicating failure. I wanted those to be HTTP 400s.</span></p> <p><span style="font-weight: 400">But I had a conundrum: Akita works best when observing production traffic. Real, production API requests at production load will really fill in the nooks and crannies of our API models. My progress showed it would be </span><i><span style="font-weight: 400">so worth it</span></i><span style="font-weight: 400"> to go further, so I met with the Akita team and discussed using their Go-based plugin system to transform our live requests into a desirable format based on my proof-of-concept. It turns out that most of Akita’s tooling is </span><a href="https://github.com/akitasoftware/akita-cli"><span style="font-weight: 400">open source</span></a><span style="font-weight: 400"> and I could work on the plugin myself! This turned out to be the key to making Akita work with our RESTish format.</span></p> <h2><span style="font-weight: 400">Fitting into the Go plugin format</span></h2> <p><span style="font-weight: 400">Exciting news! I just needed to turn my prototype into something that I could run with the Akita agent every time.</span></p> <p><span style="font-weight: 400">The Akita CLI has a mechanism for dynamically loading plugins, which can operate on the captured and parsed data before it is sent to the Akita cloud. My transformations of the API format into a more REST-like format could be packaged that way.</span></p> <p><span style="font-weight: 400">I soon discovered that I was the first person to try building a third-party plugin. Akita told me that they used the plugin architecture internally to package a non-open-source plugin that infers data formats, but that is compiled into the client. </span></p> <p><span style="font-weight: 400">My early attempts at working with the released CLI version resulted in nothing but discouraging error messages like:</span></p> <p><em><span style="font-weight: 400">fatal error: runtime: no plugin module data</span></em></p> <p><span style="font-weight: 400">I worked around this by compiling the open-source version of the Akita CLI myself and pointing the plugin build at the exact same version of the source code. An engineer at Akita reported the same problem and concluded that the plugin needed to be built at the same time as the program that will use it. Go’s idiosyncratic linking conventions seem to make it virtually impossible for such an external plugin to satisfy its dependencies against multiple versions of the base binary. Later, we learned the following from Russ Cox, confirming that our decision to abandon the external plugin approach was wise:</span></p> <p><a href="https://twitter.com/_rsc/status/1459257455360229387"><span style="font-weight: 400">https://twitter.com/_rsc/status/1459257455360229387</span></a></p> <p><img decoding="async" class="alignnone size-medium wp-image-3622" src="https://code.flickr.net/wp-content/uploads/sites/3/2022/01/image3.png?w=767" alt="Screenshot of a Tweet from Russ Cox that responds to a quoted question asking what the Go Team's direction for Go Plugins is. Russ answers, "Kind of rudderless right now. Higher priority things are taking all our cycles, so mostly benign neglect for plugins. Sorry."" width="767" height="355" srcset="https://code.flickr.net/wp-content/uploads/sites/3/2022/01/image3.png 767w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/image3.png?resize=150,69 150w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/image3.png?resize=500,231 500w" sizes="(max-width: 767px) 100vw, 767px" /></p> <p><span style="font-weight: 400">To make this process repeatable, we adopted a hybrid approach where I added the Flickr-specific transformations of the API as a plugin in a newly created Akita open source repository. (</span><a href="https://github.com/akitasoftware/plugin-flickr"><span style="font-weight: 400">You can check out the code here</span></a><span style="font-weight: 400">!) Akita will compile that plugin in all their future CLI builds so there would be no problem with dynamic loading. I can enable the plugin for my traces with a command-line flag and use the most recent version of the CLI without recompiling my plugin to match. This is the same way Akita incorporates modules for type inference. Other users can incorporate contributions in a similar way.</span></p> <h2><span style="font-weight: 400">Using Akita to move faster</span></h2> <p><span style="font-weight: 400">Now that we have the plugin written, we’re moving toward integration with our production environment. Here’s an example of what we’re able to understand with Akita. Note that the </span><em><span style="font-weight: 400">person.new</span></em><span style="font-weight: 400"> response element has been detected as both datetime and string data types. We should fix that!</span><img loading="lazy" decoding="async" class="alignnone size-medium wp-image-3621" src="https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-12-21-at-8.23.47-AM.png?w=800" alt="Another screenshot of the Akita web console. Two entries are highlighted, showing instances of mixed data types detected for the same field. " width="800" height="232" srcset="https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-12-21-at-8.23.47-AM.png 2548w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-12-21-at-8.23.47-AM.png?resize=150,44 150w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-12-21-at-8.23.47-AM.png?resize=800,232 800w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-12-21-at-8.23.47-AM.png?resize=768,223 768w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-12-21-at-8.23.47-AM.png?resize=1024,297 1024w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-12-21-at-8.23.47-AM.png?resize=1536,446 1536w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-12-21-at-8.23.47-AM.png?resize=2048,595 2048w, https://code.flickr.net/wp-content/uploads/sites/3/2022/01/Screen-Shot-2021-12-21-at-8.23.47-AM.png?resize=500,145 500w" sizes="auto, (max-width: 800px) 100vw, 800px" /></p> <p><span style="font-weight: 400">Here’s what we’re integrating Akita to do:</span></p> <ul> <li><b>Taking snapshots of our API endpoints. </b><span style="font-weight: 400">Having a large API footprint makes it all the more important for us to generate defacto specifications and curate the result, rather than try to hand-write specifications from scratch. Once we have a solid OpenAPI3 specification we can make tactical changes to ensure the API adheres to the spec without doing a full-on rewrite of the backend.</span></li> </ul> <ul> <li><b>Identifying changes to our API endpoints. </b><span style="font-weight: 400">The ability to detect unexpected or off-spec responses will make it a lot easier for us to code from the client side, particularly the Android and iOS mobile apps. We expect to reduce defensive exception handling on the client side, making our mobile code easier to work with and less of a resource hog. </span></li> <li><b>Tracking our inter-service communication as we modernize our infrastructure. </b><span style="font-weight: 400">Observing the interaction between services is increasingly important as we use more and more microservices and refine our service oriented architecture. For example, having a high level view of impacted services during a production incident will expedite service recovery and get our users back to doing what they love.</span></li> </ul> <p><span style="font-weight: 400">While we currently have metrics, monitoring, and logging in place with AWS CloudWatch and Splunk, Akita is able to provide us the information we need in a structured, per-endpoint way, making it easier for our developers to understand what’s going on and focus their attention on what matters. Stay tuned for updates!</span></p> <h2><span style="font-weight: 400">Thoughts on tools for legacy systems in general</span></h2> <p><span style="font-weight: 400">I see our partnership with Akita as a key part of the beginning of our effort to innovate how to move fast with a legacy system. This problem is not unique to us: Facebook has built multiple type systems for multiple different dynamically typed languages to deal with it! But the fact that we can’t spin off dedicated teams to write compilers for PHP places its own set of constraints. And there are many companies that are in a similar boat: small or medium sized engineering teams of passionate, driven, smart people working on products they love and want you, their customer, to love, too.</span></p> <p><span style="font-weight: 400">I love working on these sorts of problems because they are among the hardest to solve. It takes a lot more than finding a new database or coming up with a faster algorithm; working with large legacy codebases presents challenges that seem intractable. In my experience, you need the right balance of organization, process, tooling, and grit. </span></p> <p><span style="font-weight: 400">Successful companies eventually reach the point where addressing these things is critical and necessary or delivering value slows to a crawl. I’ve found Flickr to be a unique combination of legacy systems, wonderful engineering heritage, and forward-looking, motivated people. If you work somewhere that would benefit from improved production and development observability, you should </span><a href="https://www.akitasoftware.com/"><span style="font-weight: 400">check out what Akita is up to</span></a><span style="font-weight: 400">. 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