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Mattermost Developer Blog

Maintaining Consistency in Codebases with Go vet Posted on Mar 17, 2020 by Jesús Espino

Maintaining success in a large open-source project is one of the key objectives of Mattermost. We have hundreds of contributors and we want to create a project that could serve as a model in the Go community. Having said that, following idiomatic Go principles is the thing that we care most about while maintaining our code consistency. For this specific task, we utilized go vet and with this blog post, I would like to explain how we pushed the limits of this tool by extending it.

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Instrumenting Go code via AST, Part 2 Posted on Mar 15, 2020 by Eli Yukelzon

Welcome! This is the second part of our AST blog post series, expanding on the subject of utilizing Go AST libraries to automate and improve your workflow. In this post I’ll discuss a rather common problem that comes up while working with Go code and the way we’ve solved it by sprinkling a little bit of AST magic dust. Let’s dive in. Problem: A struct with no interface Let’s say you are working on a large code base that was not built with interfaces in mind, meaning, there are structs and methods attached to those structs, but there is no interface describing it.

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Layered Store and Struct Embedding in Go Posted on Feb 26, 2020 by Jesús Espino

One of the most important parts of the Mattermost source code is the one responsible for accessing the Mattermost database - the store. Every single database access is handled by the store, so we needed to find a way to extend its functionality while introducing as little complexity as possible. This is the reason behind the current layered approach using struct embedding. Our store is responsible for storing and retrieving data, and sometimes we need to add functionality that is not strictly related to the database queries, for example, cache data or add instrumentation.

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Incorporating GolangCI-Lint at Mattermost Posted on Jan 13, 2020
by Agniva De Sarker and Ben Schumacher

At Mattermost, we have traditionally relied on the trusty go vet and gofmt checks for our CI runs. Although it works well, there are a lot of other powerful linters out there which we’re potentially missing out on. Speaking of linters, the first name that inevitably comes up is staticcheck. It’s a powerful metalinter with a whole slew of checks. But simply running staticcheck is not sufficient, because it misses out on other linters which perform a single task, but nevertheless are very powerful.

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On Hermes and Mattermost Posted on Dec 20, 2019 by Miguel Alatzar

With the upgrade to React Native 61 came the prospect of substantially improving performance of our Android app. How? Through the use of Hermes, Facebook’s new JavaScript engine. To say that we were excited is an understatement. And with that excitement came curiosity: how is this new JavaScript engine achieving performance boosts? Let’s first chat a bit about JS engines in general. How does your JavaScript code eventually get executed by the CPU on the machine?

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Onboarding with Mattermost Posted on Dec 20, 2019 by CJ Wild

I recently joined Mattermost as a Remote Software Engineer and while I’ve worked in remote environments before, I was really surprised at how amazing this company is to work with. During my onboarding I discovered that they have really developed a culture built around being remote; one that allowed for me to feel as part of a larger team and always engaged, rather than separated from my peers and working alone.

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KubeCon NA 2019 Posted on Dec 18, 2019 by Gabe Jackson

It wasn’t my first time flying. It also wasn’t the first time I had arrived at the airport early enough to require multiple cups of coffee. As I sat at my gate, however, I did find myself wondering for the first time: had I ever heard the words “Lambda,” “stateful set”, and “yaml” while waiting to board? You see, a bunch of us were coming from all over to attend KubeCon + CloudNativeCon North America 2019.

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Monitoring a Multi-Cluster Environment Using Prometheus Federation and Grafana Posted on Dec 18, 2019 by Stylianos Rigas

Monitoring the state of your clusters is an effective way to discover bottlenecks in your multi-cluster production environment. It is one of the key challenges that development teams are facing and factors such as the team experience as well as the number and distribution of the applications can make things even more complex. Better monitoring can help identify single points of failure. Being able to get information about things like the number of applications running on each node or the CPU and memory performance can help to get closer to zero downtime deployments.

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Localizing Matterpoll Posted on Dec 11, 2019 by Ben Schumacher

Matterpoll is a plugin that allows users to create polls in Mattermost. Since Mattermost is localized in 16 different languages, it’s optimal that Matterpoll is similarly localized. Because we rely on contributors to do the translations, we want to make it easy for them to translate new strings and determine whether already translated strings need to be updated because the “source” text changed. On the other hand, Matterpoll only has two maintainers (@kaakaa and me) and no infrastructure of its own to work with.

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Unit testing mmctl commands Posted on Nov 7, 2019 by Miguel de la Cruz

Mattermost is starting a new Open Source campaign, this time around increasing the unit test coverage for the mmctl tool. The mmctl tool is a CLI application that mimics the commands and features of the current Mattermost CLI tool and uses the Mattermost REST API to communicate with the server. Using the tool, you can control and manage several Mattermost servers without having to access the specific machine on which the server is running.

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