Mattermost Logo
We're hiring!

The Mattermost Developer Blog

Streamlining Developer Access to Prometheus and Grafana Posted on Feb 2, 2021 by Jesse Hallam

With access to the Enterprise source code, the developer build tooling now automates the setup of Prometheus and Grafana for performance monitoring. Even the canonical Grafana dashboards are setup without any manual configuration required!

Read More
Avoiding Common Internationalization Mistakes Posted on Dec 4, 2020 by Harrison Healey

Languages are complicated, and every language is complicated in different ways that can be hard to understand without learning every single one of them. Some languages form words from multiple characters while others have symbols that represent entire concepts. Some feature words without pluralization or gender and rely on context for that while others have two or even more genders for words. Some are very phonetic while others pronounce words seemingly at random (cough English, though cough).

Read More
Tuning MySQL and the Ghost of Index Merge Intersection Posted on Nov 17, 2020 by Agniva De Sarker

Optimizing SQL queries is always fun, except when it isn’t. If you’re a MySQL veteran and have read the title, you already know where this is heading 😉. In that case, allow me to regale the uninitiated reader. This is the story of an (apparently) smart optimization to a SQL query that backfired spectacularly and how we finally fixed it. Act I: A slow query It started off with a customer noticing that a SQL query was running slowly in their environment.

Read More
Docker Content Trust in GitLab's .gitlab-ci.yml with Delegation Posted on Oct 28, 2020 by Elisabeth Kulzer

At the start of implementing Docker Content Trust in our workflow, I thought it shouldn’t take so long. I thought and of course I was wrong. The following is the boiled down version of what I learned and wished for starting out. Prerequisites Docker version: 19.03.12 root *.key + passphrase for the Docker Content Trust delegation/signer private key *.key + public key *.pub + passphrase for the delegated person/bot, who should sign the repository/image:tag Please make sure you have your keys backed up and versioned.

Read More
Improving performance (and more) through load testing Posted on Sep 7, 2020 by Claudio Costa

Have you ever wondered how many active users your application can handle at the same time? If so, you’re not alone. Here at Mattermost we’re building a highly concurrent messaging platform for team collaboration that needs to potentially serve up to several thousands of users simultaneously. While standard functional testing (e.g. unit tests) is critical to verify correct behavior of your application, it’s usually not sufficient to guarantee its performance at scale.

Read More
Automated UI Testing With Cypress Posted on Jul 27, 2020 by Saturnino Abril

It’s been more than a year and a half since we started using Cypress for our automated functional testing and it has been worth the investment. It has now become an essential part of our process to automate regression testing to ship new releases faster, with increased quality. It’s fun and easy to get started with Cypress but as we added more scripts with the varying requirements, we faced several setbacks and hurdles, such as flaky tests, which slow down our efforts in automating test cases.

Read More
From OpenVPN to Pritunl VPN: The transition Posted on Jun 11, 2020 by Angelos Kyratzakos

Usually organizations use an internal network to prevent unauthorized people from connecting to their private network and by using their own network infrastructure/connectivity they can maintain their desirable level of security for their data. But it would be convenient for users to connect to that private network while they are away from the office’s building, on their own internet connection. To solve that problem, VPN (Virtual Private Network) is used to allow authorized remote access to an organization’s private network.

Read More
OpenTracing for Go Projects Posted on Jun 10, 2020 by Eli Yukelzon

What is distributed tracing? Large-scale cloud applications are usually built using interconnected services that can be rather hard to troubleshoot. When a service is scaled, simple logging doesn’t cut it anymore and a more in-depth view into system’s flow is required. That’s where distributed tracing comes into play; it allows developers and SREs to get a detailed view of a request as it travels through the system of services. With distributed tracing you can:

Read More
Getting Hands-on with io_uring using Go Posted on May 20, 2020 by Agniva De Sarker
In Linux, system calls (syscalls) are at the heart of everything. They are the primary interface through which an application interacts with the kernel.

In Linux, system calls (syscalls) are at the heart of everything. They are the primary interface through which an application interacts with the kernel. Therefore, it is vital that they are fast. And especially in a post-Spectre/Meltdown world, this is all the more important. A major chunk of the syscalls deal with I/O, because that’s what most applications do. For network I/O, we’ve had the epoll family of syscalls which have provided us with reasonably fast performance.

Read More
Advanced Git with the Free University of Tbilisi Posted on Mar 27, 2020 by Jesse Hallam
Jesse Hallam gives a virtual course on advanced Git at the Free University of Tbilisi.

On Monday, March 16, 2020, I had the privilege to (virtually) join Shota Gvinepadze and his students at the Free University of Tbilisi and speak about “Advanced Git @ Mattermost” for a portion of their class time. The following are my speaking notes from the session, slightly modified from the original slides for this format. Keep in mind that the command line examples are illustrative of my workflow, and not meant to be run in isolation.

Read More