An explorer and visualizer for Go concurrency patterns

#565 — August 6, 2025

☀️ We're taking next week off, so this will be the last issue until Wednesday, August 20. Just a little summer vacation.
__
Peter Cooper, your editor

Go Weekly

Go Concurrency Explorer and Visualizer — After watching Rob Pike’s ▶️ talk on Go concurrency patterns, a developer created a live WASM-powered coding environment and visualizer to get a better feel for common concurrency patterns. There are several tutorials to enjoy in here, too.

Richard Chukwu

Build Containers from Scratch — Start with raw Linux tools like chroot, namespaces, and cgroups to truly understand how containers work. Then build your own with Docker and deploy them using Kubernetes.

Frontend Masters sponsor

Crush: Charm's Entry into the AI Coding Agent Space — The folks at Charm are well known for their vast array of fantastic Go libraries, like Bubble Tea and Glamour – now they’ve turned their hand to a Go-powered AI coding agent in a similar vein to Claude Code.

Charm

💡 A potentially more interesting part of this is the use of Ultraviolet, a 'set of primitives for manipulating terminal emulators' in dynamic and elaborate ways.

IN BRIEF:

GoLand 2025.2, the latest version of JetBrains' popular Go IDE, is out with a variety of minor enhancements.
As of Go 1.25, Microsoft's custom builds of Go will default to using system-provided cryptography, previously they used a custom approach to meet Microsoft's internal security policies.

Go Assembly Mutation Testing — Filippo works on Go’s cryptography libraries and for Go 1.26 is exploring a new way to enhance checking the code coverage of tests over this complex, mission critical code. Few readers will need to work this deep, but it’s fascinating to see what’s going on behind the scenes.

Filippo Valsorda

Be Careful with Go Struct Embedding — Embedding structs can quietly mask deeper-nested fields: a duplicate field name isn’t ambiguous unless it appears at the same ‘depth’, meaning your program may choose an unintended value.

Matt Hall

📄 Building Maybe the Fastest Disk Usage Program on macOS – Building first with Go, then with Rust. Andrew Healey

📄 Understanding Reading All Available Things from a Go Channel (with a Timeout) Chris Siebenmann

📄 How to Use MongoDB with Go Oluwadamilola Oshungboye

🛠 Code & Tools

Statsviz 0.7: Instant Visualization of Your App's Runtime Statistics — A way to visualize real time plots of various runtime metrics including heap (size, alloc, etc.), object allocation, goroutines, CPU usage, and more. We first linked to this several years ago, but it’s just had a redesign of its frontend.

Aurélien Rainone

TreeView: Display Tree Structures at the Terminal — A way to display and allow the navigation of tree structures in terminal apps - think things like directory trees, say. It has Bubble Tea and Lip Gloss support and there are numerous visual examples here. GPL 3.0 licensed.

Digital Shane

Level Up Your Auth for Not Only Your Users, but Also Your AI Agents — Auth0 is a full IdP that provides robust security and control over the user experience, from sign-up flows to advanced authorization.

Auth0 sponsor

Inbucket 3.1: A Disposable Webmail Server with SMTP, POP3, and More — A self hostable service for testing email – it accepts messages for any email address and makes them available over Web, REST and POP3 interfaces. GitHub repo.

James Hillyerd

dwarfreflect: Enhanced Reflection using DWARF Debug Information — Solves the long-standing limitation where Go’s reflect can’t access function parameter names by using DWARF debug information at runtime.
Matteo Grella

cors: A Principled CORS Middleware Library — Claims to be “perhaps the best CORS middleware library for Go.”
jub0bs

☁️ Stormy: Neofetch-Inspired CLI Weather Displaying Tool
Ashish Kumar