BAC-L1-COSMOS-102Cosmos SDK
Go II — concurrency, contexts, testing
A node is a concurrent program. Goroutines, channels and cancellation contexts: the toolkit that keeps that concurrency from becoming a trap.
- Level
- L1 — Blockchain developer
- Duration
- 4 h
- Track
- Cosmos SDK
- Maintainer
- Cosmos Lead Architect
Learning objectives
- 01Coordinate goroutines through channels and contexts
- 02Shut down a concurrent service cleanly
- 03Detect a data race with tooling
Guided lab
Write a cancellable concurrent block collector and test it under the race detector.
Independent lab
Deliberately introduce a race, have the tooling catch it, then fix it.
Security angle
A data race inside a node produces divergent state between validators — that is, a fork.
Assessment
Concurrent service tested with a clean race-detector run.