detects nested contexts in loops
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- [github.com/golangci/golangci-lint: v1.58.2 → v1.59.0](https://github.com/golangci/golangci-lint/compare/v1.58.2...v1.59.0)
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README.md Update README.md 2024-04-06 09:09:43 +02:00

fatcontext

fatcontext is a Go linter which detects potential fat contexts in loops. They can lead to performance issues, as documented here: https://gabnotes.org/fat-contexts/

Installation / usage

fatcontext is available in golangci-lint since v1.58.0.

go install github.com/Crocmagnon/fatcontext/cmd/fatcontext@latest
fatcontext ./...

There are no specific configuration options or custom command-line flags.

Example

package main

import "context"

func ok() {
	ctx := context.Background()

	for i := 0; i < 10; i++ {
		ctx := context.WithValue(ctx, "key", i)
		_ = ctx
	}
}

func notOk() {
	ctx := context.Background()

	for i := 0; i < 10; i++ {
		ctx = context.WithValue(ctx, "key", i) // "nested context in loop"
		_ = ctx
	}
}

Development

Setup pre-commit locally:

pre-commit install

Run tests & linter:

make lint test

To release, just publish a git tag:

git tag -a v0.1.0 -m "v0.1.0"
git push --follow-tags