fatcontext is a Go linter which detects potential fat contexts in loops or function literals.
They can lead to performance issues, as documented here: https://gabnotes.org/fat-contexts/
fatcontext is available in golangci-lint since v1.58.0.
go install go.augendre.info/fatcontext/cmd/fatcontext@latest
fatcontext ./...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
}
}Setup pre-commit locally:
pre-commit installRun tests & linter:
make lint testTo release, just publish a git tag:
git tag -a v0.1.0 -m "v0.1.0"
git push --follow-tags