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fatcontext
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/
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