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Joe Tsai 241a541864 util/ctxkey: add package for type-safe context keys (#10841) ... The lack of type-safety in context.WithValue leads to the common pattern of defining of package-scoped type to ensure global uniqueness: type fooKey struct{} func withFoo(ctx context, v Foo) context.Context { return context.WithValue(ctx, fooKey{}, v) } func fooValue(ctx context) Foo { v, _ := ctx.Value(fooKey{}).(Foo) return v } where usage becomes: ctx = withFoo(ctx, foo) foo := fooValue(ctx) With many different context keys, this can be quite tedious. Using generics, we can simplify this as: var fooKey = ctxkey.New("mypkg.fooKey", Foo{}) where usage becomes: ctx = fooKey.WithValue(ctx, foo) foo := fooKey.Value(ctx) See https://go.dev/issue/49189 Updates #cleanup Signed-off-by: Joe Tsai <joetsai@digital-static.net>		2 years ago
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key.go	util/ctxkey: add package for type-safe context keys (#10841)	2 years ago
key_test.go	util/ctxkey: add package for type-safe context keys (#10841)	2 years ago