Awesome

trc

trc provides in-process request tracing, an efficient alternative to logging. The package is heavily inspired by https://golang.org/x/net/trace, much gratitude to those authors.

Most users should import package eztrc, which offers an API designed for most common use cases.

Here's a quick-and-dirty usage example for a typical HTTP server.

func main() {
	server := NewServer(...) // your HTTP server
	traced := eztrc.Middleware(categorize)(server)
	go func() { log.Fatal(http.ListenAndServe(":8080", traced)) }() // normal API

	traces := eztrc.Handler()
	go func() { log.Fatal(http.ListenAndServe(":8081", traces)) }() // traces UI

	select {}
}

func categorize(r *http.Request) string {
	return r.Method + " " + r.URL.Path // assuming a fixed and finite set of possible paths
}

func someFunction(ctx context.Context, ...) {
	eztrc.Tracef(ctx, "this is a log statement")
	// ...
}

Traces can be viewed, queried, etc. through a web UI.

<kbd><img src="/ui.png"/></kbd>

See the examples directory for more complete example applications.

The current API is experimental and unstable. Breaking changes are guaranteed. Use at your own risk.