httprwd

A simple http.ResponseWriter delegate that keeps track of the response code.

Installation

go get github.com/jmcfarlane/httprwd/...

Usage

The typical use case is when you want to emit metrics about an http route, and include the response code.

d := &httprwd.ResponseWriterDelegate{ResponseWriter: w}
start := time.Now()
handler.ServeHTTP(d, r)
handlerDuration.WithLabelValues(
    r.URL.Path,
    r.Method,
    strconv.Itoa(d.Code),
).Observe(time.Since(start).Seconds())

Working example

go run example/main.go
curl -s localhost:8080
curl -s localhost:8080/metrics

Tests

$ go test -v -cover -race
=== RUN   TestResponseWriterDelegateStatusOK
--- PASS: TestResponseWriterDelegateStatusOK (0.00s)
=== RUN   TestResponseWriterDelegateStatusNotFound
--- PASS: TestResponseWriterDelegateStatusNotFound (0.00s)
=== RUN   TestResponseWriterDelegateStatusUnset
--- PASS: TestResponseWriterDelegateStatusUnset (0.00s)
PASS
coverage: 100.0% of statements
ok  	github.com/jmcfarlane/httprwd	1.012s