package hlog_test import ( "net/http" "os" "time" "net/http/httptest" "github.com/rs/zerolog" "github.com/rs/zerolog/hlog" ) // fake alice to avoid dep type middleware func(http.Handler) http.Handler type alice struct { m []middleware } func (a alice) Append(m middleware) alice { a.m = append(a.m, m) return a } func (a alice) Then(h http.Handler) http.Handler { for i := range a.m { h = a.m[len(a.m)-1-i](h) } return h } func init() { zerolog.TimestampFunc = func() time.Time { return time.Date(2001, time.February, 3, 4, 5, 6, 7, time.UTC) } } func Example_handler() { log := zerolog.New(os.Stdout).With(). Timestamp(). Str("role", "my-service"). Str("host", "local-hostname"). Logger() c := alice{} // Install the logger handler with default output on the console c = c.Append(hlog.NewHandler(log)) // Install some provided extra handler to set some request's context fields. // Thanks to those handler, all our logs will come with some pre-populated fields. c = c.Append(hlog.RemoteAddrHandler("ip")) c = c.Append(hlog.UserAgentHandler("user_agent")) c = c.Append(hlog.RefererHandler("referer")) //c = c.Append(hlog.RequestIDHandler("req_id", "Request-Id")) // Here is your final handler h := c.Then(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { // Get the logger from the request's context. You can safely assume it // will be always there: if the handler is removed, hlog.FromRequest // will return a no-op logger. hlog.FromRequest(r).Info(). Str("user", "current user"). Str("status", "ok"). Msg("Something happend") })) http.Handle("/", h) h.ServeHTTP(httptest.NewRecorder(), &http.Request{}) // Output: {"time":"2001-02-03T04:05:06Z","level":"info","role":"my-service","host":"local-hostname","user":"current user","status":"ok","message":"Something happend"} }