Add access log handler

README.md

@@ -189,6 +189,15 @@ 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.AccessHandler(func(r *http.Request, status, size int, duration time.Duration) {
+    hlog.FromRequest(r).Info().
+        Str("method", r.Method).
+        Str("url", r.URL.String()).
+        Int("status", status).
+        Int("size", size).
+        Dur("duration", duration).
+        Msg("")
+}))
 c = c.Append(hlog.RemoteAddrHandler("ip"))
 c = c.Append(hlog.UserAgentHandler("user_agent"))
 c = c.Append(hlog.RefererHandler("referer"))

hlog/hlog.go

@@ -5,10 +5,12 @@ import (
 	"context"
 	"net"
 	"net/http"
+	"time"
 
 	"github.com/rs/xid"
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
+	"github.com/zenazn/goji/web/mutil"
 )
 
 // FromRequest gets the logger in the request's context.
@@ -152,3 +154,15 @@ func RequestIDHandler(fieldKey, headerName string) func(next http.Handler) http.
 		})
 	}
 }
+
+// AccessHandler returns a handler that call f after each request.
+func AccessHandler(f func(r *http.Request, status, size int, duration time.Duration)) func(next http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			start := time.Now()
+			lw := mutil.WrapWriter(w)
+			next.ServeHTTP(lw, r)
+			f(r, lw.Status(), lw.BytesWritten(), time.Since(start))
+		})
+	}
+}