add logging

main.go

@@ -6,6 +6,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"time"
 
 	"github.com/sugarme/tokenizer"
 	"github.com/sugarme/tokenizer/pretrained"
@@ -193,6 +194,25 @@ func vectorHandler(w http.ResponseWriter, r *http.Request) {
 	})
 }
 
+type statusRecorder struct {
+	http.ResponseWriter
+	status int
+}
+
+func (r *statusRecorder) WriteHeader(code int) {
+	r.status = code
+	r.ResponseWriter.WriteHeader(code)
+}
+
+func loggingMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		start := time.Now()
+		rec := &statusRecorder{ResponseWriter: w, status: http.StatusOK}
+		next.ServeHTTP(rec, r)
+		log.Printf("%s %s %s %d %s", r.RemoteAddr, r.Method, r.URL.Path, rec.status, time.Since(start))
+	})
+}
+
 func healthHandler(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
 	json.NewEncoder(w).Encode(map[string]string{"status": "ok"})
@@ -206,6 +226,7 @@ func main() {
 
 	http.HandleFunc("/vector", vectorHandler)
 	http.HandleFunc("/ok", healthHandler)
+	log.SetOutput(os.Stdout)
 	log.Printf("Starting server on port %s...\n", port)
-	log.Fatal(http.ListenAndServe(":"+port, nil))
+	log.Fatal(http.ListenAndServe(":"+port, loggingMiddleware(http.DefaultServeMux)))
 }