feat: crl support, metrics

internal/metrics/middleware.go

@@ -0,0 +1,35 @@
+package metrics
+
+import (
+	"log"
+	"net/http"
+	"strconv"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+func Middleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		path := r.URL.Path
+
+		timer := prometheus.NewTimer(httpDuration.With(prometheus.Labels{
+			labelPath: path,
+		}))
+		rw := newResponseWriter(w)
+		next.ServeHTTP(rw, r)
+		if rw.statusCode == 0 {
+			rw.WriteHeader(http.StatusOK)
+		}
+		statusCode := rw.statusCode
+
+		responseStatus.With(prometheus.Labels{
+			labelPath:   path,
+			labelStatus: strconv.Itoa(statusCode),
+		}).Inc()
+		totalRequests.With(prometheus.Labels{
+			labelPath: path,
+		}).Inc()
+
+		log.Printf("%s %s %s %d %s", r.RemoteAddr, r.Method, r.URL.Path, statusCode, timer.ObserveDuration())
+	})
+}