add middlewares

pkgs/middleware/handlerlog/log.go

@@ -0,0 +1,30 @@
+package handlerlog
+
+import (
+	"context"
+	"net/http"
+)
+
+type ctxKey int
+
+var (
+	key ctxKey = 0
+)
+
+func FindHandler(mux *http.ServeMux) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			ctx := r.Context()
+			if _, pattern := mux.Handler(r); pattern != "" {
+				ctx = context.WithValue(ctx, key, pattern)
+			}
+
+			next.ServeHTTP(w, r.WithContext(ctx))
+		})
+	}
+}
+
+func Pattern(r *http.Request) (string, bool) {
+	pattern, ok := r.Context().Value(key).(string)
+	return pattern, ok
+}