add logging middleware to push service (#262)

push/logging_service.go

@@ -0,0 +1,34 @@
+package push
+
+import (
+	"context"
+	"time"
+
+	"github.com/go-kit/kit/log"
+)
+
+type loggingMiddleware struct {
+	logger log.Logger
+	next   Service
+}
+
+func NewLoggingService(svc Service, logger log.Logger) loggingMiddleware {
+	return loggingMiddleware{
+		next:   svc,
+		logger: logger,
+	}
+}
+
+func (mw loggingMiddleware) Push(ctx context.Context, udid string) (id string, err error) {
+	defer func(begin time.Time) {
+		_ = mw.logger.Log(
+			"method", "Push",
+			"udid", udid,
+			"err", err,
+			"took", time.Since(begin),
+		)
+	}(time.Now())
+
+	id, err = mw.next.Push(ctx, udid)
+	return
+}