[#184] Unify error handling

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

api/handler/util.go

@@ -0,0 +1,20 @@
+package handler
+
+import (
+	"net/http"
+
+	"github.com/nspcc-dev/neofs-s3-gw/api"
+	"go.uber.org/zap"
+)
+
+func (h *handler) logAndSendError(w http.ResponseWriter, logText string, reqInfo *api.ReqInfo, err error, additional ...zap.Field) {
+	fields := []zap.Field{zap.String("request_id", reqInfo.RequestID),
+		zap.String("method", reqInfo.API),
+		zap.String("bucket_name", reqInfo.BucketName),
+		zap.String("object_name", reqInfo.ObjectName),
+		zap.Error(err)}
+	fields = append(fields, additional...)
+
+	h.log.Error(logText, fields...)
+	api.WriteErrorResponse(w, reqInfo, err)
+}