fix(storage): update gRPC retry codes (#8202)

RESOURCE_EXHAUSTED and INTERNAL should also be retryable for gRPC. See internal b/282880909

storage/invoke.go

@@ -136,12 +136,11 @@ func ShouldRetry(err error) bool {
 			return true
 		}
 	}
-	// HTTP 429, 502, 503, and 504 all map to gRPC UNAVAILABLE per
-	// https://grpc.github.io/grpc/core/md_doc_http-grpc-status-mapping.html.
-	//
-	// This is only necessary for the experimental gRPC-based media operations.
-	if st, ok := status.FromError(err); ok && st.Code() == codes.Unavailable {
-		return true
+	// UNAVAILABLE, RESOURCE_EXHAUSTED, and INTERNAL codes are all retryable for gRPC.
+	if st, ok := status.FromError(err); ok {
+		if code := st.Code(); code == codes.Unavailable || code == codes.ResourceExhausted || code == codes.Internal {
+			return true
+		}
 	}
 	// Unwrap is only supported in go1.13.x+
 	if e, ok := err.(interface{ Unwrap() error }); ok {

storage/invoke_test.go

@@ -72,6 +72,14 @@ func TestInvoke(t *testing.T) {
 			isIdempotentValue: true,
 			expectFinalErr:    true,
 		},
+		{
+			desc:              "retryable gRPC error is retried",
+			count:             1,
+			initialErr:        status.Error(codes.ResourceExhausted, "rate limit"),
+			finalErr:          nil,
+			isIdempotentValue: true,
+			expectFinalErr:    true,
+		},
 		{
 			desc:              "returns non-retryable error after retryable error",
 			count:             1,