Retry on TOOMANYREQUESTS error from ECR (#750)

* Retry on TOOMANYREQUESTS error from ECR

* use a set instead

Author: jchorl

pkg/v1/remote/transport/error.go

@@ -89,8 +89,7 @@ func (e *Error) Temporary() bool {
 		return false
 	}
 	for _, d := range e.Errors {
-		// TODO: Include other error types.
-		if d.Code != BlobUploadInvalidErrorCode {
+		if _, ok := temporaryErrorCodes[d.Code]; !ok {
 			return false
 		}
 	}
@@ -149,8 +148,15 @@ const (
 	UnauthorizedErrorCode        ErrorCode = "UNAUTHORIZED"
 	DeniedErrorCode              ErrorCode = "DENIED"
 	UnsupportedErrorCode         ErrorCode = "UNSUPPORTED"
+	TooManyRequestsErrorCode     ErrorCode = "TOOMANYREQUESTS"
 )
 
+// TODO: Include other error types.
+var temporaryErrorCodes = map[ErrorCode]struct{}{
+	BlobUploadInvalidErrorCode: struct{}{},
+	TooManyRequestsErrorCode:   struct{}{},
+}
+
 // CheckError returns a structured error if the response status is not in codes.
 func CheckError(resp *http.Response, codes ...int) error {
 	for _, code := range codes {

pkg/v1/remote/transport/error_test.go

@@ -50,6 +50,13 @@ func TestTemporary(t *testing.T) {
 			}},
 		},
 		retry: false,
+	}, {
+		error: &Error{
+			Errors: []Diagnostic{{
+				Code: TooManyRequestsErrorCode,
+			}},
+		},
+		retry: true,
 	}}
 
 	for _, test := range tests {