Flexible retry library for Dio package. This is a next generation of an abandoned dio_retry
package.
By default, the request will be retried only for appropriate retryable http statuses.
Also, it supports dynamic delay between retries.
Null Safety.
- Add package to pubspec.yaml:
dio_smart_retry: ^5.0.0
** - Import package:
import 'package:dio_smart_retry/dio_smart_retry.dart'
** For the old dio (ver. 4.+) use dio_smart_retry: ^1.4.0
Just add an interceptor to your dio:
final dio = Dio();
// Add the interceptor
dio.interceptors.add(RetryInterceptor(
dio: dio,
logPrint: print, // specify log function (optional)
retries: 3, // retry count (optional)
retryDelays: const [ // set delays between retries (optional)
Duration(seconds: 1), // wait 1 sec before first retry
Duration(seconds: 2), // wait 2 sec before second retry
Duration(seconds: 3), // wait 3 sec before third retry
],
));
/// Sending a failing request for 3 times with 1s, then 2s, then 3s interval
await dio.get('https://mock.codes/500');
See example/dio_smart_retry_example.dart
.
Responses with these http status codes will be retried by default:
- 408: RequestTimeout
- 429: TooManyRequests
- 500: InternalServerError
- 502: BadGateway
- 503: ServiceUnavailable
- 504: GatewayTimeout
- 440: LoginTimeout (IIS)
- 460: ClientClosedRequest (AWS Elastic Load Balancer)
- 499: ClientClosedRequest (ngnix)
- 520: WebServerReturnedUnknownError
- 521: WebServerIsDown
- 522: ConnectionTimedOut
- 523: OriginIsUnreachable
- 524: TimeoutOccurred
- 525: SSLHandshakeFailed
- 527: RailgunError
- 598: NetworkReadTimeoutError
- 599: NetworkConnectTimeoutError It's possible to override this list
It's possible to manually disable retry for a specified request. Use disableRetry
extension for that:
final request = RequestOptions(path: '/')
..disableRetry = true;
await dio.fetch<String>(request);
or
final options = Options()
..disableRetry = true;
await dio.get<String>('/', options: options);
It's possible to add you own retryable status codes. Use retryableExtraStatuses
parameter for that. Here is an example:
RetryInterceptor(
dio: dio,
retryableExtraStatuses: { status401Unauthorized },
)
or:
RetryInterceptor(
dio: dio,
retryableExtraStatuses: { 401 },
)
It's possible to override default retryable status codes list. Just make new instance of DefaultRetryEvaluator
and pass your status codes there.
Here is an example:
final myStatuses = { status400BadRequest, status409Conflict };
dio.interceptors.add(
RetryInterceptor(
dio: dio,
logPrint: print,
retryEvaluator: DefaultRetryEvaluator(myStatuses).evaluate,
),
);
await dio.get<dynamic>('https://mock.codes/400');
Because dio's class for multipart data MultipartFile
doesn't support stream rewinding (recreation) to support retry for multipart data you should use a class MultipartFileRecreatable
instead of MultipartFile
.
Here is an example:
final formData =
FormData.fromMap({'file': MultipartFileRecreatable.fromFileSync('README.md')});
await dio.post<dynamic>(
'https://multipart.free.beeceptor.com/post500',
data: formData,
);
See the full example in the test: https://github.com/rodion-m/dio_smart_retry/blob/63a3bddae8b5a0581c35c4ae5e973996561d9100/test/multipart_retry_tests.dart#L32-L61
Version 6.0 introduces 2 breaking changes:
MultipartFileRecreatable.filename
is now a named parameterMultipartFileRecreatable.filePath
is now removed
To update to the latest version, if you were using the MultipartFileRecreatable
constructor, remove the filePath
parameter and change filename
to a named parameter:
Old:
return MultipartFileRecreatable(
stream,
length,
filename,
filePath,
);
New:
return MultipartFileRecreatable(
stream,
length,
filename: filename,
);