Dio Smart Retry

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.

Dio Smart Retry

Getting Started for Dio

Add package to pubspec.yaml: dio_smart_retry: ^7.0.0 **
Import package: import 'package:dio_smart_retry/dio_smart_retry.dart'

** For the old dio (ver. 4.+) use dio_smart_retry: ^1.4.0

Usage

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.

Default retryable status codes list

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

Disable retry

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);

final options = Options()
  ..disableRetry = true;
await dio.get<String>('/', options: options);

Add extra retryable status codes

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 },
)

Override retryable statuses

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');

Migrating to 7.0

Use MultipartFile instead of MultipartFileRecreatable.

Migrating to 6.0

Version 6.0 introduces 2 breaking changes:

MultipartFileRecreatable.filename is now a named parameter
MultipartFileRecreatable.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,
);