Retry for dart #

This package provides an easy way to retry asynchronous functions. This is often useful to avoid crashing on intermittent errors such as broken connections or temporarily overloaded servers.

Disclaimer: This is not an officially supported Google product.

Using retry #

For simple retry logic with exponential back-off use the retry function provided by this package.

import 'package:retry/retry.dart';

final response = await retry(
  // Make a GET request
  () => http.get('https://google.com').timeout(Duration(seconds: 5)),
  // Retry on SocketException or TimeoutException
  retryIf: (e) => e is SocketException || e is TimeoutException,
);
print(response.body);

Defaults to 8 attempts, sleeping as following after 1st, 2nd, 3rd, ..., 7th attempt:

1. 400 ms +/- 25%
2. 800 ms +/- 25%
3. 1600 ms +/- 25%
4. 3200 ms +/- 25%
5. 6400 ms +/- 25%
6. 12800 ms +/- 25%
7. 25600 ms +/- 25%

Using RetryOptions #

This package provides RetryOptions which defined how many times to retry an function and how long to sleep between retries.

final r = RetryOptions(attempts: 8);
final response = await r.retry(
  // Make a GET request
  () => http.get('https://google.com').timeout(Duration(seconds: 5)),
  // Retry on SocketException or TimeoutException
  retryIf: (e) => e is SocketException || e is TimeoutException,
);
print(response.body);