public static async Task <T> WithRetriesAsync <T>(Func <Task <T> > action, int maxAttempts = 5, TimeSpan?retryInterval = null, CancellationToken cancellationToken = default, ILogger logger = null)
{
if (action == null)
{
throw new ArgumentNullException(nameof(action));
}
int attempts = 1;
var startTime = SystemClock.UtcNow;
int currentBackoffTime = _defaultBackoffIntervals[0];
if (retryInterval != null)
{
currentBackoffTime = (int)retryInterval.Value.TotalMilliseconds;
}
do
{
if (attempts > 1 && logger != null && logger.IsEnabled(LogLevel.Information))
{
logger.LogInformation("Retrying {Attempts} attempt after {Delay:g}...", attempts.ToOrdinal(), SystemClock.UtcNow.Subtract(startTime));
}
try {
return(await action().AnyContext());
} catch (Exception ex) {
if (attempts >= maxAttempts)
{
throw;
}
if (logger != null && logger.IsEnabled(LogLevel.Error))
{
logger.LogError(ex, "Retry error: {Message}", ex.Message);
}
await SystemClock.SleepSafeAsync(currentBackoffTime, cancellationToken).AnyContext();
}
if (retryInterval == null)
{
currentBackoffTime = _defaultBackoffIntervals[Math.Min(attempts, _defaultBackoffIntervals.Length - 1)];
}
attempts++;
} while (attempts <= maxAttempts && !cancellationToken.IsCancellationRequested);
throw new TaskCanceledException("Should not get here.");
}
