private TResponse DoActionWithExponentialBackoff <TResponse>(CalendarBaseServiceRequest <TResponse> request, HttpStatusCode[] otherAllowedCodes, HttpStatusCode[] otherBackoffCodes)
{
int delay = 100;
while (delay < 1000) //If the delay gets above 1 second, give up
{
try
{
return(request.Execute());
}
catch (GoogleApiException ex)
{
if (ex.HttpStatusCode == HttpStatusCode.Forbidden || //Rate limit exceeded
ex.HttpStatusCode == HttpStatusCode.ServiceUnavailable || //Backend error
ex.HttpStatusCode == HttpStatusCode.NotFound ||
ex.Message.Contains("That’s an error") || //Handles the Google error pages like https://i.imgur.com/lFDKFro.png
otherAllowedCodes.Contains(ex.HttpStatusCode))
{
Common.Log($"Request failed. Waiting {delay} ms before trying again");
Thread.Sleep(delay);
delay += 100;
}
else
{
throw;
}
}
}
throw new Exception("Retry attempts failed");
}
/// <summary>Execute asyncronius request.</summary>
/// <typeparam name="T">The type of the request result.</typeparam>
protected virtual Task <T> ExecuteAsync <T>(CalendarBaseServiceRequest <T> request)
where T : class
{
return(request.ExecuteAsync());
}
private TResponse DoActionWithExponentialBackoff <TResponse>(CalendarBaseServiceRequest <TResponse> request)
{
return(DoActionWithExponentialBackoff(request, new HttpStatusCode[0], new HttpStatusCode[0]));
}
protected override Task <T> ExecuteAsync <T>(CalendarBaseServiceRequest <T> request) => Task.FromResult((T)_action());
