I have an API that has certain limits defined. Since I have used Polly C# library to limit the calls made to API. Below is the policy I am using.

var _rateLimitPolicy = Policy.RateLimitAsync(10,TimeSpan.FromSeconds(1), 5);

var _retryPolicy = Policy
           .Handle<RateLimitRejectedException>(e => e.RetryAfter > TimeSpan.Zero)
           .WaitAndRetryAsync(
               retryCount: 3,
               sleepDurationProvider: (i, e, ctx) =>
               {
                   var rle = (RateLimitRejectedException)e;
                   return rle.RetryAfter;
               },
               onRetryAsync: (e, ts, i, ctx) => Task.CompletedTask
           );

_wrappedPolicies = Policy.WrapAsync(_retryPolicy, _rateLimitPolicy);

Currently, once the retry limit of 3 is exceeded it throws RateLimitRejectedException. I want to throw a custom error if the retry limit is exceeded. Does anyone know how to do it?

CodePudding user response：

If you want to throw an exception then use System.Exception with an if statement

So:

if(retryLimit>3)
{
    throw new System.Exception("Retry Limit exceeded 3.");
}

If you don't wish to interrupt the process with a thrown exception, you can use a try{}catch(Exception e){} too

CodePudding user response：

Whenever you want to execute your _wrappedPolicies
then you can call ExecuteAsync and ExecuteAndCaptureAsync methods.

• Former throws the original exception in case of retry
• Latter captures the result in a PolicyResult both in failure and success cases as well

PolicyResult policyExecutionResult = await _wrappedPolicies.ExecuteAndCaptureAsync(...);

On this result object there is a property called FinalException. You can examine that and based on the assessment result you can throw a custom exception

if (policyExecutionResult.FinalExecption is RateLimitRejectedException)
   throw new CustomException(...);