Futurum.Core.Polly

Small dotnet library, allowing you to use Polly with Futurum.Core, based on the concepts behind 'Railway Oriented Programming'.

Try

Try to run func, using the Polly policy. If the policy fails, the failing result will be returned as a failure.

var result = await ResultPolly.TryAsync(func, () => ERROR_MESSAGE, pollyPolicy);

ThenTry

Combines Result.Then with ResultPolly.Try

var outputResult = await inputResult.ThenTryAsync(func, () => ERROR_MESSAGE, pollyPolicy);

HandleResult

Create a policy to handle Result

Policy.Handle<Exception>()
      .HandleResult()

HandleResult<T>

Create a policy to handle Result<T>

Policy.Handle<Exception>()
      .HandleResult<string>()

DelegateResult extensions

GetErrorMessage

Get the error message either from the Exception or the Result / Result<T>

var errorMessage = delegateResult.GetErrorMessage()

_pollyPolicy = Policy.Handle<Exception>()
                     .HandleResult<string>()
                     .WaitAndRetryAsync(new []{TimeSpan.FromSeconds(5), },
                                        (delegateResult, timeSpan, retryCount, context) =>
                                        {
                                            var error = delegateResult.GetErrorMessage();
                                            
                                            _logger.LogWarning("Retry - retryCount: '{RetryCount}'. Error : '{Error}'", retryCount, error);
                                        });

DelegateResult GetErrorMessageSafe

Get the safe error message either from the Exception or the Result / Result<T>

var errorMessage = delegateResult.GetErrorMessageSafe()

_pollyPolicy = Policy.Handle<Exception>()
                     .HandleResult<string>()
                     .WaitAndRetryAsync(new []{TimeSpan.FromSeconds(5), },
                                        (delegateResult, timeSpan, retryCount, context) =>
                                        {
                                            var error = delegateResult.GetErrorMessageSafe();
                                            
                                            _logger.LogWarning("Retry - retryCount: '{RetryCount}'. Error : '{Error}'", retryCount, error);
                                        });