Carubbi.ResilientFlurl

Overview

Carubbi.ResilientFlurl is a library designed to enhance resilience in HTTP client communications within your .NET applications. It simplifies the setup of resilient HTTP clients by providing a straightforward way to configure standard and custom resilience pipelines using policies such as Retry, Circuit Breaker, Concurrency Limiter, and Timeout. Additionally, it integrates with FlurlClient to provide enhanced capabilities for HTTP requests.

Getting Started

1. Installation

   • Install the Carubbi.ResilientFlurl NuGet package in your project:

     Install-Package Carubbi.ResilientFlurl
     

2. Setup

   • In your project's startup or configuration class (e.g., Startup.cs in a typical ASP.NET Core application), add resilient HTTP clients using the AddResilientHttpClient method provided by Carubbi.ResilientFlurl. For each client class you want to configure, call:

     builder.Services.AddResilientHttpClient<ClientA>(configuration);
     builder.Services.AddResilientHttpClient<ClientB>(configuration);

     Replace ClientA and ClientB with the actual client classes you have in your project.

3. Configuration

   • Configure the pipeline policies for each client in the appsettings.json file under respective client names (ClientA, ClientB, etc.):

     {
       "ClientA": {
         "HttpClient": {
           "BaseAddress": "https://localhost:7277/",
           "UseStandardResiliencePipeline": true
         }
       },
       "ClientB": {
         "HttpClient": {
           "BaseAddress": "https://localhost:7276/",
           "CustomResiliencePipeline": [
             {
               "Policy": "ConcurrencyLimiter",
               "Parameters": {
                 "MaxConcurrentCalls": 10
               }
             },
             {
               "Policy": "Timeout",
               "Parameters": {
                 "TimeoutInSeconds": 15
               }
             },
             {
               "Policy": "Retry",
               "Parameters": {
                 "MaxAttempts": 10,
                 "DelayInSeconds": 2
               }
             },
             {
               "Policy": "CircuitBreaker",
               "Parameters": {
                 "DurationInSeconds": 30,
                 "SamplingDurationInSeconds": 60,
                 "FailureRatio": 50,
                 "MinimumThroughput": 1000
               }
             }
           ]
         }
       }
     }

4. Usage

   • After setup, inject the configured HttpClient instances into your services or controllers using the IHttpClientFactory. The Carubbi.ResilientFlurl library will handle the resilience policies based on the configurations provided.
   • Additionally, each configured HttpClient includes an associated FlurlClient, allowing you to leverage Flurl's fluent interface for making HTTP requests.

Configuration Details

• BaseAddress: Specifies the base URL for the HTTP client.
• UseStandardResiliencePipeline: If set to true, uses the standard resilience pipeline which includes default policies.
• CustomResiliencePipeline: Allows defining a custom set of resilience policies for fine-grained control over retries, timeouts, concurrency limits, and circuit breaking.
  • Policies available:
    • Retry: Retries failed requests according to specified parameters (MaxAttempts, DelayInSeconds).
    • Timeout: Sets a maximum time duration for requests (TimeoutInSeconds).
    • ConcurrencyLimiter: Limits concurrent requests (MaxConcurrentCalls).
    • CircuitBreaker: Prevents requests from being sent to a service that is likely to fail (DurationInSeconds, SamplingDurationInSeconds, FailureRatio, MinimumThroughput).

Additional Notes

• Ensure that the appsettings.json file is correctly structured and that policies are configured appropriately for each client.
• You can mix and match standard and custom resilience pipelines across different clients in your application based on their specific needs.

License

This library is licensed under the MIT License. See the LICENSE file for more details.

For more information and updates, visit the Carubbi.ResilientFlurl GitHub repository.

For usage example check the demo repository