Apizr

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Refit based web api client management, but resilient (retry, connectivity, cache, auth, log, priority, etc...)

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# Apizr

Refit based web api client management, but resilient (retry, connectivity, cache, auth, log, priority, etc...)

[![Read - Documentation](https://img.shields.io/badge/read-documentation-blue?style=for-the-badge)](https://apizr.net "Go to project documentation") [![Watch - Tutorials](https://img.shields.io/badge/YouTube-red?style=for-the-badge&logo=youtube&logoColor=white)](https://www.youtube.com/playlist?list=PLP7ES6CZYy_3zYjmOJzi3K_GZlViorgUO "Watch tutorial videos")

## What

The Apizr project was motivated by this [2015 famous blog post](https://github.com/RobGibbens/ResilientServices/blob/master/post/post.md) about resilient networking.

Its main focus was to address at least everything explained into this article, meanning:

- Easy access to restful services
- Work offline with cache management
- Handle errors with retry pattern and global catching
- Handle request priority
- Check connectivity
- Fast development time
- Easy maintenance
- Reuse existing libraries

But also, some more core features like:

- Trace http traffic
- Handle authentication

And more integration/extension independent optional features like:

- Choose cache, log and connectivity providers
- Register it as an MS DI extension
- Map model with DTO
- Use Mediator pattern
- Manage file transfers

The list is not exhaustive, there’s more, but what we wanted was playing with all of it with as less code as we could, not worrying about plumbing things and being sure everything is wired and handled by design or almost.

Inspired by [Refit.Insane.PowerPack](https://github.com/thefex/Refit.Insane.PowerPack), we wanted to make it simple to use, mixing attribute decorations and fluent configuration.

## How

An api definition with some attributes:
```csharp
// (Polly) Define a resilience pipeline key
// OR use Microsoft Resilience instead
[assembly:ResiliencePipeline("TransientHttpError")]
namespace Apizr.Sample
{
    // (Apizr) Define your web api base url and ask for cache and logs
    [BaseAddress("https://reqres.in/"), 
    Cache(CacheMode.FetchOrGet, "01:00:00"), 
    Log(HttpMessageParts.AllButBodies)]
    public interface IReqResService
    {
        // (Refit) Define your web api interface methods
        [Get("/api/users")]
        Task<UserList> GetUsersAsync([RequestOptions] IApizrRequestOptions options);

[Get("/api/users/{userId}")]
        Task<UserDetails> GetUserAsync([CacheKey] int userId, [RequestOptions] IApizrRequestOptions options);

[Post("/api/users")]
        Task<User> CreateUser(User user, [RequestOptions] IApizrRequestOptions options);
    }
}
```

Some resilience strategies:
```csharp
// (Polly) Create a resilience pipeline (if not using Microsoft Resilience)
var resiliencePipelineBuilder = new ResiliencePipelineBuilder<HttpResponseMessage>()
    .AddRetry(
        new RetryStrategyOptions<HttpResponseMessage>
        {
            ShouldHandle = new PredicateBuilder<HttpResponseMessage>()
                .Handle<HttpRequestException>()
                .HandleResult(response =>
                    response.StatusCode is >= HttpStatusCode.InternalServerError
                        or HttpStatusCode.RequestTimeout),
            Delay = TimeSpan.FromSeconds(1),
            MaxRetryAttempts = 3,
            UseJitter = true,
            BackoffType = DelayBackoffType.Exponential
        });
```

An instance of this managed api:

### [Extended](#tab/tabid-extended)

Relies on `IServiceCollection` extension methods approach.

```csharp
// (Logger) Configure logging the way you want, like
services.AddLogging(loggingBuilder => loggingBuilder.AddDebug());

// (Apizr) Add an Apizr manager for the defined api to your container
services.AddApizrManagerFor<IReqResService>(
    options => options
        // With a cache handler
        .WithAkavacheCacheHandler()
        // If using Microsoft Resilience
        .ConfigureHttpClientBuilder(builder => builder
            .AddStandardResilienceHandler()));

// (Polly) Add the resilience pipeline (if not using Microsoft Resilience)
services.AddResiliencePipeline<string, HttpResponseMessage>("TransientHttpError",
    builder => builder.AddPipeline(resiliencePipelineBuilder.Build()));
...

// (Apizr) Get your manager instance the way you want, like
var reqResManager = serviceProvider.GetRequiredService<IApizrManager<IReqResService>>();
```

### [Static](#tab/tabid-static)

Relies on static builder instantiation approach.

```csharp
// (Polly) Add the resilience pipeline with its key to a registry
var resiliencePipelineRegistry = new ResiliencePipelineRegistry<string>();
resiliencePipelineRegistry.TryAddBuilder<HttpResponseMessage>("TransientHttpError", 
    (builder, _) => builder.AddPipeline(resiliencePipelineBuilder.Build()));

// (Apizr) Get your manager instance
var reqResManager = ApizrBuilder.Current.CreateManagerFor<IReqResService>(
    options => options
        // With a logger
        .WithLoggerFactory(LoggerFactory.Create(loggingBuilder =>
            loggingBuilder.Debug()))
        // With the defined resilience pipeline registry
        .WithResiliencePipelineRegistry(resiliencePipelineRegistry)
        // And with a cache handler
        .WithAkavacheCacheHandler());
```

***

And then you're good to go:
```csharp
var userList = await reqResManager.ExecuteAsync((api, opt) => api.GetUsersAsync(opt));
```

This request will be managed with the defined resilience strategies, data cached and all logged.

Apizr has a lot more to offer, just [read the doc](https://apizr.net/articles/index.md)!

- Please read the [Change Log](https://apizr.net/changelog.md) to get a picture of what's in.
- Please read the [Breaking changes](https://apizr.net/articles/breakingchanges.md) to get a picture of what's changed.
- Please watch the Getting Started video:

[![Getting Started](https://img.youtube.com/vi/9qXekjZepLA/0.jpg)](https://www.youtube.com/watch?v=9qXekjZepLA)

## Where

### Managing (Core)

|Project|Current|Upcoming|
|-------|-----|-----|
|Apizr|[![NuGet](https://img.shields.io/nuget/v/Apizr.svg)](https://www.nuget.org/packages/Apizr/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/Apizr.svg)](https://www.nuget.org/packages/Apizr/)|
|Apizr.Extensions.Microsoft.DependencyInjection|[![NuGet](https://img.shields.io/nuget/v/Apizr.Extensions.Microsoft.DependencyInjection.svg)](https://www.nuget.org/packages/Apizr.Extensions.Microsoft.DependencyInjection/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/Apizr.Extensions.Microsoft.DependencyInjection.svg)](https://www.nuget.org/packages/Apizr.Extensions.Microsoft.DependencyInjection/)|

### Caching

|Project|Current|Upcoming|
|-------|-----|-----|
|Apizr.Extensions.Microsoft.Caching|[![NuGet](https://img.shields.io/nuget/v/Apizr.Extensions.Microsoft.Caching.svg)](https://www.nuget.org/packages/Apizr.Extensions.Microsoft.Caching/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/Apizr.Extensions.Microsoft.Caching.svg)](https://www.nuget.org/packages/Apizr.Extensions.Microsoft.Caching/)|
|Apizr.Integrations.Akavache|[![NuGet](https://img.shields.io/nuget/v/Apizr.Integrations.Akavache.svg)](https://www.nuget.org/packages/Apizr.Integrations.Akavache/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/Apizr.Integrations.Akavache.svg)](https://www.nuget.org/packages/Apizr.Integrations.Akavache/)|
|Apizr.Integrations.MonkeyCache|[![NuGet](https://img.shields.io/nuget/v/Apizr.Integrations.MonkeyCache.svg)](https://www.nuget.org/packages/Apizr.Integrations.MonkeyCache/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/Apizr.Integrations.MonkeyCache.svg)](https://www.nuget.org/packages/Apizr.Integrations.MonkeyCache/)|

### Handling
|Project|Current|Upcoming|
|-------|-----|-----|
|Apizr.Integrations.Fusillade|[![NuGet](https://img.shields.io/nuget/v/Apizr.Integrations.Fusillade.svg)](https://www.nuget.org/packages/Apizr.Integrations.Fusillade/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/Apizr.Integrations.Fusillade.svg)](https://www.nuget.org/packages/Apizr.Integrations.Fusillade/)|
|Apizr.Integrations.MediatR|[![NuGet](https://img.shields.io/nuget/v/Apizr.Integrations.MediatR.svg)](https://www.nuget.org/packages/Apizr.Integrations.MediatR/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/Apizr.Integrations.MediatR.svg)](https://www.nuget.org/packages/Apizr.Integrations.MediatR/)|

### Mapping

|Project|Current|Upcoming|
|-------|-----|-----|
|Apizr.Integrations.AutoMapper|[![NuGet](https://img.shields.io/nuget/v/Apizr.Integrations.AutoMapper.svg)](https://www.nuget.org/packages/Apizr.Integrations.AutoMapper/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/Apizr.Integrations.AutoMapper.svg)](https://www.nuget.org/packages/Apizr.Integrations.AutoMapper/)|
|Apizr.Integrations.Mapster|[![NuGet](https://img.shields.io/nuget/v/Apizr.Integrations.Mapster.svg)](https://www.nuget.org/packages/Apizr.Integrations.Mapster/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/Apizr.Integrations.Mapster.svg)](https://www.nuget.org/packages/Apizr.Integrations.Mapster/)|

### Transferring

|Project|Current|Upcoming|
|-------|-----|-----|
|Apizr.Integrations.FileTransfer|[![NuGet](https://img.shields.io/nuget/v/Apizr.Integrations.FileTransfer.svg)](https://www.nuget.org/packages/Apizr.Integrations.FileTransfer/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/Apizr.Integrations.FileTransfer.svg)](https://www.nuget.org/packages/Apizr.Integrations.FileTransfer/)|
|Apizr.Extensions.Microsoft.FileTransfer|[![NuGet](https://img.shields.io/nuget/v/Apizr.Integrations.FileTransfer.svg)](https://www.nuget.org/packages/Apizr.Integrations.FileTransfer/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/Apizr.Integrations.FileTransfer.svg)](https://www.nuget.org/packages/Apizr.Integrations.FileTransfer/)|
|Apizr.Integrations.FileTransfer.MediatR|[![NuGet](https://img.shields.io/nuget/v/Apizr.Integrations.FileTransfer.svg)](https://www.nuget.org/packages/Apizr.Integrations.FileTransfer/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/Apizr.Integrations.FileTransfer.svg)](https://www.nuget.org/packages/Apizr.Integrations.FileTransfer/)|

### Generating

|Project|Current|Upcoming|
|-------|-----|-----|
|Refitter|[![NuGet](https://img.shields.io/nuget/v/refitter.svg)](https://www.nuget.org/packages/refitter/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/refitter.svg)](https://www.nuget.org/packages/refitter/)|
|Refitter.SourceGenerator|[![NuGet](https://img.shields.io/nuget/v/refitter.sourcegenerator.svg)](https://www.nuget.org/packages/refitter.sourcegenerator/)|[![NuGet Pre Release](https://img.shields.io/nuget/vpre/refitter.sourcegenerator.svg)](https://www.nuget.org/packages/refitter.sourcegenerator/)|

Install the NuGet reference package of your choice:

- **Apizr** package comes with the static builder instantiation approach (which you can register in your DI container then)
  - **Apizr.Extensions.Microsoft.DependencyInjection** package extends your IServiceCollection with AddApizr, AddApizrFor and AddApizrCrudFor registration methods
  - **Apizr.Extensions.Microsoft.Caching** package brings an ICacheHandler method mapping implementation for [MS Extensions Caching](https://www.nuget.org/packages/Microsoft.Extensions.Caching.Abstractions)
  - **Apizr.Integrations.Akavache** package brings an ICacheHandler method mapping implementation for [Akavache](https://github.com/reactiveui/Akavache)
  - **Apizr.Integrations.MonkeyCache** package brings an ICacheHandler method mapping implementation for [MonkeyCache](https://github.com/jamesmontemagno/monkey-cache)
  - **Apizr.Integrations.Fusillade** package enables request priority management using [Fusillade](https://github.com/reactiveui/Fusillade)
  - **Apizr.Integrations.MediatR** package enables request auto handling with mediation using [MediatR](https://github.com/jbogard/MediatR)
  - **Apizr.Integrations.AutoMapper** package enables data mapping using [AutoMapper](https://github.com/AutoMapper/AutoMapper)
  - **Apizr.Integrations.Mapster** package enables data mapping using [Mapster](https://github.com/MapsterMapper/Mapster)
  - **Apizr.Integrations.FileTransfer** package enables file transfer management for static registration
  - **Apizr.Extensions.Microsoft.FileTransfer** package enables file transfer management for extended registration
  - **Apizr.Integrations.FileTransfer.MediatR** package enables file transfer management for mediation requests (requires MediatR integration) using [MediatR](https://github.com/jbogard/MediatR)

Choose which generating approach suites to your needs by installing either:
  - Refitter [.NET CLI Tool](https://refitter.github.io/articles/cli-tool.md) distributed via [nuget.org](http://www.nuget.org/packages/refitter) that outputs a single C# file on disk
  - Refiiter [C# Source Generator](https://refitter.github.io/articles/source-generator.md) via the [Refitter.SourceGenerator](http://www.nuget.org/packages/refitter.sourcegenerator) package that generates code on compile time based on a [.refitter](https://refitter.github.io/articles/refitter-file-format.md) within the project directory.

Apizr core package make use of well known nuget packages to make the magic appear:

|Package|Features|
|-------|--------|
|[Refit](https://github.com/reactiveui/refit)|Auto-implement web api interface and deal with HttpClient|
|[Polly.Extensions](https://github.com/App-vNext/Polly)|Apply some policies like Retry, CircuitBreaker, etc...|
|[Microsoft.Extensions.Logging.Abstractions](https://github.com/BSiLabs/HttpTracer)|Delegate logging layer to MS Extensions Logging|

It also comes with some handling interfaces to let you provide your own services for:
- **Caching** with ICacheHandler, which comes with its default VoidCacheHandler (no cache), but also with:
  - InMemoryCacheHandler & DistributedCacheHandler: [MS Extensions Caching](https://www.nuget.org/packages/Microsoft.Extensions.Caching.Abstractions) methods mapping interface (Integration package referenced above), meaning you can provide any compatible caching engine
  - AkavacheCacheHandler: [Akavache](https://github.com/reactiveui/Akavache) methods mapping interface (Integration package referenced above)
  - MonkeyCacheHandler: [MonkeyCache](https://github.com/jamesmontemagno/monkey-cache) methods mapping interface (Integration package referenced above)
- **Logging** As Apizr relies on official [MS ILogger interface](https://www.nuget.org/packages/Microsoft.Extensions.Logging.Abstractions), you may want to provide any compatible logging engine (built-in DebugLogger activated by default)
- **Connectivity** with IConnectivityHandler, which comes with its default VoidConnectivityHandler (no connectivity check)
- **Mapping** with IMappingHandler, which comes with its default VoidMappingHandler (no mapping conversion), but also with:
  - AutoMapperMappingHandler: [AutoMapper](https://github.com/AutoMapper/AutoMapper) mapping methods mapping interface (Integration package referenced above)
  - MapsterMappingHandler: [Mapster](https://github.com/MapsterMapper/Mapster) mapping methods mapping interface (Integration package referenced above)

Apizr

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