如何在Azure Service Fabric应用程序中注入IHttpClientFactory？

Question

我试图在我的解决方案中使用IHttpClientFactory而不仅仅是HttpClient的实例。

startup.cs：

services.AddHttpClient("Test", client =>
{
    client.BaseAddress = new Uri("http://localhost:57863");
    client.Timeout = new TimeSpan(0, 0, 30);
    client.DefaultRequestHeaders.Clear();
});

在我需要HttpClient的服务中：

private readonly Uri _clusterLinuxUri;
private readonly IHttpClientFactory _clientFactory;
public LiasseService(ConfigSettings settings, IHttpClientFactory clientFactory)
{
    _clusterLinuxUri = new Uri($"{settings.LinuxClusterEndpoint}");
    _clientFactory = clientFactory;
}
public async Task<LiasseDetails> CreateLiasseAsync(LiasseCreate liasseData)
{
    using (var response = await _clientFactory.CreateClient("Test")
        .PostAsJsonAsync($"{_clusterLinuxUri}{_createPath}", liasseData))
    {
        await response.CheckHttpError($"{nameof(CreateLiasseAsync)} - error in CL");
        var detailsList = await response.Content.ReadAsAsync<LiasseDetailsList>();
        return detailsList.Details.FirstOrDefault();
    }
}

我没想到的部分是如何在Autofac中注入它。

Program.cs中

    private static void Main()
    {
        try
        {
            var builder = new ContainerBuilder();
            builder.RegisterModule(new GlobalAutofacModule());
            builder.RegisterServiceFabricSupport();
            builder.RegisterStatelessService<FacadeCore>("xxx.FacadeCoreType");

            using (builder.Build())
            {
                ServiceEventSource.Current.ServiceTypeRegistered(Process.GetCurrentProcess().Id, typeof(FacadeCore).Name);
                Thread.Sleep(Timeout.Infinite);
            }
        }
        catch (Exception e)
        {
            ServiceEventSource.Current.ServiceHostInitializationFailed(e.ToString());
            throw;
        }
    }


    public class GlobalAutofacModule : Module
    {
        protected override void Load(ContainerBuilder builder)
        {
            builder.RegisterType<ConfigSettings>();

            builder.RegisterType<PaymentService>().As<IPaymentService>();
            builder.RegisterType<MailerService>().As<IMailerService>();
            builder.RegisterType<LiasseService>().As<ILiasseService>();
            builder.RegisterType<AnalyseFinanciereService>().As<IAnalyseFinanciereService>();
            builder.RegisterType<ApimService>().As<IApimService>();

            builder.RegisterType<UserRepository>().As<IUserRepository>();
            builder.RegisterType<ApplicationProcessRepository>().As<IApplicationProcessRepository>();
            builder.RegisterType<LiasseRepository>().As<ILiasseRepository>();

            builder.RegisterType<CustomUserIdProvider>().As<IUserIdProvider>();
        }
    }

我是否应该创建一些实现IHttpClientFactory的自定义客户端以便能够注入它？我该怎么做？任何例子？谢谢。

Answer 1

请在这里查看Interface documentation

所以回答你的问题：

1）使用'ConfigureServices'方法中的IServiceCollection调用.AddHttpClient()

2）创建新的Autofac容器构建器并使用上面提到的IServiceCollection填充它

3）从ConfigureServices方法返回新的AutofacServiceProvider

public IServiceProvider ConfigureServices(IServiceCollection services)
{
   ...

   services.AddHttpClient();

   var containerBuilder = new ContainerBuilder();

   containerBuilder.Populate(services);

   var container = containerBuilder.Build();

   return new AutofacServiceProvider(container);
}

附：确保添加--Autofac.Extensions.DependencyInjection nuget包，以便能够使用AutofacServiceProvider类。