.net core Polly断路器未与.net core HTTP客户端保持状态
我已经实施了polly重试和断路器策略(wrapped)。当呼叫失败且前一次呼叫的电路开路时,下一次呼叫将再次转到重试并再次点击断路器,而不是仅仅抛出断路器异常。我认为,尽管我使用的是类型化的客户机,HTTP客户机还是在重新创建。我无法理解这个问题。这是密码 启动.net core Polly断路器未与.net core HTTP客户端保持状态,.net-core,startup,dotnet-httpclient,polly,circuit-breaker,.net Core,Startup,Dotnet Httpclient,Polly,Circuit Breaker,我已经实施了polly重试和断路器策略(wrapped)。当呼叫失败且前一次呼叫的电路开路时,下一次呼叫将再次转到重试并再次点击断路器,而不是仅仅抛出断路器异常。我认为,尽管我使用的是类型化的客户机,HTTP客户机还是在重新创建。我无法理解这个问题。这是密码 启动 public void ConfigureServices(IServiceCollection services) { services.AddMvc().SetCompatibilityVersio
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
services.AddHttpClient<IIntCall, IntCall>().WrapResilientPolicies();
}
public void配置服务(IServiceCollection服务)
{
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
services.AddHttpClient().wrapResilientPolicys();
}
接口
public interface IIntCall
{
Task<bool> DoSomething();
}
公共接口IIntCall
{
任务DoSomething();
}
实施:
public class IntCall : IIntCall
{
private readonly HttpClient client;
public IntCall(HttpClient httpClient)
{
this.client = httpClient;
}
public async Task<bool> DoSomething()
{
var response = await client.GetAsync("http://www.onegoogle.com");
var content = await response.Content.ReadAsStringAsync();
return false;
}
}
公共类IntCall:IIntCall
{
私有只读HttpClient;
公共IntCall(HttpClient HttpClient)
{
this.client=httpClient;
}
公共异步任务DoSomething()
{
var response=wait client.GetAsync(“http://www.onegoogle.com");
var content=await response.content.ReadAsStringAsync();
返回false;
}
}
波利实现
public static class CBExtensions
{
public static void WrapResilientPolicies(this IHttpClientBuilder builder)
{
builder.AddPolicyHandler((service, request) =>
GetRetryPolicy().WrapAsync(GetCircuitBreakerPolicy()));
}
private static IAsyncPolicy<HttpResponseMessage> GetCircuitBreakerPolicy()
{
return HttpPolicyExtensions.HandleTransientHttpError()
.CircuitBreakerAsync(3, TimeSpan.FromSeconds(30), (result, retryAttempt) =>
{
Debug.WriteLine("circuit broken");
},
() =>
{
Debug.WriteLine("circuit closed");
});
}
private static IAsyncPolicy<HttpResponseMessage> GetRetryPolicy()
{
return HttpPolicyExtensions.HandleTransientHttpError()
.Or<Exception>(e => !(e is BrokenCircuitException))
.WaitAndRetryAsync(3,
retryAttempt => TimeSpan.FromMilliseconds(500),
onRetry: (context, attempt) =>
{
Debug.WriteLine("error");
}
);
}
}
公共静态类扩展
{
公共静态无效WrapResilientPolicys(此IHttpClientBuilder生成器)
{
builder.AddPolicyHandler((服务、请求)=>
GetRetryPolicy().WrapAsync(GetCircuitBreakerPolicy());
}
私有静态IAsyncPolicy GetCircuitBreakerPolicy()
{
返回HttpPolicyExtensions.HandletTransientHttpError()
.CircuitBreakerAsync(3,TimeSpan.FromSeconds(30),(结果,重试尝试)=>
{
调试。写入线(“电路断路”);
},
() =>
{
调试写入线(“电路闭合”);
});
}
私有静态IAsyncPolicy GetRetryPolicy()
{
返回HttpPolicyExtensions.HandletTransientHttpError()
.或(e=>!(e是BrokenCircuiteException))
WaitandertryAsync先生(3,
RetryTest=>TimeSpan.From毫秒(500),
onRetry:(上下文,尝试)=>
{
Debug.WriteLine(“错误”);
}
);
}
}
我发现了问题所在。因为我正在获取请求详细信息,所以每次调用都会注入策略,因此状态会被更新。我把代码从
public static void WrapResilientPolicies(this IHttpClientBuilder builder)
{
builder.AddPolicyHandler((service, request) =>
GetRetryPolicy().WrapAsync(GetCircuitBreakerPolicy()));
}
对此
public static void WrapResilientPolicies(this IHttpClientBuilder builder)
{
builder.AddPolicyHandler(
GetRetryPolicy().WrapAsync(GetCircuitBreakerPolicy()));
}
+1.对于任何需要更多解释的人,Polly和HttpClientFactory文档包括以下内容: