/// <summary>
/// 添加降级功能
/// </summary>
/// <param name="polly"></param>
/// <param name="onFallBackMessage">发生降级时调用的应答内容</param>
/// <param name="onFallbackAsync">发生降级时触发</param>
/// <returns></returns>
public static IPollyBuilder AddFallBack(this IPollyBuilder polly, HttpResponseMessage onFallBackMessage, Func <DelegateResult <HttpResponseMessage>, Task> onFallbackAsync)
{
var content = Policy <HttpResponseMessage> .HandleInner <Exception>().FallbackAsync(onFallBackMessage, onFallbackAsync);
polly.HttpClientBuilder.AddPolicyHandler(content);
return(polly);
}
/// <summary>
/// 使用Polly默认策略
/// </summary>
/// <param name="services"></param>
/// <returns></returns>
public static IPollyBuilder UsePollyDefault(this IPollyBuilder services)
{
var provider = services.ServiceProvider.GetService <IOptions <PollyInfo> >();
var logger = services.ServiceProvider.GetService <ILogger <PollyInfo> >();
if (provider == null)
{
throw new ArgumentNullException("PollyInfo", Resource.you_must_add_polly_first);
}
var model = provider.Value;
services.AddFallBack(model.FallBackRespond.Convert(), async(s) =>
{
logger.LogWarning(s.Exception, model.FallBackRespond.Content);
await Task.CompletedTask;
});
services.AddCircuitBreakerAsync(model.CircuitBreaker.ToCloseCount, model.CircuitBreaker.RecoveryTimeSpan, (exc, span) =>
{
logger.LogWarning(exc.Exception, exc.Exception.Message);
logger.LogWarning(string.Format(Resource.opening_time, span));
logger.LogWarning(model.CircuitBreaker.Content);
}, () =>
{
logger.LogWarning(Resource.service_has_borken_down);
}, () => {
logger.LogWarning(Resource.service_is_half_open);
});
services.AddRetryAsync(model.RetryCount).AddTimeOutAsync(model.TimeOutTimeSpan);
return(services);
}
/// <summary>
/// 添加重试
/// </summary>
/// <param name="polly"></param>
/// <param name="retryCount">重试次数</param>
/// <returns></returns>
public static IPollyBuilder AddRetryAsync(this IPollyBuilder polly, int retryCount)
{
polly.HttpClientBuilder.AddPolicyHandler(Policy <HttpResponseMessage>
.Handle <Exception>()
.RetryAsync(retryCount));
return(polly);
}
/// <summary>
/// 添加超时策略
/// </summary>
/// <param name="polly"></param>
/// <param name="timeout">超时时间</param>
/// <returns></returns>
public static IPollyBuilder AddTimeOutAsync(this IPollyBuilder polly, TimeSpan timeout)
{
polly.HttpClientBuilder.AddPolicyHandler(Policy.TimeoutAsync <HttpResponseMessage>(timeout));
return(polly);
}
/// <summary>
/// 添加断路器策略
/// </summary>
/// <param name="polly"></param>
/// <param name="toCloseCount">开到关的错误次数</param>
/// <param name="recoveryTimeSpan">从关到开的时间间隔</param>
/// <param name="onBreak">当断路了发生</param>
/// <param name="onReset">当完全恢复时发生</param>
/// <param name="onHalfOpen">半开闭时发生</param>
/// <returns></returns>
public static IPollyBuilder AddCircuitBreakerAsync(this IPollyBuilder polly, int toCloseCount, TimeSpan recoveryTimeSpan, Action <DelegateResult <HttpResponseMessage>, TimeSpan> onBreak, Action onReset, Action onHalfOpen)
{
polly.HttpClientBuilder.AddPolicyHandler(Policy <HttpResponseMessage> .Handle <Exception>().CircuitBreakerAsync(toCloseCount, recoveryTimeSpan, onBreak, onReset, onHalfOpen));
return(polly);
}