/// <summary>
/// 强制熔断无法连通的EndPoint
/// </summary>
/// <param name="pathName"></param>
/// <param name="servcieInfo"></param>
/// <param name="breakEndPoint"></param>
public async Task ForcedCircuitBreakEndPoint(string flowControlCfgKey, ServiceConfigureInfo configure, IPEndPoint breakEndPoint)
{
var addr = configure.GetEndPoints().FirstOrDefault(x => x.GetEndPoint().Equals(breakEndPoint));
if (addr != null)
{
addr.BreakerTime = DateTime.Now;
}
await UpdateBreakerConfigure(flowControlCfgKey, configure);
}
/// <summary>
/// 通过配置组装熔断策略
/// </summary>
/// <param name="config"></param>
/// <returns></returns>
public IAsyncPolicy <T> BuildPolicy <T>(string key, ServiceConfigureInfo configure, IPEndPoint endpoint)
{
if (_lazyDefPolicy.Value.TryGetValue($"{key}{endpoint.ToString()}", out dynamic cachepolicy))
{
return(cachepolicy as IAsyncPolicy <T>);
}
else
{
var address = configure.GetEndPoints().FirstOrDefault(x => x.GetEndPoint().Equals(endpoint));
//定义默认策略
IAsyncPolicy <T> defPolicy = Policy <T> .Handle <Exception>().FallbackAsync(async(CancellationToken cancelToken) =>
{
//请求失败，更新配置节并进行回退
address.ThresholdBreakeTimes += 1;
tmpReqTime.Value.TryGetValue($"{key}{endpoint.ToString()}", out List <DateTime> time);
time = time ?? new List <DateTime>();
//若错误次数超过阈值或者阈值比例则触发熔断
if (address.ThresholdBreakeTimes >= configure.DefThresholdBreakeTimes || time.Count() == 0 || (time.Count() > 0 && (double)configure.DefThresholdBreakeRatePerSec >= (double)address.ThresholdBreakeTimes / (double)time.Count(y => y >= DateTime.Now.AddSeconds(1))))
{
_logger.LogError($"地址{address.GetEndPoint().ToString()}超过熔断阈值，强制熔断。详细信息{{当前IP熔断次数:{address.ThresholdBreakeTimes},成功请求次数:{time.Count()},熔断比率{(double)address.ThresholdBreakeTimes / (double)time.Count(y => y >= DateTime.Now.AddSeconds(1))}}}");
address.BreakerTime = DateTime.Now;
}
_logger.LogError($"地址{address.GetEndPoint().ToString()}请求出错,执行回退");
return(default);
/// <summary>
/// 检查服务断路状态
/// </summary>
/// <param name="pathName"></param>
/// <param name="serviceInfo"></param>
/// <param name="addr"></param>
/// <returns></returns>
public async Task <IPEndPoint> CheckCircuitByEndPoint(ServiceConfigureInfo configure, IPEndPoint clientEndPoint)
{
//根据配置抛弃断路状态地址
var useAddr = configure.GetEndPoints().Where(x => x.BreakerTime == null || (x.BreakerTime != null && x.BreakerTime.Value.AddSeconds(configure.DefBreakerRetryTimeSec) <= DateTime.Now)).ToList();
//若全部熔断
if (!useAddr.Any())
{
_logger.LogError("服务被熔断,无法提供服务");
return(null);
}
else
{
//负载均衡有效地址
var addr = _endPointConfigure.GetServieByLoadBalane(useAddr, clientEndPoint, LoadBalanceType.IPHash, configure);
//初始化令牌桶并判断是否限流
_tokenBucket.InitTokenBucket(configure.DefCapacity, configure.DefRateLimit);
if (await _tokenBucket.Grant(configure))
{
return(addr);
}
return(null);
}
}
