/// <summary>
///
/// </summary>
/// <typeparam name="TResponse"></typeparam>
/// <param name="call"></param>
/// <param name="retryLeft"></param>
/// <returns></returns>
private TResponse Call <TResponse>(Func <CallInvoker, TResponse> call, int retryLeft)
{
while (true)
{
var callInvoker = default(ServerCallInvoker);
try
{
if (_callInvokers != null)
{
var invokers = _strategy.GetCallInvokers(_options.ServiceName);
callInvoker = _callInvokers(invokers);
}
else
{
callInvoker = _strategy.GetCallInvoker(_options.ServiceName);
}
if (callInvoker == null)
{
throw new ArgumentNullException($"{_options.ServiceName}无可用节点");
}
if (callInvoker.Channel == null || callInvoker.Channel.State == ChannelState.TransientFailure)
{
throw new RpcException(new Status(StatusCode.Unavailable, $"Channel Failure"));
}
if (_options.Interceptors?.Count > 0)
{
return(call(callInvoker.Intercept(_options.Interceptors.ToArray())));
}
return(call(callInvoker));
}
catch (RpcException ex)
{
// 服务不可用，拉入黑名单
if (ex.Status.StatusCode == StatusCode.Unavailable)
{
_strategy.Revoke(_options.ServiceName, callInvoker);
}
if (0 > --retryLeft)
{
throw new Exception($"status: {ex.StatusCode}, node: {callInvoker?.Channel?.Target}, message: {ex.Message}", ex);
}
}
}
}
