/// <summary>
/// Get score for invoker
/// </summary>
/// <param name="ib"></param>
/// <returns></returns>
private int GetScore(InvokerBundle ib)
{
// not active
if (!ib.IsActive)
{
return(int.MinValue);
}
// not connected physically
if (ib.Channel.State != ChannelState.Idle && ib.Channel.State != ChannelState.Ready)
{
return(int.MinValue);
}
// score offset pow
int offset = 32768;
// default score
int score = 0;
// apl online (16 points)
if (ib.IsAplOnline)
{
score = score + offset * 16;
}
// error under limit (8 points)
if (ib.ErrorsBelowThreshold)
{
score = score + offset * 8;
}
// return score
return(score);
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="logger"></param>
/// <param name="clientConfiguration"></param>
/// <param name="connectionInfoList"></param>
/// <param name="channelCustomSelector"></param>
public ManagedCallInvoker(ILogger logger, GrpcClientConfiguration clientConfiguration,
List <GrpcChannelConnectionData> connectionInfoList, Func <object, string, string, string> channelCustomSelector = null)
{
// set properteis
_configuration = clientConfiguration;
_logger = logger;
_channelCustomSelector = channelCustomSelector;
// create invoke bundles
Invokers = connectionInfoList.Select(options => {
var ch = new Channel(options.Url, options.Port, ChannelCredentials.Insecure);
var inv = new DefaultCallInvoker(ch);
var bundle = new InvokerBundle(ch, inv, options);
return(bundle);
}).ToList();
// setup round robin
_roundRobin = new RoundRobinPolicy <InvokerBundle>(Invokers, GetScore);
}
/// <summary>
/// On execution completed
/// </summary>
/// <typeparam name="TRequest"></typeparam>
/// <typeparam name="TResponse"></typeparam>
/// <param name="watch"></param>
/// <param name="method"></param>
/// <param name="request"></param>
/// <param name="bundle"></param>
/// <param name="t"></param>
private void OnExecuteCompleteHandler <TRequest, TResponse>(Stopwatch watch, Method <TRequest, TResponse> method,
TRequest request, InvokerBundle bundle, Task <TResponse> t)
{
// task status
TaskStatus status = t.Status;
// get execution duration
watch.Stop();
var duration = watch.ElapsedMilliseconds;
// get svc name
var svcName = method.ServiceName.Split('.').Last();
// invoker status update
if (status == TaskStatus.RanToCompletion)
{
bundle.ResetError();
}
else
{
bundle.AddError();
}
// log end
if (_configuration.Options.LogRequests && _logger != null)
{
if (status == TaskStatus.RanToCompletion)
{
_logger.LogInformation("End for action {action} on client {client} with request {@request}, response {@response} and duration {duration}.",
$"{svcName}/{method.Name}", _configuration.Name, request, t.Result, duration);
}
else
{
_logger.LogError(t.Exception, "End for failed action {action} on client {client} with request {@request} and duration {duration}.",
$"{svcName}/{method.Name}", _configuration.Name, request, duration);
}
}
// request end action
try
{
_configuration.DataHandlers.OnRequestEnd?.Invoke(_logger, new RequestEndData
{
ServiceName = svcName,
MethodName = method.Name,
HostName = _configuration.Name,
Request = request,
Response = t.Result,
DurationMs = duration,
Exception = t.Exception
});
}
catch (Exception e)
{
_logger.LogError(e, "Failed to execute reqeust end action.");
}
}