private async Task <ActionExecutingContext> GetContext()
{
var onceCallParam = await _convert.GetServiceOnceCallParamAsync();
var(instanceMethodInfo, contractMethod, instance) = ApiWrapper.GetMethodInfo(onceCallParam.Action, _instances);
//get parameters
var parameters = contractMethod.MethodInfo.GetParameters();
//callback, cancel when exception
async Task Callback(object?i)
{
try
{
if (!_serviceCts.IsCancellationRequested)
{
await _convert.SendCallbackAsync(i);
}
else
{
_logger.LogWarning("Call back ignored, action is canceled.");
}
}
catch (Exception e)
{
_logger.LogWarning(e, "Callback error, cancel action.");
_serviceCts.Cancel();
throw;
}
}
//args
var args = ApiWrapper.GetArgs(parameters, onceCallParam.PureArgs, Callback, _serviceCts.Token, onceCallParam.Stream);
return(new ActionExecutingContext(
_serviceProvider,
onceCallParam.Header,
instance,
instanceMethodInfo,
contractMethod,
args,
onceCallParam.PureArgs,
onceCallParam.Action,
onceCallParam.Stream,
instance.Contract,
_channelType,
Callback,
_serviceCts.Token));
}
public async Task HandleRequestAsync()
{
ServiceCallParam scp = await GetServiceCallParamAsync();
object ret;
try
{
var apiContext = ApiWrapper.Convert(scp, _instances);
ret = await _middlewareRegister.InvokeAsync(new MiddlewareContext(apiContext));
}
catch (Exception e)
{
//send fault
await _convert.SendFaultAsync(e, scp.Action, scp.Args);
return;
}
var hasStream = ret.TryGetStream(out Stream retStream);
//send result
await _convert.SendResultAsync(new CustomResult(ret, retStream.GetLength()), scp.Action, scp.Args);
//send stream
if (hasStream)
{
try
{
await Helper.SendStreamAsync(i => _convert.SendBufferAsync(i), () =>
_convert.SendBufferEndAsync(), retStream, scp.Token);
}
catch (TaskCanceledException)
{
await _convert.SendBufferCancelAsync();
}
catch (Exception)
{
await _convert.SendBufferFaultAsync();
}
}
}