public async override Task Subscribe(PriceUpdateSubscription request, IServerStreamWriter <PriceUpdate> responseStream, ServerCallContext context)
{
var data = CreateUpdateMessage(1);
try
{
var cancel = context.CancellationToken;
while (!cancel.IsCancellationRequested)
{
await responseStream.WriteAsync(data);
}
}
catch (Exception ex)
{
Console.Error.WriteLine(ex);
}
}
public async override Task Subscribe(PriceUpdateSubscription request, IServerStreamWriter <PriceUpdate> responseStream, ServerCallContext context)
{
try
{
var cancel = context.CancellationToken;
var buffer = new BufferBlock <PriceUpdate>(
new DataflowBlockOptions {
BoundedCapacity = 1
});
var consumer = SendUpdates(buffer, responseStream, cancel);
var producer = ReceiveUpdates(request, buffer, cancel);
await Task.WhenAll(producer, consumer);
}
catch (Exception ex)
{
Console.Error.WriteLine(ex);
throw;
}
}
private async Task ReceiveUpdates(PriceUpdateSubscription request, ITargetBlock <PriceUpdate> output, CancellationToken cancel)
{
try
{
var httpRequest = m_client.Subscribe(request);
var subscription = httpRequest.ResponseStream;
while (await subscription.MoveNext(cancel))
{
var data = subscription.Current;
await output.SendAsync(data, cancel);
}
throw new RpcException(httpRequest.GetStatus());
}
catch (Exception ex)
{
Console.Error.WriteLine(ex);
throw;
}
}