IBus.Publish not respecting CancellationToken

Is this a bug report?

Yes

Can you also reproduce the problem with the latest version?

Yes

Environment

1. Operating system: Windows 10 x64 Build 1809
2. Visual Studio version: 2019
3. Dotnet version: Core 3.0
4. MT version: 6.2.1

Steps to Reproduce

(Write your steps here:)

1. Setup a RabbitMQ bus instance
2. Create CancellationTokenSource instance that cancels after a period of time
3. Call IBus.Publish

Expected Behavior

I would expect either IPublishEndpoint to behave similar to ISendEndpoint where if RabbitMQ is down it throws an exception immediately or the call to Publish would hang and the task would cancel when the time span specified is reached.

Actual Behavior

The task never completes and only shows the task as being cancelled after RabbitMQ service is back up.

Reproducible Demo

static async Task Main(string[] args) {
	var cts = new CancellationTokenSource();
	var bus = Bus.Factory.CreateUsingRabbitMq(cfg => {
		cfg.Host("localhost");
		cfg.ReceiveEndpoint("value-entered", e => {
			e.Consumer<Program>();
		});
	});
	try {
		await bus.StartAsync();
		// Stop the RabbitMQ service before publish
		cts.CancelAfter(TimeSpan.FromSeconds(15));
		await bus.Publish(new ValueEntered(), cts.Token);

		// *NOTE* Using a send endpoint when RabbitMQ is down causes an exception to throw immediately
		//var sendEndpoint = await bus.GetSendEndpoint(new Uri("rabbitmq://localhost/value-entered"));
		//await sendEndpoint.Send(new ValueEntered(), cts.Token);
	}
	catch (TaskCanceledException e) {
		Console.WriteLine($"Publish cancelled.  Message: {e.Message}");
	}
	catch (Exception err) {
		Console.WriteLine($"Error: {err.Message}");
	}
	finally {
		await bus.StopAsync();
	}
}

[lkomanetz]

Thank you again @phatboyg for looking at this and fixing it so quickly.

[mstrukov]

Good news! When do you think a new nuget package will be published with the fix?