v4.0.0 - CreateConnection() within WebAPI Controller

[conradcreel]

The following code hangs at CreateConnection() when placed inside of a WebAPI endpoint using v4.0.0 of RabbitMQ.Client. Confirmed it works with v3.6.5. Further confirmed that the exact same code works when called in Application_Start but not in Application_BeginRequest using v4.0.0.

Using latest ASP.NET WebAPI/OWIN and .NET 4.6.1.

       var factory = new ConnectionFactory
        {
            HostName = "localhost",
            UserName = "XXX",
            Password = "YYY"
        };

        string queueName = "ZZZ";

        var args = new Dictionary<string, object>();
        args.Add("x-dead-letter-exchange", "TTT");
        args.Add("x-dead-letter-routing-key", queueName);
        string message = "Current time: " + DateTime.Now.ToLongTimeString();

        using (var connection = factory.CreateConnection())
        using (var channel = connection.CreateModel())
        {
            channel.QueueDeclare(queueName, true, false, false, args);

            var body = Encoding.UTF8.GetBytes(message);

            channel.BasicPublish(exchange: "",
                routingKey: queueName,
                basicProperties: null,
                body: body);
        }

[michaelklishin]

Please post a traffic capture with both versions.

[kjnilsson]

I suspect we may have fallen foul of the async/await deadlock problem when using task schedulers other than the default one. I will perform some additional testing using winforms and/or web api to see if I can replicate it.

[kjnilsson]

@infinutrition there is now a release candidate for 4.0.1 available on nuget.org for you to try: https://www.nuget.org/packages/RabbitMQ.Client/4.0.1-rc1

[conradcreel]

@kjnilsson Initial tests show that the 4.0.1 RC1 works, thank you both for the quick action.

[michaelklishin]

@infinutrition thank you for reporting it and helping us verify.