[rabbitmq-discuss] SocketException when invoking model.BasicPublish

[Scott McFadden]

Hi Michael, had to decompile RabbitMQ.Client assembly and step through to
find the issue.  Apparently, my code doesn't always pass a non-null
messageId.  Setting a null messageId on the basicproperties is allowed but
the writing of a null messageId on the wire will cause an error inside
of RabbitMQ.Client.  So moral of the story is don't ever set a
basicproperties property unless it's non null (at least as of
RabbitMQ.Client 3.3.0).

I put connection and channel logic back in the same method and it works
great.   Here is new working version.

private void PublishMessage(byte[] message, Type messageType, string
contentType, string messageId)
        {
            if (message == null || message.Length == 0)
            {
                throw new ArgumentNullException("message");
            }
            if (messageType == null)
            {
                throw new ArgumentNullException("messageType");
            }
            if (String.IsNullOrEmpty(contentType))
            {
                throw new ArgumentNullException("contentType");
            }
 //            if (String.IsNullOrEmpty(messageId))
//            {
//                throw new ArgumentNullException("messageId");
//            }
            var factory = new ConnectionFactory() {VirtualHost =
this.VirtualHost, HostName = this.Host, UserName = this.User, Password =
this.Password };
            using (var connection = factory.CreateConnection())
            using (var channel = connection.CreateModel())
            {
                IBasicProperties props = channel.CreateBasicProperties();
                props.SetPersistent(this.PersistMessages);

                //Mime time
                props.ContentType = contentType;
                props.Type = messageType.FullName;
                if (!String.IsNullOrEmpty(messageId))
                {
                    //Must be careful not to set IBasicProperties with
possible null value as this will cause serialization errors downstream
(RabbitMQ.Client 3.3.0)
                    props.MessageId = messageId;
                }
                //Note, may get AlreadyClosedException here if publishing
to a incorrect exchange name
                channel.BasicPublish(this.ExchangeName, this.RoutingKey,
props, message);
            }
        }

thanks for the help.

scott


On Wed, Jun 18, 2014 at 10:05 PM, Michael Klishin <mklishin at gopivotal.com>
wrote:

>  On 19 June 2014 at 07:02:17, Scott McFadden (
> scott.kendall.mcfadden at gmail.com) wrote:
> > > It makes me think I screwed up the server side configuration
> > when reinstalling.
>
> There is no configuration that can affect framing/frame interleaving in
> the client.
> This is also the kind of issues that we'd see reported constantly if it
> was a client
> issue. Finally, it happens on a brand new connection.
>
> I'd recommend doing two things:
>
>  * Running a tracer proxy in front of RabbitMQ [1] to see what's being
> sent on the wire
>  * Open a connection on app start if you can instead of opening a new one
> per channel
>
> If the latter does not change anything, please post the output of the
> tracer.
>
> 1. http://www.rabbitmq.com/java-tools.html, see Tracer
> --
> MK
>
> Software Engineer, Pivotal/RabbitMQ
>
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