.Net powershell EventingBasicConsumer

[Patrick von der Hagen]

Hi,

I've been running some powershell-Consumer for years, using some old RabbitMQ.dll from 2014. Not sure about the version, probably the last one not affected by https://github.com/rabbitmq/rabbitmq-dotnet-client/issues/264

It stopped working with more recent rabbitmq-releases, so it blocked me from upgrading rabbitmq as well.

Now I have to upgrade rabbitmq from 3.5 to 3.7 for other reasons and therefore need a fix for my powershell-script. I chose RabbitMQ.Client 5.1.0, no reason not to go to the latest release.

The old code is using RabbitMQ.Client.QueueingBasicConsumer, which I need to change to RabbitMQ.Client.Events.EventingBasicConsumer.

This is what I try:

$consumer = New-Object RabbitMQ.Client.Events.EventingBasicConsumer($channel)

$a = function x( $c, $ea) {

$body = $ea.Body

$props = $ea.BasicProperties

$messageJson = $enc.GetString($body)

Write-Warning $messageJson

$channel.BasicNack($ea.DeliveryTag, $false, $true)

}

Register-ObjectEvent $consumer -EventName "Received" $a

$autoAck = $false

$consumerTag = $channel.BasicConsume($queue, $autoAck, $consumer, [type]::Missing,[type]::Missing,[type]::Missing,[type]::Missing)

I'd be extremely surprised if the event worked, but the call to $channel.BasicConsume fails, so that's to be solved later...

The current error is: Cannot find an overload for "BasicConsume" and the argument count: "7".

But as far as I can tell, 7 should be correct?

if I try $channel.BasicConsume($queue, $autoAck, $consumer, $null,$null,$null,$null)

instead, the powershell simply crashes. I'm not surprised, "Missing" seams much more reasonable.

Obviously, I started with $channel.BasicConsume($queue, $autoAck, $consumer), but it's wrong argument count again.

Passing named parameters to .net-code is not supported by powershell.

So, any ideas? Somebody got a solution?

Pull would work, but I'd like to avoid it.

Best regards
Patrick

[Karl Nilsson]

There is only one "real" method on the IModel interface in 5.x and that is the one with 7 arguments [1]. All the other overloads are implemented as extension methods. Not sure if powershell is able to resolve those but you should be able to use the 7 argument method.

[1] https://github.com/rabbitmq/rabbitmq-dotnet-client/blob/v5.1.0/projects/client/RabbitMQ.Client/src/client/api/IModel.cs#L198

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Karl Nilsson

Pivotal/RabbitMQ

[Patrick von der Hagen]

Well, as my code shows I've been trying to use that method, but it's quite hard to do without any idea what "noLocal" or "arguments" might be about.

Should I draw inspiration from RabbitMQ.Client/src/client/api/IModelExtensions.cs and just hope for the best?

It uses 

           

bool autoAck = false,
string consumerTag = "",
bool noLocal = false,
bool exclusive = false,
IDictionary<string, object> arguments = null

Best regards
Patrick

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Karl Nilsson

Pivotal/RabbitMQ

[Karl Nilsson]

That would be a good start. just passing nulls to everything apart from the args is likely to fail.

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Karl Nilsson

Pivotal/RabbitMQ