Python and stomp

[Alex Dudiak]

Does anybody have any experience of using stomp with python. I can connect and get data through c#, but when I try the same test through python (using the stomp.py library 'http://code.google.com/p/stomppy/'). I get the error 'User ......... is not authorized to read from: queue://topic://TRAIN_MVT_ALL_TOC'.

Any pointers greatly appreciated 

Regards

Alex

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[Peter Hicks]

Hi Alex

On 29 Jan 2013, at 19:44, Alex Dudiak <alex....@automsoft.com> wrote:

> Does anybody have any experience of using stomp with python. I can connect and get data through c#, but when I try the same test through python (using the stomp.py library 'http://code.google.com/p/stomppy/'). I get the error 'User ......... is not authorized to read from: queue://topic://TRAIN_MVT_ALL_TOC'.

You need to specify /topic/TRAIN_MVT_ALL_TOC rather than queue://topic:// - that's possibly where it's failing.


Peter

[Alex Dudiak]

Much appreciated Peter, the extra slash was the culprit. Code now happily returning loads of lovely json, now the fun of making sense of it all.

Regards

Alex

[Rob Bainbridge]

Hi Alex, Peter, 

I stumbled across this thread when trying to access the Network Rail data feeds using python. I have tried manipulating the "topic" string, as suggested above, but I still see the following error:

stompy.frame.BrokerErrorResponse: Broker Returned Error: java.lang.SecurityException: User XXX is not authorized to read from: topic://TRAIN_MVT_ALL_TOC

Example code to reproduce the behaviour is found below. I know it's not a question of subscription because when I subscribe to a stream directly via the website, I can connect without any problems and pull the feed. So presumably it's a problem related to how I'm using the STOMP client. 

Any help is appreciated. 

Cheers,

rob

from stompy.simple import Client

feed = Client(host='datafeeds.networkrail.co.uk', port=61618)

feed.connect(username='my_email',password='my_passwd')

feed.subscribe('/topic/TRAIN_MVT_ALL_TOC')

print feed.get()

feed.unsubscribe('/topic/TRAIN_MVT_ALL_TOC')

feed.disconnect()

[Peter Hicks]

On 03/07/13 13:03, Rob Bainbridge wrote:
> I stumbled across this thread when trying to access the Network Rail
> data feeds using python. I have tried manipulating the "topic" string,
> as suggested above, but I still see the following error:
>
> stompy.frame.BrokerErrorResponse: Broker Returned Error:
> java.lang.SecurityException: User XXX is not authorized to read from:
> topic://TRAIN_MVT_ALL_TOC
>
> Example code to reproduce the behaviour is found below. I know it's
> not a question of subscription because when I subscribe to a stream
> directly via the website, I can connect without any problems and pull
> the feed. So presumably it's a problem related to how I'm using the
> STOMP client.
>

Have you tried just /topic/TRAIN_MVT_ALL_TOC?


Peter

[Rob Bainbridge]

Hi Peter,

thanks for your reply. This is indeed what I used:

feed.subscribe('/topic/TRAIN_MVT_ALL_TOC')

The error message reformats this to:

User XXX is not authorized to read from: topic://TRAIN_MVT_ALL_TOC

Various trials reveal similar messages. For instance, if I remove the leading "/" then I see this:

User XXX is not authorized to read from: queue://topic/TRAIN_MVT_ALL_TOC

If I subscribe to a feed via the website, the error message disappears and I receive the feed normally. 

[Jonathon Hurley]

> If I subscribe to a feed via the website, the error message disappears and I receive the feed normally.
>

Forgive me if I've missed the point, but isn't that the expected
behaviour? To be able to access a feed you need to subscribe to it
through the website first.

Regards

Jonathon

[Peter Hicks]

Correct - you need to subscribe to a feed before you can read from it -
it's so we can see who's using which feed, which the most popular ones
are, etc.


Peter

[Rob Bainbridge]

Ah, my mistake - apologies for the noise. 

(I understood the subscribe method in the STOMP API to perform this action.)

Thanks for the prompt feedback. 

Cheers,

rob