Detect all topics for which publishers exist

[Muhammad Bhatti]

Hi,

Is there any way to get a list of publishers, or find out what topics some publishers are publishing to?

I know t's possible to find a list of subscribers, or sessions, and find out what topics they are subscribed to:

# Find all subscribers
session.call("wamp.subscription.list").then(session.log, session.log)
# topic URI can be found in the return args
session.call("wamp.subscription.get", [3540230488190230]).then(session.log, session.log)

I want to do something similar, using a crossbar.io router, but for Publishers instead of Subscribers. Mainly interested in all the topics which have 1 or more publishers (with 0 or more subscribers). Is such a thing possible, or are there any work-arounds?

Thanks,

Muhammad

[Tobias Oberstein]

Hi,

message publication does not require any kind of pre-announcment (there is no register of publisher), so there is no WAMP meta API for that.

that being said, crossbarfx (an extended version of crossbar) does have a feature called "message tracing", which allows you to tap into _all_ WAMP messaging running through a node

https://crossbario.com/docs/crossbarfx/dataplane/message_tracing.html

https://crossbario.com/docs/crossbarfx/management/remotecontrol/examples.html#message-tracing

crossbarfx also has message persistency for WAMP pubsub events, and the data can be queried (via a WAMP API) or analyzed directly from Jupyter

https://crossbario.com/docs/crossbarfx/dataplane/event_store.html

Cheers,

/Tobias

Am 18.01.19 um 17:04 schrieb Muhammad Bhatti:

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