[Bug 28974] New: Being able to observe connections

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28974

           Summary: Being able to observe connections
           Product: Telepathy
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: tp-spec
        AssignedTo: telepathy-bugs at lists.freedesktop.org
        ReportedBy: guillaume.desmottes at collabora.co.uk
         QAContact: telepathy-bugs at lists.freedesktop.org


Here is a crazy idea I had while waiting for the tube this morning. :)

So, with the explosions of crazy Connection interfaces (Location, Gabble
plugins implementing various PEP/pubsub related extensions such as bookmarks
sharing, etc) we are going to have more and more external applications
interested in observing all the connections without caring about channels.

That's the case for exemple of Azimuth. I wrote a simple ConnectionWatcher
object to do just that and I think Alban reused it when adding Location support
to map-buddy:
https://garage.maemo.org/plugins/ggit/browse.php/?p=azimuth;a=blob;f=src/connection-watcher.c;h=04f4b875a46cf71d9f5b6508785fec165232bde7;hb=HEAD

Of course we could implement such helper in tp-glib and tp-qt4 but maybe we
could do that directly in the spec.

What about allowing clients to observe connections? Azimuth could do something
like defining

Observer.ObserverConnectionFilter = [ { 'Connection.Status' : CONNECTED  } ]
Observer.recover = True

we could maybe even define that  { 'Connect.Interfaces' : [ Location ] } means
that the connection has to support the Location interface.

Then each time a new connection is connected MC would call on the client
something like
ObserveConnection(o: Account, o: Connection, a{sv}: Observer_Info)

This would make writing clients using connection interfaces much easier to
write.

So, crack or not?

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