[Bug 29417] New: Add API to get a TpAccount from a TpContact and/or TpConnection

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29417

           Summary: Add API to get a TpAccount from a TpContact and/or
                    TpConnection
           Product: Telepathy
           Version: git master
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: tp-glib
        AssignedTo: telepathy-bugs at lists.freedesktop.org
        ReportedBy: xclaesse at gmail.com
         QAContact: telepathy-bugs at lists.freedesktop.org


It is a common case to need to get the TpAccount object from a TpContact. The
work flow is usually:

You have an object 'self' which needs to work with contacts:
1) Get a TpAccount
2) Gets its TpConnection, and wait for it to be ready. You have only one
user_data so you give self
3) Get some TpContact from the connection
4) ... You need the TpAccount of that contact, but since the only user_data you
had for step 2 is self, you "lost" the account pointer.

The usual solutions for that is to use g_object_set_data(connection, "account",
account); or create a struct{self, account}; to pass as user_data. It is ugly
and complex for a very common flow IMO.

So I suggest adding a TpConnection:account construct-only property. When
TpAccount creates its own TpConnection object, that property is set. If the
TpConnection is created manually, that property is defined as NULL. Like that
we are sure to keep a 1:1 mapping TpAccount<>TpConnection.

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