[Bug 35883] New: Add support for text message delivery report

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=35883

           Summary: Add support for text message delivery report
           Product: Telepathy
           Version: git master
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: logger
        AssignedTo: telepathy-bugs at lists.freedesktop.org
        ReportedBy: nicolas.dufresne at collabora.co.uk
         QAContact: telepathy-bugs at lists.freedesktop.org


The logger should support text message delivery report. Many feature can be
added through that support.

Proper support for delivery report would enable the Logger to detect message
echo that has been sent by other client store. Those echo are presented by a
delivery report of a message that was not sent by current client. In that case,
we would simply store a new message.

It would also enable the logger to provide a delivery status (if protocol
supports delivery report). This way, people could see in the log viewer which
message have been sent with success and ones that failed.

While I do think it would be easier to implement on top of a SQL storage, there
is a way to do it with the XML log store. Essentially, the delivery reports
would be stored in a separate XML file. When parsing a date (messages are split
into dates) the XML log store would first load the delivery reports and store
them into a hash table. The for each message we would look into the delivery
report hash table (using the message-token has key) and fill in proper delivery
status the text event. For sure, this require adding the message-token into the
TextEvent for log-store usage (will probably remain private). It is not as
efficient as if we could edit the message events, but the overhead is not too
excessive.

Note that delivery report support is currently missing in TpTextChannel class,
having this support would be very helpful.

We would also need a short term delivery report cache in the SQLite database
for the same reason we need one for pending messages, nicely handle logger or
other component crash.

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