Sessions are not recreated after a media-hub crash

[Tiago Salem Herrmann]

After a media-hub crash (or even a manual kill $(pidof media-hub-server) ), existing sessions are not being invalidated/recreated.
That causes telephony-service-indicator to stop playing notifications for new messages, as it always reuse the same instance.

In dbus we see it is still trying to use an invalid session:
-----
method call sender=:1.132 -> dest=core.ubuntu.media.Service serial=77706 path=/core/ubuntu/media/Service/sessions/3; interface=org.mpris.MediaPlayer2.Player; member=OpenUri
   string "file:///usr/share/sounds/ubuntu/notifications/Xylo.ogg"
error sender=:1.485 -> dest=:1.132 error_name=org.freedesktop.DBus.Error.UnknownMethod reply_serial=77706
   string "Method "OpenUri" with signature "s" on interface "org.mpris.MediaPlayer2.Player" doesn't exist
"
---

And the logs are being flooded with the following message:

-----
Failed to get current playback position: org.freedesktop.DBus.Error.UnknownMeth
od: Method "Get" with signature "ss" on interface "org.freedesktop.DBus.Properti
es" doesn't exist
------

AalMediaPlayerService creates both the media session and the media hub control instance in its constructor, but it does not seem to manage media-hub appearing/disappearing on dbus.

[Pat McGowan (pat-mcgowan)]

bump priority and mark for this release, this causes missing ringtones on incoming calls

[Bill Filler (bfiller)]

for ota8, we will fix telephony-service to create a new instance of QMediaPlayer every time a new phone call is received as a workaround. But this underlying bug will still cause problems for other apps that use media-service, like music-app

to test:
1) open music-app
2) play a song and stop it
3) kill media-hub-server (it will get auto restarted)
4) try to play another song and it will fail, until you restart the app, which obviously you shouldn't have to

[Bill Filler (bfiller)]

the ringtone workaround will be fixed and tracked with this bug:
https://bugs.launchpad.net/canonical-devices-system-image/+bug/1512132

[Pat McGowan (pat-mcgowan)]

Bumping priority as people still reporting missed alarms

[Jim Hodapp (jhodapp)]

An implementation for this was started but set aside for some other high priority tasks. Will see about getting this back on to the front burner again soon.

[Łukasz Zemczak (sil2100)]

This bug was fixed in the package qtubuntu-media 0.8.1+15.04.20160720-0ubuntu1 in https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/stable-phone-overlay

---------------

qtubuntu-media (0.8.1+15.04.20160720-0ubuntu1) vivid; urgency=medium

  * Register for media-hub service unregister/register signals and raise
    an error to the client application when media-hub-server unregisters
    and then re-registers on dbus. This will allow the client to handle
    this event as it deems appropriate. (LP: #1506953)

 -- Jim Hodapp <email address hidden> Wed, 20 Jul 2016 21:28:27 +0000

[Launchpad Janitor (janitor)]

This bug was fixed in the package qtubuntu-media - 0.8.1+16.10.20160720-0ubuntu1

---------------
qtubuntu-media (0.8.1+16.10.20160720-0ubuntu1) yakkety; urgency=medium

  * Register for media-hub service unregister/register signals and raise
    an error to the client application when media-hub-server unregisters
    and then re-registers on dbus. This will allow the client to handle
    this event as it deems appropriate. (LP: #1506953)

 -- Jim Hodapp <email address hidden> Wed, 20 Jul 2016 21:28:27 +0000