MPRIS interface isn't always exposed after a connection reset

[eladyn]

          > 7\. Calling `rs.spotifyd.Controls.TransferPlayback` causes the MPRIS service to become available as well.

Unfortunately, I am able to reliably reproduce every step except for this one.

When the connection to the server is genuinely closed, I can successfully transfer playback using: busctl call --user rs.spotifyd.instance$(pidof -s spotifyd) /rs/spotifyd/Controls rs.spotifyd.Controls TransferPlayback every time. However, on some occasions, when I try to invoke Play or PlayPause, I receive the following error afterward: Call failed: The name org.mpris.MediaPlayer2.spotifyd.instance<PID> was not provided by any .service files. The same happens when I try: busctl introspect --user org.mpris.MediaPlayer2.spotifyd.instance<PID> /org/mpris/MediaPlayer2. This confirms that the D-Bus interface is not always exposed reliably. Notably, when I manually restart the systemd service, I haven’t observed this issue.

Originally posted by @soulseller in #1317 (comment)

[soulseller]

Below are additional error cases with identical outcomes that are worth reporting:

spotifyd[PID]: Connection reset by peer (os error 104)
spotifyd[PID]: subscription terminated
spotifyd[PID]: Using PulseAudioSink with format: F32
spotifyd[PID]: Connecting to AP "ap-<server>.spotify.com:443"
spotifyd[PID]: Authenticated as '<user>' !

spotifyd[PID]: Connection to server closed.
spotifyd[PID]: remote update selected, but none received
spotifyd[PID]: Using PulseAudioSink with format: F32
spotifyd[PID]: Connecting to AP "ap-<server>.spotify.com:443"
spotifyd[PID]: Authenticated as '<user>' !

spotifyd[PID]: Connection to server closed.
spotifyd[PID]: user attributes mutation selected, but none received
spotifyd[PID]: Using PulseAudioSink with format: F32
spotifyd[PID]: Connecting to AP "ap-<server>.spotify.com:443"
spotifyd[PID]: Authenticated as '<user>' !

spotifyd[PID]: Connection to server closed.
spotifyd[PID]: user attributes update selected, but none received
spotifyd[PID]: Using PulseAudioSink with format: F32
spotifyd[PID]: Connecting to AP "ap-<server>.spotify.com:443"
spotifyd[PID]: Authenticated as '<user>' !

spotifyd[PID]: Connection to server closed.
spotifyd[PID]: connection ID update selected, but none received
spotifyd[PID]: Using PulseAudioSink with format: F32
spotifyd[PID]: Connecting to AP "ap-<server>.spotify.com:443"
spotifyd[PID]: Authenticated as '<user>' !

spotifyd[PID]: ContextError: Error { kind: Unknown, error: StatusCode(502) }
spotifyd[PID]: Connection to server closed.
spotifyd[PID]: Cannot flush spirc event sender.
spotifyd[PID]: Cannot flush spirc event sender when done.
spotifyd[PID]: Loading <title> with Spotify URI <uri>
spotifyd[PID]: Broken pipe (os error 32)
spotifyd[PID]: Audio key response timeout
spotifyd[PID]: Unable to load key, continuing without decryption: Operation aborted { a>
spotifyd[PID]: Unable to read audio file: Symphonia Decoder Error: end of stream
spotifyd[PID]: Using PulseAudioSink with format: F32
spotifyd[PID]: Connecting to AP "ap-<server>.spotify.com:443"
spotifyd[PID]: Authenticated as '<user>' !

The outcome:

busctl call --user org.mpris.MediaPlayer2.spotifyd.instance$(pidof -s spotifyd) /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player <method>
Call failed: The name org.mpris.MediaPlayer2.spotifyd.instance<PID> was not provided by any .service files

busctl introspect --user org.mpris.MediaPlayer2.spotifyd.instance$(pidof -s spotifyd) /org/mpris/MediaPlayer2
Failed to introspect object /org/mpris/MediaPlayer2 of service org.mpris.MediaPlayer2.spotifyd.instance<PID>: The name org.mpris.MediaPlayer2.spotifyd.instance<PID> was not provided by any .service files

[eladyn]

Thanks for the additional details!

Just to confirm that again: Those logs all look like the playback has not yet been transferred to spotifyd again after the reconnection. So it makes sense that we do not expose org.mpris.MediaPlayer yet.

Can you check, if you can execute rs.spotifyd.Controls.TransferPlayback on rs.spotifyd.instance<PID> and do the MPRIS introspection afterwards?

[soulseller]

busctl introspect --user rs.spotifyd.instance$(pidof -s spotifyd) /rs/spotifyd/Controls
NAME                                TYPE      SIGNATURE RESULT/VALUE FLAGS
org.freedesktop.DBus.Introspectable interface -         -            -
.Introspect                         method    -         s            -
rs.spotifyd.Controls                interface -         -            -
.TransferPlayback                   method    -         -            -
.VolumeDown                         method    -         -            -
.VolumeUp                           method    -         -            -

busctl call --user rs.spotifyd.instance$(pidof -s spotifyd) /rs/spotifyd/Controls rs.spotifyd.Controls TransferPlayback

busctl call --user org.mpris.MediaPlayer2.spotifyd.instance$(pidof -s spotifyd) /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player <method>
Call failed: The name org.mpris.MediaPlayer2.spotifyd.instance<PID> was not provided by any .service files

busctl introspect --user org.mpris.MediaPlayer2.spotifyd.instance$(pidof -s spotifyd) /org/mpris/MediaPlayer2
Failed to introspect object /org/mpris/MediaPlayer2 of service org.mpris.MediaPlayer2.spotifyd.instance<PID>: The name org.mpris.MediaPlayer2.spotifyd.instance<PID> was not provided by any .service files

[eladyn]

Might be fixed by #1386.

[eladyn]

If someone still observes this behaviour, please ping me and I'll reopen. :)

[eladyn]

If someone still observes this behaviour, please ping me and I'll reopen. :)