Comment 31 for bug 1470700

I just tried this again with the latest PPA. The behavior is still weird. Initially, I'm in flight mode and the status is correct, and the GET request fails immediately, as expected. Then I turn flight mode off and wait until the wifi connection is up, then request a few more thumbnails. At that point, the accessibility status is still "network down" for several GET requests in a row.

I'm also seeing a bunch of these in the log:

thumbnailer-service: [00:18:43.520] QNAM: -1
thumbnailer-service: [00:18:43.520] sending request
thumbnailer-service: [00:18:43.521] Warning: QObject::connect: Cannot connect (null)::stateChanged(QNetworkSession::State) to QNetworkReplyHttpImpl::_q_networkSessionStateChanged(QNetworkSession::State)

(The "QNAM" is the trace for the accessibility status.)

After a bunch more of these, in the end, I see this:

thumbnailer-service: [00:18:43.520] QNAM: -1
thumbnailer-service: [00:18:43.520] sending request
thumbnailer-service: [00:18:43.521] Warning: QObject::connect: Cannot connect (null)::stateChanged(QNetworkSession::State) to QNetworkReplyHttpImpl::_q_networkSessionStateChanged(QNetworkSession::State)
thumbnailer-service: [00:18:46.822] QNAM: -1
thumbnailer-service: [00:18:46.829] sending request
thumbnailer-service: [00:18:46.831] Warning: QObject::connect: Cannot connect (null)::stateChanged(QNetworkSession::State) to QNetworkReplyHttpImpl::_q_networkSessionStateChanged(QNetworkSession::State)
thumbnailer-service: [00:18:46.910] "artist: Pink Floyd/ (512,512): 3.454583 [d: 3.365325] sec (MISS)"
thumbnailer-service: [00:18:46.914] QNAM: -1
thumbnailer-service: [00:18:46.915] sending request
thumbnailer-service: [00:18:46.916] Warning: QObject::connect: Cannot connect (null)::stateChanged(QNetworkSession::State) to QNetworkReplyHttpImpl::_q_networkSessionStateChanged(QNetworkSession::State)
thumbnailer-service: [00:18:46.942] "artist: Pink Floyd/The Dark Side Of The Moon [2011 - Remaster] (512,512): 3.423468 [d: 3.393726] sec (MISS)"
thumbnailer-service: [00:18:48.096] QNAM: -1
thumbnailer-service: [00:18:48.100] sending request
thumbnailer-service: [00:18:48.109] Warning: QObject::connect: Cannot connect (null)::stateChanged(QNetworkSession::State) to QNetworkReplyHttpImpl::_q_networkSessionStateChanged(QNetworkSession::State)
thumbnailer-service: [00:18:48.190] "artist: Passport/Passport to Paradise (512,512): 4.671097 [q: 3.298519, d: 1.273558] sec (MISS)"
thumbnailer-service: [00:18:48.368] QNAM: -1
thumbnailer-service: [00:18:48.369] sending request
thumbnailer-service: [00:18:48.371] Warning: QObject::connect: Cannot connect (null)::stateChanged(QNetworkSession::State) to QNetworkReplyHttpImpl::_q_networkSessionStateChanged(QNetworkSession::State)
thumbnailer-service: [00:18:48.409] "artist: Mamady Keïta/ (512,512): 4.876946 [q: 3.379785, d: 1.454331] sec (MISS)"

Note that the accessibility status each time is still -1 even though, eventually, a the requests succeed. So, something is definitely not right here still.

Now I kill off the music app and wait for the thumbnailer-service to exit, all while the wifi connection is up. I then try again and see this:

thumbnailer-service: [00:27:35.858] QNAM: 1
thumbnailer-service: [00:27:35.864] sending request
thumbnailer-service: [00:27:35.873] QNAM: 1
thumbnailer-service: [00:27:35.879] sending request
thumbnailer-service: [00:27:35.927] "artist: Pink Floyd/The Dark Side Of The Moon [2011 - Remaster] (512,512): 10.127397 [d: 10.049212] sec (NETWORK DOWN)"
thumbnailer-service: [00:27:35.934] "artist: Passport/Passport to Paradise (512,512): 10.066997 [d: 10.004309] sec (NETWORK DOWN)"
thumbnailer-service: [00:27:37.638] QNAM: 1
thumbnailer-service: [00:27:37.641] sending request
thumbnailer-service: [00:27:37.719] "artist: Mamady Keïta/Afö (512,512): 11.852127 [q: 9.987196, d: 1.779486] sec (MISS)"
thumbnailer-service: [00:27:39.491] QNAM: 1
thumbnailer-service: [00:27:39.496] sending request
thumbnailer-service: [00:27:39.645] "album: Passport/Passport to Paradise (512,512): 13.765835 [q: 9.992015, d: 3.618609] sec (MISS)"
thumbnailer-service: [00:27:39.892] "album: Mamady Keïta/Afö (512,512): 13.944809 [q: 11.688131, d: 2.144388] sec (MISS)"
thumbnailer-service: [00:27:40.845] "album: Pink Floyd/The Dark Side Of The Moon [2011 - Remaster] (512,512): 14.866033 [q: 13.510416, d: 1.215110] sec (MISS)"

Now the accessibility status is 1, as it should be. But we get two more failing requests (the first two entries in the trace). The NETWORK DOWN status means that we waited for 10 seconds before giving up. But then we end up with three successful requests in the end. These were previously queued and held in the queue (by us) because we limit ourselves to two concurrent downloads.

So, this doesn't look right to me. It's as if there is some retry logic going on behind the scenes, and the accessibility status appears to still be wrong at least some of the time.