bbf52eede9
While trying to remove traces of stop calls in core to get gapless working I found we had no way to switch to switch tracks without triggering a play. This change fixes this by changing the backends playback provider API. - play() now _only_ starts playback and does not take any arguments. - prepare_change() has been added, this could have been avoided with a kwarg to change_track(track), but that would break more backends. - core has been updated to call prepare_change+change_track+play as needed. - tests have been updated to handle this change. Longer term I hope to completely rework the playback API in backends, as 99% of our backends only use change_track(track) to translate URIs. So we should make simple case simple, and handle mopidy-spotify / appsrc in some other way. Cherry picked from the WIP gapless branch.
139 lines
3.6 KiB
Python
139 lines
3.6 KiB
Python
"""A dummy backend for use in tests.
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This backend implements the backend API in the simplest way possible. It is
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used in tests of the frontends.
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"""
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from __future__ import absolute_import, unicode_literals
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import copy
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import pykka
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from mopidy import backend
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from mopidy.models import Playlist, Ref, SearchResult
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def create_proxy(config=None, audio=None):
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return DummyBackend.start(config=config, audio=audio).proxy()
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class DummyBackend(pykka.ThreadingActor, backend.Backend):
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def __init__(self, config, audio):
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super(DummyBackend, self).__init__()
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self.library = DummyLibraryProvider(backend=self)
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self.playback = DummyPlaybackProvider(audio=audio, backend=self)
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self.playlists = DummyPlaylistsProvider(backend=self)
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self.uri_schemes = ['dummy']
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class DummyLibraryProvider(backend.LibraryProvider):
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root_directory = Ref.directory(uri='dummy:/', name='dummy')
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def __init__(self, *args, **kwargs):
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super(DummyLibraryProvider, self).__init__(*args, **kwargs)
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self.dummy_library = []
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self.dummy_get_distinct_result = {}
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self.dummy_browse_result = {}
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self.dummy_find_exact_result = SearchResult()
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self.dummy_search_result = SearchResult()
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def browse(self, path):
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return self.dummy_browse_result.get(path, [])
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def get_distinct(self, field, query=None):
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return self.dummy_get_distinct_result.get(field, set())
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def find_exact(self, **query):
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return self.dummy_find_exact_result
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def lookup(self, uri):
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return [t for t in self.dummy_library if uri == t.uri]
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def refresh(self, uri=None):
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pass
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def search(self, **query):
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return self.dummy_search_result
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class DummyPlaybackProvider(backend.PlaybackProvider):
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def __init__(self, *args, **kwargs):
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super(DummyPlaybackProvider, self).__init__(*args, **kwargs)
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self._uri = None
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self._time_position = 0
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def pause(self):
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return True
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def play(self):
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return self._uri and self._uri != 'dummy:error'
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def change_track(self, track):
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"""Pass a track with URI 'dummy:error' to force failure"""
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self._uri = track.uri
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self._time_position = 0
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return True
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def prepare_change(self):
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pass
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def resume(self):
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return True
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def seek(self, time_position):
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self._time_position = time_position
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return True
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def stop(self):
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self._uri = None
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return True
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def get_time_position(self):
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return self._time_position
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class DummyPlaylistsProvider(backend.PlaylistsProvider):
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def __init__(self, backend):
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super(DummyPlaylistsProvider, self).__init__(backend)
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self._playlists = []
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@property
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def playlists(self):
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return copy.copy(self._playlists)
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@playlists.setter
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def playlists(self, playlists):
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self._playlists = playlists
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def create(self, name):
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playlist = Playlist(name=name, uri='dummy:%s' % name)
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self._playlists.append(playlist)
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return playlist
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def delete(self, uri):
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playlist = self.lookup(uri)
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if playlist:
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self._playlists.remove(playlist)
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def lookup(self, uri):
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for playlist in self._playlists:
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if playlist.uri == uri:
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return playlist
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def refresh(self):
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pass
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def save(self, playlist):
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old_playlist = self.lookup(playlist.uri)
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if old_playlist is not None:
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index = self._playlists.index(old_playlist)
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self._playlists[index] = playlist
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else:
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self._playlists.append(playlist)
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return playlist
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