Iris ignores lookup(playlist) track data when browsing, pulls track data one-by-one, resulting in hanging spinner in the UI

[MrSurly]

Describe the bug
This comment WRT "slow browsing" using the Tidal backend sums up what I think is going on.

To Reproduce

1. Setup Iris frontend, and a Tidal backend in Mopidy.
2. In Iris do: Browse --> Tidal --> Moods --> (select mood)
3. Get loading spinner, never recovers

Expected behavior
That tracks load and display quickly. Internally, I think Iris should use the results of lookup(playlist) to show track lists.

Environment details:

• OS: Raspberry Pi
• Browser: Firefox
• Iris version: Current PYPI version.

Additional context

At present, the mopidy-tidal backend doesn't return track data when doing lookup(playlist) (moods are just a type of playlist). Even after implementing that, it is ignored by Iris, which will use the track ref list obtained by browse(playlist), and then do a lookup(track) for each track. The Tidal API seems rate limited, so this takes a long time, and Iris (I presume) times out internally. If I artificially limit browse(playlist) to return 5 tracks, it works. But some of these mood playlists are 100+ tracks.

[MrSurly]

After looking at some other backends, I'm closing this, as it seems adding cache to the Tidal backend will fix this.

[kingosticks]

@jaedb I am still a little curious about what Iris is doing when browsing, Why does Iris do library.lookup(playlist_ref.uri) and then also library.browse(playlist_ref.uri)? Is this expected? Aren't the lookup results enough? You can see this behaviour in the example below:

HttpServer DEBUG    2021-02-10 00:12:54,309 Sent WebSocket message to 127.0.0.1: '{"jsonrpc": "2.0", "id": 19, "result": {"spotify:playlists:featured": []}}'

HttpServer DEBUG    2021-02-10 00:13:48,840 Received WebSocket message from 127.0.0.1: '{"method":"core.library.lookup","params":{"uris":["spotify:playlists:featured"]},"jsonrpc":"2.0","id":20}'

SpotifyBackend-4 INFO     2021-02-10 00:13:48,841 Failed to lookup 'spotify:playlists:featured': Could not parse 'spotify:playlists:featured' as a Spotify URI

HttpServer DEBUG    2021-02-10 00:13:48,842 Sent WebSocket message to 127.0.0.1: '{"jsonrpc": "2.0", "id": 20, "result": {"spotify:playlists:featured": []}}'

HttpServer DEBUG    2021-02-10 00:13:48,843 Received WebSocket message from 127.0.0.1: '{"method":"core.library.browse","params":{"uri":"spotify:playlists:featured"},"jsonrpc":"2.0","id":21}'

HttpServer DEBUG    2021-02-10 00:13:48,929 Sent WebSocket message to 127.0.0.1: '{"jsonrpc": "2.0", "id": 21, "result": [{"__model__": "Ref", "uri": "spotify:playlist:37i9dQZF1DWVEvzGeX3eRs", "name": "\'90s Baby Makers", "type": "playlist"}, {"__model__": "Ref", "uri": "spotify:playlist:37i9dQZF1DWYcDQ1hSjOpY", "name": "Deep Sleep", "type": "playlist"}, {"__model__": "Ref", "uri": "spotify:playlist:37i9dQZF1DXdQvOLqzNHSW", "name": "Late Night Vibes", "type": "playlist"}, {"__model__": "Ref", "uri": "spotify:playlist:37i9dQZF1DX2pSTOxoPbx9", "name": "Dark & Stormy", "type": "playlist"}, {"__model__": "Ref", "uri": "spotify:playlist:37i9dQZF1DWUZ5bk6qqDSy", "name": "White Noise", "type": "playlist"}, {"__model__": "Ref", "uri": "spotify:playlist:37i9dQZF1DX6xOPeSOGone", "name": "Soft Rock", "type": "playlist"}, {"__model__": "Ref", "uri": "spotify:playlist:37i9dQZF1DX5bjCEbRU4SJ", "name": "Calm Down", "type": "playlist"}, {"__model__": "Ref", "uri": "spotify:playlist:37i9dQZF1DWZd79rJ6a7lp", "name": "Sleep", "type": "playlist"}, {"__model__": "Ref", "uri": "spotify:playlist:37i9dQZF1DX4sWSpwq3LiO", "name": "Peaceful Piano", "type": "playlist"}, {"__model__": "Ref", "uri": "spotify:playlist:37i9dQZF1DXbcPC6Vvqudd", "name": "Night Rain", "type": "playlist"}, {"__model__": "Ref", "uri": "spotify:playlist:37i9dQZF1DX4WYpdgoIcn6", "name": "Chill Hits", "type": "playlist"}, {"__model__": "Ref", "uri": "spotify:playlist:37i9dQZF1DWZqd5JICZI0u", "name": "Peaceful Meditation", "type": "playlist"}]}'

HttpServer DEBUG    2021-02-10 00:13:50,459 Sent WebSocket message to 127.0.0.1: '{"jsonrpc": "2.0", "id": 22, "result": {"spotify:playlist:37i9dQZF1DWVEvzGeX3eRs": [{"__model__": "Image", "uri": "https://i.scdn.co/image/ab67706f000000039d574d6f27a73e668fee93ef"}], "spotify:playlist:37i9dQZF1DWYcDQ1hSjOpY": [{"__model__": "Image", "uri": "https://i.scdn.co/image/ab67706f00000003c601a6a746366286845b8fda"}], "spotify:playlist:37i9dQZF1DXdQvOLqzNHSW": [{"__model__": "Image", "uri": "https://i.scdn.co/image/ab67706f000000037d625e1cc8524ffdca59dbe8"}], "spotify:playlist:37i9dQZF1DX2pSTOxoPbx9": [{"__model__": "Image", "uri": "https://i.scdn.co/image/ab67706f00000003a6e2870c97bde5e2719c20b8"}], "spotify:playlist:37i9dQZF1DWUZ5bk6qqDSy": [{"__model__": "Image", "uri": "https://i.scdn.co/image/ab67706f000000035654f5615b2aec45465d0fd2"}], "spotify:playlist:37i9dQZF1DX6xOPeSOGone": [{"__model__": "Image", "uri": "https://i.scdn.co/image/ab67706f000000038f7cea2939220d6a326924fa"}], "spotify:playlist:37i9dQZF1DX5bjCEbRU4SJ": [{"__model__": "Image", "uri": "https://i.scdn.co/image/ab67706f00000003278197087524cc094f86e82b"}], "spotify:playlist:37i9dQZF1DWZd79rJ6a7lp": [{"__model__": "Image", "uri": "https://i.scdn.co/image/ab67706f00000003b70e0223f544b1faa2e95ed0"}], "spotify:playlist:37i9dQZF1DX4sWSpwq3LiO": [{"__model__": "Image", "uri": "https://i.scdn.co/image/ab67706f00000003ca5a7517156021292e5663a6"}], "spotify:playlist:37i9dQZF1DXbcPC6Vvqudd": [{"__model__": "Image", "uri": "https://i.scdn.co/image/ab67706f0000000393fe06c436d719d3f31107d0"}], "spotify:playlist:37i9dQZF1DX4WYpdgoIcn6": [{"__model__": "Image", "uri": "https://i.scdn.co/image/ab67706f00000003cf8e264c6a92e245402ecb7a"}], "spotify:playlist:37i9dQZF1DWZqd5JICZI0u": [{"__model__": "Image", "uri": "https://i.scdn.co/image/ab67706f0000000312cf5fd4624cce89f748ec99"}]}}'

HttpServer DEBUG    2021-02-10 00:14:16,381 Received WebSocket message from 127.0.0.1: '{"method":"core.library.lookup","params":{"uris":["spotify:playlist:37i9dQZF1DWVEvzGeX3eRs"]},"jsonrpc":"2.0","id":23}'

SpotifyBackend-4 DEBUG    2021-02-10  Fetching Spotify playlist "'spotify:playlist:37i9dQZF1DWVEvzGeX3eRs'"

HttpServer DEBUG    2021-02-10 00:14:16,530 Sent WebSocket message to 127.0.0.1: '{"jsonrpc": "2.0", "id": 23, "result": {"spotify:playlist:37i9dQZF1DWVEvzGeX3eRs": [{"__model__": "Track", "uri": "spotify:track:0MrD47wtvAu6igsy8vqUzN", "name": "Uhh Ahh", "artists": [{"__model__": "Artist", "uri": "spotify:artist:6O74knDqdv3XaWtkII7Xjp", "name": "Boyz II Men"}], "album": {"__model__": "Album", "uri": "spotify:album:7JnLsJWNUf50DGZ5JhBgbO", "name": "Cooleyhighharmony - Expanded Edition", "artists": [{"__model__": "Artist", "uri": "spotify:artist:6O74knDqdv3XaWtkII7Xjp", "name": "Boyz II Men"}], "date": "2009"}, "track_no": 4, "disc_no": 1, "length": 228866, "bitrate": 320}, {"__model__": "Track", "uri": "spotify:track:1mC7u32zemMLC1mVOU02Pm", "name": "U Send Me Swingin\'", "artists": [{"__model__": "Artist", "uri": "spotify:artist:4MT97VeycuegSicrrphisJ", "name": "Mint Condition"}], "album": {"__model__": "Album", "uri": "spotify:album:7j4tPYe42ilCuMB3EzPwC3", "name": "Jacked: Music Inspired by the Podcast (Episode 4: Control)", "artists": [{"__model__": "Artist", "uri": "spotify:artist:0LyfQWJT6nXafLPZqxe9Of", "name": "Various Artists"}], "date": "2020"}, "track_no": 5, "disc_no": 1, "length": 314537, "bitrate": 320}, {"__model__": "Track", "uri": "spotify:track:0TEPE1KMWY0satuZIBtuRt", "name": "All I See", "artists": [{"__model__": "Artist", "uri": "spotify:artist:27TmRLInIAVyWyU14KlALf", "name": "Christopher Williams"}], "album": {"__model__": "Album", "uri": "spotify:album:0POYPvGgqNdWX1G3BQBncS", "name": "Changes", "artists": [{"__model__": "Artist", "uri": "spotify:artist:27TmRLInIAVyWyU14KlALf", "name": "Christopher Williams"}], "date": "1992"}, "track_no": 1, "disc_no": 1, "length": 260666, "bitrate": 320}, {"__model__": "Track", "uri": "spotify:track:7EgBkZlqWRwvjmyc115LLR", "name": "Don\'t Be Afraid", "artists": [{"__model__": "Artist", "uri": "spotify:artist:772SIFJQiXTCfxncTK1UMn", "name": "Aaron Hall"}], "album": {"__model__": "Album", "uri": "spotify:album:5ASOftLg56vF8xCBqRYjTN", "name": "The Truth", "artists": [{"__model__": "Artist", "uri": "spotify:artist:772SIFJQiXTCfxncTK1UMn", "name": "Aaron Hall"}], "date": "1993"}, "track_no": 10, "disc_no": 1, "length": 271506, "bitrate": 320}, {"__model__": "Track", "uri": "spotify:track:6ygcYdLszK2DJUU7BWuCxx", "name": "It Never Rains (In Southern California)", "artists": [{"__model__": "Artist", "uri": "spotify:artist:7vWlb4pM85jCHvV771qZZW", "name": "Tony! Toni! Ton\\u00e9!"}], "album": {"__model__": "Album", "uri": "spotify:album:5yORmYtkTZdFgo6ppcsFZT", "name": "The Revival", "artists": [{"__model__": "Artist", "uri": "spotify:artist:7vWlb4pM85jCHvV771qZZW", "name": "Tony! Toni! Ton\\u00e9!"}], "date": "1990"}, "track_no": 6, "disc_no": 1, "length": 304240, "bitrate": 320}, {"__model__": "Track", "uri": "spotify:track:74glbwcJjpaHIk4uqHilnM", "name": "Pleasure & Pain", "artists": [{"__model__": "Artist", "uri": "spotify:artist:7urq0VfqxEYEEiZUkebXT4", "name": "112"}], "album": {"__model__": "Album", "uri": "spotify:album:5lSLGYViKHz22S8gEXz9Vc", "name": "112", "artists": [{"__model__": "Artist", "uri": "spotify:artist:7urq0VfqxEYEEiZUkebXT4", "name": "112"}], "date": "1996"}, "track_no": 3, "disc_no": 1, "length": 256959, "bitrate": 320}, {"__model__": "Track", "uri": "spotify:track:44QrzYVAHFC9WMN91GEo9H", "name": "Take Our Time", "artists": [{"__model__": "Artist", "uri": "spotify:artist:0TImkz4nPqjegtVSMZnMRq", "name": "TLC"}], "album": {"__model__": "Album", "uri": "spotify:album:5eg56dCpFn32neJak2vk0f", "name": "Crazysexycool", "artists": [{"__model__": "Artist", "uri": "spotify:artist:0TImkz4nPqjegtVSMZnMRq", "name": "TLC"}], "date": "1994"}, "track_no": 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[{"__model__": "Artist", "uri": "spotify:artist:2Mu5NfyYm8n5iTomuKAEHl", "name": "Ms. Lauryn Hill"}], "date": "1998"}, "track_no": 12, "disc_no": 0, "date": "1998", "length": 351000, "bitrate": 320}], "spotify:track:6xYd4zCVeSp80Un2Rl9wDs": [{"__model__": "Track", "uri": "spotify:track:6xYd4zCVeSp80Un2Rl9wDs", "name": "Cruisin\' - Carl Mackintosh Mix", "artists": [{"__model__": "Artist", "uri": "spotify:artist:336vr2M3Va0FjyvB55lJEd", "name": "D\'Angelo"}], "album": {"__model__": "Album", "uri": "spotify:album:1Owp8VOaFEk4r7zkvGOHmE", "name": "Brown Sugar", "artists": [{"__model__": "Artist", "uri": "spotify:artist:336vr2M3Va0FjyvB55lJEd", "name": "D\'Angelo"}], "date": "1995"}, "track_no": 7, "disc_no": 0, "date": "1995", "length": 385000, "bitrate": 320}], "spotify:track:4lRrk574qIHpoEEKC1zuam": [{"__model__": "Track", "uri": "spotify:track:4lRrk574qIHpoEEKC1zuam", "name": "At Your Best (You Are Love)", "artists": [{"__model__": "Artist", "uri": "spotify:artist:0urTpYCsixqZwgNTkPJOJ4", "name": "Aaliyah"}], "album": {"__model__": "Album", "uri": "spotify:album:3E3QRjL4Cre7Krms420Irl", "name": "Age Ain\'t Nothing But A Number", "artists": [{"__model__": "Artist", "uri": "spotify:artist:0urTpYCsixqZwgNTkPJOJ4", "name": "Aaliyah"}], "date": "1994"}, "track_no": 6, "disc_no": 0, "date": "1994", "length": 291000, "bitrate": 320}]}}'

• The attempt to lookup spotify:playlists:featured returns an empty result because Mopidy-Spotify doesn't support library.lookup() of Ref.Directory types. In which case, calling library.browse() instead makes perfect sense.
• Later it takes one of the results, the Ref.Playlist spotify:playlist:37i9dQZF1DWVEvzGeX3eRs, and does a lookup of that. This returns a list of Tracks that it could presumably use. Why in that case does it still also do a library.browse()?

[jaedb]

@kingosticks the sole purpose (rightly or wrongly) of library.lookup is to fetch the name of the URI which we're displaying. I can see that, in the case of Mopidy-Spotify, there is enough data in the library.browse response to achieve everything Iris needs.

However many backends are not as complete as Mopidy-Spotify (I'm looking at you, Mopidy-Dleyna) and library.lookup returns an empty array, whereas library.browse returns Ref objects.

So for Iris to deliver a consistent experience across these backends, these double-up requests are necessary. A workaround could be to call library.browse first, and if there isn't sufficient data then call library.lookup as well, but this would need some scoping.

[kingosticks]

I'm not sure I entirely follow that sequence (I thought the ideal sequence would always be lookup first, and if that's empty then fallback to browse) but I appreciate the backends provide inconsistent levels of support so it's not as simple as we'd like. I just wanted to double check it was as you expected. Cheers for the explanation.

[MrSurly]

FYI, adding caching to the mopidy-tidal backend eliminated the performance issues that spawned all of this.

[jaedb]

I'm looking at how we can improve this. The benefit of the double-up is that objects that are a Track Ref object is fetched, giving the full track object (for a more complete experience). But the cost is performance.

I would like to implement some kind of 'fetch full object on render' so we only need to get full objects when a track/album/playlist/etc is in view. But that is a separate piece of work.