[bugfix]: Do not require Subsonic disc/track number, fix lb-radio art…

…ist locally

This change has a few fixes:
- For subsonic import, allow track and disc number to be None (and default to 1). Subsonic servers are **not** guaranteed to return values here. Tested on my Navidrome instance
- Multiple fixes for get_similar_artists: proper post parameter, parse response, query using list of ids (not dicts), and return an empty array for msgs
- For `artist.py`, in some cases the `artist_credit` is `None`, also allow for this (via `AttributeError`)

troi/content_resolver/artist_search.py

@@ -39,18 +39,15 @@ def get_similar_artists(self, artist_mbid):
 
         r = requests.post("https://labs.api.listenbrainz.org/similar-artists/json",
                           json=[{
-                              'artist_mbid':
-                              artist_mbid,
+                              'artist_mbids':
+                              [artist_mbid],
                               'algorithm':
                               "session_based_days_7500_session_300_contribution_5_threshold_10_limit_100_filter_True_skip_30"
                           }])
         if r.status_code != 200:
             raise RuntimeError(f"Cannot fetch similar artists: {r.status_code} ({r.text})")
 
-        try:
-            artists = r.json()[3]["data"]
-        except IndexError:
-            return []
+        artists = r.json()
 
         # Knock down super hyped artists
         for artist in artists:
@@ -90,8 +87,9 @@ def search(self, mode, artist_mbid, pop_begin, pop_end, max_recordings_per_artis
                  ORDER BY artist_mbid
                         , popularity"""
 
+        artist_mbids = [artist["artist_mbid"] for artist in similar_artists]
         placeholders = ",".join(("?", ) * len(similar_artists))
-        cursor = db.execute_sql(query % placeholders, params=tuple(similar_artists))
+        cursor = db.execute_sql(query % placeholders, params=artist_mbids)
 
         artists = defaultdict(list)
         for rec in cursor.fetchall():
@@ -104,6 +102,6 @@ def search(self, mode, artist_mbid, pop_begin, pop_end, max_recordings_per_artis
             })
 
         for artist in artists:
-            artists[artist] = select_recordings_on_popularity(artists[artist], pop_begin, pop_end, num_recordings)
+            artists[artist] = select_recordings_on_popularity(artists[artist], pop_begin, pop_end, max_recordings_per_artist)
 
-        return artists
+        return artists, []

troi/content_resolver/subsonic.py

@@ -136,8 +136,9 @@ def run_sync(self):
                     "release_mbid": album_mbid,
                     "recording_mbid": song["musicBrainzId"],
                     "duration": song["duration"] * 1000,
-                    "track_num": song["track"],
-                    "disc_num": song["discNumber"],
+                    # Neither track number nor disc number are guaranteed for subsonic
+                    "track_num": song.get("track", 1),
+                    "disc_num": song.get("discNumber", 1),
                     "subsonic_id": song["id"],
                     "mtime": datetime.datetime.now()
                     })

troi/patches/lb_radio_classes/artist.py

@@ -52,7 +52,8 @@ def read(self, entities):
 
             try:
                 similar_artist_names.append(artist_recordings[mbid][0].artist_credit.name)
-            except IndexError:
+                # The item may not exist, or the artist credit may be None
+            except (AttributeError, IndexError):
                 pass
 
         # craft user feedback messages