improved error catching on get_ext_metadata()

reorganize LoadedStream and Metrics definitions for better external referencing

librespot/audio/__init__.py

@@ -331,7 +331,7 @@ class CdnFeedHelper:
             session: Session, track: Metadata.Track, file: Metadata.AudioFile,
             resp_or_url: typing.Union[StorageResolve.StorageResolveResponse,
                                       str], preload: bool,
-            halt_listener: HaltListener) -> PlayableContentFeeder.LoadedStream:
+            halt_listener: HaltListener) -> LoadedStream:
         if type(resp_or_url) is str:
             url = resp_or_url
         else:
@@ -345,18 +345,17 @@ class CdnFeedHelper:
         normalization_data = NormalizationData.read(input_stream)
         if input_stream.skip(0xA7) != 0xA7:
             raise IOError("Couldn't skip 0xa7 bytes!")
-        return PlayableContentFeeder.LoadedStream(
+        return LoadedStream(
             track,
             streamer,
             normalization_data,
-            PlayableContentFeeder.Metrics(file.file_id, preload,
-                                          -1 if preload else audio_key_time),
+            file.file_id, preload, audio_key_time
         )
 
     @staticmethod
     def load_episode_external(
             session: Session, episode: Metadata.Episode,
-            halt_listener: HaltListener) -> PlayableContentFeeder.LoadedStream:
+            halt_listener: HaltListener) -> LoadedStream:
         resp = session.client().head(episode.external_url)
 
         if resp.status_code != 200:
@@ -368,11 +367,11 @@ class CdnFeedHelper:
 
         streamer = session.cdn().stream_external_episode(
             episode, url, halt_listener)
-        return PlayableContentFeeder.LoadedStream(
+        return LoadedStream(
             episode,
             streamer,
             None,
-            PlayableContentFeeder.Metrics(None, False, -1),
+            None, False, -1
         )
 
     @staticmethod
@@ -383,7 +382,7 @@ class CdnFeedHelper:
         resp_or_url: typing.Union[StorageResolve.StorageResolveResponse, str],
         preload: bool,
         halt_listener: HaltListener,
-    ) -> PlayableContentFeeder.LoadedStream:
+    ) -> LoadedStream:
         if type(resp_or_url) is str:
             url = resp_or_url
         else:
@@ -397,12 +396,11 @@ class CdnFeedHelper:
         normalization_data = NormalizationData.read(input_stream)
         if input_stream.skip(0xA7) != 0xA7:
             raise IOError("Couldn't skip 0xa7 bytes!")
-        return PlayableContentFeeder.LoadedStream(
+        return LoadedStream(
             episode,
             streamer,
             normalization_data,
-            PlayableContentFeeder.Metrics(file.file_id, preload,
-                                          -1 if preload else audio_key_time),
+            file.file_id, preload, audio_key_time
         )
 
 
@@ -850,29 +848,13 @@ class PlayableContentFeeder:
         storage_resolve_response.ParseFromString(body)
         return storage_resolve_response
 
-    class LoadedStream:
-        episode: Metadata.Episode
-        track: Metadata.Track
-        input_stream: GeneralAudioStream
-        normalization_data: NormalizationData
-        metrics: PlayableContentFeeder.Metrics
 
-        def __init__(self, track_or_episode: typing.Union[Metadata.Track,
-                                                          Metadata.Episode],
-                     input_stream: GeneralAudioStream,
-                     normalization_data: typing.Union[NormalizationData, None],
-                     metrics: PlayableContentFeeder.Metrics):
-            if type(track_or_episode) is Metadata.Track:
-                self.track = track_or_episode
-                self.episode = None
-            elif type(track_or_episode) is Metadata.Episode:
-                self.track = None
-                self.episode = track_or_episode
-            else:
-                raise TypeError()
-            self.input_stream = input_stream
-            self.normalization_data = normalization_data
-            self.metrics = metrics
+class LoadedStream:
+    episode: Metadata.Episode
+    track: Metadata.Track
+    input_stream: GeneralAudioStream
+    normalization_data: NormalizationData
+    metrics: Metrics
 
     class Metrics:
         file_id: str
@@ -880,13 +862,27 @@ class PlayableContentFeeder:
         audio_key_time: int
 
         def __init__(self, file_id: typing.Union[bytes, None],
-                     preloaded_audio_key: bool, audio_key_time: int):
+                        preloaded_audio_key: bool, audio_key_time: int):
             self.file_id = None if file_id is None else util.bytes_to_hex(
                 file_id)
             self.preloaded_audio_key = preloaded_audio_key
-            self.audio_key_time = audio_key_time
-            if preloaded_audio_key and audio_key_time != -1:
-                raise RuntimeError()
+            self.audio_key_time = -1 if preloaded_audio_key else audio_key_time
+
+    def __init__(self, track_or_episode: typing.Union[Metadata.Track, Metadata.Episode],
+                    input_stream: GeneralAudioStream,
+                    normalization_data: typing.Union[NormalizationData, None],
+                    file_id: str, preloaded_audio_key: bool, audio_key_time: int):
+        if type(track_or_episode) is Metadata.Track:
+            self.track = track_or_episode
+            self.episode = None
+        elif type(track_or_episode) is Metadata.Episode:
+            self.track = None
+            self.episode = track_or_episode
+        else:
+            raise TypeError()
+        self.input_stream = input_stream
+        self.normalization_data = normalization_data
+        self.metrics = self.Metrics(file_id, preloaded_audio_key, audio_key_time)
 
 
 class StreamId:

librespot/core.py

@@ -202,11 +202,14 @@ class ApiClient(Closeable):
 
         body = response.content
         if body is None:
-            raise RuntimeError()
+            raise ConnectionError("Extended Metadata request failed: No response body")
 
         proto = BatchedExtensionResponse()
         proto.ParseFromString(body)
-        mdb: bytes = proto.extended_metadata.pop().extension_data.pop().extension_data.value
+        entityextd = proto.extended_metadata.pop().extension_data.pop()
+        if entityextd.header.status_code != 200:
+            raise ConnectionError("Extended Metadata request failed: Status code {}".format(entityextd.header.status_code))
+        mdb: bytes = entityextd.extension_data.value
         return mdb
 
     def get_metadata_4_track(self, track: TrackId) -> Metadata.Track: