playlist_manager: Cache playlist entry IDs along with video IDs

This is required in order to be able to move entries later.
Note our view of entry IDs may always be out of date, so any time you use one
you have to handle it no longer existing.

playlist_manager/playlist_manager/main.py

@@ -14,6 +14,9 @@ from common.database import DBManager, query
 from common.googleapis import GoogleAPIClient
 
 
+PlaylistEntry = namedtuple("PlaylistEntry", ["entry_id", "video_id"])
+
+
 class PlaylistManager(object):
 
 	def __init__(self, dbmanager, api_client, upload_locations, playlist_tags):
@@ -30,7 +33,7 @@ class PlaylistManager(object):
 		if playlist_id is None:
 			# playlist_state represents our mirrored view of the list of items in each playlist.
 			# If a playlist is not present, it means we need to refresh our view of it.
-			# {playlist_id: [video_id]}
+			# {playlist_id: [PlaylistEntry]}
 			self.playlist_state = {}
 		else:
 			self.playlist_state.pop(playlist_id, None)
@@ -112,7 +115,7 @@ class PlaylistManager(object):
 		# If we have nothing to add, short circuit without doing any API calls to save quota.
 
 		matching_video_ids = {video.video_id for video in matching}
-		playlist_video_ids = set(self.get_playlist(playlist_id))
+		playlist_video_ids = {entry.video_id for entry in self.get_playlist(playlist_id)}
 		if not (matching_video_ids - playlist_video_ids):
 			logging.debug("All videos already in playlist, nothing to do")
 			return
@@ -120,7 +123,7 @@ class PlaylistManager(object):
 		self.refresh_playlist(playlist_id)
 		# Get an updated list of new videos
 		matching_video_ids = {video.video_id for video in matching}
-		playlist_video_ids = set(self.get_playlist(playlist_id))
+		playlist_video_ids = {entry.video_id for entry in self.get_playlist(playlist_id)}
 		# It shouldn't matter, but just for clarity let's sort them by event order
 		new_videos = sorted(matching_video_ids - playlist_video_ids, key=lambda v: v.start_time)
 
@@ -154,8 +157,11 @@ class PlaylistManager(object):
 		query.fetch_all()
 		# Update saved copy with video ids
 		self.playlist_state[playlist_id] = [
-			item['snippet']['resourceId'].get('videoId') # api implies it's possible that non-videos are added
-			for item in query.items
+			PlaylistEntry(
+				item['id'],
+				# api implies it's possible that non-videos are added, so videoId might not exist
+				item['snippet']['resourceId'].get('videoId'),
+			) for item in query.items
 		]
 
 	def find_insert_index(self, videos, playlist, new_video):
@@ -168,7 +174,7 @@ class PlaylistManager(object):
 		# item that should be after us in sort order.
 		# Note that we treat unknown items (videos we don't know) as being before us
 		# in sort order, so that we always insert after them.
-		for n, video_id in enumerate(playlist):
+		for n, (_, video_id) in enumerate(playlist):
 			if video_id not in videos:
 				# ignore unknowns
 				continue
@@ -185,9 +191,9 @@ class PlaylistManager(object):
 		Makes the API call then also updates our mirrored copy.
 		"""
 		logging.info(f"Inserting {video_id} at index {index} of {playlist_id}")
-		self.api.insert_into_playlist(playlist_id, video_id, index)
+		entry_id = self.api.insert_into_playlist(playlist_id, video_id, index)
 		# Update our copy
-		self.playlist_state.setdefault(playlist_id, []).insert(index, video_id)
+		self.playlist_state.setdefault(playlist_id, []).insert(index, PlaylistEntry(entry_id, video_id)
 
 
 class YoutubeAPI(object):
@@ -218,6 +224,7 @@ class YoutubeAPI(object):
 			raise Exception("Failed to insert {video_id} at index {index} of {playlist} with {resp.status_code}: {resp.content}".format(
 				playlist=playlist_id, video_id=video_id, index=index, resp=resp,
 			))
+		# TODO return entry_id from resp
 
 	def list_playlist(self, playlist_id):
 		"""Fetches the first page of playlist contents and returns a ListQuery object.