sheetsync: Replace old special-case PlaylistSync with SheetSync subclass

sheetsync/sheetsync/main.py

@@ -10,7 +10,6 @@ import gevent.event
 import prometheus_client as prom
 from monotonic import monotonic
 from psycopg2 import sql
-from psycopg2.extras import execute_values
 from requests import HTTPError
 
 import common
@@ -18,7 +17,7 @@ import common.dateutil
 from common.database import DBManager, query, get_column_placeholder
 from common.sheets import Sheets as SheetsClient
 
-from .sheets import SheetsEventsMiddleware
+from .sheets import SheetsEventsMiddleware, SheetsPlaylistsMiddleware
 from .streamlog import StreamLogClient, StreamLogMiddleware
 
 sheets_synced = prom.Counter(
@@ -301,80 +300,20 @@ class EventsSync(SheetSync):
 
 		super().sync_row(sheet_row, db_row)
 
-class PlaylistSync:
 
-	# Time between syncs
-	RETRY_INTERVAL = 20
-
-	# Time to wait after getting an error
-	ERROR_RETRY_INTERVAL = 20
+class PlaylistsSync(SheetSync):
 
-	def __init__(self, stop, dbmanager, sheets, sheet_id, worksheet):
-		self.stop = stop
-		self.dbmanager = dbmanager
-		self.sheets = sheets
-		self.sheet_id = sheet_id
-		self.worksheet = worksheet
-
-	def run(self):
-		self.conn = self.dbmanager.get_conn()
+	# Slower poll rate than events to avoid using large amounts of quota
+	retry_interval = 20
+	error_retry_interval = 20
 
-		while not self.stop.is_set():
-			try:
-				sync_start = monotonic()
-				rows = self.sheets.get_rows(self.sheet_id, self.worksheet)
-				self.sync_playlists(rows)
-			except Exception as e:
-				# for HTTPErrors, http response body includes the more detailed error
-				detail = ''
-				if isinstance(e, HTTPError):
-					detail = ": {}".format(e.response.content)
-				logging.exception("Failed to sync{}".format(detail))
-				sync_errors.labels("playlists").inc()
-				# To ensure a fresh slate and clear any DB-related errors, get a new conn on error.
-				# This is heavy-handed but simple and effective.
-				# If we can't re-connect, the program will crash from here,
-				# then restart and wait until it can connect again.
-				self.conn = self.dbmanager.get_conn()
-				wait(self.stop, sync_start, self.ERROR_RETRY_INTERVAL)
-			else:
-				logging.info("Successful sync of playlists")
-				sheets_synced.labels("playlists").inc()
-				sheet_sync_duration.labels("playlists").observe(monotonic() - sync_start)
-				wait(self.stop, sync_start, self.RETRY_INTERVAL)
-
-	def sync_playlists(self, rows):
-		"""Parse rows with a valid playlist id and at least one tag,
-		overwriting the entire playlists table"""
-		playlists = []
-		for row in rows:
-			if len(row) == 5:
-				tags, _, name, playlist_id, show_in_description = row
-			elif len(row) == 4:
-				tags, _, name, playlist_id = row
-				show_in_description = ""
-			else:
-				continue
-			tags = [tag.strip() for tag in tags.split(',') if tag.strip()]
-			if not tags:
-				continue
-			# special-case for the "all everything" list,
-			# we don't want "no tags" to mean "all videos" so we need a sentinel value.
-			if tags == ["<all>"]:
-				tags = []
-			playlist_id = playlist_id.strip()
-			if len(playlist_id) != 34 or not playlist_id.startswith('PL'):
-				continue
-			show_in_description = show_in_description == "[✓]"
-			playlists.append((playlist_id, tags, name, show_in_description))
-		# We want to wipe and replace all the current entries in the table.
-		# The easiest way to do this is a DELETE then an INSERT, all within a transaction.
-		# The "with" block will perform everything under it within a transaction, rolling back
-		# on error or committing on exit.
-		logging.info("Updating playlists table with {} playlists".format(len(playlists)))
-		with self.conn:
-			query(self.conn, "DELETE FROM playlists")
-			execute_values(self.conn.cursor(), "INSERT INTO playlists(playlist_id, tags, name, show_in_description) VALUES %s", playlists)
+	table = "playlists"
+	input_columns = {
+		"playlist_id",
+		"tags",
+		"name",
+		"show_in_description",
+	}
 
 
 @argh.arg('dbconnect', help=
@@ -460,8 +399,14 @@ def main(dbconnect, sync_configs, metrics_port=8005, backdoor_port=0):
 				config.get("allocate_ids", False),
 			)
 			if "playlist_worksheet" in config:
+				middleware = SheetsPlaylistsMiddleware(
+					client,
+					config["sheet_id"],
+					[config["playlist_worksheet"]],
+					config.get("allocate_ids", False),
+				)
 				workers.append(
-					PlaylistSync(stop, dbmanager, client, config["sheet_id"], config["playlist_worksheet"])
+					PlaylistsSync("playlists", middleware, stop, dbmanager, config.get("reverse_sync", False))
 				)
 		elif config["type"] == "streamlog":
 			auth_token = open(config["creds"]).read().strip()