sheetsync: Split playlist runloop from normal sheets

sheetsync/sheetsync/main.py

@@ -53,6 +53,15 @@ event_counts = prom.Gauge(
 	['sheet_name', 'category', 'poster_moment', 'state', 'errored'],
 )
 
+
+def wait(event, base, interval):
+	"""Wait until INTERVAL seconds after BASE, or until event is set."""
+	now = monotonic()
+	to_wait = base + common.jitter(interval) - now
+	if to_wait > 0:
+		event.wait(to_wait)
+
+
 class SheetSync(object):
 
 	# Time between syncs
@@ -75,7 +84,7 @@ class SheetSync(object):
 	# If playlist_worksheet is defined, add 1 to len(worksheets).
 	# For current values, this is 100/5 * 2 + 100/5/4 * 7 = 75
 
-	def __init__(self, stop, dbmanager, sheets, sheet_id, worksheets, edit_url, bustime_start, allocate_ids=False, playlist_worksheet=None):
+	def __init__(self, stop, dbmanager, sheets, sheet_id, worksheets, edit_url, bustime_start, allocate_ids=False):
 		self.stop = stop
 		self.dbmanager = dbmanager
 		self.sheets = sheets
@@ -85,8 +94,6 @@ class SheetSync(object):
 		self.edit_url = edit_url
 		self.bustime_start = bustime_start
 		self.allocate_ids = allocate_ids
-		# The playlist worksheet is checked on the same cadence as inactive sheets
-		self.playlist_worksheet = playlist_worksheet
 		# Maps DB column names (or general identifier, for non-DB columns) to sheet column indexes.
 		# Hard-coded for now, future work: determine this from column headers in sheet
 		self.column_map = {
@@ -149,13 +156,6 @@ class SheetSync(object):
 		bustime = common.parse_bustime(value)
 		return common.bustime_to_dt(self.bustime_start, bustime)
 
-	def wait(self, base, interval):
-		"""Wait until INTERVAL seconds after BASE."""
-		now = monotonic()
-		to_wait = base + common.jitter(interval) - now
-		if to_wait > 0:
-			self.stop.wait(to_wait)
-
 	def run(self):
 		self.conn = self.dbmanager.get_conn()
 
@@ -173,13 +173,11 @@ class SheetSync(object):
 				if sync_count % self.SYNCS_PER_INACTIVE_CHECK == 0:
 					# check all worksheets
 					worksheets = self.worksheets
-					playlist_worksheet = self.playlist_worksheet
 				else:
 					# only check most recently changed worksheets
 					worksheets = sorted(
 						self.worksheets.keys(), key=lambda k: self.worksheets[k], reverse=True,
 					)[:self.ACTIVE_SHEET_COUNT]
-					playlist_worksheet = None
 
 				sync_count += 1
 
@@ -214,9 +212,6 @@ class SheetSync(object):
 
 						self.sync_row(worksheet, row, events.get(row['id']))
 
-				if playlist_worksheet is not None:
-					rows = self.sheets.get_rows(self.sheet_id, playlist_worksheet)
-					self.sync_playlists(rows)
 			except Exception as e:
 				# for HTTPErrors, http response body includes the more detailed error
 				detail = ''
@@ -229,12 +224,12 @@ class SheetSync(object):
 				# 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()
-				self.wait(sync_start, self.ERROR_RETRY_INTERVAL)
+				wait(self.stop, sync_start, self.ERROR_RETRY_INTERVAL)
 			else:
 				logging.info("Successful sync of worksheets: {}".format(", ".join(worksheets)))
 				sheets_synced.inc()
 				sheet_sync_duration.observe(monotonic() - sync_start)
-				self.wait(sync_start, self.RETRY_INTERVAL)
+				wait(self.stop, sync_start, self.RETRY_INTERVAL)
 
 	def get_events(self):
 		"""Return the entire events table as a map {id: event namedtuple}"""
@@ -383,6 +378,49 @@ class SheetSync(object):
 		the most-recently-modified queue."""
 		self.worksheets[worksheet] = monotonic()
 
+
+class PlaylistSync:
+
+	# Time between syncs
+	RETRY_INTERVAL = 20
+
+	# Time to wait after getting an error
+	ERROR_RETRY_INTERVAL = 20
+
+	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()
+
+		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.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.inc()
+				sheet_sync_duration.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"""
@@ -395,7 +433,7 @@ class SheetSync(object):
 				show_in_description = ""
 			else:
 				continue
-			tags = self.column_parsers['tags'](tags)
+			tags = [tag.strip() for tag in tags.split(',') if tag.strip()]
 			if not tags:
 				continue
 			# special-case for the "all everything" list,
@@ -484,11 +522,26 @@ def main(dbconnect, sheets_creds_file, edit_url, bustime_start, sheet_id, worksh
 	sheets_creds = json.load(open(sheets_creds_file))
 
 	sheets = Sheets(
-        client_id=sheets_creds['client_id'],
-        client_secret=sheets_creds['client_secret'],
-        refresh_token=sheets_creds['refresh_token'],
+		client_id=sheets_creds['client_id'],
+		client_secret=sheets_creds['client_secret'],
+		refresh_token=sheets_creds['refresh_token'],
 	)
 
-	SheetSync(stop, dbmanager, sheets, sheet_id, worksheet_names, edit_url, bustime_start, allocate_ids, playlist_worksheet).run()
+	workers = [
+		SheetSync(stop, dbmanager, sheets, sheet_id, worksheet_names, edit_url, bustime_start, allocate_ids),
+	]
+	if playlist_worksheet:
+		workers.append(PlaylistSync(stop, dbmanager, sheets, sheet_id, playlist_worksheet))
+
+	jobs = [gevent.spawn(worker.run) for worker in workers]
+	# Block until any one exits
+	gevent.wait(jobs, count=1)
+	# Stop the others if they aren't stopping already
+	stop.set()
+	# Block until all have exited
+	gevent.wait(jobs)
+	# Call get() for each one to re-raise if any errored
+	for job in jobs:
+		job.get()
 
 	logging.info("Gracefully stopped")