def notify(cur, channel, payload=None):
assert helpers.valid_channel(channel)
s = 'NOTIFY {}{}{};'
return cur.mogrify(s.format(
str(channel),
(', ' if payload is not None else ''),
(repr(json.dumps(payload) if payload is not None else ''))
))
def register_listen(self, channel, callback):
assert helpers.valid_channel(channel)
self._registrar[channel] = callback
with self.conn.cursor() as cur:
cur.execute("LISTEN {};".format(channel))
