| 30 | |
| 31 | |
| 32 | class TriggerWatcher(ConsumerMixin): |
| 33 | |
| 34 | sleep_interval = 0 # sleep to co-operatively yield after processing each message |
| 35 | |
| 36 | def __init__( |
| 37 | self, |
| 38 | create_handler, |
| 39 | update_handler, |
| 40 | delete_handler, |
| 41 | trigger_types=None, |
| 42 | queue_suffix=None, |
| 43 | exclusive=False, |
| 44 | ): |
| 45 | """ |
| 46 | :param create_handler: Function which is called on TriggerDB create event. |
| 47 | :type create_handler: ``callable`` |
| 48 | |
| 49 | :param update_handler: Function which is called on TriggerDB update event. |
| 50 | :type update_handler: ``callable`` |
| 51 | |
| 52 | :param delete_handler: Function which is called on TriggerDB delete event. |
| 53 | :type delete_handler: ``callable`` |
| 54 | |
| 55 | :param trigger_types: If provided, handler function will only be called |
| 56 | if the trigger in the message payload is included |
| 57 | in this list. |
| 58 | :type trigger_types: ``list`` |
| 59 | |
| 60 | :param exclusive: If the Q is exclusive to a specific connection which is then |
| 61 | single connection created by TriggerWatcher. When the connection |
| 62 | breaks the Q is removed by the message broker. |
| 63 | :type exclusive: ``bool`` |
| 64 | """ |
| 65 | # TODO: Handle trigger type filtering using routing key |
| 66 | self._create_handler = create_handler |
| 67 | self._update_handler = update_handler |
| 68 | self._delete_handler = delete_handler |
| 69 | self._trigger_types = trigger_types |
| 70 | self._trigger_watch_q = self._get_queue(queue_suffix, exclusive=exclusive) |
| 71 | |
| 72 | self.connection = None |
| 73 | self._load_thread = None |
| 74 | self._updates_thread = None |
| 75 | |
| 76 | self._handlers = { |
| 77 | publishers.CREATE_RK: create_handler, |
| 78 | publishers.UPDATE_RK: update_handler, |
| 79 | publishers.DELETE_RK: delete_handler, |
| 80 | } |
| 81 | |
| 82 | def get_consumers(self, Consumer, channel): |
| 83 | return [ |
| 84 | Consumer( |
| 85 | queues=[self._trigger_watch_q], |
| 86 | accept=["pickle"], |
| 87 | callbacks=[self.process_task], |
| 88 | ) |
| 89 | ] |