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| import uuid | |
| from ditk import logging | |
| from time import sleep | |
| from typing import Tuple | |
| import redis | |
| from ding.framework.message_queue.mq import MQ | |
| from ding.utils import MQ_REGISTRY | |
| class RedisMQ(MQ): | |
| def __init__(self, redis_host: str, redis_port: int, **kwargs) -> None: | |
| """ | |
| Overview: | |
| Connect distributed processes with redis | |
| Arguments: | |
| - redis_host (:obj:`str`): Redis server host. | |
| - redis_port (:obj:`int`): Redis server port. | |
| """ | |
| self.host = redis_host | |
| self.port = redis_port if isinstance(redis_port, int) else int(redis_port) | |
| self.db = 0 | |
| self._running = False | |
| self._id = uuid.uuid4().hex.encode() | |
| def listen(self) -> None: | |
| self._client = client = redis.Redis(host=self.host, port=self.port, db=self.db) | |
| self._sub = client.pubsub() | |
| self._running = True | |
| def publish(self, topic: str, data: bytes) -> None: | |
| data = self._id + b"::" + data | |
| self._client.publish(topic, data) | |
| def subscribe(self, topic: str) -> None: | |
| self._sub.subscribe(topic) | |
| def unsubscribe(self, topic: str) -> None: | |
| self._sub.unsubscribe(topic) | |
| def recv(self) -> Tuple[str, bytes]: | |
| while True: | |
| if not self._running: | |
| raise RuntimeError("Redis MQ was not running!") | |
| try: | |
| msg = self._sub.get_message(ignore_subscribe_messages=True) | |
| if msg is None: | |
| sleep(0.001) | |
| continue | |
| topic = msg["channel"].decode() | |
| data = msg["data"].split(b"::", maxsplit=1) | |
| if len(data) != 2 or len(data[0]) != 32: | |
| logging.warn("Got invalid message from topic: {}".format(topic)) | |
| continue | |
| node_id, data = data | |
| if node_id == self._id: # Discard message sent by self | |
| continue | |
| return topic, data | |
| except (OSError, AttributeError, Exception) as e: | |
| logging.error("Meet exception when listening for new messages", e) | |
| def stop(self) -> None: | |
| if self._running: | |
| self._running = False | |
| self._sub.close() | |
| self._client.close() | |
| def __del__(self) -> None: | |
| self.stop() | |