本文提供使用 PYTHON SDK 收发延迟消息的示例代码供您参考。

发送延迟消息需要在控制台申请延迟消息类型的topic，rocketmq 5.x版本支持任意精度的延迟消息，发送延迟消息的示例代码如下。

import time
from rocketmq import ClientConfiguration, Credentials, Message, Producer
from datetime import datetime, timedelta

if __name__ == '__main__':
    # 火山接入点
    endpoints = "rocketmq-xxxx:8080"
    credentials = Credentials()
    # if auth enable, 火山ak,sk
    credentials = Credentials("xxxx", "xxxx")
    config = ClientConfiguration(endpoints, credentials)
    topic = "xxxx" # 延迟消息类型topic
    producer = Producer(config, (topic,))

    try:
        producer.startup()
        try:
            msg = Message()
            msg.topic = topic
            msg.body = "hello, rocketmq.".encode('utf-8')
            msg.tag = "rocketmq-send-delay-message"
            msg.keys = "send_sync"
            # 延迟时间
            msg.delivery_timestamp = int(time.mktime((datetime.now() + timedelta(seconds=30)).timetuple()))
            msg.add_property("send", "sync")
            res = producer.send(msg)
            print(f"{producer.__str__()} send message success. {res}")
            producer.shutdown()
            print(f"{producer.__str__()} shutdown.")
        except Exception as e:
            print(f"normal producer example raise exception: {e}")
            producer.shutdown()
    except Exception as e:
        print(f"{producer.__str__()} startup raise exception: {e}")
        producer.shutdown()

延迟消息的订阅方式与普通消息一致，示例代码如下所示。

from rocketmq import ClientConfiguration, Credentials, SimpleConsumer

if __name__ == '__main__':
    # 火山接入点    
    endpoints = "rocketmq-xxxx:8080"
    credentials = Credentials()
    # if auth enable, 火山ak,sk
    credentials = Credentials("xxxx", "xxxx")
    config = ClientConfiguration(endpoints, credentials)
    topic = "xxxx" # topic名称
    simple_consumer = SimpleConsumer(config, "groupName") # group name
    try:
        simple_consumer.startup()
        try:
            simple_consumer.subscribe(topic)
            # use tag filter
            # simple_consumer.subscribe(topic, FilterExpression("tag"))
            while True:
                try:
                    messages = simple_consumer.receive(32, 15)
                    if messages is not None:
                        print(f"{simple_consumer.__str__()} receive {len(messages)} messages.")
                        for msg in messages:
                            simple_consumer.ack(msg)
                            print(f"{simple_consumer.__str__()} ack message:[{msg.message_id}].")
                except Exception as e:
                    print(f"receive or ack message raise exception: {e}")
        except Exception as e:
            print(f"{simple_consumer.__str__()} subscribe topic:{topic} raise exception: {e}")
            simple_consumer.shutdown()
    except Exception as e:
        print(f"{simple_consumer.__str__()} startup raise exception: {e}")
        simple_consumer.shutdown()