RabbitMQ 消息隊列

PYthreading Queue進程Queue 父進程與子進程，或同一父進程下的多個子進程進行交互缺點：兩個不同Python文件不能通過上面兩個Queue進行交互

erlong基于這個語言創建的一種中間商win中需要先安裝erlong才能使用rabbitmq_server start

安裝 Python module

pip install pika

or

easy_install pika

or源碼

rabbit 默認端口15672查看當前時刻的隊列數rabbitmqctl.bat list_queue

exchange在定義的時候就是有類型的，決定到底哪些queue符合條件，可以接受消息fanout：所有bind到此exchange的queue都可以收到消息direct：通過routingkey和exchange決定唯一的queue可以接受消息topic： 所有符合routingkey（此時可以是一個表達式）的routingkey所bind的queue都可以接受消息 表達式符號說明： # 代表一個或多個字符 * 代表任何字符

RPCremote procedure call 雙向傳輸，指令<-------->指令執行結果實現方法：創建兩個隊列，一個隊列收指令，一個隊列發送執行結果

用rabbitmq實現簡單的生產者消費者模型

1） rabbit_producer.py

# Author : Xuefengimport pikaconnection = pika.BlockingConnection(pika.Connection.Parameters( 'localhost'))# statement a channelchannel = connection.channel()# create the queue, the name of queue is 'hello'# durable=True can make the queue be exist, although the service have stopped before.channel.queue_declare(queue='hello', durable=True)# n RabbitMQ a message can never be sent directly to queue,it always need to go throughchannel.basic_publish(exchange = ' ', routing_key = 'hello', body = 'Hello world!', properties = pika.BasicPropreties( delivery_mode=2, # make the message persistence ) )print('[x] sent ’Hello world!’')connection.close()

2） rabbit_consumer.py

# Author : Xuefengimport pikaconnection = pika.BlockingConnection(pika.Connection.Parameters( 'localhost'))# statement a channelchannel = connection.channel()channel.queue_declare(queue='hello', durable=True)def callback(ch, method, properties, body): ’’’ Handle the recieved data :param ch: The address of the channel :param method: Information about the connection :param properties: :param body: :return: ’’’ print('------>', ch, method, properties ) print('[x] Recieved %r' % body) # ack by ourself ch.basic_ack(delivery_tag = method.delivery_tag)# follow is for consumer to auto change with the abilitychannel.basic_qos(profetch_count=1)# no_ack = True represent that the message cannot be transfor to next consumer,# when the current consumer is stop by accident.channel.basic_consume(callback, # If have recieved message, enable the callback() function to handle the message. queue = 'hello', no_ack = True)print('[*] Waiting for messages. To Exit press CTRL+C')channel.start_consuming()

用rabbitmq中的fanout模式實現廣播模式

1） fanout_rabbit_publish.py

# Author : Xuefengimport pikaimport sys# 廣播模式：# 生產者發送一條消息，所有的開通鏈接的消費者都可以接收到消息connection = pika.BlockingConnection(pika.Connection.Parameters( 'localhost'))# statement a channelchannel = connection.channel()channel.exchange_declare(exchange='logs', type='fanout')message = ’ ’.join(sys.argv[1:]) or 'info:Hello world!'channel.basic_publish( exchange='logs', routing_key='', body=message)print('[x] Send %r' % message)connection.close()

2） fanout_rabbit_consumer.py

# Author : Xuefengimport pikaimport sysconnection = pika.BlockingConnection(pika.Connection.Parameters( 'localhost'))# statement a channelchannel = connection.channel()# exclusive 排他，唯一的 隨機生成queueresult = channel.queue_declare(exclusive=True)queue_name = result.method.queueprint('Random queue name:', queue_name)channel.queue_bind(exchange='logs', queue=queue_name)def callback(ch, method, properties, body): ’’’ Handle the recieved data :param ch: The address of the channel :param method: Information about the connection :param properties: :param body: :return: ’’’ print('------>', ch, method, properties ) print('[x] Recieved %r' % body) # ack by ourself ch.basic_ack(delivery_tag = method.delivery_tag)# no_ack = True represent that the message cannot be transfor to next consumer,# when the current consumer is stop by accident.channel.basic_consume(callback, # If have recieved message, enable the callback() function to handle the message. queue = 'hello', no_ack = True)print('[*] Waiting for messages. To Exit press CTRL+C')channel.start_consuming()

用rabbitmq中的direct模式實現消息過濾模式

1） direct_rabbit_publisher.py

# Author : Xuefengimport pikaimport sys# 消息過濾模式：# 生產者發送一條消息，通過severity優先級來確定是否可以接收到消息connection = pika.BlockingConnection(pika.Connection.Parameters( 'localhost'))# statement a channelchannel = connection.channel()channel.exchange_declare(exchange='direct_logs', type='direct')severity = sys.argv[1] if len(sys.argv) > 1 else 'info'message = ’ ’.join(sys.argv[2:]) or 'info:Hello world!'channel.basic_publish( exchange='direct_logs', routing_key=severity, body=message)print('[x] Send %r:%r' % (severity, message))connection.close()

2） direct_rabbit_consumer.py

# Author : Xuefengimport pikaimport sysconnection = pika.BlockingConnection(pika.Connection.Parameters( 'localhost'))# statement a channelchannel = connection.channel()channel.exchange_declare(exchange='direct_logs', type='direct')# exclusive 排他，唯一的 隨機生成queueresult = channel.queue_declare(exclusive=True)queue_name = result.method.queueprint('Random queue name:', queue_name)severities = sys.argv[1:]if not severities: sys.stderr.write('Usage:%s [info] [warning] [error]n' % sys.argv[0]) sys.exit(1)for severity in severities: channel.queue_bind(exchange='direct_logs', queue=queue_name, routing_key=severity) def callback(ch, method, properties, body): ’’’ Handle the recieved data :param ch: The address of the channel :param method: Information about the connection :param properties: :param body: :return: ’’’ print('------>', ch, method, properties ) print('[x] Recieved %r' % body) # ack by ourself ch.basic_ack(delivery_tag = method.delivery_tag)# no_ack = True represent that the message cannot be transfor to next consumer,# when the current consumer is stop by accident.channel.basic_consume(callback, # If have recieved message, enable the callback() function to handle the message. queue = 'hello', no_ack = True)print('[*] Waiting for messages. To Exit press CTRL+C')channel.start_consuming()

用rabbitmq中的topic模式實現細致消息過濾模式

1） topic_rabbit_publisher.py

# Author : Xuefengimport pikaimport sys# 消息細致過濾模式：# 生產者發送一條消息，通過運行腳本 *.info 等確定接收消息類型進行對應接收connection = pika.BlockingConnection(pika.Connection.Parameters( 'localhost'))# statement a channelchannel = connection.channel()channel.exchange_declare(exchange='topic_logs', type='topic')binding_key = sys.argv[1] if len(sys.argv) > 1 else 'info'message = ’ ’.join(sys.argv[2:]) or 'info:Hello world!'channel.basic_publish( exchange='topic_logs', routing_key=binding_key, body=message)print('[x] Send %r:%r' % (binding_key, message))connection.close()

2） topic_rabbit_consumer.py

# Author : Xuefengimport pikaimport sysconnection = pika.BlockingConnection(pika.Connection.Parameters( 'localhost'))# statement a channelchannel = connection.channel()channel.exchange_declare(exchange='topic_logs', type='topic')# exclusive 排他，唯一的 隨機生成queueresult = channel.queue_declare(exclusive=True)queue_name = result.method.queueprint('Random queue name:', queue_name)binding_keys = sys.argv[1:]if not binding_keys: sys.stderr.write('Usage:%s [info] [warning] [error]n' % sys.argv[0]) sys.exit(1)for binding_key in binding_keys: channel.queue_bind(exchange='topic_logs', queue=queue_name, routing_key=binding_key)def callback(ch, method, properties, body): ’’’ Handle the recieved data :param ch: The address of the channel :param method: Information about the connection :param properties: :param body: :return: ’’’ print('------>', ch, method, properties) print('[x] Recieved %r' % body) # ack by ourself ch.basic_ack(delivery_tag=method.delivery_tag)# no_ack = True represent that the message cannot be transfor to next consumer,# when the current consumer is stop by accident.channel.basic_consume(callback, # If have recieved message, enable the callback() function to handle the message. queue='hello', no_ack=True)print('[*] Waiting for messages. To Exit press CTRL+C')channel.start_consuming()

用rabbitmq實現rpc操作

1） Rpc_rabbit_client.py

# Author : Xuefengimport pikaimport timeimport uuidclass FibonacciRpcClient(object): def __init__(self): self.connection = pika.BlockingConnection(pika.Connection.Parameters( 'localhost')) self.channel = self.connection.channel() result = self.channel.queue_declare(exclusive=True) self.callback_queue = result.method.queue # 隨機的生成一個接收命令執行結果的隊列 self.channel.basic_consume(self.on_response, # 只要收到消息就調用 no_ack=True, queue=self.callback_queue) def on_response(self, ch, method, props, body): if self.corr_id == props.correlation_id: self.response = body def call(self,n): self.response = None self.corr_id = str(uuid.uuid4()) self.channel.basic_publish( exchange='', routing_key='rpc_queue', properties=pika.BasicPropreties( rely_to=self.callback_queue, correlation_id=self.corr_id # 通過隨機生成的ID來驗證指令執行結果與指令的匹配性 ), body=str(n) ) while self.response is None: self.connection.process_data_events() # 非阻塞版的start_consume，有沒有消息都繼續 print('no message...') time.sleep(0.5) return int(self.response)fibonacci_rcp = FibonacciRpcClient()print('[x] Requesting fib(30)')response = fibonacci_rcp.call(30)print('[x] Rec %r' % response)

2） Rpc_rabbit_server.py

# Author : Xuefengimport pikaimport sysconnection = pika.BlockingConnection(pika.Connection.Parameters( 'localhost'))# statement a channelchannel = connection.channel()channel.queue_declare(queue='rpc_queue')def fib(n): if n == 0: return 0 elif n == 1: return 1 else: return fib(n-1)+fib(n-2)def on_request(ch, method, props, body): n = int(body) print('[.] fib(%s)' % n) response = fib(n) ch.basic_publish( exchange='', routing_key=props.rely_to, properties=pika.BasicPropreties(correlation_id= props.correlation), body = str(body) ) ch.basic_ack(delivery_tag=method.delivery_tag)channel.basic_qos(prefetch_count=1)channel.basic_consume(on_request, queue='rpc_queue')print('[x] Awaiting RPC requests')channel.start_consumeing()channel.exchange_declare(exchange='direct_logs', type='direct')# exclusive 排他，唯一的 隨機生成queueresult = channel.queue_declare(exclusive=True)queue_name = result.method.queueprint('Random queue name:', queue_name)severities = sys.argv[1:]

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