amqp queue
Install rabbitmq
brew install rabbitmq;
Need to configure environment variables
export AMQP_HOME=/usr/local/Cellar/rabbitmq/3.8.3/sbin
export PATH="${AMQP_HOME}:${PATH}"
rabbitmq-defaults rabbitmq-plugins rabbitmq-upgrade
rabbitmq-diagnostics rabbitmq-queues rabbitmqadmin
rabbitmq-env rabbitmq-server rabbitmqctl
Start service
rabbimq-server
After starting the service, you can visit localhost:15672, edit configuration and other functions.
- vhost Here you can pay attention to this, guest defaults to "/"
Out of service
rabbitmqctl stop
Install ampqlib
Create connection connect and create channel channel
const url = 'amqp://test:test@localhost:5672/test';
const conn = await amqp.connect(url);
const channel = await conn.createChannel();
Create queue
const queueOptions = {
durable: true //true 持久的队列
}
const queueName = 'test'
channel.assertQueue(queueName,queueOptions);
The producer sends a message to the queue sendToQueue
channel.sendToQueue(queueName, Buffer.from(StringMsg), {
persistent: true, //可靠性提升
//exclusive: true// 断开后会丢失
});
Consumer receives messages
channel.prefetch(1) //在没确认之前不接受新的消息
channel.consume(queueName, function(msg){
//msg.content.toString() == StringMsg;
channel.ack(msg);
}, {
noAck: false //不自动确认
})
Switch fanout
The producer sends the message to the exchange, and the consumer gets the queue message from the specified exchange
- Producer
const exchangeName = 'exone'
//生产者
channel.assertExchange(exchangeName, 'fanout', {
durable: false
});
channel.publish(exchangeName,'', Buffer.from('publishMsg'));
- consumer
channel.assertExchange(exchange, 'fanout', {
durable: false
});
await channel.assertQueue(queueName, queueOptions);
channel.bindQueue(queueName, exchangeName, '');
channel.consume(queueName, function(msg){
channel.ack(msg)
},{
noAck: false
})
Switch direct
- Producer
const routerName = 'router'
channel.assertExchange(exchange, 'direct', {
durable: false
});
for(let i =0; i<100; i++){
let routerName = Math.random()>.5 ? 'blue' : 'green';
const data = await ch.publish(exchangeName, routerName, Buffer.from('publish message' + s +'--'+ i));
}
- consumer
channel.assertQueue(queueName, {
durable: false});
channel.bindQueue(queueName, exchangeName, 'blue'); //只接收 router = blue的消息 如果想绑定多个 复制一行更改 routername就行
channel.consume(q.queue, function(msg){
console.log(msg.content.toString());
setTimeout(function(){
channel.ack(msg);
}, 40);
},{
noAck: false
})
Switch topic
Wildcard filter routeName
- abc.# matches abc.a, abc.ab, abc.aaa
- abc.* matches abc.a abc.b abc.aaa but not abc.ab;
The same match can be placed anywhere