我有一个环境,其中一些AMQP 1.0和一些AMQP 0.9.1客户端需要写入/读取RabbitMQ队列。我启用了AMQP 1.0 rabbit插件,它可以正常工作,但是我在每个AMQP 1.0消息的主体中获得了额外的字节。
我正在使用rhea
(typescript)通过AMQP 1.0发送消息:
const connection: Connection = new Connection (
{
host: 'localhost',
port: 5672,
id: 'my_id',
reconnect: true
}
);
const senderName = "sender01";
const senderOptions: SenderOptions = {
name: senderName,
target: {
address: "target.queue"
},
onError: (context: EventContext) => {},
onSessionError: (context: EventContext) => {}
};
await connection.open();
const sender: Sender = await connection.createSender(senderOptions);
sender.send({
body: JSON.stringify({"one": "two", "three": "four"}),
content_encoding: 'UTF-8',
content_type: 'application/json'
});
console.log("sent");
await sender.close();
await connection.close();
console.log("connection closed");
这个例子可以工作,但这是存储在队列中的内容:
base64编码的消息是AFN3oRx7Im9uZSI6InR3byIsInRocmVlIjoiZm91ciJ9
,解码后变为:
Sw{"one":"two","three":"four"}
有一个额外的Sw
,我没有发送。
我试着用官方的RabbitMQ库(它支持AMQP 0.9.1)设置一个java客户端,看看这些额外的字节是否被发送到客户端:
ConnectionFactory factory = new ConnectionFactory();
factory.setHost("localhost");
Connection connection = factory.newConnection();
Channel channel = connection.createChannel();
channel.basicConsume(
"target.queue",
true,
(consumerTag, delivery) -> {
String message = new String(delivery.getBody(), "UTF-8");
System.out.println(" [x] Received '" + message + "'");
},
ignored -> {}
);
这是输出:
[x] Received ' Sw�{"one":"two","three":"four"}'
奇怪的是,如果我尝试使用AMQP 1.0客户端消费完全相同的消息,这些额外的字节不会出现在收到的消息正文中,只有在使用AMQP 1.0发布和使用AMQP 0.9.1订阅时才会出现额外的字节。
为什么会这样?在使用两个AMQP版本时,有没有办法避免额外的字节?
更新
我也尝试了SwiftMQ:
int nMsgs = 100;
int qos = QoS.AT_MOST_ONCE;
AMQPContext ctx = new AMQPContext(AMQPContext.CLIENT);
String host = "localhost";
int port = 5672;
String queue = "target.queue";
try {
Connection connection = new Connection(ctx, host, port, false);
connection.setContainerId(UUID.randomUUID().toString());
connection.setIdleTimeout(-1);
connection.setMaxFrameSize(1024 * 4);
connection.setExceptionListener(Exception::printStackTrace);
connection.connect();
{
Session session = connection.createSession(10, 10);
Producer p = session.createProducer(queue, qos);
for (int i = 0; i < nMsgs; i++) {
AMQPMessage msg = new AMQPMessage();
System.out.println("Sending " + i);
msg.setAmqpValue(new AmqpValue(new AMQPString("{\"one\":\"two\",\"three\":\"four\"}")));
p.send(msg);
}
p.close();
session.close();
}
connection.close();
} catch (Exception e) {
e.printStackTrace();
}
问题仍然存在,但第一个字节发生了变化,现在我得到:
[x] Received '□�□□□□□□□w�{"one":"two","three":"four"}'
1条答案
按热度按时间qgzx9mmu1#
请参阅this response,它阐明了如何编码有效负载并避免这些额外的字节:
如果AMQP 1.0客户端向0-9-1客户端发送消息,并将其有效载荷编码为“数据段”中的二进制(即,不在amqp-序列部分,不在amqp-值部分),0-9-1客户端将获得完整的有效载荷,而没有任何额外的字节