'listening' 事件

• worker <cluster.Worker>
• address <Object>

当一个工作进程调用listen()后，工作进程上的server会触发'listening' 事件，同时主进程上的 cluster 也会被触发'listening'事件。

事件处理器使用两个参数来执行，其中worker包含了工作进程对象， address 包含了以下连接属性： address、 port 和 addressType。当工作进程同时监听多个地址时，这些参数非常有用。

cluster.on('listening', (worker, address) => {
  console.log(
    `A worker is now connected to ${address.address}:${address.port}`);
});

addressType 可选值包括:

• 4 (TCPv4)
• 6 (TCPv6)
• -1 (unix domain socket)
• "udp4" or "udp6" (UDP v4 or v6)

• worker <cluster.Worker>
• address <Object>

After calling listen() from a worker, when the 'listening' event is emitted on the server a 'listening' event will also be emitted on cluster in the master.

The event handler is executed with two arguments, the worker contains the worker object and the address object contains the following connection properties: address, port and addressType. This is very useful if the worker is listening on more than one address.

cluster.on('listening', (worker, address) => {
  console.log(
    `A worker is now connected to ${address.address}:${address.port}`);
});

The addressType is one of:

• 4 (TCPv4)
• 6 (TCPv6)
• -1 (unix domain socket)
• 'udp4' or 'udp6' (UDP v4 or v6)