确定服务器是否已经在侦听 unix 域套接字的路径 [英] Determine if server is already listening on path to unix domain socket

问题描述

在 Node.js 版本 10+ 上

On Node.js version 10+

假设我们有一个服务器在监听一个路径(unix 域套接字):

Say we have a server listening on a path (unix domain sockets):

const server = net.createServer(socket => {

});

const p = path.resolve(process.env.HOME + '/unix.sock');
server.listen(p);

在运行上述代码之前，有没有办法确定其他服务器是否已经在侦听路径 p?

is there a way to determine if some other server is already listening on path p, before running the above code?

推荐答案

我现有的答案的替代方案是创建客户端并尝试连接到服务器.根据结果​​可以判断是否占用了unix socket.

An alternative to my existing answer would be creating a client and trying to connect to the server. Based on the result, you can identify whether the unix socket is taken or not.

function isPortTaken(port, fn) {

    var net = require('net');

    var client = new net.Socket();
    client.connect(port, function(err) {
        if(err)
            return fn(false)

        client.destroy();
        fn(true);

    });

}

警告:如果服务器在新连接上触发某些操作，这将触发它.

Warning: In case the server triggers some action on a new connection, this will trigger it.

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