Question

我正在使用TLS模块在node.js中创建一个简单的服务器。到目前为止，客户端能够连接，发送数据和断开与服务器的连接。但是，我想在断开与服务器的连接时打印客户端的IP地址。就目前而言，我能够从事件回调函数外部打印客户端的IP地址，但我不能在回调中执行此操作（检查on('end)）。

var tls = require('tls');
var fs = require('fs');

var server = tls.createServer({
    key: fs.readFileSync('server-key.pem'),
    cert: fs.readFileSync('server-cert.pem'),
}, function(cleartextStream) {
    cleartextStream.setEncoding('utf8');

    /*
     * Error receiving data.
     */
    cleartextStream.on('error', function (exception) {

    });

    /*
     * Signal that it is safe to write again.
     */
    cleartextStream.on('drain', function () {

    });

    /*
     * New data received.
     */
    cleartextStream.on('data', function (data) {
        console.log('New data: '+data);
    });

    /*
     * Remote client disconnected.
     */
    console.log(cleartextStream.remoteAddress); // This prints the IP address correctly.

    cleartextStream.on('end', function () {
        console.log(cleartextStream.remoteAddress); // This prints undefined.
    });

    /*
     * Server is shutting down.
     */
    cleartextStream.on('close', function () {

    });
});

server.listen(8000, function() {
  console.log('Server listening.');
});

Answer 1

在remoteAddress事件触发之前，cleartextStream的{{1}}属性似乎已被移除。因此，捕获远程地址，使其在'end'事件回调中仍然可用：

'end'

回调函数的变量范围

1 个答案: