javascript - 如何在node.js中杀死child_process——req.on close

Question

我试图在调用“requst.on('close' ”时终止子进程。但是此回调中的 child.pid 始终指向最近的请求。问题是:如何将 child.pid 与请求匹配？谢谢

var query_script = "query.py"
var express = require('express');
var app = express();
var spawn = require('child_process').spawn;

app.get('/:version/query', function(request, response) {
    child = spawn('python, ['query.py', request.originalUrl])
    console.log("start pid=" + child.pid + ": " + request.originalUrl)

    request.on('close', function () {
        console.log("1: current pid=" + child.pid)    
        //child.kill('SIGTERM');
    })

    child.stdout.pipe(response)
});

app.listen(3000);
console.log('Listening on port 3000...');

Answer 1

通过将 var 放在闭包中定义 child 前面。

var child = spawn('python, ['query.py', request.originalUrl])