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我需要运行一个子进程,然后它将在后台运行;同时,我想操纵它的输出(添加时间戳等)并将其重定向到特定文件。 目前,我这样做:运行一个进程并将stdin/strout重定向到特定文件
try {
var out = fs.createWriteStream(`${this.logdir}/${lp}-out.log`, { flags: 'a', defaultEncoding: 'utf8' });
var err = fs.createWriteStream(`${this.logdir}/${lp}-err.log`, { flags: 'a', defaultEncoding: 'utf8' });
} catch(e){
console.log("Could not open log files for writing:", e);
return;
}
try {
var child = childProcess.spawn('/usr/bin/node', [ server ], { env: env, uid: uid, gid: gid, cwd: cwd });
} catch(e) {
console.log("Could not run node:", e);
return;
}
child.stdout.on('data', function(data){
try {
// The child process has stopped dealing with incoming connections.
// For all intents and purposes, the process is useless and dead
var d = data.toString();
if(data.toString().match(/^THE SERVER HAS STOPPED$/m)){
console.log("The child process has stopped taking connections!");
try { fs.unlinkSync(pidFile); } catch(e){}
dead = true;
maybeRestart();
}
var pre = (new Date()).toString() + ' [' + child.pid + '] ';
out.write(Buffer.from(data.toString().trim().split("\n").map((l,i) => { return pre + l }) .join('\n') + '\n'));
} catch(e){
console.log("Error while redirecting stream to standard output!", e);
}
});
child.stderr.on('data', function(data){
try {
var pre = (new Date()).toString() + ' [' + child.pid + '] ';
err.write(Buffer.from(data.toString().trim().split("\n").map((l,i) => { return pre + l }) .join('\n') + '\n'));
} catch(e){
console.log("Error while redirecting stream to standard error!", e);
}
});
问题:
- 我是新来的流。我做对了吗?如果没有,那么做到这一点的“正确”方式是什么?
- 我注意到流的“数据”回调中的错误不会冒泡 - 甚至不是
UnexpectedError
s,因此try {} catch {}
声明。那是正确的路吗?
不,对不起,这个过程将永远运行... – Merc