许多人都有这样一种映像,NodeJS比较快; 但是因为其是单线程,所以它不稳定,有点不安全,不适合处理复杂业务; 它比较适合对并发要求比较高,而且简单的业务场景。 事实上呢?
var http = require('http'); var server = http.createServer(function (req, res) { //这里有个错误,params 是 undefined var ok = req.params.ok; res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello World '); }); server.listen(8080, '127.0.0.1'); console.log('Server running at http://127.0.0.1:8080/');
$ node node-error Server running at http://127.0.0.1:8080/ c:githubscript ode-error.js:5 var ok = req.params.ok; ^ TypeError: Cannot read property 'ok' of undefined at Server.<anonymous> (c:githubscript ode-error.js:5:22) at Server.EventEmitter.emit (events.js:98:17) at HTTPParser.parser.onIncoming (http.js:2108:12) at HTTPParser.parserOnHeadersComplete [as onHeadersComplete] (http.js:121:23) at Socket.socket.ondata (http.js:1966:22) at TCP.onread (net.js:525:27)
怎么解决呢?
使用uncaughtException
process.on('uncaughtException', function (err) { //打印出错误 console.log(err); //打印出错误的调用栈方便调试 console.log(err.stack); });
使用 try/catch
var http = require('http'); http.createServer(function(req, res) { try { handler(req, res); } catch(e) { console.log(' ', e, ' ', e.stack); try { res.end(e.stack); } catch(e) { } } }).listen(8080, '127.0.0.1'); console.log('Server running at http://127.0.0.1:8080/'); var handler = function (req, res) { //Error Popuped var name = req.params.name; res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello ' + name); };
集成到框架中
Line: 207 try { handler(req, res); } catch(err) { var errorMsg = ' ' + 'Error ' + new Date().toISOString() + ' ' + req.url + ' ' + err.stack || err.message || 'unknow error' + ' ' ; console.error(errorMsg); Settings.showError ? res.end('<pre>' + errorMsg + '</pre>') : res.end(); }
守护NodeJS进程和记录错误日志
使用node来守护node
[sudo] npm install forever
$ forever start simple-server.js $ forever list [0] simple-server.js [ 24597, 24596 ]
forever -o out.log -e err.log my-script.js
使用shell启动脚本守护node
WEB_DIR='/var/www/ourjs' WEB_APP='svr/ourjs.js' #location of node you want to use NODE_EXE=/root/local/bin/node while true; do { $NODE_EXE $WEB_DIR/$WEB_APP config.magazine.js echo "Stopped unexpected, restarting " } 2>> $WEB_DIR/error.log sleep 1 done
错误日志记录也非常简单,直接将此进程控制台当中的错误输出到error.log文件即可: 2>> $WEB_DIR/error.log 这一行, 2 代表 Error。 |
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