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TA贡献1784条经验 获得超2个赞
最新情况:
process.on('exit')
SIGINT
process.exit()
process.stdin.resume();//so the program will not close instantlyfunction exitHandler(options, exitCode) { if (options.cleanup) console.log('clean'); if (exitCode || exitCode === 0) console.log(exitCode); if (options.exit) process.exit();}//do something when app is closingprocess.on('exit', exitHandler.bind(null,{cleanup:true})); //catches ctrl+c eventprocess.on('SIGINT', exitHandler.bind(null, {exit:true})); // catches "kill pid" (for example: nodemon restart)process.on('SIGUSR1', exitHandler.bind(null, {exit:true})); process.on('SIGUSR2', exitHandler.bind(null, {exit:true})); //catches uncaught exceptionsprocess.on('uncaughtException', exitHandler.bind(null, {exit:true}));
TA贡献1828条经验 获得超13个赞
下面的脚本允许对所有退出条件都有一个处理程序。它使用一个特定于应用程序的回调函数来执行自定义清理代码。
Clearup.js
// Object to capture process exits and call app specific cleanup function
function noOp() {};
exports.Cleanup = function Cleanup(callback) {
// attach user callback to the process event emitter
// if no callback, it will still exit gracefully on Ctrl-C
callback = callback || noOp;
process.on('cleanup',callback);
// do app specific cleaning before exiting
process.on('exit', function () {
process.emit('cleanup');
});
// catch ctrl+c event and exit normally
process.on('SIGINT', function () {
console.log('Ctrl-C...');
process.exit(2);
});
//catch uncaught exceptions, trace, then exit normally
process.on('uncaughtException', function(e) {
console.log('Uncaught Exception...');
console.log(e.stack);
process.exit(99);
});
};
这段代码截取了未识别的异常、Ctrl-C和正常的退出事件。然后,它在退出之前调用一个可选的用户清理回调函数,用一个对象处理所有退出条件。
该模块只是扩展Process对象,而不是定义另一个事件发射器。如果没有应用程序特定的回调,清理默认为无OP函数。当Ctrl-C退出时,子进程仍在运行,这对我的使用来说已经足够了。
您可以根据需要轻松添加其他退出事件,如SIGHUP。注意:根据NodeJS手册,SIGKILL不能有侦听器。下面的测试代码演示了使用Clearup.js的各种方法
// test cleanup.js on version 0.10.21
// loads module and registers app specific cleanup callback...
var cleanup = require('./cleanup').Cleanup(myCleanup);
//var cleanup = require('./cleanup').Cleanup(); // will call noOp
// defines app specific callback...
function myCleanup() {
console.log('App specific cleanup code...');
};
// All of the following code is only needed for test demo
// Prevents the program from closing instantly
process.stdin.resume();
// Emits an uncaught exception when called because module does not exist
function error() {
console.log('error');
var x = require('');
};
// Try each of the following one at a time:
// Uncomment the next line to test exiting on an uncaught exception
//setTimeout(error,2000);
// Uncomment the next line to test exiting normally
//setTimeout(function(){process.exit(3)}, 2000);
// Type Ctrl-C to test forced exit
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