在Express 3中,当进程存在时,如何处理关闭数据库连接?
除非您明确使用HTTP服务器的.on('close', ...
调用,否则不会发出.close()
事件。
到目前为止,这是我最接近的,但它使用process.on
代替server.on
:
process.on('SIGTERM', function () {
// Close connections.
process.exit(0);
});
答案 0 :(得分:10)
基于以下信息:
-
var express = require('express');
var app = express();
var server = app.listen(1337);
var shutting_down = false;
app.use(function (req, resp, next) {
if(!shutting_down)
return next();
resp.setHeader('Connection', "close");
resp.send(503, "Server is in the process of restarting");
// Change the response to something your client is expecting:
// html, text, json, etc.
});
function cleanup () {
shutting_down = true;
server.close( function () {
console.log( "Closed out remaining connections.");
// Close db connections, other chores, etc.
process.exit();
});
setTimeout( function () {
console.error("Could not close connections in time, forcing shut down");
process.exit(1);
}, 30*1000);
}
process.on('SIGINT', cleanup);
process.on('SIGTERM', cleanup);
Connection: close
标头用于告知任何keep-alive
连接在下次发送HTTP请求时关闭。更多信息:http://www.jmarshall.com/easy/http/#http1.1s4
我不知道是否有其他方法可以关闭keep-alive
连接。除非关闭keep-alive
连接,否则节点进程将挂起。默认空闲超时为2分钟。更多信息。在node.js keep-alive
超时(包括更改超时):How to set the HTTP Keep-Alive timeout in a nodejs server