[英]Socket.io Chat application Shows EventEmitter memory leak detected. 11 listeners added. Use emitter.setMaxListeners()
[英]EventEmitter memory leak from function within socket.io handler
我有一台需要動態值的服務器,該值不斷從生成的進程中更新。 我試圖在服務器范圍之外創建自定義偵聽器,因為我收到了潛在的內存泄漏錯誤,但是在服務器上發生幾次連接/斷開連接后,我仍然收到這些消息。 為什么在斷開事件偵聽器期間未刪除初始連接之后添加的偵聽器?
var express = require('express');
var http = require('http');
var spawn = require('child_process').spawn;
var util = require('util');
var fs = require('fs');
var EventEmitter = require('events').EventEmitter;
var sys = require('sys');
var app = express(),
server = http.createServer(app),
io = require('socket.io').listen(server);
function Looper(req) {
this.req = req;
EventEmitter.call(this);
}
sys.inherits(Looper, EventEmitter);
Looper.prototype.run = function() {
var self = this;
var cmd = spawn('./flow',[this.req]); // <-- script that outputs req every second
cmd.stdout.setEncoding('utf8');
cmd.stdout.on('data', function(data) {
self.emit('output',data);
});
}
Looper.prototype.output = function(callback) {
this.on('output', function(data) {
return callback(data.trim());
});
}
var looper = new Looper('blah');
looper.run();
app.use(express.static(__dirname + '/public'));
app.get('/', function(req, res) {
res.send(
"<script src='/socket.io/socket.io.js'></script>\n"+
"<script>\n"+
"\tvar socket=io.connect('http://127.0.0.1:3000');\n"+
"\tsocket.on('stream', function(data) {\n"+
"\t\tconsole.log(data);\n"+
"\t});\n"+
"</script>\n"
);
});
server.listen(3000);
io.sockets.on('connection', function(webSocket) {
looper.output(function(res) {
webSocket.emit('stream',res);
});
webSocket.on('disconnect', function() {
looper.removeListener('output',looper.output); // <- not remove listener added when connection was made
});
});
每次將looper.output調用到事件“輸出”時,都會添加一個額外的回調函數。 我不知道您要實現什么,但僅使用一次即可使用this.once('output', ...)
進行此調用this.once('output', ...)
或將回調設置移至該對象或先刪除舊函數...
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