我對NodeJS
和Websockets
很新,但我正在嘗試使用它。node.js websocket在客戶端斷開連接時崩潰
我所做的是從串口讀取傳入數據,然後使用websocket將這些數據發送到網頁。 從這裏一切正常。
- 我用node-static爲我的網頁
- 我用ws對於WebSocket的
問題是,當一個客戶關閉了瀏覽器,那麼我的NodeJS的WebSocket服務器崩潰,出現以下錯誤:
[email protected]:~/app# node socketserver.js
open serial communication
Client disconnected.
/root/node-v0.10.29/lib/node_modules/ws/lib/WebSocket.js:187
else throw new Error('not opened');
^
Error: not opened
at WebSocket.send (/root/node-v0.10.29/lib/node_modules/ws/lib/WebSocket.js:187:16)
at sendAll (/root/app/socketserver.js:30:16)
at SerialPort.<anonymous> (/root/app/socketserver.js:58:8)
at SerialPort.emit (events.js:95:17)
at Object.module.exports.raw [as parser] (/root/node-v0.10.29/bin/node_modules/serialport/parsers.js:8:13)
at Object.SerialPort.options.dataCallback (/root/node-v0.10.29/bin/node_modules/serialport/serialport.js:143:15)
at SerialPortFactory.SerialPort._emitData (/root/node-v0.10.29/bin/node_modules/serialport/serialport.js:312:20)
at afterRead (/root/node-v0.10.29/bin/node_modules/serialport/serialport.js:290:18)
at /root/node-v0.10.29/bin/node_modules/serialport/serialport.js:304:9
at Object.wrapper [as oncomplete] (fs.js:459:17)
這裏是我的WebSocket /代碼的serialport:
var WebSocketServer = require('../node-v0.10.29/lib/node_modules/ws').Server;
var SerialPort = require('../node-v0.10.29/bin/node_modules/serialport').SerialPort;
var serialPort;
var portName = '/dev/ttyACM0';
var sendData = "";
var wss = new WebSocketServer({port: 8080});
var CLIENTS=[];
wss.on('connection', function(ws) {
CLIENTS.push(ws);
ws.on('message', function(message) {
console.log('received: %s', message);
sendAll(message);
});
ws.on('close', function() {
console.log('Client disconnected.');
});
ws.on('error', function() {
console.log('ERROR');
});
ws.send("");
});
function sendAll(message)
{
for(var i=0;i<CLIENTS.length;i++)
{
CLIENTS[i].send(message);
}
}
serialListener();
function serialListener(debug)
{
var receivedData = "";
serialPort = new SerialPort(portName, {
baudrate: 9600,
dataBits: 8,
parity: 'none',
stopBits: 1,
flowControl: false
});
serialPort.on("open", function() {
console.log('open serial communication');
// Listens to incoming data
serialPort.on('data', function(data) {
receivedData += data.toString();
if (receivedData .indexOf('E') >= 0 && receivedData .indexOf('B') >= 0) {
sendData = receivedData .substring(receivedData .indexOf('B') + 1, receivedData .indexOf('E'));
receivedData = '';
}
// send the incoming data to browser with websockets.
sendAll(sendData);
});
});
}
有人能幫我弄清楚這裏有什麼問題嗎?
看來你是正確的,因爲如果我的init回'close'事件我的數組不會再崩潰。但是,從現在開始,我正在尋找一種方法來識別斷開連接的客戶端以將其從陣列中移除 – user2196728
也許'CLIENTS.splice(CLIENTS.indexOf(ws),1)'? – rkusa
太棒了,作品!將進一步調查(我正在學習...)。謝謝 – user2196728