Node js infinite loop | 易学教程

问题

I have a node server that pulls info from a php server and sends it over where it needs to be through a callback. Once or twice ad day the server gets stuck in an infinite loop and I think it's because I'm not properly handling the connection between the the php and node server. I posted my authentication code below. Anyone have any ideas?

exports.authenticate = function(request, callback) {
   var https = require('https');

   var options = {
            hostname: 'www.mysite.com',
            port: 443,
            path: '/site/chatauth?id=' + request.sessionID,
            method: 'GET',
    };
    var req = https.request(options, function(res) {
        //console.log("statusCode: ", res.statusCode);
        // console.log("headers: ", res.headers);

         res.on('data', function(d) {
         // process.stdout.write(d);
         });
        });

    req.end();
    req.on('response', function (response) {
            var data = '';
            response.setEncoding('utf8');
            response.on('data', function(chunk) {
                    data += chunk;
            });

           // console.log (request.sessionID);

            response.on('end', function() {
                    try {
                            callback(JSON.parse(data));
                    } catch(e) {
            callback(); 
                            console.log("authentication failed");
                    }
            });
    });

};

回答1:

are you sure authenticate function? Your code is seems to be perfect. There is two thing you have to do

1.Make callback on request error, request timeout and request abort.

2.Get deep insight about your callback, In following code you call same function on throwing exception. Are you sure about this?. This could make possibly loop, if it is again reach "authentication" function.

try {
    callback(JSON.parse(data));
} catch(e) {
    callback();
    console.log("authentication failed");
}

回答2:

I can't find any errors in your code, but due to emitter/asynchronous way perhaps I didn't catch it completely.

I personally use npm module request (Simplified HTTP request client) w/o any problems so far. You could easily give it a try:

var request = require('request');
request({
    uri: 'https://www.mysite.com/site/chatauth?id=' + request.sessionID,
    encoding: 'utf8',
    timeout: 20000,
    strictSSL: true
}, function (err, response, body) {
   if (err || response.statusCode !== 200) {
       // some error handling
       callback('error');
       return;
   }
   callback(null, JSON.parse(body));
});

来源：https://stackoverflow.com/questions/19739307/node-js-infinite-loop

标签

javascript

node.js

loops

infinite