从零开始学习Node.js例子五 服务器监听

httpsnifferInvoke.js

var http = require('http');
var sniffer = require('./httpsniffer');

var server = http.createServer(function(req, res){
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end('Hello, World!\n');
});

sniffer.sniffOn(server);
server.listen(3000);

httpsniffer.js

//http sniffer 监听每个服务器事件，然后输出每个事件的相关信息
var url = require('url');
var util = require('util');

exports.sniffOn = function(server){
    server.on('request', function(req, res){
        util.log('e_request');
        util.log(reqToString(req));
    });

    server.on('close', function(error){
        util.log('e_close error=' + error);
    });

    server.on('checkContinue', function(req, res){
        util.log('e_checkContinue');
        util.log(reqToString(req));
        res.writeContinue();
    });

    server.on('upgrade', function(req, socket, head){
        util.log('e_upgrade');
        util.log(reqToString(req));
    });

    server.on('clientError', function(){
        util.log('e_clientError');
    });
}

var reqToString = function(req){
    var ret = 'request' + req.method + ' ' + req.httpVersion + ' ' + req.url + '\n';
    ret += JSON.stringify(url.parse(req.url, true)) + '\n';
    var keys = Object.keys(req.headers);
    for (var i = 0; i < keys.length; i++){
        var key = keys[i];
        ret += i + ' ' + key + ': ' + req.headers[key] + '\n';
    }
    if (req.trailers) ret += req.trailers + '\n';
    return ret;
}

exports.reqToString = reqToString;