forked from lsl/peerbind
/
peerbindserver.js
executable file
·716 lines (587 loc) · 18.8 KB
/
peerbindserver.js
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//
// Copyright 2011 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Amazon Software License (the "License"). You may
// not use this file except in compliance with the License. A copy of
// the License is located at
//
// http://aws.amazon.com/asl/
//
// or in the license file accompanying this file. This file is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
// OF ANY KIND, express or implied. See the License for the specific
// language governing permissions and limitations under the License.
//
var util = require("util");
var fs = require('fs');
var http = require('http');
var url = require('url');
var querystring = require('querystring');
var events = require('events');
var htmlFiles = [];
var blacklist = {};
var dir = process.argv[2];
if (!dir){
dir = ".";
}
if (!dir.match(/\/$/)){
dir = dir + '/';
}
//Map servable files..
fs.readdir(dir, function (err, files) {
if (err) return;
files.forEach(function (file) {
fs.stat(dir + file, function (err, stats) {
if (err) throw err;
if (stats.isFile()) {
console.log("%s is file", file);
fs.readFile(dir + file, function (err, data) {
if (err) throw err;
htmlFiles[file] = data;
});
} else if (stats.isDirectory()) {
console.log("%s is a directory", file);
}
console.log('stats: %s', JSON.stringify(stats));
});
});
});
function Instance(instance, queue, peersetPrefix) {
this.alive = true;
this.stats = instance;
this.dns = instance.dnsName;
this.privatedns = instance.privateDnsName;
this.queues = queue;
this.prefix = peersetPrefix
this.isRedirect = true;
this.accessTime = new Date().getTime();
}
Instance.prototype.isAlive = function (val) {
if (val !== undefined) this.alive = val;
return this.alive;
}
//Index to queues by index name
var queues = {};
var prefixIndex = {};
//The total collection of machines created.
var instances = [];
//The folks using a peersetPrefix that are waiting for a host.
var instanceWait = {};
//Machines that are ready to take the load if this one is overheated.
var instancePool = [];
//A queues
function Queue() {
this.id = "";
this.messages = [];
this.accessTime = new Date().getTime();
this.inPool = false;
this.poolId = -1;
events.EventEmitter.call(this);
this.setMaxListeners(0);
}
util.inherits(Queue, events.EventEmitter);
Queue.prototype.addMessage = function (msg) {
this.messages.push(msg);
this.emit("msgadded", this.id);
}
Queue.prototype.clearMessages = function () {
this.accessTime = new Date().getTime();
//Clear the messages Queue.
this.messages = [];
console.log("Messages cleared: \t" + this.id);
}
Queue.prototype.getMessages = function (callback) {
this.accessTime = new Date().getTime();
//Return a copy of the array.
var msgs = this.messages;
console.log("Messages checked: \t" + this.id + "\t ct: " + msgs.length);
callback(msgs);
//Clear the messages Queue.
this.messages = [];
}
function getPeerset(prefix, guid) {
return prefix + "-" + guid;
}
function getPeersetPrefix(type, urlString, data) {
var peerset = "nurffle";
switch (type) {
case "domain":
peerset = getPeersetDomain(urlString);
break;
case "page":
peerset = getPeersetPage(urlString);
break;
case "ip":
peerset = getPeersetIp(urlString, data /*the ip*/ );
break;
case "geo":
peerset = getPeersetGeo(urlString, data /*the lat/long*/ );
break;
case "string":
peerset = getPeersetString(urlString, data /*the string*/ );
break;
}
return peerset;
}
function getPeersetDomain(urlString) {
try {
var fullPath = url.parse(urlString).host;
fullPath = fullPath.replace(/[^a-z0-9A-Z]*/g, "");
return fullPath;
} catch (ex) {
console.log("Exception: ");
console.log(ex);
}
}
function getPeersetIp(urlString, ip) {
try {
var urlObj = url.parse(urlString);
var fullPath = urlObj.host + (urlObj.pathname ? urlObj.pathname : "") + "-" + ip;
fullPath = fullPath.replace(/[^a-z0-9A-Z]*/g, "");
return fullPath;
} catch (ex) {
console.log("Exception: ");
console.log(ex);
}
}
function getPeersetPage(urlString) {
try {
var urlObj = url.parse(urlString);
var fullPath = urlObj.host + (urlObj.pathname ? urlObj.pathname : "");
fullPath = fullPath.replace(/[^a-z0-9A-Z]*/g, "");
return fullPath;
} catch (ex) {
console.log("Exception: ");
console.log(ex);
}
}
function getPeersetGeo(urlString, latData) {
try {
var latNLong = latData.split(/,/);
var lat = Math.round(parseFloat(latNLong[0]) * 100);
var lng = Math.round(parseFloat(latNLong[1]) * 100);
var urlObj = url.parse(urlString);
var fullPath = urlObj.host + (urlObj.pathname ? urlObj.pathname : "") + "-" + lat + "-" + lng;
fullPath = fullPath.replace(/[^a-z0-9A-Z]*/g, "");
return fullPath;
} catch (ex) {
console.log("Exception: ");
console.log(ex);
}
}
function getPeersetString(url, strVal) {
try {
var fullPath = getPeersetPage(url);
return fullPath + "-" + strVal;
} catch (ex) {
console.log("Exception: ");
console.log(ex);
}
}
function takePeerset(req, res, reqObj) {
if (req.method == 'POST') {
console.log("Handling take queue with post.");
var body = '';
req.on('data', function (data) {
body += data;
});
req.on('end', function () {
//This is big data. Pull the peerset.
var reqObjPost = querystring.parse(body);
var peersetPrefix = reqObjPost.pp;
var qs = JSON.parse(reqObjPost.qs);
if (prefixIndex[peersetPrefix] == null) prefixIndex[peersetPrefix] = [];
for (var index in qs) {
var curq = qs[index];
var q = new Queue();
q.id = curq.id;
q.messages = curq.messages;
if (queues[q.id] == null) {
queues[q.id] = q;
} else {
queues[q.id].messages.concat(q.messages);
}
prefixIndex[peersetPrefix].push(queues[q.id]);
}
res.end("got it!");
});
}
}
function launchInstance(peersetPrefix, peerset, callback) {
try {} catch (ex) {
console.log("Ack! Failed to start host: ");
console.log(ex);
}
}
//This function will be called to remove the pointer to the other machine
//from our peerset index(so we don't direct customers there.
function removeInstance(peersetPrefix) {
instances[peersetPrefix].isAlive(false);
if (instancePool.length > 3) {
//Shut down this machine.
} else
//Other wise keep it for another overrun
instancePool[instancePool.length] = instances[peersetPrefix];
delete prefixIndex[peersetPrefix];
delete instances[peersetPrefix];
}
//When a new client comes in, we'll check to see if the host is around before
//assigning the host to the caller.
function checkInstanceHealth(peersetPrefix, peerset, callback) {
callback(peersetPrefix, peerset, instances[peersetPrefix].isAlive());
}
function transferMsgs(peersetPrefix, callback) {
//Send the messages as a post to the instance in the instance struct.
console.log("Starting msg transfer to : " + peersetPrefix + " on: " + prefixIndex[peersetPrefix].privatedns);
var options = {
host: prefixIndex[peersetPrefix].dns,
port: 80,
path: '/takequeue/',
method: 'POST'
};
console.log("Starting msg transfer to : " + peersetPrefix + " on: " + options.host);
try {
console.log("Starting request setup.");
var request = http.request(options, function (res, error) {
res.setEncoding('utf8');
console.log('STATUS: ' + res.statusCode);
res.on('data', function (chunk) {
console.log("DATA: " + chunk);
});
callback();
});
request.on('error', function (e) {
setTimeout((function (peersetPrefix, callback) {
return (function () {
transferMsgs(peersetPrefix, callback);
});
})(peersetPrefix, callback), 5000);
return;
});
var data = "pp=" + peersetPrefix + "&qs=" + JSON.stringify(prefixIndex[peersetPrefix].queues);
console.log("Writting data:" + data);
request.write(data);
console.log("Signaling go!");
request.end();
} catch (ex) {
console.log("Exception trying to sync messages.");
console.log(request);
console.log(ex);
}
}
function handOffPeerset(peersetPrefix, peerset, res, callback) {
//Setup waiting queue
if (!instanceWait[peerset]) {
instanceWait[peerset] = [];
//The response object waiting on this response.
instanceWait[peerset].push(callback);
//Start instance
//Serilialize set
//Set DNS entry
//Force client registration
//Record host for peerset.
//Drain waiting queue
launchInstance(peersetPrefix, peerset, (function (callback, peersetPrefix, peerset) {
return (function () {
transferMsgs(peersetPrefix, function () {
console.log("Done transferring msgs to secondary host.");
for (
var i = 0; i < instanceWait[peerset].length; i++) {
instanceWait[peerset][i]();
}
delete instanceWait.peerset;
console.log(prefixIndex);
});
});
})(callback, peersetPrefix, peerset));
} else {
//The response object waiting on this response.
instanceWait[peerset].push(callback);
}
}
function redirectToMachine(prefix, peerset, req, res, reqObj, dontClose) {
try {
prefixIndex[prefix].accessTime = new Date().getTime();
console.log("Writting out redirection code.");
res.write("$.fn.peerbind.defaults.endpoint='" + prefixIndex[prefix].dns + "';\n");
res.write("$.fn.peerbind.defaults.endpointprefixes=[];\n");
} catch (ex) {
console.log(ex);
}
}
function canHandleNewPrefix() {
return true;
}
function handleRegistration(req, res, reqObj, dontClose) {
try {
var referer = req.headers.referer;
if (reqObj.query.u) referer = reqObj.query.u;
if (!referer || referer == undefined) {
res.end("No referer.");
return;
}
var callback = reqObj.query.f;
var guid = reqObj.query.g;
var type = reqObj.query.t;
var data = reqObj.query.d;
var peersetPrefix = getPeersetPrefix(type, referer, data);
var peerset = getPeerset(peersetPrefix, guid);
if (queues[peerset] == null && (prefixIndex[peersetPrefix] == null || prefixIndex[peersetPrefix]["isRedirect"] == null)) {
queues[peerset] = new Queue();
queues[peerset].id = peerset;
if (prefixIndex[peersetPrefix] == null) prefixIndex[peersetPrefix] = [];
var indexArray = prefixIndex[peersetPrefix];
indexArray[indexArray.length] = queues[peerset];
if (!canHandleNewPrefix()) {
console.log("Handing off peersetPrefix:" + peersetPrefix);
handOffPeerset(peersetPrefix, peerset, res, (function (peersetPrefix, peerset, req, res, reqObj, dontClose) {
return (function () {
console.log("Done handing off peersetPrefix:" + peersetPrefix);
redirectToMachine(peersetPrefix, peerset, req, res, reqObj, dontClose);
res.write(callback + "('[" + guid + "]','" + peersetPrefix + "','" + peerset + "');");
res.end();
console.log("Callback sent.");
});
})(peersetPrefix, peerset, req, res, reqObj, dontClose));
return;
}
} else if (prefixIndex[peersetPrefix] != null && prefixIndex[peersetPrefix]["isRedirect"]) {
redirectToMachine(peersetPrefix, peerset, req, res, reqObj, dontClose);
} else queues[peerset].clearMessages(); //clears the queue and resets access time.
if (!dontClose)
res.end(callback + "('[" + guid + "]','" + peersetPrefix + "','" + peerset + "');");
} catch (ex) {
console.log("Exception: ");
console.log(ex);
}
}
/*
* todo
*/
function handleDeregistration(req, res, reqObj, dontClose) {
}
function cleanInput(data) {
if (data) data = data.replace(/\<|\>|\(|\)/g, "").replace(/"/g, '\\"').replace(/'/g, "\\'");
return data;
}
function handlePost(req, res, reqObj) {
try {
var referer = req.headers.referer;
if (reqObj.query.u) referer = reqObj.query.u;
var callback = cleanInput(reqObj.query.f);
var guid = cleanInput(reqObj.query.g);
var type = cleanInput(reqObj.query.t);
var eventObj = JSON.parse(reqObj.query.e);
eventObj.s = eventObj.s.replace(/<|>/g, "");
eventObj.t = cleanInput(eventObj.t);
eventObj = JSON.stringify(eventObj);
var data = cleanInput(reqObj.query.d);
var target = cleanInput(reqObj.query.q);
console.log("Guid adding: " + guid);
if (blacklist[guid]) {
console.log("Guid blocked: " + guid);
return;
}
var peersetPrefix = getPeersetPrefix(type, referer, data);
var peerset = getPeerset(peersetPrefix, guid);
//This is not a targeted event.
if (!target) {
for (var q in prefixIndex[peersetPrefix]) {
var curQ = prefixIndex[peersetPrefix][q];
if (curQ && curQ.id != peerset) {
curQ.addMessage(eventObj);
}
}
}
//Targeted event. They have someone in mind.
else {
var targetPeerset = getPeerset(peersetPrefix, target);
if (queues[targetPeerset]) queues[targetPeerset].addMessage(eventObj);
}
//$.fn.peerbind.peerbindPost1([{"src":"3154510-6734933-7399065","s":"body:eq(0)","t":"arrived","d":"","o":"1297363099141"}],0);
res.end(callback + '([' + eventObj + '],0);');
} catch (ex) {
console.log("Exception: ");
console.log(ex);
try {
res.end();
} catch (e) {}
}
}
function respondWithMsgs(peerset, res, callback) {
var responded = false;
try {
if (!queues[peerset]) {
res.end("No queue.Re-register.");
return;
}
queues[peerset].getMessages(function (msgs) {
//jQuery.fn.peerbind.peerbindTrigger([{"src":"5824815-4029276-6442589","s":"#chatinput","t":"change","d":"f","o":"1297367135634"},{"src":"5824815-4029276-6442589","s":"#chatinput","t":"change","d":"f","o":"1297367134237"},{"src":"5824815-4029276-6442589","s":"#chatinput","t":"change","d":"f","o":"1297367134373"}],0);jQuery.fn.peerbind.peerbindTrigger([],0);
if (msgs.length) {
res.end(callback + '([' + msgs.join(",") + '],0);');
//No reason to let these fire.
clearTimeout(res.connTimer);
responded = true;
} else {
//console.log("Nothing to send:" + peerset);
}
});
} catch (ex) {
console.log("EXCEPTION: %s", ex);
}
return responded;
}
function handlePoll(req, res, reqObj) {
try {
var referer = req.headers.referer;
if (reqObj.query.u) referer = reqObj.query.u;
var callback = reqObj.query.f;
var guid = reqObj.query.g;
var type = reqObj.query.t;
var data = reqObj.query.d;
var peersetPrefix = getPeersetPrefix(type, referer, data);
var peerset = getPeerset(peersetPrefix, guid);
var myQ = queues[peerset];
if (myQ == null) {
//Whoops.. Someone is polling on a queue that does'nt live.
handleRegistration(req, res, reqObj, true /*means it shouldn't respond.*/ );
}
conditionResponseObject(res, peerset, callback);
} catch (ex) {
console.log("Exception polling: " + util.inspect(ex));
}
}
function conditionResponseObject(res, peerset, callback) {
try {
var meTimestamp = new Date().getTime();
res.scopedResponse = function (peerset) {
if (respondWithMsgs(peerset, res, callback)) {
//console.log("Removed responder: " + peerset);
queues[peerset].removeListener("msgadded", res.scopedResponse);
} else {
//console.log("No messages sent: " +peerset);
}
}
res.scopedListener = function (time) {
if (meTimestamp < time) {
//console.log("Removed listener - ended call.");
queues[peerset].removeListener("msgadded", res.scopedResponse);
res.end(callback + '([],0);');
}
}
//console.log("\nPolling for:" + peerset);
if (queues[peerset]) {
queues[peerset].on("msgadded", res.scopedResponse);
//Call it once to see if there are
//any messages already waiting.
res.scopedResponse(peerset);
} else {
res.end();
return;
}
//After 30 seconds, close the connection.
res.connTimer = setTimeout((function (res, peerset) {
return (function () {
queues[peerset].removeListener("msgadded", res.scopedResponse);
res.end(callback + '([],0);');
});
})(res, peerset), 30000);
} catch (ex) {
console.log("Exception condtioning response: " + util.inspect(ex));
}
}
//If the queues are older than a day, get rid of them.
function cleanQueues() {
for (var q in queues) {
if (queues[q]) {
var time = queues[q].accessTime;
//Check to see if the age is greater than a 90 seconds
if ((new Date().getTime()) - time > (90000 * 1)) {
console.log("Removing q: " + q);
delete queues[q];
}
}
}
}
function cleanInstances() {
for (var instance in instances) {
if (instances[instance]) {
var time = instances[instance].accessTime;
//Check to see if the age is greater than a day
if ((new Date().getTime()) - time > (86400 * 1)) {
console.log("Removing instance: " + instance);
removeInstance(instance);
}
}
}
}
//Clean the queues every 30 seconds;
setInterval(cleanQueues, 1000 * 30);
//Clean up instances every 1 hour.
setInterval(cleanInstances, 1000 * 60 * 60);
function requestHandler(req, res) {
try {
res.writeHead(200, {
'Content-Type': 'text/javascript'
});
var reqObj = url.parse(req.url, true);
var fileName = reqObj.pathname;
if (fileName) fileName = fileName.replace(/\//, "").replace(/\/.*/, "");
if (!fileName || fileName == "") fileName = "index.html";
//var headerObj = req.headers; //what is this for???
var path = reqObj.pathname;
if (path == "/register/") handleRegistration(req, res, reqObj, false);
else if (path == "/deregister/") handleDeregistration(req, res, reqObj, false);
else if (path == "/post/") handlePost(req, res, reqObj);
else if (path == "/poll/") {
handlePoll(req, res, reqObj);
} else if (path == "/takequeue/") {
console.log("Handling take queue.");
takePeerset(req, res, reqObj);
} else {
if (htmlFiles[fileName]) {
if (res.socket && res.socket.writable) {
if (fileName.match(/\.js$/)) res.writeHead(200, {
'Content-Type': 'text/javascript'
});
if (fileName.match(/\.ico$/)) res.writeHead(200, {
'Content-Type': 'image/png'
});
else res.writeHead(200, {
'Content-Type': 'text/html'
});
res.end(htmlFiles[fileName]);
}
} else {
if (res.socket && res.socket.writable) {
res.writeHead(200, {
'Content-Type': 'text/plain'
});
res.end('(function() { console.log("oops: ' + fileName + '");})()');
}
}
}
} catch (ex) {
console.log("Exception: ");
console.log(ex);
}
}
//Boot the server on a few ports..
try {
http.createServer(requestHandler).listen(7337);
} catch (e){
console.log("Exception: ");
console.log(e);
}
try {
http.createServer(requestHandler).listen(8080);
} catch (e){
console.log("Exception: ");
console.log(e);
}
try {
http.createServer(requestHandler).listen(80);
} catch (e){
console.log("Exception: ");
console.log(e);
}