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stream.js
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stream.js
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/*
* Copyright (c) 2011 Eran Hammer-Lahav. All rights reserved. Copyrights licensed under the New BSD License.
* See LICENSE file included with this code project for license terms.
*/
// Load modules
var Hapi = require('hapi');
var SocketIO = require('socket.io');
var Project = require('./project');
var Session = require('./session');
// Declare internals
var internals = {
// Updates queue
updatesQueue: [],
// Sockets list
socketsById: {}, // { _id_: { socket: _socket_, userId: _userId_ }, ... }
idsByProject: {}, // { _projectId_: { _id_: true, ... }, ... }
idsByUserId: {}, // { _userId_: { _id_: true, ... }, ... }
projectsById: {} // { _id_: { _projectId_: true, ... }, ... }
};
// Initialize
exports.initialize = function (server) {
internals.io = SocketIO.listen(server, { log: Hapi.Log.info });
internals.io.sockets.on('connection', internals.connection);
setInterval(internals.processUpdates, 1000);
};
// Add update to queue
exports.update = function (update, request) {
update.type = 'update';
if (request) {
if (request.userId) {
update.by = request.userId;
}
if (request.session &&
request.session.id) {
update.macId = request.session.id.slice(0, 8);
}
}
internals.updatesQueue.push(update);
};
// Subscribe
exports.subscribe = function (request) {
// Lookup socket
if (internals.socketsById[request.params.id] &&
internals.socketsById[request.params.id].socket) {
if (internals.socketsById[request.params.id].userId) {
if (internals.socketsById[request.params.id].userId === request.userId) {
var socket = internals.socketsById[request.params.id].socket;
// Lookup project
Project.load(request.params.project, request.userId, false, function (project, member, err) {
if (err === null) {
// Add to subscriber list
internals.idsByProject[project._id] = internals.idsByProject[project._id] || {};
internals.idsByProject[project._id][request.params.id] = true;
// Add to cleanup list
internals.projectsById[request.params.id] = internals.projectsById[request.params.id] || {};
internals.projectsById[request.params.id][project._id] = true;
// Send ack via the stream
socket.json.send({ type: 'subscribe', project: project._id });
// Send ack via the request
request.reply({ status: 'ok' });
}
else {
request.reply(err);
}
});
}
else {
request.reply(Hapi.Error.forbidden());
}
}
else {
request.reply(Hapi.Error.badRequest('Stream not initialized'));
}
}
else {
request.reply(Hapi.Error.notFound('Stream not found'));
}
};
// Unsubscribe
exports.unsubscribe = function (request) {
// Lookup socket
if (internals.socketsById[request.params.id] &&
internals.socketsById[request.params.id].socket) {
if (internals.socketsById[request.params.id].userId) {
if (internals.socketsById[request.params.id].userId === request.userId) {
var socket = internals.socketsById[request.params.id].socket;
// Remove from subscriber list
if (internals.idsByProject[request.params.project] &&
internals.idsByProject[request.params.project][request.params.id]) {
delete internals.idsByProject[request.params.project][request.params.id];
// Remove from cleanup list
if (internals.projectsById[request.params.id]) {
delete internals.projectsById[request.params.id][request.params.project];
}
// Send ack via the stream
socket.json.send({ type: 'unsubscribe', project: request.params.project });
// Send ack via the request
request.reply({ status: 'ok' });
}
else {
request.reply(Hapi.Error.notFound('Project subscription not found'));
}
}
else {
request.reply(Hapi.Error.forbidden());
}
}
else {
request.reply(Hapi.Error.badRequest('Stream not initialized'));
}
}
else {
request.reply(Hapi.Error.notFound('Stream not found'));
}
};
// Force unsubscribe
exports.drop = function (userId, projectId) {
var userIds = internals.idsByUserId[userId];
if (userIds) {
var projectIds = internals.idsByProject[projectId];
if (projectIds) {
for (var i in userIds) {
if (userIds.hasOwnProperty(i)) {
if (projectIds[i]) {
delete internals.idsByProject[projectId][i];
// Send ack via the stream
if (internals.socketsById[i] &&
internals.socketsById[i].socket) {
internals.socketsById[i].socket.json.send({ type: 'unsubscribe', project: projectId });
}
}
}
}
}
}
};
// New Socket
internals.connection = function (socket) {
// Add to sockets map
internals.socketsById[socket.id] = { socket: socket };
// Setup handlers
socket.on('message', internals.messageHandler(socket));
socket.on('disconnect', internals.disconnectHandler(socket));
// Send session id
socket.json.send({ type: 'connect', session: socket.id });
};
// Stream message handler
internals.messageHandler = function (socket) {
return function (message) {
if (internals.socketsById[socket.id]) {
if (message) {
switch (message.type) {
case 'initialize':
Session.validate(socket.id, message.id, message.mac, function (userId, err) {
if (userId) {
internals.socketsById[socket.id].userId = userId;
internals.idsByUserId[userId] = internals.idsByUserId[userId] || {};
internals.idsByUserId[userId][socket.id] = true;
socket.json.send({ type: 'initialize', status: 'ok', user: userId });
Hapi.Log.info('Stream ' + socket.id + ' initialized with userId ' + userId);
}
else {
socket.json.send({ type: 'initialize', status: 'error', error: err });
Hapi.Log.err(err);
}
});
break;
default:
socket.json.send({ type: 'error', error: 'Unknown message type: ' + message.type });
break;
}
}
}
else {
Hapi.Log.err('Message received after disconnect from socket: ' + socket.id + ', message: ' + JSON.stringify(message));
}
};
}
// Stream disconnection handler
internals.disconnectHandler = function (socket) {
return function () {
if (internals.socketsById[socket.id]) {
var userId = internals.socketsById[socket.id].userId;
// Remove from users list
if (userId) {
delete internals.idsByUserId[userId];
}
// Remove from sockets list
delete internals.socketsById[socket.id];
}
// Remove from subscribers list
var projects = internals.projectsById[socket.id];
if (projects) {
for (var i in projects) {
if (projects.hasOwnProperty(i)) {
if (internals.idsByProject[i]) {
delete internals.idsByProject[i][socket.id];
}
}
}
}
// Remove from cleanup list
delete internals.projectsById[socket.id];
};
}
// Updates interval
internals.processUpdates = function () {
for (var i = 0, il = internals.updatesQueue.length; i < il; ++i) {
var update = internals.updatesQueue[i];
var updatedIds = '';
switch (update.object) {
case 'project':
case 'tasks':
case 'task':
case 'details':
// Lookup project list
var ids = internals.idsByProject[update.project];
if (ids) {
for (var s in ids) {
if (ids.hasOwnProperty(s)) {
if (internals.socketsById[s] &&
internals.socketsById[s].socket) {
internals.socketsById[s].socket.json.send(update);
updatedIds += ' ' + s;
}
}
}
}
break;
case 'profile':
case 'contacts':
case 'projects':
var ids = internals.idsByUserId[update.user];
if (ids) {
for (var s in ids) {
if (ids.hasOwnProperty(s)) {
if (internals.socketsById[s] &&
internals.socketsById[s].socket) {
internals.socketsById[s].socket.json.send(update);
updatedIds += ' ' + s;
}
}
}
}
break;
}
if (updatedIds) {
Hapi.Log.info('Stream update: ' + update.object + ':' + (update.user || update.project) + ' sent to' + updatedIds);
}
}
internals.updatesQueue = [];
};