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server.js
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server.js
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var args = JSON.parse(process.argv[2]);
var PORT;
if (args.port) {
PORT = parseInt(args.port);
}
var ID = args.id;
var INSTANCE_ID = args.instanceId;
var SOCKET_PATH = args.socketPath;
var SECRET_KEY = args.secretKey;
var EXPIRY_ACCURACY = args.expiryAccuracy || 1000;
var BROKER_CONTROLLER_PATH = args.brokerControllerPath;
var INIT_CONTROLLER_PATH = args.initControllerPath || null;
var DOWNGRADE_TO_USER = args.downgradeToUser;
var PROCESS_TERM_TIMEOUT = args.processTermTimeout || 10000;
var BROKER_OPTIONS = args.brokerOptions;
var INIT_CONTROLLER = null;
var BROKER_CONTROLLER = null;
var EventEmitter = require('events').EventEmitter;
var fs = require('fs');
var domain = require('domain');
var com = require('ncom');
var ExpiryManager = require('expirymanager').ExpiryManager;
var FlexiMap = require('fleximap').FlexiMap;
var initialized = {};
var errorHandler = function (err) {
var error;
if (err.stack) {
error = {
message: err.message,
stack: err.stack
};
} else {
error = err;
}
process.send({event: 'error', data: error});
};
var errorDomain = domain.create();
errorDomain.on('error', errorHandler);
if (DOWNGRADE_TO_USER && process.setuid) {
try {
process.setuid(DOWNGRADE_TO_USER);
} catch (err) {
errorDomain.emit('error', new Error('Could not downgrade to user "' + DOWNGRADE_TO_USER +
'" - Either this user does not exist or the current process does not have the permission' +
' to switch to it.'));
}
}
var escapeStr = '\\u001b';
var escapeArr = escapeStr.split('');
var send = function (socket, object) {
socket.write(object);
};
var dataMap = new FlexiMap();
var channelMap = new FlexiMap();
var dataExpirer = new ExpiryManager();
var addListener = function (socket, channel) {
channelMap.set(['sockets', socket.id].concat(channel), socket);
};
var hasListener = function (socket, channel) {
return channelMap.hasKey(['sockets', socket.id].concat(channel));
};
var anyHasListener = function (channel) {
var sockets = channelMap.get('sockets');
for (var i in sockets) {
if (sockets.hasOwnProperty(i)) {
if (channelMap.hasKey(['sockets', i].concat(channel))) {
return true;
}
}
}
return false;
};
var removeListener = function (socket, channel) {
channelMap.remove(['sockets', socket.id].concat(channel));
};
var removeAllListeners = function (socket) {
var subMap = channelMap.remove(['sockets', socket.id]);
var channels = [];
for (var i in subMap) {
if (subMap.hasOwnProperty(i)) {
channels.push(i);
}
}
return channels;
};
var getListeners = function (socket) {
return channelMap.get(['sockets', socket.id]);
};
var run = function (query, baseKey) {
var rebasedDataMap;
if (baseKey) {
rebasedDataMap = dataMap.getRaw(baseKey);
} else {
rebasedDataMap = dataMap;
}
return Function('"use strict"; return (' + query + ')(arguments[0], arguments[1], arguments[2]);')(rebasedDataMap, dataExpirer, channelMap);
};
var Broker = function () {
EventEmitter.call(this);
this.id = ID;
this.instanceId = INSTANCE_ID;
this.secretKey = SECRET_KEY;
this.type = 'broker';
this.options = BROKER_OPTIONS;
this.dataMap = dataMap;
this.dataExpirer = dataExpirer;
this.channelMap = channelMap;
};
Broker.prototype = Object.create(EventEmitter.prototype);
Broker.prototype.sendToMaster = function (data) {
process.send({
event: 'brokerMessage',
brokerId: this.id,
data: data
});
};
Broker.prototype.run = function (query, baseKey) {
return run(query, baseKey);
};
Broker.prototype.publish = function (channel, message) {
var sockets = channelMap.get('sockets');
var sock, channelKey;
for (var i in sockets) {
if (sockets.hasOwnProperty(i)) {
channelKey = ['sockets', i].concat(channel);
if (channelMap.hasKey(channelKey)) {
sock = channelMap.get(channelKey);
if (sock instanceof com.ComSocket) {
send(sock, {type: 'message', channel: channel, value: message});
}
}
}
}
};
var nDataBroker = new Broker();
errorDomain.add(nDataBroker);
global.broker = nDataBroker;
// Create the controller instances now.
// This is more symmetric to SocketCluster's worker cluster.
if (INIT_CONTROLLER_PATH != null) {
INIT_CONTROLLER = require(INIT_CONTROLLER_PATH);
errorDomain.run(function () {
INIT_CONTROLLER.run(nDataBroker);
});
}
if (BROKER_CONTROLLER_PATH != null) {
BROKER_CONTROLLER = require(BROKER_CONTROLLER_PATH);
errorDomain.run(function () {
BROKER_CONTROLLER.run(nDataBroker);
});
}
var actions = {
init: function (command, socket) {
var result = {id: command.id, type: 'response', action: 'init'};
if (command.secretKey == SECRET_KEY || !SECRET_KEY) {
initialized[socket.id] = {};
} else {
result.error = 'nData Error - Invalid password was supplied to nData';
}
send(socket, result);
},
set: function (command, socket) {
var result = nDataBroker.dataMap.set(command.key, command.value);
var response = {id: command.id, type: 'response', action: 'set'};
if (command.getValue) {
response.value = result;
}
send(socket, response);
},
expire: function (command, socket) {
nDataBroker.dataExpirer.expire(command.keys, command.value);
var response = {id: command.id, type: 'response', action: 'expire'};
send(socket, response);
},
unexpire: function (command, socket) {
nDataBroker.dataExpirer.unexpire(command.keys);
var response = {id: command.id, type: 'response', action: 'unexpire'};
send(socket, response);
},
getExpiry: function (command, socket) {
var response = {id: command.id, type: 'response', action: 'getExpiry', value: nDataBroker.dataExpirer.getExpiry(command.key)};
send(socket, response);
},
get: function (command, socket) {
var result = nDataBroker.dataMap.get(command.key);
send(socket, {id: command.id, type: 'response', action: 'get', value: result});
},
getRange: function (command, socket) {
var result = nDataBroker.dataMap.getRange(command.key, command.fromIndex, command.toIndex);
send(socket, {id: command.id, type: 'response', action: 'getRange', value: result});
},
getAll: function (command, socket) {
send(socket, {id: command.id, type: 'response', action: 'getAll', value: nDataBroker.dataMap.getAll()});
},
count: function (command, socket) {
var result = nDataBroker.dataMap.count(command.key);
send(socket, {id: command.id, type: 'response', action: 'count', value: result});
},
add: function (command, socket) {
var result = nDataBroker.dataMap.add(command.key, command.value);
var response = {id: command.id, type: 'response', action: 'add', value: result};
send(socket, response);
},
concat: function (command, socket) {
var result = nDataBroker.dataMap.concat(command.key, command.value);
var response = {id: command.id, type: 'response', action: 'concat'};
if (command.getValue) {
response.value = result;
}
send(socket, response);
},
registerDeathQuery: function (command, socket) {
var response = {id: command.id, type: 'response', action: 'registerDeathQuery'};
if (initialized[socket.id]) {
initialized[socket.id].deathQuery = command.value;
}
send(socket, response);
},
run: function (command, socket) {
var ret = {id: command.id, type: 'response', action: 'run'};
try {
var result = nDataBroker.run(command.value, command.baseKey);
if (result !== undefined) {
ret.value = result;
}
} catch(e) {
if (e.stack) {
e = e.stack;
}
ret.error = 'nData Error - Exception at run(): ' + e;
}
if (!command.noAck) {
send(socket, ret);
}
},
remove: function (command, socket) {
var result = nDataBroker.dataMap.remove(command.key);
if (!command.noAck) {
var response = {id: command.id, type: 'response', action: 'remove'};
if (command.getValue) {
response.value = result;
}
send(socket, response);
}
},
removeRange: function (command, socket) {
var result = nDataBroker.dataMap.removeRange(command.key, command.fromIndex, command.toIndex);
if (!command.noAck) {
var response = {id: command.id, type: 'response', action: 'removeRange'};
if (command.getValue) {
response.value = result;
}
send(socket, response);
}
},
removeAll: function (command, socket) {
nDataBroker.dataMap.removeAll();
if (!command.noAck) {
send(socket, {id: command.id, type: 'response', action: 'removeAll'});
}
},
splice: function (command, socket) {
var args = [command.key, command.index, command.count];
if (command.items) {
args = args.concat(command.items);
}
// Remove any consecutive undefined references from end of array
for (var i = args.length - 1; i >= 0; i--) {
if (args[i] !== undefined) {
break;
}
args.pop();
}
var result = nDataBroker.dataMap.splice.apply(nDataBroker.dataMap, args);
if (!command.noAck) {
var response = {id: command.id, type: 'response', action: 'splice'};
if (command.getValue) {
response.value = result;
}
send(socket, response);
}
},
pop: function (command, socket) {
var result = nDataBroker.dataMap.pop(command.key);
if (!command.noAck) {
var response = {id: command.id, type: 'response', action: 'pop'};
if (command.getValue) {
response.value = result;
}
send(socket, response);
}
},
hasKey: function (command, socket) {
send(socket, {id: command.id, type: 'response', action: 'hasKey', value: nDataBroker.dataMap.hasKey(command.key)});
},
subscribe: function (command, socket) {
var hasListener = anyHasListener(command.channel);
addListener(socket, command.channel);
if (!hasListener) {
nDataBroker.emit('subscribe', command.channel);
}
send(socket, {id: command.id, type: 'response', action: 'subscribe', channel: command.channel});
},
unsubscribe: function (command, socket) {
if (command.channel) {
removeListener(socket, command.channel);
var hasListener = anyHasListener(command.channel);
if (!hasListener) {
nDataBroker.emit('unsubscribe', command.channel);
}
} else {
var channels = removeAllListeners(socket);
for (var i in channels) {
if (channels.hasOwnProperty(i)) {
if (!anyHasListener(channels[i])) {
nDataBroker.emit('unsubscribe', channels[i]);
}
}
}
}
send(socket, {id: command.id, type: 'response', action: 'unsubscribe', channel: command.channel});
},
isSubscribed: function (command, socket) {
var result = channelMap.hasKey(['sockets', socket.id, command.channel]);
send(socket, {id: command.id, type: 'response', action: 'isSubscribed', channel: command.channel, value: result});
},
publish: function (command, socket) {
nDataBroker.publish(command.channel, command.value);
var response = {id: command.id, type: 'response', action: 'publish', channel: command.channel};
if (command.getValue) {
response.value = command.value;
}
nDataBroker.emit('publish', command.channel, command.value);
send(socket, response);
},
send: function (command, socket) {
nDataBroker.emit('message', command.value, function (err, data) {
var response = {
id: command.id,
type: 'response',
action: 'send',
value: data
};
if (err) {
response.error = err;
}
send(socket, response);
});
}
};
var MAX_ID = Math.pow(2, 53) - 2;
var curID = 1;
var genID = function () {
curID++;
curID = curID % MAX_ID;
return curID;
};
var server = com.createServer();
var connections = {};
var handleConnection = errorDomain.bind(function (sock) {
errorDomain.add(sock);
sock.id = genID();
connections[sock.id] = sock;
sock.on('message', function (command) {
if (!SECRET_KEY || initialized.hasOwnProperty(sock.id) || command.action == 'init') {
try {
if (actions[command.action]) {
actions[command.action](command, sock);
}
} catch(e) {
if (e.stack) {
console.log(e.stack);
} else {
console.log(e);
}
if (e instanceof Error) {
e = e.toString();
}
send(sock, {id: command.id, type: 'response', action: command.action, error: 'nData Error - Failed to process command due to the following error: ' + e});
}
} else {
var e = 'nData Error - Cannot process command before init handshake';
console.log(e);
send(sock, {id: command.id, type: 'response', action: command.action, error: e});
}
});
sock.on('close', function () {
delete connections[sock.id];
if (initialized[sock.id]) {
if (initialized[sock.id].deathQuery) {
run(initialized[sock.id].deathQuery);
}
delete initialized[sock.id];
}
var channels = removeAllListeners(sock);
for (var i in channels) {
if (channels.hasOwnProperty(i)) {
if (!anyHasListener(channels[i])) {
nDataBroker.emit('unsubscribe', channels[i]);
}
}
}
errorDomain.remove(sock);
});
});
errorDomain.add(server);
server.on('connection', handleConnection);
server.on('listening', function () {
process.send({event: 'listening'});
});
process.on('message', function (m) {
if (m && m.type == 'masterMessage') {
nDataBroker.emit('masterMessage', m.data);
}
});
process.on('SIGTERM', function () {
server.close(function () {
process.exit();
});
for (var i in connections) {
if (connections.hasOwnProperty(i)) {
connections[i].destroy();
}
}
setTimeout(function () {
process.exit();
}, PROCESS_TERM_TIMEOUT);
});
if (SOCKET_PATH) {
if (process.platform != 'win32' && fs.existsSync(SOCKET_PATH)) {
fs.unlinkSync(SOCKET_PATH)
}
server.listen(SOCKET_PATH);
} else {
server.listen(PORT);
}
setInterval(function () {
var keys = dataExpirer.extractExpiredKeys();
var len = keys.length;
for (var i = 0; i < len; i++) {
dataMap.remove(keys[i]);
}
}, EXPIRY_ACCURACY);