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AphlictClientServer.js
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AphlictClientServer.js
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'use strict';
var JX = require('./javelin').JX;
require('./AphlictListenerList');
var url = require('url');
var util = require('util');
var WebSocket = require('ws');
JX.install('AphlictClientServer', {
construct: function(server) {
server.on('request', JX.bind(this, this._onrequest));
this._server = server;
this._lists = {};
this._adminServers = [];
},
properties: {
logger: null,
adminServers: null
},
members: {
_server: null,
_lists: null,
getListenerList: function(instance) {
if (!this._lists[instance]) {
this._lists[instance] = new JX.AphlictListenerList(instance);
}
return this._lists[instance];
},
getHistory: function(age) {
var results = [];
var servers = this.getAdminServers();
for (var ii = 0; ii < servers.length; ii++) {
var messages = servers[ii].getHistory(age);
for (var jj = 0; jj < messages.length; jj++) {
results.push(messages[jj]);
}
}
return results;
},
log: function() {
var logger = this.getLogger();
if (!logger) {
return;
}
logger.log.apply(logger, arguments);
return this;
},
trace: function() {
var logger = this.getLogger();
if (!logger) {
return;
}
logger.trace.apply(logger, arguments);
return this;
},
_onrequest: function(request, response) {
// The websocket code upgrades connections before they get here, so
// this only handles normal HTTP connections. We just fail them with
// a 501 response.
response.writeHead(501);
response.end('HTTP/501 Use Websockets\n');
},
_parseInstanceFromPath: function(path) {
// If there's no "~" marker in the path, it's not an instance name.
// Users sometimes configure nginx or Apache to proxy based on the
// path.
if (path.indexOf('~') === -1) {
return 'default';
}
var instance = path.split('~')[1];
// Remove any "/" characters.
instance = instance.replace(/\//g, '');
if (!instance.length) {
return 'default';
}
return instance;
},
listen: function() {
var self = this;
var server = this._server.listen.apply(this._server, arguments);
var wss = new WebSocket.Server({server: server});
// This function checks for upgradeReq which is only available in
// ws2 by default, not ws3. See T12755 for more information.
wss.on('connection', function(ws, request) {
if ('upgradeReq' in ws) {
request = ws.upgradeReq;
}
var path = url.parse(request.url).pathname;
var instance = self._parseInstanceFromPath(path);
var listener = self.getListenerList(instance).addListener(ws);
function msg(argv) {
return util.format('<%s>', listener.getDescription()) +
' ' +
util.format.apply(null, argv);
}
function log() {
self.log(msg(arguments));
}
function trace() {
self.trace(msg(arguments));
}
trace('Connected from %s.', ws._socket.remoteAddress);
ws.on('message', function(data) {
trace('Received message: %s', data);
var message;
try {
message = JSON.parse(data);
} catch (err) {
log('Message is invalid: %s', err.message);
return;
}
switch (message.command) {
case 'subscribe':
trace(
'Subscribed to: %s',
JSON.stringify(message.data));
listener.subscribe(message.data);
break;
case 'unsubscribe':
trace(
'Unsubscribed from: %s',
JSON.stringify(message.data));
listener.unsubscribe(message.data);
break;
case 'replay':
var age = message.data.age || 60000;
var min_age = (new Date().getTime() - age);
var old_messages = self.getHistory(min_age);
for (var ii = 0; ii < old_messages.length; ii++) {
var old_message = old_messages[ii];
if (!listener.isSubscribedToAny(old_message.subscribers)) {
continue;
}
try {
listener.writeMessage(old_message);
} catch (error) {
break;
}
}
break;
case 'ping':
var pong = {
type: 'pong'
};
try {
listener.writeMessage(pong);
} catch (error) {
// Ignore any issues here, we'll clean up elsewhere.
}
break;
default:
log(
'Unrecognized command "%s".',
message.command || '<undefined>');
}
});
ws.on('close', function() {
self.getListenerList(instance).removeListener(listener);
trace('Disconnected.');
});
});
}
}
});

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AphlictClientServer.js (5 KB)

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