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/*
* routing-proxy.js: A routing proxy consuming a RoutingTable and multiple HttpProxy instances
*
* (C) 2011 Nodejitsu Inc.
* MIT LICENCE
*
*/
var events = require('events'),
utile = require('utile'),
HttpProxy = require('./http-proxy').HttpProxy,
ProxyTable = require('./proxy-table').ProxyTable;
//
// ### function RoutingProxy (options)
// #### @options {Object} Options for this instance
// Constructor function for the RoutingProxy object, a higher level
// reverse proxy Object which can proxy to multiple hosts and also interface
// easily with a RoutingTable instance.
//
var RoutingProxy = exports.RoutingProxy = function (options) {
events.EventEmitter.call(this);
var self = this;
options = options || {};
if (options.router) {
this.proxyTable = new ProxyTable(options);
this.proxyTable.on('routes', function (routes) {
self.emit('routes', routes);
});
}
//
// Create a set of `HttpProxy` objects to be used later on calls
// to `.proxyRequest()` and `.proxyWebSocketRequest()`.
//
this.proxies = {};
//
// Setup default target options (such as `https`).
//
this.target = {};
this.target.https = options.target && options.target.https;
//
// Setup other default options to be used for instances of
// `HttpProxy` created by this `RoutingProxy` instance.
//
this.source = options.source || { host: 'localhost', port: 8000 };
this.https = this.source.https || options.https;
this.enable = options.enable;
this.forward = options.forward;
this.changeOrigin = options.changeOrigin || false;
//
// Listen for 'newListener' events so that we can bind 'proxyError'
// listeners to each HttpProxy's 'proxyError' event.
//
this.on('newListener', function (evt) {
if (evt === 'proxyError' || evt === 'webSocketProxyError') {
Object.keys(self.proxies).forEach(function (key) {
self.proxies[key].on(evt, self.emit.bind(self, evt));
});
}
});
};
//
// Inherit from `events.EventEmitter`.
//
utile.inherits(RoutingProxy, events.EventEmitter);
//
// ### function add (options)
// #### @options {Object} Options for the `HttpProxy` to add.
// Adds a new instance of `HttpProxy` to this `RoutingProxy` instance
// for the specified `options.host` and `options.port`.
//
RoutingProxy.prototype.add = function (options) {
var self = this,
key = this._getKey(options);
//
// TODO: Consume properties in `options` related to the `ProxyTable`.
//
options.target = options.target || {};
options.target.host = options.target.host || options.host;
options.target.port = options.target.port || options.port;
options.target.socketPath = options.target.socketPath || options.socketPath;
options.target.https = this.target && this.target.https ||
options.target && options.target.https;
//
// Setup options to pass-thru to the new `HttpProxy` instance
// for the specified `options.host` and `options.port` pair.
//
['https', 'enable', 'forward', 'changeOrigin'].forEach(function (key) {
if (options[key] !== false && self[key]) {
options[key] = self[key];
}
});
this.proxies[key] = new HttpProxy(options);
if (this.listeners('proxyError').length > 0) {
this.proxies[key].on('proxyError', this.emit.bind(this, 'proxyError'));
}
if (this.listeners('webSocketProxyError').length > 0) {
this.proxies[key].on('webSocketProxyError', this.emit.bind(this, 'webSocketProxyError'));
}
[
'start',
'forward',
'end',
'proxyResponse',
'websocket:start',
'websocket:end',
'websocket:incoming',
'websocket:outgoing'
].forEach(function (event) {
this.proxies[key].on(event, this.emit.bind(this, event));
}, this);
};
//
// ### function remove (options)
// #### @options {Object} Options mapping to the `HttpProxy` to remove.
// Removes an instance of `HttpProxy` from this `RoutingProxy` instance
// for the specified `options.host` and `options.port` (if they exist).
//
RoutingProxy.prototype.remove = function (options) {
var key = this._getKey(options),
proxy = this.proxies[key];
delete this.proxies[key];
return proxy;
};
//
// ### function close()
// Cleans up any state left behind (sockets, timeouts, etc)
// associated with this instance.
//
RoutingProxy.prototype.close = function () {
var self = this;
if (this.proxyTable) {
//
// Close the `RoutingTable` associated with
// this instance (if any).
//
this.proxyTable.close();
}
//
// Close all sockets for all `HttpProxy` object(s)
// associated with this instance.
//
Object.keys(this.proxies).forEach(function (key) {
self.proxies[key].close();
});
};
//
// ### function proxyRequest (req, res, [port, host, paused])
// #### @req {ServerRequest} Incoming HTTP Request to proxy.
// #### @res {ServerResponse} Outgoing HTTP Request to write proxied data to.
// #### @options {Object} Options for the outgoing proxy request.
//
// options.port {number} Port to use on the proxy target host.
// options.host {string} Host of the proxy target.
// options.buffer {Object} Result from `httpProxy.buffer(req)`
// options.https {Object|boolean} Settings for https.
//
RoutingProxy.prototype.proxyRequest = function (req, res, options) {
options = options || {};
var location;
//
// Check the proxy table for this instance to see if we need
// to get the proxy location for the request supplied. We will
// always ignore the proxyTable if an explicit `port` and `host`
// arguments are supplied to `proxyRequest`.
//
if (this.proxyTable && !options.host) {
location = this.proxyTable.getProxyLocation(req);
//
// If no location is returned from the ProxyTable instance
// then respond with `404` since we do not have a valid proxy target.
//
if (!location) {
try {
if (!this.emit('notFound', req, res)) {
res.writeHead(404);
res.end();
}
}
catch (er) {
console.error("res.writeHead/res.end error: %s", er.message);
}
return;
}
//
// When using the ProxyTable in conjunction with an HttpProxy instance
// only the following arguments are valid:
//
// * `proxy.proxyRequest(req, res, { host: 'localhost' })`: This will be skipped
// * `proxy.proxyRequest(req, res, { buffer: buffer })`: Buffer will get updated appropriately
// * `proxy.proxyRequest(req, res)`: Options will be assigned appropriately.
//
options.port = location.port;
options.host = location.host;
}
var key = this._getKey(options),
proxy;
if ((this.target && this.target.https)
|| (location && location.protocol === 'https')) {
options.target = options.target || {};
options.target.https = true;
}
if (!this.proxies[key]) {
this.add(utile.clone(options));
}
proxy = this.proxies[key];
proxy.proxyRequest(req, res, options.buffer);
};
//
// ### function proxyWebSocketRequest (req, socket, head, options)
// #### @req {ServerRequest} Websocket request to proxy.
// #### @socket {net.Socket} Socket for the underlying HTTP request
// #### @head {string} Headers for the Websocket request.
// #### @options {Object} Options to use when proxying this request.
//
// options.port {number} Port to use on the proxy target host.
// options.host {string} Host of the proxy target.
// options.buffer {Object} Result from `httpProxy.buffer(req)`
// options.https {Object|boolean} Settings for https.
//
RoutingProxy.prototype.proxyWebSocketRequest = function (req, socket, head, options) {
options = options || {};
var location,
proxy,
key;
if (this.proxyTable && !options.host) {
location = this.proxyTable.getProxyLocation(req);
if (!location) {
return socket.destroy();
}
options.port = location.port;
options.host = location.host;
}
key = this._getKey(options);
if (!this.proxies[key]) {
this.add(utile.clone(options));
}
proxy = this.proxies[key];
proxy.proxyWebSocketRequest(req, socket, head, options.buffer);
};
//
// ### function addHost (host, target)
// #### @host {String} Host to add to proxyTable
// #### @target {String} Target to add to proxyTable
// Adds a host to proxyTable
//
RoutingProxy.prototype.addHost = function (host, target) {
if (this.proxyTable) {
this.proxyTable.addRoute(host, target);
}
};
//
// ### function removeHost (host)
// #### @host {String} Host to remove from proxyTable
// Removes a host to proxyTable
//
RoutingProxy.prototype.removeHost = function (host) {
if (this.proxyTable) {
this.proxyTable.removeRoute(host);
}
};
//
// ### @private function _getKey (options)
// #### @options {Object} Options to extract the key from
// Ensures that the appropriate options are present in the `options`
// provided and responds with a string key representing the `host`, `port`
// combination contained within.
//
RoutingProxy.prototype._getKey = function (options) {
if (!options || ((!options.host || !options.port)
&& (!options.target || !options.target.host || !options.target.port))) {
throw new Error('options.host and options.port or options.target are required.');
}
return [
options.host || options.target.host,
options.port || options.target.port
].join(':');
};
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