158 lines
3.8 KiB
JavaScript
158 lines
3.8 KiB
JavaScript
var url = require('url');
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var EventEmitter = require('events').EventEmitter;
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var request = require('request');
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var debug = require('debug')('localtunnel:client');
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var TunnelCluster = require('./TunnelCluster');
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var Tunnel = function(opt) {
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if (!(this instanceof Tunnel)) {
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return new Tunnel(opt);
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}
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var self = this;
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self._closed = false;
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self._opt = opt || {};
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self._opt.host = self._opt.host || 'https://localtunnel.me';
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};
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Tunnel.prototype.__proto__ = EventEmitter.prototype;
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// initialize connection
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// callback with connection info
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Tunnel.prototype._init = function(cb) {
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var self = this;
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var opt = self._opt;
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var params = {
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path: '/',
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json: true
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};
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var base_uri = opt.host + '/';
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// optionally override the upstream server
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var upstream = url.parse(opt.host);
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// no subdomain at first, maybe use requested domain
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var assigned_domain = opt.subdomain;
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// where to quest
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params.uri = base_uri + ((assigned_domain) ? assigned_domain : '?new');
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(function get_url() {
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request(params, function(err, res, body) {
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if (err) {
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// TODO (shtylman) don't print to stdout?
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console.log('tunnel server offline: ' + err.message + ', retry 1s');
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return setTimeout(get_url, 1000);
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}
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if (res.statusCode !== 200) {
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var err = new Error((body && body.message) || 'localtunnel server returned an error, please try again');
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return cb(err);
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}
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var port = body.port;
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var host = upstream.hostname;
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var max_conn = body.max_conn_count || 1;
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cb(null, {
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remote_host: upstream.hostname,
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remote_port: body.port,
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name: body.id,
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url: body.url,
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max_conn: max_conn
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});
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});
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})();
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};
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Tunnel.prototype._establish = function(info) {
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var self = this;
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var opt = self._opt;
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// increase max event listeners so that localtunnel consumers don't get
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// warning messages as soon as they setup even one listener. See #71
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self.setMaxListeners(info.max_conn + (EventEmitter.defaultMaxListeners || 10));
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info.local_host = opt.local_host;
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info.local_port = opt.port;
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var tunnels = self.tunnel_cluster = TunnelCluster(info);
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// only emit the url the first time
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tunnels.once('open', function() {
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self.emit('url', info.url);
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});
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// re-emit socket error
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tunnels.on('error', function(err) {
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self.emit('error', err);
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});
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var tunnel_count = 0;
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// track open count
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tunnels.on('open', function(tunnel) {
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tunnel_count++;
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debug('tunnel open [total: %d]', tunnel_count);
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var close_handler = function() {
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tunnel.destroy();
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};
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if (self._closed) {
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return close_handler();
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}
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self.once('close', close_handler);
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tunnel.once('close', function() {
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self.removeListener('close', close_handler);
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});
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});
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// when a tunnel dies, open a new one
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tunnels.on('dead', function(tunnel) {
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tunnel_count--;
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debug('tunnel dead [total: %d]', tunnel_count);
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if (self._closed) {
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return;
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}
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tunnels.open();
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});
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// establish as many tunnels as allowed
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for (var count = 0 ; count < info.max_conn ; ++count) {
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tunnels.open();
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}
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};
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Tunnel.prototype.open = function(cb) {
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var self = this;
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self._init(function(err, info) {
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if (err) {
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return cb(err);
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}
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self.url = info.url;
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self._establish(info);
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cb();
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});
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};
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// shutdown tunnels
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Tunnel.prototype.close = function() {
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var self = this;
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self._closed = true;
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self.emit('close');
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};
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module.exports = Tunnel;
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