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