enigma-bbs/core/door.js

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/* jslint node: true */
'use strict';
var spawn = require('child_process').spawn;
var events = require('events');
var _ = require('lodash');
var pty = require('ptyw.js');
var decode = require('iconv-lite').decode;
var net = require('net');
var async = require('async');
exports.Door = Door;
function Door(client, exeInfo) {
events.EventEmitter.call(this);
this.client = client;
this.exeInfo = exeInfo;
this.exeInfo.encoding = this.exeInfo.encoding || 'cp437';
//
// Members of exeInfo:
// cmd
// args[]
// env{}
// cwd
// io
// encoding
// dropFile
// node
// inhSocket
//
}
require('util').inherits(Door, events.EventEmitter);
Door.prototype.run = function() {
var self = this;
var doorData = function(data) {
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// :TODO: skip decoding if we have a match, e.g. cp437 === cp437
self.client.term.write(decode(data, self.exeInfo.encoding));
};
var restored = false;
var restore = function(piped) {
if(!restored && self.client.term.output) {
self.client.term.output.unpipe(piped);
self.client.term.output.resume();
restored = true;
}
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};
var sockServer;
async.series(
[
function prepareServer(callback) {
if('socket' === self.exeInfo.io) {
sockServer = net.createServer(function connected(conn) {
sockServer.getConnections(function connCount(err, count) {
// We expect only one connection from our DOOR/emulator/etc.
if(!err && count <= 1) {
self.client.term.output.pipe(conn);
conn.on('data', doorData);
conn.on('end', function ended() {
restore(conn);
});
conn.on('error', function error(err) {
self.client.log.info('Door socket server connection error: ' + err.message);
restore(conn);
});
}
});
});
sockServer.listen(0, function listening() {
callback(null);
});
} else {
callback(null);
}
},
function launch(callback) {
// Expand arg strings, e.g. {dropFile} -> DOOR32.SYS
var args = _.clone(self.exeInfo.args); // we need a copy so the original is not modified
for(var i = 0; i < args.length; ++i) {
args[i] = self.exeInfo.args[i].format({
dropFile : self.exeInfo.dropFile,
node : self.exeInfo.node.toString(),
//inhSocket : self.exeInfo.inhSocket.toString(),
srvPort : sockServer ? sockServer.address().port.toString() : '-1',
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userId : self.client.user.userId.toString(),
});
}
var door = pty.spawn(self.exeInfo.cmd, args, {
cols : self.client.term.termWidth,
rows : self.client.term.termHeight,
// :TODO: cwd
env : self.exeInfo.env,
});
if('stdio' === self.exeInfo.io) {
self.client.log.debug('Using stdio for door I/O');
self.client.term.output.pipe(door);
door.on('data', doorData);
door.on('close', function closed() {
restore(door);
});
} else if('socket' === self.exeInfo.io) {
self.client.log.debug(
{ port : sockServer.address().port },
'Using temporary socket server for door I/O');
}
door.on('exit', function exited(code) {
self.client.log.info( { code : code }, 'Door exited');
if(sockServer) {
sockServer.close();
}
// we may not get a close
if('stdio' === self.exeInfo.io) {
restore(door);
}
door.removeAllListeners();
self.emit('finished');
});
}
],
function complete(err) {
if(err) {
self.client.log.warn( { error : err.toString() }, 'Failed executing door');
}
}
);
};