enigma-bbs/core/door.js

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/* jslint node: true */
'use strict';
const stringFormat = require('./string_format.js');
const events = require('events');
const _ = require('lodash');
const pty = require('ptyw.js');
const decode = require('iconv-lite').decode;
const createServer = require('net').createServer;
exports.Door = Door;
function Door(client, exeInfo) {
events.EventEmitter.call(this);
const self = this;
this.client = client;
this.exeInfo = exeInfo;
this.exeInfo.encoding = this.exeInfo.encoding || 'cp437';
this.exeInfo.encoding = this.exeInfo.encoding.toLowerCase();
let restored = false;
//
// Members of exeInfo:
// cmd
// args[]
// env{}
// cwd
// io
// encoding
// dropFile
// node
// inhSocket
//
this.doorDataHandler = function(data) {
if(self.client.term.outputEncoding === self.exeInfo.encoding) {
self.client.term.rawWrite(data);
} else {
self.client.term.write(decode(data, self.exeInfo.encoding));
}
};
this.restoreIo = 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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};
this.prepareSocketIoServer = function(cb) {
if('socket' === self.exeInfo.io) {
const sockServer = createServer(conn => {
sockServer.getConnections( (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', self.doorDataHandler);
conn.once('end', () => {
return self.restoreIo(conn);
});
conn.once('error', err => {
self.client.log.info( { error : err.toString() }, 'Door socket server connection');
return self.restoreIo(conn);
});
}
});
});
sockServer.listen(0, () => {
return cb(null, sockServer);
});
} else {
return cb(null);
}
};
this.doorExited = function() {
self.emit('finished');
};
}
require('util').inherits(Door, events.EventEmitter);
Door.prototype.run = function() {
const self = this;
this.prepareSocketIoServer( (err, sockServer) => {
if(err) {
this.client.log.warn( { error : err.toString() }, 'Failed executing door');
return self.doorExited();
}
// Expand arg strings, e.g. {dropFile} -> DOOR32.SYS
let args = _.clone(self.exeInfo.args); // we need a copy so the original is not modified
for(let i = 0; i < args.length; ++i) {
args[i] = stringFormat(self.exeInfo.args[i], {
dropFile : self.exeInfo.dropFile,
node : self.exeInfo.node.toString(),
srvPort : sockServer ? sockServer.address().port.toString() : '-1',
userId : self.client.user.userId.toString(),
});
}
const 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', self.doorDataHandler);
door.once('close', () => {
return self.restoreIo(door);
});
} else if('socket' === self.exeInfo.io) {
self.client.log.debug( { port : sockServer.address().port }, 'Using temporary socket server for door I/O');
}
door.once('exit', exitCode => {
self.client.log.info( { exitCode : exitCode }, 'Door exited');
if(sockServer) {
sockServer.close();
}
// we may not get a close
if('stdio' === self.exeInfo.io) {
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self.restoreIo(door);
}
door.removeAllListeners();
return self.doorExited();
});
});
};