enigma-bbs/core/door.js

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/* jslint node: true */
'use strict';
const stringFormat = require('./string_format.js');
const { Errors } = require('./enig_error.js');
const pty = require('node-pty');
const decode = require('iconv-lite').decode;
const createServer = require('net').createServer;
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module.exports = class Door {
constructor(client) {
this.client = client;
this.restored = false;
}
prepare(ioType, cb) {
this.io = ioType;
// we currently only have to do any real setup for 'socket'
if('socket' !== ioType) {
return cb(null);
}
this.sockServer = createServer(conn => {
this.sockServer.getConnections( (err, count) => {
// We expect only one connection from our DOOR/emulator/etc.
if(!err && count <= 1) {
this.client.term.output.pipe(conn);
conn.on('data', this.doorDataHandler.bind(this));
conn.once('end', () => {
return this.restoreIo(conn);
});
conn.once('error', err => {
this.client.log.info( { error : err.message }, 'Door socket server connection');
return this.restoreIo(conn);
});
}
});
});
this.sockServer.listen(0, () => {
return cb(null);
});
}
run(exeInfo, cb) {
this.encoding = (exeInfo.encoding || 'cp437').toLowerCase();
if('socket' === this.io && !this.sockServer) {
return cb(Errors.UnexpectedState('Socket server is not running'));
}
const formatObj = {
dropFile : exeInfo.dropFile,
dropFilePath : exeInfo.dropFilePath,
node : exeInfo.node.toString(),
srvPort : this.sockServer ? this.sockServer.address().port.toString() : '-1',
userId : this.client.user.userId.toString(),
};
const args = exeInfo.args.map( arg => stringFormat(arg, formatObj) );
const door = pty.spawn(exeInfo.cmd, args, {
cols : this.client.term.termWidth,
rows : this.client.term.termHeight,
// :TODO: cwd
env : exeInfo.env,
encoding : null, // we want to handle all encoding ourself
});
if('stdio' === this.io) {
this.client.log.debug('Using stdio for door I/O');
this.client.term.output.pipe(door);
door.on('data', this.doorDataHandler.bind(this));
door.once('close', () => {
return this.restoreIo(door);
});
} else if('socket' === this.io) {
this.client.log.debug(
{ srvPort : this.sockServer.address().port, srvSocket : this.sockServerSocket },
'Using temporary socket server for door I/O'
);
}
door.once('exit', exitCode => {
this.client.log.info( { exitCode : exitCode }, 'Door exited');
if(this.sockServer) {
this.sockServer.close();
}
// we may not get a close
if('stdio' === this.io) {
this.restoreIo(door);
}
door.removeAllListeners();
return cb(null);
});
}
doorDataHandler(data) {
this.client.term.write(decode(data, this.encoding));
}
restoreIo(piped) {
if(!this.restored && this.client.term.output) {
this.client.term.output.unpipe(piped);
this.client.term.output.resume();
this.restored = true;
}
}
};