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repl_server.js
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repl_server.js
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// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
'use strict';
var chalk = require('chalk');
var EventEmitter = require('events').EventEmitter;
var Logger = require('debug-logtron');
var replr = require('replr');
var util = require('util');
var tchan = require('../channel');
var endhand = require('../endpoint-handler');
var TermServer = require('./term_server');
function main() {
var chan = tchan({
serviceName: 'repl-server',
handler: endhand(),
logger: Logger('replserver')
});
var statefulThing = {
counter: 1
};
var repler = replr.create({
name: 'tchannel repl server example',
mode: 'noserver',
prompt: chalk.gray('tchanrepl> '),
useColors: true,
useGlobal: true,
ignoreUndefined: true,
exports: function replrExports() {
return {
increment: function increment() {
return statefulThing.counter++;
},
getStatefulThing: function getStatefulThing() {
return statefulThing;
}
};
}
});
var server = TermServer({
logger: chan.logger,
create: function create(sessionId, options, callback) {
callback(null, ReplSession(repler, {
logger: chan.logger
}));
}
});
server.register(chan.handler);
chan.listen(4040, '127.0.0.1');
}
function ReplSession(repler, options) {
if (!(this instanceof ReplSession)) {
return new ReplSession(repler, options);
}
options = options || {};
var self = this;
self.repler = repler;
self.logger = options.logger;
}
util.inherits(ReplSession, EventEmitter);
ReplSession.prototype.start = function start(stream) {
var self = this;
self.once('resize', function onResize(size) {
self.repler.open(stream, {
width: size.cols,
height: size.rows
});
});
};
ReplSession.prototype.control = function control(stream) {
var self = this;
stream.on('data', function onControlData(obj) {
if (obj.op === 'resize') {
self.logger.info('resize to', obj);
self.emit('resize', obj);
} else {
self.logger.error('invalid control op', obj);
}
});
};
if (require.main === module) {
main();
}