server.js.txt

/**
* @license Apache-2.0
*
* Copyright (c) 2019 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

'use strict';

var net = require( 'net' );
var REPL = require( './../../lib' );

// Define a counter for keeping track of the number of current connections:
var connections = 0;

// Create a new TCP server:
var server = net.createServer( onSocket );

// Start listening for TCP connections:
server.listen( 1337 );
console.log( 'Listening for connections on port %d.', 1337 );

function onSocket( socket ) {
	var repl;
	var opts;

	connections += 1;
	console.log( 'Established a new connection.' );
	console.log( 'Connections: %d.', connections );

	// Define REPL options, leveraging the fact that a socket connection is a duplex stream:
	opts = {
		'input': socket,
		'output': socket,
		'global': true,
		'isTTY': true
	};

	// Create a new REPL instance:
	repl = new REPL( opts );

	// Listen for when the REPL exits:
	repl.on( 'exit', onExit );

	function onExit() {
		// When a REPL exits, we can close the socket:
		socket.end();
		connections -= 1;
		console.log( 'Client exited REPL. Connection closed.' );
		console.log( 'Connections: %d.', connections );
	}
}