refactor: clean up shutdown and move sockets
This commit is contained in:
Bill Church
parent
3f22c8b8e0
commit
e0742db22f
2 changed files with 101 additions and 113 deletions
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@ -17,23 +17,23 @@ const server = require('http').Server(app);
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const favicon = require('serve-favicon');
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const io = require('socket.io')(server, config.socketio);
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const session = require('express-session')(config.express);
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const appSocket = require('./socket');
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const myutil = require('./util');
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const { setDefaultCredentials, basicAuth } = require('./util');
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const { webssh2debug, auditLog, logError } = require('./logging');
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const { reauth, connect, notfound, handleErrors } = require('./routes');
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myutil.setDefaultCredentials(config);
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setDefaultCredentials(config);
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// safe shutdown
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let remainingSeconds = config.safeShutdownDuration;
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let shutdownMode = false;
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let shutdownInterval = 0;
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let shutdownInterval;
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let connectionCount = 0;
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// eslint-disable-next-line consistent-return
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function safeShutdownGuard(req, res, next) {
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if (shutdownMode) {
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if (!shutdownMode) return next();
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res.status(503).end('Service unavailable: Server shutting down');
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} else {
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return next();
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}
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}
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// express
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app.use(safeShutdownGuard);
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@ -42,7 +42,7 @@ if (config.accesslog) app.use(logger('common'));
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app.disable('x-powered-by');
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app.use(favicon(path.join(publicPath, 'favicon.ico')));
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app.use('/ssh', express.static(publicPath, config.express.ssh));
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app.use(myutil.basicAuth);
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app.use(basicAuth);
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app.get('/ssh/reauth', reauth);
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app.get('/ssh/host/:host?', connect);
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app.use(notfound);
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@ -52,7 +52,7 @@ app.use(handleErrors);
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function stopApp(reason) {
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shutdownMode = false;
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if (reason) console.info(`Stopping: ${reason}`);
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if (shutdownInterval) clearInterval(shutdownInterval);
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clearInterval(shutdownInterval);
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io.close();
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server.close();
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}
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@ -66,39 +66,41 @@ io.use((socket, next) => {
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socket.request.res ? session(socket.request, socket.request.res, next) : next(next); // eslint disable-line
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});
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io.on('connection', (socket) => {
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connectionCount += 1;
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function countdownTimer() {
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if (!shutdownMode) clearInterval(shutdownInterval);
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remainingSeconds -= 1;
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if (remainingSeconds <= 0) {
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stopApp('Countdown is over');
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} else io.emit('shutdownCountdownUpdate', remainingSeconds);
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}
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const signals = ['SIGTERM', 'SIGINT'];
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signals.forEach((signal) =>
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process.on(signal, () => {
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if (shutdownMode) stopApp('Safe shutdown aborted, force quitting');
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if (!connectionCount > 0) stopApp('All connections ended');
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shutdownMode = true;
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console.error(
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`\r\n${connectionCount} client(s) are still connected.\r\nStarting a ${remainingSeconds} seconds countdown.\r\nPress Ctrl+C again to force quit`
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);
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if (!shutdownInterval) shutdownInterval = setInterval(countdownTimer, 1000);
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})
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);
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module.exports = { server, config };
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const onConnection = (socket) => {
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connectionCount += 1;
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socket.on('disconnect', () => {
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connectionCount -= 1;
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if (connectionCount <= 0 && shutdownMode) {
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stopApp('All clients disconnected');
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}
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});
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});
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socket.on('geometry', (cols, rows) => {
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socket.request.session.ssh.terminfo = { cols, rows };
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webssh2debug(socket, `SOCKET GEOMETRY: termCols = ${cols}, termRows = ${rows}`);
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});
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};
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const signals = ['SIGTERM', 'SIGINT'];
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signals.forEach((signal) =>
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process.on(signal, () => {
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if (shutdownMode) stopApp('Safe shutdown aborted, force quitting');
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else if (connectionCount > 0) {
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let remainingSeconds = config.safeShutdownDuration;
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shutdownMode = true;
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const message =
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connectionCount === 1 ? ' client is still connected' : ' clients are still connected';
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console.error(connectionCount + message);
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console.error(`Starting a ${remainingSeconds} seconds countdown`);
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console.error('Press Ctrl+C again to force quit');
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shutdownInterval = setInterval(() => {
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remainingSeconds -= 1;
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if (remainingSeconds <= 0) {
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stopApp('Countdown is over');
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} else {
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io.sockets.emit('shutdownCountdownUpdate', remainingSeconds);
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}
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}, 1000);
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} else stopApp();
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})
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);
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module.exports = { server, config };
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io.on('connection', onConnection);
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@ -13,9 +13,6 @@ const dnsPromises = require('dns').promises;
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const util = require('util');
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const { webssh2debug, auditLog, logError } = require('./logging');
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let termCols;
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let termRows;
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/**
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* parse conn errors
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* @param {object} socket Socket object
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@ -75,11 +72,6 @@ async function checkSubnet(socket) {
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// public
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module.exports = function appSocket(socket) {
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let login = false;
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socket.once('geometry', (cols, rows) => {
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termCols = cols;
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termRows = rows;
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webssh2debug(socket, `SOCKET GEOMETRY: termCols = ${cols}, termRows = ${rows}`);
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});
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socket.once('disconnecting', (reason) => {
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webssh2debug(socket, `SOCKET DISCONNECTING: ${reason}`);
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@ -138,13 +130,8 @@ module.exports = function appSocket(socket) {
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socket.emit('status', 'SSH CONNECTION ESTABLISHED');
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socket.emit('statusBackground', 'green');
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socket.emit('allowreplay', socket.request.session.ssh.allowreplay);
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conn.shell(
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{
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term: socket.request.session.ssh.term,
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cols: termCols,
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rows: termRows,
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},
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(err, stream) => {
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const { term, cols, rows } = socket.request.session.ssh;
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conn.shell({ term, cols, rows }, (err, stream) => {
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if (err) {
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logError(socket, `EXEC ERROR`, err);
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conn.end();
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@ -204,8 +191,7 @@ module.exports = function appSocket(socket) {
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stream.stderr.on('data', (data) => {
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console.error(`STDERR: ${data}`);
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});
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}
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);
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});
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});
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conn.on('end', (err) => {
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