mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Math
synced 2024-12-20 19:32:39 +00:00
162 lines
3.7 KiB
JavaScript
162 lines
3.7 KiB
JavaScript
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/*
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* Storoid worker.
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*
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* Configure in storoid.config.json.
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*/
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// global includes
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var express = require('express'),
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cluster = require('cluster'),
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http = require('http'),
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fs = require('fs'),
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child_process = require('child_process'),
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querystring = require('querystring');
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var config;
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// Get the config
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try {
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config = JSON.parse(fs.readFileSync('./mathoid.config.json', 'utf8'));
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} catch ( e ) {
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// Build a skeleton localSettings to prevent errors later.
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console.error("Please set up your mathoid.config.json from the example " +
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"storoid.config.json.example");
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process.exit(1);
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}
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/**
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* The name of this instance.
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* @property {string}
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*/
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var instanceName = cluster.isWorker ? 'worker(' + process.pid + ')' : 'master';
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console.log( ' - ' + instanceName + ' loading...' );
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/*
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* Backend setup
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*/
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var restarts = 10;
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var backend,
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backendPort,
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requestQueue = [];
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var startBackend = function () {
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if (backend) {
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backend.kill();
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}
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var backendCB = function (err, stdout, stderr) {
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if (err) {
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restarts--;
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if (restarts > 0) {
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startBackend();
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}
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console.error(err.toString());
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process.exit(1);
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}
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};
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backendPort = Math.floor(9000 + Math.random() * 50000);
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console.error(instanceName + ': Starting backend on port ' + backendPort);
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backend = child_process.exec('phantomjs main.js ' + backendPort, backendCB);
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backend.stdout.pipe(process.stdout);
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backend.stderr.pipe(process.stderr);
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};
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startBackend();
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/* -------------------- Web service --------------------- */
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var app = express.createServer();
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// Increase the form field size limit from the 2M default.
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app.use(express.bodyParser({maxFieldsSize: 25 * 1024 * 1024}));
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app.use( express.limit( '25mb' ) );
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app.get('/', function(req, res){
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res.write('<html><body>\n');
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res.write('Welcome to Mathoid. POST to / with var <code>tex</code>');
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res.write('<form action="/" method="POST"><input type="text" name="tex"></form>');
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res.end('</body></html>');
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});
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// robots.txt: no indexing.
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app.get(/^\/robots.txt$/, function ( req, res ) {
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res.end( "User-agent: *\nDisallow: /\n" );
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});
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var handleRequests = function() {
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// Call the next request on the queue
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if (requestQueue.length) {
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requestQueue[0]();
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}
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};
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function handleRequest(req, res, tex) {
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// do the backend request
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var query = new Buffer(querystring.stringify({tex:tex})),
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options = {
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hostname: 'localhost',
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port: backendPort.toString(),
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path: '/',
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method: 'POST',
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headers: {
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'Content-Length': query.length,
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'Content-Type': 'application/x-www-form-urlencoded',
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'Connection': 'close'
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},
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agent: false
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};
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var chunks = [];
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//console.log(options);
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var httpreq = http.request(options, function(httpres) {
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httpres.on('data', function(chunk) {
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chunks.push(chunk);
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});
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httpres.on('end', function() {
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var buf = Buffer.concat(chunks);
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res.writeHead(200,
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{
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'Content-type': 'application/json',
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'Content-length': buf.length
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});
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res.write(buf);
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res.end();
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requestQueue.shift();
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handleRequests();
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});
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});
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httpreq.on('error', function(err) {
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console.log('error', err.toString());
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res.writeHead(500);
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return res.end(JSON.stringify({error: "Backend error: " + err.toString()}));
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});
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httpreq.end(query);
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}
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app.post(/^\/$/, function ( req, res ) {
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// First some rudimentary input validation
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if (!req.body.tex) {
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res.writeHead(400);
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return res.end(JSON.stringify({error: "'tex' post parameter is missing!"}));
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}
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var tex = req.body.tex;
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requestQueue.push(handleRequest.bind(null, req, res, tex));
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// phantomjs only handles one request at a time. Enforce this.
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if (requestQueue.length === 1) {
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// Start this process
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handleRequests();
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}
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});
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console.log( ' - ' + instanceName + ' ready' );
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module.exports = app;
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