Fixed wkhtmltopdf error handling
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parent
9e2f8b6231
commit
2339543fd4
57
app/pdf.js
57
app/pdf.js
@ -1,6 +1,34 @@
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var spawn = require('child_process').spawn;
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var fs = require('fs');
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function waitForJavaScript() {
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if(window.MathJax) {
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// Amazon EC2: fix TeX font detection
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MathJax.Hub.Register.StartupHook("HTML-CSS Jax Startup",function () {
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var HTMLCSS = MathJax.OutputJax["HTML-CSS"];
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HTMLCSS.Font.checkWebFont = function (check,font,callback) {
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if (check.time(callback)) {
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return;
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}
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if (check.total === 0) {
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HTMLCSS.Font.testFont(font);
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setTimeout(check,200);
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} else {
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callback(check.STATUS.OK);
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}
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};
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});
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MathJax.Hub.Queue(function () {
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window.status = 'done';
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});
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}
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else {
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setTimeout(function() {
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window.status = 'done';
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}, 2000);
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}
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}
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var authorizedPageSizes = [
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'A3',
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'A4',
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@ -46,7 +74,10 @@ module.exports = function(req, res, next) {
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// wkhtmltopdf can't access /dev/stdout on Amazon EC2 for some reason
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var filePath = '/tmp/' + Date.now() + '.pdf';
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var wkhtmltopdf = spawn('wkhtmltopdf', params.concat('--window-status', 'done', '-', filePath), {
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var binPath = process.env.WKHTMLTOPDF_PATH || 'wkhtmltopdf';
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params.push('--run-script', waitForJavaScript.toString() + 'waitForJavaScript()');
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params.push('--window-status', 'done');
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var wkhtmltopdf = spawn(binPath, params.concat('-', filePath), {
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stdio: [
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'pipe',
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'ignore',
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@ -56,19 +87,37 @@ module.exports = function(req, res, next) {
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function onError(err) {
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next(err);
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}
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function onUnknownError() {
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res.statusCode = 400;
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res.end('Unknown error');
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}
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function onTimeout() {
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res.statusCode = 408;
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res.end('Request timeout');
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}
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var timeoutId = setTimeout(function() {
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timeoutId = undefined;
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wkhtmltopdf.kill();
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}, 30000);
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wkhtmltopdf.on('error', onError);
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wkhtmltopdf.stdin.on('error', onError);
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wkhtmltopdf.on('close', function(code) {
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if(!timeoutId) {
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return onTimeout();
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}
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clearTimeout(timeoutId);
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if(code) {
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res.statusCode = 400;
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return res.end('Unknown error');
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return onUnknownError();
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}
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var readStream = fs.createReadStream(filePath);
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readStream.on('open', function() {
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readStream.pipe(res);
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});
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readStream.on('close', function() {
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fs.unlink(filePath, function() {
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});
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});
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readStream.pipe(res);
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readStream.on('error', onUnknownError);
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});
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req.pipe(wkhtmltopdf.stdin);
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};
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