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PONode.js - Domain per Express request, inside another domain
 

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    <p><strong>Error handling in Node. Argh!</strong></p> <p>I'm trying to layout a basic Node app like this...</p> <blockquote> <p>Cluster -> Worker -> Server Domain -> Express Request Domain</p> </blockquote> <p>So, if an error is thrown 18 layers deep into a call stack because someone misspelled their name on a login form, the entire server doesn't crash.</p> <p>Here's some basic code to simulate the worker part:</p> <pre><code>var domain, server; domain = require('domain'); server = domain.create(); server.on('error', function(e) { console.log('total meltdown...', e.stack); }); server.run(function() { var express = require('express')(); express.configure(function() { // Domain on EVERY request express.use(function(req, res, next) { var d = domain.create(); d.on('error', function(e) { console.log('fired REQUEST error', e.stack); next(e); }); d.run(next); }); // Generic error handler express.use(function(e, req, res, next) { res.status(500); res.end('oops'); }); // Serve the request with a blatent error express.get('/', function(req, res) { this_function_does_not_exist(); res.end('we will never get here'); }); }); // Fire 'er up express.listen(3000); }); </code></pre> <p><strong>What I'm expecting...</strong></p> <p>I curl <code>http://localhost:3000/</code>, get a nice little 'oops' error, and see 'fired REQUEST error' and the error stack in the console.</p> <p><strong>What actually happens...</strong></p> <p>I get this both as the browser response, and in the console...</p> <blockquote> <p>ReferenceError: this_function_does_not_exist is not defined at /Stuff/test.js:38:13 at callbacks (/Stuff/node_modules/express/lib/router/index.js:161:37) at param (/Stuff/node_modules/express/lib/router/index.js:135:11) at pass (/Stuff/node_modules/express/lib/router/index.js:142:5) at Router._dispatch (/Stuff/node_modules/express/lib/router/index.js:170:5) at Object.router (/Stuff/node_modules/express/lib/router/index.js:33:10) at next (/Stuff/node_modules/express/node_modules/connect/lib/proto.js:190:15) at next (/Stuff/node_modules/express/node_modules/connect/lib/proto.js:192:9) at b (domain.js:183:18) at Domain.run (domain.js:123:23)</p> </blockquote> <p>Now why would it go and do something like that?</p>
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