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An example using domains in an HTTP server

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1 parent 0b738f1 commit bf7fda21b814f5fd78fd555520cfa74bf3f360bb @isaacs isaacs committed Apr 9, 2012
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  1. +115 −0 test/simple/test-domain-http-server.js
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115 test/simple/test-domain-http-server.js
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+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var domain = require('domain');
+var http = require('http');
+var assert = require('assert');
+var common = require('../common.js');
+
+var objects = { foo: 'bar', baz: {}, num: 42, arr: [1,2,3] };
+objects.baz.asdf = objects;
+
+var serverCaught = 0;
+var clientCaught = 0
+
+var server = http.createServer(function(req, res) {
+ var dom = domain.create();
+ dom.add(req);
+ dom.add(res);
+
+ dom.on('error', function(er) {
+ serverCaught++;
+ console.log('server error', er);
+ // try to send a 500. If that fails, oh well.
+ res.writeHead(500, {'content-type':'text/plain'});
+ res.end(er.stack || er.message || 'Unknown error');
+ });
+
+ var data;
+ dom.run(function() {
+ // Now, an action that has the potential to fail!
+ // if you request 'baz', then it'll throw a JSON circular ref error.
+ data = JSON.stringify(objects[req.url.replace(/[^a-z]/g, '')]);
+
+ // this line will throw if you pick an unknown key
+ assert(data !== undefined, 'Data should not be undefined');
+
+ res.writeHead(200);
+ res.end(data);
+ });
+});
+
+server.listen(common.PORT, next);
+
+function next() {
+ console.log('listening on localhost:%d', common.PORT);
+
+ // now hit it a few times
+ var dom = domain.create();
+ var requests = 0;
+ var responses = 0;
+
+ makeReq('/');
+ makeReq('/foo');
+ makeReq('/arr');
+ makeReq('/baz');
+ makeReq('/num');
+
+ function makeReq(p) {
+ requests++;
+
+ var dom = domain.create();
+ dom.on('error', function(er) {
+ clientCaught++;
+ console.log('client error', er);
+ // kill everything.
+ dom.dispose();
+ });
+
+ var req = http.get({ host: 'localhost', port: common.PORT, path: p });
+ dom.add(req);
+ req.on('response', function(res) {
+ responses++;
+ console.error('requests=%d responses=%d', requests, responses);
+ if (responses === requests) {
+ console.error('done, closing server');
+ // no more coming.
+ server.close();
+ }
+
+ dom.add(res);
+ var d = '';
+ res.on('data', function(c) {
+ d += c;
+ });
+ res.on('end', function() {
+ d = JSON.parse(d);
+ console.log('json!', d);
+ });
+ });
+ }
+}
+
+process.on('exit', function() {
+ assert.equal(serverCaught, 2);
+ assert.equal(clientCaught, 2);
+ console.log('ok');
+});

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