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An example using domains in an HTTP server
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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. | ||
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var domain = require('domain'); | ||
var http = require('http'); | ||
var assert = require('assert'); | ||
var common = require('../common.js'); | ||
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var objects = { foo: 'bar', baz: {}, num: 42, arr: [1,2,3] }; | ||
objects.baz.asdf = objects; | ||
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var serverCaught = 0; | ||
var clientCaught = 0 | ||
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var server = http.createServer(function(req, res) { | ||
var dom = domain.create(); | ||
dom.add(req); | ||
dom.add(res); | ||
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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'); | ||
}); | ||
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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, '')]); | ||
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// this line will throw if you pick an unknown key | ||
assert(data !== undefined, 'Data should not be undefined'); | ||
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res.writeHead(200); | ||
res.end(data); | ||
}); | ||
}); | ||
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server.listen(common.PORT, next); | ||
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function next() { | ||
console.log('listening on localhost:%d', common.PORT); | ||
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// now hit it a few times | ||
var dom = domain.create(); | ||
var requests = 0; | ||
var responses = 0; | ||
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makeReq('/'); | ||
makeReq('/foo'); | ||
makeReq('/arr'); | ||
makeReq('/baz'); | ||
makeReq('/num'); | ||
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function makeReq(p) { | ||
requests++; | ||
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var dom = domain.create(); | ||
dom.on('error', function(er) { | ||
clientCaught++; | ||
console.log('client error', er); | ||
// kill everything. | ||
dom.dispose(); | ||
}); | ||
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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(); | ||
} | ||
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dom.add(res); | ||
var d = ''; | ||
res.on('data', function(c) { | ||
d += c; | ||
}); | ||
res.on('end', function() { | ||
d = JSON.parse(d); | ||
console.log('json!', d); | ||
}); | ||
}); | ||
} | ||
} | ||
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process.on('exit', function() { | ||
assert.equal(serverCaught, 2); | ||
assert.equal(clientCaught, 2); | ||
console.log('ok'); | ||
}); |