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64 lines
1.9 KiB
JavaScript
64 lines
1.9 KiB
JavaScript
/*
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simple-balancer.js: Example of a simple round robin balancer
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Copyright (c) Nodejitsu 2013
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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var http = require('http'),
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httpProxy = require('../../lib/http-proxy');
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//
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// A simple round-robin load balancing strategy.
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//
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// First, list the servers you want to use in your rotation.
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//
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var addresses = [
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{
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host: 'ws1.0.0.0',
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port: 80
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},
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{
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host: 'ws2.0.0.0',
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port: 80
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}
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];
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var proxy = httpProxy.createServer();
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http.createServer(function (req, res) {
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//
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// On each request, get the first location from the list...
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//
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var target = { target: addresses.shift() };
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//
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// ...then proxy to the server whose 'turn' it is...
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//
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console.log('balancing request to: ', target);
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proxy.web(req, res, target);
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//
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// ...and then the server you just used becomes the last item in the list.
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//
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addresses.push(target.target);
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}).listen(8021);
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// Rinse; repeat; enjoy.
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