var express = require('express'),
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app = express();
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var port = process.env.PORT || process.env.OPENSHIFT_NODEJS_PORT || 8080,
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ip = process.env.IP || process.env.OPENSHIFT_NODEJS_IP || '0.0.0.0';
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var route = express.Router();
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// global var to track app health
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var healthy = true;
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app.use('/', route);
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// A route that says hello
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route.get('/', function(req, res) {
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res.send('Hello! This is the index page for the app.\n');
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});
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// A route that returns readiness status
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// simulates readiness 30 seconds after start up
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route.get('/ready', function(req, res) {
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var now = Math.floor(Date.now() / 1000);
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var lapsed = now - started;
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if (lapsed > 30) {
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console.log('ping /ready => pong [ready]');
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res.send('Ready for service requests...\n');
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}
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else {
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console.log('ping /ready => pong [notready]');
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res.status(503);
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res.send('Error! Service not ready for requests...\n');
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}
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});
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// A route that returns health status
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route.get('/healthz', function(req, res) {
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if (healthy) {
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console.log('ping /healthz => pong [healthy]');
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res.send('OK\n');
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}
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else {
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console.log('ping /healthz => pong [unhealthy]');
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res.status(503);
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res.send('Error!. App not healthy!\n');
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}
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});
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// This route handles switching the state of the app
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route.route('/flip').get(function(req, res) {
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var flag = req.query.op;
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if (flag == "kill") {
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console.log('Received kill request. Changing app state to unhealthy...');
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healthy = false;
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res.send('Switched app state to unhealthy...\n');
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}
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else if (flag == "awaken") {
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console.log('Received awaken request. Changing app state to healthy...');
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healthy = true;
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res.send('Switched app state to healthy...\n');
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}
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else {
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res.send('Error! unknown flag...\n');
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}
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});
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app.listen(port, ip);
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console.log('nodejs server running on http://%s:%s', ip, port);
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var started = Math.floor(Date.now() / 1000);
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module.exports = app;
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