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feat(ch07s02): Add readiness probe switch (#152)

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This commit is contained in:
Marek Czernek
2021-07-06 03:19:35 -04:00
committed by GitHub
parent 237c9e14fe
commit 9ac3d08fa7
3 changed files with 56 additions and 48 deletions
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5
.gitignore vendored
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@@ -69,3 +69,8 @@ nb-configuration.xml
## OS X
##########################
.DS_Store
##########################
## JavaScript
##########################
node_modules/

97
probes/app.js
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@@ -1,68 +1,71 @@
var express = require('express'),
app = express();
app = express();
var port = process.env.PORT || process.env.OPENSHIFT_NODEJS_PORT || 8080,
ip = process.env.IP || process.env.OPENSHIFT_NODEJS_IP || '0.0.0.0';
ip = process.env.IP || process.env.OPENSHIFT_NODEJS_IP || '0.0.0.0',
healthy = true,
ready = true;
var route = express.Router();
// global var to track app health
var healthy = true;
app.use('/', route);
// A route that says hello
route.get('/', function(req, res) {
res.send('Hello! This is the index page for the app.\n');
route.get('/', function (req, res) {
res.send('Hello! This is the index page for the app.\n');
});
// A route that returns readiness status
// simulates readiness 30 seconds after start up
route.get('/ready', function(req, res) {
var now = Math.floor(Date.now() / 1000);
var lapsed = now - started;
if (lapsed > 30) {
console.log('ping /ready => pong [ready]');
res.send('Ready for service requests...\n');
}
else {
console.log('ping /ready => pong [notready]');
res.status(503);
res.send('Error! Service not ready for requests...\n');
}
route.get('/ready', function (req, res) {
var now = Math.floor(Date.now() / 1000);
var lapsed = now - started;
if (ready && (lapsed > 30)) {
console.log('ping /ready => pong [ready]');
res.send('Ready for service requests...\n');
}
else {
console.log('ping /ready => pong [notready]');
res.status(503);
res.send('Error! Service not ready for requests...\n');
}
});
// A route that returns health status
route.get('/healthz', function(req, res) {
if (healthy) {
console.log('ping /healthz => pong [healthy]');
res.send('OK\n');
}
else {
console.log('ping /healthz => pong [unhealthy]');
res.status(503);
res.send('Error!. App not healthy!\n');
}
route.get('/healthz', function (req, res) {
if (healthy) {
console.log('ping /healthz => pong [healthy]');
res.send('OK\n');
}
else {
console.log('ping /healthz => pong [unhealthy]');
res.status(503);
res.send('Error! App not healthy!\n');
}
});
// This route handles switching the state of the app
route.route('/flip').get(function(req, res) {
var flag = req.query.op;
if (flag == "kill") {
console.log('Received kill request. Changing app state to unhealthy...');
healthy = false;
res.send('Switched app state to unhealthy...\n');
}
else if (flag == "awaken") {
console.log('Received awaken request. Changing app state to healthy...');
healthy = true;
res.send('Switched app state to healthy...\n');
}
else {
res.send('Error! unknown flag...\n');
}
});
route.route('/flip').get(function (req, res) {
var flag = req.query.op;
if (flag === 'kill-health') {
console.log('Received kill request for health probe.');
healthy = false;
res.send('Switched app state to unhealthy...\n');
} else if (flag === "awaken-health") {
console.log('Received awaken request for health probe.');
healthy = true;
res.send('Switched app state to healthy...\n');
} else if (flag === 'kill-ready') {
console.log('Received kill request for readiness probe.');
ready = false;
res.send('Switched app state to not ready...\n');
} else if (flag === 'awaken-ready') {
console.log('Received awaken request for readiness probe.');
ready = true;
res.send('Switched app state to ready...\n');
} else {
res.send('Error! unknown flag...\n');
}
});
app.listen(port, ip);
console.log('nodejs server running on http://%s:%s', ip, port);

2
probes/package.json
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@@ -9,6 +9,6 @@
"author": "Red Hat Training",
"license": "ASL",
"dependencies": {
"express": "4.14.x"
"express": "4.17.x"
}
}