From 00990345b6f3dc53a80ac968f3f03346e7bb7fd8 Mon Sep 17 00:00:00 2001
From: Ivan Chavero <ichavero@chavero.com.mx>
Date: Tue, 16 Jul 2019 08:25:16 +0200
Subject: [PATCH] ch07s02 add application for GE
---
probes/package.json | 14 +++++++
probes/app.js | 71 +++++++++++++++++++++++++++++++++++
2 files changed, 85 insertions(+), 0 deletions(-)
diff --git a/probes/app.js b/probes/app.js
new file mode 100644
index 0000000..47eb49d
--- /dev/null
+++ b/probes/app.js
@@ -0,0 +1,71 @@
+var express = require('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';
+
+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');
+});
+
+// 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');
+ }
+});
+
+// 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');
+ }
+});
+
+// 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');
+ }
+ });
+
+app.listen(port, ip);
+console.log('nodejs server running on http://%s:%s', ip, port);
+var started = Math.floor(Date.now() / 1000);
+
+module.exports = app;
diff --git a/probes/package.json b/probes/package.json
new file mode 100644
index 0000000..2993890
--- /dev/null
+++ b/probes/package.json
@@ -0,0 +1,14 @@
+{
+ "name": "probes",
+ "version": "1.0.0",
+ "description": "A simple Node.js app to demonstrate readiness and liveness probes",
+ "main": "app.js",
+ "scripts": {
+ "start": "node app.js"
+ },
+ "author": "Red Hat Training",
+ "license": "ASL",
+ "dependencies": {
+ "express": "4.14.x"
+ }
+}
--
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