basic plugin for healthcheck

healthcheck/index.js

diff --git a/healthcheck/index.js b/healthcheck/index.js
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--- /dev/null
+++ b/healthcheck/index.js
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+'use strict';
+
+var toobusy = require('toobusy-js');
+var debug = require('debug')('gateway:healthcheck');
+
+const HEALTHCHECK_URL = '/healthcheck';
+
+module.exports.init = function(config, logger, stats) {
+  return {
+   onrequest: function(req, res, next) {
+     var healthcheck_url = config['healthcheck_url'] ||  HEALTHCHECK_URL
+      if(healthcheck_url == req.url) {
+        var statusCode = (this.toobusy() ? 503 : 200)
+        debug(statusCode)
+        var healthInfo = {
+          memoryUsage: process.memoryUsage(),
+          cpuUsage: process.cpuUsage(),
+          uptime: process.uptime(),
+          pid: process.pid
+        }
+        res.writeHead(statusCode, { 'Content-Type': 'application/json' })
+        res.write(JSON.stringify(healthInfo))
+        res.end()
+      }
+      else
+        next()
+    }
+  }
+}

healthcheck/package.json

diff --git a/healthcheck/package.json b/healthcheck/package.json
new file mode 100644
index 0000000..001c9c5
--- /dev/null
+++ b/healthcheck/package.json
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+{
+  "name": "edgemicro-healthcheck",
+  "version": "1.0.0",
+  "description": "A basic plugin for healthcheck",
+  "dependencies": {
+    "debug": "^2.2.0",
+    "toobusy-js": "^0.5.1"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/apigee/microgateway-plugins.git"
+  },
+  "author": "srinandan",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/apigee/microgateway-plugins/issues"
+  },
+  "homepage": "https://github.com/apigee/microgateway-plugins#readme"
+}