initial commit

Author: Khushil Khatri

.gitignore

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+node_modules

index.js

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+const HTTPS = require("https");
+const AWS = require("aws-sdk");
+
+AWS.config.update({ region: "us-east-1" }); // <-- Cloud Watch region name
+
+const CLOUD_WATCH = new AWS.CloudWatch({
+  apiVersion: "2010-08-01",
+  accessKeyId: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", // <-- access key
+  secretAccessKey: "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" // <-- secret access key
+});
+
+const URL = "https://example.com";
+const SEARCH_STRING = "UA-2181092-2";
+const VERSION = `1.0.0`;
+const MetricName = "example_status";
+const PageName = "example";
+
+exports.handler = () => {
+  // const main = () => {
+  console.log(VERSION);
+  HTTPS.get(URL, res => {
+    let str = "";
+    res.on("data", d => {
+      str += d.toString();
+    });
+    res.on("end", () => {
+      if (str.toString().indexOf(SEARCH_STRING) > -1) {
+        console.log("Passed");
+        let params = {
+          MetricData: [
+            {
+              MetricName: MetricName,
+              Dimensions: [
+                {
+                  Name: "PAGE_NAME",
+                  Value: PageName
+                }
+              ],
+              Unit: "Count",
+              Value: 5
+            }
+          ],
+          Namespace: "STATUS"
+        };
+        CLOUD_WATCH.putMetricData(params, function(err, data) {
+          if (err) {
+            console.log("Error", err);
+            return;
+          } else {
+            console.log("Success", JSON.stringify(data));
+            return;
+          }
+        });
+      } else {
+        console.log("Failed");
+        let params = {
+          MetricData: [
+            {
+              MetricName: MetricName,
+              Dimensions: [
+                {
+                  Name: "PAGE_NAME",
+                  Value: PageName
+                }
+              ],
+              Unit: "Count",
+              Value: 0
+            }
+          ],
+          Namespace: "STATUS"
+        };
+        CLOUD_WATCH.putMetricData(params, function(err, data) {
+          if (err) {
+            console.log("Error", err);
+            return;
+          } else {
+            console.log("Success", JSON.stringify(data));
+            return;
+          }
+        });
+      }
+    });
+  }).on("error", error => {
+    console.log("Something wrong");
+    let params = {
+      MetricData: [
+        {
+          MetricName: MetricName,
+          Dimensions: [
+            {
+              Name: "PAGE_NAME",
+              Value: PageName
+            }
+          ],
+          Unit: "Count",
+          Value: 0
+        }
+      ],
+      Namespace: "STATUS"
+    };
+    CLOUD_WATCH.putMetricData(params, function(err, data) {
+      if (err) {
+        console.log("Error", err);
+        return;
+      } else {
+        console.log("Success", JSON.stringify(data));
+        return;
+      }
+    });
+  });
+};

package-lock.json

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+{
+  "name": "status-checker",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "build": "zip -r ../status-check.zip ./"
+  },
+  "author": "Khushil Khatri",
+  "license": "ISC",
+  "dependencies": {
+    "aws-sdk": "^2.507.0"
+  }
+}

package.json

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+# Webpage status check AWS lambda
+
+Nodejs lambda webpage status checker
+
+## Usage
+
+Change The following things to make it work. (index.js)
+
+```javascript
+AWS.config.update({ region: "us-east-1" }); // <-- Cloud Watch region name
+
+const CLOUD_WATCH = new AWS.CloudWatch({
+  apiVersion: "2010-08-01",
+  accessKeyId: "xxxxxxxxxxxxxxxxx", // <-- access key
+  secretAccessKey: "xxxxxxxxxxxxxxxxxx" // <-- secret access key
+});
+const URL = "https://example.com"; // <-- Add page URL here for status
+const SEARCH_STRING = "Your string for check in body part";
+const VERSION = `1.0.0`;
+const MetricName = "example_status"; // <-- Metric name
+const PageName = "example"; // <-- Page name "not relevant to HTML title"
+```
+
+## AWS
+
+Log in with your AWS account and follow the steps.
+
+- Go to the IAM page of AWS.
+- Select Users from the sidebar.
+- Click on create a user.
+- Add username with programmatic access to that user click on next.
+- Now attach policy `CloudWatchFullAccess` and click next.
+- Add `accessKeyId`, `secretAccessKey`, into a `index.js` file.
+
+Or you can use roles instead of creating the user then you can comment `accessKeyId` and `secretAccessKey`.
+
+## Installation
+
+`npm i` install packages.
+
+`npm run build` this will create a zip file that you can upload on lambda.
+
+### Create a lambda function and configs
+
+- Go to the lambda page of AWS.
+- Create a new function.
+- Add your zip file on the lambda function.
+- Make the role of cloud watch if you have not added User detail in code.
+- Make lambda function execution time-limit 1-2 minutes.
+
+### Notifiction config
+
+This function will add a metric in the cloud watch if your webpage is up then you will send count `5` into the cloud watch metric or it will send `0` in metric.
+
+Now you can create a cloud watch alarm on metrics and create SNS alert on email.
+
+[https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-cloudwatch-createalarm.html](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-cloudwatch-createalarm.html)
+
+## Contributing
+
+Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
+
+Please make sure to update the tests as appropriate.
+
+## License
+
+[MIT](https://choosealicense.com/licenses/mit/)