heilo, is your server up or down?

heilo there

If you are looking for a NodeJS-based server status monitoring tool, heilo is for you. It is lightweight, simple to use, and has clean interface. It can be used programmatically as an npm module, or cli tool.

Default behaviour will ping a host every 10 minutes (configurable) to check if it is UP, UP with Error or DOWN.

NOTE: heilo does not come with any notification/reporting functionality. Though heilo provides an interface for you to write your own notification/reporting function. Here is an example on how you can write a simple email notification system using nodemailer and deploy to Now - heilo-mail.

Usage

NOTE: heilo requires Node 6.0.0 and above

Use Programmatically as Module

Install it as dependencies

npm install heilo --save

Use it

const heilo = require('heilo')

heilo('https://localhost', {
  interval: '10m',        // ping interval
  stopLooping = false,    // stop pinging, useful if you want to control the start/stop manually
  report = (error) => {}, // function to report any error (e.g. send email when server down)
  debug = false,          // log every ping result to STDOUT if set to true,
  fetchOptions = { method: 'GET' } // options passed to fetch(url, fetchOptions)
})

Refer to this example for more details on how to write the report function.

Use as CLI

Install it globally

npm install -g heilo

Run it

heilo <absolute_url_path> [options]

Here are some examples of its usage:

heilo http://localhost
heilo http://localhost -i 5m
heilo http://localhost -f ./examples/reporting.js

Options

Usage	Description	Default value
-h, --help	Output usage information	-
-d, --debug	Debug Mode (log to STDOUT)	false
-p, --port [port]	Specific port to ping	-
-i, --interval [interval]	String value of the ping interval (refer to ms module for available values)	'10m'
-f, --file FILE	.js file that exports a function to report any error (e.g. send email when server down)	-

Contribute

1. Fork this repository to your own GitHub account and then clone it to your local device
2. Uninstall heilo if it's already installed: npm uninstall -g heilo
3. Link it to the global module directory (to use heilo command everywhere): npm link
4. Once you make some changes, transpile the source code: npm run build
5. Use heilo command to test any cli changes
6. Test the Programmatic API: npm run example

Credit

Thanks to projects like micro and serve that gives me inspiration and a head-start on how to write and structure this module.