ChangeMonitor

ChangeMonitor is an application for monitoring changes on websites.

The following features are supported:

• Chrome support – detect changes on pages using Javascript.
• Support for JSON and CSS selectors.
• Notifiers for changes – only Telegram is supported for now.
• Configurable interval for each website.
• Simple configuration using a JSON config file.
• Experimental WebUI.

Setup

The recommended way to run ChangeMonitor is using Docker. The below command should work well:

docker run -d --name changemonitor -v /path/to/config.json:/config/config.json -v /path/to/data:/data ordspilleren/changemonitor

Since ChangeMonitor compiles to a single binary, it will be equally easy to run it without Docker. You will find the compiled binaries in the releases section.

The application can be set up using the following environment variables:

• CONFIG_FILE Location of config file.
• STORAGE_DIRECTORY Location of storage directory.
• CHROME_PATH Location of Chrome/Chromium binary.
• CHROME_WS WebSocket path of Chrome DevTools.
• ENABLE_WEBUI Option to enable experimental WebUI.

If CHROME_WS is set, ChangeMonitor will try connecting to the specified URI. Otherwise, it will look for the binary specified in CHROME_PATH.

Docker Compose

Below is an example of a Docker Compose setup with an external Chrome browser as a container.

version: "3"
services:
  changemonitor:
    image: ordspilleren/changemonitor:latest
    container_name: changemonitor
    volumes:
      - type: bind
        source: /path/to/config.json
        target: /config/config.json
      - /path/to/data:/data
    environment:
      - CHROME_WS=ws://chrome:9222
    restart: unless-stopped

  chrome:
    image: zenika/alpine-chrome:latest
    container_name: chrome
    command: ["--no-sandbox", "--remote-debugging-address=0.0.0.0", "--remote-debugging-port=9222"]
    restart: unless-stopped

Configuration

ChangeMonitor is configured through a JSON config file. An example config can be found in config.example.json.

All fields except name, url and interval are optional.