dvcrn Website Monitor
Lightweight website monitoring — detect changes, downtime, or content patterns without external services.
Usage
Check if a site is up
python3 {baseDir}/scripts/monitor.py check https://example.com
Monitor for changes (compare to last snapshot)
python3 {baseDir}/scripts/monitor.py watch https://example.com --state-dir /tmp/monitor-state
Returns exit code 0 if unchanged, 1 if changed (with diff), 2 if down.
Check for specific content
python3 {baseDir}/scripts/monitor.py match https://example.com/pricing --pattern "Enterprise plan"
Returns exit code 0 if pattern found, 1 if not found.
Batch monitor from file
# sites.txt: one URL per line
python3 {baseDir}/scripts/monitor.py batch sites.txt --state-dir /tmp/monitor-state
Integration with OpenClaw
Heartbeat check
Add to your HEARTBEAT.md:
Run website monitor batch check on sites.txt.
If any site is down or changed, notify me.
Cron job
# Check every 30 minutes
openclaw cron add --every 30m --task "Run website monitor on my sites list and alert me if anything changed"
Features
- 🔍 Change detection with text diff
- ⬆️ Uptime checking (HTTP status + response time)
- 🎯 Pattern matching (regex supported)
- 📁 File-based state (no database needed)
- 📋 Batch monitoring from URL list
- 🪶 Zero dependencies beyond Python stdlib + requests
Dependencies
pip3 install requests
How State Works
When using watch mode, the script saves a hash of each page's text content in --state-dir. On the next run, it compares the current hash to the saved one. If different, it reports the change and shows a text diff.
State files are named by URL hash, so you can monitor hundreds of sites without collision.