scripts/watchdog.sh

#!/bin/bash

# Configuration
LOG_FILE="$HOME/code/visa_photo_maker/watchdog.log"
# Associative array: Port -> PM2 Process Name
declare -A APPS=( ["13002"]="visa-backend" ["13001"]="visa-frontend" )

# Check each port
for PORT in "${!APPS[@]}"; do
    APP_NAME=${APPS[$PORT]}
    
    # Check if port is listening (local only)
    if ! nc -z localhost $PORT; then
        TIMESTAMP=$(date "+%Y-%m-%d %H:%M:%S")
        echo "[$TIMESTAMP] 🚨 ALERT: $APP_NAME (Port $PORT) is DOWN!" >> $LOG_FILE
        
        # Check if PM2 manages this process before restarting
        if pm2 describe $APP_NAME > /dev/null 2>&1; then
            echo "[$TIMESTAMP] 🔄 Attempting PM2 restart for $APP_NAME..." >> $LOG_FILE
            pm2 restart $APP_NAME
            
            # Double check after 5 seconds
            sleep 5
            if nc -z localhost $PORT; then
                echo "[$TIMESTAMP] ✅ RECOVERY: $APP_NAME is back online." >> $LOG_FILE
            else
                echo "[$TIMESTAMP] ❌ ERROR: $APP_NAME failed to restart." >> $LOG_FILE
            fi
        else
            echo "[$TIMESTAMP] ⚠️ WARNING: PM2 process '$APP_NAME' not found!" >> $LOG_FILE
        fi
    fi
done