LEDMatrix/web_interface/start.py

#!/usr/bin/env python3
"""
LED Matrix Web Interface V3 Startup Script
Modern web interface with real-time display preview and plugin management.
"""

import os
import socket
import subprocess
import sys
import logging
from pathlib import Path

def get_local_ips():
    """Get list of local IP addresses the service will be accessible on."""
    ips = []
    
    # Check if AP mode is active
    try:
        result = subprocess.run(
            ["systemctl", "is-active", "hostapd"],
            capture_output=True,
            text=True,
            timeout=2
        )
        if result.returncode == 0 and result.stdout.strip() == "active":
            ips.append("192.168.4.1 (AP Mode)")
    except Exception:  # nosec B110 - AP mode IP detection is non-critical startup info; systemctl may not exist
        pass
    
    # Get IPs from hostname -I
    try:
        result = subprocess.run(
            ["hostname", "-I"],
            capture_output=True,
            text=True,
            timeout=2
        )
        if result.returncode == 0:
            for ip in result.stdout.strip().split():
                ip = ip.strip()
                if ip and not ip.startswith("127.") and ip != "192.168.4.1":
                    ips.append(ip)
    except Exception:  # nosec B110 - hostname -I output parsing; non-critical startup info
        pass
    
    # Fallback: try socket method
    if not ips:
        try:
            s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            try:
                s.connect(('8.8.8.8', 80))
                ip = s.getsockname()[0]
                if ip and not ip.startswith("127."):
                    ips.append(ip)
            finally:
                s.close()
        except Exception:
            pass
    
    return ips if ips else ["localhost"]

def main():
    """Main startup function."""
    # Change to project root directory
    project_root = Path(__file__).parent.parent
    os.chdir(project_root)
    
    # Add to Python path
    sys.path.insert(0, str(project_root))
    
    # Configure logging to suppress non-critical socket errors
    # These occur when clients disconnect and are harmless
    werkzeug_logger = logging.getLogger('werkzeug')
    original_log_exception = werkzeug_logger.error
    
    def log_exception_filtered(message, *args, **kwargs):
        """Filter out non-critical socket errors from werkzeug logs."""
        if isinstance(message, str):
            # Suppress "No route to host" and similar connection errors
            if 'No route to host' in message or 'errno 113' in message:
                # Log at debug level instead of error
                werkzeug_logger.debug(message, *args, **kwargs)
                return
            # Suppress broken pipe errors (client disconnected)
            if 'Broken pipe' in message or 'errno 32' in message:
                werkzeug_logger.debug(message, *args, **kwargs)
                return
        # For exceptions, check if it's a socket error
        if 'exc_info' in kwargs and kwargs['exc_info']:
            exc_type, exc_value, exc_tb = kwargs['exc_info']
            if isinstance(exc_value, OSError):
                # Suppress common non-critical socket errors
                if exc_value.errno in (113, 32, 104):  # No route to host, Broken pipe, Connection reset
                    werkzeug_logger.debug(message, *args, **kwargs)
                    return
        # Log everything else normally
        original_log_exception(message, *args, **kwargs)
    
    werkzeug_logger.error = log_exception_filtered
    
    # Import and run the Flask app
    from web_interface.app import app
    
    print("Starting LED Matrix Web Interface V3...")
    print("Web server binding to: 0.0.0.0:5000")
    
    # Get and display accessible IP addresses
    ips = get_local_ips()
    if ips:
        print("Access the interface at:")
        for ip in ips:
            if "AP Mode" in ip:
                print("  - http://192.168.4.1:5000 (AP Mode - connect to LEDMatrix-Setup WiFi)")
            else:
                print(f"  - http://{ip}:5000")
    else:
        print("  - http://localhost:5000 (local only)")
        print("  - http://<your-pi-ip>:5000 (replace with your Pi's IP address)")
    
    # Run the web server with error handling for client disconnections
    try:
        # threaded=True is Flask's default since 1.0, but set it explicitly
        # so it's self-documenting: the two /api/v3/stream/* SSE endpoints
        # hold long-lived connections and would starve other requests under
        # a single-threaded server.
        app.run(host='0.0.0.0', port=5000, debug=False, threaded=True)
    except (OSError, BrokenPipeError) as e:
        # Suppress non-critical socket errors (client disconnections)
        if isinstance(e, OSError) and e.errno in (113, 32, 104):  # No route to host, Broken pipe, Connection reset
            werkzeug_logger.debug(f"Client disconnected: {e}", exc_info=True)
            # Re-raise only if it's not a client disconnection error
            if e.errno not in (113, 32, 104):
                raise
        else:
            raise

if __name__ == '__main__':
    main()