1. import argparse
  2. import logging
  3. import sys
  4. from urllib.parse import urlparse, parse_qs
  6. # Configure logging
  7. logging.basicConfig(
  8. level=logging.INFO,
  9. format="%(asctime)s - %(levelname)s - %(message)s",
  10. stream=sys.stdout,
  11. )
  14. def watch_url_params(url_pattern, callback):
  15. """
  16. Watches for changes in URL parameters matching a pattern and calls a callback function
  17. when changes are detected.
  18. """
  19. logging.info(f"Watching URL pattern: {url_pattern}")
  21. # Parse the URL pattern to extract parameter names
  22. parsed_pattern = urlparse(url_pattern)
  23. parameter_names = [p for p in parsed_pattern.path.split('/') if p] # Extract parameter names
  25. # Initial state of URL parameters
  26. initial_params = parse_qs(parsed_pattern.query)
  28. while True:
  29. try:
  30. # Get the current URL
  31. current_url = input("Enter URL to check (or type exit): ")
  32. if current_url.lower() == 'exit':
  33. break
  35. # Parse current URL
  36. parsed_url = urlparse(current_url)
  37. current_params = parse_qs(parsed_url.query)
  39. # Check for changes in parameters
  40. param_changed = False
  41. for param_name in parameter_names:
  42. if param_name in current_params and param_name in initial_params:
  43. if current_params[param_name] != initial_params[param_name]:
  44. param_changed = True
  45. logging.debug(f"Parameter '{param_name}' changed from '{initial_params[param_name]}' to '{current_params[param_name]}'")
  46. elif param_name in current_params:
  47. param_changed = True
  48. logging.debug(f"Parameter '{param_name}' added: '{current_params[param_name]}'")
  49. elif param_name in initial_params:
  50. param_changed = True
  51. logging.debug(f"Parameter '{param_name}' removed")
  53. if param_changed:
  54. callback(current_url, current_params)
  56. # Update initial parameters for the next iteration
  57. initial_params = current_params.copy()
  59. if not param_changed:
  60. logging.debug("No parameter changes detected.")
  62. except Exception as e:
  63. logging.error(f"An error occurred: {e}")
  64. #Consider adding a sleep here to avoid tight loop causing resource exhaustion
  68. if __name__ == "__main__":
  69. # Example usage:
  70. url_pattern = "/items/?id=*&sort=name" # Example URL pattern
  72. def my_callback(url, params):
  73. """
  74. Callback function to be executed when URL parameters change.
  75. """
  76. logging.info(f"URL changed: {url}")
  77. logging.info(f"New parameters: {params}")
  79. watch_url_params(url_pattern, my_callback)

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