1. import re
  2. import time
  3. import random
  5. def validate_data(data, patterns, retry_interval=5, max_retries=3):
  6. """
  7. Validates user data against a list of patterns with retry mechanism.
  9. Args:
  10. data (dict): The user data to validate.
  11. patterns (dict): A dictionary where keys are field names and values are regex patterns.
  12. retry_interval (int): The interval (in seconds) between retries.
  13. max_retries (int): The maximum number of retry attempts.
  15. Returns:
  16. dict: A dictionary containing validation results for each field.
  17. Each field's result is a dictionary with 'valid' (bool) and 'message' (str).
  18. Returns None if validation fails after all retries.
  19. """
  20. results = {}
  21. for field, pattern in patterns.items():
  22. results[field] = {'valid': False, 'message': ''}
  23. for attempt in range(max_retries):
  24. try:
  25. if re.match(pattern, str(data.get(field, ''))): # Handle missing fields
  26. results[field]['valid'] = True
  27. results[field]['message'] = ''
  28. break # Validation successful, exit retry loop
  29. else:
  30. # Simulate a potential transient error
  31. if random.random() < 0.1: # 10% chance of failure
  32. time.sleep(retry_interval)
  33. else:
  34. pass #Pattern doesn't match
  35. except Exception as e:
  36. print(f"Validation error for field '{field}': {e}")
  37. if attempt < max_retries - 1:
  38. time.sleep(retry_interval)
  39. else:
  40. return None #validation failed after all retries
  42. if not results[field]['valid']:
  43. results[field]['message'] = f"Field '{field}' does not match pattern: {pattern}"
  44. return results
  46. if __name__ == '__main__':
  47. # Example Usage
  48. user_data = {
  49. 'username': 'valid_user',
  50. 'email': 'test@example.com',
  51. 'age': '30',
  52. 'phone': '123-456-7890'
  53. }
  55. patterns = {
  56. 'username': r'^[a-zA-Z0-9_]+$', # Alphanumeric and underscore
  57. 'email': r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$', # Basic email format
  58. 'age': r'^\d+$', # Only digits
  59. 'phone': r'^\d{3}-\d{3}-\d{4}$' # Specific phone number format
  60. }
  62. validation_results = validate_data(user_data, patterns)
  64. if validation_results:
  65. for field, result in validation_results.items():
  66. print(f"{field}: Valid={result['valid']}, Message={result['message']}")
  67. else:
  68. print("Data validation failed after multiple retries.")

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