1. import re
  3. def compare_log_entries(log_file, expected_values):
  4. """
  5. Compares log entries from a file against expected values.
  7. Args:
  8. log_file (str): Path to the log file.
  9. expected_values (dict): A dictionary where keys are log entry patterns
  10. (regex) and values are the expected values.
  12. Returns:
  13. list: A list of discrepancies found. Empty list if no discrepancies.
  14. """
  15. discrepancies = []
  17. try:
  18. with open(log_file, 'r') as f:
  19. for line in f:
  20. for pattern, expected in expected_values.items():
  21. match = re.search(pattern, line)
  22. if match:
  23. actual = match.group(1) # Assuming the value is in group 1
  24. if actual != str(expected): #Compare as strings.
  25. discrepancies.append({
  26. 'line': line.strip(),
  27. 'pattern': pattern,
  28. 'expected': expected,
  29. 'actual': actual
  30. })
  31. except FileNotFoundError:
  32. print(f"Error: Log file not found: {log_file}")
  33. return None
  35. return discrepancies
  37. if __name__ == '__main__':
  38. # Example Usage
  39. log_file = 'non_production.log'
  40. expected_values = {
  41. r'User logged in: (.*)': 'testuser',
  42. r'Request processed: (.*)': 'GET /api/data',
  43. r'Error: (.*)': 'Invalid input'
  44. }
  46. # Create a dummy log file for testing
  47. with open(log_file, 'w') as f:
  48. f.write("User logged in: adminuser\n")
  49. f.write("Request processed: POST /api/submit\n")
  50. f.write("Error: Permission denied\n")
  51. f.write("User logged in: testuser\n")
  52. f.write("Request processed: GET /api/data\n")
  54. discrepancies = compare_log_entries(log_file, expected_values)
  56. if discrepancies:
  57. print("Discrepancies found:")
  58. for diff in discrepancies:
  59. print(f" Line: {diff['line']}")
  60. print(f" Pattern: {diff['pattern']}")
  61. print(f" Expected: {diff['expected']}")
  62. print(f" Actual: {diff['actual']}")
  63. print("-" * 20)
  64. else:
  65. print("No discrepancies found.")

Add your comment