1. import os
  2. import logging
  4. logging.basicConfig(level=logging.ERROR)
  6. def get_env_var(var_name, default_value=None):
  7. """
  8. Retrieves an environment variable with a default value and handles errors.
  9. """
  10. try:
  11. value = os.environ.get(var_name)
  12. if value is None:
  13. return default_value # Return default if not found
  14. return value
  15. except Exception as e:
  16. logging.error(f"Error getting environment variable '{var_name}': {e}")
  17. return default_value
  19. def safe_read_int(var_name, default=None):
  20. """
  21. Reads an integer from an environment variable, handling errors.
  22. """
  23. try:
  24. value = get_env_var(var_name)
  25. if value is None:
  26. return default
  27. return int(value)
  28. except ValueError:
  29. logging.error(f"Invalid integer value for '{var_name}': {get_env_var(var_name)}")
  30. return default
  31. except Exception as e:
  32. logging.error(f"Error reading integer from '{var_name}': {e}")
  33. return default
  35. def safe_read_float(var_name, default=None):
  36. """
  37. Reads a float from an environment variable, handling errors.
  38. """
  39. try:
  40. value = get_env_var(var_name)
  41. if value is None:
  42. return default
  43. return float(value)
  44. except ValueError:
  45. logging.error(f"Invalid float value for '{var_name}': {get_env_var(var_name)}")
  46. return default
  47. except Exception as e:
  48. logging.error(f"Error reading float from '{var_name}': {e}")
  49. return default
  52. def safe_read_list(var_name, default=None):
  53. """
  54. Reads a list from an environment variable, handling errors.
  55. """
  56. try:
  57. value = get_env_var(var_name)
  58. if value is None:
  59. return default
  60. return eval(value) # Use eval cautiously; consider safer alternatives if possible
  61. except (NameError, SyntaxError):
  62. logging.error(f"Invalid list format for '{var_name}': {get_env_var(var_name)}")
  63. return default
  64. except Exception as e:
  65. logging.error(f"Error reading list from '{var_name}': {e}")
  66. return default
  69. if __name__ == '__main__':
  70. # Example Usage
  71. db_host = get_env_var("DB_HOST", "localhost")
  72. port = safe_read_int("PORT", 8080)
  73. api_keys = safe_read_list("API_KEYS", [])
  74. debug_mode = safe_read_int("DEBUG", 0)
  76. print(f"DB Host: {db_host}")
  77. print(f"Port: {port}")
  78. print(f"API Keys: {api_keys}")
  79. print(f"Debug Mode: {debug_mode}")

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