Introduction to Logging in Django
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Presentation for the Bangalore Python User Group meetup event @ Google India: http://www.meetup.com/BangPypers/events/125755952/
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Introduction to Logging in Django
- 1. Introduction to Logging in Django Sivasubramaniam Arunachalam July 20, 2013 @sivaa_in http://www.meetup.com/BangPypers/events/125755952/
- 2. Agenda • Introduction to Logging • Python/Django Logging • Few Best Practices • Demo
- 4. Your Application misbehaved Next, what the user will do?
- 8. The Users • End Users • System Administrators • Developers • Support Team
- 9. The Questions • What • When • How Much • How to Control • How to Correlate to Log
- 10. What to Log? It’s an Art
- 11. Exceptions • No Managed Exceptions • Global Exception Handler
- 12. Events • Security Incidents • Life Cycle • Resource usage
- 14. Exceptions/Events alone will not help much
- 15. Debug Traces • User Input • System/API Calls • Method Invocation
- 16. And much more… • HTTP Requests • DB Calls • Threads
- 18. Logging in Django Python • Standard Module • Multiple Destinations • Custom Filtering Options
- 19. import logging • Loggers • Handlers • Filters • Formatters
- 20. Loggers • Entry Point • Unique Name • Log Level
- 21. Log Level • DEBUG • INFO • WARNING • ERROR • CRITICAL
- 22. Log Record • Log Level • Logger Name • Message – Error Code – Stack Trace • Others – Path, Line #, args, func
- 23. Handlers • Output Mechanism – File – Screen/Console – HTTP/Mail – Queue • Log Level
- 24. Default Handlers • StreamHandler • SocketHandler • DatagramHandler • SysLogHandler • NTEventLogHandler • MemoryHandler • FileHandler – Default – Rotating – TimedRotating – Watched • NullHandler • SMTPHandler • HTTPHandler
- 25. Handler 02Logger ‘X’ Handler N Handler 01
- 26. Handler E-MailPayment Logger Handler File Handler SMS
- 27. Handler E-MailPayment Logger Handler File Handler SMS ERROR
- 28. Filters • Conditional Filtering • Changing Log Levels • Chaining
- 29. Logger 02Filter ‘X’ Handler 01 Logger 01
- 30. Log Record will be Dropped, If • Log Level is lower than – Logger’s Log Level – Handler’s Log Level • Filter Chain returns a False
- 31. Formatters • The output text format • Python Formatting String
- 33. logging.method() • logger.log() • logger.critical() • logger.error() • logger.warning() • logger.info() • logger.debug() • logger.exception()
- 34. Django Extensions - Loggers 1. django 2. django.request 3. django.db.backends
- 35. django.request • 4xx -> WARNING • 5xx -> ERROR • Contexts – HTTP Status Code (Response) – Entire Request Object
- 36. django.db.backends • SQLs -> DEBUG • Only when DEBUG = True • Contexts – SQL Statement – Duration – Parameters
- 37. Django Extensions – Handlers • AdminEmailHandler
- 38. AdminEmailHandler • E-Mails -> Site Admins • Contexts – Request Object – Stack Trace • include_html = True/False – Full Trace/Local Vars/Settings
- 39. Django Extensions – Filters • CallBackFilter • RequireDebugFalse • RequireDebugTrue
- 40. CallBackFilter • Call Back Functions • Called with Log Record • From 1.4
- 41. RequireDebugFalse • DEBUG = False • From 1.4
- 42. RequireDebugTrue • DEBUG = True • From 1.5
- 43. settings.LOGGING
- 44. disable_existing_loggers • False - Merge • True - Ignore • From 1.5
- 47. SENTRY
- 48. Best Practices
- 50. No Single Logger For All Classes
- 52. Avoid “print” in development. Use “stdout” with a “StreamHandler”
- 53. Don’t Catch -> Log -> Re-raise Let the caller do that
- 54. Something terribly wrong? Don’t use logging alone. Raise a Exception to the caller. . Logging is NOT a way to deal with exceptions
- 55. Different Log File for each Environment LOG_ROOT = '/var/log/<project>/<env>/'
- 56. Un-handled Exceptions should be stored separately
- 57. Sensitive information’s in Logs
- 58. Size of the Log Files • Text Editor Problems • Archive via Scripts • Compress to Save Space
- 60. Be aware of cluster nodes server<id>_node<id>_<logname>.log
- 61. is_debug()
- 62. I/O Performance
- 63. Batch Logging
- 64. No Repeated Logs & Stack Traces
- 66. End Users -> No Stack Trace Please!