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Debugging Nestoria London Perl Workshop
- 1. Planning for debugging Ed Freyfogle London Perl Workshop 28 Nov. 2008
- 2. Nestoria?
- 3. What could go wrong? datasources Nestoria output Lots of data, many sources, 4 languges ETL, geocoding, deduplication …. HTML, whitelabels, API, widgets, FBML …. All with very few developers Internal tools, reporting, invoicing …
- 5. Developers, not firefighters Bad Good
- 7. Documentation Bad: no documentation Worse: incorrect documentation
- 8. Who do you trust? You make mistakes. Computers don’t.
- 9. >./connect_to_database.pl --help Prints command needed to access database Usage: ./connect_to_database.pl --database [listings|searchindex] --country no default, (de|es|it|uk) --database type of DB --help --product_type default=realestate --type no default, (failover) --verbose Umm, the backup DB is on server 3, right? Don’t guess. Know
- 11. Measure twice, cut once
- 12. my $script = ‘~/somescript.pl’; my $procs = determine_procs(); my $groups = some_test() ? 2 : 3; my $cmd = $script . ’ --groups ’ . $groups . ’ --procs ’ . $procs; system($cmd); Rome is burning. You have 10 seconds. What does this code do?
- 13. my $script = ‘~/somescript.pl’; my $procs = determine_procs(); my $groups = some_test() ? 2 : 3; my $cmd = $script . ’ --groups ’ . $groups . ’ --procs ’ . $procs; execute_cmd($cmd); sub execute_cmd{ my $cmd = shift; if ($dryrun){ print STDERR “would have run $cmd ”; } else { system($cmd); } } Better:
- 16. Get help To: Nestoria team From: [email_address] Subject: Bug I think there is a bug. The page doesn’t seem to wrk. Pls fix.
- 17. Better To: Nestoria team From: [email_address] Subject: Bug I think there is a bug. The page doesn’t seem to wrk. Pls fix. HTTP_X_FORWARDED_FOR 81.136 .*.* SERVER_ADDR 10.10.*.* HTTP_USER_AGENT Mozilla/4.0 (compatible; MSIE 7.0; … Cookie MjEwREhQZ1JzeEl1NDAxMjIzNTY4MjE4A5A
- 18. Get help (cont.)
- 19. Help me to help you
- 20. Shameless plug Join us! You’ll love our API….
- 21. Questions? http://www.nestoria.co.uk http://blog.nestoria.co.uk