Erlang White Label
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The document is a personal note from Geoff Cant detailing his experiences and projects related to Erlang, particularly in debugging ejabberd and working with various web frameworks. It highlights various technical challenges he's faced, including DNS documentation issues and performance optimizations using tools like YSlow. Geoff also expresses a need for collaboration and assistance with his numerous GitHub projects.
Erlang White Label
- 1. WhiteLabel Erlang Adventures in the undocumented wilds of inet_dns
- 2. Who is this guy? Geoff Cant <nem@erlang.geek.nz> Current (xmpp|mailto): gcant@process-one.net Previously geoff@catalyst.net.nz archaelus on http:// github, irc:freenode/ #erlang
- 5. What have I been up to? ejabberd debugging virtual hosting debugging large clusters porting patches debugging patches
- 6. What have I been up to? Whitelabel ejabberd hosting
- 7. A rant in four parts Web Frameworks (why Mochiweb) Other libraries (ejango, esmtp, erlydtl) DNS (OTP Undocumented) Tricks and Lessons
- 8. Web Frameworks Erlyweb YAWS inets The Erlang Web Nitrogen
- 9. Mochiweb. (No logo, ‘cause they’re too busy coding)
- 10. Other pieces Templating URL Routing Form validation Email
- 11. Templating erlydtl Templates compile to modules Well known template syntax (Django-ish) Template
- 12. URL Routing Must work with RESTful URLs Must be reversible - able to generate URLs too ejango.url_routes
- 14. Form Validation Generate forms and validate form posts Couldn’t find anything available already Declarative DSL for form specification ejango.form, ejango.form_validator
- 16. Sending Email smtp_fsm Erlware smtp No attachments? This should be much easier. esmtp
- 17. Mail Sending API
- 19. DNS Need to verify ownership of domain Need to add XMPP SRV records inet:gethostbyname ... To the githubs!
- 21. DNS Undocumented inet_res:getbyname/2 inet_res:nnslookup/5 inet_db - caching inet_dns - packet encoding/decoding, bugs ‘dns’ -- the way forward.
- 22. Here be Dragons. Sometimes it’s undocumented for a reason The TXT RR is subtle. I reimplemented the same bug.
- 23. My DNS decoder TXT RRs are <<Len:8, Data:Len/binary>>* Binary pattern matching rocks
- 24. Whitelabel Tricks Check SOA to test if domain exists Bypass DNS caching
- 25. YSlow Optimisations Initially got a D on my YSlow report Decided to gzip and minify content, move js blocks around ejango.static:compress_docroot/1, ejango.static:serve_compressed/3
- 26. Minifying...
- 27. Lessons Hierarchal modules are a world of hurt. Metaprogramming in Erlang is still too hard. Never trust ADSL routers. ...
- 28. Use Github.
- 29. A small plea for help I have way too many github projects Adopt my code? Interested in collaborating?
- 30. Fin.