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AbsoLUAtion » History » Revision 4

Revision 3 (nitrox, 2008-11-05 16:34) → Revision 4/30 (nitrox, 2008-11-05 16:55)

h1. AbsoLUAtion - The powerful combo of Lighttpd + Lua 

 {{>toc}} 

 *We want to build kind of a central ressource for Lighttpd + Lua as this is one of the biggest advantages Ligtthpd has over other webservers. Its useful, handy, simple and sometimes a quite powerful combo which gives you some additional flexibility and offers you solutions to small and big problems other httpd´s can´t solve!* 

 *Again we hope you - the users of lighty - support this page by contributing links, code-snippets or simply offer your lua-scripts with small descriptions of what it does and how it helps lighty to do stuff you want it to do.* 


 h2. Whats needed for this to work? 

 A [[DevelSubversion|decent]] version of Lighttpd + [[lighttpd:Docs:ModMagnet|mod_magnet]] + Lua (v5.0 or better v5.1, your distro´s should have this) http://www.lua.org 

 h2. How to get it up and running 

 <pre> 
  ./autogen.sh 
  ./configure --your-normal-options-here \ 
  --with-lua=lua #will check for lua or lua5.x on debian 
  ./make 
  ./make check #or VERBOSE=1 make check for detailed results 
  ./make install 
 </pre> 

 h2. Links 

 Link collection (Description -> Link). 

 * Bundle css + js files to save some hits and not break browsers parallel download: "lighttpd+mod_magnet+lua":http://www.cakephp.nu/faster-page-loads-bundle-your-css-and-javascript-lighttpd-mod_magnet-lua 

 h2. Code-Snippets 

 *overwrite default mime-type/content-type* 

 Add "magnet.attract-physical-path-to = ( "/path-to/change-ctype.lua" )" to lighttpd.conf and save the following as "change-ctype.lua" 
 <pre> 
  if (string.match(lighty.env["physical.rel-path"], ".swf")) then 
     lighty.header["Content-Type"] = "text/html" 
 </pre> 


 *simple maintenance script* 

 You need three files, maint.up, maint.down and maint.html. 
 maint.html holds a simple html-page of what you want to display to your users while in maintenance-mode. 

 Add "magnet.attract-physical-path-to = ( "/path-to-your/maint.lua" )" to your lighttpd.conf, best is global section or within a host-section of your config, e.g. a board/forum/wiki you know a maintenance-mode is needed from time to time. If you want to switch to maintenance-mode, just copy maint.down to maint.lua in your "/path-to-your/" location, and lighty will display your maint.html to all users - without restarting anything - this can be done on-the-fly. Work is done and all is up again? Copy maint.up to maint.lua in your "/path-to-your/" location. Whats maint.up doing? Nothing, just going on with normal file serving :-) 

 maint.up - all is up, user will see normal pages 

 <pre> 
 -- This is empty, nothing to do. 
 </pre> 

 maint.down - lighty will show the maintenance page -> maint.html 

 <pre> 
 -- lighty.header["X-Maintenance-Mode"] = "1" 
 -- uncomment the above if you want to add the header 
 lighty.content = { { filename = "/path-to-your/maint.html" } } 
 lighty.header["Content-Type"] = "text/html" 
 return 503 
 -- or return 200 if you want 
 </pre> 

 h2. Small Helpers 

  ... 

 h2. other solutions 

 *external-static* 

 I´ve seen this nice solution somewhere where they host some files locally on their machines. If popularity gets to high, files are too big or for whatever reasons the files are moved to i think it was amazon´s S3 or akamai for faster serving or to cope with high traffic. You still can use your hostname, urls, collect stats from your logs - your users are just redirected with a 302 to the files they ask for. 

   Request -> check for local copy -> 302 (if not stored locally) -> let users download from a big pipe 

 Add the following to your lighttpd.conf: 
 <pre> 
 $HTTP["url"] =~ "^/static/[^/]+[.]gif([?].*)?$" { #match the files you want this to work for 
   magnet.attract-physical-path-to = ( "/path-to-your/external-static.lua" ) 
 } 
 </pre> 

 Save the following to external-static.lua: 
 <pre> 
  local filename = lighty.env["physical.path"] 
  local stat = lighty.stat( filename ) 
   if not stat then 
    local static_name = string.match( filename, "static/([^/]+)$" ) 
    lighty.header["Location"] = "http://<new-location-with-big-pipes>/" .. static_name 
  return 302 
 end  
 </pre>