you learn something new every day - today lua patterns

Posted: February 26th, by darix

Ok, you could have thought that ”/drupal-5.1” might cause trouble. Sadly it does. The ”-” is a special char for lua patterns. (for more see chapter 5.4.1 of the lua docs)

So i visited my friends at #lua on freenode. After a few minutes of discussion with rici and prec, we got a new drupal.lua. It no longer uses patterns but a simple substring function. And now we happily work with ”/drupal-5.1” aswell.

The details

Why did it fail in first place?


-- prefix without the trailing slash
local prefix = "/drupal-5.1"

and later we did:


request_uri = string.gsub(lighty.env["uri.path"], prefix .. "/(.+)", "%1")

We pass an unescaped string to the pattern match. Especially the ”-” was causing trouble here. Of course there would have been the option to quote all the special chars properly with ”%”. But thats more work than what is really needed. Rici and prec suggest do add a removePrefix function based on string.sub


function removePrefix(str, prefix)
  return str:sub(1,#prefix+1) == prefix.."/" and str:sub(#prefix+2)
end
-- calculate the relevant part of the request_uri
request_uri = removePrefix(lighty.env["uri.path"], prefix)

Last but not least rici suggest a small optimization to the query string construction. From the old ugly …


-- make sure the request_uri is not empty.
if (string.gmatch(request_uri, ".+")) then
  if lighty.env["uri.query"] then
      lighty.env["uri.query"] = lighty.env["uri.query"] .. "&q=" .. request_uri
  else
      lighty.env["uri.query"] = "q=" .. request_uri
  end
end

... we come to the new and shiny …


local uriquery = lighty.env["uri.query"] or "" 
lighty.env["uri.query"] = uriquery .. (uriquery ~= "" and "&" or "") .. "q=" .. request_uri

You learn something new every day.

morphir

try this prefix, it does not care what the name of the directory is. drupal-whatevah

local prefix = lighty.env[“uri.path”]:match”^(/[/]+)/”

konsumer

I discovered the joy of evhost combined with magnet to make a nice automatic system that I setup. I thought would share here, because it seems to relate, and it just made dev-host management super-simple. I set prefix to ’’ in drupal.lua and added this to my config:

server.modules += ( "mod_evhost" ) server.modules += ( "mod_magnet" )</p> <p>$HTTP["host"] =~ "^.+.jetboystudio.com$" { evhost.path-pattern = "/var/vhosts/%3.%2/" index-file.names = ( "index.php" ) magnet.attract-physical-path-to = ( "/etc/lighttpd/drupal.lua" ) }

Now anything.jetboystudio.com points to /var/vhosts/anything.jetboystudio/ and works with clean URLs. Sym-links can be made to multi-multisite setups (like if some of your *.jetboystudio.com hosts needed to be drupal6 and some need to be drupal 5, but otherwise they should share roots, for easy updates)

James

Hi .. can someone with expertise in lighty rules please help..I am using Drupal CMS on a LLMP stack and I am stuck on trying

to come up with rules for a particular module I am wanting to use.

In lighttpd.conf I have:

$HTTP[“host”] =~ “(^{|.)mydomain.com” {
server.document-root = ”/var/www/public_html/mydomain.com/”
index-file.names = ( “index.php” )}

for clean urls

magnet.attract-physical-path-to = (”/etc/lighttpd/rewrite_drupal.lua”) }

In rewrite_drupal.lua I have:

—little helper function function file_exists(path) local attr = lighty.stat(path) if (attr) then return true else return false end end function removePrefix(str, prefix) return str:sub(1,#prefix+1) == prefix..”/” and str:sub(#prefix+2) end

—prefix without the trailing slash

—If reverting back to production mode comment in the above line and uncomment the line below

local prefix = ’’

—the magic ;) if (not file_exists(lighty.env[“physical.path”])) then —file still missing. pass it to the fastcgi backend request_uri = removePrefix(lighty.env[“uri.path”], prefix) if request_uri then lighty.env[“uri.path”] = prefix .. ”/index.php” local uriquery = lighty.env[“uri.query”] or ”” lighty.env[“uri.query”] = uriquery .. (uriquery ~= ”” and ”&” or ””) .. “q=” .. request_uri lighty.env[“physical.rel-path”] = lighty.env[“uri.path”] lighty.env[“request.orig-uri”] = lighty.env[“request.uri”] lighty.env[“physical.path”] = lighty.env[“physical.doc-root”] .. lighty.env[“physical.rel-path”] end end —fallthrough will put it back into the lighty request loop —that means we get the 304 handling for free. ;)

Given the above here is my question :

I want to know how to enable the following rules for a drupal module called “boost” which tries to serve cached html pages bypassing php/drupal and the database. There is a write-up on this at: http://codesorcery.net/2007/07/23/boost-your-drupal-site

Now for this Drupal module to work, there are rewrite rules needed. Currently the module author has noly provided htaccess rules for Apache. I need lighttpd rules. I have pasted above the rules I currently have in lighttpd.conf and rewrite_drupal.lua file. Can someone pls help me with the rules to add to the lua or the lighttpd.conf file to make this module work.

I am pasting below the htaccess rules specific to this module that the author is recommending. If anyone has any suggestions on how it can work with lighttpd that would be a big help.

# Apache htaccess Rewrite rules for static page caching provided by the Boost module: # BOOST START <ifmodule> Header add Expires “Sun, 19 Nov 1978 05:00:00 GMT” Header add Cache-Control “no-store, no-cache, must-revalidate, post-check=0, pre-check=0” </ifmodule> <ifmodule> AddCharset utf-8 .html </ifmodule> RewriteCond %{REQUEST_METHOD} ^GET$ RewriteCond %{REQUEST_URI} ^/$ RewriteCond %{QUERY_STRING} ^$ RewriteCond %{HTTPCOOKIE} !DRUPALUID RewriteCond /cache/{SERVERNAME}/0/index.html -f RewriteRule ^(.)$ cache/%{SERVER_NAME}/0/index.html [L] RewriteCond %{REQUEST_METHOD} ^GET$ RewriteCond %{REQUEST_URI} !/cache RewriteCond %{REQUEST_URI} !^{/user/login
RewriteCond %{REQUEST_URI} !}/admin RewriteCond %{QUERY_STRING} ^{$
RewriteCond %{HTTPCOOKIE} !DRUPALUID
RewriteCond /cache/{SERVERNAME}/0%{REQUEST_URI} -d
RewriteCond /cache/{SERVERNAME}/0%{REQUEST_URI}/index.html -f
RewriteRule ^(.})$ cache/%{SERVER_NAME}/0/$1/index.html [L] RewriteCond %{REQUEST_METHOD} ^GET$ RewriteCond %{REQUEST_URI} !/cache RewriteCond %{REQUEST_URI} !^{/user/login
RewriteCond %{REQUEST_URI} !}/admin RewriteCond %{QUERY_STRING} ^$ RewriteCond %{HTTPCOOKIE} !DRUPALUID RewriteCond /cache/{SERVERNAME}/0%{REQUEST_URI}.html -f RewriteRule ^(.)$ cache/%{SERVER_NAME}/0/$1.html [L] # BOOST END

# Rewrite current-style URLs of the form ‘index.php?q=x’. RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.)$ index.php?q=$1 [L,QSA] </ifmodule>