Compiled Websites with Plone, Django, Xapian and SSI

Compiled Websites with Plone, Django and SSI Łukasz Langa" " Wojciech Lichota"

Agenda   Reasoning   Plone and Static Deployment   Django and SSI   Search (Xapian)

  Security solutions requiring 100% guarantee that the content cannot be edited from the Web Reasoning   Performance The Problem dynamic Websites are resource hungry   Quality Assurance the ability to review complete content and functionality before every deployment

  Security front-end/back-end division two-level authentication Reasoning   Performance throwing hardware at the Existing Approaches problem caching   Quality Assurance dedicated workflow environments test instances

Reasoning The Solution Website compilation

  Convert all Website resources to static files   HTML   CSS   JS The Solution   attachments Static Deployment   media   Deploy the HTML on a traditional Web server ✓  orders of magnitude better performance ✓  incredibly simple scalability ✓  server-agnostic quality assurance

  Examples:   HTTrack   wget -‐-‐mirror Static Deployment ✓  out-of-the-box solution with external tools ✗  weak control of output ✗  slow

  Solutions for Plone:   enpraxis.staticsite   stxnext.staticdeployment Static ✓  much faster than external Deployment solutions with internal tools ✓  fully configurable ✓  easy to customize ✗  needs integration with website

  Open-Source (ZPL)   two parts of configuration Static   basic: for content editors   advanced: for Deployment administrators stxnext.staticdeployment   incremental   content transformations   pluggable   integration with Xapian

stxnext.staticdeployment

  User profiles   Commenting Static   User communication Deployment   Search ...too static! We need something more sophisticated!

  Plone + Static Deployment The Solution   Django for:   User profiles   Commenting   User communication   Xapian for search Compiled Website

How to glue components together? The Solution   client-side approach: JavaScript ✓  simple implementation ✗  many requests ✗  page flickering   server-side approach: Apache SSI ✓  single request ✓  transparent to the user Compiled Website ✗  skin customization

  HTML preprocessor provided by Apache httpd at least since version 1.3   Processing controlled by The Glue SGML comments   Basically enables: Apache mod_include (SSI)   conditional text   inclusion of other files   inclusion of programs   printing/setting environment variables

  A basic SSI element: Apache mod_include <!-‐-‐#element attribute=value attribute=value ... -‐-‐> no whitespace   Typical elements:   #include   #echo   #exec   #set   #if / #elif / #else / #endif

  Enabling SSI in the server configuration: Apache mod_include ... LoadModule include_module modules/mod_include.so ... AddType text/html .html AddOutputFilter INCLUDES .html ... Options +Includes   Examples of basic directives:   current date on the server <!-‐-‐#echo var="DATE_LOCAL" -‐-‐>   file modification date Last modified: <!-‐-‐#flastmod file="index.html" -‐-‐>   inclusion of results from a dynamic application <!-‐-‐#include virtual="/app-‐comments/thread/3/" -‐-‐>   executing local commands <!-‐-‐#exec cmd="uptime" -‐-‐>

  Inclusion of results from a dynamic application <!-‐-‐#include virtual="/app-‐comments/thread/3/" -‐-‐> Apache mod_include   How to specify an external application to be available from /app-‐comments ? RewriteEngine on RewriteRule ^/app-‐comments/(.*)$ http://localhost:8686/$1 [L,P]   What if the external application is not available?   Apache includes the following message by default: [an error occurred while processing this directive]   This can be customized in server configuration by: SSIErrorMsg "<!-‐-‐ Error -‐-‐>”   The default message can be overriden in HTML by: <!-‐-‐#config errmsg=”Custom message" -‐-‐>

  context-specific arguments need to be GET params   by default Django uses URL parts Gotchas   redirect after POST requests Gluing Django with SSI   POST requests cannot render anything   form validation requires additional plumbing   Website templating in two places   Plone skin   Django templates

  Apache is slow... Gotchas Apache httpd

  Apache is slow... NOT!   mpm_prefork is evil   use mpm_worker   any experience with mpm_event? Gotchas   Advantages of Apache: Apache httpd   largest install base   maturity measured in years   the best WSGI module available (mod_wsgi)

  python-‐xapian binding   Ranked search What about   Suggests spelling corrections search?   no Polish stemming Xapian with SSI

Compiled Websites Starring Łukasz Langa" lukasz.langa.pl lukasz@langa.pl @llanga "

Compiled Websites Starring Wojciech Lichota www.lichota.pl wojciech@lichota.pl @wlichota "

Compiled Websites Guest Starring Django Pony www.djangopony.com @djangopony "

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Compiled Websites with Plone, Django, Xapian and SSI

by Wojciech Lichota on Nov 08, 2009

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