Faster Web Applications with SCGI
Once you're comfortable writing programs using SCGI, you may want to try adapting existing applications to use it. Some well-known Web applications, such as MoinMoin (a wiki) and Trac (a wiki-based collaborative development environment), are implemented as Python modules. Both of these examples come with CGI scripts in Python that can be called from Apache. The CGI scripts are very short; they really don't do anything except import the application's modules and invoke a function on them.
If you find an application like that, all you really need to do to make it work with SCGI is take that little bit of Python code and move it into a produce() method, as in the examples you've seen here. If you have SCGI 1.12 or newer, you also might want to take a look at an alternative SCGIHandler method, produce_cgilike().
That's about all we have room for. If you wonder about how the CGI parameters work, try looking at the CGI standard, which calls them “request meta-variables” (see Resources).
Finally, a word of warning. You'll notice that the last example program dies horribly if you fail to pass the expected arguments. The SCGI server replaces the failing processes, so in this case, there's no real problem. But, this should remind you how careful you need to be when writing Web applications. Never trust the input you receive from outside! If a program can be crashed, someone can probably subvert it or take it out of action. People all over the world do that sort of thing for fun or profit, so take the risk seriously.
SCGI Downloads: quixote.python.ca/releases
SCGI Home Page: www.mems-exchange.org/software/scgi
CGI Standard: ftp.rfc-editor.org/in-notes/rfc3875.txt
More on SCGI with Python and Apache2: thaiopensource.org/development/suriyan/wiki/UsingScgi
Perl Interface: search.cpan.org/~vipercode/SCGI/lib/SCGI.pm
Lisp Interface: randallsquared.com/download/scgi
Jeroen Vermeulen works for the Open Source Department of the Thai Software Industry Promotion Agency. He's currently working on Suriyan, a server system for those who don't have time for server systems.
|Using Salt Stack and Vagrant for Drupal Development||May 20, 2013|
|Making Linux and Android Get Along (It's Not as Hard as It Sounds)||May 16, 2013|
|Drupal Is a Framework: Why Everyone Needs to Understand This||May 15, 2013|
|Home, My Backup Data Center||May 13, 2013|
|Non-Linux FOSS: Seashore||May 10, 2013|
|Trying to Tame the Tablet||May 08, 2013|
- Using Salt Stack and Vagrant for Drupal Development
- Making Linux and Android Get Along (It's Not as Hard as It Sounds)
- New Products
- Validate an E-Mail Address with PHP, the Right Way
- Drupal Is a Framework: Why Everyone Needs to Understand This
- A Topic for Discussion - Open Source Feature-Richness?
- The Pari Package On Linux
- New Products
- Home, My Backup Data Center
- New Products
- This is the easiest tutorial
3 hours 41 min ago
- Ahh, the Koolaid.
9 hours 20 min ago
- git-annex assistant
15 hours 19 min ago
- direct cable connection
15 hours 42 min ago
- Agreed on AirDroid. With my
15 hours 52 min ago
- I just learned this
15 hours 56 min ago
16 hours 26 min ago
- not living upto the mobile revolution
19 hours 17 min ago
- Deceptive Advertising and
19 hours 53 min ago
- Let\'s declare that you have
19 hours 54 min ago
Enter to Win an Adafruit Prototyping Pi Plate Kit for Raspberry Pi
It's Raspberry Pi month at Linux Journal. Each week in May, Adafruit will be giving away a Pi-related prize to a lucky, randomly drawn LJ reader. Winners will be announced weekly.
Fill out the fields below to enter to win this week's prize-- a Prototyping Pi Plate Kit for Raspberry Pi.
Congratulations to our winners so far:
- 5-8-13, Pi Starter Pack: Jack Davis
- 5-15-13, Pi Model B 512MB RAM: Patrick Dunn
- Next winner announced on 5-21-13!
Free Webinar: Linux Backup and Recovery
Most companies incorporate backup procedures for critical data, which can be restored quickly if a loss occurs. However, fewer companies are prepared for catastrophic system failures, in which they lose all data, the entire operating system, applications, settings, patches and more, reducing their system(s) to “bare metal.” After all, before data can be restored to a system, there must be a system to restore it to.
In this one hour webinar, learn how to enhance your existing backup strategies for better disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible bare-metal recovery solution for UNIX and Linux systems.