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Esteemed Monks,

We support some fairly complex web applications and lately we're running into some issues with our config infrastructure. I got some help recently when I asked What config info belongs where for web apps?; thanks to those who responded.

Now I'm trying to define a better config system, but I can't find any best practices or guidelines beyond simple config file processing.

Here are my needs:

  • be able to load shared config info that is machine-specific but relevant across many apps (e.g., directory prefixes, current environment (dev, prod), current server name, etc.). Would like to be able to pass in a project name to allow some automatic customization of directory paths;
  • be able to load app-specific info, and use variables from the shared info to do it (e.g., use a path from the shared info to tell me where to find my app-specific config file on a given system);
  • load 'session scoped' info appropriately with a layer of abstraction so apps aren't directly using $ENV{REMOTE_USER}; I want a layer because depending on the auth system we use, the current username might be in REMOTE_USER or SOME_OTHER_ENV and I'd like to abstract that from direct use by apps.
  • do all of this in a cgi and mod_perl safe way so we can have just one way to do it;

Here's a draft of a best practice (untested), with many questions:

### Shared config info -- "machine scope" ### # A local module that loads the shared config info. # Is there a way to pass in a project name in a 'use' # that is mod_perl safe? use My::LocalConfig qw(project_name); ### App-specific config info -- "machine scope" ### # Assuming 'config_path' is a function exported by the LocalConfig mod +ule. # Or should it just set a variable? # What sort of variable and where can it be set so it's ready when # the require runs? # Would a 'do' be better? # Should the project_name be passed in here as a parameter? require config_path . "/my_config.pl"; # Or should we use a Config module here? # Do various config modules allow a function call when you set # the path? # Are there Config modules that allow some logic in them? # We have several cases where we set # variables differently based on dev, QA, or prod environments. ### Session config info -- "session scope" ### # A module that just grabs relevant $ENV info and # provides it via a method or methods. use My::SessionConfig; # then my $session = My::SessionConfig->new(); my $current_userid = $session->current_user();

What are you doing for your config environment?

Do you have custom modules to handle all of this?

Once I nail down the best practice or a functioning system, I'd like to follow some of TheDamian's advice and hide a bunch of this to make it easier to use. But we've already been burned by some cleverness in our mod_perl environment, so I'll want to be careful.


In reply to Configuration Best Practices for Web Apps by cbrandtbuffalo

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