Configuron

Configuron is a Clojure library for managing hierarchical properties for deployment under different environments.

Sample configs.clj:

{"default" {:max-workers (+ 1 4)
            :temp-dir "/tmp"
            :async? true
            :google-analytics? false
            :aws-key "xxxxx"
            :port 8090}
 "dev" {:temp-dir "c:/temp"}
 "devweb" {:port 5000}
 "devtest" {:async? false}
 "prod" {:google-analytics? true}
 "prodheroku" {:aws-key "yyyyy"}}

Environment hierarchy for the above configs.clj:

         default
         /     \
      dev     prod
     /   \        \
devweb  devtest  prodheroku

Properties are picked in this order of precedence:

1. environment variables
2. Leiningen project map
3. concrete environment "prodheroku" (in configs.clj)
4. abstract environment "prod" (in configs.clj)
5. "default" (in configs.clj)

The environment name being used (e.g. "prodherouku") must be specified either as an environment variable (ENV_NAME) or in the Leiningen project map under key :env-name.

If you want to be able to draw settings from the Leiningen project map, you'll need the following plugin and hook:

:plugins [[environ/environ.lein "0.3.0"]]
:hooks [environ.leiningen.hooks]

Installation

Include the following dependency in your project.clj file:

:dependencies [[configuron "0.1.0"]]

Usage

1. create and populate resources/configs.clj

2. add resources dir in classpath in project.clj

   :resource-paths ["resources"]

3. specify environment name as environment variable

   export ENV_NAME="devweb"

   or in the Leiningen project map in project.clj

   :profiles {:devweb {:env {:env-name "devweb"}}}

4. if specifying environment name in Leiningen project map, launch with corresponding profile

   lein with-profile devweb ring server

License

Copyright © 2013 David Lin

Distributed under the Eclipse Public License, the same as Clojure.