This Q came up on the Leiningen list but I wanted to share my answer
on the larger Clojure group to get feedback from a bigger pool...
On Mon, Nov 1, 2010 at 8:40 PM, Shantanu Kumar <kumar.shant...@gmail.com> wrote:
> There are some resource files (e.g. dbconfig.properties) I need to
> include in code so that they are on the classpath. However, they need
> to vary during dev/testing and production -- I will have different
> versions of dbconfig.properties during dev/testing and production. I
> want to know what is the recommended way to include/specify them so
> that they are on the classpath based on he profile (dev, testing,
> production, staging etc.) I am referring to.
FWIW, I've just implemented a system for this which uses a map of maps
for configuration and the server's hostname to pick an entry from the
environment settings. This is pretty much how I implement it on every
project I build (in other languages).
The default is 'development'. The settings are dynamically switched at
application startup based on the hostname. This allows a single
codebase to be used on every server and means I don't have to worry
about property files or some such. If you still want per-machine
deployment files, you can of course have the environments.clj file
dropped in on each machine (equivalent to your dbconfig.properties).
I can provide more detail if you'd like but I'll need to do some
serious editing since it's fairly specific to our servers /
infrastructure :)
Here's a taste of the environments.clj file:
(def project-environments
[
{ :name "development-charlie" :hostnames [ "charlieg" ] :settings
{ :email "char...@domain.com"
:dbPassword "mysecret" }}
{ :name "development-sean" :hostnames [ "Sean-Corfields"
"scorfield" ] :settings
{ :email "s...@corfield.org"
:dbPassword "special" }}
... ])
We have an additional wrinkle in that some servers have multiple
environments on them in different webroots so our matching code is a
little more complex than it would otherwise be based on just the
hostname. Here's a taste of the matching code:
(defn match-any-host [h n w wp]
(and (match-web-root w wp)
(if (empty? n)
true
(some #(match-a-host h %) n))))
(defn find-host [s h w]
(let [m (first (filter #(match-any-host h (% :hostnames) w (% :webroot)) s))]
(if m
(do (println (str "Environment " (m :name) " selected."))
m)
(do (println "Environment development defaulted")
{:name "development" :settings {}}))))
(defn settings [d h]
(merge d (h :settings)))
(def my-host (find-host worldsingles-environments (hostname) (webroot)))
(def my-settings
(settings worldsingles-config my-host))
Hope that's useful...
--
Sean A Corfield -- (904) 302-SEAN
Railo Technologies, Inc. -- http://getrailo.com/
An Architect's View -- http://corfield.org/
"If you're not annoying somebody, you're not really alive."
-- Margaret Atwood
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