Revel uses app.conf for storing configuration. I want my configuration to get value from environment variable using os.Getenv(key)
How can I do it? Should I use revel.Config to make changes? if so where do I place it?
Or is there another way?
I use it mainly for storing database information (I don't want to enter my credential in configuration files)
Thank you
Revel uses revel/config for managing app.conf.
And the only place revel/config foes read from the environment variable is in type.go (c *Config) String() method.
// $ environment variables
computedVal, _ = c.computeVar(&value, envVarRegExp, 2, 1, func(varName *string) string {
return os.Getenv(*varName)
})
That means you could add in a config file values based on the name of environment variable, which would allow you to use said environment variable to modify the config.
See an example in the revel/config REAMD.md file.
[DEFAULT]
host: www.example.com
protocol: http://
base-url: %(protocol)s%(host)s <====
The OP pveyes points out to this comment in type.go:
// substitute by new value and take off leading '%(' and trailing ')s'
// %(foo)s => headsz=2, tailsz=2
// ${foo} => headsz=2, tailsz=1
So:
- when using environment variables use
${ENV_VARS}, and- for unfolding variables use
%(UNF_VARS)s