app.conf和环境变量旁边的外部配置，用于revel go框架

Question

I have read revel app.conf manual for custom configuration and environment variables. however I couldn't find way to use additional external configuration along with app.conf.

My goal is to achieve external configuration file in addition to internal app.conf. Let's say creating a product called example and example product maintains it's sensible defaults with app.conf (not exposing to end user) instead product exposes config attributes via example.conf (default location could be /etc/example/example.conf) for product users.

For example: http config field from app.conf

http.addr =
http.port = 9000

extend it to example.conf

http.addr =
http.port = 9000

[database]
host = "localhost"
port = 8080
user = "username"
password = "password"
# etc...

Then I read example.conf during an application start use values also apply values on top of app.conf (overriding). Finally revel server starts!

How to achieve this goal with revel go framework?

Answer 1

It appears you are working against the design of the app.conf. It is already setup to be sectioned, for example all this is in a single app.conf file

[dev]
results.pretty = true
watch = true
http.addr = 192.168.1.2

[test]
results.pretty = true
watch = true
http.addr = 192.168.1.22

[prod]
results.pretty = false
watch = false
http.addr = 192.168.1.100

you can launch 3 different scenarios by using three different command line options

revel run bitbucket.org/mycorp/my-app dev

revel run bitbucket.org/mycorp/my-app test

revel run bitbucket.org/mycorp/my-app prod

I know this is not exactly what your goal is but you can acheive a similar result.