cheerfulstoic
Global state on startup
Hey! I’m really enjoying getting into Elixir / Phoenix, but!
In my application, I would like to fetch some configuration from a JSON file when the app starts up and then have that configuration globally available in the Phoenix app. I have a lib module with a function which gets the configuration data and I can call that from my Phoenix application’s ex file, but I’m not sure where to put the result (or even if it’s a good idea). Thoughts?
Thanks,
Brian
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YellowApple
The normal place for this sort of configuration would be
config/config.exsor some other.exsfile loaded by it. In other words, using configuration formats other than just ordinary Elixir code is generally discouraged.That said, if you for some reason absolutely need to accept JSON configuration files specifically, the best place would still probably be something in or around
config/config.exs. You’d probably need to define that function there, then call it with whatever arguments needed to load your JSON config. The resulting map (or whatever internal format used after parsing) could then be assigned to a configuration key for your OTP app.For example (note the anonymous function in a variable; you can probably define a module in here, but whatever):
Last Post!
cheerfulstoic
@YellowApple Thanks! I think I didn’t explain what I was doing well enough. I’ve definitely got some configuration variables in
config/config.exs. They aregithub_tokenandrepo_path. The idea of the app is that it will be able to receive webhooks from GitHub for certain events, so I go to the GitHub repo and get ajsonfile from the root which has configuration for the behaviors on how to handle the webhooks. After your response it occurs to me that I might be able to have the configuration inconfig/config.exs, but my concern was being able to put the configuration into a place / format that it would be easy for anybody to update. Thinking on it further, it actually probably makes sense anyway to get the configuration each time. Part of the plan would also be to pull Markdown files from the repo as well which would contain text which would be used as part of the webhooks. It doesn’t really make sense to store the configuration globally anyway because it should always be using the latest copy.@crusso Thanks, I had read about using processes to store ongoing state, so I might play with that as a solution