heroku-buildpack-rust VS config-rs

rocket: 0.5.0-rc.2 diesel: 1.4.4 nightly: in the latest version Heroku Buildpack: https://github.com/emk/heroku-buildpack-rust Also I am using a rust-toolchain file.

I am using this buildpack: https://github.com/emk/heroku-buildpack-rust

You just need to add a Procfile and a buildpack. Just follow the instructions there.

All you have to do is run a binary, so it's pretty easy. And if the service lets you install rustup you can just cargo run as you normally would. For a real example, check out the Heroku buildpack for Rocket.

Use Heroku's Rust buildpack.

I like config.rs, but I am struggling to overwrite config profiles with environment variables. The desired config is mixed, like .toml

Consider config crate. It could be like:

I've been using Config most of the time. I also use once_cell to make it a static variable.

I've enjoyed using this one: https://crates.io/crates/config

Anyone know of a library like https://github.com/netflix/go-env but for rust? I found https://github.com/mehcode/config-rs but it's just not as simple...

I was just in that space today. The config crate has an example you might find useful: https://github.com/mehcode/config-rs/tree/master/examples/hierarchical-env

How it differs from config?

Checking an environment variable is very easy with std::env::var or similar. If you have other bits of configuration that also change—which is typical; things like DB connection strings—you may consider a more full-featured solution like https://docs.rs/config/0.10.1/config/ (pay particular attention to this example, which seems to be very close to what you want: https://github.com/mehcode/config-rs/blob/master/examples/hierarchical-env/src/settings.rs ).

It's unfortunate, it looks like there was an attempt to get someone else to maintain it here, but no one ended up really stepping up to the plate.