Envlet
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Envlet for Rust

One small crate. inject fills the process environment, load and get return values, all with typed errors.

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Inject
use envlet::{inject, Error, Options};

fn main() -> Result<(), Error> {
    inject(&Options::default())?;

    let stripe_key = std::env::var("STRIPE_KEY").unwrap();
    Ok(())
}
Load
use envlet::{load, Error, Options};

fn main() -> Result<(), Error> {
    let values = load(&Options::default())?;

    let database_url = &values["DATABASE_URL"];
    Ok(())
}
Get
use envlet::{get, Error, Options};

fn main() -> Result<(), Error> {
    let stripe_key = get("STRIPE_KEY", &Options::default())?;
    Ok(())
}
Install
cargo add envlet

Set up

  1. 01

    Install

    cargo add envlet.

  2. 02

    Set one secret

    ENVLET_TOKEN in the environment of the binary.

  3. 03

    Inject in main

    Call inject(&Options::default())? before reading std::env.

Questions

Will my app start if Envlet is down?
No, and that is the point. The SDK retries for a few seconds, then fails so you notice. It never starts your app with half an environment.
What does the host need?
One variable, ENVLET_TOKEN. Everything else arrives at boot.
Can I still set some values on the Rust host?
Yes. A value the host already set wins. Pass override if you want Envlet to win instead.

Also for

Stop pasting .env files.

One command. The right values for whoever runs it.

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