177 lines
5.1 KiB
Markdown
177 lines
5.1 KiB
Markdown
# itconfig
|
||
[](https://travis-ci.org/icetemple/itconfig-rs)
|
||
[](https://docs.rs/itconfig)
|
||
[](https://crates.io/crates/itconfig)
|
||
[](https://gitter.im/icetemple/itconfig-rs?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
|
||
|
||
Easy build a configs from environment variables and use it in globally.
|
||
|
||
We recommend you start with the [documentation].
|
||
|
||
|
||
## Motivation
|
||
|
||
I began to use rust with web programming experience where environment variables are widely used
|
||
and often there are more then 50 of them. First I looked at already created libraries.
|
||
But there it's necessary to initialise structure that needs to be moved to each function
|
||
where you need variable. It uses little bit memory, but configuration lifetime is as long
|
||
as application lifetime. Because of it I decided to create my own library.
|
||
|
||
|
||
## Installation
|
||
|
||
These macros require a Rust compiler version 1.31 or newer.
|
||
|
||
Add `itconfig = { version = "1.0", features = ["macro"] }` as a dependency in `Cargo.toml`.
|
||
|
||
`Cargo.toml` example:
|
||
|
||
```toml
|
||
[package]
|
||
name = "my-crate"
|
||
version = "0.1.0"
|
||
authors = ["Me <user@rust-lang.org>"]
|
||
|
||
[dependencies]
|
||
itconfig = { version = "1.0", features = ["macro"] }
|
||
```
|
||
|
||
|
||
## Example usage
|
||
|
||
```rust
|
||
use itconfig::config;
|
||
use std::env;
|
||
//use dotenv::dotenv;
|
||
|
||
config! {
|
||
DEBUG: bool => false,
|
||
|
||
#[env_name = "APP_HOST"]
|
||
HOST: String => "127.0.0.1",
|
||
|
||
DATABASE_URL < (
|
||
"postgres://",
|
||
POSTGRES_USERNAME => "user",
|
||
":",
|
||
POSTGRES_PASSWORD => "pass",
|
||
"@",
|
||
POSTGRES_HOST => "localhost:5432",
|
||
"/",
|
||
POSTGRES_DB => "test",
|
||
),
|
||
|
||
APP {
|
||
static BASE_URL => "/api", // &'static str by default
|
||
|
||
ARTICLE {
|
||
static PER_PAGE: u32 => 15,
|
||
}
|
||
|
||
#[cfg(feature = "companies")]
|
||
COMPANY {
|
||
#[env_name = "INSTITUTIONS_PER_PAGE"]
|
||
static PER_PAGE: u32 => 15,
|
||
}
|
||
}
|
||
|
||
FEATURE {
|
||
NEW_MENU: bool => false,
|
||
|
||
COMPANY {
|
||
PROFILE: bool => false,
|
||
}
|
||
}
|
||
}
|
||
|
||
fn main () {
|
||
// dotenv().ok();
|
||
env::set_var("FEATURE_NEW_MENU", "t");
|
||
|
||
config::init();
|
||
assert_eq!(config::HOST(), String::from("127.0.0.1"));
|
||
assert_eq!(config::DATABASE_URL(), String::from("postgres://user:pass@localhost:5432/test"));
|
||
assert_eq!(config::APP:ARTICLE:PER_PAGE(), 15);
|
||
assert_eq!(config::FEATURE::NEW_MENU(), true);
|
||
}
|
||
```
|
||
|
||
|
||
Macro is an optional feature, enabled by default. You can install itconfig without default
|
||
features and use this lib as shown below
|
||
|
||
```rust
|
||
use itconfig::*;
|
||
use std::env;
|
||
// use dotenv::dotenv;
|
||
|
||
fn main() {
|
||
env::set_var("DATABASE_URL", "postgres://127.0.0.1:5432/test");
|
||
|
||
let database_url = get_env::<String>("DATABASE_URL").unwrap();
|
||
let new_profile: bool = get_env_or_default("FEATURE_NEW_PROFILE", false);
|
||
let articles_per_page: u32 = get_env_or_set_default("ARTICLES_PER_PAGE", 10);
|
||
}
|
||
```
|
||
|
||
## Running tests
|
||
|
||
```bash
|
||
cargo test
|
||
```
|
||
|
||
|
||
## Roadmap
|
||
|
||
* [x] Add namespace for variables
|
||
* [x] Custom env name
|
||
* [x] Support feature config and other meta directives
|
||
* [x] Add default value to env if env is not found
|
||
* [x] Concat env variables to one variable
|
||
* [x] Add nested namespaces
|
||
* [x] Support meta for namespaces
|
||
* [x] Support array type
|
||
* [x] Rewrite to proc macro
|
||
* [ ] Support hashmap type
|
||
* [ ] Support custom env type
|
||
* [ ] Common configuration for namespace variables
|
||
|
||
|
||
## Available features
|
||
|
||
* **default** - ["macro", "primitives", "static"]
|
||
* **macro** - Activates `config!` macros for easy configure web application.
|
||
* **array** - Add EnvString impl for vector type (uses optional `serde_json` package).
|
||
* **primitives** - Group for features: `numbers` and `bool`.
|
||
* **numbers** - Group for features: `int`, `uint` and `float`.
|
||
* **int** - Group for features: `i8`, `i16`, `i32`, `i64`, `i128` and `isize`.
|
||
* **uint** - Group for features: `u8`, `u16`, `u32`, `u64`, `u128` and `usize`.
|
||
* **float** - Group for features: `f32` and `f64`
|
||
* **i8** - impl EnvString for i8 type
|
||
* **i16** - impl EnvString for i16 type
|
||
* **i32** - impl EnvString for i32 type
|
||
* **i64** - impl EnvString for i64 type
|
||
* **i128** - impl EnvString for i128 type
|
||
* **isize** - impl EnvString for isize type
|
||
* **u8** - impl EnvString for u8 type
|
||
* **u16** - impl EnvString for u16 type
|
||
* **u32** - impl EnvString for u32 type
|
||
* **u64** - impl EnvString for u64 type
|
||
* **u128** - impl EnvString for u128 type
|
||
* **usize** - impl EnvString for usize type
|
||
* **f32** - impl EnvString for f32 type
|
||
* **f64** - impl EnvString for f64 type
|
||
* **bool** - impl EnvString for bool type
|
||
|
||
## License
|
||
|
||
[MIT] © [Ice Temple](https://github.com/icetemple)
|
||
|
||
|
||
## Contributors
|
||
|
||
[pleshevskiy](https://github.com/pleshevskiy) (Dmitriy Pleshevskiy) – creator, maintainer.
|
||
|
||
|
||
[documentation]: https://docs.rs/itconfig
|
||
[MIT]: https://github.com/icetemple/itconfig-rs/blob/master/LICENSE
|