158 lines
4.6 KiB
Markdown
158 lines
4.6 KiB
Markdown
# itconfig
|
||
|
||
[](https://travis-ci.org/icetemple/itconfig-rs)
|
||
[](https://github.com/rust-secure-code/safety-dance/)
|
||
[](https://docs.rs/itconfig)
|
||
[](https://crates.io/crates/itconfig)
|
||
|
||
|
||
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"] }
|
||
```
|
||
|
||
## Basic 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",
|
||
),
|
||
|
||
pool {
|
||
MAX_SIZE: usize => 15,
|
||
},
|
||
},
|
||
|
||
sentry {
|
||
DSN: Option<&'static str>,
|
||
},
|
||
|
||
feature {
|
||
static CORS: bool => false,
|
||
|
||
static GRAPHQL_PLAYGROUND: bool => false,
|
||
},
|
||
}
|
||
|
||
fn main () {
|
||
// dotenv().expect("dotenv setup to be successful");
|
||
// or
|
||
env::set_var("FEATURE_CORS", "true");
|
||
|
||
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::database::pool::MAX_SIZE(), 15);
|
||
assert_eq!(config::sentry::DSN(), None);
|
||
assert_eq!(config::feature::CORS(), true);
|
||
}
|
||
```
|
||
|
||
Macro is an optional feature, disabled by default. You can use this library
|
||
without macro
|
||
|
||
```rust
|
||
use itconfig::*;
|
||
use std::env;
|
||
// use dotenv::dotenv;
|
||
|
||
fn main() {
|
||
// dotenv().expect("dotenv setup to be successful");
|
||
// or
|
||
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 --all-features
|
||
```
|
||
|
||
## Available features
|
||
|
||
- **default** - ["primitives"]
|
||
- **macro** - Activates `config!` macros for easy configure web application.
|
||
- **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
|
||
- **json_array** - Add EnvString impl for vector type (uses optional
|
||
`serde_json` package). ⚠ **_DEPRECATED_**
|
||
|
||
## 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
|