158 lines
4.5 KiB
Markdown
158 lines
4.5 KiB
Markdown
# itconfig
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[](https://travis-ci.org/icetemple/itconfig-rs)
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[](https://github.com/rust-secure-code/safety-dance/)
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[](https://docs.rs/itconfig)
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[](https://crates.io/crates/itconfig)
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Easy build a configs from environment variables and use it in globally.
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We recommend you start with the [documentation].
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## Motivation
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I began to use rust with web programming experience where environment variables
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are widely used and often there are more then 50 of them. First I looked at
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already created libraries. But there it's necessary to initialise structure that
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needs to be moved to each function where you need variable. It uses little bit
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memory, but configuration lifetime is as long as application lifetime. Because
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of it I decided to create my own library.
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## Installation
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The MSRV is 1.39.0
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Add `itconfig = { version = "1.0", features = ["macro"] }` as a dependency in
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`Cargo.toml`.
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`Cargo.toml` example:
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```toml
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[package]
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name = "my-crate"
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version = "0.1.0"
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authors = ["Me <user@rust-lang.org>"]
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[dependencies]
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itconfig = { version = "1.0", features = ["macro"] }
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```
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## Basic usage
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```rust
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use itconfig::config;
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use std::env;
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//use dotenv::dotenv;
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config! {
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DEBUG: bool => false,
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#[env_name = "APP_HOST"]
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HOST: String => "127.0.0.1",
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database {
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URL < (
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"postgres://",
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POSTGRES_USERNAME => "user",
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":",
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POSTGRES_PASSWORD => "pass",
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"@",
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POSTGRES_HOST => "localhost:5432",
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"/",
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POSTGRES_DB => "test",
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),
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pool {
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MAX_SIZE: usize => 15,
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},
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},
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sentry {
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DSN: Option<&'static str>,
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},
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feature {
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static CORS: bool => false,
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static GRAPHQL_PLAYGROUND: bool => false,
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},
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}
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fn main () {
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// dotenv().expect("dotenv setup to be successful");
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// or
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env::set_var("FEATURE_CORS", "true");
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config::init();
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assert_eq!(config::HOST(), String::from("127.0.0.1"));
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assert_eq!(config::database::URL(), String::from("postgres://user:pass@localhost:5432/test"));
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assert_eq!(config::database::pool::MAX_SIZE(), 15);
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assert_eq!(config::sentry::DSN(), None);
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assert_eq!(config::feature::CORS(), true);
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}
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```
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Macro is an optional feature, disabled by default. You can use this library
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without macro
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```rust
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use itconfig::*;
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use std::env;
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// use dotenv::dotenv;
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fn main() {
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// dotenv().expect("dotenv setup to be successful");
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// or
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env::set_var("DATABASE_URL", "postgres://127.0.0.1:5432/test");
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let database_url = get_env::<String>("DATABASE_URL").unwrap();
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let new_profile: bool = get_env_or_default("FEATURE_NEW_PROFILE", false);
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let articles_per_page: u32 = get_env_or_set_default("ARTICLES_PER_PAGE", 10);
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}
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```
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## Running tests
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```bash
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cargo test --all-features
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```
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## Available features
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- **default** - ["primitives"]
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- **macro** - Activates `config!` macros for easy configure web application.
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- **primitives** - Group for features: `numbers` and `bool`.
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- **numbers** - Group for features: `int`, `uint` and `float`.
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- **int** - Group for features: `i8`, `i16`, `i32`, `i64`, `i128` and `isize`.
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- **uint** - Group for features: `u8`, `u16`, `u32`, `u64`, `u128` and `usize`.
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- **float** - Group for features: `f32` and `f64`
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- **i8** - impl EnvString for `i8` type
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- **i16** - impl EnvString for `i16` type
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- **i32** - impl EnvString for `i32` type
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- **i64** - impl EnvString for `i64` type
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- **i128** - impl EnvString for `i128` type
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- **isize** - impl EnvString for `isize` type
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- **u8** - impl EnvString for `u8` type
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- **u16** - impl EnvString for `u16` type
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- **u32** - impl EnvString for `u32` type
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- **u64** - impl EnvString for `u64` type
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- **u128** - impl EnvString for `u128` type
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- **usize** - impl EnvString for `usize` type
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- **f32** - impl EnvString for `f32` type
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- **f64** - impl EnvString for `f64` type
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- **bool** - impl EnvString for `bool` type
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- **json_array** - Add EnvString impl for vector type (uses optional
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`serde_json` package). ⚠ **_DEPRECATED_**
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## License
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[MIT] © [Ice Temple](https://github.com/icetemple)
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## Contributors
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[pleshevskiy](https://github.com/pleshevskiy) (Dmitriy Pleshevskiy) – creator,
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maintainer.
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[documentation]: https://docs.rs/itconfig
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[MIT]: https://github.com/icetemple/itconfig-rs/blob/master/LICENSE
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