178 lines
5.1 KiB
Markdown
178 lines
5.1 KiB
Markdown
# itconfig
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[](https://travis-ci.org/icetemple/itconfig-rs)
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[](https://docs.rs/itconfig)
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[](https://crates.io/crates/itconfig)
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[](https://gitter.im/icetemple/itconfig-rs?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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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 are widely used
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and often there are more then 50 of them. First I looked at already created libraries.
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But there it's necessary to initialise structure that needs to be moved to each function
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where you need variable. It uses little bit memory, but configuration lifetime is as long
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as application lifetime. Because of it I decided to create my own library.
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## Installation
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These macros require a Rust compiler version 1.31 or newer.
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Add `itconfig = { version = "1.0", features = ["macro"] }` as a dependency in `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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## Example 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_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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APP {
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static BASE_URL => "/api", // &'static str by default
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ARTICLE {
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static PER_PAGE: u32 => 15,
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}
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#[cfg(feature = "companies")]
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COMPANY {
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#[env_name = "INSTITUTIONS_PER_PAGE"]
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static PER_PAGE: u32 => 15,
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}
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}
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FEATURE {
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NEW_MENU: bool => false,
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COMPANY {
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PROFILE: bool => false,
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}
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}
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}
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fn main () {
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// dotenv().ok();
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env::set_var("FEATURE_NEW_MENU", "t");
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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::APP:ARTICLE:PER_PAGE(), 15);
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assert_eq!(config::FEATURE::NEW_MENU(), true);
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}
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```
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Macro is an optional feature, enabled by default. You can install itconfig without default
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features and use this lib as shown below
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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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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
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```
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## Roadmap
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* [x] Add namespace for variables
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* [x] Custom env name
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* [x] Support feature config and other meta directives
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* [x] Add default value to env if env is not found
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* [x] Concat env variables to one variable
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* [x] Add nested namespaces
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* [x] Support meta for namespaces
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* [x] Support array type
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* [x] Rewrite to proc macro
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* [ ] Support hashmap type
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* [ ] Support custom env type
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* [ ] Common configuration for namespace variables
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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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* **array** - Add EnvString impl for vector type (uses optional `serde_json` package).
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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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## 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, 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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