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itconfig
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Dmitriy Pleshevskiy 2019-12-22 13:13:29 +03:00
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.env Normal file
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DEBUG=1
TESTING=0
SECRET_KEY='hello:)'
DATABASE_URL='postgres:/'

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.gitignore vendored Normal file
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.idea/
/target
Cargo.lock
src/main.rs
.env*

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Cargo.toml Normal file
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[package]
name = "itconfig"
version = "0.1.1"
authors = ["Dmitriy Pleshevskiy <dmitriy@ideascup.me>"]
description = "Easy build a configs from environment variables and use it in globally."
categories = ["config", "web-programming"]
keywords = ["config", "env", "macro", "configuration", "environment"]
edition = "2018"
license = "MIT"
repository = "https://github.com/icetemple/itconfig-rs"
homepage = "https://github.com/icetemple/itconfig-rs"
documentation = "https://docs.rs/itconfig"
readme = "README.md"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]

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MIT License
Copyright (c) 2019 IceTemple
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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README.md Normal file
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# itconfig
Simple configuration with macro for rust application.
We recommend you start with the [documentation].
## Example usage
```rust
#[macro_use] extern crate itconfig;
use dotenv::dotenv;
config! {
DATABASE_URL: bool,
HOST: String => "127.0.0.1",
}
fn main () {
dotenv().ok();
cfg::init();
assert_eq(cfg::HOST(), String::from("127.0.0.1");
}
```
[documentation]: https://docs.rs/itconfig

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src/lib.rs Normal file
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//! # itconfig
//!
//! Simple configuration with macro for rust application.
//!
//!
//!
//! ## Example usage
//!
//! ```
//! #[macro_use] extern crate itconfig;
//! use dotenv::dotenv;
//!
//! config! {
//! DATABASE_URL: bool,
//! HOST: String => "127.0.0.1",
//! }
//!
//! fn main () {
//! dotenv().ok();
//! cfg::init();
//! assert_eq(cfg::HOST(), String::from("127.0.0.1");
//! }
#[doc(hidden)]
macro_rules! __impl_from_for_numbers {
(
$($ty:ty),+
) => {
$(
impl From<EnvValue> for $ty {
fn from(env: EnvValue) -> Self {
env.0.parse::<Self>().unwrap()
}
}
)*
}
}
#[derive(Debug)]
#[doc(hidden)]
pub struct EnvValue(String);
impl EnvValue {
pub fn new(string: String) -> Self {
Self(string)
}
}
__impl_from_for_numbers![
i8, i16, i32, i64, i128, isize,
u8, u16, u32, u64, u128, usize,
f32, f64
];
impl From<EnvValue> for bool {
fn from(env: EnvValue) -> Self {
match env.0.to_lowercase().as_str() {
"true" | "1" | "t" | "on" => true,
_ => false,
}
}
}
impl From<String> for EnvValue {
fn from(val: String) -> Self {
Self(val)
}
}
impl From<EnvValue> for String {
fn from(env: EnvValue) -> Self {
env.0
}
}
/// Creates new public 'cfg' mod with function fo get each environment variable of mapping.
///
/// All variables are required and program will panic if some variables haven't value, but you
/// can add default value for specific variable.
///
/// Example usage
/// -------------
///
/// ```rust
/// # #[macro_use] extern crate itconfig;
/// config! {
/// DATABASE_URL: bool,
/// }
///
/// # fn main () {
/// # use std::env;
/// # env::set_var("DATABASE_URL", "sqlite://");
/// #
/// # cfg::init();
/// # assert_eq(cfg::DATABASE_URL(), true);
/// # }
/// ```
///
/// Config with default value
///
/// ```rust
/// # #[macro_use] extern crate itconfig;
/// config! {
/// DATABASE_URL: bool,
/// HOST: String => "127.0.0.1",
/// }
///
/// # fn main () {
/// # cfg::init();
/// # assert_eq(cfg::HOST(), String::from("127.0.0.1");
/// # }
/// ```
///
/// This module will also contain helper method:
///
/// `init`
/// ------
///
/// If you miss some required variables your application will panic at startup.
/// Run this at the main function for check all required variables without default value.
///
/// ```rust
/// #[macro_use] extern crate itconfig;
///
/// config! {
/// DATABASE_URL: bool,
/// HOST: String => "127.0.0.1",
/// }
///
/// fn main () {
/// cfg::init();
/// assert_eq(cfg::HOST(), String::from("127.0.0.1");
/// }
/// ```
///
/// Also dotenv module is supported
///
/// ```rust
/// #[macro_use] extern crate itconfig;
/// use dotenv::dotenv;
///
/// config! {
/// DATABASE_URL: bool,
/// HOST: String => "127.0.0.1",
/// }
///
/// fn main () {
/// dotenv().ok();
/// cfg::init();
/// assert_eq(cfg::HOST(), String::from("127.0.0.1");
/// }
/// ```
///
#[macro_export]
macro_rules! config {
($($tokens:tt)*) => {
__config_parse_variables!(
tokens = [$($tokens)*],
variables = [],
);
}
}
#[macro_export]
#[doc(hidden)]
macro_rules! __invalid_config_syntax {
() => {
compile_error!(
"Invalid `config!` syntax. Please see the `config!` macro docs for more info."
);
};
}
#[macro_export]
#[doc(hidden)]
macro_rules! __config_parse_variables {
// Find general config of variable
(
tokens = [
$name:ident : $ty:ty => $default:expr,
$($rest:tt)*
],
$($args:tt)*
) => {
__config_parse_variables!(
current_variable = {
name = $name,
ty = $ty,
env_name = stringify!($name),
default = $default,
},
tokens = [$($rest)*],
$($args)*
);
};
(
tokens = [
$name:ident : $ty:ty,
$($rest:tt)*
],
$($args:tt)*
) => {
__config_parse_variables!(
current_variable = {
name = $name,
ty = $ty,
env_name = stringify!($name),
},
tokens = [$($rest)*],
$($args)*
);
};
// Done parsing variable
(
current_variable = {
$($current_variable:tt)*
},
tokens = $tokens:tt,
variables = [$($variables:tt,)*],
$($args:tt)*
) => {
__config_parse_variables!(
tokens = $tokens,
variables = [$($variables,)* { $($current_variable)* },],
);
};
// Done parsing all variables
(
tokens = [],
$($args:tt)*
) => {
__config_impl!($($args)*);
};
// Invalid syntax
($($tokens:tt)*) => {
__invalid_config_syntax!();
};
}
#[macro_export]
#[doc(hidden)]
macro_rules! __config_impl {
(
variables = [$({
name = $name:ident,
$($variable:tt)*
},)+],
) => {
pub mod cfg {
#![allow(non_snake_case)]
use std::env;
use $crate::EnvValue;
pub fn init() {
$($name();)+
}
$(__config_variable! {
name = $name,
$($variable)*
})+
}
};
}
#[macro_export]
#[doc(hidden)]
macro_rules! __config_variable {
// Add method with default value
(
name = $name:ident,
ty = $ty:ty,
env_name = $env_name:expr,
default = $default:expr,
) => {
pub fn $name() -> $ty {
env::var($env_name)
.map(|val| EnvValue::from(val).into())
.unwrap_or_else(|_| $default)
}
};
// Add method without default value
(
name = $name:ident,
ty = $ty:ty,
env_name = $env_name:expr,
) => {
pub fn $name() -> $ty {
env::var($env_name)
.map(|val| EnvValue::from(val).into())
.unwrap_or_else(|_| {
panic!(format!(r#"Cannot read "{}" environment variable"#, $env_name))
})
}
};
}

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use std::env;
#[macro_use]
extern crate it_config;
#[test]
fn one_variable() {
config! {
DEBUG: bool => true,
}
assert_eq!(cfg::DEBUG(), true);
}
#[test]
fn few_variables() {
config! {
FOO: bool => true,
BAR: bool => false,
}
assert_eq!(cfg::FOO(), true);
assert_eq!(cfg::BAR(), false);
}
#[test]
fn different_types() {
config! {
NUMBER: i32 => 30,
BOOL: bool => true,
STRING: String => "string".to_string(),
}
assert_eq!(cfg::NUMBER(), 30);
assert_eq!(cfg::BOOL(), true);
assert_eq!(cfg::STRING(), "string");
}
#[test]
fn convert_bool_type_from_env() {
env::set_var("T_BOOL", "t");
env::set_var("TRUE_BOOL", "true");
env::set_var("NUM_BOOL", "1");
env::set_var("ON_BOOL", "on");
env::set_var("CAMEL_CASE", "True");
env::set_var("FALSE_BOOL", "false");
config! {
T_BOOL: bool,
TRUE_BOOL: bool,
NUM_BOOL: bool,
ON_BOOL: bool,
CAMEL_CASE: bool,
FALSE_BOOL: bool,
}
assert_eq!(cfg::T_BOOL(), true);
assert_eq!(cfg::TRUE_BOOL(), true);
assert_eq!(cfg::NUM_BOOL(), true);
assert_eq!(cfg::ON_BOOL(), true);
assert_eq!(cfg::CAMEL_CASE(), true);
assert_eq!(cfg::FALSE_BOOL(), false);
}
#[test]
fn convert_number_value_from_env() {
env::set_var("I8", "10");
env::set_var("I16", "10");
env::set_var("I32", "10");
env::set_var("I64", "10");
env::set_var("I128", "10");
env::set_var("ISIZE","10");
env::set_var("U8", "10");
env::set_var("U16", "10");
env::set_var("U32", "10");
env::set_var("U64", "10");
env::set_var("U128", "10");
env::set_var("USIZE","10");
env::set_var("F32", "10");
env::set_var("F64","10");
config! {
I8: i8,
I16: i16,
I32: i32,
I64: i64,
I128: i128,
ISIZE: isize,
U8: u8,
U16: u16,
U32: u32,
U64: u64,
U128: u128,
USIZE: usize,
F32: f32,
F64: f64,
}
assert_eq!(cfg::I8(), 10);
assert_eq!(cfg::I16(), 10);
assert_eq!(cfg::I32(), 10);
assert_eq!(cfg::I64(), 10);
assert_eq!(cfg::ISIZE(), 10);
assert_eq!(cfg::U8(), 10);
assert_eq!(cfg::U16(), 10);
assert_eq!(cfg::U32(), 10);
assert_eq!(cfg::U64(), 10);
assert_eq!(cfg::USIZE(), 10);
assert_eq!(cfg::F32(), 10.0);
assert_eq!(cfg::F64(), 10.0);
}