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//! Defines the application environment.
//! By given the environment you can also load the application configuration
//!
//! # Example:
//!
//! ```rust
//! use std::str::FromStr;
//! use loco_rs::environment::Environment;
//!
//! pub fn load(environment: &str) {
//! let environment = Environment::from_str(environment).unwrap_or(Environment::Any(environment.to_string()));
//! let config = environment.load().expect("failed to load environment");
//! }
//! ```
use std::{path::Path, str::FromStr};
use serde::{Deserialize, Serialize};
use serde_variant::to_variant_name;
use super::config::Config;
use crate::Result;
#[must_use]
pub fn resolve_from_env() -> Option<String> {
std::env::var("LOCO_ENV")
.or_else(|_| std::env::var("RAILS_ENV"))
.or_else(|_| std::env::var("NODE_ENV"))
.ok()
}
/// Application environment
#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, Eq)]
pub enum Environment {
#[serde(rename = "production")]
Production,
#[serde(rename = "development")]
Development,
#[serde(rename = "test")]
Test,
Any(String),
}
impl Environment {
/// Load environment variables from local configuration
///
/// # Errors
///
/// Returns a [`ConfigError`] if an error occurs during loading
/// configuration file an parse into [`Config`] struct.
pub fn load(&self) -> Result<Config> {
Config::new(self)
}
/// Load environment variables from the given config path
///
/// # Errors
///
/// Returns a [`ConfigError`] if an error occurs during loading
/// configuration file an parse into [`Config`] struct.
pub fn load_from_folder(&self, path: &Path) -> Result<Config> {
Config::from_folder(self, path)
}
}
impl std::fmt::Display for Environment {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
to_variant_name(self).expect("only enum supported").fmt(f)
}
}
impl FromStr for Environment {
type Err = &'static str;
fn from_str(input: &str) -> std::result::Result<Self, Self::Err> {
match input {
"production" => Ok(Self::Production),
"development" => Ok(Self::Development),
"test" => Ok(Self::Test),
_ => Err(
" error parsing environment: expected one of \"production\", \"development\", \
\"test\" or any environment that has config file",
),
}
}
}