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use config::{Config, ConfigError, Environment, File};
use serde_derive::Deserialize;
use std::env;
#[derive(Debug, Deserialize)]
#[allow(unused)]
struct Database {
url: String,
}
#[derive(Debug, Deserialize)]
#[allow(unused)]
struct Sparkpost {
key: String,
token: String,
url: String,
version: u8,
}
#[derive(Debug, Deserialize)]
#[allow(unused)]
struct Twitter {
consumer_token: String,
consumer_secret: String,
}
#[derive(Debug, Deserialize)]
#[allow(unused)]
struct Braintree {
merchant_id: String,
public_key: String,
private_key: String,
}
#[derive(Debug, Deserialize)]
#[allow(unused)]
pub struct Settings {
debug: bool,
database: Database,
sparkpost: Sparkpost,
twitter: Twitter,
braintree: Braintree,
}
impl Settings {
pub fn new() -> Result<Self, ConfigError> {
let run_mode = env::var("RUN_MODE").unwrap_or_else(|_| "development".into());
let s = Config::builder()
// Start off by merging in the "default" configuration file
.add_source(File::with_name("examples/hierarchical-env/config/default"))
// Add in the current environment file
// Default to 'development' env
// Note that this file is _optional_
.add_source(
File::with_name(&format!("examples/hierarchical-env/config/{}", run_mode))
.required(false),
)
// Add in a local configuration file
// This file shouldn't be checked in to git
.add_source(File::with_name("examples/hierarchical-env/config/local").required(false))
// Add in settings from the environment (with a prefix of APP)
// Eg.. `APP_DEBUG=1 ./target/app` would set the `debug` key
.add_source(Environment::with_prefix("app"))
// You may also programmatically change settings
.set_override("database.url", "postgres://")?
.build()?;
// Now that we're done, let's access our configuration
println!("debug: {:?}", s.get_bool("debug"));
println!("database: {:?}", s.get::<String>("database.url"));
// You can deserialize (and thus freeze) the entire configuration as
s.try_deserialize()
}
}
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