oott/src/settings.rs

use config::{Config, ConfigError, File};
use lazy_static::lazy_static;
use log::error;
use serde::Deserialize;

// -----------------------------------------------------------
// Configuration structure
#[derive(Debug, Deserialize, Clone)]
pub struct Log {
    pub level: String,
}

#[derive(Debug, Deserialize, Clone)]
pub struct Timings {
    pub arp_sender_timeout: u64,
    pub arp_scan_duration: u64,
}

#[derive(Debug, Deserialize, Clone)]
pub struct Settings {
    pub log: Log,
    pub timings: Timings,
}
// End configuration structure
// -----------------------------------------------------------

const CONFIG_FILE_PATH: &str = "./oott.toml";

impl Settings {
    pub fn new() -> Result<Self, ConfigError> {
        let local_settings = Config::builder()
            .add_source(File::with_name(CONFIG_FILE_PATH))
            .build()?;

        local_settings.try_deserialize()
    }
}

lazy_static! {
    pub static ref CONFIG: Settings = match Settings::new() {
        Ok(value) => value,
        Err(error) => {
            error!("Error reading configuration file ({CONFIG_FILE_PATH}): {error}");
            panic!("Error reading configuration file ({CONFIG_FILE_PATH}): {error}");
        }
    };
}