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/*-
 * cdns-rs - a simple sync/async DNS query library
 * Copyright (C) 2020  Aleksandr Morozov
 * 
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 *  file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

/// This file contains the config file parsers.

use std::path::Path;

use async_trait::async_trait;

use tokio::io::AsyncReadExt;
use tokio::fs::File;

use crate::{internal_error_map, error::*};


#[async_trait]
pub trait ConfigParser<T>
{
    async fn parse_config() -> CDnsResult<T>;

    fn get_file_path() -> &'static Path;

    fn is_default(&self) -> bool;
}

pub(super) async 
fn read_file(path: &str) -> CDnsResult<String>
{
    let mut file = 
        File::open(path).await
            .map_err(|e| internal_error_map!(CDnsErrorType::InternalError, "{}", e))?;

    let mut file_content: String = String::new();

    file.read_to_string(&mut file_content).await
        .map_err(|e| internal_error_map!(CDnsErrorType::InternalError, "{}", e))?;

    return Ok(file_content);
}