rsddns/src/config/load.rs

use std::fs::File;
use std::io::prelude::*;

use serde_yaml;

use crate::config::error::ConfigError;
use crate::config::model::Config;

fn read_config(yaml_str: &str) -> Result<Config, ConfigError> {
    match serde_yaml::from_str(yaml_str) {
        Ok(v) => Result::Ok(v),
        Err(e) => Result::Err(ConfigError::new("Invalid Configuration", Option::Some(Box::from(e))))
    }
}

pub fn read(path: &str) -> Result<Config, ConfigError> {
    match File::open(path) {
        Ok(mut file) => {
            let mut contents = String::new();
            match file.read_to_string(&mut contents) {
                Ok(c) => {
                    if c > 0 {
                        read_config(&contents)
                    } else {
                        Result::Err(ConfigError::new("Empty Configuration File", Option::None))
                    }
                }
                Err(e) => Result::Err(ConfigError::new("Cannot Read Configuration File", Option::Some(Box::from(e))))
            }
        }
        Err(_e) => Result::Err(ConfigError::new(&format!("Configuration File Doesn't Exist \"{}\"", path), Option::None))
    }
}