login_app 0.1.5

// log.rs
// logging activities are implemented here

use std::fs::{File, OpenOptions, create_dir};
use std::path::Path;

use log::*;
use simplelog::*;
use chrono::prelude::*;

pub fn initialize() {
    let file = get_log_file();
    let log_level_on_terminal = super::app_config("log_level_on_terminal");
    let log_level_on_write = super::app_config("log_level_on_write");
    let mut multiple = vec![];
    match TermLogger::new(filter(&log_level_on_terminal), Config::default(), TerminalMode::Mixed) {
        Some(logger) => multiple.push(logger as Box<dyn SharedLogger>),
        None => multiple.push(SimpleLogger::new(filter(&log_level_on_terminal), Config::default())),
    }
    let write_logger = WriteLogger::new(filter(&log_level_on_write), Config::default(), file);
    multiple.push(write_logger);
    CombinedLogger::init(multiple).unwrap();
}

pub fn filter(level: &String) -> LevelFilter {
    match level.as_str() {
        "trace" => LevelFilter::Trace,
        "debug" => LevelFilter::Debug,
        "info"  => LevelFilter::Info,
        "warn"  => LevelFilter::Warn,
        "error" => LevelFilter::Error,
             _  => LevelFilter::Warn
    }
}

fn get_log_file() -> File {
    let folder = super::app_config("log_folder");
    create_log_dir(&folder); // it ensures that folder gets created if it doesn't already exist

    let filename = super::app_config("log_filename_prefix");

    let today: String = Local::today().format("%Y-%m-%d").to_string();

    let path_name = folder.to_owned() + &"/".to_string() + &filename + &today + ".log";
    let path = Path::new(&path_name);

    let file = OpenOptions::new().append(true).create(true).open(&path).unwrap_or_else( |error| {
        error!("problem in opening file: {:?}", error);
        panic!("problem in opening file: {:?}", error);
    });
    
    file
}

fn create_log_dir(folder: &String) -> bool {
    if Path::new(&folder).is_dir() {
        debug!("folder exists...{:?}, no need to create it", &folder);
        return false;
    }
    debug!(" {} folder does NOT exist", &folder);
    create_dir(&folder).unwrap();
    true
}

// END of login_app.rs