Albatross/src/main.rs

use chrono::{NaiveDateTime, Utc};
use clap::{App, Arg};
use std::fs::{create_dir_all, remove_dir_all, remove_file, DirEntry};
use std::path::PathBuf;
use std::time::Instant;

mod backup;
mod config;
mod discord;
mod region;

use crate::config::{AlbatrossConfig, WorldType};
use backup::{backup_end, backup_nether, backup_overworld};
use discord::send_webhook;

/// Get the time of the backup from a file name
///
/// # Param
/// * `archive_entry`: archive entry
fn get_time_from_file_name(
    archive_entry: &DirEntry,
) -> Result<Option<NaiveDateTime>, std::io::Error> {
    let file_name = archive_entry.file_name().to_str().unwrap().to_string();
    let name: Vec<&str> = file_name.split('_').collect();

    Ok(chrono::NaiveDateTime::parse_from_str(name[0], "%d-%m-%y-%H.%M.%S").ok())
}

/// Removes the old backups from the ouput directory
///
/// # Params
/// * `output_dir` - output directory containing
/// * `keep` - number of backups to keep
fn remove_old_backups(output_dir: &PathBuf, keep: u64) -> Result<usize, std::io::Error> {
    let mut backups = vec![];
    let mut num_of_removed_backups: usize = 0;

    for entry in output_dir.read_dir()? {
        let entry = entry?;

        if let Some(ext) = entry.path().extension() {
            if ext == "gz" {
                backups.push(entry);
            }
        }
    }

    if backups.len() > keep as usize {
        backups.sort_by(|a, b| {
            let a_time = get_time_from_file_name(a).unwrap().unwrap();
            let b_time = get_time_from_file_name(b).unwrap().unwrap();

            b_time.cmp(&a_time)
        });

        num_of_removed_backups = backups.len() - keep as usize;

        for _i in 0..num_of_removed_backups {
            let oldest = backups.pop().unwrap();
            remove_file(oldest.path())?;
        }
    }

    Ok(num_of_removed_backups)
}

/// Backup the configured worlds from a minecraft server
///
/// # Params
/// * `cfg` - config file
fn do_backup(cfg: AlbatrossConfig) -> Result<(), std::io::Error> {
    let server_base_dir = cfg.backup.minecraft_dir.clone();
    let worlds = cfg.world_config.clone().expect("No worlds configured");
    let time_str = Utc::now().format("%d-%m-%y-%H.%M.%S").to_string();
    let backup_name = format!("{}_backup.tar.gz", time_str);
    let mut output_archive = cfg.backup.output_dir.clone();
    output_archive.push(backup_name);
    let mut tmp_dir = cfg.backup.output_dir.clone();
    tmp_dir.push("tmp");
    remove_dir_all(&tmp_dir).ok();

    create_dir_all(tmp_dir.clone()).unwrap();

    send_webhook("**Albatross is swooping in to backup your worlds!**", &cfg);
    let timer = Instant::now();
    for world in worlds {
        let mut world_dir = server_base_dir.clone();
        let world_name = world.world_name.clone();
        let world_type = match world.world_type.clone() {
            Some(world_type) => world_type,
            None => WorldType::OVERWORLD,
        };
        world_dir.push(world_name.clone());

        if world_dir.exists() && world_dir.is_dir() {
            send_webhook(
                format!("Starting backup of **{}**", world_name).as_str(),
                &cfg,
            );
            let webhook_msg = match world_type {
                WorldType::OVERWORLD => {
                    let (region_count, player_count) =
                        backup_overworld(world_dir.clone(), tmp_dir.clone(), &world)?;
                    format!(
                        "{} regions and {} player files backed up.",
                        region_count, player_count
                    )
                }
                WorldType::NETHER => {
                    let region_count = backup_nether(world_dir, tmp_dir.clone(), &world)?;
                    format!("{} regions backed up.", region_count)
                }
                WorldType::END => {
                    let region_count = backup_end(world_dir, tmp_dir.clone(), &world)?;
                    format!("{} regions backed up.", region_count)
                }
            };

            send_webhook(&webhook_msg, &cfg);
        } else {
            send_webhook(format!("Error: {} not found.", world_name).as_str(), &cfg);
            println!("World \"{}\" not found", world_name.clone());
        }
    }

    backup::compress_backup(&tmp_dir, &output_archive)?;

    remove_dir_all(&tmp_dir)?;

    let backups_removed = remove_old_backups(&cfg.backup.output_dir, cfg.backup.backups_to_keep)?;

    if backups_removed > 0 {
        let msg = format!(
            "Albatross mistook **{}** of your old backups for some french fries and ate them!! SKRAWWWW",
            backups_removed
        );
        send_webhook(msg.as_str(), &cfg);
    }

    let secs = timer.elapsed().as_secs();
    send_webhook(
        format!("**Full backup completed in {}s**! *SKREEEEEEEEEE*", secs).as_str(),
        &cfg,
    );
    Ok(())
}

/// Albatross
///
/// Run backups of a Minecraft world
fn main() {
    let mut app = App::new("Albatross").about("Backup your worlds").arg(
        Arg::with_name("config")
            .index(1)
            .short("c")
            .long("config")
            .value_name("CONFIG_PATH")
            .help("Config file path"),
    );
    // Get arg parser
    let matches = app.clone().get_matches();

    if let Some(cfg_path) = matches.value_of("config") {
        let cfg = AlbatrossConfig::new(cfg_path).expect("Config not found");

        if cfg.world_config.is_some() {
            println!("Starting backup");
            match do_backup(cfg) {
                Ok(_) => println!("Backup complete"),
                Err(e) => println!("Error doing backup: {:?}", e),
            }
        } else {
            println!("No worlds specified to backed up!")
        }
    } else {
        app.print_help().expect("Unable to print help");
    }
}