constellation-server 1.3.7

Pluggable authoritative DNS server. Entries can be added & removed from an HTTP REST API.
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// Constellation
//
// Pluggable authoritative DNS server
// Copyright: 2018, Valerian Saliou <valerian@valeriansaliou.name>
// License: Mozilla Public License v2.0 (MPL v2.0)

use std::thread;
use std::io::{copy, Seek, SeekFrom};
use std::time::Duration;
use std::fs::File;
use reqwest;
use tempfile::tempfile;
use flate2::read::GzDecoder;
use tar::{Archive, Entries};

use super::locate::Locator;
use APP_CONF;

pub struct GeoUpdaterBuilder;
pub struct GeoUpdater;

impl GeoUpdaterBuilder {
    pub fn new() -> GeoUpdater {
        GeoUpdater {}
    }
}

impl GeoUpdater {
    pub fn run(&self) {
        let interval_duration = Duration::from_secs(APP_CONF.geo.update_interval);

        debug!(
            "scheduled background geo updates every: {:?}",
            interval_duration
        );

        loop {
            // Hold for next poll run
            thread::sleep(interval_duration);

            info!("running a geo update operation...");

            // Hold on 2 seconds
            thread::sleep(Duration::from_secs(2));

            match Self::update_database() {
                Ok(_) => {
                    info!("ran geo update operation");

                    match Locator::request_geo_refresh() {
                        Ok(_) => info!("refreshed geo reader"),
                        Err(err) => error!("failure to refresh geo reader: {}", err),
                    }
                }
                Err(Some(err)) => error!("failed running geo update operation: {}", err),
                Err(None) => error!("failed running geo update operation (no reason given)"),
            }
        }
    }

    fn extract_archive(entries: Entries<GzDecoder<File>>) -> bool {
        for file_entry in entries {
            if let Ok(mut file) = file_entry {
                // Copy path (ie. own it)
                let file_path = file.path().map(|path| path.into_owned());

                if let Ok(path) = file_path {
                    if path.ends_with(&APP_CONF.geo.database_file) == true {
                        let database_path = Locator::get_database_full_path();

                        match file.unpack(&database_path) {
                            Ok(_) => {
                                info!("unpacked geo database archive to file: {:?}", database_path);

                                return true;
                            }
                            Err(err) => {
                                error!("failed to unpack geo database archive file: {:?}", err);
                            }
                        }
                    }
                }
            }
        }

        return false;
    }

    fn update_database() -> Result<(), Option<reqwest::Error>> {
        debug!("acquiring updated geo database");

        match reqwest::get(&APP_CONF.geo.update_url) {
            Ok(mut response) => {
                info!("acquired updated geo database archive");

                match tempfile() {
                    Ok(mut tmp_file) => {
                        if copy(&mut response, &mut tmp_file).is_ok() == true {
                            debug!(
                                "downloaded updated geo database archive to file: {:?}",
                                tmp_file
                            );

                            // Reset file cursor to the beginning (prepare for reading)
                            tmp_file.seek(SeekFrom::Start(0)).unwrap();

                            // Extract archive
                            let tar = GzDecoder::new(tmp_file);

                            match Archive::new(tar).entries() {
                                Ok(entries) => {
                                    if Self::extract_archive(entries) == true {
                                        Ok(())
                                    } else {
                                        error!(
                                            "no matching mmdb file found in geo database archive"
                                        );

                                        Err(None)
                                    }
                                }
                                Err(_) => {
                                    error!("failed to list entries in geo database archive");

                                    Err(None)
                                }
                            }
                        } else {
                            error!("failed to download updated geo database archive");

                            Err(None)
                        }
                    }
                    Err(err) => {
                        error!(
                            "failed to create temporary file for geo database download: {:?}",
                            err
                        );

                        Err(None)
                    }
                }
            }
            Err(err) => Err(Some(err)),
        }
    }
}