|
|
|
use crate::utils::caching::CacheStorage;
|
|
|
|
use indicatif::{ProgressBar, ProgressStyle};
|
|
|
|
use parking_lot::Mutex;
|
|
|
|
use rayon::prelude::*;
|
|
|
|
use std::fs::read;
|
|
|
|
use std::path::PathBuf;
|
|
|
|
use std::sync::Arc;
|
|
|
|
|
|
|
|
/// A manager for downloading urls in parallel
|
|
|
|
#[derive(Clone, Debug)]
|
|
|
|
pub struct DownloadManager {
|
|
|
|
downloads: Vec<Arc<Mutex<PendingDownload>>>,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl DownloadManager {
|
|
|
|
/// Creates a new download manager
|
|
|
|
pub fn new() -> Self {
|
|
|
|
Self {
|
|
|
|
downloads: Vec::new(),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Adds a new pending download
|
|
|
|
pub fn add_download(&mut self, path: String) -> Arc<Mutex<PendingDownload>> {
|
|
|
|
let download = PendingDownload::new(path.clone());
|
|
|
|
let pending = Arc::new(Mutex::new(download));
|
|
|
|
self.downloads.push(Arc::clone(&pending));
|
|
|
|
log::debug!("Added download {}", path);
|
|
|
|
|
|
|
|
pending
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Downloads all download entries
|
|
|
|
pub fn download_all(&self) {
|
|
|
|
let pb = Arc::new(Mutex::new(ProgressBar::new(self.downloads.len() as u64)));
|
|
|
|
pb.lock().set_style(
|
|
|
|
ProgressStyle::default_bar()
|
|
|
|
.template("Fetching Embeds: [{bar:40.cyan/blue}]")
|
|
|
|
.progress_chars("=> "),
|
|
|
|
);
|
|
|
|
let pb_cloned = Arc::clone(&pb);
|
|
|
|
|
|
|
|
self.downloads.par_iter().for_each_with(pb_cloned, |pb, d| {
|
|
|
|
d.lock().download();
|
|
|
|
pb.lock().inc(1);
|
|
|
|
});
|
|
|
|
pb.lock().finish_and_clear();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// A pending download entry.
|
|
|
|
/// Download does not necessarily mean that it's not a local file
|
|
|
|
#[derive(Clone, Debug)]
|
|
|
|
pub struct PendingDownload {
|
|
|
|
pub(crate) path: String,
|
|
|
|
pub(crate) data: Option<Vec<u8>>,
|
|
|
|
pub(crate) use_cache: bool,
|
|
|
|
cache: CacheStorage,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl PendingDownload {
|
|
|
|
pub fn new(path: String) -> Self {
|
|
|
|
Self {
|
|
|
|
path,
|
|
|
|
data: None,
|
|
|
|
use_cache: true,
|
|
|
|
cache: CacheStorage::new(),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Downloads the file and writes the content to the content field
|
|
|
|
pub fn download(&mut self) {
|
|
|
|
self.data = self.read_content();
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Reads the fiels content or downloads it if it doesn't exist in the filesystem
|
|
|
|
fn read_content(&self) -> Option<Vec<u8>> {
|
|
|
|
let path = PathBuf::from(&self.path);
|
|
|
|
|
|
|
|
if path.exists() {
|
|
|
|
read(path).ok()
|
|
|
|
} else if let Some(contents) = self.read_from_cache() {
|
|
|
|
log::debug!("Read {} from cache.", self.path.clone());
|
|
|
|
Some(contents)
|
|
|
|
} else {
|
|
|
|
if let Some(data) = self.download_content() {
|
|
|
|
self.store_to_cache(&data);
|
|
|
|
Some(data)
|
|
|
|
} else {
|
|
|
|
None
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Stores the data to a cache file to retrieve it later
|
|
|
|
fn store_to_cache(&self, data: &Vec<u8>) {
|
|
|
|
if self.use_cache {
|
|
|
|
let path = PathBuf::from(&self.path);
|
|
|
|
self.cache
|
|
|
|
.write(&path, data.clone())
|
|
|
|
.unwrap_or_else(|_| log::warn!("Failed to write file to cache: {}", self.path));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn read_from_cache(&self) -> Option<Vec<u8>> {
|
|
|
|
let path = PathBuf::from(&self.path);
|
|
|
|
|
|
|
|
if self.cache.has_file(&path) && self.use_cache {
|
|
|
|
self.cache.read(&path).ok()
|
|
|
|
} else {
|
|
|
|
None
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Downloads the content from the given url
|
|
|
|
fn download_content(&self) -> Option<Vec<u8>> {
|
|
|
|
download_path(self.path.clone())
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn download_path(path: String) -> Option<Vec<u8>> {
|
|
|
|
reqwest::blocking::get(&path)
|
|
|
|
.ok()
|
|
|
|
.map(|c| c.bytes())
|
|
|
|
.and_then(|b| b.ok())
|
|
|
|
.map(|b| b.to_vec())
|
|
|
|
}
|