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extern crate publicsuffix;
#[macro_use]
extern crate lazy_static;
extern crate parking_lot;
#[macro_use]
extern crate slog;
#[macro_use]
extern crate slog_scope;
extern crate app_dirs;
#[cfg(test)]
mod tests;
use std::thread;
use std::io::Write;
use std::path::PathBuf;
use std::time::Duration;
use std::fs::{self, File};
use publicsuffix::errors::*;
use publicsuffix::{List, IntoUrl};
use parking_lot::{RwLock, RwLockReadGuard};
use slog::Logger;
use slog_scope::set_global_logger;
use app_dirs::{AppDataType, AppInfo, app_root};
lazy_static! {
static ref LIST: RwLock<List> = RwLock::new(List::empty());
}
const APP_INFO: AppInfo = AppInfo {
name: "publicsuffix",
author: "mozilla",
};
pub type ListGuard<'a> = RwLockReadGuard<'a, List>;
#[derive(Debug, Clone)]
struct Cache {
url: String,
freq: Duration,
}
impl Cache {
fn new(url: String, freq: Duration) -> Cache {
Cache {
url: url,
freq: freq,
}
}
fn path(&self) -> Result<PathBuf> {
app_root(AppDataType::UserCache, &APP_INFO)
.chain_err(|| "error accessing the data directory")
.and_then(|mut file| {
file.push("list.dat");
Ok(file)
})
}
fn update(&self) -> Result<()> {
let mut list = LIST.write();
*list = self.list()?;
info!("the list has been updated successfully");
Ok(())
}
fn list(&self) -> Result<List> {
match self.path() {
Ok(path) => {
if path.is_file() {
let last_update = path.metadata()?.modified()?;
let elapsed = last_update.elapsed()
.chain_err(|| "failed to get elapsed time")?;
if elapsed > self.freq {
self.download_and_save()
.or_else(|error| {
info!("failed to download file: {}", error);
info!("updating the public suffix list from {}", path.to_str().unwrap());
List::from_path(path)
})
} else {
info!("updating the public suffix list from {}", path.to_str().unwrap());
List::from_path(path)
.or_else(|error| {
info!("failed to retrieve the list from local cache: {}", error);
info!("updating the public suffix list from {}", self.url);
self.download_and_save()
})
}
} else {
self.download_and_save()
}
}
Err(error) => {
warn!("failed querying cache path: {}", error);
self.download_and_save()
}
}
}
fn download_and_save(&self) -> Result<List> {
info!("updating the public suffix list from {}", self.url);
let list = List::from_url(&self.url)?;
if let Err(error) = self.save(&list) {
warn!("failed to save the list to disk: {}", error);
}
Ok(list)
}
fn save(&self, list: &List) -> Result<()> {
let file = self.path()?;
if list.all().is_empty() {
fs::remove_file(file)?;
return Ok(());
}
let mut data = String::with_capacity(list.all().len());
if !list.icann().is_empty() {
data.push_str("// ===BEGIN ICANN DOMAINS===\n");
for rule in list.icann() {
data.push_str(&format!("{}\n", rule));
}
}
if !list.private().is_empty() {
data.push_str("// ===BEGIN PRIVATE DOMAINS===\n");
for rule in list.private() {
data.push_str(&format!("{}\n", rule));
}
}
let mut file = File::create(file)?;
file.write_all(data.as_bytes())?;
file.sync_all()?;
Ok(())
}
}
pub fn init<U, D>(url: U, every: D) -> Result<()>
where U: IntoUrl,
D: Into<Option<Duration>>
{
let url = url.into_url()?.into_string();
let freq = every.into().unwrap_or(Duration::from_secs(60 * 60 * 24 * 7));
let cache = Cache::new(url, freq);
cache.update()?;
thread::spawn(move || {
loop {
thread::sleep(cache.freq);
loop {
match cache.update() {
Ok(_) => break,
Err(error) => {
warn!("failed to update the list: {}", error);
info!("will try again in 5 minutes");
thread::sleep(Duration::from_secs(300));
}
}
}
}
});
Ok(())
}
pub fn get<'a>() -> ListGuard<'a> {
LIST.read()
}
pub fn set_logger(l: &Logger)
{
set_global_logger(l.clone());
}