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use std::collections::HashSet;
use crate::*;
pub fn mount(extensions: &mut Extensions, manager: SmartPush) -> &mut Extensions {
let manager = Mutex::new(manager);
extensions.add_post(
post!(
request,
host,
response_pipe,
identity_body,
addr,
move |manager: Mutex<SmartPush>| {
push(
request,
host,
response_pipe,
identity_body,
addr,
Some(manager),
)
.await
}
),
Id::new(-32, "HTTP/2 push"),
);
extensions
}
pub fn always<'a>(
request: &'a FatRequest,
host: &'a Host,
response_pipe: &'a mut application::ResponseBodyPipe,
bytes: Bytes,
addr: SocketAddr,
) -> RetFut<'a, ()> {
Box::pin(push(request, host, response_pipe, bytes, addr, None))
}
pub struct SmartPush {
db: HashSet<SocketAddr>,
last_clear: Instant,
clear_interval: Duration,
check_every_request: u32,
iteration: u32,
}
impl SmartPush {
pub fn new(clear_interval: Duration, check_every_request: u32) -> Self {
Self {
db: HashSet::new(),
last_clear: Instant::now(),
clear_interval,
check_every_request,
iteration: 0,
}
}
fn accept(&mut self, remote: SocketAddr) -> bool {
if self.iteration >= self.check_every_request {
let now = Instant::now();
let elapsed = now - self.last_clear;
if elapsed > self.clear_interval {
self.last_clear = now;
self.db.clear();
}
}
self.iteration += 1;
!self.db.contains(&remote)
}
fn register(&mut self, remote: SocketAddr) {
self.db.insert(remote);
}
}
impl Default for SmartPush {
fn default() -> Self {
Self::new(Duration::from_secs(60 * 2), 8)
}
}
async fn push<'a>(
request: &'a FatRequest,
host: &'a Host,
response_pipe: &'a mut application::ResponseBodyPipe,
bytes: Bytes,
addr: SocketAddr,
manager: Option<&'a Mutex<SmartPush>>,
) {
use internals::*;
#[allow(irrefutable_let_patterns)]
if !matches!(response_pipe, ResponseBodyPipe::Http2(_, _)) {
return;
}
if let Some(manager) = manager {
let mut lock = manager.lock().await;
if !lock.accept(addr) {
return;
}
}
if request
.headers()
.get("user-agent")
.and_then(|user_agent| user_agent.to_str().ok())
.map_or(false, |user_agent| user_agent.contains("Firefox/"))
{
return;
}
const HTML_START: &str = "<!DOCTYPE html>";
match str::from_utf8(&bytes) {
Ok(string)
if string
.get(..HTML_START.len())
.map_or(false, |s| s.eq_ignore_ascii_case(HTML_START)) =>
{
let mut urls: Vec<_> = url_crawl::get_urls(string).map(String::from).collect();
urls.retain(|url| {
!url.contains(".jpg")
&& !url.contains(".avif")
&& !url.contains("png")
&& !url.contains(".webp")
&& !url.contains(".gif")
});
for url in &mut urls {
if !url.starts_with('/') && !url.contains(':') {
let path = request.uri().path();
let mut last_slash = 0;
for (pos, c) in path.chars().enumerate() {
if c == '/' {
last_slash = pos;
}
}
url.insert_str(0, &path[..=last_slash]);
}
}
debug!("Pushing urls {:?}", urls);
urls.sort_unstable();
urls.dedup();
for url in urls {
let mut uri = request.uri().clone().into_parts();
if let Some(uri) =
uri::PathAndQuery::from_maybe_shared::<Bytes>(url.into_bytes().into())
.ok()
.and_then(|path| {
uri.path_and_query = Some(path);
Uri::from_parts(uri).ok()
})
{
let mut push_request = Request::builder().uri(uri);
macro_rules! copy_header {
($builder: expr, $headers: expr, $name: expr) => {
for header in $headers.get_all($name) {
$builder = $builder.header($name, header);
}
};
}
let headers = request.headers();
copy_header!(push_request, headers, "accept-encoding");
copy_header!(push_request, headers, "accept-language");
copy_header!(push_request, headers, "user-agent");
copy_header!(push_request, headers, "host");
copy_header!(push_request, headers, "origin");
copy_header!(push_request, headers, "cookies");
let push_request = push_request
.body(())
.expect("failed to construct a request only from another valid request.");
let empty_request = utils::empty_clone_request(&push_request);
let response_pipe = match response_pipe.push_request(empty_request) {
Ok(pipe) => pipe,
Err(_) => return,
};
let mut push_request =
push_request.map(|_| kvarn::application::Body::Bytes(Bytes::new().into()));
let response = kvarn::handle_cache(&mut push_request, addr, host).await;
if let Err(err) = kvarn::SendKind::Push(response_pipe)
.send(response, request, host, addr)
.await
{
error!("Error occurred when pushing request. {:?}", err);
}
}
}
debug!("Push done.");
}
_ => {}
}
if let Some(manager) = manager {
let mut lock = manager.lock().await;
lock.register(addr);
}
}
#[cfg(test)]
mod tests {
use super::*;
#[tokio::test]
async fn run() {
let mut extensions = Extensions::new();
mount(&mut extensions, SmartPush::default());
let _server = kvarn_testing::ServerBuilder::from(extensions).run().await;
}
#[test]
fn exclusive() {
let mut extensions = new();
extensions.add_post(Box::new(always), Id::new(-32, "HTTP/2 push"));
let debug = format!("{extensions:?}");
assert_eq!(debug.match_indices("push").count(), 1);
mount(&mut extensions, SmartPush::default());
assert_eq!(debug.match_indices("push").count(), 1);
}
}