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use std::task::{Context, Poll};
use std::{cell::Cell, cell::RefCell, future::Future, num::NonZeroU16, pin::Pin, rc::Rc};
use ntex::router::{IntoPattern, Path, RouterBuilder};
use ntex::service::boxed::{self, BoxService, BoxServiceFactory};
use ntex::service::{IntoServiceFactory, Service, ServiceFactory};
use ntex::task::LocalWaker;
use ntex::util::{ByteString, HashMap};
use super::publish::{Publish, PublishAck};
type Handler<S, E> = BoxServiceFactory<S, Publish, PublishAck, E, E>;
type HandlerService<E> = BoxService<Publish, PublishAck, E>;
pub struct Router<S, Err> {
router: RouterBuilder<usize>,
handlers: Vec<Handler<S, Err>>,
default: Handler<S, Err>,
}
impl<S, Err> Router<S, Err>
where
S: Clone + 'static,
Err: 'static,
{
pub fn new<F, U: 'static>(default_service: F) -> Self
where
F: IntoServiceFactory<U>,
U: ServiceFactory<
Config = S,
Request = Publish,
Response = PublishAck,
Error = Err,
InitError = Err,
>,
{
Router {
router: ntex::router::Router::build(),
handlers: Vec::new(),
default: boxed::factory(default_service.into_factory()),
}
}
pub fn resource<T, F, U: 'static>(mut self, address: T, service: F) -> Self
where
T: IntoPattern,
F: IntoServiceFactory<U>,
U: ServiceFactory<Config = S, Request = Publish, Response = PublishAck, Error = Err>,
Err: From<U::InitError>,
{
self.router.path(address, self.handlers.len());
self.handlers.push(boxed::factory(service.into_factory().map_init_err(Err::from)));
self
}
}
impl<S, Err> IntoServiceFactory<RouterFactory<S, Err>> for Router<S, Err>
where
S: Clone + 'static,
Err: 'static,
{
fn into_factory(self) -> RouterFactory<S, Err> {
RouterFactory {
router: self.router.finish(),
handlers: Rc::new(self.handlers),
default: self.default,
}
}
}
pub struct RouterFactory<S, Err> {
router: ntex::router::Router<usize>,
handlers: Rc<Vec<Handler<S, Err>>>,
default: Handler<S, Err>,
}
impl<S, Err> ServiceFactory for RouterFactory<S, Err>
where
S: Clone + 'static,
Err: 'static,
{
type Config = S;
type Request = Publish;
type Response = PublishAck;
type Error = Err;
type InitError = Err;
type Service = RouterService<S, Err>;
type Future = Pin<Box<dyn Future<Output = Result<Self::Service, Err>>>>;
fn new_service(&self, session: S) -> Self::Future {
let router = self.router.clone();
let factories = self.handlers.clone();
let default_fut = self.default.new_service(session.clone());
Box::pin(async move {
let default = default_fut.await?;
let handlers = (0..factories.len()).map(|_| None).collect();
Ok(RouterService {
router,
default,
inner: Rc::new(Inner {
session,
factories,
handlers: RefCell::new(handlers),
creating: Cell::new(false),
aliases: RefCell::new(HashMap::default()),
waker: LocalWaker::new(),
}),
})
})
}
}
pub struct RouterService<S, Err> {
inner: Rc<Inner<S, Err>>,
router: ntex::router::Router<usize>,
default: HandlerService<Err>,
}
struct Inner<S, Err> {
session: S,
handlers: RefCell<Vec<Option<HandlerService<Err>>>>,
factories: Rc<Vec<Handler<S, Err>>>,
aliases: RefCell<HashMap<NonZeroU16, (usize, Path<ByteString>)>>,
waker: LocalWaker,
creating: Cell<bool>,
}
impl<S: Clone + 'static, Err: 'static> RouterService<S, Err> {
fn create_handler(
&self,
idx: usize,
req: Publish,
) -> Pin<Box<dyn Future<Output = Result<PublishAck, Err>>>> {
let inner = self.inner.clone();
inner.creating.set(true);
Box::pin(async move {
let handler = inner.factories[idx].new_service(inner.session.clone()).await?;
if let Err(e) = crate::utils::ready(&handler).await {
inner.waker.wake();
inner.creating.set(false);
return Err(e);
}
let fut = handler.call(req);
inner.waker.wake();
inner.creating.set(false);
inner.handlers.borrow_mut()[idx] = Some(handler);
fut.await
})
}
}
impl<S: Clone + 'static, Err: 'static> Service for RouterService<S, Err> {
type Request = Publish;
type Response = PublishAck;
type Error = Err;
type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>>>>;
fn poll_ready(&self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
let mut not_ready = false;
for hnd in (*self.inner.handlers.borrow()).iter().flatten() {
if hnd.poll_ready(cx)?.is_pending() {
not_ready = true;
}
}
if self.default.poll_ready(cx)?.is_pending() {
not_ready = true;
}
if self.inner.creating.get() {
self.inner.waker.register(cx.waker());
return Poll::Pending;
}
if not_ready {
Poll::Pending
} else {
Poll::Ready(Ok(()))
}
}
fn call(&self, mut req: Self::Request) -> Self::Future {
if !req.publish_topic().is_empty() {
if let Some((idx, _info)) = self.router.recognize(req.topic_mut()) {
if let Some(alias) = req.packet().properties.topic_alias {
self.inner.aliases.borrow_mut().insert(alias, (*idx, req.topic().clone()));
}
if let Some(hnd) = &self.inner.handlers.borrow()[*idx] {
return hnd.call(req);
} else {
return self.create_handler(*idx, req);
}
}
}
else if let Some(ref alias) = req.packet().properties.topic_alias {
let aliases = self.inner.aliases.borrow();
if let Some(item) = aliases.get(alias) {
*req.topic_mut() = item.1.clone();
if let Some(hnd) = &self.inner.handlers.borrow()[item.0] {
return hnd.call(req);
} else {
return self.create_handler(item.0, req);
}
} else {
log::error!("Unknown topic alias: {:?}", alias);
}
}
self.default.call(req)
}
}