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use std::task::{Context, Poll};
use std::{future::Future, pin::Pin, rc::Rc};
use ntex::router::{IntoPattern, RouterBuilder};
use ntex::service::boxed::{self, BoxService, BoxServiceFactory};
use ntex::service::{IntoServiceFactory, Service, ServiceFactory};
use super::publish::Publish;
type Handler<S, E> = BoxServiceFactory<S, Publish, (), E, E>;
type HandlerService<E> = BoxService<Publish, (), 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, Publish, S>,
U: ServiceFactory<Publish, S, Response = (), 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, Publish, S>,
U: ServiceFactory<Publish, S, Response = (), 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>, Publish, S> for Router<S, Err>
where
S: Clone + 'static,
Err: 'static,
{
fn into_factory(self) -> RouterFactory<S, Err> {
RouterFactory {
router: Rc::new(self.router.finish()),
handlers: self.handlers,
default: self.default,
}
}
}
pub struct RouterFactory<S, Err> {
router: Rc<ntex::router::Router<usize>>,
handlers: Vec<Handler<S, Err>>,
default: Handler<S, Err>,
}
impl<S, Err> ServiceFactory<Publish, S> for RouterFactory<S, Err>
where
S: Clone + 'static,
Err: 'static,
{
type Response = ();
type Error = Err;
type InitError = Err;
type Service = RouterService<Err>;
type Future = Pin<Box<dyn Future<Output = Result<RouterService<Err>, Err>>>>;
fn new_service(&self, session: S) -> Self::Future {
let fut: Vec<_> =
self.handlers.iter().map(|h| h.new_service(session.clone())).collect();
let default_fut = self.default.new_service(session);
let router = self.router.clone();
Box::pin(async move {
let mut handlers = Vec::new();
for handler in fut {
handlers.push(handler.await?);
}
Ok(RouterService { router, handlers, default: default_fut.await? })
})
}
}
pub struct RouterService<Err> {
router: Rc<ntex::router::Router<usize>>,
handlers: Vec<HandlerService<Err>>,
default: HandlerService<Err>,
}
impl<Err> Service<Publish> for RouterService<Err> {
type Response = ();
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.handlers {
if hnd.poll_ready(cx)?.is_pending() {
not_ready = true;
}
}
if self.default.poll_ready(cx)?.is_pending() {
not_ready = true;
}
if not_ready {
Poll::Pending
} else {
Poll::Ready(Ok(()))
}
}
fn call(&self, mut req: Publish) -> Self::Future {
if let Some((idx, _info)) = self.router.recognize(req.topic_mut()) {
self.handlers[*idx].call(req)
} else {
self.default.call(req)
}
}
}