mirror of
https://github.com/fafhrd91/actix-net
synced 2025-02-20 07:40:33 +01:00
Fixed unsoundness in .and_then()/.then() service combinators
This commit is contained in:
parent
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commit
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@ -1,5 +1,11 @@
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# Changes
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## [1.0.5] - 2020-01-16
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### Fixed
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* Fixed unsoundness in .and_then()/.then() service combinators
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## [1.0.4] - 2020-01-15
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### Fixed
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@ -1,6 +1,6 @@
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[package]
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name = "actix-service"
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version = "1.0.4"
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version = "1.0.5"
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authors = ["Nikolay Kim <fafhrd91@gmail.com>"]
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description = "Actix service"
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keywords = ["network", "framework", "async", "futures"]
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@ -1,5 +1,6 @@
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use std::future::Future;
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use std::pin::Pin;
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use std::rc::Rc;
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use std::task::{Context, Poll};
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use super::{Service, ServiceFactory};
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@ -9,7 +10,7 @@ use crate::cell::Cell;
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/// of another service which completes successfully.
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///
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/// This is created by the `ServiceExt::and_then` method.
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pub struct AndThenService<A, B>(Cell<A>, Cell<B>);
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pub(crate) struct AndThenService<A, B>(Cell<(A, B)>);
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impl<A, B> AndThenService<A, B> {
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/// Create new `AndThen` combinator
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@ -18,13 +19,13 @@ impl<A, B> AndThenService<A, B> {
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A: Service,
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B: Service<Request = A::Response, Error = A::Error>,
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{
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Self(Cell::new(a), Cell::new(b))
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Self(Cell::new((a, b)))
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}
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}
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impl<A, B> Clone for AndThenService<A, B> {
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fn clone(&self) -> Self {
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AndThenService(self.0.clone(), self.1.clone())
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AndThenService(self.0.clone())
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}
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}
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@ -39,8 +40,9 @@ where
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type Future = AndThenServiceResponse<A, B>;
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fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
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let not_ready = { !self.0.get_mut().poll_ready(cx)?.is_ready() };
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if !self.1.poll_ready(cx)?.is_ready() || not_ready {
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let srv = self.0.get_mut();
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let not_ready = !srv.0.poll_ready(cx)?.is_ready();
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if !srv.1.poll_ready(cx)?.is_ready() || not_ready {
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Poll::Pending
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} else {
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Poll::Ready(Ok(()))
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@ -49,13 +51,13 @@ where
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fn call(&mut self, req: A::Request) -> Self::Future {
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AndThenServiceResponse {
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state: State::A(self.0.get_mut().call(req), Some(self.1.clone())),
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state: State::A(self.0.get_mut().0.call(req), Some(self.0.clone())),
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}
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}
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}
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#[pin_project::pin_project]
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pub struct AndThenServiceResponse<A, B>
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pub(crate) struct AndThenServiceResponse<A, B>
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where
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A: Service,
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B: Service<Request = A::Response, Error = A::Error>,
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@ -70,7 +72,7 @@ where
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A: Service,
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B: Service<Request = A::Response, Error = A::Error>,
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{
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A(#[pin] A::Future, Option<Cell<B>>),
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A(#[pin] A::Future, Option<Cell<(A, B)>>),
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B(#[pin] B::Future),
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Empty,
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}
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@ -92,7 +94,7 @@ where
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Poll::Ready(res) => {
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let mut b = b.take().unwrap();
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this.state.set(State::Empty); // drop fut A
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let fut = b.get_mut().call(res);
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let fut = b.get_mut().1.call(res);
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this.state.set(State::B(fut));
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self.poll(cx)
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}
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@ -108,7 +110,7 @@ where
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}
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/// `.and_then()` service factory combinator
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pub struct AndThenServiceFactory<A, B>
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pub(crate) struct AndThenServiceFactory<A, B>
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where
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A: ServiceFactory,
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A::Config: Clone,
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@ -119,8 +121,7 @@ where
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InitError = A::InitError,
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>,
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{
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a: A,
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b: B,
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inner: Rc<(A, B)>,
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}
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impl<A, B> AndThenServiceFactory<A, B>
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@ -136,7 +137,9 @@ where
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{
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/// Create new `AndThenFactory` combinator
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pub(crate) fn new(a: A, b: B) -> Self {
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Self { a, b }
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Self {
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inner: Rc::new((a, b)),
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}
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}
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}
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@ -161,34 +164,34 @@ where
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type Future = AndThenServiceFactoryResponse<A, B>;
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fn new_service(&self, cfg: A::Config) -> Self::Future {
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let inner = &*self.inner;
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AndThenServiceFactoryResponse::new(
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self.a.new_service(cfg.clone()),
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self.b.new_service(cfg),
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inner.0.new_service(cfg.clone()),
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inner.1.new_service(cfg),
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)
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}
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}
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impl<A, B> Clone for AndThenServiceFactory<A, B>
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where
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A: ServiceFactory + Clone,
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A: ServiceFactory,
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A::Config: Clone,
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B: ServiceFactory<
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Config = A::Config,
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Request = A::Response,
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Error = A::Error,
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InitError = A::InitError,
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> + Clone,
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Config = A::Config,
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Request = A::Response,
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Error = A::Error,
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InitError = A::InitError,
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>,
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{
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fn clone(&self) -> Self {
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Self {
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a: self.a.clone(),
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b: self.b.clone(),
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inner: self.inner.clone(),
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}
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}
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}
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#[pin_project::pin_project]
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pub struct AndThenServiceFactoryResponse<A, B>
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pub(crate) struct AndThenServiceFactoryResponse<A, B>
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where
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A: ServiceFactory,
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B: ServiceFactory<Request = A::Response>,
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@ -1,13 +1,14 @@
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use std::future::Future;
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use std::marker::PhantomData;
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use std::pin::Pin;
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use std::rc::Rc;
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use std::task::{Context, Poll};
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use crate::cell::Cell;
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use crate::{Service, ServiceFactory};
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/// `Apply` service combinator
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pub struct AndThenApplyFn<A, B, F, Fut, Res, Err>
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pub(crate) struct AndThenApplyFn<A, B, F, Fut, Res, Err>
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where
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A: Service,
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B: Service,
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@ -15,8 +16,7 @@ where
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Fut: Future<Output = Result<Res, Err>>,
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Err: From<A::Error> + From<B::Error>,
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{
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a: A,
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b: Cell<(B, F)>,
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srv: Cell<(A, B, F)>,
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r: PhantomData<(Fut, Res, Err)>,
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}
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@ -31,8 +31,7 @@ where
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/// Create new `Apply` combinator
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pub(crate) fn new(a: A, b: B, f: F) -> Self {
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Self {
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a,
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b: Cell::new((b, f)),
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srv: Cell::new((a, b, f)),
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r: PhantomData,
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}
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}
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@ -40,7 +39,7 @@ where
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impl<A, B, F, Fut, Res, Err> Clone for AndThenApplyFn<A, B, F, Fut, Res, Err>
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where
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A: Service + Clone,
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A: Service,
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B: Service,
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F: FnMut(A::Response, &mut B) -> Fut,
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Fut: Future<Output = Result<Res, Err>>,
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@ -48,8 +47,7 @@ where
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{
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fn clone(&self) -> Self {
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AndThenApplyFn {
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a: self.a.clone(),
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b: self.b.clone(),
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srv: self.srv.clone(),
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r: PhantomData,
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}
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}
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@ -69,8 +67,9 @@ where
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type Future = AndThenApplyFnFuture<A, B, F, Fut, Res, Err>;
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fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
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let not_ready = self.a.poll_ready(cx)?.is_pending();
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if self.b.get_mut().0.poll_ready(cx)?.is_pending() || not_ready {
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let inner = self.srv.get_mut();
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let not_ready = inner.0.poll_ready(cx)?.is_pending();
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if inner.1.poll_ready(cx)?.is_pending() || not_ready {
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Poll::Pending
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} else {
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Poll::Ready(Ok(()))
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@ -78,14 +77,15 @@ where
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}
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fn call(&mut self, req: A::Request) -> Self::Future {
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let fut = self.srv.get_mut().0.call(req);
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AndThenApplyFnFuture {
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state: State::A(self.a.call(req), Some(self.b.clone())),
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state: State::A(fut, Some(self.srv.clone())),
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}
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}
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}
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#[pin_project::pin_project]
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pub struct AndThenApplyFnFuture<A, B, F, Fut, Res, Err>
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pub(crate) struct AndThenApplyFnFuture<A, B, F, Fut, Res, Err>
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where
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A: Service,
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B: Service,
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@ -108,7 +108,7 @@ where
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Err: From<A::Error>,
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Err: From<B::Error>,
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{
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A(#[pin] A::Future, Option<Cell<(B, F)>>),
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A(#[pin] A::Future, Option<Cell<(A, B, F)>>),
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B(#[pin] Fut),
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Empty,
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}
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@ -134,7 +134,7 @@ where
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let mut b = b.take().unwrap();
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this.state.set(State::Empty);
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let b = b.get_mut();
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let fut = (&mut b.1)(res, &mut b.0);
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let fut = (&mut b.2)(res, &mut b.1);
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this.state.set(State::B(fut));
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self.poll(cx)
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}
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@ -150,10 +150,8 @@ where
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}
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/// `AndThenApplyFn` service factory
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pub struct AndThenApplyFnFactory<A, B, F, Fut, Res, Err> {
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a: A,
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b: B,
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f: F,
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pub(crate) struct AndThenApplyFnFactory<A, B, F, Fut, Res, Err> {
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srv: Rc<(A, B, F)>,
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r: PhantomData<(Fut, Res, Err)>,
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}
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@ -168,25 +166,16 @@ where
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/// Create new `ApplyNewService` new service instance
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pub(crate) fn new(a: A, b: B, f: F) -> Self {
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Self {
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a: a,
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b: b,
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f: f,
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srv: Rc::new((a, b, f)),
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r: PhantomData,
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}
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}
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}
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impl<A, B, F, Fut, Res, Err> Clone for AndThenApplyFnFactory<A, B, F, Fut, Res, Err>
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where
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A: Clone,
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B: Clone,
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F: Clone,
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{
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impl<A, B, F, Fut, Res, Err> Clone for AndThenApplyFnFactory<A, B, F, Fut, Res, Err> {
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fn clone(&self) -> Self {
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Self {
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a: self.a.clone(),
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b: self.b.clone(),
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f: self.f.clone(),
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srv: self.srv.clone(),
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r: PhantomData,
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}
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}
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@ -210,18 +199,19 @@ where
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type Future = AndThenApplyFnFactoryResponse<A, B, F, Fut, Res, Err>;
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fn new_service(&self, cfg: A::Config) -> Self::Future {
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let srv = &*self.srv;
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AndThenApplyFnFactoryResponse {
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a: None,
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b: None,
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f: self.f.clone(),
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fut_a: self.a.new_service(cfg.clone()),
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fut_b: self.b.new_service(cfg),
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f: srv.2.clone(),
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fut_a: srv.0.new_service(cfg.clone()),
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fut_b: srv.1.new_service(cfg),
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}
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}
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}
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#[pin_project::pin_project]
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pub struct AndThenApplyFnFactoryResponse<A, B, F, Fut, Res, Err>
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pub(crate) struct AndThenApplyFnFactoryResponse<A, B, F, Fut, Res, Err>
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where
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A: ServiceFactory,
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B: ServiceFactory<Config = A::Config, InitError = A::InitError>,
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@ -267,8 +257,11 @@ where
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if this.a.is_some() && this.b.is_some() {
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Poll::Ready(Ok(AndThenApplyFn {
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a: this.a.take().unwrap(),
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b: Cell::new((this.b.take().unwrap(), this.f.clone())),
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srv: Cell::new((
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this.a.take().unwrap(),
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this.b.take().unwrap(),
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this.f.clone(),
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)),
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r: PhantomData,
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}))
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} else {
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|
@ -7,7 +7,18 @@ use crate::cell::Cell;
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use crate::{Service, ServiceFactory};
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/// Convert `Fn(Config, &mut Service1) -> Future<Service2>` fn to a service factory
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pub fn apply_cfg<F, C, T, R, S, E>(srv: T, f: F) -> ApplyConfigService<F, C, T, R, S, E>
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pub fn apply_cfg<F, C, T, R, S, E>(
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srv: T,
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f: F,
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) -> impl ServiceFactory<
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Config = C,
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Request = S::Request,
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Response = S::Response,
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Error = S::Error,
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Service = S,
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InitError = E,
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Future = R,
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> + Clone
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where
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F: FnMut(C, &mut T) -> R,
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T: Service,
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@ -26,7 +37,14 @@ where
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pub fn apply_cfg_factory<F, C, T, R, S>(
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factory: T,
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f: F,
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) -> ApplyConfigServiceFactory<F, C, T, R, S>
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) -> impl ServiceFactory<
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Config = C,
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Request = S::Request,
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Response = S::Response,
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Error = S::Error,
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Service = S,
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InitError = T::InitError,
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> + Clone
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where
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F: FnMut(C, &mut T::Service) -> R,
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T: ServiceFactory<Config = ()>,
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@ -41,7 +59,7 @@ where
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}
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/// Convert `Fn(Config, &mut Server) -> Future<Service>` fn to NewService\
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pub struct ApplyConfigService<F, C, T, R, S, E>
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struct ApplyConfigService<F, C, T, R, S, E>
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where
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F: FnMut(C, &mut T) -> R,
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T: Service,
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@ -92,7 +110,7 @@ where
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}
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/// Convert `Fn(&Config) -> Future<Service>` fn to NewService
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pub struct ApplyConfigServiceFactory<F, C, T, R, S>
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struct ApplyConfigServiceFactory<F, C, T, R, S>
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where
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F: FnMut(C, &mut T::Service) -> R,
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T: ServiceFactory<Config = ()>,
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@ -145,7 +163,7 @@ where
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}
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#[pin_project::pin_project]
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pub struct ApplyConfigServiceFactoryResponse<F, C, T, R, S>
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struct ApplyConfigServiceFactoryResponse<F, C, T, R, S>
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where
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F: FnMut(C, &mut T::Service) -> R,
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T: ServiceFactory<Config = ()>,
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|
@ -361,10 +361,7 @@ where
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}
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pub mod dev {
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pub use crate::and_then::{AndThenService, AndThenServiceFactory};
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pub use crate::and_then_apply_fn::{AndThenApplyFn, AndThenApplyFnFactory};
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pub use crate::apply::{Apply, ApplyServiceFactory};
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pub use crate::apply_cfg::{ApplyConfigService, ApplyConfigServiceFactory};
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pub use crate::fn_service::{
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FnService, FnServiceConfig, FnServiceFactory, FnServiceNoConfig,
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};
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@ -372,7 +369,6 @@ pub mod dev {
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pub use crate::map_config::{MapConfig, UnitConfig};
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pub use crate::map_err::{MapErr, MapErrServiceFactory};
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pub use crate::map_init_err::MapInitErr;
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pub use crate::then::{ThenService, ThenServiceFactory};
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pub use crate::transform::ApplyTransform;
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pub use crate::transform_err::TransformMapInitErr;
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}
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|
@ -46,7 +46,12 @@ impl<T: Service> Pipeline<T> {
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///
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/// Note that this function consumes the receiving service and returns a
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/// wrapped version of it.
|
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pub fn and_then<F, U>(self, service: F) -> Pipeline<AndThenService<T, U>>
|
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pub fn and_then<F, U>(
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self,
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service: F,
|
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) -> Pipeline<
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impl Service<Request = T::Request, Response = U::Response, Error = T::Error> + Clone,
|
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>
|
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where
|
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Self: Sized,
|
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F: IntoService<U>,
|
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@ -65,7 +70,7 @@ impl<T: Service> Pipeline<T> {
|
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self,
|
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service: I,
|
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f: F,
|
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) -> Pipeline<AndThenApplyFn<T, U, F, Fut, Res, Err>>
|
||||
) -> Pipeline<impl Service<Request = T::Request, Response = Res, Error = Err> + Clone>
|
||||
where
|
||||
Self: Sized,
|
||||
I: IntoService<U>,
|
||||
@ -84,7 +89,12 @@ impl<T: Service> Pipeline<T> {
|
||||
///
|
||||
/// Note that this function consumes the receiving pipeline and returns a
|
||||
/// wrapped version of it.
|
||||
pub fn then<F, U>(self, service: F) -> Pipeline<ThenService<T, U>>
|
||||
pub fn then<F, U>(
|
||||
self,
|
||||
service: F,
|
||||
) -> Pipeline<
|
||||
impl Service<Request = T::Request, Response = U::Response, Error = T::Error> + Clone,
|
||||
>
|
||||
where
|
||||
Self: Sized,
|
||||
F: IntoService<U>,
|
||||
@ -168,7 +178,23 @@ pub struct PipelineFactory<T> {
|
||||
|
||||
impl<T: ServiceFactory> PipelineFactory<T> {
|
||||
/// Call another service after call to this one has resolved successfully.
|
||||
pub fn and_then<F, U>(self, factory: F) -> PipelineFactory<AndThenServiceFactory<T, U>>
|
||||
pub fn and_then<F, U>(
|
||||
self,
|
||||
factory: F,
|
||||
) -> PipelineFactory<
|
||||
impl ServiceFactory<
|
||||
Request = T::Request,
|
||||
Response = U::Response,
|
||||
Error = T::Error,
|
||||
Config = T::Config,
|
||||
InitError = T::InitError,
|
||||
Service = impl Service<
|
||||
Request = T::Request,
|
||||
Response = U::Response,
|
||||
Error = T::Error,
|
||||
> + Clone,
|
||||
> + Clone,
|
||||
>
|
||||
where
|
||||
Self: Sized,
|
||||
T::Config: Clone,
|
||||
@ -193,7 +219,16 @@ impl<T: ServiceFactory> PipelineFactory<T> {
|
||||
self,
|
||||
factory: I,
|
||||
f: F,
|
||||
) -> PipelineFactory<AndThenApplyFnFactory<T, U, F, Fut, Res, Err>>
|
||||
) -> PipelineFactory<
|
||||
impl ServiceFactory<
|
||||
Request = T::Request,
|
||||
Response = Res,
|
||||
Error = Err,
|
||||
Config = T::Config,
|
||||
InitError = T::InitError,
|
||||
Service = impl Service<Request = T::Request, Response = Res, Error = Err> + Clone,
|
||||
> + Clone,
|
||||
>
|
||||
where
|
||||
Self: Sized,
|
||||
T::Config: Clone,
|
||||
@ -214,7 +249,23 @@ impl<T: ServiceFactory> PipelineFactory<T> {
|
||||
///
|
||||
/// Note that this function consumes the receiving pipeline and returns a
|
||||
/// wrapped version of it.
|
||||
pub fn then<F, U>(self, factory: F) -> PipelineFactory<ThenServiceFactory<T, U>>
|
||||
pub fn then<F, U>(
|
||||
self,
|
||||
factory: F,
|
||||
) -> PipelineFactory<
|
||||
impl ServiceFactory<
|
||||
Request = T::Request,
|
||||
Response = U::Response,
|
||||
Error = T::Error,
|
||||
Config = T::Config,
|
||||
InitError = T::InitError,
|
||||
Service = impl Service<
|
||||
Request = T::Request,
|
||||
Response = U::Response,
|
||||
Error = T::Error,
|
||||
> + Clone,
|
||||
> + Clone,
|
||||
>
|
||||
where
|
||||
Self: Sized,
|
||||
T::Config: Clone,
|
||||
|
@ -1,5 +1,6 @@
|
||||
use std::future::Future;
|
||||
use std::pin::Pin;
|
||||
use std::rc::Rc;
|
||||
use std::task::{Context, Poll};
|
||||
|
||||
use super::{Service, ServiceFactory};
|
||||
@ -8,11 +9,8 @@ use crate::cell::Cell;
|
||||
/// Service for the `then` combinator, chaining a computation onto the end of
|
||||
/// another service.
|
||||
///
|
||||
/// This is created by the `ServiceExt::then` method.
|
||||
pub struct ThenService<A, B> {
|
||||
a: A,
|
||||
b: Cell<B>,
|
||||
}
|
||||
/// This is created by the `Pipeline::then` method.
|
||||
pub(crate) struct ThenService<A, B>(Cell<(A, B)>);
|
||||
|
||||
impl<A, B> ThenService<A, B> {
|
||||
/// Create new `.then()` combinator
|
||||
@ -21,19 +19,13 @@ impl<A, B> ThenService<A, B> {
|
||||
A: Service,
|
||||
B: Service<Request = Result<A::Response, A::Error>, Error = A::Error>,
|
||||
{
|
||||
Self { a, b: Cell::new(b) }
|
||||
Self(Cell::new((a, b)))
|
||||
}
|
||||
}
|
||||
|
||||
impl<A, B> Clone for ThenService<A, B>
|
||||
where
|
||||
A: Clone,
|
||||
{
|
||||
impl<A, B> Clone for ThenService<A, B> {
|
||||
fn clone(&self) -> Self {
|
||||
ThenService {
|
||||
a: self.a.clone(),
|
||||
b: self.b.clone(),
|
||||
}
|
||||
ThenService(self.0.clone())
|
||||
}
|
||||
}
|
||||
|
||||
@ -47,9 +39,10 @@ where
|
||||
type Error = B::Error;
|
||||
type Future = ThenServiceResponse<A, B>;
|
||||
|
||||
fn poll_ready(&mut self, ctx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
|
||||
let not_ready = !self.a.poll_ready(ctx)?.is_ready();
|
||||
if !self.b.get_mut().poll_ready(ctx)?.is_ready() || not_ready {
|
||||
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
|
||||
let srv = self.0.get_mut();
|
||||
let not_ready = !srv.0.poll_ready(cx)?.is_ready();
|
||||
if !srv.1.poll_ready(cx)?.is_ready() || not_ready {
|
||||
Poll::Pending
|
||||
} else {
|
||||
Poll::Ready(Ok(()))
|
||||
@ -58,13 +51,13 @@ where
|
||||
|
||||
fn call(&mut self, req: A::Request) -> Self::Future {
|
||||
ThenServiceResponse {
|
||||
state: State::A(self.a.call(req), Some(self.b.clone())),
|
||||
state: State::A(self.0.get_mut().0.call(req), Some(self.0.clone())),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[pin_project::pin_project]
|
||||
pub struct ThenServiceResponse<A, B>
|
||||
pub(crate) struct ThenServiceResponse<A, B>
|
||||
where
|
||||
A: Service,
|
||||
B: Service<Request = Result<A::Response, A::Error>>,
|
||||
@ -79,7 +72,7 @@ where
|
||||
A: Service,
|
||||
B: Service<Request = Result<A::Response, A::Error>>,
|
||||
{
|
||||
A(#[pin] A::Future, Option<Cell<B>>),
|
||||
A(#[pin] A::Future, Option<Cell<(A, B)>>),
|
||||
B(#[pin] B::Future),
|
||||
Empty,
|
||||
}
|
||||
@ -101,7 +94,7 @@ where
|
||||
Poll::Ready(res) => {
|
||||
let mut b = b.take().unwrap();
|
||||
this.state.set(State::Empty); // drop fut A
|
||||
let fut = b.get_mut().call(res);
|
||||
let fut = b.get_mut().1.call(res);
|
||||
this.state.set(State::B(fut));
|
||||
self.poll(cx)
|
||||
}
|
||||
@ -117,10 +110,7 @@ where
|
||||
}
|
||||
|
||||
/// `.then()` service factory combinator
|
||||
pub struct ThenServiceFactory<A, B> {
|
||||
a: A,
|
||||
b: B,
|
||||
}
|
||||
pub(crate) struct ThenServiceFactory<A, B>(Rc<(A, B)>);
|
||||
|
||||
impl<A, B> ThenServiceFactory<A, B>
|
||||
where
|
||||
@ -135,7 +125,7 @@ where
|
||||
{
|
||||
/// Create new `AndThen` combinator
|
||||
pub(crate) fn new(a: A, b: B) -> Self {
|
||||
Self { a, b }
|
||||
Self(Rc::new((a, b)))
|
||||
}
|
||||
}
|
||||
|
||||
@ -160,28 +150,19 @@ where
|
||||
type Future = ThenServiceFactoryResponse<A, B>;
|
||||
|
||||
fn new_service(&self, cfg: A::Config) -> Self::Future {
|
||||
ThenServiceFactoryResponse::new(
|
||||
self.a.new_service(cfg.clone()),
|
||||
self.b.new_service(cfg),
|
||||
)
|
||||
let srv = &*self.0;
|
||||
ThenServiceFactoryResponse::new(srv.0.new_service(cfg.clone()), srv.1.new_service(cfg))
|
||||
}
|
||||
}
|
||||
|
||||
impl<A, B> Clone for ThenServiceFactory<A, B>
|
||||
where
|
||||
A: Clone,
|
||||
B: Clone,
|
||||
{
|
||||
impl<A, B> Clone for ThenServiceFactory<A, B> {
|
||||
fn clone(&self) -> Self {
|
||||
Self {
|
||||
a: self.a.clone(),
|
||||
b: self.b.clone(),
|
||||
}
|
||||
Self(self.0.clone())
|
||||
}
|
||||
}
|
||||
|
||||
#[pin_project::pin_project]
|
||||
pub struct ThenServiceFactoryResponse<A, B>
|
||||
pub(crate) struct ThenServiceFactoryResponse<A, B>
|
||||
where
|
||||
A: ServiceFactory,
|
||||
B: ServiceFactory<
|
||||
|
Loading…
x
Reference in New Issue
Block a user