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use derive_new::new; use educe::Educe; use futures::{ready, Stream}; use pin_project::pin_project; use serde::{Deserialize, Serialize}; use std::{ future::Future, marker::PhantomData, pin::Pin, task::{Context, Poll} }; use super::{ DistributedPipe, DistributedSink, ParallelPipe, ParallelSink, Reducer, ReducerAsync, ReducerProcessSend, ReducerSend }; use crate::{pipe::Sink, pool::ProcessSend}; #[derive(new)] #[must_use] pub struct Any<I, F> { i: I, f: F, } impl<I: ParallelPipe<Source>, Source, F> ParallelSink<Source> for Any<I, F> where F: FnMut(I::Item) -> bool + Clone + Send + 'static, { type Output = bool; type Pipe = I; type ReduceA = AnyReducer<I::Item, F>; type ReduceC = BoolOrReducer; fn reducers(self) -> (Self::Pipe, Self::ReduceA, Self::ReduceC) { (self.i, AnyReducer(self.f, PhantomData), BoolOrReducer) } } impl<I: DistributedPipe<Source>, Source, F> DistributedSink<Source> for Any<I, F> where F: FnMut(I::Item) -> bool + Clone + ProcessSend + 'static, { type Output = bool; type Pipe = I; type ReduceA = AnyReducer<I::Item, F>; type ReduceB = BoolOrReducer; type ReduceC = BoolOrReducer; fn reducers(self) -> (Self::Pipe, Self::ReduceA, Self::ReduceB, Self::ReduceC) { ( self.i, AnyReducer(self.f, PhantomData), BoolOrReducer, BoolOrReducer, ) } } #[derive(Educe, Serialize, Deserialize)] #[educe(Clone(bound = "F: Clone"))] #[serde( bound(serialize = "F: Serialize"), bound(deserialize = "F: Deserialize<'de>") )] pub struct AnyReducer<A, F>(F, PhantomData<fn() -> A>); impl<A, F> Reducer<A> for AnyReducer<A, F> where F: FnMut(A) -> bool, { type Output = bool; type Async = AnyReducerAsync<A, F>; fn into_async(self) -> Self::Async { AnyReducerAsync(self.0, true, PhantomData) } } impl<A, F> ReducerProcessSend<A> for AnyReducer<A, F> where F: FnMut(A) -> bool, { type Output = bool; } impl<A, F> ReducerSend<A> for AnyReducer<A, F> where F: FnMut(A) -> bool, { type Output = bool; } #[pin_project] #[derive(Serialize, Deserialize)] #[serde( bound(serialize = "F: Serialize"), bound(deserialize = "F: Deserialize<'de>") )] pub struct AnyReducerAsync<A, F>(F, bool, PhantomData<fn() -> A>); impl<A, F> Sink<A> for AnyReducerAsync<A, F> where F: FnMut(A) -> bool, { #[inline(always)] fn poll_pipe( self: Pin<&mut Self>, cx: &mut Context, mut stream: Pin<&mut impl Stream<Item = A>>, ) -> Poll<()> { let self_ = self.project(); while *self_.1 { if let Some(item) = ready!(stream.as_mut().poll_next(cx)) { *self_.1 = *self_.1 && !self_.0(item); } else { break; } } Poll::Ready(()) } } impl<A, F> ReducerAsync<A> for AnyReducerAsync<A, F> where F: FnMut(A) -> bool, { type Output = bool; fn output<'a>(self: Pin<&'a mut Self>) -> Pin<Box<dyn Future<Output = Self::Output> + 'a>> { Box::pin(async move { !self.1 }) } } #[derive(Clone, Serialize, Deserialize)] pub struct BoolOrReducer; impl Reducer<bool> for BoolOrReducer { type Output = bool; type Async = BoolOrReducerAsync; fn into_async(self) -> Self::Async { BoolOrReducerAsync(true) } } impl ReducerProcessSend<bool> for BoolOrReducer { type Output = bool; } impl ReducerSend<bool> for BoolOrReducer { type Output = bool; } #[pin_project] #[derive(Serialize, Deserialize)] pub struct BoolOrReducerAsync(bool); impl Sink<bool> for BoolOrReducerAsync { #[inline(always)] fn poll_pipe( mut self: Pin<&mut Self>, cx: &mut Context, mut stream: Pin<&mut impl Stream<Item = bool>>, ) -> Poll<()> { while self.0 { if let Some(item) = ready!(stream.as_mut().poll_next(cx)) { self.0 = self.0 && !item; } else { break; } } Poll::Ready(()) } } impl ReducerAsync<bool> for BoolOrReducerAsync { type Output = bool; fn output<'a>(self: Pin<&'a mut Self>) -> Pin<Box<dyn Future<Output = Self::Output> + 'a>> { Box::pin(async move { !self.0 }) } }