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use derive_new::new; use futures::Stream; use pin_project::pin_project; use serde::{Deserialize, Serialize}; use std::{ pin::Pin, task::{Context, Poll} }; use super::{ParallelPipe, ParallelStream, PipeTask, StreamTask}; use crate::pipe::Pipe; #[derive(new)] #[must_use] pub struct Update<I, F> { i: I, f: F, } impl_par_dist! { impl<I: ParallelStream, F> ParallelStream for Update<I, F> where F: FnMut(&mut I::Item) + Clone + Send + 'static, { type Item = I::Item; type Task = UpdateTask<I::Task, F>; fn size_hint(&self) -> (usize, Option<usize>) { self.i.size_hint() } fn next_task(&mut self) -> Option<Self::Task> { self.i.next_task().map(|task| { let f = self.f.clone(); UpdateTask { task, f } }) } } impl<I: ParallelPipe<Source>, F, Source> ParallelPipe<Source> for Update<I, F> where F: FnMut(&mut I::Item) + Clone + Send + 'static, { type Item = I::Item; type Task = UpdateTask<I::Task, F>; fn task(&self) -> Self::Task { let task = self.i.task(); let f = self.f.clone(); UpdateTask { task, f } } } } #[pin_project] #[derive(Serialize, Deserialize)] pub struct UpdateTask<T, F> { #[pin] task: T, f: F, } impl<C: StreamTask, F> StreamTask for UpdateTask<C, F> where F: FnMut(&mut C::Item) + Clone, { type Item = C::Item; type Async = UpdateTask<C::Async, F>; fn into_async(self) -> Self::Async { UpdateTask { task: self.task.into_async(), f: self.f, } } } impl<C: PipeTask<Source>, F, Source> PipeTask<Source> for UpdateTask<C, F> where F: FnMut(&mut <C as PipeTask<Source>>::Item) + Clone, { type Item = C::Item; type Async = UpdateTask<C::Async, F>; fn into_async(self) -> Self::Async { UpdateTask { task: self.task.into_async(), f: self.f, } } } impl<C: Stream, F> Stream for UpdateTask<C, F> where F: FnMut(&mut C::Item) + Clone, { type Item = C::Item; fn poll_next(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> { let mut self_ = self.project(); let (task, f) = (self_.task, &mut self_.f); task.poll_next(cx).map(|item| { item.map(|mut item| { f(&mut item); item }) }) } } impl<C: Pipe<Source>, F, Source> Pipe<Source> for UpdateTask<C, F> where F: FnMut(&mut C::Item) + Clone, { type Item = C::Item; fn poll_next( self: Pin<&mut Self>, cx: &mut Context, stream: Pin<&mut impl Stream<Item = Source>>, ) -> Poll<Option<Self::Item>> { let mut self_ = self.project(); let (task, f) = (self_.task, &mut self_.f); task.poll_next(cx, stream).map(|item| { item.map(|mut item| { f(&mut item); item }) }) } }