44 lines
1.2 KiB
Rust
44 lines
1.2 KiB
Rust
use futures_core::future::Future;
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use futures_core::ready;
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use futures_core::task::{Context, Poll};
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use futures_io::AsyncWrite;
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use std::io;
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use std::mem;
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use std::pin::Pin;
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/// Future for the [`write_all`](super::AsyncWriteExt::write_all) method.
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#[derive(Debug)]
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#[must_use = "futures do nothing unless you `.await` or poll them"]
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pub struct WriteAll<'a, W: ?Sized> {
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writer: &'a mut W,
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buf: &'a [u8],
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}
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impl<W: ?Sized + Unpin> Unpin for WriteAll<'_, W> {}
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impl<'a, W: AsyncWrite + ?Sized + Unpin> WriteAll<'a, W> {
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pub(super) fn new(writer: &'a mut W, buf: &'a [u8]) -> Self {
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Self { writer, buf }
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}
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}
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impl<W: AsyncWrite + ?Sized + Unpin> Future for WriteAll<'_, W> {
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type Output = io::Result<()>;
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fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
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let this = &mut *self;
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while !this.buf.is_empty() {
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let n = ready!(Pin::new(&mut this.writer).poll_write(cx, this.buf))?;
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{
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let (_, rest) = mem::take(&mut this.buf).split_at(n);
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this.buf = rest;
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}
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if n == 0 {
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return Poll::Ready(Err(io::ErrorKind::WriteZero.into()));
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}
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}
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Poll::Ready(Ok(()))
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}
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}
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