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write_counter.rs
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write_counter.rs
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// Copyright 2022 The Native Link Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::pin::Pin;
use std::task::{Context, Poll};
use pin_project_lite::pin_project;
use tokio::io::AsyncWrite;
pin_project! {
/// Utility struct that counts the number of bytes sent and passes everything else through to
/// the underlying writer.
pub struct WriteCounter<T: AsyncWrite> {
#[pin]
inner: T,
bytes_written: u64,
failed: bool,
}
}
impl<T: AsyncWrite> WriteCounter<T> {
pub fn new(inner: T) -> Self {
WriteCounter {
inner,
bytes_written: 0,
failed: false,
}
}
pub fn inner_ref(&self) -> &T {
&self.inner
}
pub fn inner_mut(&mut self) -> &mut T {
&mut self.inner
}
/// Returns the number of bytes written.
pub fn get_bytes_written(&self) -> u64 {
self.bytes_written
}
pub fn did_fail(&self) -> bool {
self.failed
}
}
impl<T: AsyncWrite> AsyncWrite for WriteCounter<T> {
fn poll_write(self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &[u8]) -> Poll<Result<usize, std::io::Error>> {
let me = self.project();
let result = me.inner.poll_write(cx, buf);
match &result {
Poll::Ready(Result::Ok(sz)) => *me.bytes_written += *sz as u64,
Poll::Ready(Result::Err(_)) => *me.failed = true,
_ => {}
}
result
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), std::io::Error>> {
let me = self.project();
me.inner.poll_flush(cx)
}
fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), std::io::Error>> {
let me = self.project();
me.inner.poll_shutdown(cx)
}
}