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use std::{fmt::Display, mem, pin::pin, task::Poll};
use futures::ready;
use pin_project::pin_project;
pub use tokio::io::AsyncWrite;
#[pin_project]
#[derive(Debug)]
pub struct Loggable<W> {
log_buffer: Vec<u8>,
#[pin]
writer: W,
}
impl<W> Loggable<W> {
pub fn new(writer: W) -> Self {
Self {
log_buffer: Vec::new(),
writer,
}
}
pub fn into_inner(self) -> W {
self.writer
}
pub fn take_log(&mut self) -> Vec<u8> {
let log: Vec<u8> = mem::replace(&mut self.log_buffer, Vec::new());
log
}
}
impl<W: AsyncWrite + Unpin + Send> Display for Loggable<W> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let str = str::from_utf8(&self.log_buffer).unwrap_or("buffer to string conversion failed");
f.write_str(str)
}
}
impl<W: AsyncWrite + Unpin + Send> AsyncWrite for Loggable<W> {
fn poll_write(
mut self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
buf: &[u8],
) -> std::task::Poll<Result<usize, std::io::Error>> {
let this = self.as_mut().project();
let ready = ready!(this.writer.poll_write(cx, buf));
self.log_buffer.extend_from_slice(buf);
Poll::Ready(ready)
}
fn poll_flush(
self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), std::io::Error>> {
let this = self.project();
Poll::Ready(ready!(this.writer.poll_flush(cx)))
}
fn poll_shutdown(
self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Result<(), std::io::Error>> {
let this = self.project();
Poll::Ready(ready!(this.writer.poll_shutdown(cx)))
}
}
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