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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -10,6 +10,7 @@ pub struct Error { | |
| #[derive(Debug)] | ||
| pub enum ErrorKind { | ||
| BadPacket, | ||
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| } | ||
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| #[derive(Debug)] | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,153 @@ | ||
| use std::{ | ||
| collections::VecDeque, | ||
| io::{Cursor, Write}, | ||
| sync::{Arc, Mutex}, | ||
| task::Poll, | ||
| }; | ||
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| use futures::{AsyncRead, AsyncWrite}; | ||
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| use async_trait::async_trait; | ||
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| #[derive(Debug, Clone)] | ||
| pub struct Buffer<T> { | ||
| len: usize, | ||
| buf: Arc<Mutex<VecDeque<Vec<T>>>>, | ||
| } | ||
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| impl<T> Buffer<T> | ||
| where | ||
| T: Clone, | ||
| { | ||
| #[inline] | ||
| pub fn new() -> Self { | ||
| Self { | ||
| len: 0, | ||
| buf: Arc::new(Mutex::new(VecDeque::new())), | ||
| } | ||
| } | ||
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| pub fn is_empty(&self) -> bool { | ||
| self.buf.lock().unwrap().is_empty() | ||
| } | ||
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| pub fn len(&self) -> usize { | ||
| self.len | ||
| } | ||
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| pub fn clear(&mut self) { | ||
| self.buf.lock().unwrap().clear(); | ||
| self.len = 0; | ||
| } | ||
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| pub fn push_back(&mut self, data: &[T]) { | ||
| self.buf.lock().unwrap().push_back(data.to_vec()); | ||
| self.len += data.len(); | ||
| } | ||
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| pub fn push_front(&mut self, data: &[T]) { | ||
| self.buf.lock().unwrap().push_front(data.to_vec()); | ||
| self.len += data.len(); | ||
| } | ||
| } | ||
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| impl Buffer<u8> { | ||
| pub fn read_to_buffer(&mut self, buf: &mut [u8]) -> std::io::Result<usize> { | ||
| let mut remaining = buf.len(); | ||
| let mut read_len = 0; | ||
| let mut io = Cursor::new(buf); | ||
| let mut buf = self.buf.lock().unwrap(); | ||
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| loop { | ||
| if remaining == 0 { | ||
| self.len -= read_len; | ||
| break Ok(read_len); | ||
| } | ||
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| let data = buf.pop_front(); | ||
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| if data.is_none() { | ||
| self.len -= read_len; | ||
| break Ok(read_len); | ||
| } | ||
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| let data = data.unwrap(); | ||
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| if data.len() >= remaining { | ||
| let n = io.write(&data[..remaining])?; | ||
| remaining -= n; | ||
| read_len += n; | ||
|
|
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| if data.len() != n { | ||
| buf.push_front(data[n..].to_vec()) | ||
| } | ||
| } else { | ||
| let n = io.write(&data)?; | ||
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| read_len += n; | ||
| remaining -= n; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| #[async_trait] | ||
| impl AsyncRead for Buffer<u8> { | ||
| fn poll_read( | ||
| mut self: std::pin::Pin<&mut Self>, | ||
| _: &mut std::task::Context<'_>, | ||
| buf: &mut [u8], | ||
| ) -> std::task::Poll<std::io::Result<usize>> { | ||
| Poll::Ready(self.read_to_buffer(buf)) | ||
| } | ||
| } | ||
|
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| #[async_trait] | ||
| impl AsyncWrite for Buffer<u8> { | ||
| fn poll_write( | ||
| mut self: std::pin::Pin<&mut Self>, | ||
| _: &mut std::task::Context<'_>, | ||
| buf: &[u8], | ||
| ) -> std::task::Poll<std::io::Result<usize>> { | ||
| self.push_back(buf); | ||
| Poll::Ready(Ok(buf.len())) | ||
| } | ||
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| fn poll_flush( | ||
| self: std::pin::Pin<&mut Self>, | ||
| _: &mut std::task::Context<'_>, | ||
| ) -> std::task::Poll<std::io::Result<()>> { | ||
| Poll::Ready(Ok(())) | ||
| } | ||
|
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| fn poll_close( | ||
| mut self: std::pin::Pin<&mut Self>, | ||
| _: &mut std::task::Context<'_>, | ||
| ) -> std::task::Poll<std::io::Result<()>> { | ||
| self.clear(); | ||
| Poll::Ready(Ok(())) | ||
| } | ||
| } | ||
|
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| #[test] | ||
| fn test_buffer() { | ||
| use smol::io::{AsyncReadExt, AsyncWriteExt}; | ||
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| smol::block_on(async move { | ||
| let mut buf: Buffer<u8> = Buffer::new(); | ||
|
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| buf.write(b"hello world").await.unwrap(); | ||
| buf.write(b"123456").await.unwrap(); | ||
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| let mut buffer = Vec::new(); | ||
| buffer.resize(11, 0); | ||
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| let n = buf.read(&mut buffer).await.unwrap(); | ||
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| assert_eq!(11, n); | ||
| assert_eq!(6, buf.len()); | ||
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| println!("{:?}", buffer); | ||
| println!("{:?}", buf); | ||
| }); | ||
| } |
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