tyler/proxmox-backup
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src/backup/chunk_stream.rs: use BytesMut in ChunkStream

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This commit is contained in:
Dietmar Maurer 2019-05-22 09:39:02 +02:00
parent c052be5c86
commit 0cc0fffd1e
1 changed files with 21 additions and 27 deletions
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48
src/backup/chunk_stream.rs
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@ -4,17 +4,19 @@ use proxmox_protocol::Chunker;
use futures::{Async, Poll};
use futures::stream::Stream;
use bytes::BytesMut;
/// Split input stream into dynamic sized chunks
pub struct ChunkStream<S> {
input: S,
chunker: Chunker,
buffer: Option<Vec<u8>>,
scan: Option<Vec<u8>>,
buffer: BytesMut,
scan_pos: usize,
}
impl <S> ChunkStream<S> {
pub fn new(input: S) -> Self {
Self { input, chunker: Chunker::new(4 * 1024 * 1024), buffer: None, scan: None}
Self { input, chunker: Chunker::new(4 * 1024 * 1024), buffer: BytesMut::new(), scan_pos: 0}
}
}
@ -24,27 +26,24 @@ impl <S> Stream for ChunkStream<S>
S::Error: Into<Error>,
{
type Item = Vec<u8>;
type Item = BytesMut;
type Error = Error;
fn poll(&mut self) -> Poll<Option<Vec<u8>>, Error> {
fn poll(&mut self) -> Poll<Option<BytesMut>, Error> {
loop {
if let Some(data) = self.scan.take() {
let buffer = self.buffer.get_or_insert_with(|| Vec::with_capacity(1024*1024));
let boundary = self.chunker.scan(&data);
if self.scan_pos < self.buffer.len() {
let boundary = self.chunker.scan(&self.buffer[self.scan_pos..]);
let chunk_size = self.scan_pos + boundary;
if boundary == 0 {
buffer.extend(data);
self.scan_pos = self.buffer.len();
// continue poll
} else if boundary == data.len() {
buffer.extend(data);
return Ok(Async::Ready(self.buffer.take()));
} else if boundary < data.len() {
let (left, right) = data.split_at(boundary);
buffer.extend(left);
self.scan = Some(right.to_vec());
return Ok(Async::Ready(self.buffer.take()));
} else if chunk_size <= self.buffer.len() {
let result = self.buffer.split_to(chunk_size);
self.scan_pos = 0;
return Ok(Async::Ready(Some(result)));
} else {
panic!("got unexpected chunk boundary from chunker");
}
@ -58,26 +57,21 @@ impl <S> Stream for ChunkStream<S>
return Ok(Async::NotReady);
}
Ok(Async::Ready(None)) => {
let mut data = self.buffer.take().or_else(|| Some(vec![])).unwrap();
if let Some(rest) = self.scan.take() { data.extend(rest); }
if data.len() > 0 {
return Ok(Async::Ready(Some(data)));
self.scan_pos = 0;
if self.buffer.len() > 0 {
return Ok(Async::Ready(Some(self.buffer.take())));
} else {
return Ok(Async::Ready(None));
}
}
Ok(Async::Ready(Some(data))) => {
let scan = self.scan.get_or_insert_with(|| Vec::with_capacity(1024*1024));
scan.extend(data.as_ref());
}
self.buffer.extend_from_slice(data.as_ref());
}
}
}
}
}
use bytes::BytesMut;
/// Split input stream into fixed sized chunks
pub struct FixedChunkStream<S> {
input: S,