performance improvements #342

Merged
lx merged 21 commits from lx-perf-improvements into main 2022-09-12 14:38:44 +00:00
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@ -387,7 +387,8 @@ struct StreamChunker<S: Stream<Item = Result<Bytes, Error>>> {
stream: S,
read_all: bool,
block_size: usize,
buf: VecDeque<u8>,
buf: VecDeque<Bytes>,
buf_len: usize,
}
impl<S: Stream<Item = Result<Bytes, Error>> + Unpin> StreamChunker<S> {
@ -396,29 +397,50 @@ impl<S: Stream<Item = Result<Bytes, Error>> + Unpin> StreamChunker<S> {
stream,
read_all: false,
block_size,
buf: VecDeque::with_capacity(2 * block_size),
buf: VecDeque::with_capacity(8),
buf_len: 0,
}
}
async fn next(&mut self) -> Result<Option<Vec<u8>>, Error> {
while !self.read_all && self.buf.len() < self.block_size {
while !self.read_all && self.buf_len < self.block_size {
if let Some(block) = self.stream.next().await {
let bytes = block?;
trace!("Body next: {} bytes", bytes.len());
self.buf.extend(bytes);
self.buf_len += bytes.len();
self.buf.push_back(bytes);
} else {
self.read_all = true;
}
}
if self.buf.is_empty() {
if self.buf_len == 0 {
Ok(None)
} else if self.buf.len() <= self.block_size {
let block = self.buf.drain(..).collect::<Vec<u8>>();
Ok(Some(block))
} else {
let block = self.buf.drain(..self.block_size).collect::<Vec<u8>>();
Ok(Some(block))
let mut slices = Vec::with_capacity(self.buf.len());
let mut taken = 0;
while self.buf_len > 0 && taken < self.block_size {
let front = self.buf.pop_front().unwrap();
if taken + front.len() <= self.block_size {
taken += front.len();
self.buf_len -= front.len();
slices.push(front);
} else {
let front_take = self.block_size - taken;
slices.push(front.slice(..front_take));
self.buf.push_front(front.slice(front_take..));
self.buf_len -= front_take;
break;
}
}
Ok(Some(
slices
.iter()
.map(|x| &x[..])
.collect::<Vec<_>>()
.concat()
.into(),
))
}
}
}