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tools/wrapped_reader_stream.rs: allocate Vec<u8> for buffer

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This commit is contained in:
Dietmar Maurer 2019-01-20 11:01:18 +01:00
parent ff8bdf3b64
commit 8eeef8492a
1 changed files with 6 additions and 4 deletions
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10
src/tools/wrapped_reader_stream.rs
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@ -6,12 +6,15 @@ use futures::stream::Stream;
pub struct WrappedReaderStream<R: Read> {
reader: R,
buffer: Vec<u8>,
}
impl <R: Read> WrappedReaderStream<R> {
pub fn new(reader: R) -> Self {
Self { reader }
let mut buffer = Vec::with_capacity(64*1024);
unsafe { buffer.set_len(buffer.capacity()); }
Self { reader, buffer }
}
}
@ -27,13 +30,12 @@ impl <R: Read> Stream for WrappedReaderStream<R> {
type Error = std::io::Error;
fn poll(&mut self) -> Result<Async<Option<Vec<u8>>>, std::io::Error> {
let mut buf = [0u8;64*1024];
match tokio_threadpool::blocking(|| self.reader.read(&mut buf)) {
match tokio_threadpool::blocking(|| self.reader.read(&mut self.buffer)) {
Ok(Async::Ready(Ok(n))) => {
if n == 0 { // EOF
Ok(Async::Ready(None))
} else {
Ok(Async::Ready(Some(buf[..n].to_vec())))
Ok(Async::Ready(Some(self.buffer[..n].to_vec())))
}
},
Ok(Async::Ready(Err(err))) => Err(err),