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use snafu::ResultExt as _;
pub struct Writer<W> {
writer: W,
creator: crate::creator::Creator,
to_write: std::collections::VecDeque<u8>,
}
impl<W: tokio::io::AsyncWrite> Writer<W> {
pub fn new(writer: W) -> Self {
Self {
writer,
creator: crate::creator::Creator::new(),
to_write: std::collections::VecDeque::new(),
}
}
pub fn frame(
&mut self,
time: std::time::Instant,
data: &[u8],
) -> crate::error::Result<()> {
let bytes = self.creator.frame(time, data)?;
self.to_write.extend(bytes.iter());
Ok(())
}
pub fn poll_write(&mut self) -> futures::Poll<(), crate::error::Error> {
let (a, b) = self.to_write.as_slices();
let buf = if a.is_empty() { b } else { a };
let n = futures::try_ready!(self
.writer
.poll_write(buf)
.context(crate::error::WriteFile));
for _ in 0..n {
self.to_write.pop_front();
}
Ok(futures::Async::Ready(()))
}
pub fn is_empty(&self) -> bool {
self.to_write.is_empty()
}
}
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