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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, data: &[u8]) -> crate::error::Result<()> {
self.frame_at(std::time::Instant::now(), data)
}
pub fn frame_at(
&mut self,
time: std::time::Instant,
data: &[u8],
) -> crate::error::Result<()> {
let frame = self.creator.frame_at(time, data);
let bytes: Vec<u8> = std::convert::TryFrom::try_from(frame)?;
self.to_write.extend(bytes.iter());
Ok(())
}
pub fn poll_write(&mut self) -> futures::Poll<(), crate::error::Error> {
loop {
if self.to_write.is_empty() {
return Ok(futures::Async::Ready(()));
}
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));
if n > 0 {
for _ in 0..n {
self.to_write.pop_front();
}
} else {
return Err(crate::error::Error::EOF);
}
}
}
pub fn needs_write(&self) -> bool {
!self.to_write.is_empty()
}
}
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