1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
use snafu::ResultExt as _;
/// Writes ttyrec frames to a `tokio::io::AsyncWrite` instance.
pub struct Writer<W> {
writer: W,
creator: crate::creator::Creator,
to_write: std::collections::VecDeque<u8>,
}
impl<W: tokio::io::AsyncWrite> Writer<W> {
/// Creates a new `Writer` from a `tokio::io::AsyncWrite` instance.
pub fn new(writer: W) -> Self {
Self {
writer,
creator: crate::creator::Creator::new(),
to_write: std::collections::VecDeque::new(),
}
}
/// Generates a new ttyrec frame with the given data.
///
/// Equivalent to calling `frame_at` and passing
/// `std::time::Instant::now()` as the `time` parameter.
pub fn frame(&mut self, data: &[u8]) -> crate::error::Result<()> {
self.frame_at(std::time::Instant::now(), data)
}
/// Generates a new ttyrec frame with the given data at the given time.
///
/// The frame data will be stored on this object until written out by
/// calls to `poll_write`.
///
/// Note that this is not guaranteed to do the correct thing unless the
/// `cur_time` parameters given in each `frame_at` call are
/// non-decreasing.
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(())
}
/// Attempt to write serialized ttyrec frames to the underlying writer.
///
/// Writes data from the previous calls to `frame` and `frame_at`. Returns
/// `Ok(Async::Ready(()))` if all bytes were written, and
/// `Ok(Async::NotReady)` otherwise.
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);
}
}
}
/// Returns `true` if there are still bytes that need to be written.
///
/// It is only necessary to call `poll_write` if this method returns
/// `true`.
pub fn needs_write(&self) -> bool {
!self.to_write.is_empty()
}
}
|
