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
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122

use std::marker::PhantomData;
use std::pin::Pin;
use std::task::{Context, Poll};

use requiem_codec::{AsyncRead, AsyncWrite, Decoder, Encoder, Framed};
use requiem_utils::mpsc::Receiver;
use futures::Stream;

pub struct Connect<Io, Codec>
where
    Codec: Encoder + Decoder,
{
    io: Io,
    _t: PhantomData<Codec>,
}

impl<Io, Codec> Connect<Io, Codec>
where
    Io: AsyncRead + AsyncWrite,
    Codec: Encoder + Decoder,
{
    pub(crate) fn new(io: Io) -> Self {
        Self {
            io,
            _t: PhantomData,
        }
    }

    pub fn codec(
        self,
        codec: Codec,
    ) -> ConnectResult<Io, (), Codec, Receiver<<Codec as Encoder>::Item>> {
        ConnectResult {
            state: (),
            out: None,
            framed: Framed::new(self.io, codec),
        }
    }
}

#[pin_project::pin_project]
pub struct ConnectResult<Io, St, Codec: Encoder + Decoder, Out> {
    pub(crate) state: St,
    pub(crate) out: Option<Out>,
    pub(crate) framed: Framed<Io, Codec>,
}

impl<Io, St, Codec: Encoder + Decoder, Out: Unpin> ConnectResult<Io, St, Codec, Out> {
    #[inline]
    pub fn get_ref(&self) -> &Io {
        self.framed.get_ref()
    }

    #[inline]
    pub fn get_mut(&mut self) -> &mut Io {
        self.framed.get_mut()
    }

    pub fn out<U>(self, out: U) -> ConnectResult<Io, St, Codec, U>
    where
        U: Stream<Item = <Codec as Encoder>::Item> + Unpin,
    {
        ConnectResult {
            state: self.state,
            framed: self.framed,
            out: Some(out),
        }
    }

    #[inline]
    pub fn state<S>(self, state: S) -> ConnectResult<Io, S, Codec, Out> {
        ConnectResult {
            state,
            framed: self.framed,
            out: self.out,
        }
    }
}

impl<Io, St, Codec, Out> Stream for ConnectResult<Io, St, Codec, Out>
where
    Io: AsyncRead + AsyncWrite,
    Codec: Encoder + Decoder,
{
    type Item = Result<<Codec as Decoder>::Item, <Codec as Decoder>::Error>;

    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        self.project().framed.next_item(cx)
    }
}

impl<Io, St, Codec, Out> futures::Sink<<Codec as Encoder>::Item>
    for ConnectResult<Io, St, Codec, Out>
where
    Io: AsyncRead + AsyncWrite,
    Codec: Encoder + Decoder,
{
    type Error = <Codec as Encoder>::Error;

    fn poll_ready(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        if self.framed.is_write_ready() {
            Poll::Ready(Ok(()))
        } else {
            Poll::Pending
        }
    }

    fn start_send(
        self: Pin<&mut Self>,
        item: <Codec as Encoder>::Item,
    ) -> Result<(), Self::Error> {
        self.project().framed.write(item)
    }

    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        self.get_mut().framed.flush(cx)
    }

    fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        self.get_mut().framed.close(cx)
    }
}