exocore-transport 0.1.26

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

use futures::{
    channel::{mpsc, mpsc::SendError},
    prelude::*,
    sink::{Sink, SinkErrInto},
    StreamExt,
};
use pin_project::pin_project;

use crate::{Error, InEvent, OutEvent};

/// Wraps mpsc Stream channel to map Transport's error without having a
/// convoluted type
pub struct MpscHandleStream {
    receiver: mpsc::Receiver<InEvent>,
}

impl MpscHandleStream {
    pub fn new(receiver: mpsc::Receiver<InEvent>) -> MpscHandleStream {
        MpscHandleStream { receiver }
    }
}

impl Stream for MpscHandleStream {
    type Item = InEvent;

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

/// Wraps mpsc Sink channel to map Transport's error without having a convoluted
/// type
#[pin_project]
pub struct MpscHandleSink {
    #[pin]
    sender: SinkErrInto<mpsc::Sender<OutEvent>, OutEvent, Error>,
}

impl MpscHandleSink {
    pub fn new(sender: mpsc::Sender<OutEvent>) -> MpscHandleSink {
        MpscHandleSink {
            sender: sender.sink_err_into(),
        }
    }
}

impl Sink<OutEvent> for MpscHandleSink {
    type Error = Error;

    fn poll_ready(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        self.project().sender.poll_ready(cx)
    }

    fn start_send(self: Pin<&mut Self>, item: OutEvent) -> Result<(), Self::Error> {
        self.project().sender.start_send(item)
    }

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

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

impl From<SendError> for Error {
    fn from(s: SendError) -> Self {
        Error::Other(format!("Sink error: {}", s))
    }
}