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use std::{
io,
net::SocketAddr,
pin::Pin,
task::{Context, Poll},
time::Duration,
};
use futures::{Future, Sink, SinkExt, Stream, StreamExt};
use ib_tws_core::{
async_client::SpawnTask,
message::{MessageCodec, Request, Response},
};
use tokio::{io::AsyncWriteExt, net::TcpStream};
use tokio_util::codec::Framed;
pub type FramedStream = Framed<TcpStream, MessageCodec>;
pub struct Transport {
framed_stream: FramedStream,
}
impl Transport {
pub async fn connect(
addr: SocketAddr,
timeout_duration: Duration,
) -> Result<Transport, io::Error> {
let mut stream = tokio::time::timeout(timeout_duration, TcpStream::connect(&addr))
.await
.map_err(|_| io::Error::new(io::ErrorKind::Other, "connect request timeout"))??;
tokio::time::timeout(timeout_duration, stream.write_all(b"API\0"))
.await
.map_err(|_| io::Error::new(io::ErrorKind::Other, "write API head error"))??;
let framed_stream = Framed::new(stream, MessageCodec::new());
Ok(Transport {
framed_stream,
})
}
}
impl Stream for Transport {
type Item = Result<Response, io::Error>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
self.framed_stream.poll_next_unpin(cx)
}
}
impl Sink<Request> for Transport {
type Error = io::Error;
fn start_send(mut self: Pin<&mut Self>, item: Request) -> Result<(), Self::Error> {
self.framed_stream.start_send_unpin(item)
}
fn poll_ready(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
self.framed_stream.poll_ready_unpin(cx)
}
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
self.framed_stream.poll_flush_unpin(cx)
}
fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
self.framed_stream.poll_close_unpin(cx)
}
}
impl SpawnTask for Transport {
type JoinHandle<T> = tokio::task::JoinHandle<T>;
fn spawn_task<F, T>(name: &str, future: F) -> Self::JoinHandle<T>
where
F: Future<Output = T> + Send + 'static,
T: Send + 'static,
{
info!(%name, "spawning task");
tokio::task::spawn(future)
}
}