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use async_net::{TcpListener, TcpStream};
use futures::AsyncReadExt;
use crate::anyhow::{Context, Result};
use crate::runtime::Block;
use crate::runtime::BlockMeta;
use crate::runtime::BlockMetaBuilder;
use crate::runtime::Kernel;
use crate::runtime::MessageIo;
use crate::runtime::MessageIoBuilder;
use crate::runtime::StreamIo;
use crate::runtime::StreamIoBuilder;
use crate::runtime::WorkIo;
pub struct TcpSource {
port: u32,
listener: Option<TcpListener>,
socket: Option<TcpStream>,
}
impl TcpSource {
pub fn new(port: u32) -> Block {
Block::new(
BlockMetaBuilder::new("TcpSource").build(),
StreamIoBuilder::new().add_output("out", 1).build(),
MessageIoBuilder::new().build(),
TcpSource {
port,
listener: None,
socket: None,
},
)
}
}
#[doc(hidden)]
#[async_trait]
impl Kernel for TcpSource {
async fn work(
&mut self,
io: &mut WorkIo,
sio: &mut StreamIo,
_mio: &mut MessageIo<Self>,
_meta: &mut BlockMeta,
) -> Result<()> {
if self.socket.is_none() {
let (socket, _) = self
.listener
.as_mut()
.context("no listener")?
.accept()
.await?;
self.socket = Some(socket);
debug!("tcp source accepted connection");
}
let out = sio.output(0).slice::<u8>();
if out.is_empty() {
return Ok(());
}
match self
.socket
.as_mut()
.context("no socket")?
.read_exact(out)
.await
{
Ok(_) => {
debug!("tcp source read bytes {}", out.len());
sio.output(0).produce(out.len());
}
Err(_) => {
debug!("tcp source socket closed");
io.finished = true;
}
}
Ok(())
}
async fn init(
&mut self,
_sio: &mut StreamIo,
_mio: &mut MessageIo<Self>,
_meta: &mut BlockMeta,
) -> Result<()> {
self.listener = Some(TcpListener::bind(format!("127.0.0.1:{}", self.port)).await?);
Ok(())
}
}