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use anyhow::{bail, Context, Result};
use async_net::{TcpListener, TcpStream};
use futures::AsyncWriteExt;
use crate::runtime::AsyncKernel;
use crate::runtime::Block;
use crate::runtime::BlockMeta;
use crate::runtime::BlockMetaBuilder;
use crate::runtime::MessageIo;
use crate::runtime::MessageIoBuilder;
use crate::runtime::StreamIo;
use crate::runtime::StreamIoBuilder;
use crate::runtime::WorkIo;
pub struct TcpSink {
port: u32,
listener: Option<TcpListener>,
socket: Option<TcpStream>,
}
impl TcpSink {
pub fn new(port: u32) -> Block {
Block::new_async(
BlockMetaBuilder::new("TcpSink").build(),
StreamIoBuilder::new().add_input("in", 1).build(),
MessageIoBuilder::new().build(),
TcpSink {
port,
listener: None,
socket: None,
},
)
}
}
#[async_trait]
impl AsyncKernel for TcpSink {
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 sink accepted connection");
}
let i = sio.input(0).slice::<u8>();
match self
.socket
.as_mut()
.context("no socket")?
.write_all(i)
.await
{
Ok(()) => {}
Err(_) => bail!("tcp sink socket error"),
}
if sio.input(0).finished() {
io.finished = true;
}
debug!("tcp sink wrote bytes {}", i.len());
sio.input(0).consume(i.len());
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(())
}
}
pub struct TcpSinkBuilder {
port: u32,
}
impl TcpSinkBuilder {
pub fn new(port: u32) -> TcpSinkBuilder {
TcpSinkBuilder { port }
}
pub fn build(self) -> Block {
TcpSink::new(self.port)
}
}