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use anyhow::Result;
use std::io::{BufRead, BufReader};
use std::net::{IpAddr, Shutdown, SocketAddr, TcpListener, TcpStream};
use std::sync::mpsc;
use std::thread;
use std::time::Duration;
pub struct ForeignSink {
my_addr: SocketAddr,
rx: mpsc::Receiver<serde_json::Value>,
}
impl ForeignSink {
pub fn start() -> Result<Self> {
let listener = TcpListener::bind("127.0.0.1:0").unwrap();
let my_addr = listener.local_addr().unwrap();
let (tx, rx) = mpsc::channel();
let _ = thread::Builder::new()
.name("ForeignSink".into())
.spawn(move || {
for stream in listener.incoming() {
let stream = stream.unwrap();
stream.shutdown(Shutdown::Write).unwrap();
Self::stream_handler(stream, tx.clone());
}
});
Ok(Self { my_addr, rx })
}
pub fn host_ip(&self) -> IpAddr {
self.my_addr.ip()
}
pub fn port(&self) -> u16 {
self.my_addr.port()
}
pub fn try_receive(&self, timeout: Duration) -> Option<serde_json::Value> {
self.rx
.try_recv()
.or_else(|_| {
thread::sleep(timeout);
self.rx.try_recv()
})
.ok()
}
pub fn receive(&self) -> serde_json::Value {
self.rx.recv().expect("failed to receive JSON text")
}
fn stream_handler(stream: TcpStream, tx: mpsc::Sender<serde_json::Value>) {
log::info!(
"[ForeignSink] Connection from {}",
stream.peer_addr().unwrap()
);
let mut tcp_reader = BufReader::new(stream);
loop {
let mut buf_read = String::new();
loop {
log::info!("[ForeignSink] waiting for next row message...");
let n = tcp_reader
.read_line(&mut buf_read)
.expect("failed to read from the socket");
if n == 0 {
log::info!("[ForeignSink] Got EOF. Stop stream_handler.");
return;
}
log::info!("[ForeignSink] read: {}", buf_read);
let received_json: serde_json::Value = buf_read.parse().unwrap();
tx.send(received_json).unwrap();
buf_read.clear();
}
}
}
}