Switch to async implementation

This commit is contained in:
Lucas Schumacher 2023-12-28 16:25:52 -05:00
parent 13610f3470
commit aeb14be0b6
3 changed files with 380 additions and 125 deletions

351
Cargo.lock generated
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@ -2,6 +2,357 @@
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@ -6,3 +6,4 @@ edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies] [dependencies]
tokio = { version = "1.35.1", features = ["full"] }

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@ -1,134 +1,37 @@
use std::io::Read; use tokio::io::{AsyncReadExt, AsyncWriteExt};
use std::io::Write; use tokio::net::TcpListener;
use std::net::TcpListener; use tokio::sync::broadcast;
use std::net::TcpStream;
mod message_bus { #[tokio::main]
use std::sync::mpsc::{channel, Receiver, SendError, Sender}; async fn main() -> std::io::Result<()> {
let (tx, _rx) = broadcast::channel(128);
pub struct MsgSender(Sender<Msg>); let listener = TcpListener::bind("127.0.0.1:8001").await?;
impl MsgSender {
pub fn send(&self, data: Vec<u8>) -> Result<(), SendError<Msg>> {
self.0.send(Msg::Data(data))
}
}
//pub struct MsgReceiver(Receiver<Vec<u8>>);
pub type MsgReceiver = Receiver<Vec<u8>>;
pub enum Msg {
Data(Vec<u8>),
Subscribe(Sender<Vec<u8>>),
}
pub struct MessageBus {
input: Sender<Msg>,
//outputs: Vec<Sender<Msg>>,
}
fn output_loop(main_rx: Receiver<Msg>) {
let mut outputs: Vec<Sender<Vec<u8>>> = vec![];
loop { loop {
match main_rx.recv() { let (stream, addr) = listener.accept().await?;
Ok(Msg::Data(data)) => { println!("{addr} Connected");
let mut i = 0; let (mut rx_tcp, mut tx_tcp) = stream.into_split();
while i < outputs.len() { let tx_bus = tx.clone();
if outputs[i].send(data.clone()).is_err() { let mut rx_bus = tx_bus.subscribe();
outputs.swap_remove(i);
} else {
i += 1;
}
}
}
Ok(Msg::Subscribe(sender)) => {
outputs.push(sender);
}
Err(_e) => {
println!("Error bus died")
}
}
}
}
impl MessageBus {
pub fn new() -> Self {
let (input, input_rx) = channel();
std::thread::spawn(move || output_loop(input_rx)); tokio::task::spawn(async move {
Self { input, /*outputs*/ }
}
pub fn subscribe(&self) -> (MsgSender, Receiver<Vec<u8>>) {
let (tx, rx) = channel();
let input = self.input.clone();
input.send(Msg::Subscribe(tx)).unwrap();
(MsgSender(input), rx)
}
}
}
fn main() -> std::io::Result<()> {
let bus = message_bus::MessageBus::new();
/*
let (tx1, rx1) = bus.subscribe();
let (tx2, rx2) = bus.subscribe();
let payload = "Hello world!".to_string().as_bytes().to_vec();
tx1.send(payload.clone()).unwrap();
assert_eq!(rx2.recv().unwrap(), rx1.recv().unwrap());
println!("sleeping 5");
std::thread::sleep(std::time::Duration::from_secs(5));
println!("dropping rx2 and sleeping 5");
drop(rx2);
drop(tx2);
std::thread::sleep(std::time::Duration::from_secs(5));
println!("sending payload and sleeping 5");
tx1.send(payload.clone()).unwrap();
std::thread::sleep(std::time::Duration::from_secs(5));
println!("creating new rx2 and sleeping 5");
let (tx2, rx2) = bus.subscribe();
std::thread::sleep(std::time::Duration::from_secs(5));
println!("sending payload and sleeping 5");
tx2.send(payload.clone()).unwrap();
std::thread::sleep(std::time::Duration::from_secs(5));
*/
let listener = TcpListener::bind("127.0.0.1:8001")?;
for stream in listener.incoming() {
match stream {
Ok(tx_tcp) => {
let (tx_bus, rx_bus) = bus.subscribe();
let rx_tcp = tx_tcp.try_clone().unwrap();
std::thread::spawn(move || publish_thread(rx_tcp, tx_bus));
std::thread::spawn(move || consume_thread(tx_tcp, rx_bus));
}
Err(e) => {
println!("Error accepting connection: {}", e);
}
}
}
Ok(())
}
fn publish_thread(mut rx_tcp: TcpStream, tx_bus: message_bus::MsgSender) {
let mut buffer = vec![0_u8; 2048]; let mut buffer = vec![0_u8; 2048];
while let Ok(len) = rx_tcp.read(&mut buffer) { while let Ok(len) = rx_tcp.read(&mut buffer).await {
let data = buffer[..len].to_vec(); let data = buffer[..len].to_vec();
if tx_bus.send(data).is_err() { if tx_bus.send(data).is_err() {
break; break;
} }
} }
} });
fn consume_thread(mut tx_tcp: TcpStream, rx_bus: message_bus::MsgReceiver) { tokio::task::spawn(async move {
while let Ok(data) = rx_bus.recv() { while let Ok(data) = rx_bus.recv().await {
if tx_tcp.write_all(&data).is_err() { let owned_data = data.to_vec();
if tx_tcp.write_all(&owned_data).await.is_err() {
break; break;
} }
} }
});
}
//Ok(())
} }