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use std::hash::Hash;
use std::io::{Read, Write};
use std::marker::PhantomData;
use std::net::{SocketAddr, TcpListener as StdTcpListener, TcpStream};
use std::sync::atomic::{AtomicU64, Ordering};
use std::sync::{Arc, Mutex};
use crate::context::Context;
use crate::transport::connection::Connection;
use crate::transport::error::TransportError;
use crate::transport::listener::Listener;
use crate::transport::receiver::PacketReceiverBuf;
use crate::transport::sender::PacketSenderBuf;
use crate::transport::{Result, Transport};
#[derive(Clone)]
pub struct TcpSender {
stream: Arc<Mutex<TcpStream>>,
}
impl<Data> PacketSenderBuf<Data> for TcpSender {
fn send_buf(&self, buf: &[u8]) -> Result<()> {
let mut guard = self
.stream
.lock()
.map_err(|_| TransportError::LockPoisoned)?;
guard.write_all(buf)?;
guard.flush()?;
Ok(())
}
}
pub struct TcpReceiver<Uid> {
stream: Arc<Mutex<TcpStream>>,
uid: Uid,
}
impl<Data, Uid> PacketReceiverBuf<Data, Uid> for TcpReceiver<Uid>
where
Uid: PartialEq + Clone + Send + Sync,
{
fn recv_buf(&self, _ctx: &Context<Data>) -> Result<(Uid, Vec<u8>)> {
let mut guard = self
.stream
.lock()
.map_err(|_| TransportError::LockPoisoned)?;
// Read 4-byte big-endian length prefix
let mut len_buf = [0u8; 4];
guard.read_exact(&mut len_buf)?;
let len = u32::from_be_bytes(len_buf) as usize;
let mut buf = vec![0u8; len];
guard.read_exact(&mut buf)?;
Ok((self.uid.clone(), buf))
}
}
pub struct TcpListener<Uid, Data> {
listener: Arc<StdTcpListener>,
factory: Arc<dyn Fn() -> Uid + Send + Sync>,
_p: PhantomData<Data>,
}
impl<Uid, Data> Listener<Uid> for TcpListener<Uid, Data>
where
Uid: PartialEq + Eq + Hash + Clone + Send + Sync,
Data: Send + Sync,
{
type Data = Data;
type Sender = TcpSender;
type Receiver = TcpReceiver<Uid>;
fn accept(&mut self) -> Result<Connection<Uid, Data, TcpSender, TcpReceiver<Uid>>> {
let (stream, _peer) = self.listener.accept()?;
let stream = Arc::new(Mutex::new(stream));
let uid = (self.factory)();
let sender = TcpSender {
stream: stream.clone(),
};
let receiver = TcpReceiver { stream, uid };
Ok(Connection::new(sender, receiver))
}
}
pub struct TcpTransport<Uid, Data> {
factory: Arc<dyn Fn() -> Uid + Send + Sync>,
_p: PhantomData<(Uid, Data)>,
}
impl<Uid, Data> TcpTransport<Uid, Data>
where
Uid: PartialEq + Eq + Hash + Clone + Send + Sync,
{
pub fn new<F: Fn() -> Uid + Send + Sync + 'static>(factory: F) -> Self {
Self {
factory: Arc::new(factory),
_p: PhantomData,
}
}
}
impl Default for TcpTransport<u64, ()> {
fn default() -> Self {
let counter = Arc::new(AtomicU64::new(0));
TcpTransport::new(move || counter.fetch_add(1, Ordering::Relaxed))
}
}
impl<Uid, Data> Transport<Uid> for TcpTransport<Uid, Data>
where
Uid: PartialEq + Eq + Hash + Clone + Send + Sync,
Data: Send + Sync,
{
type Data = Data;
type Addr = SocketAddr;
type Sender = TcpSender;
type Receiver = TcpReceiver<Uid>;
type Listener = TcpListener<Uid, Data>;
fn connect(
&self,
addr: SocketAddr,
) -> Result<Connection<Uid, Data, TcpSender, TcpReceiver<Uid>>> {
let stream = TcpStream::connect(addr)?;
let stream = Arc::new(Mutex::new(stream));
let uid = (self.factory)();
let sender = TcpSender {
stream: stream.clone(),
};
let receiver = TcpReceiver { stream, uid };
Ok(Connection::new(sender, receiver))
}
fn listen(&self, addr: SocketAddr) -> Result<TcpListener<Uid, Data>> {
let listener = StdTcpListener::bind(addr)?;
Ok(TcpListener {
listener: Arc::new(listener),
factory: self.factory.clone(),
_p: PhantomData,
})
}
}
|
