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use std::{
cell::RefCell,
io::{self, Read, Write},
net::{SocketAddr, TcpListener as StdTcpListener, TcpStream as StdTcpStream, ToSocketAddrs},
os::unix::prelude::AsRawFd,
rc::{Rc, Weak},
task::Poll,
};
use futures::Stream;
use socket2::{Domain, Protocol, Socket, Type};
use crate::{reactor::get_reactor, reactor::Reactor};
#[derive(Debug)]
pub struct TcpListener {
reactor: Weak<RefCell<Reactor>>,
listener: StdTcpListener,
}
impl TcpListener {
pub fn bind<A: ToSocketAddrs>(addr: A) -> Result<Self, io::Error> {
let addr = addr
.to_socket_addrs()?
.next()
.ok_or_else(|| io::Error::new(io::ErrorKind::Other, "empty address"))?;
let domain = if addr.is_ipv6() {
Domain::IPV6
} else {
Domain::IPV4
};
let sk = Socket::new(domain, Type::STREAM, Some(Protocol::TCP))?;
let addr = socket2::SockAddr::from(addr);
sk.set_reuse_address(true)?;
sk.bind(&addr)?;
sk.listen(1024)?;
// add fd to reactor
let reactor = get_reactor();
reactor.borrow_mut().add(sk.as_raw_fd());
println!("tcp bind with fd {}", sk.as_raw_fd());
Ok(Self {
reactor: Rc::downgrade(&reactor),
listener: sk.into(),
})
}
}
impl Stream for TcpListener {
type Item = std::io::Result<(TcpStream, SocketAddr)>;
fn poll_next(
self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Option<Self::Item>> {
match self.listener.accept() {
Ok((stream, addr)) => Poll::Ready(Some(Ok((stream.into(), addr)))),
Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
// modify reactor to register interest
let reactor = self.reactor.upgrade().unwrap();
reactor
.borrow_mut()
.modify_readable(self.listener.as_raw_fd(), cx);
Poll::Pending
}
Err(e) => std::task::Poll::Ready(Some(Err(e))),
}
}
}
#[derive(Debug)]
pub struct TcpStream {
stream: StdTcpStream,
}
impl From<StdTcpStream> for TcpStream {
fn from(stream: StdTcpStream) -> Self {
let reactor = get_reactor();
reactor.borrow_mut().add(stream.as_raw_fd());
Self { stream }
}
}
impl Drop for TcpStream {
fn drop(&mut self) {
println!("drop");
let reactor = get_reactor();
reactor.borrow_mut().delete(self.stream.as_raw_fd());
}
}
impl tokio::io::AsyncRead for TcpStream {
fn poll_read(
mut self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
buf: &mut tokio::io::ReadBuf<'_>,
) -> Poll<io::Result<()>> {
let fd = self.stream.as_raw_fd();
unsafe {
let b = &mut *(buf.unfilled_mut() as *mut [std::mem::MaybeUninit<u8>] as *mut [u8]);
println!("read for fd {}", fd);
match self.stream.read(b) {
Ok(n) => {
println!("read for fd {} done, {}", fd, n);
buf.assume_init(n);
buf.advance(n);
Poll::Ready(Ok(()))
}
Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => {
println!("read for fd {} done WouldBlock", fd);
// modify reactor to register interest
let reactor = get_reactor();
reactor
.borrow_mut()
.modify_readable(self.stream.as_raw_fd(), cx);
Poll::Pending
}
Err(e) => {
println!("read for fd {} done err", fd);
Poll::Ready(Err(e))
}
}
}
}
}
impl tokio::io::AsyncWrite for TcpStream {
fn poll_write(
mut self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
buf: &[u8],
) -> Poll<Result<usize, io::Error>> {
match self.stream.write(buf) {
Ok(n) => Poll::Ready(Ok(n)),
Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => {
let reactor = get_reactor();
reactor
.borrow_mut()
.modify_writable(self.stream.as_raw_fd(), cx);
Poll::Pending
}
Err(e) => Poll::Ready(Err(e)),
}
}
fn poll_flush(
self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> Poll<Result<(), io::Error>> {
Poll::Ready(Ok(()))
}
fn poll_shutdown(
self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> Poll<Result<(), io::Error>> {
self.stream.shutdown(std::net::Shutdown::Write)?;
Poll::Ready(Ok(()))
}
}
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