use std::future::Future;
use std::io;
use std::net::SocketAddr;
use std::pin::Pin;
use std::task::{Context, Poll};
use std::time::Duration;
use hyper::rt::{self, Read, Write};
use pin_project_lite::pin_project;
use super::Runtime;
pub struct SmolRuntime;
impl Runtime for SmolRuntime {
type TcpStream = SmolIo<smol::net::TcpStream>;
type Sleep = SmolSleep;
async fn connect(addr: SocketAddr) -> io::Result<Self::TcpStream> {
let stream = smol::net::TcpStream::connect(addr).await?;
stream.set_nodelay(true)?;
Ok(SmolIo::new(stream))
}
async fn resolve_all(host: &str, port: u16) -> io::Result<Vec<SocketAddr>> {
let addr = format!("{host}:{port}");
let addrs: Vec<SocketAddr> = smol::net::resolve(addr).await?;
if addrs.is_empty() {
return Err(io::Error::new(
io::ErrorKind::AddrNotAvailable,
"no addresses found",
));
}
Ok(addrs)
}
fn sleep(duration: Duration) -> Self::Sleep {
SmolSleep {
inner: async_io::Timer::after(duration),
}
}
fn spawn<F>(future: F)
where
F: Future<Output = ()> + Send + 'static,
{
smol::spawn(future).detach();
}
fn set_tcp_keepalive(
stream: &Self::TcpStream,
time: Duration,
interval: Option<Duration>,
retries: Option<u32>,
) -> io::Result<()> {
use socket2::SockRef;
let sock_ref = SockRef::from(stream.inner());
let mut keepalive = socket2::TcpKeepalive::new().with_time(time);
if let Some(interval) = interval {
keepalive = keepalive.with_interval(interval);
}
#[cfg(any(
target_os = "linux",
target_os = "macos",
target_os = "ios",
target_os = "freebsd",
target_os = "netbsd",
))]
if let Some(retries) = retries {
keepalive = keepalive.with_retries(retries);
}
#[cfg(not(any(
target_os = "linux",
target_os = "macos",
target_os = "ios",
target_os = "freebsd",
target_os = "netbsd",
)))]
let _ = retries;
sock_ref.set_tcp_keepalive(&keepalive)
}
#[cfg(target_os = "linux")]
fn set_tcp_fast_open(stream: &Self::TcpStream) -> io::Result<()> {
use socket2::SockRef;
use std::os::unix::io::AsRawFd;
unsafe extern "C" {
fn setsockopt(
sockfd: std::ffi::c_int,
level: std::ffi::c_int,
optname: std::ffi::c_int,
optval: *const std::ffi::c_void,
optlen: u32,
) -> std::ffi::c_int;
}
let sock_ref = SockRef::from(stream.inner());
let fd = sock_ref.as_raw_fd();
const IPPROTO_TCP: std::ffi::c_int = 6;
const TCP_FASTOPEN_CONNECT: std::ffi::c_int = 30;
let optval: std::ffi::c_int = 1;
unsafe {
let ret = setsockopt(
fd,
IPPROTO_TCP,
TCP_FASTOPEN_CONNECT,
&optval as *const std::ffi::c_int as *const std::ffi::c_void,
std::mem::size_of::<std::ffi::c_int>() as u32,
);
if ret != 0 {
return Err(io::Error::last_os_error());
}
}
Ok(())
}
#[cfg(target_os = "linux")]
fn bind_device(stream: &Self::TcpStream, interface: &str) -> io::Result<()> {
use socket2::SockRef;
let sock_ref = SockRef::from(stream.inner());
sock_ref.bind_device(Some(interface.as_bytes()))
}
fn from_std_tcp(stream: std::net::TcpStream) -> io::Result<Self::TcpStream> {
stream.set_nonblocking(true)?;
stream.set_nodelay(true)?;
let async_stream = smol::net::TcpStream::try_from(stream)?;
Ok(SmolIo::new(async_stream))
}
async fn connect_bound(
addr: SocketAddr,
local: std::net::IpAddr,
) -> io::Result<Self::TcpStream> {
use socket2::{Domain, Protocol, SockAddr, Socket, Type};
let std_stream = smol::unblock(move || {
let domain = if addr.is_ipv4() {
Domain::IPV4
} else {
Domain::IPV6
};
let socket = Socket::new(domain, Type::STREAM, Some(Protocol::TCP))?;
socket.bind(&SockAddr::from(std::net::SocketAddr::new(local, 0)))?;
socket.connect(&SockAddr::from(addr))?;
socket.set_tcp_nodelay(true)?;
Ok::<std::net::TcpStream, io::Error>(socket.into())
})
.await?;
std_stream.set_nonblocking(true)?;
let smol_stream = smol::net::TcpStream::try_from(std_stream)?;
Ok(SmolIo::new(smol_stream))
}
#[cfg(unix)]
type UnixStream = SmolIo<smol::net::unix::UnixStream>;
#[cfg(unix)]
async fn connect_unix(path: &std::path::Path) -> io::Result<Self::UnixStream> {
let stream = smol::net::unix::UnixStream::connect(path).await?;
Ok(SmolIo::new(stream))
}
}
pin_project! {
pub struct SmolSleep {
#[pin]
inner: async_io::Timer,
}
}
impl Future for SmolSleep {
type Output = ();
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
match self.project().inner.poll(cx) {
Poll::Ready(_instant) => Poll::Ready(()),
Poll::Pending => Poll::Pending,
}
}
}
pin_project! {
pub struct SmolIo<T> {
#[pin]
inner: T,
}
}
impl<T> SmolIo<T> {
pub fn new(inner: T) -> Self {
Self { inner }
}
pub fn inner(&self) -> &T {
&self.inner
}
}
impl<T> Read for SmolIo<T>
where
T: futures_io::AsyncRead,
{
fn poll_read(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
mut buf: rt::ReadBufCursor<'_>,
) -> Poll<io::Result<()>> {
let slice = unsafe {
let uninit = buf.as_mut();
std::ptr::write_bytes(uninit.as_mut_ptr(), 0, uninit.len());
std::slice::from_raw_parts_mut(uninit.as_mut_ptr() as *mut u8, uninit.len())
};
match futures_io::AsyncRead::poll_read(self.project().inner, cx, slice) {
Poll::Ready(Ok(n)) => {
unsafe { buf.advance(n) };
Poll::Ready(Ok(()))
}
Poll::Ready(Err(e)) => Poll::Ready(Err(e)),
Poll::Pending => Poll::Pending,
}
}
}
impl<T> Write for SmolIo<T>
where
T: futures_io::AsyncWrite,
{
fn poll_write(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<io::Result<usize>> {
futures_io::AsyncWrite::poll_write(self.project().inner, cx, buf)
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
futures_io::AsyncWrite::poll_flush(self.project().inner, cx)
}
fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
futures_io::AsyncWrite::poll_close(self.project().inner, cx)
}
}