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pub mod uring;
use std::future::Future;
use std::os::unix::io::FromRawFd;
use std::{io, net, ops, time};
use futures::executor;
use futures::task::LocalSpawn;
use nix::sys::socket;
pub fn run<C, F>(c: C) -> anyhow::Result<()>
where
C: FnOnce(Context) -> F,
F: Future<Output = ()> + 'static,
{
let mut runner = Runner::new(4096)?;
runner.spawn(c);
runner.run()
}
pub struct Runner {
uring: uring::Uring,
pool: executor::LocalPool,
}
impl Runner {
pub fn new(size: u32) -> anyhow::Result<Self> {
let uring = uring::Uring::new(size)?;
let pool = executor::LocalPool::new();
Ok(Self { uring, pool })
}
pub fn spawn<C, F>(&mut self, c: C)
where
C: FnOnce(Context) -> F,
F: Future<Output = ()> + 'static,
{
let context = Context::new(self.uring.clone(), self.pool.spawner());
let f = c(context);
self.pool
.spawner()
.spawn_local_obj(Box::pin(f).into())
.expect("failed to spawn");
}
pub fn run(&mut self) -> anyhow::Result<()> {
loop {
self.pool.run_until_stalled();
let count = self.uring.submit_and_wait()?;
if count == 0 {
anyhow::bail!("no more pending IO");
}
}
}
}
#[derive(Clone)]
pub struct Context {
uring: uring::Uring,
spawner: executor::LocalSpawner,
}
impl Context {
pub fn new(uring: uring::Uring, spawner: executor::LocalSpawner) -> Self {
Self { uring, spawner }
}
pub fn spawn<C, F>(&mut self, c: C)
where
C: FnOnce(Context) -> F,
F: Future<Output = ()> + 'static,
{
let f = c(self.clone());
self.spawner
.spawn_local_obj(Box::pin(f).into())
.expect("failed to spawn");
}
pub async fn accept(
&mut self,
socket: &mut net::TcpListener,
) -> io::Result<net::TcpStream> {
let submission = uring::Submission::Accept { socket };
let task = self.uring.run(submission, uring::Flags::empty());
match task.await? {
uring::Completion::Accept { stream } => Ok(stream),
_ => unreachable!(),
}
}
pub fn buffer(&mut self, size: usize) -> Box<[u8]> {
vec![0; size].into_boxed_slice()
}
pub async fn connect<A>(&mut self, addr: A) -> anyhow::Result<net::TcpStream>
where
A: net::ToSocketAddrs,
{
let fd = socket::socket(
socket::AddressFamily::Inet,
socket::SockType::Stream,
socket::SockFlag::empty(),
socket::SockProtocol::Tcp,
)?;
let socket = unsafe { net::TcpStream::from_raw_fd(fd) };
let addr = addr.to_socket_addrs()?.next().unwrap();
let submission = uring::Submission::Connect { socket: socket, addr: addr };
let task = self.uring.run(submission, uring::Flags::empty());
match task.await? {
uring::Completion::Connect { stream } => Ok(stream),
_ => unreachable!(),
}
}
pub fn listen<A>(&mut self, addr: A) -> io::Result<net::TcpListener>
where
A: net::ToSocketAddrs,
{
net::TcpListener::bind(addr)
}
pub async fn read(&mut self, stream: &mut net::TcpStream, buffer: &mut [u8]) -> io::Result<usize> {
let submission = uring::Submission::Read {
stream,
buffer,
};
let task = self.uring.run(submission, uring::Flags::empty());
match task.await? {
uring::Completion::Read { size } => Ok(size),
_ => unreachable!(),
}
}
pub async fn read_full(
&mut self,
stream: &mut net::TcpStream,
buffer: &mut [u8],
) -> io::Result<usize>
{
self.read(stream, buffer).await
}
pub fn read_close(&self, stream: &mut net::TcpStream) -> io::Result<()> {
stream.shutdown(net::Shutdown::Read)
}
pub async fn write(
&mut self,
stream: &mut net::TcpStream,
buffer: &[u8],
) -> io::Result<usize>
{
let submission = uring::Submission::Write {
stream,
buffer,
};
let task = self.uring.run(submission, uring::Flags::empty());
match task.await? {
uring::Completion::Write { size } => Ok(size),
_ => unreachable!(),
}
}
pub async fn write_then(
&mut self,
stream: &mut net::TcpStream,
buffer: &[u8],
) -> io::Result<usize>
{
let submission = uring::Submission::Write{stream, buffer};
let task = self.uring.run(submission, uring::Flags::IO_LINK);
match task.await? {
uring::Completion::Write { size } => Ok(size),
_ => unreachable!(),
}
}
pub async fn write_full(
&mut self,
stream: &mut net::TcpStream,
buffer: &[u8],
) -> io::Result<()>
{
self.write(stream, buffer).await?;
Ok(())
}
pub fn write_close(&self, stream: &mut net::TcpStream) -> io::Result<()> {
stream.shutdown(net::Shutdown::Write)
}
pub fn cancel(&mut self) {
}
pub fn timeout(&mut self, _expires: time::Duration) -> Self {
self.clone()
}
}
fn _range_bounds<R>(range: R, min: usize, max: usize) -> ops::Range<usize>
where
R: ops::RangeBounds<usize>,
{
let start = match range.start_bound() {
ops::Bound::Included(n) => *n,
ops::Bound::Excluded(n) => n + 1,
ops::Bound::Unbounded => min,
};
let end = match range.end_bound() {
ops::Bound::Included(n) => n + 1,
ops::Bound::Excluded(n) => *n,
ops::Bound::Unbounded => max,
};
start..end
}