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use std::ops::Deref;
use std::ops::DerefMut;
use std::sync::Arc;
use base::AsRawDescriptor;
use super::uring_executor::RegisteredSource;
use super::uring_executor::Result;
use super::uring_executor::UringReactor;
use crate::common_executor::RawExecutor;
use crate::mem::BackingMemory;
use crate::mem::MemRegion;
use crate::mem::VecIoWrapper;
use crate::AllocateMode;
use crate::AsyncResult;
pub struct UringSource<F: AsRawDescriptor> {
registered_source: RegisteredSource,
source: F,
}
impl<F: AsRawDescriptor> UringSource<F> {
pub fn new(io_source: F, ex: &Arc<RawExecutor<UringReactor>>) -> Result<UringSource<F>> {
let r = ex.reactor.register_source(ex, &io_source)?;
Ok(UringSource {
registered_source: r,
source: io_source,
})
}
pub async fn read_to_vec(
&self,
file_offset: Option<u64>,
vec: Vec<u8>,
) -> AsyncResult<(usize, Vec<u8>)> {
let buf = Arc::new(VecIoWrapper::from(vec));
let op = self.registered_source.start_read_to_mem(
file_offset,
buf.clone(),
[MemRegion {
offset: 0,
len: buf.len(),
}],
)?;
let len = op.await?;
let bytes = if let Ok(v) = Arc::try_unwrap(buf) {
v.into()
} else {
panic!("too many refs on buf");
};
Ok((len as usize, bytes))
}
pub async fn wait_readable(&self) -> AsyncResult<()> {
let op = self.registered_source.poll_fd_readable()?;
op.await?;
Ok(())
}
pub async fn read_to_mem(
&self,
file_offset: Option<u64>,
mem: Arc<dyn BackingMemory + Send + Sync>,
mem_offsets: impl IntoIterator<Item = MemRegion>,
) -> AsyncResult<usize> {
let op = self
.registered_source
.start_read_to_mem(file_offset, mem, mem_offsets)?;
let len = op.await?;
Ok(len as usize)
}
pub async fn write_from_vec(
&self,
file_offset: Option<u64>,
vec: Vec<u8>,
) -> AsyncResult<(usize, Vec<u8>)> {
let buf = Arc::new(VecIoWrapper::from(vec));
let op = self.registered_source.start_write_from_mem(
file_offset,
buf.clone(),
[MemRegion {
offset: 0,
len: buf.len(),
}],
)?;
let len = op.await?;
let bytes = if let Ok(v) = Arc::try_unwrap(buf) {
v.into()
} else {
panic!("too many refs on buf");
};
Ok((len as usize, bytes))
}
pub async fn write_from_mem(
&self,
file_offset: Option<u64>,
mem: Arc<dyn BackingMemory + Send + Sync>,
mem_offsets: impl IntoIterator<Item = MemRegion>,
) -> AsyncResult<usize> {
let op = self
.registered_source
.start_write_from_mem(file_offset, mem, mem_offsets)?;
let len = op.await?;
Ok(len as usize)
}
pub async fn fallocate(
&self,
file_offset: u64,
len: u64,
mode: AllocateMode,
) -> AsyncResult<()> {
let op = self
.registered_source
.start_fallocate(file_offset, len, mode.into())?;
let _ = op.await?;
Ok(())
}
pub async fn fsync(&self) -> AsyncResult<()> {
let op = self.registered_source.start_fsync()?;
let _ = op.await?;
Ok(())
}
pub async fn fdatasync(&self) -> AsyncResult<()> {
self.fsync().await
}
pub fn into_source(self) -> F {
self.source
}
pub fn as_source(&self) -> &F {
&self.source
}
pub fn as_source_mut(&mut self) -> &mut F {
&mut self.source
}
}
impl<F: AsRawDescriptor> Deref for UringSource<F> {
type Target = F;
fn deref(&self) -> &Self::Target {
&self.source
}
}
impl<F: AsRawDescriptor> DerefMut for UringSource<F> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.source
}
}
#[cfg(test)]
mod tests {
use std::fs::File;
use std::fs::OpenOptions;
use std::future::Future;
use std::path::PathBuf;
use std::pin::Pin;
use std::task::Context;
use std::task::Poll;
use std::task::Waker;
use sync::Mutex;
use super::super::uring_executor::is_uring_stable;
use super::super::UringSource;
use super::*;
use crate::Executor;
use crate::ExecutorKind;
use crate::IoSource;
async fn read_u64<T: AsRawDescriptor>(source: &UringSource<T>) -> u64 {
let u64_mem = vec![0xffu8; std::mem::size_of::<u64>()];
let (ret, u64_mem) = source.read_to_vec(None, u64_mem).await.unwrap();
assert_eq!(ret, std::mem::size_of::<u64>());
let mut val = 0u64.to_ne_bytes();
val.copy_from_slice(&u64_mem);
u64::from_ne_bytes(val)
}
#[test]
fn event() {
if !is_uring_stable() {
return;
}
use base::Event;
use base::EventExt;
async fn write_event(ev: Event, wait: Event, ex: &Arc<RawExecutor<UringReactor>>) {
let wait = UringSource::new(wait, ex).unwrap();
ev.write_count(55).unwrap();
read_u64(&wait).await;
ev.write_count(66).unwrap();
read_u64(&wait).await;
ev.write_count(77).unwrap();
read_u64(&wait).await;
}
async fn read_events(ev: Event, signal: Event, ex: &Arc<RawExecutor<UringReactor>>) {
let source = UringSource::new(ev, ex).unwrap();
assert_eq!(read_u64(&source).await, 55);
signal.signal().unwrap();
assert_eq!(read_u64(&source).await, 66);
signal.signal().unwrap();
assert_eq!(read_u64(&source).await, 77);
signal.signal().unwrap();
}
let event = Event::new().unwrap();
let signal_wait = Event::new().unwrap();
let ex = RawExecutor::<UringReactor>::new().unwrap();
let write_task = write_event(
event.try_clone().unwrap(),
signal_wait.try_clone().unwrap(),
&ex,
);
let read_task = read_events(event, signal_wait, &ex);
ex.run_until(futures::future::join(read_task, write_task))
.unwrap();
}
#[test]
fn pend_on_pipe() {
if !is_uring_stable() {
return;
}
use std::io::Write;
use futures::future::Either;
async fn do_test(ex: &Arc<RawExecutor<UringReactor>>) {
let (read_source, mut w) = base::pipe(true).unwrap();
let source = UringSource::new(read_source, ex).unwrap();
let done = Box::pin(async { 5usize });
let pending = Box::pin(read_u64(&source));
match futures::future::select(pending, done).await {
Either::Right((5, pending)) => {
w.write_all(&[0]).expect("failed to write to pipe");
::std::mem::drop(pending);
}
_ => panic!("unexpected select result"),
};
}
let ex = RawExecutor::<UringReactor>::new().unwrap();
ex.run_until(do_test(&ex)).unwrap();
}
#[test]
fn range_error() {
if !is_uring_stable() {
return;
}
async fn go(ex: &Arc<RawExecutor<UringReactor>>) {
let f = File::open("/dev/zero").unwrap();
let source = UringSource::new(f, ex).unwrap();
let v = vec![0x55u8; 64];
let vw = Arc::new(VecIoWrapper::from(v));
let ret = source
.read_to_mem(
None,
Arc::<VecIoWrapper>::clone(&vw),
[MemRegion {
offset: 32,
len: 33,
}],
)
.await;
assert!(ret.is_err());
}
let ex = RawExecutor::<UringReactor>::new().unwrap();
ex.run_until(go(&ex)).unwrap();
}
#[test]
fn fallocate() {
if !is_uring_stable() {
return;
}
async fn go(ex: &Arc<RawExecutor<UringReactor>>) {
let dir = tempfile::TempDir::new().unwrap();
let mut file_path = PathBuf::from(dir.path());
file_path.push("test");
let f = OpenOptions::new()
.create(true)
.write(true)
.open(&file_path)
.unwrap();
let source = UringSource::new(f, ex).unwrap();
if let Err(e) = source.fallocate(0, 4096, AllocateMode::Allocate).await {
match e {
crate::io_ext::Error::Uring(super::super::uring_executor::Error::Io(
io_err,
)) => {
if io_err.kind() == std::io::ErrorKind::InvalidInput {
return;
}
}
_ => panic!("Unexpected uring error on fallocate: {}", e),
}
}
let meta_data = std::fs::metadata(&file_path).unwrap();
assert_eq!(meta_data.len(), 4096);
}
let ex = RawExecutor::<UringReactor>::new().unwrap();
ex.run_until(go(&ex)).unwrap();
}
#[test]
fn wait_read() {
if !is_uring_stable() {
return;
}
async fn go(ex: &Arc<RawExecutor<UringReactor>>) {
let f = File::open("/dev/zero").unwrap();
let source = UringSource::new(f, ex).unwrap();
source.wait_readable().await.unwrap();
}
let ex = RawExecutor::<UringReactor>::new().unwrap();
ex.run_until(go(&ex)).unwrap();
}
struct State {
should_quit: bool,
waker: Option<Waker>,
}
impl State {
fn wake(&mut self) {
self.should_quit = true;
let waker = self.waker.take();
if let Some(waker) = waker {
waker.wake();
}
}
}
struct Quit {
state: Arc<Mutex<State>>,
}
impl Future for Quit {
type Output = ();
fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<()> {
let mut state = self.state.lock();
if state.should_quit {
return Poll::Ready(());
}
state.waker = Some(cx.waker().clone());
Poll::Pending
}
}
#[cfg(any(target_os = "android", target_os = "linux"))]
#[test]
fn await_uring_from_poll() {
if !is_uring_stable() {
return;
}
async fn go(source: IoSource<File>) {
let v = vec![0xa4u8; 16];
let (len, vec) = source.read_to_vec(None, v).await.unwrap();
assert_eq!(len, 16);
assert!(vec.iter().all(|&b| b == 0));
}
let state = Arc::new(Mutex::new(State {
should_quit: false,
waker: None,
}));
let uring_ex = Executor::with_executor_kind(ExecutorKind::Uring).unwrap();
let f = File::open("/dev/zero").unwrap();
let source = uring_ex.async_from(f).unwrap();
let quit = Quit {
state: state.clone(),
};
let handle = std::thread::spawn(move || uring_ex.run_until(quit));
let poll_ex = Executor::with_executor_kind(ExecutorKind::Fd).unwrap();
poll_ex.run_until(go(source)).unwrap();
state.lock().wake();
handle.join().unwrap().unwrap();
}
#[cfg(any(target_os = "android", target_os = "linux"))]
#[test]
fn await_poll_from_uring() {
if !is_uring_stable() {
return;
}
async fn go(source: IoSource<File>) {
let v = vec![0x2cu8; 16];
let (len, vec) = source.read_to_vec(None, v).await.unwrap();
assert_eq!(len, 16);
assert!(vec.iter().all(|&b| b == 0));
}
let state = Arc::new(Mutex::new(State {
should_quit: false,
waker: None,
}));
let poll_ex = Executor::with_executor_kind(ExecutorKind::Fd).unwrap();
let f = File::open("/dev/zero").unwrap();
let source = poll_ex.async_from(f).unwrap();
let quit = Quit {
state: state.clone(),
};
let handle = std::thread::spawn(move || poll_ex.run_until(quit));
let uring_ex = Executor::with_executor_kind(ExecutorKind::Uring).unwrap();
uring_ex.run_until(go(source)).unwrap();
state.lock().wake();
handle.join().unwrap().unwrap();
}
}