use std::cell::{Cell, RefCell};
use std::sync::{Arc, Mutex};
use std::task::{ready, Context, Poll, Waker};
use std::{any, cmp, fmt, future::Future, io, mem, net, pin::Pin, rc::Rc};
use ntex_bytes::{Buf, BufMut, Bytes, BytesVec};
use ntex_util::future::poll_fn;
use ntex_util::time::{sleep, Millis, Sleep};
use crate::{types, Handle, IoStream, ReadContext, ReadStatus, WriteContext, WriteStatus};
#[derive(Default)]
struct AtomicWaker(Arc<Mutex<RefCell<Option<Waker>>>>);
impl AtomicWaker {
fn wake(&self) {
if let Some(waker) = self.0.lock().unwrap().borrow_mut().take() {
waker.wake()
}
}
}
impl fmt::Debug for AtomicWaker {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "AtomicWaker")
}
}
#[derive(Debug)]
pub struct IoTest {
tp: Type,
peer_addr: Option<net::SocketAddr>,
state: Arc<Cell<State>>,
local: Arc<Mutex<RefCell<Channel>>>,
remote: Arc<Mutex<RefCell<Channel>>>,
}
bitflags::bitflags! {
struct IoTestFlags: u8 {
const FLUSHED = 0b0000_0001;
const CLOSED = 0b0000_0010;
}
}
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
enum Type {
Client,
Server,
ClientClone,
ServerClone,
}
#[derive(Copy, Clone, Default, Debug)]
struct State {
client_dropped: bool,
server_dropped: bool,
}
#[derive(Default, Debug)]
struct Channel {
buf: BytesVec,
buf_cap: usize,
flags: IoTestFlags,
waker: AtomicWaker,
read: IoTestState,
write: IoTestState,
}
impl Channel {
fn is_closed(&self) -> bool {
self.flags.contains(IoTestFlags::CLOSED)
}
}
impl Default for IoTestFlags {
fn default() -> Self {
IoTestFlags::empty()
}
}
#[derive(Debug)]
enum IoTestState {
Ok,
Pending,
Close,
Err(io::Error),
}
impl Default for IoTestState {
fn default() -> Self {
IoTestState::Ok
}
}
impl IoTest {
pub fn create() -> (IoTest, IoTest) {
let local = Arc::new(Mutex::new(RefCell::new(Channel::default())));
let remote = Arc::new(Mutex::new(RefCell::new(Channel::default())));
let state = Arc::new(Cell::new(State::default()));
(
IoTest {
tp: Type::Client,
peer_addr: None,
local: local.clone(),
remote: remote.clone(),
state: state.clone(),
},
IoTest {
state,
peer_addr: None,
tp: Type::Server,
local: remote,
remote: local,
},
)
}
pub fn is_client_dropped(&self) -> bool {
self.state.get().client_dropped
}
pub fn is_server_dropped(&self) -> bool {
self.state.get().server_dropped
}
pub fn is_closed(&self) -> bool {
self.remote.lock().unwrap().borrow().is_closed()
}
pub fn set_peer_addr(mut self, addr: net::SocketAddr) -> Self {
self.peer_addr = Some(addr);
self
}
pub fn read_pending(&self) {
self.remote.lock().unwrap().borrow_mut().read = IoTestState::Pending;
}
pub fn read_error(&self, err: io::Error) {
let channel = self.remote.lock().unwrap();
channel.borrow_mut().read = IoTestState::Err(err);
channel.borrow().waker.wake();
}
pub fn write_error(&self, err: io::Error) {
self.local.lock().unwrap().borrow_mut().write = IoTestState::Err(err);
self.remote.lock().unwrap().borrow().waker.wake();
}
pub fn local_buffer<F, R>(&self, f: F) -> R
where
F: FnOnce(&mut BytesVec) -> R,
{
let guard = self.local.lock().unwrap();
let mut ch = guard.borrow_mut();
f(&mut ch.buf)
}
pub fn remote_buffer<F, R>(&self, f: F) -> R
where
F: FnOnce(&mut BytesVec) -> R,
{
let guard = self.remote.lock().unwrap();
let mut ch = guard.borrow_mut();
f(&mut ch.buf)
}
pub async fn close(&self) {
{
let guard = self.remote.lock().unwrap();
let mut remote = guard.borrow_mut();
remote.read = IoTestState::Close;
remote.waker.wake();
log::trace!("close remote socket");
}
sleep(Millis(35)).await;
}
pub fn write<T: AsRef<[u8]>>(&self, data: T) {
let guard = self.remote.lock().unwrap();
let mut write = guard.borrow_mut();
write.buf.extend_from_slice(data.as_ref());
write.waker.wake();
}
pub fn remote_buffer_cap(&self, cap: usize) {
self.local.lock().unwrap().borrow_mut().buf_cap = cap;
self.remote.lock().unwrap().borrow().waker.wake();
}
pub fn read_any(&self) -> Bytes {
self.local.lock().unwrap().borrow_mut().buf.split().freeze()
}
pub async fn read(&self) -> Result<Bytes, io::Error> {
if self.local.lock().unwrap().borrow().buf.is_empty() {
poll_fn(|cx| {
let guard = self.local.lock().unwrap();
let read = guard.borrow_mut();
if read.buf.is_empty() {
let closed = match self.tp {
Type::Client | Type::ClientClone => {
self.is_server_dropped() || read.is_closed()
}
Type::Server | Type::ServerClone => self.is_client_dropped(),
};
if closed {
Poll::Ready(())
} else {
*read.waker.0.lock().unwrap().borrow_mut() =
Some(cx.waker().clone());
drop(read);
drop(guard);
Poll::Pending
}
} else {
Poll::Ready(())
}
})
.await;
}
Ok(self.local.lock().unwrap().borrow_mut().buf.split().freeze())
}
pub fn poll_read_buf(
&self,
cx: &mut Context<'_>,
buf: &mut BytesVec,
) -> Poll<io::Result<usize>> {
let guard = self.local.lock().unwrap();
let mut ch = guard.borrow_mut();
*ch.waker.0.lock().unwrap().borrow_mut() = Some(cx.waker().clone());
if !ch.buf.is_empty() {
let size = std::cmp::min(ch.buf.len(), buf.remaining_mut());
let b = ch.buf.split_to(size);
buf.put_slice(&b);
return Poll::Ready(Ok(size));
}
match mem::take(&mut ch.read) {
IoTestState::Ok => Poll::Pending,
IoTestState::Close => {
ch.read = IoTestState::Close;
Poll::Ready(Ok(0))
}
IoTestState::Pending => Poll::Pending,
IoTestState::Err(e) => Poll::Ready(Err(e)),
}
}
pub fn poll_write_buf(
&self,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<io::Result<usize>> {
let guard = self.remote.lock().unwrap();
let mut ch = guard.borrow_mut();
match mem::take(&mut ch.write) {
IoTestState::Ok => {
let cap = cmp::min(buf.len(), ch.buf_cap);
if cap > 0 {
ch.buf.extend(&buf[..cap]);
ch.buf_cap -= cap;
ch.flags.remove(IoTestFlags::FLUSHED);
ch.waker.wake();
Poll::Ready(Ok(cap))
} else {
*self
.local
.lock()
.unwrap()
.borrow_mut()
.waker
.0
.lock()
.unwrap()
.borrow_mut() = Some(cx.waker().clone());
Poll::Pending
}
}
IoTestState::Close => Poll::Ready(Ok(0)),
IoTestState::Pending => {
*self
.local
.lock()
.unwrap()
.borrow_mut()
.waker
.0
.lock()
.unwrap()
.borrow_mut() = Some(cx.waker().clone());
Poll::Pending
}
IoTestState::Err(e) => Poll::Ready(Err(e)),
}
}
}
impl Clone for IoTest {
fn clone(&self) -> Self {
let tp = match self.tp {
Type::Server => Type::ServerClone,
Type::Client => Type::ClientClone,
val => val,
};
IoTest {
tp,
local: self.local.clone(),
remote: self.remote.clone(),
state: self.state.clone(),
peer_addr: self.peer_addr,
}
}
}
impl Drop for IoTest {
fn drop(&mut self) {
let mut state = self.state.get();
match self.tp {
Type::Server => state.server_dropped = true,
Type::Client => state.client_dropped = true,
_ => (),
}
self.state.set(state);
let guard = self.remote.lock().unwrap();
let mut remote = guard.borrow_mut();
remote.read = IoTestState::Close;
remote.waker.wake();
log::trace!("drop remote socket");
}
}
impl IoStream for IoTest {
fn start(self, read: ReadContext, write: WriteContext) -> Option<Box<dyn Handle>> {
let io = Rc::new(self);
ntex_util::spawn(ReadTask {
io: io.clone(),
state: read,
});
ntex_util::spawn(WriteTask {
io: io.clone(),
state: write,
st: IoWriteState::Processing(None),
});
Some(Box::new(io))
}
}
impl Handle for Rc<IoTest> {
fn query(&self, id: any::TypeId) -> Option<Box<dyn any::Any>> {
if id == any::TypeId::of::<types::PeerAddr>() {
if let Some(addr) = self.peer_addr {
return Some(Box::new(types::PeerAddr(addr)));
}
}
None
}
}
struct ReadTask {
io: Rc<IoTest>,
state: ReadContext,
}
impl Future for ReadTask {
type Output = ();
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let this = self.as_ref();
this.state.with_buf(|buf, hw, lw| {
match this.state.poll_ready(cx) {
Poll::Ready(ReadStatus::Terminate) => {
log::trace!("read task is instructed to terminate");
Poll::Ready(Ok(()))
}
Poll::Ready(ReadStatus::Ready) => {
let io = &this.io;
let mut new_bytes = 0;
loop {
let remaining = buf.remaining_mut();
if remaining < lw {
buf.reserve(hw - remaining);
}
match io.poll_read_buf(cx, buf) {
Poll::Pending => {
log::trace!(
"no more data in io stream, read: {:?}",
new_bytes
);
break;
}
Poll::Ready(Ok(n)) => {
if n == 0 {
log::trace!("io stream is disconnected");
return Poll::Ready(Ok(()));
} else {
new_bytes += n;
if buf.len() >= hw {
log::trace!(
"high water mark pause reading, read: {:?}",
new_bytes
);
break;
}
}
}
Poll::Ready(Err(err)) => {
log::trace!("read task failed on io {:?}", err);
return Poll::Ready(Err(err));
}
}
}
Poll::Pending
}
Poll::Pending => Poll::Pending,
}
})
}
}
#[derive(Debug)]
enum IoWriteState {
Processing(Option<Sleep>),
Shutdown(Option<Sleep>, Shutdown),
}
#[derive(Debug)]
enum Shutdown {
None,
Flushed,
Stopping,
}
struct WriteTask {
st: IoWriteState,
io: Rc<IoTest>,
state: WriteContext,
}
impl Future for WriteTask {
type Output = ();
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let mut this = self.as_mut().get_mut();
match this.st {
IoWriteState::Processing(ref mut delay) => {
match this.state.poll_ready(cx) {
Poll::Ready(WriteStatus::Ready) => {
match ready!(flush_io(&this.io, &this.state, cx)) {
Ok(()) => Poll::Pending,
Err(e) => {
this.state.close(Some(e));
Poll::Ready(())
}
}
}
Poll::Ready(WriteStatus::Timeout(time)) => {
if delay.is_none() {
*delay = Some(sleep(time));
}
self.poll(cx)
}
Poll::Ready(WriteStatus::Shutdown(time)) => {
log::trace!("write task is instructed to shutdown");
let timeout = if let Some(delay) = delay.take() {
delay
} else {
sleep(time)
};
this.st = IoWriteState::Shutdown(Some(timeout), Shutdown::None);
self.poll(cx)
}
Poll::Ready(WriteStatus::Terminate) => {
log::trace!("write task is instructed to terminate");
this.io
.local
.lock()
.unwrap()
.borrow_mut()
.flags
.insert(IoTestFlags::CLOSED);
this.state.close(None);
Poll::Ready(())
}
Poll::Pending => Poll::Pending,
}
}
IoWriteState::Shutdown(ref mut delay, ref mut st) => {
loop {
match st {
Shutdown::None => {
match flush_io(&this.io, &this.state, cx) {
Poll::Ready(Ok(())) => {
*st = Shutdown::Flushed;
continue;
}
Poll::Ready(Err(err)) => {
log::trace!(
"write task is closed with err during flush {:?}",
err
);
this.state.close(Some(err));
return Poll::Ready(());
}
Poll::Pending => (),
}
}
Shutdown::Flushed => {
this.io
.local
.lock()
.unwrap()
.borrow_mut()
.flags
.insert(IoTestFlags::CLOSED);
*st = Shutdown::Stopping;
continue;
}
Shutdown::Stopping => {
let io = &this.io;
loop {
let mut buf = BytesVec::new();
match io.poll_read_buf(cx, &mut buf) {
Poll::Ready(Err(e)) => {
this.state.close(Some(e));
log::trace!("write task is stopped");
return Poll::Ready(());
}
Poll::Ready(Ok(n)) if n == 0 => {
this.state.close(None);
log::trace!("write task is stopped");
return Poll::Ready(());
}
Poll::Pending => break,
_ => (),
}
}
}
}
if let Some(ref delay) = delay {
if delay.poll_elapsed(cx).is_pending() {
return Poll::Pending;
}
}
log::trace!("write task is stopped after delay");
this.state.close(None);
return Poll::Ready(());
}
}
}
}
}
pub(super) fn flush_io(
io: &IoTest,
state: &WriteContext,
cx: &mut Context<'_>,
) -> Poll<io::Result<()>> {
state.with_buf(|buf| {
if let Some(buf) = buf {
let len = buf.len();
if len != 0 {
log::trace!("flushing framed transport: {}", len);
let mut written = 0;
let result = loop {
break match io.poll_write_buf(cx, &buf[written..]) {
Poll::Ready(Ok(n)) => {
if n == 0 {
log::trace!(
"disconnected during flush, written {}",
written
);
Poll::Ready(Err(io::Error::new(
io::ErrorKind::WriteZero,
"failed to write frame to transport",
)))
} else {
written += n;
if written == len {
buf.clear();
Poll::Ready(Ok(()))
} else {
continue;
}
}
}
Poll::Pending => {
buf.advance(written);
Poll::Pending
}
Poll::Ready(Err(e)) => {
log::trace!("error during flush: {}", e);
Poll::Ready(Err(e))
}
};
};
log::trace!("flushed {} bytes", written);
return result;
}
}
Poll::Ready(Ok(()))
})
}
#[cfg(test)]
#[allow(clippy::redundant_clone)]
mod tests {
use super::*;
use ntex_util::future::lazy;
#[ntex::test]
async fn basic() {
let (client, server) = IoTest::create();
assert_eq!(client.tp, Type::Client);
assert_eq!(client.clone().tp, Type::ClientClone);
assert_eq!(server.tp, Type::Server);
assert_eq!(server.clone().tp, Type::ServerClone);
assert!(format!("{:?}", server).contains("IoTest"));
assert!(format!("{:?}", AtomicWaker::default()).contains("AtomicWaker"));
server.read_pending();
let mut buf = BytesVec::new();
let res = lazy(|cx| client.poll_read_buf(cx, &mut buf)).await;
assert!(res.is_pending());
server.read_pending();
let res = lazy(|cx| server.poll_write_buf(cx, b"123")).await;
assert!(res.is_pending());
assert!(!server.is_client_dropped());
drop(client);
assert!(server.is_client_dropped());
let server2 = server.clone();
assert!(!server2.is_server_dropped());
drop(server);
assert!(server2.is_server_dropped());
let res = lazy(|cx| server2.poll_write_buf(cx, b"123")).await;
assert!(res.is_pending());
}
}