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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use deno_core::error::generic_error;use deno_core::error::AnyError;use deno_core::AsyncMutFuture;use deno_core::AsyncRefCell;use deno_core::AsyncResult;use deno_core::CancelHandle;use deno_core::CancelTryFuture;use deno_core::RcRef;use deno_core::Resource;use socket2::SockRef;use std::borrow::Cow;use std::rc::Rc;use tokio::io::AsyncRead;use tokio::io::AsyncReadExt;use tokio::io::AsyncWrite;use tokio::io::AsyncWriteExt;use tokio::net::tcp;
#[cfg(unix)]use tokio::net::unix;
/// A full duplex resource has a read and write ends that are completely/// independent, like TCP/Unix sockets and TLS streams.#[derive(Debug)]pub struct FullDuplexResource<R, W> {  rd: AsyncRefCell<R>,  wr: AsyncRefCell<W>,  // When a full-duplex resource is closed, all pending 'read' ops are  // canceled, while 'write' ops are allowed to complete. Therefore only  // 'read' futures should be attached to this cancel handle.  cancel_handle: CancelHandle,}
impl<R, W> FullDuplexResource<R, W>where  R: AsyncRead + Unpin + 'static,  W: AsyncWrite + Unpin + 'static,{  pub fn new((rd, wr): (R, W)) -> Self {    Self {      rd: rd.into(),      wr: wr.into(),      cancel_handle: Default::default(),    }  }
  pub fn into_inner(self) -> (R, W) {    (self.rd.into_inner(), self.wr.into_inner())  }
  pub fn rd_borrow_mut(self: &Rc<Self>) -> AsyncMutFuture<R> {    RcRef::map(self, |r| &r.rd).borrow_mut()  }
  pub fn wr_borrow_mut(self: &Rc<Self>) -> AsyncMutFuture<W> {    RcRef::map(self, |r| &r.wr).borrow_mut()  }
  pub fn cancel_handle(self: &Rc<Self>) -> RcRef<CancelHandle> {    RcRef::map(self, |r| &r.cancel_handle)  }
  pub fn cancel_read_ops(&self) {    self.cancel_handle.cancel()  }
  pub async fn read(    self: Rc<Self>,    data: &mut [u8],  ) -> Result<usize, AnyError> {    let mut rd = self.rd_borrow_mut().await;    let nread = rd.read(data).try_or_cancel(self.cancel_handle()).await?;    Ok(nread)  }
  pub async fn write(self: Rc<Self>, data: &[u8]) -> Result<usize, AnyError> {    let mut wr = self.wr_borrow_mut().await;    let nwritten = wr.write(data).await?;    Ok(nwritten)  }
  pub async fn shutdown(self: Rc<Self>) -> Result<(), AnyError> {    let mut wr = self.wr_borrow_mut().await;    wr.shutdown().await?;    Ok(())  }}
pub type TcpStreamResource =  FullDuplexResource<tcp::OwnedReadHalf, tcp::OwnedWriteHalf>;
impl Resource for TcpStreamResource {  deno_core::impl_readable_byob!();  deno_core::impl_writable!();
  fn name(&self) -> Cow<str> {    "tcpStream".into()  }
  fn shutdown(self: Rc<Self>) -> AsyncResult<()> {    Box::pin(self.shutdown())  }
  fn close(self: Rc<Self>) {    self.cancel_read_ops();  }}
impl TcpStreamResource {  pub fn set_nodelay(self: Rc<Self>, nodelay: bool) -> Result<(), AnyError> {    self.map_socket(Box::new(move |socket| Ok(socket.set_nodelay(nodelay)?)))  }
  pub fn set_keepalive(    self: Rc<Self>,    keepalive: bool,  ) -> Result<(), AnyError> {    self      .map_socket(Box::new(move |socket| Ok(socket.set_keepalive(keepalive)?)))  }
  #[allow(clippy::type_complexity)]  fn map_socket(    self: Rc<Self>,    map: Box<dyn FnOnce(SockRef) -> Result<(), AnyError>>,  ) -> Result<(), AnyError> {    if let Some(wr) = RcRef::map(self, |r| &r.wr).try_borrow() {      let stream = wr.as_ref().as_ref();      let socket = socket2::SockRef::from(stream);
      return map(socket);    }
    Err(generic_error("Unable to get resources"))  }}
#[cfg(unix)]pub type UnixStreamResource =  FullDuplexResource<unix::OwnedReadHalf, unix::OwnedWriteHalf>;
#[cfg(not(unix))]pub struct UnixStreamResource;
#[cfg(not(unix))]impl UnixStreamResource {  fn read(self: Rc<Self>, _data: &mut [u8]) -> AsyncResult<usize> {    unreachable!()  }  fn write(self: Rc<Self>, _data: &[u8]) -> AsyncResult<usize> {    unreachable!()  }  pub async fn shutdown(self: Rc<Self>) -> Result<(), AnyError> {    unreachable!()  }  pub fn cancel_read_ops(&self) {    unreachable!()  }}
impl Resource for UnixStreamResource {  deno_core::impl_readable_byob!();  deno_core::impl_writable!();
  fn name(&self) -> Cow<str> {    "unixStream".into()  }
  fn shutdown(self: Rc<Self>) -> AsyncResult<()> {    Box::pin(self.shutdown())  }
  fn close(self: Rc<Self>) {    self.cancel_read_ops();  }}