mirror of
https://github.com/denoland/deno.git
synced 2024-10-29 08:58:01 -04:00
343 lines
9.2 KiB
Rust
343 lines
9.2 KiB
Rust
use super::dispatch_minimal::MinimalOp;
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use crate::deno_error;
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use crate::deno_error::bad_resource;
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use crate::http_util::HttpBody;
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use crate::ops::minimal_op;
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use crate::state::ThreadSafeState;
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use deno_core::ErrBox;
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use deno_core::Resource;
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use deno_core::*;
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use futures::future::FutureExt;
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use futures::ready;
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use std::future::Future;
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use std::pin::Pin;
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use std::task::Context;
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use std::task::Poll;
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use tokio::io::{AsyncRead, AsyncWrite};
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use tokio::net::TcpStream;
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use tokio_rustls::client::TlsStream as ClientTlsStream;
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use tokio_rustls::server::TlsStream as ServerTlsStream;
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#[cfg(not(windows))]
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use std::os::unix::io::FromRawFd;
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#[cfg(windows)]
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use std::os::windows::io::FromRawHandle;
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#[cfg(windows)]
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extern crate winapi;
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lazy_static! {
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/// Due to portability issues on Windows handle to stdout is created from raw file descriptor.
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/// The caveat of that approach is fact that when this handle is dropped underlying
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/// file descriptor is closed - that is highly not desirable in case of stdout.
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/// That's why we store this global handle that is then cloned when obtaining stdio
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/// for process. In turn when resource table is dropped storing reference to that handle,
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/// the handle itself won't be closed (so Deno.core.print) will still work.
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static ref STDOUT_HANDLE: std::fs::File = {
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#[cfg(not(windows))]
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let stdout = unsafe { std::fs::File::from_raw_fd(1) };
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#[cfg(windows)]
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let stdout = unsafe {
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std::fs::File::from_raw_handle(winapi::um::processenv::GetStdHandle(
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winapi::um::winbase::STD_OUTPUT_HANDLE,
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))
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};
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stdout
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};
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}
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pub fn init(i: &mut Isolate, s: &ThreadSafeState) {
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i.register_op(
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"read",
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s.core_op(minimal_op(s.stateful_minimal_op(op_read))),
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);
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i.register_op(
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"write",
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s.core_op(minimal_op(s.stateful_minimal_op(op_write))),
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);
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}
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pub fn get_stdio() -> (StreamResource, StreamResource, StreamResource) {
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let stdin = StreamResource::Stdin(tokio::io::stdin());
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let stdout = StreamResource::Stdout({
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let stdout = STDOUT_HANDLE
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.try_clone()
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.expect("Unable to clone stdout handle");
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tokio::fs::File::from_std(stdout)
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});
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let stderr = StreamResource::Stderr(tokio::io::stderr());
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(stdin, stdout, stderr)
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}
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pub enum StreamResource {
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Stdin(tokio::io::Stdin),
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Stdout(tokio::fs::File),
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Stderr(tokio::io::Stderr),
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FsFile(tokio::fs::File),
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TcpStream(tokio::net::TcpStream),
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ServerTlsStream(Box<ServerTlsStream<TcpStream>>),
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ClientTlsStream(Box<ClientTlsStream<TcpStream>>),
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HttpBody(Box<HttpBody>),
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ChildStdin(tokio::process::ChildStdin),
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ChildStdout(tokio::process::ChildStdout),
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ChildStderr(tokio::process::ChildStderr),
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}
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impl Resource for StreamResource {}
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/// `DenoAsyncRead` is the same as the `tokio_io::AsyncRead` trait
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/// but uses an `ErrBox` error instead of `std::io:Error`
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pub trait DenoAsyncRead {
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fn poll_read(
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&mut self,
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cx: &mut Context,
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buf: &mut [u8],
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) -> Poll<Result<usize, ErrBox>>;
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}
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impl DenoAsyncRead for StreamResource {
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fn poll_read(
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&mut self,
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cx: &mut Context,
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buf: &mut [u8],
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) -> Poll<Result<usize, ErrBox>> {
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use StreamResource::*;
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let mut f: Pin<Box<dyn AsyncRead>> = match self {
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FsFile(f) => Box::pin(f),
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Stdin(f) => Box::pin(f),
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TcpStream(f) => Box::pin(f),
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ClientTlsStream(f) => Box::pin(f),
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ServerTlsStream(f) => Box::pin(f),
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ChildStdout(f) => Box::pin(f),
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ChildStderr(f) => Box::pin(f),
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HttpBody(f) => Box::pin(f),
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_ => return Err(bad_resource()).into(),
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};
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let v = ready!(f.as_mut().poll_read(cx, buf))?;
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Ok(v).into()
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}
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}
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#[derive(Debug, PartialEq)]
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enum IoState {
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Pending,
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Flush,
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Done,
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}
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/// Tries to read some bytes directly into the given `buf` in asynchronous
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/// manner, returning a future type.
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///
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/// The returned future will resolve to both the I/O stream and the buffer
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/// as well as the number of bytes read once the read operation is completed.
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pub fn read<T>(state: &ThreadSafeState, rid: ResourceId, buf: T) -> Read<T>
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where
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T: AsMut<[u8]>,
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{
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Read {
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rid,
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buf,
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io_state: IoState::Pending,
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state: state.clone(),
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}
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}
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/// A future which can be used to easily read available number of bytes to fill
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/// a buffer.
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///
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/// Created by the [`read`] function.
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pub struct Read<T> {
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rid: ResourceId,
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buf: T,
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io_state: IoState,
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state: ThreadSafeState,
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}
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impl<T> Future for Read<T>
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where
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T: AsMut<[u8]> + Unpin,
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{
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type Output = Result<i32, ErrBox>;
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fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
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let inner = self.get_mut();
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if inner.io_state == IoState::Done {
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panic!("poll a Read after it's done");
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}
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let mut table = inner.state.lock_resource_table();
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let resource = table
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.get_mut::<StreamResource>(inner.rid)
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.ok_or_else(bad_resource)?;
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let nread = ready!(resource.poll_read(cx, &mut inner.buf.as_mut()[..]))?;
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inner.io_state = IoState::Done;
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Poll::Ready(Ok(nread as i32))
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}
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}
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pub fn op_read(
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state: &ThreadSafeState,
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rid: i32,
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zero_copy: Option<PinnedBuf>,
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) -> Pin<Box<MinimalOp>> {
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debug!("read rid={}", rid);
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let zero_copy = match zero_copy {
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None => {
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return futures::future::err(deno_error::no_buffer_specified()).boxed()
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}
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Some(buf) => buf,
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};
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let fut = read(state, rid as u32, zero_copy);
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fut.boxed()
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}
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/// `DenoAsyncWrite` is the same as the `tokio_io::AsyncWrite` trait
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/// but uses an `ErrBox` error instead of `std::io:Error`
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pub trait DenoAsyncWrite {
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fn poll_write(
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&mut self,
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cx: &mut Context,
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buf: &[u8],
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) -> Poll<Result<usize, ErrBox>>;
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fn poll_close(&mut self, cx: &mut Context) -> Poll<Result<(), ErrBox>>;
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fn poll_flush(&mut self, cx: &mut Context) -> Poll<Result<(), ErrBox>>;
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}
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impl DenoAsyncWrite for StreamResource {
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fn poll_write(
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&mut self,
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cx: &mut Context,
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buf: &[u8],
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) -> Poll<Result<usize, ErrBox>> {
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use StreamResource::*;
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let mut f: Pin<Box<dyn AsyncWrite>> = match self {
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FsFile(f) => Box::pin(f),
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Stdout(f) => Box::pin(f),
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Stderr(f) => Box::pin(f),
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TcpStream(f) => Box::pin(f),
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ClientTlsStream(f) => Box::pin(f),
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ServerTlsStream(f) => Box::pin(f),
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ChildStdin(f) => Box::pin(f),
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_ => return Err(bad_resource()).into(),
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};
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let v = ready!(f.as_mut().poll_write(cx, buf))?;
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Ok(v).into()
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}
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fn poll_flush(&mut self, cx: &mut Context) -> Poll<Result<(), ErrBox>> {
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use StreamResource::*;
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let mut f: Pin<Box<dyn AsyncWrite>> = match self {
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FsFile(f) => Box::pin(f),
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Stdout(f) => Box::pin(f),
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Stderr(f) => Box::pin(f),
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TcpStream(f) => Box::pin(f),
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ClientTlsStream(f) => Box::pin(f),
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ServerTlsStream(f) => Box::pin(f),
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ChildStdin(f) => Box::pin(f),
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_ => return Err(bad_resource()).into(),
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};
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ready!(f.as_mut().poll_flush(cx))?;
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Ok(()).into()
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}
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fn poll_close(&mut self, _cx: &mut Context) -> Poll<Result<(), ErrBox>> {
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unimplemented!()
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}
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}
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/// A future used to write some data to a stream.
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pub struct Write<T> {
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rid: ResourceId,
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buf: T,
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io_state: IoState,
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state: ThreadSafeState,
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nwritten: i32,
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}
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/// Creates a future that will write some of the buffer `buf` to
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/// the stream resource with `rid`.
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///
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/// Any error which happens during writing will cause both the stream and the
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/// buffer to get destroyed.
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pub fn write<T>(state: &ThreadSafeState, rid: ResourceId, buf: T) -> Write<T>
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where
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T: AsRef<[u8]>,
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{
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Write {
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rid,
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buf,
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io_state: IoState::Pending,
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state: state.clone(),
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nwritten: 0,
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}
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}
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/// This is almost the same implementation as in tokio, difference is
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/// that error type is `ErrBox` instead of `std::io::Error`.
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impl<T> Future for Write<T>
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where
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T: AsRef<[u8]> + Unpin,
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{
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type Output = Result<i32, ErrBox>;
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fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
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let inner = self.get_mut();
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if inner.io_state == IoState::Done {
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panic!("poll a Read after it's done");
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}
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if inner.io_state == IoState::Pending {
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let mut table = inner.state.lock_resource_table();
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let resource = table
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.get_mut::<StreamResource>(inner.rid)
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.ok_or_else(bad_resource)?;
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let nwritten = ready!(resource.poll_write(cx, inner.buf.as_ref()))?;
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inner.io_state = IoState::Flush;
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inner.nwritten = nwritten as i32;
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}
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// TODO(bartlomieju): this step was added during upgrade to Tokio 0.2
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// and the reasons for the need to explicitly flush are not fully known.
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// Figure out why it's needed and preferably remove it.
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// https://github.com/denoland/deno/issues/3565
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if inner.io_state == IoState::Flush {
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let mut table = inner.state.lock_resource_table();
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let resource = table
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.get_mut::<StreamResource>(inner.rid)
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.ok_or_else(bad_resource)?;
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ready!(resource.poll_flush(cx))?;
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inner.io_state = IoState::Done;
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}
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Poll::Ready(Ok(inner.nwritten))
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}
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}
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pub fn op_write(
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state: &ThreadSafeState,
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rid: i32,
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zero_copy: Option<PinnedBuf>,
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) -> Pin<Box<MinimalOp>> {
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debug!("write rid={}", rid);
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let zero_copy = match zero_copy {
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None => {
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return futures::future::err(deno_error::no_buffer_specified()).boxed()
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}
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Some(buf) => buf,
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};
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let fut = write(state, rid as u32, zero_copy);
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fut.boxed()
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}
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