mirror of
https://github.com/denoland/deno.git
synced 2024-11-22 15:06:54 -05:00
540 lines
13 KiB
Rust
540 lines
13 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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use deno_core::error::AnyError;
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use deno_core::op;
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use deno_core::parking_lot::Mutex;
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use deno_core::AsyncMutFuture;
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use deno_core::AsyncRefCell;
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use deno_core::AsyncResult;
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use deno_core::CancelHandle;
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use deno_core::CancelTryFuture;
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use deno_core::Extension;
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use deno_core::OpState;
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use deno_core::RcRef;
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use deno_core::Resource;
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use deno_core::ResourceId;
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use deno_core::ZeroCopyBuf;
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use once_cell::sync::Lazy;
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use std::borrow::Cow;
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use std::cell::RefCell;
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use std::fs::File as StdFile;
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use std::io::ErrorKind;
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use std::io::Read;
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use std::io::Write;
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use std::rc::Rc;
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use std::sync::Arc;
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use tokio::io::AsyncRead;
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use tokio::io::AsyncReadExt;
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use tokio::io::AsyncWrite;
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use tokio::io::AsyncWriteExt;
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use tokio::process;
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#[cfg(unix)]
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use std::os::unix::io::FromRawFd;
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#[cfg(windows)]
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use {
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std::os::windows::io::FromRawHandle,
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winapi::um::{processenv::GetStdHandle, winbase},
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};
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// Store the stdio fd/handles in global statics in order to keep them
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// alive for the duration of the application since the last handle/fd
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// being dropped will close the corresponding pipe.
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#[cfg(unix)]
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static STDIN_HANDLE: Lazy<StdFile> =
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Lazy::new(|| unsafe { StdFile::from_raw_fd(0) });
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#[cfg(unix)]
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static STDOUT_HANDLE: Lazy<StdFile> =
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Lazy::new(|| unsafe { StdFile::from_raw_fd(1) });
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#[cfg(unix)]
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static STDERR_HANDLE: Lazy<StdFile> =
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Lazy::new(|| unsafe { StdFile::from_raw_fd(2) });
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#[cfg(windows)]
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static STDIN_HANDLE: Lazy<StdFile> = Lazy::new(|| unsafe {
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StdFile::from_raw_handle(GetStdHandle(winbase::STD_INPUT_HANDLE))
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});
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#[cfg(windows)]
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static STDOUT_HANDLE: Lazy<StdFile> = Lazy::new(|| unsafe {
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StdFile::from_raw_handle(GetStdHandle(winbase::STD_OUTPUT_HANDLE))
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});
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#[cfg(windows)]
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static STDERR_HANDLE: Lazy<StdFile> = Lazy::new(|| unsafe {
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StdFile::from_raw_handle(GetStdHandle(winbase::STD_ERROR_HANDLE))
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});
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pub fn init() -> Extension {
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Extension::builder()
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.ops(vec![op_read_sync::decl(), op_write_sync::decl()])
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.build()
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}
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pub enum StdioPipe {
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Inherit,
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File(StdFile),
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}
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impl Default for StdioPipe {
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fn default() -> Self {
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Self::Inherit
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}
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}
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impl Clone for StdioPipe {
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fn clone(&self) -> Self {
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match self {
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StdioPipe::Inherit => StdioPipe::Inherit,
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StdioPipe::File(pipe) => StdioPipe::File(pipe.try_clone().unwrap()),
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}
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}
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}
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/// Specify how stdin, stdout, and stderr are piped.
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/// By default, inherits from the process.
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#[derive(Clone, Default)]
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pub struct Stdio {
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pub stdin: StdioPipe,
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pub stdout: StdioPipe,
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pub stderr: StdioPipe,
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}
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pub fn init_stdio(stdio: Stdio) -> Extension {
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// todo(dsheret): don't do this? Taking out the writers was necessary to prevent invalid handle panics
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let stdio = Rc::new(RefCell::new(Some(stdio)));
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Extension::builder()
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.middleware(|op| match op.name {
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"op_print" => op_print::decl(),
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_ => op,
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})
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.state(move |state| {
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let stdio = stdio
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.borrow_mut()
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.take()
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.expect("Extension only supports being used once.");
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let t = &mut state.resource_table;
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t.add(StdFileResource::stdio(
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match stdio.stdin {
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StdioPipe::Inherit => StdFileResourceInner::Stdin(Arc::new(
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Mutex::new(STDIN_HANDLE.try_clone().unwrap()),
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)),
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StdioPipe::File(pipe) => StdFileResourceInner::file(pipe),
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},
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"stdin",
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));
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t.add(StdFileResource::stdio(
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match stdio.stdout {
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StdioPipe::Inherit => StdFileResourceInner::Stdout,
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StdioPipe::File(pipe) => StdFileResourceInner::file(pipe),
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},
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"stdout",
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));
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t.add(StdFileResource::stdio(
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match stdio.stderr {
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StdioPipe::Inherit => StdFileResourceInner::Stderr,
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StdioPipe::File(pipe) => StdFileResourceInner::file(pipe),
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},
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"stderr",
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));
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Ok(())
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})
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.build()
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}
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#[cfg(unix)]
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use nix::sys::termios;
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#[derive(Default)]
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pub struct TtyMetadata {
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#[cfg(unix)]
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pub mode: Option<termios::Termios>,
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}
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#[derive(Default)]
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pub struct FileMetadata {
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pub tty: TtyMetadata,
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}
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#[derive(Debug)]
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pub struct WriteOnlyResource<S> {
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stream: AsyncRefCell<S>,
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}
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impl<S: 'static> From<S> for WriteOnlyResource<S> {
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fn from(stream: S) -> Self {
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Self {
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stream: stream.into(),
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}
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}
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}
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impl<S> WriteOnlyResource<S>
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where
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S: AsyncWrite + Unpin + 'static,
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{
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pub fn borrow_mut(self: &Rc<Self>) -> AsyncMutFuture<S> {
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RcRef::map(self, |r| &r.stream).borrow_mut()
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}
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async fn write(self: Rc<Self>, buf: ZeroCopyBuf) -> Result<usize, AnyError> {
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let mut stream = self.borrow_mut().await;
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let nwritten = stream.write(&buf).await?;
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Ok(nwritten)
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}
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async fn shutdown(self: Rc<Self>) -> Result<(), AnyError> {
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let mut stream = self.borrow_mut().await;
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stream.shutdown().await?;
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Ok(())
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}
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pub fn into_inner(self) -> S {
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self.stream.into_inner()
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}
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}
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#[derive(Debug)]
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pub struct ReadOnlyResource<S> {
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stream: AsyncRefCell<S>,
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cancel_handle: CancelHandle,
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}
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impl<S: 'static> From<S> for ReadOnlyResource<S> {
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fn from(stream: S) -> Self {
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Self {
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stream: stream.into(),
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cancel_handle: Default::default(),
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}
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}
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}
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impl<S> ReadOnlyResource<S>
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where
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S: AsyncRead + Unpin + 'static,
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{
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pub fn borrow_mut(self: &Rc<Self>) -> AsyncMutFuture<S> {
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RcRef::map(self, |r| &r.stream).borrow_mut()
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}
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pub fn cancel_handle(self: &Rc<Self>) -> RcRef<CancelHandle> {
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RcRef::map(self, |r| &r.cancel_handle)
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}
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pub fn cancel_read_ops(&self) {
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self.cancel_handle.cancel()
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}
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async fn read(
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self: Rc<Self>,
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mut buf: ZeroCopyBuf,
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) -> Result<(usize, ZeroCopyBuf), AnyError> {
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let mut rd = self.borrow_mut().await;
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let nread = rd
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.read(&mut buf)
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.try_or_cancel(self.cancel_handle())
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.await?;
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Ok((nread, buf))
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}
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pub fn into_inner(self) -> S {
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self.stream.into_inner()
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}
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}
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pub type ChildStdinResource = WriteOnlyResource<process::ChildStdin>;
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impl Resource for ChildStdinResource {
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fn name(&self) -> Cow<str> {
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"childStdin".into()
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}
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fn write(self: Rc<Self>, buf: ZeroCopyBuf) -> AsyncResult<usize> {
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Box::pin(self.write(buf))
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}
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fn shutdown(self: Rc<Self>) -> AsyncResult<()> {
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Box::pin(self.shutdown())
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}
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}
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pub type ChildStdoutResource = ReadOnlyResource<process::ChildStdout>;
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impl Resource for ChildStdoutResource {
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fn name(&self) -> Cow<str> {
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"childStdout".into()
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}
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fn read_return(
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self: Rc<Self>,
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buf: ZeroCopyBuf,
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) -> AsyncResult<(usize, ZeroCopyBuf)> {
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Box::pin(self.read(buf))
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}
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fn close(self: Rc<Self>) {
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self.cancel_read_ops();
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}
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}
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pub type ChildStderrResource = ReadOnlyResource<process::ChildStderr>;
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impl Resource for ChildStderrResource {
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fn name(&self) -> Cow<str> {
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"childStderr".into()
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}
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fn read_return(
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self: Rc<Self>,
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buf: ZeroCopyBuf,
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) -> AsyncResult<(usize, ZeroCopyBuf)> {
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Box::pin(self.read(buf))
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}
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fn close(self: Rc<Self>) {
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self.cancel_read_ops();
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}
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}
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#[derive(Clone)]
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enum StdFileResourceInner {
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File(Arc<Mutex<StdFile>>),
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Stdin(Arc<Mutex<StdFile>>),
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// Ideally we would store stdio as an StdFile, but we get some Windows
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// specific functionality for free by using Rust std's wrappers. So we
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// take a bit of a complexity hit here in order to not have to duplicate
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// the functionality in Rust's std/src/sys/windows/stdio.rs
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Stdout,
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Stderr,
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}
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impl StdFileResourceInner {
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pub fn file(fs_file: StdFile) -> Self {
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StdFileResourceInner::File(Arc::new(Mutex::new(fs_file)))
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}
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pub fn with_file<R>(&self, mut f: impl FnMut(&mut StdFile) -> R) -> R {
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match self {
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Self::File(file) | Self::Stdin(file) => {
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let mut file = file.lock();
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f(&mut file)
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}
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Self::Stdout => f(&mut STDOUT_HANDLE.try_clone().unwrap()),
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Self::Stderr => f(&mut STDERR_HANDLE.try_clone().unwrap()),
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}
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}
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pub fn write_and_maybe_flush(
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&mut self,
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buf: &[u8],
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) -> Result<usize, AnyError> {
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let nwritten = self.write(buf)?;
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if !matches!(self, StdFileResourceInner::File(_)) {
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// Rust will line buffer and we don't want that behavior
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// (see https://github.com/denoland/deno/issues/948), so flush.
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// Although an alternative solution could be to bypass Rust's std by
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// using the raw fds/handles, it will cause encoding issues on Windows
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// that we get solved for free by using Rust's stdio wrappers (see
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// std/src/sys/windows/stdio.rs in Rust's source code).
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self.flush()?;
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}
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Ok(nwritten)
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}
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}
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impl Read for StdFileResourceInner {
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fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
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match self {
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Self::File(file) | Self::Stdin(file) => file.lock().read(buf),
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Self::Stdout => Err(ErrorKind::Unsupported.into()),
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Self::Stderr => Err(ErrorKind::Unsupported.into()),
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}
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}
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}
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impl Write for StdFileResourceInner {
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fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
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match self {
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Self::File(file) => file.lock().write(buf),
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Self::Stdin(_) => Err(ErrorKind::Unsupported.into()),
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Self::Stdout => std::io::stdout().write(buf),
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Self::Stderr => std::io::stderr().write(buf),
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}
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}
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fn flush(&mut self) -> std::io::Result<()> {
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match self {
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Self::File(file) => file.lock().flush(),
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Self::Stdin(_) => Err(ErrorKind::Unsupported.into()),
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Self::Stdout => std::io::stdout().flush(),
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Self::Stderr => std::io::stderr().flush(),
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}
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}
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}
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pub struct StdFileResource {
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inner: StdFileResourceInner,
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metadata: RefCell<FileMetadata>,
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name: String,
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}
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impl StdFileResource {
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fn stdio(inner: StdFileResourceInner, name: &str) -> Self {
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Self {
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inner,
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metadata: Default::default(),
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name: name.to_string(),
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}
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}
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pub fn fs_file(fs_file: StdFile) -> Self {
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Self {
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inner: StdFileResourceInner::file(fs_file),
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metadata: Default::default(),
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name: "fsFile".to_string(),
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}
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}
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pub fn std_file(&self) -> Arc<Mutex<StdFile>> {
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match &self.inner {
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StdFileResourceInner::File(fs_file)
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| StdFileResourceInner::Stdin(fs_file) => fs_file.clone(),
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StdFileResourceInner::Stdout => {
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Arc::new(Mutex::new(STDOUT_HANDLE.try_clone().unwrap()))
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}
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StdFileResourceInner::Stderr => {
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Arc::new(Mutex::new(STDERR_HANDLE.try_clone().unwrap()))
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}
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}
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}
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pub fn metadata_mut(&self) -> std::cell::RefMut<FileMetadata> {
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self.metadata.borrow_mut()
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}
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async fn read(
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self: Rc<Self>,
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mut buf: ZeroCopyBuf,
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) -> Result<(usize, ZeroCopyBuf), AnyError> {
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let mut inner = self.inner.clone();
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tokio::task::spawn_blocking(
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move || -> Result<(usize, ZeroCopyBuf), AnyError> {
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Ok((inner.read(&mut buf)?, buf))
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},
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)
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.await?
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}
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async fn write(self: Rc<Self>, buf: ZeroCopyBuf) -> Result<usize, AnyError> {
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let mut inner = self.inner.clone();
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tokio::task::spawn_blocking(move || inner.write_and_maybe_flush(&buf))
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.await?
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.map_err(AnyError::from)
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}
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fn with_inner<F, R>(
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state: &mut OpState,
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rid: ResourceId,
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mut f: F,
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) -> Result<R, AnyError>
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where
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F: FnMut(StdFileResourceInner) -> Result<R, AnyError>,
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{
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let resource = state.resource_table.get::<StdFileResource>(rid)?;
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f(resource.inner.clone())
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}
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pub fn with_file<F, R>(
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state: &mut OpState,
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rid: ResourceId,
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f: F,
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) -> Result<R, AnyError>
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where
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F: FnMut(&mut StdFile) -> Result<R, AnyError>,
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{
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let resource = state.resource_table.get::<StdFileResource>(rid)?;
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resource.inner.with_file(f)
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}
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pub fn clone_file(
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state: &mut OpState,
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rid: ResourceId,
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) -> Result<StdFile, AnyError> {
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Self::with_file(state, rid, move |std_file| {
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std_file.try_clone().map_err(AnyError::from)
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})
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}
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pub fn as_stdio(
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state: &mut OpState,
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rid: u32,
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) -> Result<std::process::Stdio, AnyError> {
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Self::with_inner(state, rid, |inner| match inner {
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StdFileResourceInner::File(file) => {
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let file = file.lock().try_clone()?;
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Ok(file.into())
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}
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_ => Ok(std::process::Stdio::inherit()),
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})
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}
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}
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impl Resource for StdFileResource {
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fn name(&self) -> Cow<str> {
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self.name.as_str().into()
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}
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fn read_return(
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self: Rc<Self>,
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buf: ZeroCopyBuf,
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) -> AsyncResult<(usize, ZeroCopyBuf)> {
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Box::pin(self.read(buf))
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}
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fn write(self: Rc<Self>, buf: ZeroCopyBuf) -> AsyncResult<usize> {
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Box::pin(self.write(buf))
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}
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}
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|
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// override op_print to use the stdout and stderr in the resource table
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#[op]
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pub fn op_print(
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state: &mut OpState,
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msg: String,
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is_err: bool,
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) -> Result<(), AnyError> {
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let rid = if is_err { 2 } else { 1 };
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StdFileResource::with_inner(state, rid, move |mut inner| {
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inner.write_all(msg.as_bytes())?;
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inner.flush().unwrap();
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Ok(())
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})
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}
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#[op]
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fn op_read_sync(
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state: &mut OpState,
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rid: ResourceId,
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mut buf: ZeroCopyBuf,
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) -> Result<u32, AnyError> {
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StdFileResource::with_inner(state, rid, move |mut inner| {
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inner
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.read(&mut buf)
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.map(|n: usize| n as u32)
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.map_err(AnyError::from)
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})
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}
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#[op]
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fn op_write_sync(
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state: &mut OpState,
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rid: ResourceId,
|
|
buf: ZeroCopyBuf,
|
|
) -> Result<u32, AnyError> {
|
|
StdFileResource::with_inner(state, rid, move |mut inner| {
|
|
inner
|
|
.write_and_maybe_flush(&buf)
|
|
.map(|nwritten: usize| nwritten as u32)
|
|
.map_err(AnyError::from)
|
|
})
|
|
}
|