mirror of
https://github.com/denoland/deno.git
synced 2024-10-30 09:08:00 -04:00
633 lines
16 KiB
Rust
633 lines
16 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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use deno_core::error::resource_unavailable;
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use deno_core::error::AnyError;
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use deno_core::op;
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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 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> = Lazy::new(|| {
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// SAFETY: corresponds to OS stdin
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unsafe { StdFile::from_raw_fd(0) }
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});
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#[cfg(unix)]
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static STDOUT_HANDLE: Lazy<StdFile> = Lazy::new(|| {
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// SAFETY: corresponds to OS stdout
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unsafe { StdFile::from_raw_fd(1) }
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});
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#[cfg(unix)]
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static STDERR_HANDLE: Lazy<StdFile> = Lazy::new(|| {
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// SAFETY: corresponds to OS stderr
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unsafe { StdFile::from_raw_fd(2) }
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});
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#[cfg(windows)]
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static STDIN_HANDLE: Lazy<StdFile> = Lazy::new(|| {
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// SAFETY: corresponds to OS stdin
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unsafe { 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(|| {
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// SAFETY: corresponds to OS stdout
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unsafe { 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(|| {
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// SAFETY: corresponds to OS stderr
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unsafe { 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 => {
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StdFileResourceInner::Stdin(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 => {
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StdFileResourceInner::Stdout(STDOUT_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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"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 => {
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StdFileResourceInner::Stderr(STDERR_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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"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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enum StdFileResourceInner {
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File(StdFile),
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Stdin(StdFile),
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// For stdout and stderr, we sometimes instead use std::io::stdout() directly,
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// because we get some Windows specific functionality for free by using Rust
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// std's wrappers. So we take a bit of a complexity hit in order to not
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// have to duplicate the functionality in Rust's std/src/sys/windows/stdio.rs
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Stdout(StdFile),
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Stderr(StdFile),
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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(fs_file)
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}
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pub fn with_file<R>(&mut self, f: impl FnOnce(&mut StdFile) -> R) -> R {
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match self {
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Self::File(file)
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| Self::Stdin(file)
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| Self::Stdout(file)
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| Self::Stderr(file) => f(file),
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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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// 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 stdout and stderr.
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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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match self {
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Self::File(file) => Ok(file.write(buf)?),
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Self::Stdin(_) => {
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Err(Into::<std::io::Error>::into(ErrorKind::Unsupported).into())
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}
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Self::Stdout(_) => {
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// bypass the file and use std::io::stdout()
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let mut stdout = std::io::stdout().lock();
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let nwritten = stdout.write(buf)?;
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stdout.flush()?;
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Ok(nwritten)
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}
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Self::Stderr(_) => {
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// bypass the file and use std::io::stderr()
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let mut stderr = std::io::stderr().lock();
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let nwritten = stderr.write(buf)?;
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stderr.flush()?;
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Ok(nwritten)
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}
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}
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}
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pub fn write_all_and_maybe_flush(
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&mut self,
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buf: &[u8],
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) -> Result<(), AnyError> {
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// this method exists instead of using a `Write` implementation
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// so that we can acquire the locks once and do both actions
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match self {
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Self::File(file) => Ok(file.write_all(buf)?),
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Self::Stdin(_) => {
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Err(Into::<std::io::Error>::into(ErrorKind::Unsupported).into())
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}
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Self::Stdout(_) => {
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// bypass the file and use std::io::stdout()
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let mut stdout = std::io::stdout().lock();
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stdout.write_all(buf)?;
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stdout.flush()?;
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Ok(())
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}
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Self::Stderr(_) => {
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// bypass the file and use std::io::stderr()
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let mut stderr = std::io::stderr().lock();
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stderr.write_all(buf)?;
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stderr.flush()?;
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Ok(())
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}
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}
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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.read(buf),
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Self::Stdout(_) | Self::Stderr(_) => Err(ErrorKind::Unsupported.into()),
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}
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}
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}
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pub struct StdFileResource {
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name: String,
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cell: AsyncRefCell<Option<(StdFileResourceInner, FileMetadata)>>,
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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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cell: AsyncRefCell::new(Some((inner, 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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cell: AsyncRefCell::new(Some((
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StdFileResourceInner::file(fs_file),
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Default::default(),
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))),
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name: "fsFile".to_string(),
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}
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}
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fn with_inner_and_metadata<TResult>(
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self: Rc<Self>,
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action: impl FnOnce(
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&mut StdFileResourceInner,
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&mut FileMetadata,
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) -> Result<TResult, AnyError>,
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) -> Result<TResult, AnyError> {
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match RcRef::map(&self, |r| &r.cell).try_borrow_mut() {
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Some(mut cell) => {
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let mut file = cell.take().unwrap();
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let result = action(&mut file.0, &mut file.1);
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cell.replace(file);
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result
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}
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None => Err(resource_unavailable()),
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}
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}
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async fn with_inner_blocking_task<F, R: Send + 'static>(
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self: Rc<Self>,
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action: F,
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) -> R
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where
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F: FnOnce(&mut StdFileResourceInner) -> R + Send + 'static,
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{
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// we take the value out of the cell, use it on a blocking task,
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// then put it back into the cell when we're done
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let mut cell = RcRef::map(&self, |r| &r.cell).borrow_mut().await;
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let mut file = cell.take().unwrap();
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let (file, result) = tokio::task::spawn_blocking(move || {
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let result = action(&mut file.0);
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(file, result)
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})
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.await
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.unwrap();
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cell.replace(file);
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result
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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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self
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.with_inner_blocking_task(
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move |inner| -> 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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self
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.with_inner_blocking_task(move |inner| inner.write_and_maybe_flush(&buf))
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.await
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}
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fn with_resource<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: FnOnce(Rc<StdFileResource>) -> 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)
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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: FnOnce(&mut StdFile) -> Result<R, AnyError>,
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{
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Self::with_resource(state, rid, move |resource| {
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resource.with_inner_and_metadata(move |inner, _| inner.with_file(f))
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})
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}
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pub fn with_file_and_metadata<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: FnOnce(&mut StdFile, &mut FileMetadata) -> Result<R, AnyError>,
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{
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Self::with_resource(state, rid, move |resource| {
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resource.with_inner_and_metadata(move |inner, metadata| {
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inner.with_file(move |file| f(file, metadata))
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})
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})
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}
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pub async fn with_file_blocking_task<F, R: Send + 'static>(
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state: Rc<RefCell<OpState>>,
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|
rid: ResourceId,
|
|
f: F,
|
|
) -> Result<R, AnyError>
|
|
where
|
|
F: (FnOnce(&mut StdFile) -> Result<R, AnyError>) + Send + 'static,
|
|
{
|
|
let resource = state
|
|
.borrow_mut()
|
|
.resource_table
|
|
.get::<StdFileResource>(rid)?;
|
|
|
|
resource
|
|
.with_inner_blocking_task(move |inner| inner.with_file(f))
|
|
.await
|
|
}
|
|
|
|
pub fn clone_file(
|
|
state: &mut OpState,
|
|
rid: ResourceId,
|
|
) -> Result<StdFile, AnyError> {
|
|
Self::with_file(state, rid, move |std_file| {
|
|
std_file.try_clone().map_err(AnyError::from)
|
|
})
|
|
}
|
|
|
|
pub fn as_stdio(
|
|
state: &mut OpState,
|
|
rid: u32,
|
|
) -> Result<std::process::Stdio, AnyError> {
|
|
Self::with_resource(state, rid, |resource| {
|
|
resource.with_inner_and_metadata(|inner, _| match inner {
|
|
StdFileResourceInner::File(file) => {
|
|
let file = file.try_clone()?;
|
|
Ok(file.into())
|
|
}
|
|
_ => Ok(std::process::Stdio::inherit()),
|
|
})
|
|
})
|
|
}
|
|
}
|
|
|
|
impl Resource for StdFileResource {
|
|
fn name(&self) -> Cow<str> {
|
|
self.name.as_str().into()
|
|
}
|
|
|
|
fn read_return(
|
|
self: Rc<Self>,
|
|
buf: ZeroCopyBuf,
|
|
) -> AsyncResult<(usize, ZeroCopyBuf)> {
|
|
Box::pin(self.read(buf))
|
|
}
|
|
|
|
fn write(self: Rc<Self>, buf: ZeroCopyBuf) -> AsyncResult<usize> {
|
|
Box::pin(self.write(buf))
|
|
}
|
|
}
|
|
|
|
// override op_print to use the stdout and stderr in the resource table
|
|
#[op]
|
|
pub fn op_print(
|
|
state: &mut OpState,
|
|
msg: String,
|
|
is_err: bool,
|
|
) -> Result<(), AnyError> {
|
|
let rid = if is_err { 2 } else { 1 };
|
|
StdFileResource::with_resource(state, rid, move |resource| {
|
|
resource.with_inner_and_metadata(|inner, _| {
|
|
inner.write_all_and_maybe_flush(msg.as_bytes())?;
|
|
Ok(())
|
|
})
|
|
})
|
|
}
|
|
|
|
#[op]
|
|
fn op_read_sync(
|
|
state: &mut OpState,
|
|
rid: ResourceId,
|
|
mut buf: ZeroCopyBuf,
|
|
) -> Result<u32, AnyError> {
|
|
StdFileResource::with_resource(state, rid, move |resource| {
|
|
resource.with_inner_and_metadata(|inner, _| {
|
|
inner
|
|
.read(&mut buf)
|
|
.map(|n: usize| n as u32)
|
|
.map_err(AnyError::from)
|
|
})
|
|
})
|
|
}
|
|
|
|
#[op]
|
|
fn op_write_sync(
|
|
state: &mut OpState,
|
|
rid: ResourceId,
|
|
buf: ZeroCopyBuf,
|
|
) -> Result<u32, AnyError> {
|
|
StdFileResource::with_resource(state, rid, move |resource| {
|
|
resource.with_inner_and_metadata(|inner, _| {
|
|
inner
|
|
.write_and_maybe_flush(&buf)
|
|
.map(|nwritten: usize| nwritten as u32)
|
|
.map_err(AnyError::from)
|
|
})
|
|
})
|
|
}
|