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feat(core): improve resource read & write traits (#16115)

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This commit introduces two new buffer wrapper types to `deno_core`. The
main benefit of these new wrappers is that they can wrap a number of
different underlying buffer types. This allows for a more flexible read
and write API on resources that will require less copying of data
between different buffer representations.

- `BufView` is a read-only view onto a buffer. It can be backed by
`ZeroCopyBuf`, `Vec<u8>`, and `bytes::Bytes`.
- `BufViewMut` is a read-write view onto a buffer. It can be cheaply
converted into a `BufView`. It can be backed by `ZeroCopyBuf` or
`Vec<u8>`.

Both new buffer views have a cursor. This means that the start point of
the view can be constrained to write / read from just a slice of the
view. Only the start point of the slice can be adjusted. The end point
is fixed. To adjust the end point, the underlying buffer needs to be
truncated.

Readable resources have been changed to better cater to resources that
do not support BYOB reads. The basic `read` method now returns a
`BufView` instead of taking a `ZeroCopyBuf` to fill. This allows the
operation to return buffers that the resource has already allocated,
instead of forcing the caller to allocate the buffer. BYOB reads are
still very useful for resources that support them, so a new `read_byob`
method has been added that takes a `BufViewMut` to fill. `op_read`
attempts to use `read_byob` if the resource supports it, which falls
back to `read` and performs an additional copy if it does not. For
Rust->JS reads this change should have no impact, but for Rust->Rust
reads, this allows the caller to avoid an additional copy in many
scenarios. This combined with the support for `BufView` to be backed by
`bytes::Bytes` allows us to avoid one data copy when piping from a
`fetch` response into an `ext/http` response.

Writable resources have been changed to take a `BufView` instead of a
`ZeroCopyBuf` as an argument. This allows for less copying of data in
certain scenarios, as described above. Additionally a new
`Resource::write_all` method has been added that takes a `BufView` and
continually attempts to write the resource until the entire buffer has
been written. Certain resources like files can override this method to
provide a more efficient `write_all` implementation.
This commit is contained in:
Luca Casonato 2022-10-09 16:49:25 +02:00 committed by GitHub
parent a622c5df27
commit 3b6b75bb46
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
15 changed files with 709 additions and 261 deletions
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1
Cargo.lock generated
View file

@ -967,6 +967,7 @@ name = "deno_core"
version = "0.154.0"
dependencies = [
"anyhow",
"bytes",
"deno_ast",
"deno_ops",
"futures",

4
cli/tests/unit/fetch_test.ts
View file

@ -869,13 +869,13 @@ Deno.test(
);
Deno.test(function responseRedirect() {
const redir = Response.redirect("example.com/newLocation", 301);
const redir = Response.redirect("http://example.com/newLocation", 301);
assertEquals(redir.status, 301);
assertEquals(redir.statusText, "");
assertEquals(redir.url, "");
assertEquals(
redir.headers.get("Location"),
"http://js-unit-tests/foo/example.com/newLocation",
"http://example.com/newLocation",
);
assertEquals(redir.type, "default");
});

1
core/Cargo.toml
View file

@ -18,6 +18,7 @@ v8_use_custom_libcxx = ["v8/use_custom_libcxx"]
[dependencies]
anyhow = "1.0.57"
bytes = "1"
deno_ops = { path = "../ops", version = "0.32.0" }
futures = "0.3.21"
# Stay on 1.6 to avoid a dependency cycle in ahash https://github.com/tkaitchuck/aHash/issues/95

31
core/examples/http_bench_json_ops.rs
View file

@ -10,7 +10,6 @@ use deno_core::OpState;
use deno_core::RcRef;
use deno_core::Resource;
use deno_core::ResourceId;
use deno_core::ZeroCopyBuf;
use std::cell::RefCell;
use std::env;
use std::net::SocketAddr;
@ -83,37 +82,23 @@ struct TcpStream {
}
impl TcpStream {
async fn read(
self: Rc<Self>,
mut buf: ZeroCopyBuf,
) -> Result<(usize, ZeroCopyBuf), Error> {
async fn read(self: Rc<Self>, data: &mut [u8]) -> Result<usize, Error> {
let mut rd = RcRef::map(&self, |r| &r.rd).borrow_mut().await;
let cancel = RcRef::map(self, |r| &r.cancel);
let nread = rd
.read(&mut buf)
.try_or_cancel(cancel)
.await
.map_err(Error::from)?;
Ok((nread, buf))
let nread = rd.read(data).try_or_cancel(cancel).await?;
Ok(nread)
}
async fn write(self: Rc<Self>, buf: ZeroCopyBuf) -> Result<usize, Error> {
async fn write(self: Rc<Self>, data: &[u8]) -> Result<usize, Error> {
let mut wr = RcRef::map(self, |r| &r.wr).borrow_mut().await;
wr.write(&buf).await.map_err(Error::from)
let nwritten = wr.write(data).await?;
Ok(nwritten)
}
}
impl Resource for TcpStream {
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))
}
deno_core::impl_readable_byob!();
deno_core::impl_writable!();
fn close(self: Rc<Self>) {
self.cancel.cancel()

271
core/io.rs Normal file
View file

@ -0,0 +1,271 @@
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use std::ops::Deref;
use std::ops::DerefMut;
use serde_v8::ZeroCopyBuf;
/// BufView is a wrapper around an underlying contiguous chunk of bytes. It can
/// be created from a [ZeroCopyBuf], [bytes::Bytes], or [Vec<u8>] and implements
/// `Deref<[u8]>` and `AsRef<[u8]>`.
///
/// The wrapper has the ability to constrain the exposed view to a sub-region of
/// the underlying buffer. This is useful for write operations, because they may
/// have to be called multiple times, with different views onto the buffer to be
/// able to write it entirely.
pub struct BufView {
inner: BufViewInner,
cursor: usize,
}
enum BufViewInner {
Empty,
Bytes(bytes::Bytes),
ZeroCopy(ZeroCopyBuf),
Vec(Vec<u8>),
}
impl BufView {
fn from_inner(inner: BufViewInner) -> Self {
Self { inner, cursor: 0 }
}
pub fn empty() -> Self {
Self::from_inner(BufViewInner::Empty)
}
/// Get the length of the buffer view. This is the length of the underlying
/// buffer minus the cursor position.
pub fn len(&self) -> usize {
match &self.inner {
BufViewInner::Empty => 0,
BufViewInner::Bytes(bytes) => bytes.len() - self.cursor,
BufViewInner::ZeroCopy(zero_copy) => zero_copy.len() - self.cursor,
BufViewInner::Vec(vec) => vec.len() - self.cursor,
}
}
/// Is the buffer view empty?
pub fn is_empty(&self) -> bool {
self.len() == 0
}
/// Advance the internal cursor of the buffer view by `n` bytes.
pub fn advance_cursor(&mut self, n: usize) {
assert!(self.len() >= n);
self.cursor += n;
}
/// Reset the internal cursor of the buffer view to the beginning of the
/// buffer. Returns the old cursor position.
pub fn reset_cursor(&mut self) -> usize {
let old = self.cursor;
self.cursor = 0;
old
}
}
impl Deref for BufView {
type Target = [u8];
fn deref(&self) -> &[u8] {
let buf = match &self.inner {
BufViewInner::Empty => &[],
BufViewInner::Bytes(bytes) => bytes.deref(),
BufViewInner::ZeroCopy(zero_copy) => zero_copy.deref(),
BufViewInner::Vec(vec) => vec.deref(),
};
&buf[self.cursor..]
}
}
impl AsRef<[u8]> for BufView {
fn as_ref(&self) -> &[u8] {
self.deref()
}
}
impl From<ZeroCopyBuf> for BufView {
fn from(buf: ZeroCopyBuf) -> Self {
Self::from_inner(BufViewInner::ZeroCopy(buf))
}
}
impl From<Vec<u8>> for BufView {
fn from(vec: Vec<u8>) -> Self {
Self::from_inner(BufViewInner::Vec(vec))
}
}
impl From<bytes::Bytes> for BufView {
fn from(buf: bytes::Bytes) -> Self {
Self::from_inner(BufViewInner::Bytes(buf))
}
}
impl From<BufView> for bytes::Bytes {
fn from(buf: BufView) -> Self {
match buf.inner {
BufViewInner::Empty => bytes::Bytes::new(),
BufViewInner::Bytes(bytes) => bytes,
BufViewInner::ZeroCopy(zero_copy) => zero_copy.into(),
BufViewInner::Vec(vec) => vec.into(),
}
}
}
/// BufMutView is a wrapper around an underlying contiguous chunk of writable
/// bytes. It can be created from a `ZeroCopyBuf` or a `Vec<u8>` and implements
/// `DerefMut<[u8]>` and `AsMut<[u8]>`.
///
/// The wrapper has the ability to constrain the exposed view to a sub-region of
/// the underlying buffer. This is useful for write operations, because they may
/// have to be called multiple times, with different views onto the buffer to be
/// able to write it entirely.
///
/// A `BufMutView` can be turned into a `BufView` by calling `BufMutView::into_view`.
pub struct BufMutView {
inner: BufMutViewInner,
cursor: usize,
}
enum BufMutViewInner {
ZeroCopy(ZeroCopyBuf),
Vec(Vec<u8>),
}
impl BufMutView {
fn from_inner(inner: BufMutViewInner) -> Self {
Self { inner, cursor: 0 }
}
pub fn new(len: usize) -> Self {
Self::from_inner(BufMutViewInner::Vec(vec![0; len]))
}
/// Get the length of the buffer view. This is the length of the underlying
/// buffer minus the cursor position.
pub fn len(&self) -> usize {
match &self.inner {
BufMutViewInner::ZeroCopy(zero_copy) => zero_copy.len() - self.cursor,
BufMutViewInner::Vec(vec) => vec.len() - self.cursor,
}
}
/// Is the buffer view empty?
pub fn is_empty(&self) -> bool {
self.len() == 0
}
/// Advance the internal cursor of the buffer view by `n` bytes.
pub fn advance_cursor(&mut self, n: usize) {
assert!(self.len() >= n);
self.cursor += n;
}
/// Reset the internal cursor of the buffer view to the beginning of the
/// buffer. Returns the old cursor position.
pub fn reset_cursor(&mut self) -> usize {
let old = self.cursor;
self.cursor = 0;
old
}
/// Turn this `BufMutView` into a `BufView`.
pub fn into_view(self) -> BufView {
let inner = match self.inner {
BufMutViewInner::ZeroCopy(zero_copy) => BufViewInner::ZeroCopy(zero_copy),
BufMutViewInner::Vec(vec) => BufViewInner::Vec(vec),
};
BufView {
inner,
cursor: self.cursor,
}
}
/// Unwrap the underlying buffer into a `Vec<u8>`, consuming the `BufMutView`.
///
/// This method panics when called on a `BufMutView` that was created from a
/// `ZeroCopyBuf`.
pub fn unwrap_vec(self) -> Vec<u8> {
match self.inner {
BufMutViewInner::ZeroCopy(_) => {
panic!("Cannot unwrap a ZeroCopyBuf backed BufMutView into a Vec");
}
BufMutViewInner::Vec(vec) => vec,
}
}
/// Get a mutable reference to an underlying `Vec<u8>`.
///
/// This method panics when called on a `BufMutView` that was created from a
/// `ZeroCopyBuf`.
pub fn get_mut_vec(&mut self) -> &mut Vec<u8> {
match &mut self.inner {
BufMutViewInner::ZeroCopy(_) => {
panic!("Cannot unwrap a ZeroCopyBuf backed BufMutView into a Vec");
}
BufMutViewInner::Vec(vec) => vec,
}
}
}
impl Deref for BufMutView {
type Target = [u8];
fn deref(&self) -> &[u8] {
let buf = match &self.inner {
BufMutViewInner::ZeroCopy(zero_copy) => zero_copy.deref(),
BufMutViewInner::Vec(vec) => vec.deref(),
};
&buf[self.cursor..]
}
}
impl DerefMut for BufMutView {
fn deref_mut(&mut self) -> &mut [u8] {
let buf = match &mut self.inner {
BufMutViewInner::ZeroCopy(zero_copy) => zero_copy.deref_mut(),
BufMutViewInner::Vec(vec) => vec.deref_mut(),
};
&mut buf[self.cursor..]
}
}
impl AsRef<[u8]> for BufMutView {
fn as_ref(&self) -> &[u8] {
self.deref()
}
}
impl AsMut<[u8]> for BufMutView {
fn as_mut(&mut self) -> &mut [u8] {
self.deref_mut()
}
}
impl From<ZeroCopyBuf> for BufMutView {
fn from(buf: ZeroCopyBuf) -> Self {
Self::from_inner(BufMutViewInner::ZeroCopy(buf))
}
}
impl From<Vec<u8>> for BufMutView {
fn from(buf: Vec<u8>) -> Self {
Self::from_inner(BufMutViewInner::Vec(buf))
}
}
pub enum WriteOutcome {
Partial { nwritten: usize, view: BufView },
Full { nwritten: usize },
}
impl WriteOutcome {
pub fn nwritten(&self) -> usize {
match self {
WriteOutcome::Partial { nwritten, .. } => *nwritten,
WriteOutcome::Full { nwritten } => *nwritten,
}
}
}

4
core/lib.rs
View file

@ -8,6 +8,7 @@ mod extensions;
mod flags;
mod gotham_state;
mod inspector;
mod io;
mod module_specifier;
mod modules;
mod normalize_path;
@ -58,6 +59,9 @@ pub use crate::inspector::InspectorMsgKind;
pub use crate::inspector::InspectorSessionProxy;
pub use crate::inspector::JsRuntimeInspector;
pub use crate::inspector::LocalInspectorSession;
pub use crate::io::BufMutView;
pub use crate::io::BufView;
pub use crate::io::WriteOutcome;
pub use crate::module_specifier::resolve_import;
pub use crate::module_specifier::resolve_path;
pub use crate::module_specifier::resolve_url;

74
core/ops_builtin.rs
View file

@ -2,6 +2,8 @@
use crate::error::format_file_name;
use crate::error::type_error;
use crate::include_js_files;
use crate::io::BufMutView;
use crate::io::BufView;
use crate::ops_metrics::OpMetrics;
use crate::resources::ResourceId;
use crate::Extension;
@ -166,7 +168,8 @@ async fn op_read(
buf: ZeroCopyBuf,
) -> Result<u32, Error> {
let resource = state.borrow().resource_table.get_any(rid)?;
resource.read_return(buf).await.map(|(n, _)| n as u32)
let view = BufMutView::from(buf);
resource.read_byob(view).await.map(|(n, _)| n as u32)
}
#[op]
@ -175,18 +178,67 @@ async fn op_read_all(
rid: ResourceId,
) -> Result<ZeroCopyBuf, Error> {
let resource = state.borrow().resource_table.get_any(rid)?;
let (min, maximum) = resource.size_hint();
let size = maximum.unwrap_or(min) as usize;
let mut buffer = Vec::with_capacity(size);
// The number of bytes we attempt to grow the buffer by each time it fills
// up and we have more data to read. We start at 64 KB. The grow_len is
// doubled if the nread returned from a single read is equal or greater than
// the grow_len. This allows us to reduce allocations for resources that can
// read large chunks of data at a time.
let mut grow_len: usize = 64 * 1024;
let (min, maybe_max) = resource.size_hint();
// Try to determine an optimial starting buffer size for this resource based
// on the size hint.
let initial_size = match (min, maybe_max) {
(min, Some(max)) if min == max => min as usize,
(_min, Some(max)) if (max as usize) < grow_len => max as usize,
(min, _) if (min as usize) < grow_len => grow_len,
(min, _) => min as usize,
};
let mut buf = BufMutView::new(initial_size);
loop {
let tmp = ZeroCopyBuf::new_temp(vec![0u8; 64 * 1024]);
let (nread, tmp) = resource.clone().read_return(tmp).await?;
if nread == 0 {
return Ok(buffer.into());
// if the buffer does not have much remaining space, we may have to grow it.
if buf.len() < grow_len {
let vec = buf.get_mut_vec();
match maybe_max {
Some(max) if vec.len() >= max as usize => {
// no need to resize the vec, because the vec is already large enough
// to accomodate the maximum size of the read data.
}
Some(max) if (max as usize) < vec.len() + grow_len => {
// grow the vec to the maximum size of the read data
vec.resize(max as usize, 0);
}
_ => {
// grow the vec by grow_len
vec.resize(vec.len() + grow_len, 0);
}
}
}
let (n, new_buf) = resource.clone().read_byob(buf).await?;
buf = new_buf;
buf.advance_cursor(n);
if n == 0 {
break;
}
if n >= grow_len {
// we managed to read more or equal data than fits in a single grow_len in
// a single go, so let's attempt to read even more next time. this reduces
// allocations for resources that can read large chunks of data at a time.
grow_len *= 2;
}
buffer.extend_from_slice(&tmp[..nread]);
}
let nread = buf.reset_cursor();
let mut vec = buf.unwrap_vec();
// If the buffer is larger than the amount of data read, shrink it to the
// amount of data read.
if nread < vec.len() {
vec.truncate(nread);
}
Ok(ZeroCopyBuf::from(vec))
}
#[op]
@ -196,7 +248,9 @@ async fn op_write(
buf: ZeroCopyBuf,
) -> Result<u32, Error> {
let resource = state.borrow().resource_table.get_any(rid)?;
resource.write(buf).await.map(|n| n as u32)
let view = BufView::from(buf);
let resp = resource.write(view).await?;
Ok(resp.nwritten() as u32)
}
#[op]

191
core/resources.rs
View file

@ -8,7 +8,9 @@
use crate::error::bad_resource_id;
use crate::error::not_supported;
use crate::ZeroCopyBuf;
use crate::io::BufMutView;
use crate::io::BufView;
use crate::io::WriteOutcome;
use anyhow::Error;
use futures::Future;
use std::any::type_name;
@ -23,9 +25,51 @@ use std::rc::Rc;
/// Returned by resource read/write/shutdown methods
pub type AsyncResult<T> = Pin<Box<dyn Future<Output = Result<T, Error>>>>;
/// All objects that can be store in the resource table should implement the
/// `Resource` trait.
/// TODO(@AaronO): investigate avoiding alloc on read/write/shutdown
/// Resources are Rust objects that are attached to a [deno_core::JsRuntime].
/// They are identified in JS by a numeric ID (the resource ID, or rid).
/// Resources can be created in ops. Resources can also be retrieved in ops by
/// their rid. Resources are not thread-safe - they can only be accessed from
/// the thread that the JsRuntime lives on.
///
/// Resources are reference counted in Rust. This means that they can be
/// cloned and passed around. When the last reference is dropped, the resource
/// is automatically closed. As long as the resource exists in the resource
/// table, the reference count is at least 1.
///
/// ### Readable
///
/// Readable resources are resources that can have data read from. Examples of
/// this are files, sockets, or HTTP streams.
///
/// Readables can be read from from either JS or Rust. In JS one can use
/// `Deno.core.read()` to read from a single chunk of data from a readable. In
/// Rust one can directly call `read()` or `read_byob()`. The Rust side code is
/// used to implement ops like `op_slice`.
///
/// A distinction can be made between readables that produce chunks of data
/// themselves (they allocate the chunks), and readables that fill up
/// bring-your-own-buffers (BYOBs). The former is often the case for framed
/// protocols like HTTP, while the latter is often the case for kernel backed
/// resources like files and sockets.
///
/// All readables must implement `read()`. If resources can support an optimized
/// path for BYOBs, they should also implement `read_byob()`. For kernel backed
/// resources it often makes sense to implement `read_byob()` first, and then
/// implement `read()` as an operation that allocates a new chunk with
/// `len == limit`, then calls `read_byob()`, and then returns a chunk sliced to
/// the number of bytes read. Kernel backed resources can use the
/// [deno_core::impl_readable_byob] macro to implement optimized `read_byob()`
/// and `read()` implementations from a single `Self::read()` method.
///
/// ### Writable
///
/// Writable resources are resources that can have data written to. Examples of
/// this are files, sockets, or HTTP streams.
///
/// Writables can be written to from either JS or Rust. In JS one can use
/// `Deno.core.write()` to write to a single chunk of data to a writable. In
/// Rust one can directly call `write()`. The latter is used to implement ops
/// like `op_slice`.
pub trait Resource: Any + 'static {
/// Returns a string representation of the resource which is made available
/// to JavaScript code through `op_resources`. The default implementation
@ -35,20 +79,86 @@ pub trait Resource: Any + 'static {
type_name::<Self>().into()
}
/// Resources may implement `read_return()` to be a readable stream
fn read_return(
/// Read a single chunk of data from the resource. This operation returns a
/// `BufView` that represents the data that was read. If a zero length buffer
/// is returned, it indicates that the resource has reached EOF.
///
/// If this method is not implemented, the default implementation will error
/// with a "not supported" error.
///
/// If a readable can provide an optimized path for BYOBs, it should also
/// implement `read_byob()`.
fn read(self: Rc<Self>, limit: usize) -> AsyncResult<BufView> {
_ = limit;
Box::pin(futures::future::err(not_supported()))
}
/// Read a single chunk of data from the resource into the provided `BufMutView`.
///
/// This operation returns the number of bytes read. If zero bytes are read,
/// it indicates that the resource has reached EOF.
///
/// If this method is not implemented explicitly, the default implementation
/// will call `read()` and then copy the data into the provided buffer. For
/// readable resources that can provide an optimized path for BYOBs, it is
/// strongly recommended to override this method.
fn read_byob(
self: Rc<Self>,
_buf: ZeroCopyBuf,
) -> AsyncResult<(usize, ZeroCopyBuf)> {
mut buf: BufMutView,
) -> AsyncResult<(usize, BufMutView)> {
Box::pin(async move {
let read = self.read(buf.len()).await?;
let nread = read.len();
buf[..nread].copy_from_slice(&read);
Ok((nread, buf))
})
}
/// Write a single chunk of data to the resource. The operation may not be
/// able to write the entire chunk, in which case it should return the number
/// of bytes written. Additionally it should return the `BufView` that was
/// passed in.
///
/// If this method is not implemented, the default implementation will error
/// with a "not supported" error.
fn write(self: Rc<Self>, buf: BufView) -> AsyncResult<WriteOutcome> {
_ = buf;
Box::pin(futures::future::err(not_supported()))
}
/// Resources may implement `write()` to be a writable stream
fn write(self: Rc<Self>, _buf: ZeroCopyBuf) -> AsyncResult<usize> {
Box::pin(futures::future::err(not_supported()))
/// Write an entire chunk of data to the resource. Unlike `write()`, this will
/// ensure the entire chunk is written. If the operation is not able to write
/// the entire chunk, an error is to be returned.
///
/// By default this method will call `write()` repeatedly until the entire
/// chunk is written. Resources that can write the entire chunk in a single
/// operation using an optimized path should override this method.
fn write_all(self: Rc<Self>, view: BufView) -> AsyncResult<()> {
Box::pin(async move {
let mut view = view;
let this = self;
while !view.is_empty() {
let resp = this.clone().write(view).await?;
match resp {
WriteOutcome::Partial {
nwritten,
view: new_view,
} => {
view = new_view;
view.advance_cursor(nwritten);
}
WriteOutcome::Full { .. } => break,
}
}
Ok(())
})
}
/// Resources may implement `shutdown()` for graceful async shutdowns
/// The shutdown method can be used to asynchronously close the resource. It
/// is not automatically called when the resource is dropped or closed.
///
/// If this method is not implemented, the default implementation will error
/// with a "not supported" error.
fn shutdown(self: Rc<Self>) -> AsyncResult<()> {
Box::pin(futures::future::err(not_supported()))
}
@ -229,3 +339,60 @@ impl ResourceTable {
.map(|(&id, resource)| (id, resource.name()))
}
}
#[macro_export]
macro_rules! impl_readable_byob {
() => {
fn read(self: Rc<Self>, limit: usize) -> AsyncResult<$crate::BufView> {
Box::pin(async move {
let mut vec = vec![0; limit];
let nread = self.read(&mut vec).await?;
if nread != vec.len() {
vec.truncate(nread);
}
let view = $crate::BufView::from(vec);
Ok(view)
})
}
fn read_byob(
self: Rc<Self>,
mut buf: $crate::BufMutView,
) -> AsyncResult<(usize, $crate::BufMutView)> {
Box::pin(async move {
let nread = self.read(buf.as_mut()).await?;
Ok((nread, buf))
})
}
};
}
#[macro_export]
macro_rules! impl_writable {
(__write) => {
fn write(
self: Rc<Self>,
view: $crate::BufView,
) -> AsyncResult<$crate::WriteOutcome> {
Box::pin(async move {
let nwritten = self.write(&view).await?;
Ok($crate::WriteOutcome::Partial { nwritten, view })
})
}
};
(__write_all) => {
fn write_all(self: Rc<Self>, view: $crate::BufView) -> AsyncResult<()> {
Box::pin(async move {
self.write_all(&view).await?;
Ok(())
})
}
};
() => {
$crate::impl_writable!(__write);
};
(with_all) => {
$crate::impl_writable!(__write);
$crate::impl_writable!(__write_all);
};
}

27
ext/cache/sqlite.rs vendored
View file

@ -7,7 +7,6 @@ use deno_core::AsyncRefCell;
use deno_core::AsyncResult;
use deno_core::ByteString;
use deno_core::Resource;
use deno_core::ZeroCopyBuf;
use rusqlite::params;
use rusqlite::Connection;
use rusqlite::OptionalExtension;
@ -347,10 +346,10 @@ pub struct CachePutResource {
}
impl CachePutResource {
async fn write(self: Rc<Self>, data: ZeroCopyBuf) -> Result<usize, AnyError> {
async fn write(self: Rc<Self>, data: &[u8]) -> Result<usize, AnyError> {
let resource = deno_core::RcRef::map(&self, |r| &r.file);
let mut file = resource.borrow_mut().await;
file.write_all(&data).await?;
file.write_all(data).await?;
Ok(data.len())
}
@ -374,9 +373,7 @@ impl Resource for CachePutResource {
"CachePutResource".into()
}
fn write(self: Rc<Self>, buf: ZeroCopyBuf) -> AsyncResult<usize> {
Box::pin(self.write(buf))
}
deno_core::impl_writable!();
fn shutdown(self: Rc<Self>) -> AsyncResult<()> {
Box::pin(self.shutdown())
@ -394,28 +391,20 @@ impl CacheResponseResource {
}
}
async fn read(
self: Rc<Self>,
mut buf: ZeroCopyBuf,
) -> Result<(usize, ZeroCopyBuf), AnyError> {
async fn read(self: Rc<Self>, data: &mut [u8]) -> Result<usize, AnyError> {
let resource = deno_core::RcRef::map(&self, |r| &r.file);
let mut file = resource.borrow_mut().await;
let nread = file.read(&mut buf).await?;
Ok((nread, buf))
let nread = file.read(data).await?;
Ok(nread)
}
}
impl Resource for CacheResponseResource {
deno_core::impl_readable_byob!();
fn name(&self) -> Cow<str> {
"CacheResponseResource".into()
}
fn read_return(
self: Rc<Self>,
buf: ZeroCopyBuf,
) -> AsyncResult<(usize, ZeroCopyBuf)> {
Box::pin(self.read(buf))
}
}
pub fn hash(token: &str) -> String {

63
ext/fetch/lib.rs
View file

@ -5,11 +5,14 @@ mod fs_fetch_handler;
use data_url::DataUrl;
use deno_core::error::type_error;
use deno_core::error::AnyError;
use deno_core::futures::stream::Peekable;
use deno_core::futures::Future;
use deno_core::futures::Stream;
use deno_core::futures::StreamExt;
use deno_core::include_js_files;
use deno_core::op;
use deno_core::BufView;
use deno_core::WriteOutcome;
use deno_core::url::Url;
use deno_core::AsyncRefCell;
@ -43,15 +46,14 @@ use serde::Deserialize;
use serde::Serialize;
use std::borrow::Cow;
use std::cell::RefCell;
use std::cmp::min;
use std::convert::From;
use std::path::Path;
use std::path::PathBuf;
use std::pin::Pin;
use std::rc::Rc;
use tokio::io::AsyncReadExt;
use tokio::sync::mpsc;
use tokio_stream::wrappers::ReceiverStream;
use tokio_util::io::StreamReader;
// Re-export reqwest and data_url
pub use data_url;
@ -252,7 +254,7 @@ where
match data {
None => {
// If no body is passed, we return a writer for streaming the body.
let (tx, rx) = mpsc::channel::<std::io::Result<Vec<u8>>>(1);
let (tx, rx) = mpsc::channel::<std::io::Result<bytes::Bytes>>(1);
// If the size of the body is known, we include a content-length
// header explicitly.
@ -401,12 +403,11 @@ pub async fn op_fetch_send(
let stream: BytesStream = Box::pin(res.bytes_stream().map(|r| {
r.map_err(|err| std::io::Error::new(std::io::ErrorKind::Other, err))
}));
let stream_reader = StreamReader::new(stream);
let rid = state
.borrow_mut()
.resource_table
.add(FetchResponseBodyResource {
reader: AsyncRefCell::new(stream_reader),
reader: AsyncRefCell::new(stream.peekable()),
cancel: CancelHandle::default(),
size: content_length,
});
@ -446,7 +447,7 @@ impl Resource for FetchCancelHandle {
}
pub struct FetchRequestBodyResource {
body: AsyncRefCell<mpsc::Sender<std::io::Result<Vec<u8>>>>,
body: AsyncRefCell<mpsc::Sender<std::io::Result<bytes::Bytes>>>,
cancel: CancelHandle,
}
@ -455,17 +456,16 @@ impl Resource for FetchRequestBodyResource {
"fetchRequestBody".into()
}
fn write(self: Rc<Self>, buf: ZeroCopyBuf) -> AsyncResult<usize> {
fn write(self: Rc<Self>, buf: BufView) -> AsyncResult<WriteOutcome> {
Box::pin(async move {
let data = buf.to_vec();
let len = data.len();
let bytes: bytes::Bytes = buf.into();
let nwritten = bytes.len();
let body = RcRef::map(&self, |r| &r.body).borrow_mut().await;
let cancel = RcRef::map(self, |r| &r.cancel);
body.send(Ok(data)).or_cancel(cancel).await?.map_err(|_| {
body.send(Ok(bytes)).or_cancel(cancel).await?.map_err(|_| {
type_error("request body receiver not connected (request closed)")
})?;
Ok(len)
Ok(WriteOutcome::Full { nwritten })
})
}
@ -478,7 +478,7 @@ type BytesStream =
Pin<Box<dyn Stream<Item = Result<bytes::Bytes, std::io::Error>> + Unpin>>;
struct FetchResponseBodyResource {
reader: AsyncRefCell<StreamReader<BytesStream, bytes::Bytes>>,
reader: AsyncRefCell<Peekable<BytesStream>>,
cancel: CancelHandle,
size: Option<u64>,
}
@ -488,15 +488,36 @@ impl Resource for FetchResponseBodyResource {
"fetchResponseBody".into()
}
fn read_return(
self: Rc<Self>,
mut buf: ZeroCopyBuf,
) -> AsyncResult<(usize, ZeroCopyBuf)> {
fn read(self: Rc<Self>, limit: usize) -> AsyncResult<BufView> {
Box::pin(async move {
let mut reader = RcRef::map(&self, |r| &r.reader).borrow_mut().await;
let cancel = RcRef::map(self, |r| &r.cancel);
let read = reader.read(&mut buf).try_or_cancel(cancel).await?;
Ok((read, buf))
let reader = RcRef::map(&self, |r| &r.reader).borrow_mut().await;
let fut = async move {
let mut reader = Pin::new(reader);
loop {
match reader.as_mut().peek_mut().await {
Some(Ok(chunk)) if !chunk.is_empty() => {
let len = min(limit, chunk.len());
let chunk = chunk.split_to(len);
break Ok(chunk.into());
}
// This unwrap is safe because `peek_mut()` returned `Some`, and thus
// currently has a peeked value that can be synchronously returned
// from `next()`.
//
// The future returned from `next()` is always ready, so we can
// safely call `await` on it without creating a race condition.
Some(_) => match reader.as_mut().next().await.unwrap() {
Ok(chunk) => assert!(chunk.is_empty()),
Err(err) => break Err(AnyError::from(err)),
},
None => break Ok(BufView::empty()),
}
}
};
let cancel_handle = RcRef::map(self, |r| &r.cancel);
fut.try_or_cancel(cancel_handle).await
})
}

12
ext/flash/lib.rs
View file

@ -253,20 +253,16 @@ async fn op_flash_write_resource(
.write_all(b"Transfer-Encoding: chunked\r\n\r\n")
.await?;
loop {
let vec = vec![0u8; 64 * 1024]; // 64KB
let buf = ZeroCopyBuf::new_temp(vec);
let (nread, buf) = resource.clone().read_return(buf).await?;
if nread == 0 {
let view = resource.clone().read(64 * 1024).await?; // 64KB
if view.is_empty() {
stream.write_all(b"0\r\n\r\n").await?;
break;
}
let response = &buf[..nread];
// TODO(@littledivy): use vectored writes.
stream
.write_all(format!("{:x}\r\n", response.len()).as_bytes())
.write_all(format!("{:x}\r\n", view.len()).as_bytes())
.await?;
stream.write_all(response).await?;
stream.write_all(&view).await?;
stream.write_all(b"\r\n").await?;
}
resource.close();

112
ext/http/lib.rs
View file

@ -23,6 +23,8 @@ use deno_core::futures::TryFutureExt;
use deno_core::include_js_files;
use deno_core::op;
use deno_core::AsyncRefCell;
use deno_core::AsyncResult;
use deno_core::BufView;
use deno_core::ByteString;
use deno_core::CancelFuture;
use deno_core::CancelHandle;
@ -333,61 +335,58 @@ impl HttpStreamResource {
}
}
impl HttpStreamResource {
async fn read(
self: Rc<Self>,
mut buf: ZeroCopyBuf,
) -> Result<(usize, ZeroCopyBuf), AnyError> {
let mut rd = RcRef::map(&self, |r| &r.rd).borrow_mut().await;
let body = loop {
match &mut *rd {
HttpRequestReader::Headers(_) => {}
HttpRequestReader::Body(_, body) => break body,
HttpRequestReader::Closed => return Ok((0, buf)),
}
match take(&mut *rd) {
HttpRequestReader::Headers(request) => {
let (parts, body) = request.into_parts();
*rd = HttpRequestReader::Body(parts.headers, body.peekable());
}
_ => unreachable!(),
};
};
let fut = async {
let mut body = Pin::new(body);
loop {
match body.as_mut().peek_mut().await {
Some(Ok(chunk)) if !chunk.is_empty() => {
let len = min(buf.len(), chunk.len());
buf[..len].copy_from_slice(&chunk.split_to(len));
break Ok((len, buf));
}
Some(_) => match body.as_mut().next().await.unwrap() {
Ok(chunk) => assert!(chunk.is_empty()),
Err(err) => break Err(AnyError::from(err)),
},
None => break Ok((0, buf)),
}
}
};
let cancel_handle = RcRef::map(&self, |r| &r.cancel_handle);
fut.try_or_cancel(cancel_handle).await
}
}
impl Resource for HttpStreamResource {
fn name(&self) -> Cow<str> {
"httpStream".into()
}
fn read_return(
self: Rc<Self>,
_buf: ZeroCopyBuf,
) -> deno_core::AsyncResult<(usize, ZeroCopyBuf)> {
Box::pin(self.read(_buf))
fn read(self: Rc<Self>, limit: usize) -> AsyncResult<BufView> {
Box::pin(async move {
let mut rd = RcRef::map(&self, |r| &r.rd).borrow_mut().await;
let body = loop {
match &mut *rd {
HttpRequestReader::Headers(_) => {}
HttpRequestReader::Body(_, body) => break body,
HttpRequestReader::Closed => return Ok(BufView::empty()),
}
match take(&mut *rd) {
HttpRequestReader::Headers(request) => {
let (parts, body) = request.into_parts();
*rd = HttpRequestReader::Body(parts.headers, body.peekable());
}
_ => unreachable!(),
};
};
let fut = async {
let mut body = Pin::new(body);
loop {
match body.as_mut().peek_mut().await {
Some(Ok(chunk)) if !chunk.is_empty() => {
let len = min(limit, chunk.len());
let buf = chunk.split_to(len);
let view = BufView::from(buf);
break Ok(view);
}
// This unwrap is safe because `peek_mut()` returned `Some`, and thus
// currently has a peeked value that can be synchronously returned
// from `next()`.
//
// The future returned from `next()` is always ready, so we can
// safely call `await` on it without creating a race condition.
Some(_) => match body.as_mut().next().await.unwrap() {
Ok(chunk) => assert!(chunk.is_empty()),
Err(err) => break Err(AnyError::from(err)),
},
None => break Ok(BufView::empty()),
}
}
};
let cancel_handle = RcRef::map(&self, |r| &r.cancel_handle);
fut.try_or_cancel(cancel_handle).await
})
}
fn close(self: Rc<Self>) {
@ -763,16 +762,14 @@ async fn op_http_write_resource(
_ => {}
};
let vec = vec![0u8; 64 * 1024]; // 64KB
let buf = ZeroCopyBuf::new_temp(vec);
let (nread, buf) = resource.clone().read_return(buf).await?;
if nread == 0 {
let view = resource.clone().read(64 * 1024).await?; // 64KB
if view.is_empty() {
break;
}
match &mut *wr {
HttpResponseWriter::Body(body) => {
if let Err(err) = body.write_all(&buf[..nread]).await {
if let Err(err) = body.write_all(&view).await {
assert_eq!(err.kind(), std::io::ErrorKind::BrokenPipe);
// Don't return "broken pipe", that's an implementation detail.
// Pull up the failure associated with the transport connection instead.
@ -782,9 +779,8 @@ async fn op_http_write_resource(
}
}
HttpResponseWriter::BodyUncompressed(body) => {
let mut buf = buf.to_temp();
buf.truncate(nread);
if let Err(err) = body.send_data(Bytes::from(buf)).await {
let bytes = Bytes::from(view);
if let Err(err) = body.send_data(bytes).await {
assert!(err.is_closed());
// Pull up the failure associated with the transport connection instead.
http_stream.conn.closed().await?;

57
ext/net/io.rs
View file

@ -9,7 +9,6 @@ use deno_core::CancelHandle;
use deno_core::CancelTryFuture;
use deno_core::RcRef;
use deno_core::Resource;
use deno_core::ZeroCopyBuf;
use socket2::SockRef;
use std::borrow::Cow;
use std::rc::Rc;
@ -69,22 +68,16 @@ where
pub async fn read(
self: Rc<Self>,
mut buf: ZeroCopyBuf,
) -> Result<(usize, ZeroCopyBuf), AnyError> {
data: &mut [u8],
) -> Result<usize, AnyError> {
let mut rd = self.rd_borrow_mut().await;
let nread = rd
.read(&mut buf)
.try_or_cancel(self.cancel_handle())
.await?;
Ok((nread, buf))
let nread = rd.read(data).try_or_cancel(self.cancel_handle()).await?;
Ok(nread)
}
pub async fn write(
self: Rc<Self>,
buf: ZeroCopyBuf,
) -> Result<usize, AnyError> {
pub async fn write(self: Rc<Self>, data: &[u8]) -> Result<usize, AnyError> {
let mut wr = self.wr_borrow_mut().await;
let nwritten = wr.write(&buf).await?;
let nwritten = wr.write(data).await?;
Ok(nwritten)
}
@ -99,21 +92,13 @@ pub type TcpStreamResource =
FullDuplexResource<tcp::OwnedReadHalf, tcp::OwnedWriteHalf>;
impl Resource for TcpStreamResource {
deno_core::impl_readable_byob!();
deno_core::impl_writable!();
fn name(&self) -> Cow<str> {
"tcpStream".into()
}
fn 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))
}
fn shutdown(self: Rc<Self>) -> AsyncResult<()> {
Box::pin(self.shutdown())
}
@ -161,16 +146,10 @@ pub struct UnixStreamResource;
#[cfg(not(unix))]
impl UnixStreamResource {
pub async fn read(
self: Rc<Self>,
_buf: ZeroCopyBuf,
) -> Result<(usize, ZeroCopyBuf), AnyError> {
fn read(self: Rc<Self>, data: &mut [u8]) -> AsyncResult<usize> {
unreachable!()
}
pub async fn write(
self: Rc<Self>,
_buf: ZeroCopyBuf,
) -> Result<usize, AnyError> {
fn write(self: Rc<Self>, data: &[u8]) -> AsyncResult<usize> {
unreachable!()
}
pub async fn shutdown(self: Rc<Self>) -> Result<(), AnyError> {
@ -182,21 +161,13 @@ impl UnixStreamResource {
}
impl Resource for UnixStreamResource {
deno_core::impl_readable_byob!();
deno_core::impl_writable!();
fn name(&self) -> Cow<str> {
"unixStream".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))
}
fn shutdown(self: Rc<Self>) -> AsyncResult<()> {
Box::pin(self.shutdown())
}

30
ext/net/ops_tls.rs
View file

@ -38,7 +38,6 @@ use deno_core::OpState;
use deno_core::RcRef;
use deno_core::Resource;
use deno_core::ResourceId;
use deno_core::ZeroCopyBuf;
use deno_tls::create_client_config;
use deno_tls::load_certs;
use deno_tls::load_private_keys;
@ -691,21 +690,18 @@ impl TlsStreamResource {
pub async fn read(
self: Rc<Self>,
mut buf: ZeroCopyBuf,
) -> Result<(usize, ZeroCopyBuf), AnyError> {
data: &mut [u8],
) -> Result<usize, AnyError> {
let mut rd = RcRef::map(&self, |r| &r.rd).borrow_mut().await;
let cancel_handle = RcRef::map(&self, |r| &r.cancel_handle);
let nread = rd.read(&mut buf).try_or_cancel(cancel_handle).await?;
Ok((nread, buf))
let nread = rd.read(data).try_or_cancel(cancel_handle).await?;
Ok(nread)
}
pub async fn write(
self: Rc<Self>,
buf: ZeroCopyBuf,
) -> Result<usize, AnyError> {
pub async fn write(self: Rc<Self>, data: &[u8]) -> Result<usize, AnyError> {
self.handshake().await?;
let mut wr = RcRef::map(self, |r| &r.wr).borrow_mut().await;
let nwritten = wr.write(&buf).await?;
let nwritten = wr.write(data).await?;
wr.flush().await?;
Ok(nwritten)
}
@ -736,21 +732,13 @@ impl TlsStreamResource {
}
impl Resource for TlsStreamResource {
deno_core::impl_readable_byob!();
deno_core::impl_writable!();
fn name(&self) -> Cow<str> {
"tlsStream".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))
}
fn shutdown(self: Rc<Self>) -> AsyncResult<()> {
Box::pin(self.shutdown())
}

92
runtime/ops/io.rs
View file

@ -7,6 +7,8 @@ use deno_core::parking_lot::Mutex;
use deno_core::AsyncMutFuture;
use deno_core::AsyncRefCell;
use deno_core::AsyncResult;
use deno_core::BufMutView;
use deno_core::BufView;
use deno_core::CancelHandle;
use deno_core::CancelTryFuture;
use deno_core::Extension;
@ -202,9 +204,9 @@ where
RcRef::map(self, |r| &r.stream).borrow_mut()
}
async fn write(self: Rc<Self>, buf: ZeroCopyBuf) -> Result<usize, AnyError> {
async fn write(self: Rc<Self>, data: &[u8]) -> Result<usize, AnyError> {
let mut stream = self.borrow_mut().await;
let nwritten = stream.write(&buf).await?;
let nwritten = stream.write(data).await?;
Ok(nwritten)
}
@ -250,16 +252,10 @@ where
self.cancel_handle.cancel()
}
async fn read(
self: Rc<Self>,
mut buf: ZeroCopyBuf,
) -> Result<(usize, ZeroCopyBuf), AnyError> {
async fn read(self: Rc<Self>, data: &mut [u8]) -> Result<usize, AnyError> {
let mut rd = self.borrow_mut().await;
let nread = rd
.read(&mut buf)
.try_or_cancel(self.cancel_handle())
.await?;
Ok((nread, buf))
let nread = rd.read(data).try_or_cancel(self.cancel_handle()).await?;
Ok(nread)
}
pub fn into_inner(self) -> S {
@ -274,9 +270,7 @@ impl Resource for ChildStdinResource {
"childStdin".into()
}
fn write(self: Rc<Self>, buf: ZeroCopyBuf) -> AsyncResult<usize> {
Box::pin(self.write(buf))
}
deno_core::impl_writable!();
fn shutdown(self: Rc<Self>) -> AsyncResult<()> {
Box::pin(self.shutdown())
@ -286,17 +280,12 @@ impl Resource for ChildStdinResource {
pub type ChildStdoutResource = ReadOnlyResource<process::ChildStdout>;
impl Resource for ChildStdoutResource {
deno_core::impl_readable_byob!();
fn name(&self) -> Cow<str> {
"childStdout".into()
}
fn read_return(
self: Rc<Self>,
buf: ZeroCopyBuf,
) -> AsyncResult<(usize, ZeroCopyBuf)> {
Box::pin(self.read(buf))
}
fn close(self: Rc<Self>) {
self.cancel_read_ops();
}
@ -305,17 +294,12 @@ impl Resource for ChildStdoutResource {
pub type ChildStderrResource = ReadOnlyResource<process::ChildStderr>;
impl Resource for ChildStderrResource {
deno_core::impl_readable_byob!();
fn name(&self) -> Cow<str> {
"childStderr".into()
}
fn read_return(
self: Rc<Self>,
buf: ZeroCopyBuf,
) -> AsyncResult<(usize, ZeroCopyBuf)> {
Box::pin(self.read(buf))
}
fn close(self: Rc<Self>) {
self.cancel_read_ops();
}
@ -534,25 +518,34 @@ impl StdFileResource {
result
}
async fn read(
async fn read_byob(
self: Rc<Self>,
mut buf: ZeroCopyBuf,
) -> Result<(usize, ZeroCopyBuf), AnyError> {
mut buf: BufMutView,
) -> Result<(usize, BufMutView), AnyError> {
self
.with_inner_blocking_task(
move |inner| -> Result<(usize, ZeroCopyBuf), AnyError> {
Ok((inner.read(&mut buf)?, buf))
},
)
.with_inner_blocking_task(move |inner| {
let nread = inner.read(&mut buf)?;
Ok((nread, buf))
})
.await
}
async fn write(self: Rc<Self>, buf: ZeroCopyBuf) -> Result<usize, AnyError> {
async fn write(self: Rc<Self>, data: &[u8]) -> Result<usize, AnyError> {
let buf = data.to_owned();
self
.with_inner_blocking_task(move |inner| inner.write_and_maybe_flush(&buf))
.await
}
async fn write_all(self: Rc<Self>, data: &[u8]) -> Result<(), AnyError> {
let buf = data.to_owned();
self
.with_inner_blocking_task(move |inner| {
inner.write_all_and_maybe_flush(&buf)
})
.await
}
fn with_resource<F, R>(
state: &mut OpState,
rid: ResourceId,
@ -641,17 +634,28 @@ impl Resource for StdFileResource {
self.name.as_str().into()
}
fn read_return(
self: Rc<Self>,
buf: ZeroCopyBuf,
) -> AsyncResult<(usize, ZeroCopyBuf)> {
Box::pin(self.read(buf))
fn read(self: Rc<Self>, limit: usize) -> AsyncResult<deno_core::BufView> {
Box::pin(async move {
let vec = vec![0; limit];
let buf = BufMutView::from(vec);
let (nread, buf) = self.read_byob(buf).await?;
let mut vec = buf.unwrap_vec();
if vec.len() != nread {
vec.truncate(nread);
}
Ok(BufView::from(vec))
})
}
fn write(self: Rc<Self>, buf: ZeroCopyBuf) -> AsyncResult<usize> {
Box::pin(self.write(buf))
fn read_byob(
self: Rc<Self>,
buf: deno_core::BufMutView,
) -> AsyncResult<(usize, deno_core::BufMutView)> {
Box::pin(self.read_byob(buf))
}
deno_core::impl_writable!(with_all);
#[cfg(unix)]
fn backing_fd(self: Rc<Self>) -> Option<std::os::unix::prelude::RawFd> {
use std::os::unix::io::AsRawFd;