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https://github.com/tokio-rs/tokio.git
synced 2026-09-08 00:00:13 +02:00
Import tokio-uds (#365)
This imports tokio-uds from the dedicated repo.
This commit is contained in:
Carl Lerche
@@ -0,0 +1,356 @@
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use ucred::{self, UCred};
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use tokio_io::{AsyncRead, AsyncWrite};
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use tokio_reactor::{Handle, PollEvented};
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use bytes::{Buf, BufMut};
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use futures::{Async, Future, Poll};
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use iovec::{self, IoVec};
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use libc;
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use mio::Ready;
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use mio_uds;
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use std::fmt;
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use std::io::{self, Read, Write};
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use std::net::Shutdown;
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use std::os::unix::io::{AsRawFd, RawFd};
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use std::os::unix::net::{self, SocketAddr};
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use std::path::Path;
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/// A structure representing a connected unix socket.
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///
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/// This socket can be connected directly with `UnixStream::connect` or accepted
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/// from a listener with `UnixListener::incoming`. Additionally, a pair of
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/// anonymous Unix sockets can be created with `UnixStream::pair`.
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pub struct UnixStream {
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io: PollEvented<mio_uds::UnixStream>,
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}
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/// Future returned by `UnixStream::connect` which will resolve to a
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/// `UnixStream` when the stream is connected.
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#[derive(Debug)]
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pub struct ConnectFuture {
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inner: State,
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}
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#[derive(Debug)]
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enum State {
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Waiting(UnixStream),
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Error(io::Error),
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Empty,
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}
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impl UnixStream {
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/// Connects to the socket named by `path`.
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///
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/// This function will create a new unix socket and connect to the path
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/// specified, associating the returned stream with the default event loop's
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/// handle.
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pub fn connect<P>(path: P) -> ConnectFuture
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where
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P: AsRef<Path>,
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{
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let res = mio_uds::UnixStream::connect(path)
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.map(UnixStream::new);
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let inner = match res {
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Ok(stream) => State::Waiting(stream),
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Err(e) => State::Error(e),
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};
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ConnectFuture { inner }
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}
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/// Consumes a `UnixStream` in the standard library and returns a
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/// nonblocking `UnixStream` from this crate.
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///
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/// The returned stream will be associated with the given event loop
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/// specified by `handle` and is ready to perform I/O.
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pub fn from_std(stream: net::UnixStream, handle: &Handle) -> io::Result<UnixStream> {
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let stream = mio_uds::UnixStream::from_stream(stream)?;
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let io = PollEvented::new_with_handle(stream, handle)?;
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Ok(UnixStream { io })
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}
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/// Creates an unnamed pair of connected sockets.
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///
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/// This function will create a pair of interconnected unix sockets for
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/// communicating back and forth between one another. Each socket will be
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/// associated with the event loop whose handle is also provided.
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pub fn pair() -> io::Result<(UnixStream, UnixStream)> {
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let (a, b) = try!(mio_uds::UnixStream::pair());
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let a = UnixStream::new(a);
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let b = UnixStream::new(b);
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Ok((a, b))
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}
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pub(crate) fn new(stream: mio_uds::UnixStream) -> UnixStream {
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let io = PollEvented::new(stream);
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UnixStream { io }
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}
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/// Test whether this socket is ready to be read or not.
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pub fn poll_read_ready(&self, ready: Ready) -> Poll<Ready, io::Error> {
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self.io.poll_read_ready(ready)
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}
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/// Test whether this socket is ready to be written to or not.
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pub fn poll_write_ready(&self) -> Poll<Ready, io::Error> {
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self.io.poll_write_ready()
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}
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/// Returns the socket address of the local half of this connection.
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pub fn local_addr(&self) -> io::Result<SocketAddr> {
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self.io.get_ref().local_addr()
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}
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/// Returns the socket address of the remote half of this connection.
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pub fn peer_addr(&self) -> io::Result<SocketAddr> {
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self.io.get_ref().peer_addr()
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}
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/// Returns effective credentials of the process which called `connect` or `socketpair`.
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pub fn peer_cred(&self) -> io::Result<UCred> {
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ucred::get_peer_cred(self)
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}
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/// Returns the value of the `SO_ERROR` option.
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pub fn take_error(&self) -> io::Result<Option<io::Error>> {
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self.io.get_ref().take_error()
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}
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/// Shuts down the read, write, or both halves of this connection.
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///
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/// This function will cause all pending and future I/O calls on the
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/// specified portions to immediately return with an appropriate value
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/// (see the documentation of `Shutdown`).
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pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
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self.io.get_ref().shutdown(how)
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}
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}
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impl Read for UnixStream {
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fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
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self.io.read(buf)
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}
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}
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impl Write for UnixStream {
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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self.io.write(buf)
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}
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fn flush(&mut self) -> io::Result<()> {
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self.io.flush()
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}
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}
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impl AsyncRead for UnixStream {
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unsafe fn prepare_uninitialized_buffer(&self, _: &mut [u8]) -> bool {
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false
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}
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fn read_buf<B: BufMut>(&mut self, buf: &mut B) -> Poll<usize, io::Error> {
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<&UnixStream>::read_buf(&mut &*self, buf)
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}
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}
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impl AsyncWrite for UnixStream {
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fn shutdown(&mut self) -> Poll<(), io::Error> {
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<&UnixStream>::shutdown(&mut &*self)
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}
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fn write_buf<B: Buf>(&mut self, buf: &mut B) -> Poll<usize, io::Error> {
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<&UnixStream>::write_buf(&mut &*self, buf)
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}
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}
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impl<'a> Read for &'a UnixStream {
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fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
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(&self.io).read(buf)
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}
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}
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impl<'a> Write for &'a UnixStream {
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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(&self.io).write(buf)
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}
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fn flush(&mut self) -> io::Result<()> {
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(&self.io).flush()
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}
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}
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impl<'a> AsyncRead for &'a UnixStream {
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unsafe fn prepare_uninitialized_buffer(&self, _: &mut [u8]) -> bool {
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false
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}
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fn read_buf<B: BufMut>(&mut self, buf: &mut B) -> Poll<usize, io::Error> {
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if let Async::NotReady = <UnixStream>::poll_read_ready(self, Ready::readable())? {
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return Ok(Async::NotReady);
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}
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unsafe {
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let r = read_ready(buf, self.as_raw_fd());
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if r == -1 {
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let e = io::Error::last_os_error();
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if e.kind() == io::ErrorKind::WouldBlock {
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self.io.clear_write_ready()?;
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Ok(Async::NotReady)
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} else {
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Err(e)
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}
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} else {
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let r = r as usize;
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buf.advance_mut(r);
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Ok(r.into())
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}
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}
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}
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}
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impl<'a> AsyncWrite for &'a UnixStream {
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fn shutdown(&mut self) -> Poll<(), io::Error> {
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Ok(().into())
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}
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fn write_buf<B: Buf>(&mut self, buf: &mut B) -> Poll<usize, io::Error> {
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if let Async::NotReady = <UnixStream>::poll_write_ready(self)? {
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return Ok(Async::NotReady);
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}
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unsafe {
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let r = write_ready(buf, self.as_raw_fd());
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if r == -1 {
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let e = io::Error::last_os_error();
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if e.kind() == io::ErrorKind::WouldBlock {
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self.io.clear_write_ready()?;
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Ok(Async::NotReady)
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} else {
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Err(e)
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}
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} else {
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let r = r as usize;
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buf.advance(r);
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Ok(r.into())
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}
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}
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}
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}
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impl fmt::Debug for UnixStream {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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self.io.get_ref().fmt(f)
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}
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}
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impl AsRawFd for UnixStream {
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fn as_raw_fd(&self) -> RawFd {
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self.io.get_ref().as_raw_fd()
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}
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}
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impl Future for ConnectFuture {
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type Item = UnixStream;
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type Error = io::Error;
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fn poll(&mut self) -> Poll<UnixStream, io::Error> {
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use std::mem;
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match self.inner {
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State::Waiting(ref mut stream) => {
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if let Async::NotReady = stream.io.poll_write_ready()? {
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return Ok(Async::NotReady)
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}
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if let Some(e) = try!(stream.io.get_ref().take_error()) {
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return Err(e)
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}
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}
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State::Error(_) => {
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let e = match mem::replace(&mut self.inner, State::Empty) {
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State::Error(e) => e,
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_ => unreachable!(),
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};
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return Err(e)
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},
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State::Empty => panic!("can't poll stream twice"),
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}
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match mem::replace(&mut self.inner, State::Empty) {
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State::Waiting(stream) => Ok(Async::Ready(stream)),
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_ => unreachable!(),
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}
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}
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}
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unsafe fn read_ready<B: BufMut>(buf: &mut B, raw_fd: RawFd) -> isize {
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// The `IoVec` type can't have a 0-length size, so we create a bunch
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// of dummy versions on the stack with 1 length which we'll quickly
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// overwrite.
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let b1: &mut [u8] = &mut [0];
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let b2: &mut [u8] = &mut [0];
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let b3: &mut [u8] = &mut [0];
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let b4: &mut [u8] = &mut [0];
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let b5: &mut [u8] = &mut [0];
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let b6: &mut [u8] = &mut [0];
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let b7: &mut [u8] = &mut [0];
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let b8: &mut [u8] = &mut [0];
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let b9: &mut [u8] = &mut [0];
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let b10: &mut [u8] = &mut [0];
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let b11: &mut [u8] = &mut [0];
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let b12: &mut [u8] = &mut [0];
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let b13: &mut [u8] = &mut [0];
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let b14: &mut [u8] = &mut [0];
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let b15: &mut [u8] = &mut [0];
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let b16: &mut [u8] = &mut [0];
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let mut bufs: [&mut IoVec; 16] = [
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b1.into(),
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b2.into(),
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b3.into(),
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b4.into(),
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b5.into(),
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b6.into(),
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b7.into(),
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b8.into(),
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b9.into(),
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b10.into(),
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b11.into(),
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b12.into(),
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b13.into(),
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b14.into(),
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b15.into(),
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b16.into(),
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];
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let n = buf.bytes_vec_mut(&mut bufs);
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read_ready_vecs(&mut bufs[..n], raw_fd)
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}
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unsafe fn read_ready_vecs(bufs: &mut [&mut IoVec], raw_fd: RawFd) -> isize {
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let iovecs = iovec::unix::as_os_slice_mut(bufs);
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libc::readv(raw_fd, iovecs.as_ptr(), iovecs.len() as i32)
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}
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unsafe fn write_ready<B: Buf>(buf: &mut B, raw_fd: RawFd) -> isize {
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// The `IoVec` type can't have a zero-length size, so create a dummy
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// version from a 1-length slice which we'll overwrite with the
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// `bytes_vec` method.
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static DUMMY: &[u8] = &[0];
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let iovec = <&IoVec>::from(DUMMY);
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let mut bufs = [
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iovec, iovec, iovec, iovec, iovec, iovec, iovec, iovec, iovec, iovec, iovec, iovec, iovec,
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iovec, iovec, iovec,
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];
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let n = buf.bytes_vec(&mut bufs);
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write_ready_vecs(&bufs[..n], raw_fd)
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}
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unsafe fn write_ready_vecs(bufs: &[&IoVec], raw_fd: RawFd) -> isize {
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let iovecs = iovec::unix::as_os_slice(bufs);
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libc::writev(raw_fd, iovecs.as_ptr(), iovecs.len() as i32)
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}
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