/
pipe.rs
835 lines (728 loc) · 25.1 KB
/
pipe.rs
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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
/*!
Named pipes
This module contains the ability to communicate over named pipes with
synchronous I/O. On windows, this corresponds to talking over a Named Pipe,
while on Unix it corresponds to UNIX domain sockets.
These pipes are similar to TCP in the sense that you can have both a stream to a
server and a server itself. The server provided accepts other `UnixStream`
instances as clients.
*/
#![allow(missing_doc)]
use prelude::*;
use io::{Listener, Acceptor, IoResult, IoError, TimedOut, standard_error};
use rt::rtio::{IoFactory, LocalIo, RtioUnixListener};
use rt::rtio::{RtioUnixAcceptor, RtioPipe};
use time::Duration;
/// A stream which communicates over a named pipe.
pub struct UnixStream {
obj: Box<RtioPipe + Send>,
}
impl UnixStream {
/// Connect to a pipe named by `path`. This will attempt to open a
/// connection to the underlying socket.
///
/// The returned stream will be closed when the object falls out of scope.
///
/// # Example
///
/// ```rust
/// # #![allow(unused_must_use)]
/// use std::io::net::pipe::UnixStream;
///
/// let server = Path::new("path/to/my/socket");
/// let mut stream = UnixStream::connect(&server);
/// stream.write([1, 2, 3]);
/// ```
pub fn connect<P: ToCStr>(path: &P) -> IoResult<UnixStream> {
LocalIo::maybe_raise(|io| {
io.unix_connect(&path.to_c_str(), None).map(|p| UnixStream { obj: p })
}).map_err(IoError::from_rtio_error)
}
/// Connect to a pipe named by `path`, timing out if the specified number of
/// milliseconds.
///
/// This function is similar to `connect`, except that if `timeout`
/// elapses the function will return an error of kind `TimedOut`.
///
/// If a `timeout` with zero or negative duration is specified then
/// the function returns `Err`, with the error kind set to `TimedOut`.
#[experimental = "the timeout argument is likely to change types"]
pub fn connect_timeout<P: ToCStr>(path: &P,
timeout: Duration) -> IoResult<UnixStream> {
if timeout <= Duration::milliseconds(0) {
return Err(standard_error(TimedOut));
}
LocalIo::maybe_raise(|io| {
let s = io.unix_connect(&path.to_c_str(), Some(timeout.num_milliseconds() as u64));
s.map(|p| UnixStream { obj: p })
}).map_err(IoError::from_rtio_error)
}
/// Closes the reading half of this connection.
///
/// This method will close the reading portion of this connection, causing
/// all pending and future reads to immediately return with an error.
///
/// Note that this method affects all cloned handles associated with this
/// stream, not just this one handle.
pub fn close_read(&mut self) -> IoResult<()> {
self.obj.close_read().map_err(IoError::from_rtio_error)
}
/// Closes the writing half of this connection.
///
/// This method will close the writing portion of this connection, causing
/// all pending and future writes to immediately return with an error.
///
/// Note that this method affects all cloned handles associated with this
/// stream, not just this one handle.
pub fn close_write(&mut self) -> IoResult<()> {
self.obj.close_write().map_err(IoError::from_rtio_error)
}
/// Sets the read/write timeout for this socket.
///
/// For more information, see `TcpStream::set_timeout`
#[experimental = "the timeout argument may change in type and value"]
pub fn set_timeout(&mut self, timeout_ms: Option<u64>) {
self.obj.set_timeout(timeout_ms)
}
/// Sets the read timeout for this socket.
///
/// For more information, see `TcpStream::set_timeout`
#[experimental = "the timeout argument may change in type and value"]
pub fn set_read_timeout(&mut self, timeout_ms: Option<u64>) {
self.obj.set_read_timeout(timeout_ms)
}
/// Sets the write timeout for this socket.
///
/// For more information, see `TcpStream::set_timeout`
#[experimental = "the timeout argument may change in type and value"]
pub fn set_write_timeout(&mut self, timeout_ms: Option<u64>) {
self.obj.set_write_timeout(timeout_ms)
}
}
impl Clone for UnixStream {
fn clone(&self) -> UnixStream {
UnixStream { obj: self.obj.clone() }
}
}
impl Reader for UnixStream {
fn read(&mut self, buf: &mut [u8]) -> IoResult<uint> {
self.obj.read(buf).map_err(IoError::from_rtio_error)
}
}
impl Writer for UnixStream {
fn write(&mut self, buf: &[u8]) -> IoResult<()> {
self.obj.write(buf).map_err(IoError::from_rtio_error)
}
}
/// A value that can listen for incoming named pipe connection requests.
pub struct UnixListener {
/// The internal, opaque runtime Unix listener.
obj: Box<RtioUnixListener + Send>,
}
impl UnixListener {
/// Creates a new listener, ready to receive incoming connections on the
/// specified socket. The server will be named by `path`.
///
/// This listener will be closed when it falls out of scope.
///
/// # Example
///
/// ```
/// # fn main() {}
/// # fn foo() {
/// # #![allow(unused_must_use)]
/// use std::io::net::pipe::UnixListener;
/// use std::io::{Listener, Acceptor};
///
/// let server = Path::new("/path/to/my/socket");
/// let stream = UnixListener::bind(&server);
/// for mut client in stream.listen().incoming() {
/// client.write([1, 2, 3, 4]);
/// }
/// # }
/// ```
pub fn bind<P: ToCStr>(path: &P) -> IoResult<UnixListener> {
LocalIo::maybe_raise(|io| {
io.unix_bind(&path.to_c_str()).map(|s| UnixListener { obj: s })
}).map_err(IoError::from_rtio_error)
}
}
impl Listener<UnixStream, UnixAcceptor> for UnixListener {
fn listen(self) -> IoResult<UnixAcceptor> {
self.obj.listen().map(|obj| {
UnixAcceptor { obj: obj }
}).map_err(IoError::from_rtio_error)
}
}
/// A value that can accept named pipe connections, returned from `listen()`.
pub struct UnixAcceptor {
/// The internal, opaque runtime Unix acceptor.
obj: Box<RtioUnixAcceptor + Send>,
}
impl UnixAcceptor {
/// Sets a timeout for this acceptor, after which accept() will no longer
/// block indefinitely.
///
/// The argument specified is the amount of time, in milliseconds, into the
/// future after which all invocations of accept() will not block (and any
/// pending invocation will return). A value of `None` will clear any
/// existing timeout.
///
/// When using this method, it is likely necessary to reset the timeout as
/// appropriate, the timeout specified is specific to this object, not
/// specific to the next request.
#[experimental = "the name and arguments to this function are likely \
to change"]
pub fn set_timeout(&mut self, timeout_ms: Option<u64>) {
self.obj.set_timeout(timeout_ms)
}
/// Closes the accepting capabilities of this acceptor.
///
/// This function has the same semantics as `TcpAcceptor::close_accept`, and
/// more information can be found in that documentation.
#[experimental]
pub fn close_accept(&mut self) -> IoResult<()> {
self.obj.close_accept().map_err(IoError::from_rtio_error)
}
}
impl Acceptor<UnixStream> for UnixAcceptor {
fn accept(&mut self) -> IoResult<UnixStream> {
self.obj.accept().map(|s| {
UnixStream { obj: s }
}).map_err(IoError::from_rtio_error)
}
}
impl Clone for UnixAcceptor {
/// Creates a new handle to this unix acceptor, allowing for simultaneous
/// accepts.
///
/// The underlying unix acceptor will not be closed until all handles to the
/// acceptor have been deallocated. Incoming connections will be received on
/// at most once acceptor, the same connection will not be accepted twice.
///
/// The `close_accept` method will shut down *all* acceptors cloned from the
/// same original acceptor, whereas the `set_timeout` method only affects
/// the selector that it is called on.
///
/// This function is useful for creating a handle to invoke `close_accept`
/// on to wake up any other task blocked in `accept`.
fn clone(&self) -> UnixAcceptor {
UnixAcceptor { obj: self.obj.clone() }
}
}
#[cfg(test)]
#[allow(experimental)]
mod tests {
use prelude::*;
use super::*;
use io::*;
use io::test::*;
use io::fs::PathExtensions;
use time::Duration;
pub fn smalltest(server: proc(UnixStream):Send, client: proc(UnixStream):Send) {
let path1 = next_test_unix();
let path2 = path1.clone();
let mut acceptor = UnixListener::bind(&path1).listen();
spawn(proc() {
match UnixStream::connect(&path2) {
Ok(c) => client(c),
Err(e) => fail!("failed connect: {}", e),
}
});
match acceptor.accept() {
Ok(c) => server(c),
Err(e) => fail!("failed accept: {}", e),
}
}
#[test]
fn bind_error() {
let path = "path/to/nowhere";
match UnixListener::bind(&path) {
Ok(..) => fail!(),
Err(e) => {
assert!(e.kind == PermissionDenied || e.kind == FileNotFound ||
e.kind == InvalidInput);
}
}
}
#[test]
fn connect_error() {
let path = if cfg!(windows) {
r"\\.\pipe\this_should_not_exist_ever"
} else {
"path/to/nowhere"
};
match UnixStream::connect(&path) {
Ok(..) => fail!(),
Err(e) => {
assert!(e.kind == FileNotFound || e.kind == OtherIoError);
}
}
}
#[test]
fn smoke() {
smalltest(proc(mut server) {
let mut buf = [0];
server.read(buf).unwrap();
assert!(buf[0] == 99);
}, proc(mut client) {
client.write([99]).unwrap();
})
}
#[cfg_attr(windows, ignore)] // FIXME(#12516)
#[test]
fn read_eof() {
smalltest(proc(mut server) {
let mut buf = [0];
assert!(server.read(buf).is_err());
assert!(server.read(buf).is_err());
}, proc(_client) {
// drop the client
})
}
#[test]
fn write_begone() {
smalltest(proc(mut server) {
let buf = [0];
loop {
match server.write(buf) {
Ok(..) => {}
Err(e) => {
assert!(e.kind == BrokenPipe ||
e.kind == NotConnected ||
e.kind == ConnectionReset,
"unknown error {:?}", e);
break;
}
}
}
}, proc(_client) {
// drop the client
})
}
#[test]
fn accept_lots() {
let times = 10;
let path1 = next_test_unix();
let path2 = path1.clone();
let mut acceptor = match UnixListener::bind(&path1).listen() {
Ok(a) => a,
Err(e) => fail!("failed listen: {}", e),
};
spawn(proc() {
for _ in range(0u, times) {
let mut stream = UnixStream::connect(&path2);
match stream.write([100]) {
Ok(..) => {}
Err(e) => fail!("failed write: {}", e)
}
}
});
for _ in range(0, times) {
let mut client = acceptor.accept();
let mut buf = [0];
match client.read(buf) {
Ok(..) => {}
Err(e) => fail!("failed read/accept: {}", e),
}
assert_eq!(buf[0], 100);
}
}
#[cfg(unix)]
#[test]
fn path_exists() {
let path = next_test_unix();
let _acceptor = UnixListener::bind(&path).listen();
assert!(path.exists());
}
#[test]
fn unix_clone_smoke() {
let addr = next_test_unix();
let mut acceptor = UnixListener::bind(&addr).listen();
spawn(proc() {
let mut s = UnixStream::connect(&addr);
let mut buf = [0, 0];
debug!("client reading");
assert_eq!(s.read(buf), Ok(1));
assert_eq!(buf[0], 1);
debug!("client writing");
s.write([2]).unwrap();
debug!("client dropping");
});
let mut s1 = acceptor.accept().unwrap();
let s2 = s1.clone();
let (tx1, rx1) = channel();
let (tx2, rx2) = channel();
spawn(proc() {
let mut s2 = s2;
rx1.recv();
debug!("writer writing");
s2.write([1]).unwrap();
debug!("writer done");
tx2.send(());
});
tx1.send(());
let mut buf = [0, 0];
debug!("reader reading");
assert_eq!(s1.read(buf), Ok(1));
debug!("reader done");
rx2.recv();
}
#[test]
fn unix_clone_two_read() {
let addr = next_test_unix();
let mut acceptor = UnixListener::bind(&addr).listen();
let (tx1, rx) = channel();
let tx2 = tx1.clone();
spawn(proc() {
let mut s = UnixStream::connect(&addr);
s.write([1]).unwrap();
rx.recv();
s.write([2]).unwrap();
rx.recv();
});
let mut s1 = acceptor.accept().unwrap();
let s2 = s1.clone();
let (done, rx) = channel();
spawn(proc() {
let mut s2 = s2;
let mut buf = [0, 0];
s2.read(buf).unwrap();
tx2.send(());
done.send(());
});
let mut buf = [0, 0];
s1.read(buf).unwrap();
tx1.send(());
rx.recv();
}
#[test]
fn unix_clone_two_write() {
let addr = next_test_unix();
let mut acceptor = UnixListener::bind(&addr).listen();
spawn(proc() {
let mut s = UnixStream::connect(&addr);
let mut buf = [0, 1];
s.read(buf).unwrap();
s.read(buf).unwrap();
});
let mut s1 = acceptor.accept().unwrap();
let s2 = s1.clone();
let (tx, rx) = channel();
spawn(proc() {
let mut s2 = s2;
s2.write([1]).unwrap();
tx.send(());
});
s1.write([2]).unwrap();
rx.recv();
}
#[cfg(not(windows))]
#[test]
fn drop_removes_listener_path() {
let path = next_test_unix();
let l = UnixListener::bind(&path).unwrap();
assert!(path.exists());
drop(l);
assert!(!path.exists());
}
#[cfg(not(windows))]
#[test]
fn drop_removes_acceptor_path() {
let path = next_test_unix();
let l = UnixListener::bind(&path).unwrap();
assert!(path.exists());
drop(l.listen().unwrap());
assert!(!path.exists());
}
#[test]
fn accept_timeout() {
let addr = next_test_unix();
let mut a = UnixListener::bind(&addr).unwrap().listen().unwrap();
a.set_timeout(Some(10));
// Make sure we time out once and future invocations also time out
let err = a.accept().err().unwrap();
assert_eq!(err.kind, TimedOut);
let err = a.accept().err().unwrap();
assert_eq!(err.kind, TimedOut);
// Also make sure that even though the timeout is expired that we will
// continue to receive any pending connections.
let (tx, rx) = channel();
let addr2 = addr.clone();
spawn(proc() {
tx.send(UnixStream::connect(&addr2).unwrap());
});
let l = rx.recv();
for i in range(0u, 1001) {
match a.accept() {
Ok(..) => break,
Err(ref e) if e.kind == TimedOut => {}
Err(e) => fail!("error: {}", e),
}
::task::deschedule();
if i == 1000 { fail!("should have a pending connection") }
}
drop(l);
// Unset the timeout and make sure that this always blocks.
a.set_timeout(None);
let addr2 = addr.clone();
spawn(proc() {
drop(UnixStream::connect(&addr2).unwrap());
});
a.accept().unwrap();
}
#[test]
fn connect_timeout_error() {
let addr = next_test_unix();
assert!(UnixStream::connect_timeout(&addr, Duration::milliseconds(100)).is_err());
}
#[test]
fn connect_timeout_success() {
let addr = next_test_unix();
let _a = UnixListener::bind(&addr).unwrap().listen().unwrap();
assert!(UnixStream::connect_timeout(&addr, Duration::milliseconds(100)).is_ok());
}
#[test]
fn connect_timeout_zero() {
let addr = next_test_unix();
let _a = UnixListener::bind(&addr).unwrap().listen().unwrap();
assert!(UnixStream::connect_timeout(&addr, Duration::milliseconds(0)).is_err());
}
#[test]
fn connect_timeout_negative() {
let addr = next_test_unix();
let _a = UnixListener::bind(&addr).unwrap().listen().unwrap();
assert!(UnixStream::connect_timeout(&addr, Duration::milliseconds(-1)).is_err());
}
#[test]
fn close_readwrite_smoke() {
let addr = next_test_unix();
let a = UnixListener::bind(&addr).listen().unwrap();
let (_tx, rx) = channel::<()>();
spawn(proc() {
let mut a = a;
let _s = a.accept().unwrap();
let _ = rx.recv_opt();
});
let mut b = [0];
let mut s = UnixStream::connect(&addr).unwrap();
let mut s2 = s.clone();
// closing should prevent reads/writes
s.close_write().unwrap();
assert!(s.write([0]).is_err());
s.close_read().unwrap();
assert!(s.read(b).is_err());
// closing should affect previous handles
assert!(s2.write([0]).is_err());
assert!(s2.read(b).is_err());
// closing should affect new handles
let mut s3 = s.clone();
assert!(s3.write([0]).is_err());
assert!(s3.read(b).is_err());
// make sure these don't die
let _ = s2.close_read();
let _ = s2.close_write();
let _ = s3.close_read();
let _ = s3.close_write();
}
#[test]
fn close_read_wakes_up() {
let addr = next_test_unix();
let a = UnixListener::bind(&addr).listen().unwrap();
let (_tx, rx) = channel::<()>();
spawn(proc() {
let mut a = a;
let _s = a.accept().unwrap();
let _ = rx.recv_opt();
});
let mut s = UnixStream::connect(&addr).unwrap();
let s2 = s.clone();
let (tx, rx) = channel();
spawn(proc() {
let mut s2 = s2;
assert!(s2.read([0]).is_err());
tx.send(());
});
// this should wake up the child task
s.close_read().unwrap();
// this test will never finish if the child doesn't wake up
rx.recv();
}
#[test]
fn readwrite_timeouts() {
let addr = next_test_unix();
let mut a = UnixListener::bind(&addr).listen().unwrap();
let (tx, rx) = channel::<()>();
spawn(proc() {
let mut s = UnixStream::connect(&addr).unwrap();
rx.recv();
assert!(s.write([0]).is_ok());
let _ = rx.recv_opt();
});
let mut s = a.accept().unwrap();
s.set_timeout(Some(20));
assert_eq!(s.read([0]).err().unwrap().kind, TimedOut);
assert_eq!(s.read([0]).err().unwrap().kind, TimedOut);
s.set_timeout(Some(20));
for i in range(0u, 1001) {
match s.write([0, .. 128 * 1024]) {
Ok(()) | Err(IoError { kind: ShortWrite(..), .. }) => {},
Err(IoError { kind: TimedOut, .. }) => break,
Err(e) => fail!("{}", e),
}
if i == 1000 { fail!("should have filled up?!"); }
}
// I'm not sure as to why, but apparently the write on windows always
// succeeds after the previous timeout. Who knows?
if !cfg!(windows) {
assert_eq!(s.write([0]).err().unwrap().kind, TimedOut);
}
tx.send(());
s.set_timeout(None);
assert_eq!(s.read([0, 0]), Ok(1));
}
#[test]
fn read_timeouts() {
let addr = next_test_unix();
let mut a = UnixListener::bind(&addr).listen().unwrap();
let (tx, rx) = channel::<()>();
spawn(proc() {
let mut s = UnixStream::connect(&addr).unwrap();
rx.recv();
let mut amt = 0;
while amt < 100 * 128 * 1024 {
match s.read([0, ..128 * 1024]) {
Ok(n) => { amt += n; }
Err(e) => fail!("{}", e),
}
}
let _ = rx.recv_opt();
});
let mut s = a.accept().unwrap();
s.set_read_timeout(Some(20));
assert_eq!(s.read([0]).err().unwrap().kind, TimedOut);
assert_eq!(s.read([0]).err().unwrap().kind, TimedOut);
tx.send(());
for _ in range(0u, 100) {
assert!(s.write([0, ..128 * 1024]).is_ok());
}
}
#[test]
fn write_timeouts() {
let addr = next_test_unix();
let mut a = UnixListener::bind(&addr).listen().unwrap();
let (tx, rx) = channel::<()>();
spawn(proc() {
let mut s = UnixStream::connect(&addr).unwrap();
rx.recv();
assert!(s.write([0]).is_ok());
let _ = rx.recv_opt();
});
let mut s = a.accept().unwrap();
s.set_write_timeout(Some(20));
for i in range(0u, 1001) {
match s.write([0, .. 128 * 1024]) {
Ok(()) | Err(IoError { kind: ShortWrite(..), .. }) => {},
Err(IoError { kind: TimedOut, .. }) => break,
Err(e) => fail!("{}", e),
}
if i == 1000 { fail!("should have filled up?!"); }
}
tx.send(());
assert!(s.read([0]).is_ok());
}
#[test]
fn timeout_concurrent_read() {
let addr = next_test_unix();
let mut a = UnixListener::bind(&addr).listen().unwrap();
let (tx, rx) = channel::<()>();
spawn(proc() {
let mut s = UnixStream::connect(&addr).unwrap();
rx.recv();
assert!(s.write([0]).is_ok());
let _ = rx.recv_opt();
});
let mut s = a.accept().unwrap();
let s2 = s.clone();
let (tx2, rx2) = channel();
spawn(proc() {
let mut s2 = s2;
assert!(s2.read([0]).is_ok());
tx2.send(());
});
s.set_read_timeout(Some(20));
assert_eq!(s.read([0]).err().unwrap().kind, TimedOut);
tx.send(());
rx2.recv();
}
#[cfg(not(windows))]
#[test]
fn clone_accept_smoke() {
let addr = next_test_unix();
let l = UnixListener::bind(&addr);
let mut a = l.listen().unwrap();
let mut a2 = a.clone();
let addr2 = addr.clone();
spawn(proc() {
let _ = UnixStream::connect(&addr2);
});
spawn(proc() {
let _ = UnixStream::connect(&addr);
});
assert!(a.accept().is_ok());
drop(a);
assert!(a2.accept().is_ok());
}
#[cfg(not(windows))] // FIXME #17553
#[test]
fn clone_accept_concurrent() {
let addr = next_test_unix();
let l = UnixListener::bind(&addr);
let a = l.listen().unwrap();
let a2 = a.clone();
let (tx, rx) = channel();
let tx2 = tx.clone();
spawn(proc() { let mut a = a; tx.send(a.accept()) });
spawn(proc() { let mut a = a2; tx2.send(a.accept()) });
let addr2 = addr.clone();
spawn(proc() {
let _ = UnixStream::connect(&addr2);
});
spawn(proc() {
let _ = UnixStream::connect(&addr);
});
assert!(rx.recv().is_ok());
assert!(rx.recv().is_ok());
}
#[test]
fn close_accept_smoke() {
let addr = next_test_unix();
let l = UnixListener::bind(&addr);
let mut a = l.listen().unwrap();
a.close_accept().unwrap();
assert_eq!(a.accept().err().unwrap().kind, EndOfFile);
}
#[test]
fn close_accept_concurrent() {
let addr = next_test_unix();
let l = UnixListener::bind(&addr);
let a = l.listen().unwrap();
let mut a2 = a.clone();
let (tx, rx) = channel();
spawn(proc() {
let mut a = a;
tx.send(a.accept());
});
a2.close_accept().unwrap();
assert_eq!(rx.recv().err().unwrap().kind, EndOfFile);
}
}