Require explicitly closing TcpStreams

Instead of automatically closing and draining the TcpStream in the Drop
implementation instead expect the user to call TcpStream::close.
Add close called to all users of TcpStream.
Document the requirement to call close on TcpListener::accept, this seems
to be the only way to get a new TcpStream at the moment.
This commit is contained in:
Michael Birtwell 2022-04-12 12:08:01 +01:00 committed by Sebastien Bourdeauducq
parent 1fe59d27dc
commit 671453938b
5 changed files with 25 additions and 44 deletions

View File

@ -79,5 +79,7 @@ pub fn thread(io: Io) {
Ok(()) => (),
Err(err) => error!("analyzer aborted: {}", err)
}
stream.close().expect("analyzer: close socket")
}
}

View File

@ -131,6 +131,7 @@ pub fn thread(io: Io) {
Err(Error::Io(IoError::UnexpectedEnd)) => (),
Err(err) => error!("aborted: {}", err)
}
stream.close().expect("mgmt: close socket");
});
}
}

View File

@ -214,6 +214,7 @@ pub fn thread(io: Io, aux_mutex: &Mutex, routing_table: &Urc<RefCell<drtio_routi
Ok(()) => {},
Err(err) => error!("moninj aborted: {}", err)
}
stream.close().expect("moninj: close socket");
});
}
}

View File

@ -250,26 +250,14 @@ impl<'a> Io<'a> {
})
}
pub fn inner_until<F: FnMut() -> bool>(
&self,
timeout: Option<u64>,
mut f: F
) -> Result<(), Error> {
pub fn until<F: FnMut() -> bool>(&self, mut f: F) -> Result<(), Error> {
let f = unsafe { mem::transmute::<&mut dyn FnMut() -> bool, *mut dyn FnMut() -> bool>(&mut f) };
self.suspend(WaitRequest {
timeout,
event: Some(f),
timeout: None,
event: Some(f)
})
}
pub fn until<F: FnMut() -> bool>(&self, f: F) -> Result<(), Error> {
self.inner_until(None, f)
}
pub fn until_with_timeout<F: FnMut() -> bool>(&self, timeout: u64, f: F) -> Result<(), Error> {
self.inner_until(Some(timeout), f)
}
pub fn until_ok<T, E, F>(&self, mut f: F) -> Result<T, Error>
where F: FnMut() -> result::Result<T, E>
{
@ -325,15 +313,7 @@ macro_rules! until {
let $var = network.get_socket::<$ty>(handle);
$cond
})
});
($socket:expr, $ty:ty, timeout=$timeout:expr, |$var:ident| $cond:expr) => ({
let (network, handle) = ($socket.io.network.clone(), $socket.handle);
$socket.io.until_with_timeout($timeout, move || {
let mut network = network.borrow_mut();
let $var = network.get_socket::<$ty>(handle);
$cond
})
});
})
}
type TcpSocketBuffer = ::smoltcp::socket::TcpSocketBuffer<'static>;
@ -397,6 +377,10 @@ impl<'a> TcpListener<'a> {
.map_err(|err| err.into())
}
/// Accept a TCP connection
///
/// When the returned TcpStream is dropped it is immediately forgotten about. In order to
/// ensure that pending data is sent and the far end is notified, `close` must be called.
pub fn accept(&self) -> Result<TcpStream<'a>, Error> {
// We're waiting until at least one half of the connection becomes open.
// This handles the case where a remote socket immediately sends a FIN--
@ -586,28 +570,20 @@ impl<'a> Write for TcpStream<'a> {
impl<'a> Drop for TcpStream<'a> {
fn drop(&mut self) {
self.with_lower(|s| s.close());
let result = until!(
self, TcpSocketLower, timeout=clock::get_ms() + 1000, |s| !s.is_active()
// There's no point calling the lower close here unless we also defer the removal of the
// socket from smoltcp until it's had a chance to process the event
let (unsent_bytes, is_open) = self.with_lower(
|s| (s.send_queue(), s.is_open())
);
let unsent_bytes = self.with_lower(|s| s.send_queue());
match result{
Ok(()) => {
if unsent_bytes != 0 {
// This is normal if we received a reset whilst sending
debug!("Dropping socket with {} bytes unsent", unsent_bytes)
}
}
Err(Error::TimedOut) => {
warn!(
"Timed out whilst waiting for socket to close during drop, with {} unsent bytes",
unsent_bytes
);
}
Err(e) => {
error!("Unexpected error whilst waiting for socket to close during drop: {:?}", e)
}
if is_open {
warn!(
"Dropping open TcpStream in state {}, with {} unsent bytes",
self.with_lower(|s| s.state()), unsent_bytes
)
} else if unsent_bytes != 0 {
debug!("Dropping socket with {} bytes unsent", unsent_bytes)
}
self.io.network.borrow_mut().remove_socket(self.handle);
}
}

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@ -650,6 +650,7 @@ pub fn thread(io: Io, aux_mutex: &Mutex,
error!("session aborted: {}", err);
}
}
stream.close().expect("session: close socket");
});
}