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//! UDP sockets.
use core::cell::RefCell;
use core::future::poll_fn;
use core::mem;
use core::task::Poll;
use embassy_net_driver::Driver;
use smoltcp::iface::{Interface, SocketHandle};
use smoltcp::socket::udp;
pub use smoltcp::socket::udp::PacketMetadata;
use smoltcp::wire::{IpEndpoint, IpListenEndpoint};
use crate::{SocketStack, Stack};
/// Error returned by [`UdpSocket::bind`].
#[derive(PartialEq, Eq, Clone, Copy, Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum BindError {
/// The socket was already open.
InvalidState,
/// No route to host.
NoRoute,
}
/// Error returned by [`UdpSocket::recv_from`] and [`UdpSocket::send_to`].
#[derive(PartialEq, Eq, Clone, Copy, Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum Error {
/// No route to host.
NoRoute,
}
/// An UDP socket.
pub struct UdpSocket<'a> {
stack: &'a RefCell<SocketStack>,
handle: SocketHandle,
}
impl<'a> UdpSocket<'a> {
/// Create a new UDP socket using the provided stack and buffers.
pub fn new<D: Driver>(
stack: &'a Stack<D>,
rx_meta: &'a mut [PacketMetadata],
rx_buffer: &'a mut [u8],
tx_meta: &'a mut [PacketMetadata],
tx_buffer: &'a mut [u8],
) -> Self {
let s = &mut *stack.socket.borrow_mut();
let rx_meta: &'static mut [PacketMetadata] = unsafe { mem::transmute(rx_meta) };
let rx_buffer: &'static mut [u8] = unsafe { mem::transmute(rx_buffer) };
let tx_meta: &'static mut [PacketMetadata] = unsafe { mem::transmute(tx_meta) };
let tx_buffer: &'static mut [u8] = unsafe { mem::transmute(tx_buffer) };
let handle = s.sockets.add(udp::Socket::new(
udp::PacketBuffer::new(rx_meta, rx_buffer),
udp::PacketBuffer::new(tx_meta, tx_buffer),
));
Self {
stack: &stack.socket,
handle,
}
}
/// Bind the socket to a local endpoint.
pub fn bind<T>(&mut self, endpoint: T) -> Result<(), BindError>
where
T: Into<IpListenEndpoint>,
{
let mut endpoint = endpoint.into();
if endpoint.port == 0 {
// If user didn't specify port allocate a dynamic port.
endpoint.port = self.stack.borrow_mut().get_local_port();
}
match self.with_mut(|s, _| s.bind(endpoint)) {
Ok(()) => Ok(()),
Err(udp::BindError::InvalidState) => Err(BindError::InvalidState),
Err(udp::BindError::Unaddressable) => Err(BindError::NoRoute),
}
}
fn with<R>(&self, f: impl FnOnce(&udp::Socket, &Interface) -> R) -> R {
let s = &*self.stack.borrow();
let socket = s.sockets.get::<udp::Socket>(self.handle);
f(socket, &s.iface)
}
fn with_mut<R>(&self, f: impl FnOnce(&mut udp::Socket, &mut Interface) -> R) -> R {
let s = &mut *self.stack.borrow_mut();
let socket = s.sockets.get_mut::<udp::Socket>(self.handle);
let res = f(socket, &mut s.iface);
s.waker.wake();
res
}
/// Receive a datagram.
///
/// This method will wait until a datagram is received.
///
/// Returns the number of bytes received and the remote endpoint.
pub async fn recv_from(&self, buf: &mut [u8]) -> Result<(usize, IpEndpoint), Error> {
poll_fn(move |cx| {
self.with_mut(|s, _| match s.recv_slice(buf) {
Ok(x) => Poll::Ready(Ok(x)),
// No data ready
Err(udp::RecvError::Exhausted) => {
s.register_recv_waker(cx.waker());
Poll::Pending
}
})
})
.await
}
/// Send a datagram to the specified remote endpoint.
pub async fn send_to<T>(&self, buf: &[u8], remote_endpoint: T) -> Result<(), Error>
where
T: Into<IpEndpoint>,
{
let remote_endpoint = remote_endpoint.into();
poll_fn(move |cx| {
self.with_mut(|s, _| match s.send_slice(buf, remote_endpoint) {
// Entire datagram has been sent
Ok(()) => Poll::Ready(Ok(())),
Err(udp::SendError::BufferFull) => {
s.register_send_waker(cx.waker());
Poll::Pending
}
Err(udp::SendError::Unaddressable) => Poll::Ready(Err(Error::NoRoute)),
})
})
.await
}
/// Returns the local endpoint of the socket.
pub fn endpoint(&self) -> IpListenEndpoint {
self.with(|s, _| s.endpoint())
}
/// Returns whether the socket is open.
pub fn is_open(&self) -> bool {
self.with(|s, _| s.is_open())
}
/// Close the socket.
pub fn close(&mut self) {
self.with_mut(|s, _| s.close())
}
/// Returns whether the socket is ready to send data, i.e. it has enough buffer space to hold a packet.
pub fn may_send(&self) -> bool {
self.with(|s, _| s.can_send())
}
/// Returns whether the socket is ready to receive data, i.e. it has received a packet that's now in the buffer.
pub fn may_recv(&self) -> bool {
self.with(|s, _| s.can_recv())
}
}
impl Drop for UdpSocket<'_> {
fn drop(&mut self) {
self.stack.borrow_mut().sockets.remove(self.handle);
}
}
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