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use crate::io::{Interest, PollEvented}; use crate::net::unix::SocketAddr; use std::convert::TryFrom; use std::fmt; use std::io; use std::net::Shutdown; use std::os::unix::io::{AsRawFd, RawFd}; use std::os::unix::net; use std::path::Path; cfg_net_unix! { /// An I/O object representing a Unix datagram socket. /// /// A socket can be either named (associated with a filesystem path) or /// unnamed. /// /// **Note:** named sockets are persisted even after the object is dropped /// and the program has exited, and cannot be reconnected. It is advised /// that you either check for and unlink the existing socket if it exists, /// or use a temporary file that is guaranteed to not already exist. /// /// # Examples /// Using named sockets, associated with a filesystem path: /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// use tempfile::tempdir; /// /// // We use a temporary directory so that the socket /// // files left by the bound sockets will get cleaned up. /// let tmp = tempdir()?; /// /// // Bind each socket to a filesystem path /// let tx_path = tmp.path().join("tx"); /// let tx = UnixDatagram::bind(&tx_path)?; /// let rx_path = tmp.path().join("rx"); /// let rx = UnixDatagram::bind(&rx_path)?; /// /// let bytes = b"hello world"; /// tx.send_to(bytes, &rx_path).await?; /// /// let mut buf = vec![0u8; 24]; /// let (size, addr) = rx.recv_from(&mut buf).await?; /// /// let dgram = &buf[..size]; /// assert_eq!(dgram, bytes); /// assert_eq!(addr.as_pathname().unwrap(), &tx_path); /// /// # Ok(()) /// # } /// ``` /// /// Using unnamed sockets, created as a pair /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// /// // Create the pair of sockets /// let (sock1, sock2) = UnixDatagram::pair()?; /// /// // Since the sockets are paired, the paired send/recv /// // functions can be used /// let bytes = b"hello world"; /// sock1.send(bytes).await?; /// /// let mut buff = vec![0u8; 24]; /// let size = sock2.recv(&mut buff).await?; /// /// let dgram = &buff[..size]; /// assert_eq!(dgram, bytes); /// /// # Ok(()) /// # } /// ``` pub struct UnixDatagram { io: PollEvented<mio::net::UnixDatagram>, } } impl UnixDatagram { /// Creates a new `UnixDatagram` bound to the specified path. /// /// # Examples /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// use tempfile::tempdir; /// /// // We use a temporary directory so that the socket /// // files left by the bound sockets will get cleaned up. /// let tmp = tempdir()?; /// /// // Bind the socket to a filesystem path /// let socket_path = tmp.path().join("socket"); /// let socket = UnixDatagram::bind(&socket_path)?; /// /// # Ok(()) /// # } /// ``` pub fn bind<P>(path: P) -> io::Result<UnixDatagram> where P: AsRef<Path>, { let socket = mio::net::UnixDatagram::bind(path)?; UnixDatagram::new(socket) } /// Creates an unnamed pair of connected sockets. /// /// This function will create a pair of interconnected Unix sockets for /// communicating back and forth between one another. /// /// # Examples /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// /// // Create the pair of sockets /// let (sock1, sock2) = UnixDatagram::pair()?; /// /// // Since the sockets are paired, the paired send/recv /// // functions can be used /// let bytes = b"hail eris"; /// sock1.send(bytes).await?; /// /// let mut buff = vec![0u8; 24]; /// let size = sock2.recv(&mut buff).await?; /// /// let dgram = &buff[..size]; /// assert_eq!(dgram, bytes); /// /// # Ok(()) /// # } /// ``` pub fn pair() -> io::Result<(UnixDatagram, UnixDatagram)> { let (a, b) = mio::net::UnixDatagram::pair()?; let a = UnixDatagram::new(a)?; let b = UnixDatagram::new(b)?; Ok((a, b)) } /// Creates new `UnixDatagram` from a `std::os::unix::net::UnixDatagram`. /// /// This function is intended to be used to wrap a UnixDatagram from the /// standard library in the Tokio equivalent. The conversion assumes /// nothing about the underlying datagram; it is left up to the user to set /// it in non-blocking mode. /// /// # Panics /// /// This function panics if thread-local runtime is not set. /// /// The runtime is usually set implicitly when this function is called /// from a future driven by a Tokio runtime, otherwise runtime can be set /// explicitly with [`Runtime::enter`](crate::runtime::Runtime::enter) function. /// # Examples /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// use std::os::unix::net::UnixDatagram as StdUDS; /// use tempfile::tempdir; /// /// // We use a temporary directory so that the socket /// // files left by the bound sockets will get cleaned up. /// let tmp = tempdir()?; /// /// // Bind the socket to a filesystem path /// let socket_path = tmp.path().join("socket"); /// let std_socket = StdUDS::bind(&socket_path)?; /// std_socket.set_nonblocking(true)?; /// let tokio_socket = UnixDatagram::from_std(std_socket)?; /// /// # Ok(()) /// # } /// ``` pub fn from_std(datagram: net::UnixDatagram) -> io::Result<UnixDatagram> { let socket = mio::net::UnixDatagram::from_std(datagram); let io = PollEvented::new(socket)?; Ok(UnixDatagram { io }) } fn new(socket: mio::net::UnixDatagram) -> io::Result<UnixDatagram> { let io = PollEvented::new(socket)?; Ok(UnixDatagram { io }) } /// Creates a new `UnixDatagram` which is not bound to any address. /// /// # Examples /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// use tempfile::tempdir; /// /// // Create an unbound socket /// let tx = UnixDatagram::unbound()?; /// /// // Create another, bound socket /// let tmp = tempdir()?; /// let rx_path = tmp.path().join("rx"); /// let rx = UnixDatagram::bind(&rx_path)?; /// /// // Send to the bound socket /// let bytes = b"hello world"; /// tx.send_to(bytes, &rx_path).await?; /// /// let mut buf = vec![0u8; 24]; /// let (size, addr) = rx.recv_from(&mut buf).await?; /// /// let dgram = &buf[..size]; /// assert_eq!(dgram, bytes); /// /// # Ok(()) /// # } /// ``` pub fn unbound() -> io::Result<UnixDatagram> { let socket = mio::net::UnixDatagram::unbound()?; UnixDatagram::new(socket) } /// Connects the socket to the specified address. /// /// The `send` method may be used to send data to the specified address. /// `recv` and `recv_from` will only receive data from that address. /// /// # Examples /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// use tempfile::tempdir; /// /// // Create an unbound socket /// let tx = UnixDatagram::unbound()?; /// /// // Create another, bound socket /// let tmp = tempdir()?; /// let rx_path = tmp.path().join("rx"); /// let rx = UnixDatagram::bind(&rx_path)?; /// /// // Connect to the bound socket /// tx.connect(&rx_path)?; /// /// // Send to the bound socket /// let bytes = b"hello world"; /// tx.send(bytes).await?; /// /// let mut buf = vec![0u8; 24]; /// let (size, addr) = rx.recv_from(&mut buf).await?; /// /// let dgram = &buf[..size]; /// assert_eq!(dgram, bytes); /// /// # Ok(()) /// # } /// ``` pub fn connect<P: AsRef<Path>>(&self, path: P) -> io::Result<()> { self.io.connect(path) } /// Sends data on the socket to the socket's peer. /// /// # Examples /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// /// // Create the pair of sockets /// let (sock1, sock2) = UnixDatagram::pair()?; /// /// // Since the sockets are paired, the paired send/recv /// // functions can be used /// let bytes = b"hello world"; /// sock1.send(bytes).await?; /// /// let mut buff = vec![0u8; 24]; /// let size = sock2.recv(&mut buff).await?; /// /// let dgram = &buff[..size]; /// assert_eq!(dgram, bytes); /// /// # Ok(()) /// # } /// ``` pub async fn send(&self, buf: &[u8]) -> io::Result<usize> { self.io .registration() .async_io(Interest::WRITABLE, || self.io.send(buf)) .await } /// Try to send a datagram to the peer without waiting. /// /// # Examples /// ``` /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn std::error::Error>> { /// use tokio::net::UnixDatagram; /// /// let bytes = b"bytes"; /// // We use a socket pair so that they are assigned /// // each other as a peer. /// let (first, second) = UnixDatagram::pair()?; /// /// let size = first.try_send(bytes)?; /// assert_eq!(size, bytes.len()); /// /// let mut buffer = vec![0u8; 24]; /// let size = second.try_recv(&mut buffer)?; /// /// let dgram = &buffer[..size]; /// assert_eq!(dgram, bytes); /// # Ok(()) /// # } /// ``` pub fn try_send(&self, buf: &[u8]) -> io::Result<usize> { self.io.send(buf) } /// Try to send a datagram to the peer without waiting. /// /// # Examples /// ``` /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn std::error::Error>> { /// use tokio::net::UnixDatagram; /// use tempfile::tempdir; /// /// let bytes = b"bytes"; /// // We use a temporary directory so that the socket /// // files left by the bound sockets will get cleaned up. /// let tmp = tempdir().unwrap(); /// /// let server_path = tmp.path().join("server"); /// let server = UnixDatagram::bind(&server_path)?; /// /// let client_path = tmp.path().join("client"); /// let client = UnixDatagram::bind(&client_path)?; /// /// let size = client.try_send_to(bytes, &server_path)?; /// assert_eq!(size, bytes.len()); /// /// let mut buffer = vec![0u8; 24]; /// let (size, addr) = server.try_recv_from(&mut buffer)?; /// /// let dgram = &buffer[..size]; /// assert_eq!(dgram, bytes); /// assert_eq!(addr.as_pathname().unwrap(), &client_path); /// # Ok(()) /// # } /// ``` pub fn try_send_to<P>(&self, buf: &[u8], target: P) -> io::Result<usize> where P: AsRef<Path>, { self.io.send_to(buf, target) } /// Receives data from the socket. /// /// # Examples /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// /// // Create the pair of sockets /// let (sock1, sock2) = UnixDatagram::pair()?; /// /// // Since the sockets are paired, the paired send/recv /// // functions can be used /// let bytes = b"hello world"; /// sock1.send(bytes).await?; /// /// let mut buff = vec![0u8; 24]; /// let size = sock2.recv(&mut buff).await?; /// /// let dgram = &buff[..size]; /// assert_eq!(dgram, bytes); /// /// # Ok(()) /// # } /// ``` pub async fn recv(&self, buf: &mut [u8]) -> io::Result<usize> { self.io .registration() .async_io(Interest::READABLE, || self.io.recv(buf)) .await } /// Try to receive a datagram from the peer without waiting. /// /// # Examples /// ``` /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn std::error::Error>> { /// use tokio::net::UnixDatagram; /// /// let bytes = b"bytes"; /// // We use a socket pair so that they are assigned /// // each other as a peer. /// let (first, second) = UnixDatagram::pair()?; /// /// let size = first.try_send(bytes)?; /// assert_eq!(size, bytes.len()); /// /// let mut buffer = vec![0u8; 24]; /// let size = second.try_recv(&mut buffer)?; /// /// let dgram = &buffer[..size]; /// assert_eq!(dgram, bytes); /// # Ok(()) /// # } /// ``` pub fn try_recv(&self, buf: &mut [u8]) -> io::Result<usize> { self.io.recv(buf) } /// Sends data on the socket to the specified address. /// /// # Examples /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// use tempfile::tempdir; /// /// // We use a temporary directory so that the socket /// // files left by the bound sockets will get cleaned up. /// let tmp = tempdir()?; /// /// // Bind each socket to a filesystem path /// let tx_path = tmp.path().join("tx"); /// let tx = UnixDatagram::bind(&tx_path)?; /// let rx_path = tmp.path().join("rx"); /// let rx = UnixDatagram::bind(&rx_path)?; /// /// let bytes = b"hello world"; /// tx.send_to(bytes, &rx_path).await?; /// /// let mut buf = vec![0u8; 24]; /// let (size, addr) = rx.recv_from(&mut buf).await?; /// /// let dgram = &buf[..size]; /// assert_eq!(dgram, bytes); /// assert_eq!(addr.as_pathname().unwrap(), &tx_path); /// /// # Ok(()) /// # } /// ``` pub async fn send_to<P>(&self, buf: &[u8], target: P) -> io::Result<usize> where P: AsRef<Path>, { self.io .registration() .async_io(Interest::WRITABLE, || self.io.send_to(buf, target.as_ref())) .await } /// Receives data from the socket. /// /// # Examples /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// use tempfile::tempdir; /// /// // We use a temporary directory so that the socket /// // files left by the bound sockets will get cleaned up. /// let tmp = tempdir()?; /// /// // Bind each socket to a filesystem path /// let tx_path = tmp.path().join("tx"); /// let tx = UnixDatagram::bind(&tx_path)?; /// let rx_path = tmp.path().join("rx"); /// let rx = UnixDatagram::bind(&rx_path)?; /// /// let bytes = b"hello world"; /// tx.send_to(bytes, &rx_path).await?; /// /// let mut buf = vec![0u8; 24]; /// let (size, addr) = rx.recv_from(&mut buf).await?; /// /// let dgram = &buf[..size]; /// assert_eq!(dgram, bytes); /// assert_eq!(addr.as_pathname().unwrap(), &tx_path); /// /// # Ok(()) /// # } /// ``` pub async fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> { let (n, addr) = self .io .registration() .async_io(Interest::READABLE, || self.io.recv_from(buf)) .await?; Ok((n, SocketAddr(addr))) } /// Try to receive data from the socket without waiting. /// /// # Examples /// ``` /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn std::error::Error>> { /// use tokio::net::UnixDatagram; /// use tempfile::tempdir; /// /// let bytes = b"bytes"; /// // We use a temporary directory so that the socket /// // files left by the bound sockets will get cleaned up. /// let tmp = tempdir().unwrap(); /// /// let server_path = tmp.path().join("server"); /// let server = UnixDatagram::bind(&server_path)?; /// /// let client_path = tmp.path().join("client"); /// let client = UnixDatagram::bind(&client_path)?; /// /// let size = client.try_send_to(bytes, &server_path)?; /// assert_eq!(size, bytes.len()); /// /// let mut buffer = vec![0u8; 24]; /// let (size, addr) = server.try_recv_from(&mut buffer)?; /// /// let dgram = &buffer[..size]; /// assert_eq!(dgram, bytes); /// assert_eq!(addr.as_pathname().unwrap(), &client_path); /// # Ok(()) /// # } /// ``` pub fn try_recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> { let (n, addr) = self.io.recv_from(buf)?; Ok((n, SocketAddr(addr))) } /// Returns the local address that this socket is bound to. /// /// # Examples /// For a socket bound to a local path /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// use tempfile::tempdir; /// /// // We use a temporary directory so that the socket /// // files left by the bound sockets will get cleaned up. /// let tmp = tempdir()?; /// /// // Bind socket to a filesystem path /// let socket_path = tmp.path().join("socket"); /// let socket = UnixDatagram::bind(&socket_path)?; /// /// assert_eq!(socket.local_addr()?.as_pathname().unwrap(), &socket_path); /// /// # Ok(()) /// # } /// ``` /// /// For an unbound socket /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// /// // Create an unbound socket /// let socket = UnixDatagram::unbound()?; /// /// assert!(socket.local_addr()?.is_unnamed()); /// /// # Ok(()) /// # } /// ``` pub fn local_addr(&self) -> io::Result<SocketAddr> { self.io.local_addr().map(SocketAddr) } /// Returns the address of this socket's peer. /// /// The `connect` method will connect the socket to a peer. /// /// # Examples /// For a peer with a local path /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// use tempfile::tempdir; /// /// // Create an unbound socket /// let tx = UnixDatagram::unbound()?; /// /// // Create another, bound socket /// let tmp = tempdir()?; /// let rx_path = tmp.path().join("rx"); /// let rx = UnixDatagram::bind(&rx_path)?; /// /// // Connect to the bound socket /// tx.connect(&rx_path)?; /// /// assert_eq!(tx.peer_addr()?.as_pathname().unwrap(), &rx_path); /// /// # Ok(()) /// # } /// ``` /// /// For an unbound peer /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// /// // Create the pair of sockets /// let (sock1, sock2) = UnixDatagram::pair()?; /// /// assert!(sock1.peer_addr()?.is_unnamed()); /// /// # Ok(()) /// # } /// ``` pub fn peer_addr(&self) -> io::Result<SocketAddr> { self.io.peer_addr().map(SocketAddr) } /// Returns the value of the `SO_ERROR` option. /// /// # Examples /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// /// // Create an unbound socket /// let socket = UnixDatagram::unbound()?; /// /// if let Ok(Some(err)) = socket.take_error() { /// println!("Got error: {:?}", err); /// } /// /// # Ok(()) /// # } /// ``` pub fn take_error(&self) -> io::Result<Option<io::Error>> { self.io.take_error() } /// Shuts down the read, write, or both halves of this connection. /// /// This function will cause all pending and future I/O calls on the /// specified portions to immediately return with an appropriate value /// (see the documentation of `Shutdown`). /// /// # Examples /// ``` /// # use std::error::Error; /// # #[tokio::main] /// # async fn main() -> Result<(), Box<dyn Error>> { /// use tokio::net::UnixDatagram; /// use std::net::Shutdown; /// /// // Create an unbound socket /// let (socket, other) = UnixDatagram::pair()?; /// /// socket.shutdown(Shutdown::Both)?; /// /// // NOTE: the following commented out code does NOT work as expected. /// // Due to an underlying issue, the recv call will block indefinitely. /// // See: https://github.com/tokio-rs/tokio/issues/1679 /// //let mut buff = vec![0u8; 24]; /// //let size = socket.recv(&mut buff).await?; /// //assert_eq!(size, 0); /// /// let send_result = socket.send(b"hello world").await; /// assert!(send_result.is_err()); /// /// # Ok(()) /// # } /// ``` pub fn shutdown(&self, how: Shutdown) -> io::Result<()> { self.io.shutdown(how) } } impl TryFrom<std::os::unix::net::UnixDatagram> for UnixDatagram { type Error = io::Error; /// Consumes stream, returning the Tokio I/O object. /// /// This is equivalent to /// [`UnixDatagram::from_std(stream)`](UnixDatagram::from_std). fn try_from(stream: std::os::unix::net::UnixDatagram) -> Result<Self, Self::Error> { Self::from_std(stream) } } impl fmt::Debug for UnixDatagram { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { self.io.fmt(f) } } impl AsRawFd for UnixDatagram { fn as_raw_fd(&self) -> RawFd { self.io.as_raw_fd() } }