105 lines
3.2 KiB
Rust
105 lines
3.2 KiB
Rust
use std::fmt::Debug;
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use std::net::{ToSocketAddrs, UdpSocket};
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use log::{debug, info};
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use crate::Packet;
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/// A connection to the display.
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pub struct Connection {
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socket: UdpSocket,
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}
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impl Connection {
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/// Open a new UDP socket and connect to the provided host.
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///
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/// Note that this is UDP, which means that the open call can succeed even if the display is unreachable.
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///
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/// # Examples
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/// ```rust
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/// let connection = servicepoint2::Connection::open("172.23.42.29:2342")
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/// .expect("connection failed");
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/// ```
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pub fn open(addr: impl ToSocketAddrs + Debug) -> std::io::Result<Self> {
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info!("connecting to {addr:?}");
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let socket = UdpSocket::bind("0.0.0.0:0")?;
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socket.connect(addr)?;
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Ok(Self { socket })
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}
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/// Send something packet-like to the display. Usually this is in the form of a Command.
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///
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/// # Arguments
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///
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/// * `packet`: the packet-like to send
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///
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/// returns: Ok if packet was sent, otherwise socket error
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///
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/// # Examples
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///
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/// ```rust
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/// let connection = servicepoint2::Connection::open("172.23.42.29:2342")
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/// .expect("connection failed");
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///
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/// // turn off all pixels
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/// connection.send(servicepoint2::Command::Clear)
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/// .expect("send failed");
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///
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/// // turn on all pixels
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/// let mut pixels = servicepoint2::PixelGrid::max_sized();
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/// pixels.fill(true);
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///
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/// // send pixels to display
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/// connection.send(servicepoint2::Command::BitmapLinearWin(servicepoint2::Origin::top_left(), pixels))
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/// .expect("send failed");
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/// ```
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pub fn send(
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&self,
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packet: impl Into<Packet> + Debug,
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) -> Result<(), std::io::Error> {
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debug!("sending {packet:?}");
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let packet: Packet = packet.into();
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let data: Vec<u8> = packet.into();
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self.socket.send(&*data)?;
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Ok(())
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}
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}
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pub mod c_api
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{
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use std::ffi::{c_char, CStr};
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use std::ptr::null_mut;
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use crate::{Command, Connection};
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/// Creates a new instance of Connection.
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/// The returned instance has to be deallocated with `connection_dealloc`.
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///
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/// returns: NULL if connection fails or connected instance
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///
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/// Panics: bad string encoding
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#[no_mangle]
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pub unsafe extern "C" fn connection_open(host: *const c_char) -> *mut Connection {
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let host = CStr::from_ptr(host).to_str().expect("Bad encoding");
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let connection = match Connection::open(host) {
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Err(_) => return null_mut(),
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Ok(value) => value
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};
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let boxed = Box::new(connection);
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Box::into_raw(boxed)
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}
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/// Sends the command instance. The instance is consumed / destroyed and cannot be used after this call.
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#[no_mangle]
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pub unsafe extern "C" fn connection_send(connection: *const Connection, command_ptr: *mut Command) -> bool{
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let command = Box::from_raw(command_ptr);
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(*connection).send(*command).is_ok()
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}
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/// Closes and deallocates a connection instance
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#[no_mangle]
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pub unsafe extern "C" fn connection_dealloc(ptr: *mut Connection) {
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_ = Box::from_raw(ptr);
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}
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} |