Struct NetcodeClient 

pub struct NetcodeClient { /* private fields */ }

A client that can generate encrypted packets that be sent to the connected server, or consume encrypted packets from the server. The client is agnostic from the transport layer, only consuming and generating bytes that can be transported in any way desired.

Implementations

impl NetcodeClient

pub fn new( current_time: Duration, authentication: ClientAuthentication, ) -> Result<Self, NetcodeError>

Examples found in repository

examples/echo.rs (line 174)

fn client(authentication: ClientAuthentication) {
    let udp_socket = UdpSocket::bind("127.0.0.1:0").unwrap();
    udp_socket.set_nonblocking(true).unwrap();
    let now = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
    let mut client = NetcodeClient::new(now, authentication).unwrap();
    let stdin_channel = spawn_stdin_channel();
    let mut buffer = [0u8; NETCODE_MAX_PACKET_BYTES];

    let mut last_updated = Instant::now();
    loop {
        if let Some(err) = client.disconnect_reason() {
            panic!("Client error: {:?}", err);
        }

        match stdin_channel.try_recv() {
            Ok(text) => {
                if client.is_connected() {
                    let (addr, payload) = client.generate_payload_packet(text.as_bytes()).unwrap();
                    udp_socket.send_to(payload, addr).unwrap();
                } else {
                    println!("Client is not yet connected");
                }
            }
            Err(TryRecvError::Empty) => {}
            Err(TryRecvError::Disconnected) => panic!("Stdin channel disconnected"),
        }

        loop {
            match udp_socket.recv_from(&mut buffer) {
                Ok((len, addr)) => {
                    if addr != client.server_addr() {
                        // Ignore packets that are not from the server
                        continue;
                    }
                    // println!("Received decrypted message {:?} from server {}", &buffer[..len], addr);
                    if let Some(payload) = client.process_packet(&mut buffer[..len]) {
                        let text = String::from_utf8(payload.to_vec()).unwrap();
                        println!("Received message from server: {}", text);
                    }
                }
                Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => break,
                Err(e) => panic!("Socket error: {}", e),
            };
        }

        if let Some((packet, addr)) = client.update(Instant::now() - last_updated) {
            udp_socket.send_to(packet, addr).unwrap();
        }
        last_updated = Instant::now();
        thread::sleep(Duration::from_millis(50));
    }
}

pub fn is_connecting(&self) -> bool

pub fn is_connected(&self) -> bool

Examples found in repository

examples/echo.rs (line 186)

fn client(authentication: ClientAuthentication) {
    let udp_socket = UdpSocket::bind("127.0.0.1:0").unwrap();
    udp_socket.set_nonblocking(true).unwrap();
    let now = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
    let mut client = NetcodeClient::new(now, authentication).unwrap();
    let stdin_channel = spawn_stdin_channel();
    let mut buffer = [0u8; NETCODE_MAX_PACKET_BYTES];

    let mut last_updated = Instant::now();
    loop {
        if let Some(err) = client.disconnect_reason() {
            panic!("Client error: {:?}", err);
        }

        match stdin_channel.try_recv() {
            Ok(text) => {
                if client.is_connected() {
                    let (addr, payload) = client.generate_payload_packet(text.as_bytes()).unwrap();
                    udp_socket.send_to(payload, addr).unwrap();
                } else {
                    println!("Client is not yet connected");
                }
            }
            Err(TryRecvError::Empty) => {}
            Err(TryRecvError::Disconnected) => panic!("Stdin channel disconnected"),
        }

        loop {
            match udp_socket.recv_from(&mut buffer) {
                Ok((len, addr)) => {
                    if addr != client.server_addr() {
                        // Ignore packets that are not from the server
                        continue;
                    }
                    // println!("Received decrypted message {:?} from server {}", &buffer[..len], addr);
                    if let Some(payload) = client.process_packet(&mut buffer[..len]) {
                        let text = String::from_utf8(payload.to_vec()).unwrap();
                        println!("Received message from server: {}", text);
                    }
                }
                Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => break,
                Err(e) => panic!("Socket error: {}", e),
            };
        }

        if let Some((packet, addr)) = client.update(Instant::now() - last_updated) {
            udp_socket.send_to(packet, addr).unwrap();
        }
        last_updated = Instant::now();
        thread::sleep(Duration::from_millis(50));
    }
}

pub fn is_disconnected(&self) -> bool

pub fn current_time(&self) -> Duration

pub fn client_id(&self) -> u64

pub fn time_since_last_received_packet(&self) -> Duration

Returns the duration since the client last received a packet. Usefull to detect timeouts.

pub fn disconnect_reason(&self) -> Option<DisconnectReason>

Returns the reason that the client was disconnected for.

Examples found in repository

examples/echo.rs (line 180)

fn client(authentication: ClientAuthentication) {
    let udp_socket = UdpSocket::bind("127.0.0.1:0").unwrap();
    udp_socket.set_nonblocking(true).unwrap();
    let now = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
    let mut client = NetcodeClient::new(now, authentication).unwrap();
    let stdin_channel = spawn_stdin_channel();
    let mut buffer = [0u8; NETCODE_MAX_PACKET_BYTES];

    let mut last_updated = Instant::now();
    loop {
        if let Some(err) = client.disconnect_reason() {
            panic!("Client error: {:?}", err);
        }

        match stdin_channel.try_recv() {
            Ok(text) => {
                if client.is_connected() {
                    let (addr, payload) = client.generate_payload_packet(text.as_bytes()).unwrap();
                    udp_socket.send_to(payload, addr).unwrap();
                } else {
                    println!("Client is not yet connected");
                }
            }
            Err(TryRecvError::Empty) => {}
            Err(TryRecvError::Disconnected) => panic!("Stdin channel disconnected"),
        }

        loop {
            match udp_socket.recv_from(&mut buffer) {
                Ok((len, addr)) => {
                    if addr != client.server_addr() {
                        // Ignore packets that are not from the server
                        continue;
                    }
                    // println!("Received decrypted message {:?} from server {}", &buffer[..len], addr);
                    if let Some(payload) = client.process_packet(&mut buffer[..len]) {
                        let text = String::from_utf8(payload.to_vec()).unwrap();
                        println!("Received message from server: {}", text);
                    }
                }
                Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => break,
                Err(e) => panic!("Socket error: {}", e),
            };
        }

        if let Some((packet, addr)) = client.update(Instant::now() - last_updated) {
            udp_socket.send_to(packet, addr).unwrap();
        }
        last_updated = Instant::now();
        thread::sleep(Duration::from_millis(50));
    }
}

pub fn server_addr(&self) -> SocketAddr

Returns the current server address the client is connected or trying to connect.

Examples found in repository

examples/echo.rs (line 200)

fn client(authentication: ClientAuthentication) {
    let udp_socket = UdpSocket::bind("127.0.0.1:0").unwrap();
    udp_socket.set_nonblocking(true).unwrap();
    let now = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
    let mut client = NetcodeClient::new(now, authentication).unwrap();
    let stdin_channel = spawn_stdin_channel();
    let mut buffer = [0u8; NETCODE_MAX_PACKET_BYTES];

    let mut last_updated = Instant::now();
    loop {
        if let Some(err) = client.disconnect_reason() {
            panic!("Client error: {:?}", err);
        }

        match stdin_channel.try_recv() {
            Ok(text) => {
                if client.is_connected() {
                    let (addr, payload) = client.generate_payload_packet(text.as_bytes()).unwrap();
                    udp_socket.send_to(payload, addr).unwrap();
                } else {
                    println!("Client is not yet connected");
                }
            }
            Err(TryRecvError::Empty) => {}
            Err(TryRecvError::Disconnected) => panic!("Stdin channel disconnected"),
        }

        loop {
            match udp_socket.recv_from(&mut buffer) {
                Ok((len, addr)) => {
                    if addr != client.server_addr() {
                        // Ignore packets that are not from the server
                        continue;
                    }
                    // println!("Received decrypted message {:?} from server {}", &buffer[..len], addr);
                    if let Some(payload) = client.process_packet(&mut buffer[..len]) {
                        let text = String::from_utf8(payload.to_vec()).unwrap();
                        println!("Received message from server: {}", text);
                    }
                }
                Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => break,
                Err(e) => panic!("Socket error: {}", e),
            };
        }

        if let Some((packet, addr)) = client.update(Instant::now() - last_updated) {
            udp_socket.send_to(packet, addr).unwrap();
        }
        last_updated = Instant::now();
        thread::sleep(Duration::from_millis(50));
    }
}

pub fn disconnect(&mut self) -> Result<(SocketAddr, &mut [u8]), NetcodeError>

Disconnect the client from the server. Returns a disconnect packet that should be sent to the server.

pub fn process_packet<'a>(&mut self, buffer: &'a mut [u8]) -> Option<&'a [u8]>

Process any packet received from the server. This function might return a payload sent from the server. If nothing is returned, it was a packet used for the internal protocol or an invalid packet.

Examples found in repository

examples/echo.rs (line 205)

fn client(authentication: ClientAuthentication) {
    let udp_socket = UdpSocket::bind("127.0.0.1:0").unwrap();
    udp_socket.set_nonblocking(true).unwrap();
    let now = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
    let mut client = NetcodeClient::new(now, authentication).unwrap();
    let stdin_channel = spawn_stdin_channel();
    let mut buffer = [0u8; NETCODE_MAX_PACKET_BYTES];

    let mut last_updated = Instant::now();
    loop {
        if let Some(err) = client.disconnect_reason() {
            panic!("Client error: {:?}", err);
        }

        match stdin_channel.try_recv() {
            Ok(text) => {
                if client.is_connected() {
                    let (addr, payload) = client.generate_payload_packet(text.as_bytes()).unwrap();
                    udp_socket.send_to(payload, addr).unwrap();
                } else {
                    println!("Client is not yet connected");
                }
            }
            Err(TryRecvError::Empty) => {}
            Err(TryRecvError::Disconnected) => panic!("Stdin channel disconnected"),
        }

        loop {
            match udp_socket.recv_from(&mut buffer) {
                Ok((len, addr)) => {
                    if addr != client.server_addr() {
                        // Ignore packets that are not from the server
                        continue;
                    }
                    // println!("Received decrypted message {:?} from server {}", &buffer[..len], addr);
                    if let Some(payload) = client.process_packet(&mut buffer[..len]) {
                        let text = String::from_utf8(payload.to_vec()).unwrap();
                        println!("Received message from server: {}", text);
                    }
                }
                Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => break,
                Err(e) => panic!("Socket error: {}", e),
            };
        }

        if let Some((packet, addr)) = client.update(Instant::now() - last_updated) {
            udp_socket.send_to(packet, addr).unwrap();
        }
        last_updated = Instant::now();
        thread::sleep(Duration::from_millis(50));
    }
}

pub fn generate_payload_packet( &mut self, payload: &[u8], ) -> Result<(SocketAddr, &mut [u8]), NetcodeError>

Returns the server address and an encrypted payload packet that can be sent to the server.

Examples found in repository

examples/echo.rs (line 187)

fn client(authentication: ClientAuthentication) {
    let udp_socket = UdpSocket::bind("127.0.0.1:0").unwrap();
    udp_socket.set_nonblocking(true).unwrap();
    let now = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
    let mut client = NetcodeClient::new(now, authentication).unwrap();
    let stdin_channel = spawn_stdin_channel();
    let mut buffer = [0u8; NETCODE_MAX_PACKET_BYTES];

    let mut last_updated = Instant::now();
    loop {
        if let Some(err) = client.disconnect_reason() {
            panic!("Client error: {:?}", err);
        }

        match stdin_channel.try_recv() {
            Ok(text) => {
                if client.is_connected() {
                    let (addr, payload) = client.generate_payload_packet(text.as_bytes()).unwrap();
                    udp_socket.send_to(payload, addr).unwrap();
                } else {
                    println!("Client is not yet connected");
                }
            }
            Err(TryRecvError::Empty) => {}
            Err(TryRecvError::Disconnected) => panic!("Stdin channel disconnected"),
        }

        loop {
            match udp_socket.recv_from(&mut buffer) {
                Ok((len, addr)) => {
                    if addr != client.server_addr() {
                        // Ignore packets that are not from the server
                        continue;
                    }
                    // println!("Received decrypted message {:?} from server {}", &buffer[..len], addr);
                    if let Some(payload) = client.process_packet(&mut buffer[..len]) {
                        let text = String::from_utf8(payload.to_vec()).unwrap();
                        println!("Received message from server: {}", text);
                    }
                }
                Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => break,
                Err(e) => panic!("Socket error: {}", e),
            };
        }

        if let Some((packet, addr)) = client.update(Instant::now() - last_updated) {
            udp_socket.send_to(packet, addr).unwrap();
        }
        last_updated = Instant::now();
        thread::sleep(Duration::from_millis(50));
    }
}

pub fn update(&mut self, duration: Duration) -> Option<(&mut [u8], SocketAddr)>

Update the internal state of the client, receives the duration since last updated. Might return the serve address and a protocol packet to be sent to the server.

Examples found in repository

examples/echo.rs (line 215)

fn client(authentication: ClientAuthentication) {
    let udp_socket = UdpSocket::bind("127.0.0.1:0").unwrap();
    udp_socket.set_nonblocking(true).unwrap();
    let now = SystemTime::now().duration_since(UNIX_EPOCH).unwrap();
    let mut client = NetcodeClient::new(now, authentication).unwrap();
    let stdin_channel = spawn_stdin_channel();
    let mut buffer = [0u8; NETCODE_MAX_PACKET_BYTES];

    let mut last_updated = Instant::now();
    loop {
        if let Some(err) = client.disconnect_reason() {
            panic!("Client error: {:?}", err);
        }

        match stdin_channel.try_recv() {
            Ok(text) => {
                if client.is_connected() {
                    let (addr, payload) = client.generate_payload_packet(text.as_bytes()).unwrap();
                    udp_socket.send_to(payload, addr).unwrap();
                } else {
                    println!("Client is not yet connected");
                }
            }
            Err(TryRecvError::Empty) => {}
            Err(TryRecvError::Disconnected) => panic!("Stdin channel disconnected"),
        }

        loop {
            match udp_socket.recv_from(&mut buffer) {
                Ok((len, addr)) => {
                    if addr != client.server_addr() {
                        // Ignore packets that are not from the server
                        continue;
                    }
                    // println!("Received decrypted message {:?} from server {}", &buffer[..len], addr);
                    if let Some(payload) = client.process_packet(&mut buffer[..len]) {
                        let text = String::from_utf8(payload.to_vec()).unwrap();
                        println!("Received message from server: {}", text);
                    }
                }
                Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => break,
                Err(e) => panic!("Socket error: {}", e),
            };
        }

        if let Some((packet, addr)) = client.update(Instant::now() - last_updated) {
            udp_socket.send_to(packet, addr).unwrap();
        }
        last_updated = Instant::now();
        thread::sleep(Duration::from_millis(50));
    }
}

Trait Implementations

impl Debug for NetcodeClient

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.