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use std::{pin::Pin, task::Poll, sync::Arc, collections::HashMap, net::SocketAddr};
use futures_util::{Future, Stream, task, FutureExt};
use tokio::{net::{TcpListener, ToSocketAddrs}, sync::{RwLock, mpsc, Mutex}, io::AsyncReadExt};
use crate::{network::{Connection, Error, Message, Event}, MPSC_BUFFER_SIZE, packet::Packet, BYTE_BUFFER_SIZE, parser::Parser};
pub struct Server {
nickname: Arc<RwLock<Vec<u8>>>,
connections: Arc<RwLock<HashMap<SocketAddr, Arc<User>>>>,
event_queue_reciever: Arc<Mutex<mpsc::Receiver<Event>>>,
event_queue_sender: mpsc::Sender<Event>,
event_queue_future: Pin<Box<dyn Future<Output = Option<Event>>>>,
}
impl Connection for Server {
fn connect<A, B>(addr: A, nickname: B) -> Pin<Box<dyn Future<Output = Result<Self, Error>> + 'static>>
where A: ToSocketAddrs + 'static, B: Into<Vec<u8>> + 'static, Self: Sized
{
Box::pin(async move {
let nickname = Arc::new(RwLock::new(nickname.into()));
let listener = TcpListener::bind(addr).await?;
let connections = Arc::new(RwLock::new(HashMap::new()));
let (event_queue_sender, event_queue_reciever) = mpsc::channel(MPSC_BUFFER_SIZE);
{
let connections = connections.clone();
let nickname = nickname.clone();
let event_queue_sender = event_queue_sender.clone();
tokio::spawn(async move {
while let Ok((stream, address)) = listener.accept().await {
let (packet_queue_sender, mut packet_queue_reciever) = mpsc::channel(MPSC_BUFFER_SIZE);
let user = Arc::new(User {
nickname: RwLock::new(None),
packet_queue_sender,
});
connections.write().await.insert(address, user.clone());
let (mut stream_read, mut stream_write) = stream.into_split();
let connections = connections.clone();
let nickname = nickname.clone();
let event_queue_sender = event_queue_sender.clone();
tokio::spawn(async move {
while let Some(packet) = packet_queue_reciever.recv().await {
packet.async_write(&mut stream_write).await.unwrap();
}
});
tokio::spawn(async move {
let mut buffer = [0; BYTE_BUFFER_SIZE];
let mut parser = Parser::new();
loop {
let read_bytes = stream_read.read(&mut buffer).await.unwrap();
parser.parse(&buffer[0..read_bytes]).unwrap();
while let Some(packet) = parser.get_packet() {
match packet {
Packet::SetNicknameRequest(ref nickname)
| Packet::ChangeNicknameRequest(ref nickname) => {
*user.nickname.write().await = Some(nickname.clone());
let packet = match packet {
Packet::SetNicknameRequest(nickname) => Packet::SetNickname(nickname),
Packet::ChangeNicknameRequest(nickname) => Packet::ChangeNickname(nickname),
_ => unreachable!(),
};
user.packet_queue_sender.send(packet).await.unwrap();
},
Packet::UserListRequest => {
user.packet_queue_sender.send(Packet::UserListResponse(generate_user_list(&nickname, &connections).await)).await.unwrap();
},
Packet::SendWord { ref sender, ref recipients, .. }
| Packet::SendInstructions { ref sender, ref recipients, .. }
| Packet::SendList { ref sender, ref recipients, .. }
| Packet::SendImage { ref sender, ref recipients, .. }
| Packet::SendObject { ref sender, ref recipients, .. } => {
for recipient in recipients {
if *recipient == *nickname.read().await {
let event = match &packet {
Packet::SendWord { word, .. } => Event::RecievedMessage { sender: sender.clone(), message: Message::Word(word.clone()) },
Packet::SendInstructions { instructions, .. } => Event::RecievedMessage { sender: sender.clone(), message: Message::Instructions(instructions.clone()) },
Packet::SendList { list, .. } => Event::RecievedMessage { sender: sender.clone(), message: Message::List(list.clone()) },
Packet::SendImage { bytes, .. } => Event::RecievedMessage { sender: sender.clone(), message: Message::Image(bytes.clone()) },
Packet::SendObject { bytes, .. } => Event::RecievedMessage { sender: sender.clone(), message: Message::Object(bytes.clone()) },
_ => unreachable!(),
};
event_queue_sender.send(event).await.unwrap();
} else {
for (_, user) in &*connections.read().await {
if user.nickname.read().await.as_ref().map_or(false, |nickname| nickname == recipient) {
let packet = match &packet {
Packet::SendWord { word, .. } => Packet::DeliverWord { sender: sender.clone(), word: word.clone() },
Packet::SendInstructions { instructions, .. } => Packet::DeliverInstructions { sender: sender.clone(), instructions: instructions.clone() },
Packet::SendList { list, .. } => Packet::DeliverList { sender: sender.clone(), list: list.clone() },
Packet::SendImage { bytes, .. } => Packet::DeliverImage { sender: sender.clone(), bytes: bytes.clone() },
Packet::SendObject { bytes, .. } => Packet::DeliverObject { sender: sender.clone(), bytes: bytes.clone() },
_ => unreachable!(),
};
user.packet_queue_sender.send(packet).await.unwrap();
}
}
}
}
},
_ => (),
}
}
}
});
}
});
}
let event_queue_reciever = Arc::new(Mutex::new(event_queue_reciever));
let event_queue_future = {
let event_queue_reciever = event_queue_reciever.clone();
Box::pin(async move {
event_queue_reciever.lock().await.recv().await
})
};
Ok(Self {
nickname,
connections,
event_queue_sender,
event_queue_reciever,
event_queue_future,
})
})
}
fn send<B>(&mut self, message: Message, recipients: Vec<B>) -> Pin<Box<dyn Future<Output = Result<(), Error>> + '_>>
where B: Into<Vec<u8>>, B: 'static
{
Box::pin(async move {
for recipient in recipients {
let recipient: Vec<u8> = recipient.into();
let nickname = self.nickname.read().await;
if recipient == *nickname {
let nickname = nickname.clone();
let event = match &message {
Message::Word(word) => Event::RecievedMessage { sender: nickname, message: Message::Word(word.clone()) },
Message::Instructions(instructions) => Event::RecievedMessage { sender: nickname, message: Message::Instructions(instructions.clone()) },
Message::List(list) => Event::RecievedMessage { sender: nickname, message: Message::List(list.clone()) },
Message::Image(bytes) => Event::RecievedMessage { sender: nickname, message: Message::Image(bytes.clone()) },
Message::Object(bytes) => Event::RecievedMessage { sender: nickname, message: Message::Object(bytes.clone()) },
};
self.event_queue_sender.send(event).await.unwrap();
} else {
for (_, user) in &*self.connections.read().await {
if user.nickname.read().await.as_ref().map_or(false, |nickname| *nickname == recipient) {
let nickname = nickname.clone();
let packet = match &message {
Message::Word(word) => Packet::DeliverWord { sender: nickname, word: word.clone() },
Message::Instructions(instructions) => Packet::DeliverInstructions { sender: nickname, instructions: instructions.clone() },
Message::List(list) => Packet::DeliverList { sender: nickname, list: list.clone() },
Message::Image(bytes) => Packet::DeliverImage { sender: nickname, bytes: bytes.clone() },
Message::Object(bytes) => Packet::DeliverObject { sender: nickname, bytes: bytes.clone() },
};
user.packet_queue_sender.send(packet).await.unwrap();
}
}
}
}
Ok(())
})
}
fn user_list(&mut self) -> Pin<Box<dyn Future<Output = Result<Vec<Vec<u8>>, Error>> + '_>> {
Box::pin(async move {
Ok(generate_user_list(&self.nickname, &self.connections).await)
})
}
fn change_nickname<B>(&mut self, _nickname: B) -> Pin<Box<dyn Future<Output = Result<(), Error>> + '_>>
where B: Into<Vec<u8>>, B: 'static
{
Box::pin(async move {
todo!();
})
}
}
impl Stream for Server {
type Item = Result<Event, Error>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<Option<Self::Item>> {
match self.event_queue_future.poll_unpin(cx) {
Poll::Ready(Some(event)) => {
self.event_queue_future = {
let event_queue_reciever = self.event_queue_reciever.clone();
Box::pin(async move {
event_queue_reciever.lock().await.recv().await
})
};
Poll::Ready(Some(Ok(event)))
},
Poll::Ready(None) => Poll::Ready(None),
Poll::Pending => Poll::Pending,
}
}
}
struct User {
nickname: RwLock<Option<Vec<u8>>>,
packet_queue_sender: mpsc::Sender<Packet>,
}
async fn generate_user_list(nickname: &RwLock<Vec<u8>>, connections: &RwLock<HashMap<SocketAddr, Arc<User>>>) -> Vec<Vec<u8>> {
let mut user_list = vec![nickname.read().await.clone()];
for (_, user) in &*connections.read().await {
if let Some(nickname) = &*user.nickname.read().await {
user_list.push(nickname.clone());
}
}
user_list
}
