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use crate::actors::{message_router::RouterMessage, user_session::handlers};
use crate::chat::ChatMessage;
use axum::extract::ws::{Message, WebSocket};
use futures::{SinkExt, StreamExt};
use tokio::sync::{mpsc, oneshot};
use tracing::{debug, error};
pub struct UserSession {
user_id: i32,
socket: WebSocket,
router_sender: mpsc::UnboundedSender<RouterMessage>,
session_receiver: mpsc::Receiver<ChatMessage>,
}
impl UserSession {
pub async fn new(
user_id: i32,
socket: WebSocket,
router_sender: mpsc::UnboundedSender<RouterMessage>,
) -> Result<Self, String> {
const CHANNEL_BUFFER_SIZE: usize = 100;
let (session_sender, session_receiver) = mpsc::channel(CHANNEL_BUFFER_SIZE);
// Register with the message router
let (respond_to, response) = oneshot::channel();
let register_msg = RouterMessage::RegisterUser {
user_id,
sender: session_sender,
respond_to,
};
if router_sender.send(register_msg).is_err() {
return Err("Failed to communicate with message router".to_string());
}
match response.await {
Ok(Ok(())) => {
debug!("User {} registered successfully", user_id);
}
Ok(Err(e)) => {
return Err(e);
}
Err(_) => {
return Err("Router response channel closed".to_string());
}
}
Ok(Self {
user_id,
socket,
router_sender,
session_receiver,
})
}
pub async fn run(self) {
let (mut ws_sender, mut ws_receiver) = self.socket.split();
let user_id = self.user_id;
let router_sender = self.router_sender.clone();
let mut session_receiver = self.session_receiver;
let (ack_sender, mut ack_receiver) = mpsc::channel::<ChatMessage>(100);
// Task to handle outgoing messages (from session to WebSocket)
let user_id_clone = user_id;
let mut send_task = tokio::spawn(async move {
loop {
tokio::select! {
// Handle regular messages from session_receiver
message = session_receiver.recv() => {
match message {
Some(msg) => {
match serde_json::to_string(&msg) {
Ok(json) => {
if ws_sender.send(Message::Text(json.into())).await.is_err() {
debug!(
"WebSocket send failed for user {}, likely disconnected",
user_id_clone
);
break;
}
}
Err(e) => {
error!("Failed to serialize message for {}: {}", user_id_clone, e);
}
}
}
None => break, // Channel closed
}
}
// Handle acknowledgment messages
ack_message = ack_receiver.recv() => {
match ack_message {
Some(msg) => {
match serde_json::to_string(&msg) {
Ok(json) => {
if ws_sender.send(Message::Text(json.into())).await.is_err() {
debug!(
"WebSocket send failed for user {}, likely disconnected",
user_id_clone
);
break;
}
}
Err(e) => {
error!("Failed to serialize ack message for {}: {}", user_id_clone, e);
}
}
}
None => break, // Channel closed
}
}
}
}
});
// Task to handle incoming messages (from WebSocket to router)
let user_id_clone = user_id;
let router_sender_clone = router_sender.clone();
let mut recv_task = tokio::spawn(async move {
while let Some(Ok(Message::Text(text))) = ws_receiver.next().await {
match serde_json::from_str::<ChatMessage>(&text) {
Ok(ChatMessage::DirectMessage {
from,
to,
content,
message_id,
}) => {
if let Err(e) = handlers::handle_direct_message(
user_id_clone,
from,
to,
content,
message_id,
&router_sender_clone,
&ack_sender,
)
.await
{
error!("Failed to handle direct message: {}", e);
}
}
#[cfg(feature = "persistence")]
Ok(ChatMessage::GetPaginatedMessages {
message_id,
conversation_id,
}) => {
let (respond_to, response) = oneshot::channel();
let router_msg = RouterMessage::GetChatHistory {
message_id,
conversation_id,
respond_to,
};
if router_sender_clone.send(router_msg).is_err() {
error!("Failed to send chat history request to router");
} else {
let ack_sender_clone = ack_sender.clone();
tokio::spawn(async move {
match response.await {
Ok(Ok(paginated_response)) => {
let response_msg = ChatMessage::ChatHistoryResponse {
messages: paginated_response.messages,
has_more: paginated_response.has_more,
next_cursor: paginated_response.next_cursor.and_then(
|cursor| uuid::Uuid::parse_str(&cursor).ok(),
),
};
let _ = ack_sender_clone.send(response_msg).await;
}
Ok(Err(e)) => {
error!("Failed to get chat history: {}", e);
}
Err(_) => {
error!("Chat history request timeout");
}
}
});
}
}
Ok(_) => {
// Ignore other message types from clients for now
}
Err(e) => {
error!("Failed to parse message from {}: {}", user_id_clone, e);
}
}
}
});
// Wait for either task to complete
tokio::select! {
_ = &mut send_task => {
debug!("Send task completed for user {}", user_id);
recv_task.abort();
}
_ = &mut recv_task => {
debug!("Receive task completed for user {}", user_id);
send_task.abort();
}
}
// Unregister from router
let unregister_msg = RouterMessage::UnregisterUser { user_id };
let _ = router_sender.send(unregister_msg);
debug!("User session ended for {}", user_id);
}
}