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use axum::{
extract::{ws::{WebSocketUpgrade, WebSocket, Message}, State},
response::Response,
};
use futures::{sink::SinkExt, stream::StreamExt};
use serde::{Deserialize, Serialize};
use super::state::AppState;
use crate::types::OHLC;
use tracing::{debug, error, info};
#[derive(Debug, Serialize, Deserialize)]
#[serde(tag = "type", content = "payload")]
pub enum WsMessage {
Subscribe {
symbol: String,
#[serde(default = "default_interval")]
interval: u64,
},
Unsubscribe { symbol: String },
Configure { symbol: String, config: serde_json::Value },
Ping,
Pong,
}
#[derive(Debug, Serialize)]
#[serde(tag = "type", content = "data")]
pub enum WsResponse {
MarketData {
symbol: String,
ohlc: OHLC,
timestamp: chrono::DateTime<chrono::Utc>,
},
Subscribed {
symbol: String,
interval: u64,
},
Unsubscribed {
symbol: String,
},
Error {
message: String,
},
Pong,
Welcome {
version: String,
capabilities: Vec<String>,
},
}
fn default_interval() -> u64 {
1000
}
pub async fn websocket_handler(
ws: WebSocketUpgrade,
State(state): State<AppState>,
) -> Response {
ws.on_upgrade(|socket| handle_socket(socket, state))
}
async fn handle_socket(socket: WebSocket, state: AppState) {
let (mut sender, mut receiver) = socket.split();
let welcome = WsResponse::Welcome {
version: "1.0.0".to_string(),
capabilities: vec![
"subscribe".to_string(),
"unsubscribe".to_string(),
"configure".to_string(),
"streaming".to_string(),
],
};
if let Ok(msg) = serde_json::to_string(&welcome) {
let _ = sender.send(Message::Text(msg.into())).await;
}
let (tx, mut rx) = tokio::sync::mpsc::unbounded_channel::<String>();
let mut subscriptions: Vec<(String, tokio::task::JoinHandle<()>)> = Vec::new();
loop {
tokio::select! {
// Handle incoming WebSocket messages
msg = receiver.next() => {
match msg {
Some(Ok(Message::Text(text))) => {
match serde_json::from_str::<WsMessage>(&text) {
Ok(ws_msg) => {
match ws_msg {
WsMessage::Subscribe { symbol, interval } => {
info!("WebSocket subscribing to {} with interval {}ms", symbol, interval);
// Cancel existing subscription for this symbol
subscriptions.retain(|(s, handle)| {
if s == &symbol {
handle.abort();
false
} else {
true
}
});
let generator = state.get_or_create_generator(&symbol).await;
let symbol_clone = symbol.clone();
let tx_clone = tx.clone();
let handle = tokio::spawn(async move {
let mut interval_timer = tokio::time::interval(
std::time::Duration::from_millis(interval)
);
loop {
interval_timer.tick().await;
let ohlc = {
let mut generator_lock = generator.write().await;
generator_lock.generate_ohlc()
};
let response = WsResponse::MarketData {
symbol: symbol_clone.clone(),
ohlc,
timestamp: chrono::Utc::now(),
};
if let Ok(msg) = serde_json::to_string(&response) {
if tx_clone.send(msg).is_err() {
break;
}
}
}
});
subscriptions.push((symbol.clone(), handle));
let response = WsResponse::Subscribed { symbol, interval };
if let Ok(msg) = serde_json::to_string(&response) {
let _ = sender.send(Message::Text(msg.into())).await;
}
}
WsMessage::Unsubscribe { symbol } => {
info!("WebSocket unsubscribing from {}", symbol);
subscriptions.retain(|(s, handle)| {
if s == &symbol {
handle.abort();
false
} else {
true
}
});
let response = WsResponse::Unsubscribed { symbol };
if let Ok(msg) = serde_json::to_string(&response) {
let _ = sender.send(Message::Text(msg.into())).await;
}
}
WsMessage::Configure { symbol, config } => {
debug!("Configuring {} with {:?}", symbol, config);
let response = WsResponse::Error {
message: "Configuration not yet implemented".to_string(),
};
if let Ok(msg) = serde_json::to_string(&response) {
let _ = sender.send(Message::Text(msg.into())).await;
}
}
WsMessage::Ping => {
let response = WsResponse::Pong;
if let Ok(msg) = serde_json::to_string(&response) {
let _ = sender.send(Message::Text(msg.into())).await;
}
}
WsMessage::Pong => {}
}
}
Err(e) => {
error!("Failed to parse WebSocket message: {}", e);
let response = WsResponse::Error {
message: format!("Invalid message format: {e}"),
};
if let Ok(msg) = serde_json::to_string(&response) {
let _ = sender.send(Message::Text(msg.into())).await;
}
}
}
}
Some(Ok(Message::Close(_))) | None => {
break;
}
Some(Err(e)) => {
error!("WebSocket error: {}", e);
break;
}
_ => {}
}
}
// Handle outgoing messages from subscriptions
Some(msg) = rx.recv() => {
if sender.send(Message::Text(msg.into())).await.is_err() {
break;
}
}
}
}
// Clean up subscriptions
for (_, handle) in subscriptions {
handle.abort();
}
info!("WebSocket connection closed");
}