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//! MCP WebSocket Handler
//!
//! Handles WebSocket connections and message processing for the MCP server.
use {
super::logging::McpConnectionId,
super::logging::McpDebugLogger,
super::shared::McpProtocolEngine,
anyhow::Result,
futures_util::{SinkExt, StreamExt},
serde_json::{json, Value},
std::sync::Arc,
tracing::{debug, error, info},
warp::{ws::Message, ws::WebSocket, ws::Ws, Filter, Rejection, Reply},
};
/// Main WebSocket handler for MCP connections
pub async fn handle_mcp_ws_main(ws: Ws) -> Result<impl Reply, Rejection> {
// For now, we'll create a new shared handler for each WebSocket connection
// In a more robust implementation, we'd pass this from the server
let protocol_engine = Arc::new(McpProtocolEngine::new());
Ok(ws.on_upgrade(move |websocket| async move {
let connection_id = McpConnectionId::new();
let logger = McpDebugLogger::new(connection_id.clone());
info!(
"🔌 MCP WebSocket connection established: {:?}",
connection_id
);
handle_mcp_ws(websocket, logger, protocol_engine.clone()).await;
info!("🔌 MCP WebSocket connection closed: {:?}", connection_id);
}))
}
/// WebSocket handler that accepts a protocol engine
pub fn create_ws_handler(
protocol_engine: Arc<McpProtocolEngine>,
) -> impl Filter<Extract = impl Reply, Error = Rejection> + Clone {
warp::path!("mcp")
.and(warp::ws())
.and(warp::any().map(move || protocol_engine.clone()))
.and_then(|ws: Ws, engine: Arc<McpProtocolEngine>| async move {
Ok::<_, Rejection>(ws.on_upgrade(move |websocket| async move {
let connection_id = McpConnectionId::new();
let logger = McpDebugLogger::new(connection_id.clone());
info!(
"🔌 MCP WebSocket connection established: {:?}",
connection_id
);
handle_mcp_ws(websocket, logger, engine.clone()).await;
info!("🔌 MCP WebSocket connection closed: {:?}", connection_id);
}))
})
}
/// Handle MCP WebSocket connection
async fn handle_mcp_ws(
websocket: WebSocket,
logger: McpDebugLogger,
protocol_engine: Arc<McpProtocolEngine>,
) {
let (mut ws_sender, mut ws_receiver) = websocket.split();
let session_id = format!("ws-{}", logger.connection_id().0);
info!("{}", logger.fmt_connection_start());
while let Some(msg_result) = ws_receiver.next().await {
match msg_result {
Ok(msg) => {
if msg.is_text() {
let text = msg.to_str().unwrap_or("");
debug!("{}", logger.fmt_message_received("text", text.len()));
debug!("📥 Raw MCP JSON: {}", text);
match serde_json::from_str::<Value>(text) {
Ok(message) => {
match protocol_engine
.handle_message(message.clone(), Some(session_id.clone()))
.await
{
Ok(response) => {
let response_text = match serde_json::to_string(&response) {
Ok(text) => text,
Err(e) => {
error!("Failed to serialize response: {}", e);
continue;
}
};
debug!("📤 Raw MCP Response: {}", response_text);
if let Err(e) =
ws_sender.send(Message::text(&response_text)).await
{
error!("{}", logger.fmt_response_error(&e.to_string()));
break;
}
debug!("{}", logger.fmt_response_sent(response_text.len()));
}
Err(e) => {
error!(
"{}",
logger.fmt_message_handling_error(
"unknown",
&e.to_string(),
std::time::Duration::ZERO
)
);
// Extract the message ID from the original request for proper error response
let message_id =
message.get("id").unwrap_or(&json!(null)).clone();
// Create error response
let error_response = json!({
"jsonrpc": "2.0",
"id": message_id,
"error": {
"code": -32603,
"message": format!("Internal error: {}", e)
}
});
let error_text = match serde_json::to_string(&error_response) {
Ok(text) => text,
Err(e) => {
error!("Failed to serialize error response: {}", e);
break;
}
};
if let Err(e) = ws_sender.send(Message::text(error_text)).await
{
error!("{}", logger.fmt_response_error(&e.to_string()));
break;
}
}
}
}
Err(e) => {
error!("{}", logger.fmt_parse_error(&e.to_string(), text));
let error_response = json!({
"jsonrpc": "2.0",
"id": null,
"error": {
"code": -32700,
"message": format!("Parse error: {}", e)
}
});
let error_text = match serde_json::to_string(&error_response) {
Ok(text) => text,
Err(e) => {
error!("Failed to serialize parse error response: {}", e);
break;
}
};
if let Err(e) = ws_sender.send(Message::text(error_text)).await {
error!("{}", logger.fmt_response_error(&e.to_string()));
break;
}
}
}
} else {
debug!("{}", logger.fmt_message_received("non-text", 0));
}
}
Err(e) => {
error!("{}", logger.fmt_response_error(&e.to_string()));
break;
}
}
}
info!("{}", logger.fmt_connection_closed());
}