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use affinidi_did_resolver_cache_sdk::{
DIDCacheClient,
networking::{WSRequest, WSResponse, WSResponseError, WSResponseType},
};
use axum::{
extract::{
State, WebSocketUpgrade,
ws::{Message, WebSocket},
},
response::IntoResponse,
};
use tokio::select;
use tracing::{Instrument, debug, info, span, warn};
use crate::SharedData;
// Handles the switching of the protocol to a websocket connection
pub async fn websocket_handler(
//session: Session,
ws: WebSocketUpgrade,
State(state): State<SharedData>,
) -> impl IntoResponse {
let _span = span!(
tracing::Level::DEBUG,
"websocket_handler",
// session = session.session_id
);
/*async move { ws.on_upgrade(move |socket| handle_socket(socket, state, session)) }
.instrument(_span)
.await*/
async move { ws.on_upgrade(move |socket| handle_socket(socket, state)) }
.instrument(_span)
.await
}
/// WebSocket state machine. This is spawned per connection.
//async fn handle_socket(mut socket: WebSocket, state: SharedData, session: Session) {
async fn handle_socket(mut socket: WebSocket, state: SharedData) {
let _span = span!(
tracing::Level::DEBUG,
"handle_socket",
//session = session.session_id
);
async move {
state.stats().await.increment_ws_opened();
info!("Websocket connection established");
loop {
select! {
value = socket.recv() => {
if let Some(msg) = value {
match msg {
Ok(msg) => {
match msg {
Message::Text(msg) => {
debug!("ws: Received text message: {:?}", msg);
let request: WSRequest = match serde_json::from_str(&msg) {
Ok(request) => request,
Err(e) => {
warn!("ws: Error parsing message: {:?}", e);
break;
}
};
match state.resolver.resolve(&request.did).await {
Ok(response) => {
let message = WSResponseType::Response(Box::new(WSResponse {
did: response.did.clone(),
hash: response.did_hash,
document: response.doc,
}));
let mut stats = state.stats().await;
stats.increment_resolver_success();
if response.cache_hit { stats.increment_cache_hit();}
stats.increment_did_method_success(response.method);
drop(stats);
debug!("resolved DID: ({}) cache_hit?({})", response.did, response.cache_hit);
if let Err(e) = socket.send(Message::Text(serde_json::to_string(&message).unwrap().into())).await {
warn!("ws: Error sending response: {:?}", e);
break;
} else {
debug!("Sent response: {:?}", message);
}
}
Err(e) => {
// Couldn't resolve the DID, send an error back
let hash = DIDCacheClient::hash_did(&request.did);
warn!("Couldn't resolve DID: ({}) Reason: {}", &request.did, e);
state.stats().await.increment_resolver_error();
if let Err(e) = socket.send(Message::Text(serde_json::to_string(&WSResponseType::Error(WSResponseError {did: request.did, hash, error: e.to_string()})).unwrap().into())).await {
warn!("ws: Error sending error response: {:?}", e);
break;
}
}
}
}
Message::Binary(msg) => {
debug!("ws: Received binary message: {:?}", msg);
let request: WSRequest = match serde_json::from_slice(msg.as_ref()) {
Ok(request) => request,
Err(e) => {
warn!("ws: Error parsing message: {:?}", e);
break;
}
};
match state.resolver.resolve(&request.did).await {
Ok(response) => {
let message = WSResponseType::Response(Box::new(WSResponse {
did: response.did.clone(),
hash: response.did_hash,
document: response.doc,
}));
let mut stats = state.stats().await;
stats.increment_resolver_success();
if response.cache_hit { stats.increment_cache_hit();}
stats.increment_did_method_success(response.method);
drop(stats);
debug!("resolved DID: ({}) cache_hit?({})", response.did, response.cache_hit);
if let Err(e) = socket.send(Message::Text(serde_json::to_string(&message).unwrap().into())).await {
warn!("ws: Error sending response: {:?}", e);
break;
} else {
debug!("Sent response: {:?}", message);
}
}
Err(e) => {
// Couldn't resolve the DID, send an error back
let hash = DIDCacheClient::hash_did(&request.did);
warn!("Couldn't resolve DID: ({}) Reason: {}", &request.did, e);
state.stats().await.increment_resolver_error();
if let Err(e) = socket.send(Message::Text(serde_json::to_string(&WSResponseType::Error(WSResponseError {did: request.did, hash, error: e.to_string()})).unwrap().into())).await {
warn!("ws: Error sending error response: {:?}", e);
break;
}
}
}
}
Message::Ping(_) => {
// Don't need to do anything, the library will automatically respond with a pong
}
Message::Pong(_) => {
// Don't need to do anything
}
Message::Close(_) => {
debug!("Received close message, closing connection");
break;
}
}
}
Err(err) => {
warn!("Error receiving message: {:?}", err);
continue;
}
}
} else {
debug!("Received None, closing connection");
break;
}
}
}
}
// We're done, close the connection
state.stats().await.increment_ws_closed();
info!("Websocket connection closed");
}
.instrument(_span)
.await
}