mpc_client/client.rs
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#[doc(hidden)]
macro_rules! client_impl {
() => {
/// Relay a buffer to a peer over the noise protocol channel.
///
/// The peers must have already performed the noise protocol
/// handshake.
async fn relay(
&mut self,
public_key: impl AsRef<[u8]>,
payload: &[u8],
encoding: Encoding,
broadcast: bool,
session_id: Option<SessionId>,
) -> Result<()> {
let mut peers = self.peers.write().await;
if let Some(peer) = peers.get_mut(public_key.as_ref()) {
let request = encrypt_peer_channel(
public_key, peer, payload, encoding, broadcast,
session_id,
)
.await?;
self.outbound_tx
.send(InternalMessage::Request(request))?;
Ok(())
} else {
Err(Error::PeerNotFound(hex::encode(
public_key.as_ref().to_vec(),
)))
}
}
/// Encrypt a request message and send over the encrypted
/// server channel.
async fn request(
&mut self,
message: ServerMessage,
) -> Result<()> {
let envelope = {
let mut server = self.server.write().await;
if let Some(server) = server.as_mut() {
let payload = encode(&message).await?;
let inner = encrypt_server_channel(
server, &payload, false,
)
.await?;
Some(inner)
} else {
None
}
};
if let Some(envelope) = envelope {
let request = RequestMessage::Opaque(
OpaqueMessage::ServerMessage(envelope),
);
self.outbound_tx
.send(InternalMessage::Request(request))?;
Ok(())
} else {
unreachable!()
}
}
};
}
#[doc(hidden)]
macro_rules! client_transport_impl {
($kind:ty) => {
#[async_trait::async_trait]
impl crate::NetworkTransport for $kind {
/// The public key for this client.
fn public_key(&self) -> &[u8] {
self.options.keypair.public_key()
}
/// Perform initial handshake with the server.
async fn connect(&mut self) -> Result<()> {
let request = {
let mut state = self.server.write().await;
let (len, payload) = match &mut *state {
Some(ProtocolState::Handshake(initiator)) => {
let mut request = vec![0u8; 1024];
let len =
initiator.write_message(&[], &mut request)?;
(len, request)
}
_ => return Err(Error::NotHandshakeState),
};
RequestMessage::Transparent(
TransparentMessage::ServerHandshake(
HandshakeMessage::Initiator(len, payload),
),
)
};
self.outbound_tx.send(InternalMessage::Request(request))?;
Ok(())
}
async fn is_connected(&self) -> bool {
let state = self.server.read().await;
matches!(&*state, Some(ProtocolState::Transport(_)))
}
/// Handshake with a peer.
///
/// Peer already exists error is returned if this
/// client is already connecting to the peer.
async fn connect_peer(
&mut self,
public_key: &[u8],
) -> Result<()> {
let mut peers = self.peers.write().await;
if peers.get(public_key.as_ref()).is_some() {
return Err(Error::PeerAlreadyExists);
//return Ok(())
}
tracing::debug!(
to = ?hex::encode(public_key.as_ref()),
"peer handshake initiator"
);
let builder = Builder::new(self.options.params()?);
let handshake = builder
.local_private_key(self.options.keypair.private_key())
.remote_public_key(public_key.as_ref())
.build_initiator()?;
let peer_state =
ProtocolState::Handshake(Box::new(handshake));
let state = peers
.entry(public_key.as_ref().to_vec())
.or_insert(peer_state);
let (len, payload) = match state {
ProtocolState::Handshake(initiator) => {
let mut request = vec![0u8; 1024];
let len =
initiator.write_message(&[], &mut request)?;
(len, request)
}
_ => return Err(Error::NotHandshakeState),
};
drop(peers);
let request = RequestMessage::Transparent(
TransparentMessage::PeerHandshake {
public_key: public_key.as_ref().to_vec(),
message: HandshakeMessage::Initiator(len, payload),
},
);
self.outbound_tx.send(InternalMessage::Request(request))?;
Ok(())
}
/// Send a JSON message to a peer via the relay service.
async fn send_json<S>(
&mut self,
public_key: &[u8],
payload: &S,
session_id: Option<SessionId>,
) -> Result<()>
where
S: Serialize + Send + Sync,
{
self.relay(
public_key,
&JsonMessage::serialize(payload)?,
Encoding::Json,
false,
session_id,
)
.await
}
/// Send a binary message to a peer via the relay service.
async fn send_blob(
&mut self,
public_key: &[u8],
payload: Vec<u8>,
session_id: Option<SessionId>,
) -> Result<()> {
self.relay(
public_key,
&payload,
Encoding::Blob,
false,
session_id,
)
.await
}
/// Create a new meeting point.
async fn new_meeting(
&mut self,
owner_id: UserId,
slots: HashSet<UserId>,
data: Value,
) -> Result<()> {
let message = ServerMessage::NewMeeting { owner_id, slots, data };
self.request(message).await
}
/// Join a meeting point.
async fn join_meeting(
&mut self,
meeting_id: MeetingId,
user_id: UserId,
) -> Result<()> {
let message = ServerMessage::JoinMeeting(meeting_id, user_id);
self.request(message).await
}
/// Create a new session.
async fn new_session(
&mut self,
participant_keys: Vec<Vec<u8>>,
) -> Result<()> {
let session = SessionRequest { participant_keys };
let message = ServerMessage::NewSession(session);
self.request(message).await
}
/// Register a peer connection in a session.
async fn register_connection(
&mut self,
session_id: &SessionId,
peer_key: &[u8],
) -> Result<()> {
let message = ServerMessage::SessionConnection {
session_id: *session_id,
peer_key: peer_key.to_vec(),
};
self.request(message).await
}
/// Close a session.
async fn close_session(
&mut self,
session_id: SessionId,
) -> Result<()> {
let message = ServerMessage::CloseSession(session_id);
self.request(message).await
}
#[cfg(not(target_arch="wasm32"))]
async fn close(&self) -> Result<()> {
self.outbound_tx.send(InternalMessage::Close)?;
Ok(())
}
#[cfg(target_arch="wasm32")]
async fn close(&self) -> Result<()> {
// Remove event listener closures
self.ws.set_onopen(None);
self.ws.set_onmessage(None);
self.ws.set_onerror(None);
// Close the socket connection
self.ws.close()?;
// Must also dispatch the close event for the driver
self.outbound_tx.send(InternalMessage::Close)?;
Ok(())
}
}
}
}
pub(crate) use client_impl;
pub(crate) use client_transport_impl;