use crate::codec::*;
use crate::endpoint::Endpoint;
use crate::error::*;
use crate::transport::AcceptStopHandle;
use crate::util::{Peer, PeerIdentity};
use crate::*;
use crate::{SocketType, ZmqResult};
use async_trait::async_trait;
use bytes::Bytes;
use crossbeam_queue::SegQueue;
use dashmap::DashMap;
use futures_util::{SinkExt, StreamExt};
use std::collections::HashMap;
use std::sync::Arc;
struct ReqSocketBackend {
pub(crate) peers: DashMap<PeerIdentity, Peer>,
pub(crate) round_robin: SegQueue<PeerIdentity>,
socket_monitor: Mutex<Option<mpsc::Sender<SocketEvent>>>,
socket_options: SocketOptions,
}
pub struct ReqSocket {
backend: Arc<ReqSocketBackend>,
current_request: Option<PeerIdentity>,
binds: HashMap<Endpoint, AcceptStopHandle>,
}
impl Drop for ReqSocket {
fn drop(&mut self) {
self.backend.shutdown();
}
}
#[async_trait]
impl SocketSend for ReqSocket {
async fn send(&mut self, mut message: ZmqMessage) -> ZmqResult<()> {
if self.current_request.is_some() {
return Err(ZmqError::ReturnToSender {
reason: "Unable to send message. Request already in progress",
message,
});
}
loop {
let next_peer_id = match self.backend.round_robin.pop() {
Some(peer) => peer,
None => {
return Err(ZmqError::ReturnToSender {
reason: "Not connected to peers. Unable to send messages",
message,
})
}
};
match self.backend.peers.get_mut(&next_peer_id) {
Some(mut peer) => {
self.backend.round_robin.push(next_peer_id.clone());
message.push_front(Bytes::new());
peer.send_queue.send(Message::Message(message)).await?;
self.current_request = Some(next_peer_id);
return Ok(());
}
None => continue,
}
}
}
}
#[async_trait]
impl SocketRecv for ReqSocket {
async fn recv(&mut self) -> ZmqResult<ZmqMessage> {
match self.current_request.take() {
Some(peer_id) => {
if let Some(mut peer) = self.backend.peers.get_mut(&peer_id) {
let message = peer.recv_queue.next().await;
match message {
Some(Ok(Message::Message(mut m))) => {
assert!(m.len() > 1);
assert!(m.pop_front().unwrap().is_empty()); Ok(m)
}
Some(Ok(_)) => todo!(),
Some(Err(error)) => Err(error.into()),
None => Err(ZmqError::NoMessage),
}
} else {
Err(ZmqError::Other("Server disconnected"))
}
}
None => Err(ZmqError::Other("Unable to recv. No request in progress")),
}
}
}
#[async_trait]
impl Socket for ReqSocket {
fn with_options(options: SocketOptions) -> Self {
Self {
backend: Arc::new(ReqSocketBackend {
peers: DashMap::new(),
round_robin: SegQueue::new(),
socket_monitor: Mutex::new(None),
socket_options: options,
}),
current_request: None,
binds: HashMap::new(),
}
}
fn backend(&self) -> Arc<dyn MultiPeerBackend> {
self.backend.clone()
}
fn binds(&mut self) -> &mut HashMap<Endpoint, AcceptStopHandle> {
&mut self.binds
}
fn monitor(&mut self) -> mpsc::Receiver<SocketEvent> {
let (sender, receiver) = mpsc::channel(1024);
self.backend.socket_monitor.lock().replace(sender);
receiver
}
}
#[async_trait]
impl MultiPeerBackend for ReqSocketBackend {
async fn peer_connected(self: Arc<Self>, peer_id: &PeerIdentity, io: FramedIo) {
let (recv_queue, send_queue) = io.into_parts();
self.peers.insert(
peer_id.clone(),
Peer {
_identity: peer_id.clone(),
send_queue,
recv_queue,
},
);
self.round_robin.push(peer_id.clone());
}
fn peer_disconnected(&self, peer_id: &PeerIdentity) {
self.peers.remove(peer_id);
}
}
impl SocketBackend for ReqSocketBackend {
fn socket_type(&self) -> SocketType {
SocketType::REQ
}
fn socket_options(&self) -> &SocketOptions {
&self.socket_options
}
fn shutdown(&self) {
self.peers.clear();
}
fn monitor(&self) -> &Mutex<Option<mpsc::Sender<SocketEvent>>> {
&self.socket_monitor
}
}