use crate::backend::Peer;
use crate::codec::{FramedIo, Message, ZmqFramedRead};
use crate::endpoint::Endpoint;
use crate::error::ZmqResult;
use crate::fair_queue::FairQueue;
use crate::fair_queue::QueueInner;
use crate::message::ZmqMessage;
use crate::transport::AcceptStopHandle;
use crate::util::PeerIdentity;
use crate::{
MultiPeerBackend, Socket, SocketBackend, SocketEvent, SocketOptions, SocketRecv, SocketType,
};
use async_trait::async_trait;
use bytes::{BufMut, BytesMut};
use crossbeam_queue::SegQueue;
use dashmap::DashMap;
use futures_channel::mpsc;
use futures_util::{SinkExt, StreamExt};
use parking_lot::Mutex;
use std::collections::{HashMap, HashSet};
use std::sync::Arc;
pub enum SubBackendMsgType {
UNSUBSCRIBE = 0,
SUBSCRIBE = 1,
}
pub(crate) struct SubSocketBackend {
pub(crate) peers: DashMap<PeerIdentity, Peer>,
fair_queue_inner: Option<Arc<Mutex<QueueInner<ZmqFramedRead, PeerIdentity>>>>,
pub(crate) round_robin: SegQueue<PeerIdentity>,
socket_type: SocketType,
socket_options: SocketOptions,
pub(crate) socket_monitor: Mutex<Option<mpsc::Sender<SocketEvent>>>,
subs: Mutex<HashSet<String>>,
}
impl SubSocketBackend {
pub(crate) fn with_options(
fair_queue_inner: Option<Arc<Mutex<QueueInner<ZmqFramedRead, PeerIdentity>>>>,
socket_type: SocketType,
options: SocketOptions,
) -> Self {
Self {
peers: DashMap::new(),
fair_queue_inner,
round_robin: SegQueue::new(),
socket_type,
socket_options: options,
socket_monitor: Mutex::new(None),
subs: Mutex::new(HashSet::new()),
}
}
pub fn create_subs_message(subscription: &str, msg_type: SubBackendMsgType) -> ZmqMessage {
let mut buf = BytesMut::with_capacity(subscription.len() + 1);
buf.put_u8(msg_type as u8);
buf.extend_from_slice(subscription.as_bytes());
buf.freeze().into()
}
}
impl SocketBackend for SubSocketBackend {
fn socket_type(&self) -> SocketType {
self.socket_type
}
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
}
}
#[async_trait]
impl MultiPeerBackend for SubSocketBackend {
async fn peer_connected(self: Arc<Self>, peer_id: &PeerIdentity, io: FramedIo) {
let (recv_queue, mut send_queue) = io.into_parts();
let subs_msgs: Vec<ZmqMessage> = self
.subs
.lock()
.iter()
.map(|x| SubSocketBackend::create_subs_message(x, SubBackendMsgType::SUBSCRIBE))
.collect();
for message in subs_msgs {
send_queue.send(Message::Message(message)).await.unwrap();
}
self.peers.insert(peer_id.clone(), Peer { send_queue });
self.round_robin.push(peer_id.clone());
match &self.fair_queue_inner {
None => {}
Some(inner) => {
inner.lock().insert(peer_id.clone(), recv_queue);
}
};
}
fn peer_disconnected(&self, peer_id: &PeerIdentity) {
self.peers.remove(peer_id);
}
}
pub struct SubSocket {
backend: Arc<SubSocketBackend>,
fair_queue: FairQueue<ZmqFramedRead, PeerIdentity>,
binds: HashMap<Endpoint, AcceptStopHandle>,
}
impl Drop for SubSocket {
fn drop(&mut self) {
self.backend.shutdown()
}
}
impl SubSocket {
pub async fn subscribe(&mut self, subscription: &str) -> ZmqResult<()> {
self.backend.subs.lock().insert(subscription.to_string());
self.process_subs(subscription, SubBackendMsgType::SUBSCRIBE)
.await
}
pub async fn unsubscribe(&mut self, subscription: &str) -> ZmqResult<()> {
self.backend.subs.lock().remove(subscription);
self.process_subs(subscription, SubBackendMsgType::UNSUBSCRIBE)
.await
}
async fn process_subs(
&mut self,
subscription: &str,
msg_type: SubBackendMsgType,
) -> ZmqResult<()> {
let message: ZmqMessage = SubSocketBackend::create_subs_message(subscription, msg_type);
for mut peer in self.backend.peers.iter_mut() {
peer.send_queue
.send(Message::Message(message.clone()))
.await?;
}
Ok(())
}
}
#[async_trait]
impl Socket for SubSocket {
fn with_options(options: SocketOptions) -> Self {
let fair_queue = FairQueue::new(true);
Self {
backend: Arc::new(SubSocketBackend::with_options(
Some(fair_queue.inner()),
SocketType::SUB,
options,
)),
fair_queue,
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 SocketRecv for SubSocket {
async fn recv(&mut self) -> ZmqResult<ZmqMessage> {
loop {
match self.fair_queue.next().await {
Some((_peer_id, Ok(Message::Message(message)))) => {
return Ok(message);
}
Some((_peer_id, Ok(msg))) => todo!("Unimplemented message: {:?}", msg),
Some((peer_id, Err(_))) => {
self.backend.peer_disconnected(&peer_id);
}
None => todo!(),
}
}
}
}