use crate::codec::*;
use crate::endpoint::Endpoint;
use crate::error::ZmqResult;
use crate::message::*;
use crate::transport::AcceptStopHandle;
use crate::util::PeerIdentity;
use crate::{async_rt, CaptureSocket, SocketOptions};
use crate::{
MultiPeerBackend, Socket, SocketBackend, SocketEvent, SocketSend, SocketType, ZmqError,
};
use async_trait::async_trait;
use dashmap::DashMap;
use futures::channel::{mpsc, oneshot};
use futures::FutureExt;
use parking_lot::Mutex;
use std::collections::HashMap;
use std::io::ErrorKind;
use std::pin::Pin;
use std::sync::Arc;
pub(crate) struct Subscriber {
pub(crate) subscriptions: Vec<Vec<u8>>,
pub(crate) send_queue: Pin<Box<ZmqFramedWrite>>,
_subscription_coro_stop: oneshot::Sender<()>,
}
pub(crate) struct PubSocketBackend {
subscribers: DashMap<PeerIdentity, Subscriber>,
socket_monitor: Mutex<Option<mpsc::Sender<SocketEvent>>>,
socket_options: SocketOptions,
}
impl PubSocketBackend {
fn message_received(&self, peer_id: &PeerIdentity, message: Message) {
let message = match message {
Message::Message(m) => m,
_ => return,
};
assert_eq!(message.len(), 1);
let data: Vec<u8> = message.into_vec().pop().unwrap().to_vec();
if data.is_empty() {
return;
}
match data[0] {
1 => {
self.subscribers
.get_mut(peer_id)
.unwrap()
.subscriptions
.push(Vec::from(&data[1..]));
}
0 => {
let mut del_index = None;
let sub = Vec::from(&data[1..]);
for (idx, subscription) in self
.subscribers
.get(peer_id)
.unwrap()
.subscriptions
.iter()
.enumerate()
{
if &sub == subscription {
del_index = Some(idx);
break;
}
}
if let Some(index) = del_index {
self.subscribers
.get_mut(peer_id)
.unwrap()
.subscriptions
.remove(index);
}
}
_ => (),
}
}
}
impl SocketBackend for PubSocketBackend {
fn socket_type(&self) -> SocketType {
SocketType::PUB
}
fn socket_options(&self) -> &SocketOptions {
&self.socket_options
}
fn shutdown(&self) {
self.subscribers.clear();
}
fn monitor(&self) -> &Mutex<Option<mpsc::Sender<SocketEvent>>> {
&self.socket_monitor
}
}
#[async_trait]
impl MultiPeerBackend for PubSocketBackend {
async fn peer_connected(self: Arc<Self>, peer_id: &PeerIdentity, io: FramedIo) {
let (mut recv_queue, send_queue) = io.into_parts();
let (sender, stop_receiver) = oneshot::channel();
self.subscribers.insert(
peer_id.clone(),
Subscriber {
subscriptions: vec![],
send_queue: Box::pin(send_queue),
_subscription_coro_stop: sender,
},
);
let backend = self;
let peer_id = peer_id.clone();
async_rt::task::spawn(async move {
use futures::StreamExt;
let mut stop_receiver = stop_receiver.fuse();
loop {
futures::select! {
_ = stop_receiver => {
break;
},
message = recv_queue.next().fuse() => {
match message {
Some(Ok(m)) => backend.message_received(&peer_id, m),
Some(Err(e)) => {
dbg!(e);
backend.peer_disconnected(&peer_id);
break;
}
None => {
backend.peer_disconnected(&peer_id);
break
}
}
}
}
}
});
}
fn peer_disconnected(&self, peer_id: &PeerIdentity) {
log::info!("Client disconnected {:?}", peer_id);
self.subscribers.remove(peer_id);
}
}
pub struct PubSocket {
pub(crate) backend: Arc<PubSocketBackend>,
binds: HashMap<Endpoint, AcceptStopHandle>,
}
impl Drop for PubSocket {
fn drop(&mut self) {
self.backend.shutdown();
}
}
#[async_trait]
impl SocketSend for PubSocket {
async fn send(&mut self, message: ZmqMessage) -> ZmqResult<()> {
let mut dead_peers = Vec::new();
for mut subscriber in self.backend.subscribers.iter_mut() {
for sub_filter in &subscriber.subscriptions {
if sub_filter.len() <= message.get(0).unwrap().len()
&& sub_filter.as_slice() == &message.get(0).unwrap()[0..sub_filter.len()]
{
let res = subscriber
.send_queue
.as_mut()
.try_send(Message::Message(message.clone()));
match res {
Ok(()) => {}
Err(ZmqError::Codec(CodecError::Io(e))) => {
if e.kind() == ErrorKind::BrokenPipe {
dead_peers.push(subscriber.key().clone());
} else {
dbg!(e);
}
}
Err(ZmqError::BufferFull(_)) => {
}
Err(e) => {
dbg!(e);
todo!()
}
}
break;
}
}
}
for peer in dead_peers {
self.backend.peer_disconnected(&peer);
}
Ok(())
}
}
impl CaptureSocket for PubSocket {}
#[async_trait]
impl Socket for PubSocket {
fn with_options(options: SocketOptions) -> Self {
Self {
backend: Arc::new(PubSocketBackend {
subscribers: DashMap::new(),
socket_monitor: Mutex::new(None),
socket_options: options,
}),
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
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::util::tests::{
test_bind_to_any_port_helper, test_bind_to_unspecified_interface_helper,
};
use crate::ZmqResult;
use std::net::IpAddr;
#[async_rt::test]
async fn test_bind_to_any_port() -> ZmqResult<()> {
let s = PubSocket::new();
test_bind_to_any_port_helper(s).await
}
#[async_rt::test]
async fn test_bind_to_any_ipv4_interface() -> ZmqResult<()> {
let any_ipv4: IpAddr = "0.0.0.0".parse().unwrap();
let s = PubSocket::new();
test_bind_to_unspecified_interface_helper(any_ipv4, s, 4000).await
}
#[async_rt::test]
async fn test_bind_to_any_ipv6_interface() -> ZmqResult<()> {
let any_ipv6: IpAddr = "::".parse().unwrap();
let s = PubSocket::new();
test_bind_to_unspecified_interface_helper(any_ipv6, s, 4010).await
}
}