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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| use crate::{error::Result, message::Message, subscribe::recv_internal, DATA_MAX_LEN}; | ||
| use async_zmq::{subscribe, Stream, StreamExt, Subscribe}; | ||
| use core::{ | ||
| pin::Pin, | ||
| task::{Context as AsyncContext, Poll}, | ||
| }; | ||
| use futures_util::stream::Fuse; | ||
| use zmq::Context as ZmqContext; | ||
|
|
||
| /// Stream that asynchronously produces [`Message`]s using a ZMQ subscriber. | ||
| pub struct MessageStream { | ||
| zmq_stream: Subscribe, | ||
| data_cache: Box<[u8; DATA_MAX_LEN]>, | ||
| } | ||
|
|
||
| impl MessageStream { | ||
| fn new(zmq_stream: Subscribe) -> Self { | ||
| Self { | ||
| zmq_stream, | ||
| data_cache: vec![0; DATA_MAX_LEN].into_boxed_slice().try_into().unwrap(), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl Stream for MessageStream { | ||
| type Item = Result<Message>; | ||
|
|
||
| fn poll_next(mut self: Pin<&mut Self>, cx: &mut AsyncContext<'_>) -> Poll<Option<Self::Item>> { | ||
| self.as_mut().zmq_stream.poll_next_unpin(cx).map(|opt| { | ||
| opt.map(|res| match res { | ||
| Ok(mp) => recv_internal(mp.iter(), &mut self.data_cache), | ||
| Err(err) => Err(err.into()), | ||
| }) | ||
| }) | ||
| } | ||
| } | ||
|
|
||
| /// Stream that asynchronously produces [`Message`]s using multiple ZMQ subscriber. | ||
| pub struct MultiMessageStream { | ||
| streams: Vec<Fuse<MessageStream>>, | ||
| next: usize, | ||
| } | ||
|
|
||
| impl MultiMessageStream { | ||
| fn new(buf_capacity: usize) -> Self { | ||
| Self { | ||
| streams: Vec::with_capacity(buf_capacity), | ||
| next: 0, | ||
| } | ||
| } | ||
|
|
||
| fn push(&mut self, stream: Subscribe) { | ||
| // Not sure if fuse is needed, but has to prevent use of closed streams. | ||
| self.streams.push(MessageStream::new(stream).fuse()); | ||
| } | ||
| } | ||
|
|
||
| impl Stream for MultiMessageStream { | ||
| type Item = Result<Message>; | ||
|
|
||
| fn poll_next(mut self: Pin<&mut Self>, cx: &mut AsyncContext<'_>) -> Poll<Option<Self::Item>> { | ||
| let mut any_pending = false; | ||
|
|
||
| let mut index_iter = (self.next..self.streams.len()).chain(0..self.next); | ||
| while let Some(i) = index_iter.next() { | ||
| match self.as_mut().streams[i].poll_next_unpin(cx) { | ||
| msg @ Poll::Ready(Some(_)) => { | ||
| if let Some(next) = index_iter.next() { | ||
| self.next = next; | ||
| } | ||
| return msg; | ||
| } | ||
| Poll::Ready(None) => { | ||
| // continue | ||
| } | ||
| Poll::Pending => { | ||
| any_pending = true; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if any_pending { | ||
| Poll::Pending | ||
| } else { | ||
| Poll::Ready(None) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pub fn subscribe_multi_async(endpoints: &[&str]) -> Result<MultiMessageStream> { | ||
| let context = ZmqContext::new(); | ||
| let mut res = MultiMessageStream::new(endpoints.len()); | ||
|
|
||
| for endpoint in endpoints { | ||
| let socket = new_socket_internal(&context, endpoint)?; | ||
| res.push(socket); | ||
| } | ||
|
|
||
| Ok(res) | ||
| } | ||
|
|
||
| pub fn subscribe_async(endpoint: &str) -> Result<MessageStream> { | ||
| Ok(MessageStream::new(new_socket_internal( | ||
| &ZmqContext::new(), | ||
| endpoint, | ||
| )?)) | ||
| } | ||
|
|
||
| fn new_socket_internal(context: &ZmqContext, endpoint: &str) -> Result<Subscribe> { | ||
| let socket = subscribe(endpoint)?.with_context(context).connect()?; | ||
| socket.set_subscribe("")?; | ||
|
|
||
| Ok(socket) | ||
| } |