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use std::{sync::Arc, time::Duration};
pub use event::{Event, MappedInputData, RawData};
use futures::{
future::{select, Either},
Stream, StreamExt,
};
use futures_timer::Delay;
use self::{
event::SharedMemoryData,
thread::{EventItem, EventStreamThreadHandle},
};
use crate::daemon_connection::DaemonChannel;
use dora_core::{
config::NodeId,
daemon_messages::{
self, DaemonCommunication, DaemonRequest, DataflowId, NodeEvent, Timestamped,
},
message::uhlc,
};
use eyre::{eyre, Context};
mod event;
pub mod merged;
mod thread;
pub struct EventStream {
node_id: NodeId,
receiver: flume::r#async::RecvStream<'static, EventItem>,
_thread_handle: EventStreamThreadHandle,
close_channel: DaemonChannel,
clock: Arc<uhlc::HLC>,
}
impl EventStream {
#[tracing::instrument(level = "trace", skip(clock))]
pub(crate) fn init(
dataflow_id: DataflowId,
node_id: &NodeId,
daemon_communication: &DaemonCommunication,
clock: Arc<uhlc::HLC>,
) -> eyre::Result<Self> {
let channel = match daemon_communication {
DaemonCommunication::Shmem {
daemon_events_region_id,
..
} => unsafe { DaemonChannel::new_shmem(daemon_events_region_id) }.wrap_err_with(
|| format!("failed to create shmem event stream for node `{node_id}`"),
)?,
DaemonCommunication::Tcp { socket_addr } => DaemonChannel::new_tcp(*socket_addr)
.wrap_err_with(|| format!("failed to connect event stream for node `{node_id}`"))?,
};
let close_channel = match daemon_communication {
DaemonCommunication::Shmem {
daemon_events_close_region_id,
..
} => unsafe { DaemonChannel::new_shmem(daemon_events_close_region_id) }.wrap_err_with(
|| format!("failed to create shmem event close channel for node `{node_id}`"),
)?,
DaemonCommunication::Tcp { socket_addr } => DaemonChannel::new_tcp(*socket_addr)
.wrap_err_with(|| {
format!("failed to connect event close channel for node `{node_id}`")
})?,
};
Self::init_on_channel(dataflow_id, node_id, channel, close_channel, clock)
}
pub(crate) fn init_on_channel(
dataflow_id: DataflowId,
node_id: &NodeId,
mut channel: DaemonChannel,
mut close_channel: DaemonChannel,
clock: Arc<uhlc::HLC>,
) -> eyre::Result<Self> {
channel.register(dataflow_id, node_id.clone(), clock.new_timestamp())?;
let reply = channel
.request(&Timestamped {
inner: DaemonRequest::Subscribe,
timestamp: clock.new_timestamp(),
})
.map_err(|e| eyre!(e))
.wrap_err("failed to create subscription with dora-daemon")?;
match reply {
daemon_messages::DaemonReply::Result(Ok(())) => {}
daemon_messages::DaemonReply::Result(Err(err)) => {
eyre::bail!("subscribe failed: {err}")
}
other => eyre::bail!("unexpected subscribe reply: {other:?}"),
}
close_channel.register(dataflow_id, node_id.clone(), clock.new_timestamp())?;
let (tx, rx) = flume::bounded(0);
let thread_handle = thread::init(node_id.clone(), tx, channel, clock.clone())?;
Ok(EventStream {
node_id: node_id.clone(),
receiver: rx.into_stream(),
_thread_handle: thread_handle,
close_channel,
clock,
})
}
/// wait for the next event on the events stream.
pub fn recv(&mut self) -> Option<Event> {
futures::executor::block_on(self.recv_async())
}
/// wait for the next event on the events stream until timeout
pub fn recv_timeout(&mut self, dur: Duration) -> Option<Event> {
futures::executor::block_on(self.recv_async_timeout(dur))
}
pub async fn recv_async(&mut self) -> Option<Event> {
self.receiver.next().await.map(Self::convert_event_item)
}
pub async fn recv_async_timeout(&mut self, dur: Duration) -> Option<Event> {
let next_event = match select(Delay::new(dur), self.receiver.next()).await {
Either::Left((_elapsed, _)) => {
Some(EventItem::TimeoutError(eyre!("Receiver timed out")))
}
Either::Right((event, _)) => event,
};
next_event.map(Self::convert_event_item)
}
fn convert_event_item(item: EventItem) -> Event {
match item {
EventItem::NodeEvent { event, ack_channel } => match event {
NodeEvent::Stop => Event::Stop,
NodeEvent::Reload { operator_id } => Event::Reload { operator_id },
NodeEvent::InputClosed { id } => Event::InputClosed { id },
NodeEvent::Input { id, metadata, data } => {
let data = match data {
None => Ok(None),
Some(daemon_messages::DataMessage::Vec(v)) => Ok(Some(RawData::Vec(v))),
Some(daemon_messages::DataMessage::SharedMemory {
shared_memory_id,
len,
drop_token: _, // handled in `event_stream_loop`
}) => unsafe {
MappedInputData::map(&shared_memory_id, len).map(|data| {
Some(RawData::SharedMemory(SharedMemoryData {
data,
_drop: ack_channel,
}))
})
},
};
let data = data.and_then(|data| {
let raw_data = data.unwrap_or(RawData::Empty);
raw_data
.into_arrow_array(&metadata.type_info)
.map(arrow::array::make_array)
});
match data {
Ok(data) => Event::Input {
id,
metadata,
data: data.into(),
},
Err(err) => Event::Error(format!("{err:?}")),
}
}
NodeEvent::AllInputsClosed => {
let err = eyre!(
"received `AllInputsClosed` event, which should be handled by background task"
);
tracing::error!("{err:?}");
Event::Error(err.wrap_err("internal error").to_string())
}
},
EventItem::FatalError(err) => {
Event::Error(format!("fatal event stream error: {err:?}"))
}
EventItem::TimeoutError(err) => {
Event::Error(format!("Timeout event stream error: {err:?}"))
}
}
}
}
impl Stream for EventStream {
type Item = Event;
fn poll_next(
mut self: std::pin::Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Option<Self::Item>> {
self.receiver
.poll_next_unpin(cx)
.map(|item| item.map(Self::convert_event_item))
}
}
impl Drop for EventStream {
#[tracing::instrument(skip(self), fields(%self.node_id))]
fn drop(&mut self) {
let request = Timestamped {
inner: DaemonRequest::EventStreamDropped,
timestamp: self.clock.new_timestamp(),
};
let result = self
.close_channel
.request(&request)
.map_err(|e| eyre!(e))
.wrap_err("failed to signal event stream closure to dora-daemon")
.and_then(|r| match r {
daemon_messages::DaemonReply::Result(Ok(())) => Ok(()),
daemon_messages::DaemonReply::Result(Err(err)) => {
Err(eyre!("EventStreamClosed failed: {err}"))
}
other => Err(eyre!("unexpected EventStreamClosed reply: {other:?}")),
});
if let Err(err) = result {
tracing::warn!("{err:?}")
}
}
}
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