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use config::{Committee, SharedWorkerCache, Stake, WorkerId};
use crypto::PublicKey;
use futures::stream::{futures_unordered::FuturesUnordered, StreamExt as _};
use network::{CancelOnDropHandler, P2pNetwork, ReliableNetwork};
use tokio::{sync::watch, task::JoinHandle};
use types::{
error::DagError,
metered_channel::{Receiver, Sender},
Batch, ReconfigureNotification, WorkerMessage,
};
#[cfg(test)]
#[path = "tests/quorum_waiter_tests.rs"]
pub mod quorum_waiter_tests;
pub struct QuorumWaiter {
name: PublicKey,
id: WorkerId,
committee: Committee,
worker_cache: SharedWorkerCache,
rx_reconfigure: watch::Receiver<ReconfigureNotification>,
rx_message: Receiver<Batch>,
tx_batch: Sender<Batch>,
network: P2pNetwork,
}
impl QuorumWaiter {
#[must_use]
pub fn spawn(
name: PublicKey,
id: WorkerId,
committee: Committee,
worker_cache: SharedWorkerCache,
rx_reconfigure: watch::Receiver<ReconfigureNotification>,
rx_message: Receiver<Batch>,
tx_batch: Sender<Batch>,
network: P2pNetwork,
) -> JoinHandle<()> {
tokio::spawn(async move {
Self {
name,
id,
committee,
worker_cache,
rx_reconfigure,
rx_message,
tx_batch,
network,
}
.run()
.await;
})
}
async fn waiter(
wait_for: CancelOnDropHandler<anemo::Result<anemo::Response<()>>>,
deliver: Stake,
) -> Stake {
let _ = wait_for.await;
deliver
}
async fn run(&mut self) {
loop {
tokio::select! {
Some(batch) = self.rx_message.recv() => {
let workers: Vec<_> = self
.worker_cache
.load()
.others_workers(&self.name, &self.id)
.into_iter()
.map(|(name, info)| (name, info.name))
.collect();
let (primary_names, worker_names): (Vec<_>, _) = workers.into_iter().unzip();
let message = WorkerMessage::Batch(batch.clone());
let handlers = self.network.broadcast(worker_names, &message).await;
let mut wait_for_quorum: FuturesUnordered<_> = primary_names
.into_iter()
.zip(handlers.into_iter())
.map(|(name, handler)| {
let stake = self.committee.stake(&name);
Self::waiter(handler, stake)
})
.collect();
let threshold = self.committee.quorum_threshold();
let mut total_stake = self.committee.stake(&self.name);
loop {
tokio::select! {
Some(stake) = wait_for_quorum.next() => {
total_stake += stake;
if total_stake >= threshold {
if self.tx_batch.send(batch).await.is_err() {
tracing::debug!("{}", DagError::ShuttingDown);
}
break;
}
}
result = self.rx_reconfigure.changed() => {
result.expect("Committee channel dropped");
let message = self.rx_reconfigure.borrow().clone();
match message {
ReconfigureNotification::NewEpoch(new_committee)
| ReconfigureNotification::UpdateCommittee(new_committee) => {
self.network.cleanup(self.committee.network_diff(&new_committee));
self.committee = new_committee;
tracing::debug!("Dropping batch: committee updated to {}", self.committee);
break; },
ReconfigureNotification::Shutdown => return
}
}
}
}
},
result = self.rx_reconfigure.changed() => {
result.expect("Committee channel dropped");
let message = self.rx_reconfigure.borrow().clone();
match message {
ReconfigureNotification::NewEpoch(new_committee) => {
self.committee = new_committee;
},
ReconfigureNotification::UpdateCommittee(new_committee) => {
self.committee = new_committee;
},
ReconfigureNotification::Shutdown => return
}
tracing::debug!("Committee updated to {}", self.committee);
}
}
}
}
}