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client/network-gossip: Integrate GossipEngine tasks into Future impl (#4767)

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`GossipEngine` spawns two tasks, one for a periodic tick, one to forward
messages from the network to subscribers. These tasks hold an `Arc` to a
`GossipEngineInner`.

To reduce the amount of shared ownership (locking) this patch integrates
the two tasks into a `Future` implementation on the `GossipEngine`
struct. This `Future` implementation can now be called from a single
owner, e.g. the `finality-grandpa` `NetworkBridge`.

As a side effect this removes the requirement on the `network-gossip`
crate to spawn tasks and thereby removes the requirement on the
`finality-grandpa` crate to spawn any tasks.

This is part of a greater effort to reduce the number of owners of
components within `finality-grandpa`, `network` and `network-gossip` as
well as to reduce the amount of unbounded channels. For details see
d9837d7dd, 5f80929dc and 597c0a6c4.
This commit is contained in:
Max Inden
2020-02-12 13:15:26 +01:00
committed by GitHub
parent 13971fe2a7
commit 3f3910ccaf
9 changed files with 121 additions and 155 deletions
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substrate/client/finality-grandpa/src/communication/mod.rs
+9 -5
View File
@@ -178,7 +178,6 @@ impl<B: BlockT, N: Network<B>> NetworkBridge<B, N> {
service: N,
config: crate::Config,
set_state: crate::environment::SharedVoterSetState<B>,
executor: &impl futures::task::Spawn,
) -> Self {
let (validator, report_stream) = GossipValidator::new(
config,
@@ -186,7 +185,7 @@ impl<B: BlockT, N: Network<B>> NetworkBridge<B, N> {
);
let validator = Arc::new(validator);
let gossip_engine = GossipEngine::new(service.clone(), executor, GRANDPA_ENGINE_ID, validator.clone());
let gossip_engine = GossipEngine::new(service.clone(), GRANDPA_ENGINE_ID, validator.clone());
{
// register all previous votes with the gossip service so that they're
@@ -374,10 +373,9 @@ impl<B: BlockT, N: Network<B>> NetworkBridge<B, N> {
|to, neighbor| self.neighbor_sender.send(to, neighbor),
);
let service = self.gossip_engine.clone();
let topic = global_topic::<B>(set_id.0);
let incoming = incoming_global(
service,
self.gossip_engine.clone(),
topic,
voters,
self.validator.clone(),
@@ -419,7 +417,7 @@ impl<B: BlockT, N: Network<B>> NetworkBridge<B, N> {
impl<B: BlockT, N: Network<B>> Future for NetworkBridge<B, N> {
type Output = Result<(), Error>;
fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
fn poll(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
loop {
match self.neighbor_packet_worker.lock().poll_next_unpin(cx) {
Poll::Ready(Some((to, packet))) => {
@@ -444,6 +442,12 @@ impl<B: BlockT, N: Network<B>> Future for NetworkBridge<B, N> {
}
}
match self.gossip_engine.poll_unpin(cx) {
// The gossip engine future finished. We should do the same.
Poll::Ready(()) => return Poll::Ready(Ok(())),
Poll::Pending => {},
}
Poll::Pending
}
}