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Subscribe to altair gossip topics 2 slots before fork (#2532)

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## Issue Addressed

N/A

## Proposed Changes

Add a fork_digest to `ForkContext` only if it is set in the config.
Reject gossip messages on post fork topics before the fork happens.

Edit: Instead of rejecting gossip messages on post fork topics, we now subscribe to post fork topics 2 slots before the fork.

Co-authored-by: Age Manning <Age@AgeManning.com>
This commit is contained in:
Pawan Dhananjay
2021-09-17 01:11:16 +00:00
parent acdcea9663
commit 64ad2af100
7 changed files with 145 additions and 24 deletions
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9
beacon_node/eth2_libp2p/src/behaviour/mod.rs
View File

@@ -326,6 +326,15 @@ impl<TSpec: EthSpec> Behaviour<TSpec> {
self.unsubscribe(gossip_topic)
}
/// Subscribe to all currently subscribed topics with the new fork digest.
pub fn subscribe_new_fork_topics(&mut self, new_fork_digest: [u8; 4]) {
let subscriptions = self.network_globals.gossipsub_subscriptions.read().clone();
for mut topic in subscriptions.into_iter() {
topic.fork_digest = new_fork_digest;
self.subscribe(topic);
}
}
/// Unsubscribe from all topics that doesn't have the given fork_digest
pub fn unsubscribe_from_fork_topics_except(&mut self, except: [u8; 4]) {
let subscriptions = self.network_globals.gossipsub_subscriptions.read().clone();

6
beacon_node/eth2_libp2p/src/rpc/codec/ssz_snappy.rs
View File

@@ -615,7 +615,11 @@ mod tests {
type Spec = types::MainnetEthSpec;
fn fork_context() -> ForkContext {
ForkContext::new::<Spec>(types::Slot::new(0), Hash256::zero(), &Spec::default_spec())
let mut chain_spec = Spec::default_spec();
// Set fork_epoch to `Some` to ensure that the `ForkContext` object
// includes altair in the list of forks
chain_spec.altair_fork_epoch = Some(types::Epoch::new(42));
ForkContext::new::<Spec>(types::Slot::new(0), Hash256::zero(), &chain_spec)
}
fn base_block() -> SignedBeaconBlock<Spec> {