Add chainspec and genesis validators root to eth2_libp2p

beacon_node/eth2_libp2p/src/behaviour/mod.rs

@@ -43,7 +43,7 @@ use std::{
     sync::Arc,
     task::{Context, Poll},
 };
-use types::{ChainSpec, EnrForkId, EthSpec, SignedBeaconBlock, Slot, SubnetId};
+use types::{ChainSpec, EnrForkId, EthSpec, Hash256, SignedBeaconBlock, Slot, SubnetId};
 
 mod gossipsub_scoring_parameters;
 mod handler;
@@ -136,6 +136,11 @@ pub struct Behaviour<TSpec: EthSpec> {
 
     score_settings: PeerScoreSettings<TSpec>,
 
+    spec: ChainSpec,
+
+    /// The genesis root for the eth2 network
+    genesis_validators_root: Hash256,
+
     /// The interval for updating gossipsub scores
     update_gossipsub_scores: tokio::time::Interval,
 }
@@ -147,6 +152,7 @@ impl<TSpec: EthSpec> Behaviour<TSpec> {
         net_conf: &NetworkConfig,
         network_globals: Arc<NetworkGlobals<TSpec>>,
         log: &slog::Logger,
+        genesis_validators_root: Hash256,
         chain_spec: &ChainSpec,
     ) -> error::Result<Self> {
         let behaviour_log = log.new(o!());
@@ -232,7 +238,9 @@ impl<TSpec: EthSpec> Behaviour<TSpec> {
             network_dir: net_conf.network_dir.clone(),
             log: behaviour_log,
             score_settings,
+            spec: chain_spec.clone(),
             update_gossipsub_scores,
+            genesis_validators_root,
         })
     }
 

beacon_node/eth2_libp2p/src/service.rs

@@ -25,7 +25,7 @@ use std::io::prelude::*;
 use std::pin::Pin;
 use std::sync::Arc;
 use std::time::Duration;
-use types::{ChainSpec, EnrForkId, EthSpec};
+use types::{ChainSpec, EnrForkId, EthSpec, Hash256};
 
 pub const NETWORK_KEY_FILENAME: &str = "key";
 /// The maximum simultaneous libp2p connections per peer.
@@ -64,6 +64,7 @@ impl<TSpec: EthSpec> Service<TSpec> {
         config: &NetworkConfig,
         enr_fork_id: EnrForkId,
         log: &Logger,
+        genesis_validators_root: Hash256,
         chain_spec: &ChainSpec,
     ) -> error::Result<(Arc<NetworkGlobals<TSpec>>, Self)> {
         let log = log.new(o!("service"=> "libp2p"));
@@ -113,6 +114,7 @@ impl<TSpec: EthSpec> Service<TSpec> {
                 config,
                 network_globals.clone(),
                 &log,
+                genesis_validators_root,
                 chain_spec,
             )
             .await?;

beacon_node/network/src/service.rs

@@ -166,6 +166,7 @@ impl<T: BeaconChainTypes> NetworkService<T> {
             config,
             enr_fork_id,
             &network_log,
+            beacon_chain.genesis_validators_root,
             &beacon_chain.spec,
         )
         .await?;

boot_node/src/config.rs

@@ -111,7 +111,7 @@ impl<T: EthSpec> TryFrom<&ArgMatches<'_>> for BootNodeConfig<T> {
 
                 // If we know of the ENR field, add it to the initial construction
                 if let Some(enr_fork_bytes) = enr_fork {
-                    builder.add_value("eth2", &enr_fork_bytes);
+                    builder.add_value("eth2", enr_fork_bytes.as_slice());
                 }
                 builder
                     .build(&local_key)

consensus/types/src/chain_spec.rs

@@ -148,20 +148,33 @@ impl ChainSpec {
     }
 
     /// Returns an `EnrForkId` for the given `slot`.
-    ///
-    /// Presently, we don't have any forks so we just ignore the slot. In the future this function
-    /// may return something different based upon the slot.
-    pub fn enr_fork_id(&self, _slot: Slot, genesis_validators_root: Hash256) -> EnrForkId {
+    pub fn enr_fork_id(&self, slot: Slot, genesis_validators_root: Hash256) -> EnrForkId {
         EnrForkId {
-            fork_digest: Self::compute_fork_digest(
-                self.genesis_fork_version,
-                genesis_validators_root,
-            ),
+            fork_digest: self.fork_digest(slot, genesis_validators_root),
             next_fork_version: self.genesis_fork_version,
             next_fork_epoch: self.far_future_epoch,
         }
     }
 
+    /// Returns the `ForkDigest` for the given slot.
+    ///
+    /// Add additional if else branches with additional forks.
+    pub fn fork_digest(&self, slot: Slot, genesis_validators_root: Hash256) -> [u8; 4] {
+        if slot >= self.altair_fork_slot {
+            Self::compute_fork_digest(self.altair_fork_version, genesis_validators_root)
+        } else {
+            Self::compute_fork_digest(self.genesis_fork_version, genesis_validators_root)
+        }
+    }
+
+    pub fn genesis_fork_digest(&self, genesis_validators_root: Hash256) -> [u8; 4] {
+        Self::compute_fork_digest(self.genesis_fork_version, genesis_validators_root)
+    }
+
+    pub fn altair_fork_digest(&self, genesis_validators_root: Hash256) -> [u8; 4] {
+        Self::compute_fork_digest(self.altair_fork_version, genesis_validators_root)
+    }
+
     /// Returns the epoch of the next scheduled change in the `fork.current_version`.
     ///
     /// There are no future forks scheduled so this function always returns `None`. This may not