Implement PeerDAS subnet decoupling (aka custody groups)

beacon_node/beacon_chain/src/block_verification_types.rs

@@ -165,7 +165,7 @@ impl<E: EthSpec> RpcBlock<E> {
         let inner = if !custody_columns.is_empty() {
             RpcBlockInner::BlockAndCustodyColumns(
                 block,
-                RuntimeVariableList::new(custody_columns, spec.number_of_columns)?,
+                RuntimeVariableList::new(custody_columns, spec.number_of_columns as usize)?,
             )
         } else {
             RpcBlockInner::Block(block)

beacon_node/beacon_chain/src/data_availability_checker.rs

@@ -116,21 +116,13 @@ impl<T: BeaconChainTypes> DataAvailabilityChecker<T> {
         spec: Arc<ChainSpec>,
         log: Logger,
     ) -> Result<Self, AvailabilityCheckError> {
-        let custody_subnet_count = if import_all_data_columns {
-            spec.data_column_sidecar_subnet_count as usize
-        } else {
-            spec.custody_requirement as usize
-        };
-
-        let subnet_sampling_size =
-            std::cmp::max(custody_subnet_count, spec.samples_per_slot as usize);
-        let sampling_column_count =
-            subnet_sampling_size.saturating_mul(spec.data_columns_per_subnet());
+        let custody_group_count = spec.custody_group_count(import_all_data_columns);
+        let sampling_size = spec.sampling_size(custody_group_count);
 
         let inner = DataAvailabilityCheckerInner::new(
             OVERFLOW_LRU_CAPACITY,
             store,
-            sampling_column_count,
+            sampling_size as usize,
             spec.clone(),
         )?;
         Ok(Self {
@@ -147,7 +139,7 @@ impl<T: BeaconChainTypes> DataAvailabilityChecker<T> {
     }
 
     pub(crate) fn is_supernode(&self) -> bool {
-        self.get_sampling_column_count() == self.spec.number_of_columns
+        self.get_sampling_column_count() == self.spec.number_of_columns as usize
     }
 
     /// Checks if the block root is currenlty in the availability cache awaiting import because
@@ -424,7 +416,7 @@ impl<T: BeaconChainTypes> DataAvailabilityChecker<T> {
             .map(CustodyDataColumn::into_inner)
             .collect::<Vec<_>>();
         let all_data_columns =
-            RuntimeVariableList::from_vec(all_data_columns, self.spec.number_of_columns);
+            RuntimeVariableList::from_vec(all_data_columns, self.spec.number_of_columns as usize);
 
         // verify kzg for all data columns at once
         if !all_data_columns.is_empty() {

beacon_node/beacon_chain/src/data_availability_checker/overflow_lru_cache.rs

@@ -546,7 +546,7 @@ impl<T: BeaconChainTypes> DataAvailabilityCheckerInner<T> {
 
         // If we're sampling all columns, it means we must be custodying all columns.
         let custody_column_count = self.sampling_column_count();
-        let total_column_count = self.spec.number_of_columns;
+        let total_column_count = self.spec.number_of_columns as usize;
         let received_column_count = pending_components.verified_data_columns.len();
 
         if pending_components.reconstruction_started {
@@ -555,7 +555,7 @@ impl<T: BeaconChainTypes> DataAvailabilityCheckerInner<T> {
         if custody_column_count != total_column_count {
             return ReconstructColumnsDecision::No("not required for full node");
         }
-        if received_column_count == self.spec.number_of_columns {
+        if received_column_count == total_column_count {
             return ReconstructColumnsDecision::No("all columns received");
         }
         if received_column_count < total_column_count / 2 {

beacon_node/beacon_chain/src/data_column_verification.rs

@@ -423,7 +423,7 @@ fn verify_data_column_sidecar<E: EthSpec>(
     data_column: &DataColumnSidecar<E>,
     spec: &ChainSpec,
 ) -> Result<(), GossipDataColumnError> {
-    if data_column.index >= spec.number_of_columns as u64 {
+    if data_column.index >= spec.number_of_columns {
         return Err(GossipDataColumnError::InvalidColumnIndex(data_column.index));
     }
     if data_column.kzg_commitments.is_empty() {
@@ -611,7 +611,7 @@ fn verify_index_matches_subnet<E: EthSpec>(
     spec: &ChainSpec,
 ) -> Result<(), GossipDataColumnError> {
     let expected_subnet: u64 =
-        DataColumnSubnetId::from_column_index::<E>(data_column.index as usize, spec).into();
+        DataColumnSubnetId::from_column_index(data_column.index, spec).into();
     if expected_subnet != subnet {
         return Err(GossipDataColumnError::InvalidSubnetId {
             received: subnet,

beacon_node/beacon_chain/src/kzg_utils.rs

@@ -192,7 +192,7 @@ fn build_data_column_sidecars<E: EthSpec>(
     blob_cells_and_proofs_vec: Vec<CellsAndKzgProofs>,
     spec: &ChainSpec,
 ) -> Result<DataColumnSidecarList<E>, String> {
-    let number_of_columns = spec.number_of_columns;
+    let number_of_columns = spec.number_of_columns as usize;
     let mut columns = vec![Vec::with_capacity(E::max_blobs_per_block()); number_of_columns];
     let mut column_kzg_proofs =
         vec![Vec::with_capacity(E::max_blobs_per_block()); number_of_columns];
@@ -341,7 +341,7 @@ mod test {
             .kzg_commitments_merkle_proof()
             .unwrap();
 
-        assert_eq!(column_sidecars.len(), spec.number_of_columns);
+        assert_eq!(column_sidecars.len(), spec.number_of_columns as usize);
         for (idx, col_sidecar) in column_sidecars.iter().enumerate() {
             assert_eq!(col_sidecar.index, idx as u64);
 
@@ -374,7 +374,7 @@ mod test {
         )
         .unwrap();
 
-        for i in 0..spec.number_of_columns {
+        for i in 0..spec.number_of_columns as usize {
             assert_eq!(reconstructed_columns.get(i), column_sidecars.get(i), "{i}");
         }
     }

beacon_node/beacon_chain/src/observed_data_sidecars.rs

@@ -59,7 +59,7 @@ impl<E: EthSpec> ObservableDataSidecar for DataColumnSidecar<E> {
     }
 
     fn max_num_of_items(spec: &ChainSpec) -> usize {
-        spec.number_of_columns
+        spec.number_of_columns as usize
     }
 }
 

beacon_node/http_api/src/publish_blocks.rs

@@ -395,9 +395,8 @@ fn build_gossip_verified_data_columns<T: BeaconChainTypes>(
     let gossip_verified_data_columns = data_column_sidecars
         .into_iter()
         .map(|data_column_sidecar| {
-            let column_index = data_column_sidecar.index as usize;
-            let subnet =
-                DataColumnSubnetId::from_column_index::<T::EthSpec>(column_index, &chain.spec);
+            let column_index = data_column_sidecar.index;
+            let subnet = DataColumnSubnetId::from_column_index(column_index, &chain.spec);
             let gossip_verified_column =
                 GossipVerifiedDataColumn::new(data_column_sidecar, subnet.into(), chain);
 
@@ -520,10 +519,7 @@ fn publish_column_sidecars<T: BeaconChainTypes>(
     let pubsub_messages = data_column_sidecars
         .into_iter()
         .map(|data_col| {
-            let subnet = DataColumnSubnetId::from_column_index::<T::EthSpec>(
-                data_col.index as usize,
-                &chain.spec,
-            );
+            let subnet = DataColumnSubnetId::from_column_index(data_col.index, &chain.spec);
             PubsubMessage::DataColumnSidecar(Box::new((subnet, data_col)))
         })
         .collect::<Vec<_>>();

beacon_node/lighthouse_network/src/discovery/enr.rs

@@ -25,8 +25,8 @@ pub const ETH2_ENR_KEY: &str = "eth2";
 pub const ATTESTATION_BITFIELD_ENR_KEY: &str = "attnets";
 /// The ENR field specifying the sync committee subnet bitfield.
 pub const SYNC_COMMITTEE_BITFIELD_ENR_KEY: &str = "syncnets";
-/// The ENR field specifying the peerdas custody subnet count.
-pub const PEERDAS_CUSTODY_SUBNET_COUNT_ENR_KEY: &str = "csc";
+/// The ENR field specifying the peerdas custody group count.
+pub const PEERDAS_CUSTODY_GROUP_COUNT_ENR_KEY: &str = "cgc";
 
 /// Extension trait for ENR's within Eth2.
 pub trait Eth2Enr {
@@ -38,8 +38,8 @@ pub trait Eth2Enr {
         &self,
     ) -> Result<EnrSyncCommitteeBitfield<E>, &'static str>;
 
-    /// The peerdas custody subnet count associated with the ENR.
-    fn custody_subnet_count<E: EthSpec>(&self, spec: &ChainSpec) -> Result<u64, &'static str>;
+    /// The peerdas custody group count associated with the ENR.
+    fn custody_group_count<E: EthSpec>(&self, spec: &ChainSpec) -> Result<u64, &'static str>;
 
     fn eth2(&self) -> Result<EnrForkId, &'static str>;
 }
@@ -67,16 +67,16 @@ impl Eth2Enr for Enr {
             .map_err(|_| "Could not decode the ENR syncnets bitfield")
     }
 
-    fn custody_subnet_count<E: EthSpec>(&self, spec: &ChainSpec) -> Result<u64, &'static str> {
-        let csc = self
-            .get_decodable::<u64>(PEERDAS_CUSTODY_SUBNET_COUNT_ENR_KEY)
-            .ok_or("ENR custody subnet count non-existent")?
-            .map_err(|_| "Could not decode the ENR custody subnet count")?;
+    fn custody_group_count<E: EthSpec>(&self, spec: &ChainSpec) -> Result<u64, &'static str> {
+        let cgc = self
+            .get_decodable::<u64>(PEERDAS_CUSTODY_GROUP_COUNT_ENR_KEY)
+            .ok_or("ENR custody group count non-existent")?
+            .map_err(|_| "Could not decode the ENR custody group count")?;
 
-        if csc >= spec.custody_requirement && csc <= spec.data_column_sidecar_subnet_count {
-            Ok(csc)
+        if (spec.custody_requirement..=spec.number_of_custody_groups).contains(&cgc) {
+            Ok(cgc)
         } else {
-            Err("Invalid custody subnet count in ENR")
+            Err("Invalid custody group count in ENR")
         }
     }
 
@@ -253,14 +253,14 @@ pub fn build_enr<E: EthSpec>(
         &bitfield.as_ssz_bytes().into(),
     );
 
-    // only set `csc` if PeerDAS fork epoch has been scheduled
+    // only set `cgc` if PeerDAS fork epoch has been scheduled
     if spec.is_peer_das_scheduled() {
-        let custody_subnet_count = if config.subscribe_all_data_column_subnets {
-            spec.data_column_sidecar_subnet_count
+        let custody_group_count = if config.subscribe_all_data_column_subnets {
+            spec.number_of_custody_groups
         } else {
             spec.custody_requirement
         };
-        builder.add_value(PEERDAS_CUSTODY_SUBNET_COUNT_ENR_KEY, &custody_subnet_count);
+        builder.add_value(PEERDAS_CUSTODY_GROUP_COUNT_ENR_KEY, &custody_group_count);
     }
 
     builder
@@ -287,11 +287,11 @@ fn compare_enr(local_enr: &Enr, disk_enr: &Enr) -> bool {
         && (local_enr.udp4().is_none() || local_enr.udp4() == disk_enr.udp4())
         && (local_enr.udp6().is_none() || local_enr.udp6() == disk_enr.udp6())
         // we need the ATTESTATION_BITFIELD_ENR_KEY and SYNC_COMMITTEE_BITFIELD_ENR_KEY and
-        // PEERDAS_CUSTODY_SUBNET_COUNT_ENR_KEY key to match, otherwise we use a new ENR. This will
+        // PEERDAS_CUSTODY_GROUP_COUNT_ENR_KEY key to match, otherwise we use a new ENR. This will
         // likely only be true for non-validating nodes.
         && local_enr.get_decodable::<Bytes>(ATTESTATION_BITFIELD_ENR_KEY) == disk_enr.get_decodable(ATTESTATION_BITFIELD_ENR_KEY)
         && local_enr.get_decodable::<Bytes>(SYNC_COMMITTEE_BITFIELD_ENR_KEY) == disk_enr.get_decodable(SYNC_COMMITTEE_BITFIELD_ENR_KEY)
-        && local_enr.get_decodable::<Bytes>(PEERDAS_CUSTODY_SUBNET_COUNT_ENR_KEY) == disk_enr.get_decodable(PEERDAS_CUSTODY_SUBNET_COUNT_ENR_KEY)
+        && local_enr.get_decodable::<Bytes>(PEERDAS_CUSTODY_GROUP_COUNT_ENR_KEY) == disk_enr.get_decodable(PEERDAS_CUSTODY_GROUP_COUNT_ENR_KEY)
 }
 
 /// Loads enr from the given directory
@@ -348,7 +348,7 @@ mod test {
     }
 
     #[test]
-    fn custody_subnet_count_default() {
+    fn custody_group_count_default() {
         let config = NetworkConfig {
             subscribe_all_data_column_subnets: false,
             ..NetworkConfig::default()
@@ -358,13 +358,13 @@ mod test {
         let enr = build_enr_with_config(config, &spec).0;
 
         assert_eq!(
-            enr.custody_subnet_count::<E>(&spec).unwrap(),
+            enr.custody_group_count::<E>(&spec).unwrap(),
             spec.custody_requirement,
         );
     }
 
     #[test]
-    fn custody_subnet_count_all() {
+    fn custody_group_count_all() {
         let config = NetworkConfig {
             subscribe_all_data_column_subnets: true,
             ..NetworkConfig::default()
@@ -373,8 +373,8 @@ mod test {
         let enr = build_enr_with_config(config, &spec).0;
 
         assert_eq!(
-            enr.custody_subnet_count::<E>(&spec).unwrap(),
-            spec.data_column_sidecar_subnet_count,
+            enr.custody_group_count::<E>(&spec).unwrap(),
+            spec.number_of_custody_groups,
         );
     }
 

beacon_node/lighthouse_network/src/discovery/subnet_predicate.rs

@@ -1,10 +1,10 @@
 //! The subnet predicate used for searching for a particular subnet.
 use super::*;
 use crate::types::{EnrAttestationBitfield, EnrSyncCommitteeBitfield};
-use itertools::Itertools;
 use slog::trace;
 use std::ops::Deref;
-use types::{ChainSpec, DataColumnSubnetId};
+use types::data_column_custody_group::compute_subnets_for_node;
+use types::ChainSpec;
 
 /// Returns the predicate for a given subnet.
 pub fn subnet_predicate<E>(
@@ -37,13 +37,9 @@ where
                 .as_ref()
                 .map_or(false, |b| b.get(*s.deref() as usize).unwrap_or(false)),
             Subnet::DataColumn(s) => {
-                if let Ok(custody_subnet_count) = enr.custody_subnet_count::<E>(&spec) {
-                    DataColumnSubnetId::compute_custody_subnets::<E>(
-                        enr.node_id().raw(),
-                        custody_subnet_count,
-                        &spec,
-                    )
-                    .map_or(false, |mut subnets| subnets.contains(s))
+                if let Ok(custody_group_count) = enr.custody_group_count::<E>(&spec) {
+                    compute_subnets_for_node(enr.node_id().raw(), custody_group_count, &spec)
+                        .map_or(false, |subnets| subnets.contains(s))
                 } else {
                     false
                 }

beacon_node/lighthouse_network/src/metrics.rs

@@ -93,11 +93,11 @@ pub static PEERS_PER_CLIENT: LazyLock<Result<IntGaugeVec>> = LazyLock::new(|| {
     )
 });
 
-pub static PEERS_PER_CUSTODY_SUBNET_COUNT: LazyLock<Result<IntGaugeVec>> = LazyLock::new(|| {
+pub static PEERS_PER_CUSTODY_GROUP_COUNT: LazyLock<Result<IntGaugeVec>> = LazyLock::new(|| {
     try_create_int_gauge_vec(
-        "peers_per_custody_subnet_count",
-        "The current count of peers by custody subnet count",
-        &["custody_subnet_count"],
+        "peers_per_custody_group_count",
+        "The current count of peers by custody group count",
+        &["custody_group_count"],
     )
 });