custody subnet count decoding during discovery

beacon_chain/gossip_processing/gossip_validation.nim

@@ -16,7 +16,7 @@ import
   # Internals
   ../spec/[
     beaconstate, state_transition_block, forks,
-    helpers, network, signatures, eip7594_helpers],
+    helpers, network, signatures, peerdas_helpers],
   ../consensus_object_pools/[
     attestation_pool, blockchain_dag, blob_quarantine, block_quarantine,
     data_column_quarantine, spec_cache, light_client_pool, sync_committee_msg_pool,
@@ -496,7 +496,7 @@ proc validateBlobSidecar*(
 # https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.8/specs/_features/eip7594/p2p-interface.md#data_column_sidecar_subnet_id
 proc validateDataColumnSidecar*(
     dag: ChainDAGRef, quarantine: ref Quarantine,
-    dataColumnQuarantine: ref DataColumnQuarantine, 
+    dataColumnQuarantine: ref DataColumnQuarantine,
     data_column_sidecar: DataColumnSidecar,
     wallTime: BeaconTime, subnet_id: uint64):
     Result[void, ValidationError] =
@@ -508,14 +508,14 @@ proc validateDataColumnSidecar*(
   if not (data_column_sidecar.index < NUMBER_OF_COLUMNS):
     return dag.checkedReject("DataColumnSidecar: The sidecar's index should be consistent with NUMBER_OF_COLUMNS")
 
-  # [REJECT] The sidecar is for the correct subnet 
+  # [REJECT] The sidecar is for the correct subnet
   # -- i.e. `compute_subnet_for_data_column_sidecar(blob_sidecar.index) == subnet_id`.
   if not (compute_subnet_for_data_column_sidecar(data_column_sidecar.index) == subnet_id):
     return dag.checkedReject("DataColumnSidecar: The sidecar is not for the correct subnet")
 
-  # [IGNORE] The sidecar is not from a future slot 
-  # (with a `MAXIMUM_GOSSIP_CLOCK_DISPARITY` allowance) -- i.e. validate that 
-  # `block_header.slot <= current_slot`(a client MAY queue future sidecars for 
+  # [IGNORE] The sidecar is not from a future slot
+  # (with a `MAXIMUM_GOSSIP_CLOCK_DISPARITY` allowance) -- i.e. validate that
+  # `block_header.slot <= current_slot`(a client MAY queue future sidecars for
   # processing at the appropriate slot).
   if not (block_header.slot <=
       (wallTime + MAXIMUM_GOSSIP_CLOCK_DISPARITY).slotOrZero):
@@ -608,7 +608,7 @@ proc validateDataColumnSidecar*(
       data_column_sidecar.signed_block_header.signature):
     return dag.checkedReject("DataColumnSidecar: Invalid proposer signature")
 
-  # [REJECT] The sidecar's column data is valid as 
+  # [REJECT] The sidecar's column data is valid as
   # verified by `verify_data_column_kzg_proofs(sidecar)`
   block:
     let r = check_data_column_sidecar_kzg_proofs(data_column_sidecar)

beacon_chain/networking/eth2_discovery.nim

@@ -11,7 +11,7 @@ import
   std/[algorithm, sequtils],
   chronos, chronicles,
   eth/p2p/discoveryv5/[enr, protocol, node, random2],
-  ../spec/datatypes/altair,
+  ../spec/datatypes/[altair, fulu],
   ../spec/eth2_ssz_serialization,
   ".."/[conf, conf_light_client]
 
@@ -127,6 +127,7 @@ proc queryRandom*(
     forkId: ENRForkID,
     wantedAttnets: AttnetBits,
     wantedSyncnets: SyncnetBits,
+    wantedCscnets: CscBits,
     minScore: int): Future[seq[Node]] {.async: (raises: [CancelledError]).} =
   ## Perform a discovery query for a random target
   ## (forkId) and matching at least one of the attestation subnets.
@@ -151,13 +152,26 @@ proc queryRandom*(
     if not forkId.isCompatibleForkId(peerForkId):
       continue
 
+    let cscCountBytes = n.record.get(enrCustodySubnetCountField, seq[byte])
+    if cscCountBytes.isOk():
+      let cscCountNode =
+        try:
+          SSZ.decode(cscCountBytes.get(), uint8)
+        except SerializationError as e:
+          debug "Could not decode the csc ENR field of peer",
+            peer = n.record.toURI(), exception = e.name, msg = e.msg
+          continue
+
+      if wantedCscnets.countOnes().uint8 == cscCountNode:
+        score += 1
+
     let attnetsBytes = n.record.get(enrAttestationSubnetsField, seq[byte])
     if attnetsBytes.isOk():
       let attnetsNode =
         try:
           SSZ.decode(attnetsBytes.get(), AttnetBits)
         except SerializationError as e:
-          debug "Could not decode the attnets ERN bitfield of peer",
+          debug "Could not decode the attnets ENR bitfield of peer",
             peer = n.record.toURI(), exception = e.name, msg = e.msg
           continue
 

beacon_chain/networking/eth2_network.nim

@@ -1505,7 +1505,8 @@ proc trimConnections(node: Eth2Node, count: int) =
     inc(nbc_cycling_kicked_peers)
     if toKick <= 0: return
 
-proc getLowSubnets(node: Eth2Node, epoch: Epoch): (AttnetBits, SyncnetBits) =
+proc getLowSubnets(node: Eth2Node, epoch: Epoch):
+                  (AttnetBits, SyncnetBits, CscBits) =
   # Returns the subnets required to have a healthy mesh
   # The subnets are computed, to, in order:
   # - Have 0 subnet with < `dLow` peers from topic subscription
@@ -1570,7 +1571,11 @@ proc getLowSubnets(node: Eth2Node, epoch: Epoch): (AttnetBits, SyncnetBits) =
     if epoch + 1 >= node.cfg.ALTAIR_FORK_EPOCH:
       findLowSubnets(getSyncCommitteeTopic, SyncSubcommitteeIndex, SYNC_COMMITTEE_SUBNET_COUNT)
     else:
-      default(SyncnetBits)
+      default(SyncnetBits),
+    if epoch >= node.cfg.FULU_FORK_EPOCH:
+      findLowSubnets(getDataColumnSidecarTopic, uint64, (DATA_COLUMN_SIDECAR_SUBNET_COUNT).int)
+    else:
+      default(CscBits)
   )
 
 proc runDiscoveryLoop(node: Eth2Node) {.async: (raises: [CancelledError]).} =
@@ -1579,23 +1584,29 @@ proc runDiscoveryLoop(node: Eth2Node) {.async: (raises: [CancelledError]).} =
   while true:
     let
       currentEpoch = node.getBeaconTime().slotOrZero.epoch
-      (wantedAttnets, wantedSyncnets) = node.getLowSubnets(currentEpoch)
+      (wantedAttnets, wantedSyncnets, wantedCscnets) = node.getLowSubnets(currentEpoch)
       wantedAttnetsCount = wantedAttnets.countOnes()
       wantedSyncnetsCount = wantedSyncnets.countOnes()
+      wantedCscnetsCount = wantedCscnets.countOnes()
       outgoingPeers = node.peerPool.lenCurrent({PeerType.Outgoing})
       targetOutgoingPeers = max(node.wantedPeers div 10, 3)
 
     if wantedAttnetsCount > 0 or wantedSyncnetsCount > 0 or
-        outgoingPeers < targetOutgoingPeers:
+        wantedCscnetsCount > 0 or outgoingPeers < targetOutgoingPeers:
 
       let
         minScore =
-          if wantedAttnetsCount > 0 or wantedSyncnetsCount > 0:
+          if wantedAttnetsCount > 0 or wantedSyncnetsCount > 0 or
+              wantedCscnetsCount > 0:
             1
           else:
             0
         discoveredNodes = await node.discovery.queryRandom(
-          node.discoveryForkId, wantedAttnets, wantedSyncnets, minScore)
+          node.discoveryForkId,
+          wantedAttnets,
+          wantedSyncnets,
+          wantedCscnets,
+          minScore)
 
       let newPeers = block:
         var np = newSeq[PeerAddr]()

beacon_chain/nimbus_beacon_node.nim

@@ -21,7 +21,7 @@ import
   ./spec/datatypes/[altair, bellatrix, phase0],
   ./spec/[
     deposit_snapshots, engine_authentication, weak_subjectivity,
-    eip7594_helpers],
+    peerdas_helpers],
   ./sync/[sync_protocol, light_client_protocol, sync_overseer],
   ./validators/[keystore_management, beacon_validators],
   "."/[
@@ -535,7 +535,7 @@ proc initFullNode(
       processor: processor,
       network: node.network)
     requestManager = RequestManager.init(
-      node.network, supernode, custody_columns_set, dag.cfg.DENEB_FORK_EPOCH, 
+      node.network, supernode, custody_columns_set, dag.cfg.DENEB_FORK_EPOCH,
       getBeaconTime, (proc(): bool = syncManager.inProgress),
       quarantine, blobQuarantine, dataColumnQuarantine, rmanBlockVerifier,
       rmanBlockLoader, rmanBlobLoader, rmanDataColumnLoader)

beacon_chain/spec/network.nim

@@ -235,3 +235,13 @@ func getSyncSubnets*(
 iterator blobSidecarTopics*(forkDigest: ForkDigest): string =
   for subnet_id in BlobId:
     yield getBlobSidecarTopic(forkDigest, subnet_id)
+
+# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.10/specs/fulu/p2p-interface.md#data_column_sidecar_subnet_id
+func getDataColumnSidecarTopic*(forkDigest: ForkDigest,
+                                subnet_id: uint64): string =
+  eth2Prefix(forkDigest) & "data_column_sidecar_" & $subnet_id & "/ssz_snappy"
+
+iterator dataColumnSidecarTopics*(forkDigest: ForkDigest,
+                                  targetSubnetCount: uint64): string =
+  for subnet_id in 0'u64..<targetSubnetCount:
+    yield getDataColumnSidecarTopic(forkDigest, subnet_id)

beacon_chain/sync/request_manager.nim

@@ -11,7 +11,7 @@ import std/[sequtils, strutils]
 import chronos, chronicles
 import
   ../spec/datatypes/[phase0, deneb, fulu],
-  ../spec/[forks, network, eip7594_helpers],
+  ../spec/[forks, network, peerdas_helpers],
   ../networking/eth2_network,
   ../consensus_object_pools/block_quarantine,
   ../consensus_object_pools/blob_quarantine,
@@ -299,23 +299,23 @@ proc checkPeerCustody*(rman: RequestManager,
                        peer: Peer):
                        bool =
   # Returns true if the peer custodies atleast
-  # ONE of the common custody columns, straight 
+  # ONE of the common custody columns, straight
   # away returns true if the peer is a supernode.
   if rman.supernode:
     # For a supernode, it is always best/optimistic
     # to filter other supernodes, rather than filter
     # too many full nodes that have a subset of the custody
     # columns
-    if peer.lookupCscFromPeer() == 
+    if peer.lookupCscFromPeer() ==
         DATA_COLUMN_SIDECAR_SUBNET_COUNT.uint64:
       return true
-  
+
   else:
-    if peer.lookupCscFromPeer() == 
+    if peer.lookupCscFromPeer() ==
         DATA_COLUMN_SIDECAR_SUBNET_COUNT.uint64:
       return true
 
-    elif peer.lookupCscFromPeer() == 
+    elif peer.lookupCscFromPeer() ==
         CUSTODY_REQUIREMENT.uint64:
 
       # Fetch the remote custody count
@@ -333,9 +333,9 @@ proc checkPeerCustody*(rman: RequestManager,
       for local_column in rman.custody_columns_set:
         if local_column notin remoteCustodyColumns:
           return false
-      
+
       return true
-    
+
     else:
       return false
 
@@ -551,7 +551,7 @@ proc getMissingDataColumns(rman: RequestManager): HashSet[DataColumnIdentifier]
     wallTime = rman.getBeaconTime()
     wallSlot = wallTime.slotOrZero()
     delay = wallTime - wallSlot.start_beacon_time()
-  
+
   const waitDur = TimeDiff(nanoseconds: DATA_COLUMN_GOSSIP_WAIT_TIME_NS)
 
   var
@@ -574,7 +574,7 @@ proc getMissingDataColumns(rman: RequestManager): HashSet[DataColumnIdentifier]
              commitments = len(forkyBlck.message.body.blob_kzg_commitments)
           for idx in missing.indices:
             let id = DataColumnIdentifier(block_root: columnless.root, index: idx)
-            if id.index in rman.custody_columns_set and id notin fetches and 
+            if id.index in rman.custody_columns_set and id notin fetches and
                 len(forkyBlck.message.body.blob_kzg_commitments) != 0:
               fetches.incl(id)
         else:
@@ -583,7 +583,7 @@ proc getMissingDataColumns(rman: RequestManager): HashSet[DataColumnIdentifier]
              blk = columnless.root,
              commitments = len(forkyBlck.message.body.blob_kzg_commitments)
           ready.add(columnless.root)
-  
+
   for root in ready:
     let columnless = rman.quarantine[].popColumnless(root).valueOr:
       continue
@@ -593,7 +593,7 @@ proc getMissingDataColumns(rman: RequestManager): HashSet[DataColumnIdentifier]
 proc requestManagerDataColumnLoop(
     rman: RequestManager) {.async: (raises: [CancelledError]).} =
   while true:
-    
+
     await sleepAsync(POLL_INTERVAL)
     if rman.inhibit():
       continue
@@ -623,7 +623,7 @@ proc requestManagerDataColumnLoop(
         debug "Loaded orphaned data columns from storage", columnId
         rman.dataColumnQuarantine[].put(data_column_sidecar)
       var verifiers = newSeqOfCap[
-        Future[Result[void, VerifierError]]  
+        Future[Result[void, VerifierError]]
           .Raising([CancelledError])](blockRoots.len)
       for blockRoot in blockRoots:
         let blck = rman.quarantine[].popColumnless(blockRoot).valueOr:
@@ -644,7 +644,7 @@ proc requestManagerDataColumnLoop(
         array[PARALLEL_REQUESTS_DATA_COLUMNS, Future[void].Raising([CancelledError])]
       for i in 0..<PARALLEL_REQUESTS_DATA_COLUMNS:
         workers[i] = rman.fetchDataColumnsFromNetwork(columnIds)
-      
+
       await allFutures(workers)
       let finish = SyncMoment.now(uint64(len(columnIds)))
 

tests/consensus_spec/test_fixture_networking.nim

@@ -14,7 +14,7 @@ import
   kzg4844/[kzg, kzg_abi],
   stint,
   eth/p2p/discoveryv5/[node],
-  ../../beacon_chain/spec/eip7594_helpers,
+  ../../beacon_chain/spec/peerdas_helpers,
   ../testutil,
   ./fixtures_utils, ./os_ops
 

tests/test_discovery.nim

@@ -36,6 +36,7 @@ proc generateNode(rng: ref HmacDrbgContext, port: Port,
 
 # TODO: Add tests with a syncnets preference
 const noSyncnetsPreference = SyncnetBits()
+const noCscnetsPreference = CscBits()
 
 procSuite "Eth2 specific discovery tests":
   let
@@ -67,7 +68,8 @@ procSuite "Eth2 specific discovery tests":
     attnetsSelected.setBit(34)
 
     let discovered = await node1.queryRandom(
-      enrForkId, attnetsSelected, noSyncnetsPreference, 1)
+      enrForkId, attnetsSelected, noSyncnetsPreference,
+      noCscnetsPreference, 1)
     check discovered.len == 1
 
     await node1.closeWait()
@@ -105,7 +107,8 @@ procSuite "Eth2 specific discovery tests":
     attnetsSelected.setBit(42)
 
     let discovered = await node1.queryRandom(
-      enrForkId, attnetsSelected, noSyncnetsPreference, 1)
+      enrForkId, attnetsSelected, noSyncnetsPreference,
+      noCscnetsPreference, 1)
     check discovered.len == 1
 
     await node1.closeWait()
@@ -133,7 +136,8 @@ procSuite "Eth2 specific discovery tests":
 
     block:
       let discovered = await node1.queryRandom(
-        enrForkId, attnetsSelected, noSyncnetsPreference, 1)
+        enrForkId, attnetsSelected, noSyncnetsPreference,
+        noCscnetsPreference, 1)
       check discovered.len == 0
 
     block:
@@ -148,7 +152,8 @@ procSuite "Eth2 specific discovery tests":
       discard node1.addNode(nodes[][0])
 
       let discovered = await node1.queryRandom(
-        enrForkId, attnetsSelected, noSyncnetsPreference, 1)
+        enrForkId, attnetsSelected, noSyncnetsPreference,
+        noCscnetsPreference, 1)
       check discovered.len == 1
 
     await node1.closeWait()

tests/test_eip7594_helpers.nim

@@ -14,7 +14,7 @@ import
   results,
   kzg4844/[kzg_abi, kzg],
   ./consensus_spec/[os_ops, fixtures_utils],
-  ../beacon_chain/spec/[helpers, eip7594_helpers],
+  ../beacon_chain/spec/[helpers, peerdas_helpers],
   ../beacon_chain/spec/datatypes/[fulu, deneb]
 
 from std/strutils import rsplit
@@ -79,7 +79,7 @@ suite "EIP-7594 Unit Tests":
         blob_count = rng.rand(1..(NUMBER_OF_COLUMNS.int))
         blobs = createSampleKzgBlobs(blob_count, rng.rand(int))
         extended_matrix = compute_matrix(blobs)
-      
+
       # Construct a matrix with some entries missing
       var partial_matrix: seq[MatrixEntry]
       for blob_entries in chunks(extended_matrix.get, kzg_abi.CELLS_PER_EXT_BLOB):