implement blob_sidecar Beacon API streaming

beacon_chain/beacon_node.nim

@@ -47,6 +47,7 @@ type
     blsToExecQueue*: AsyncEventQueue[SignedBLSToExecutionChange]
     propSlashQueue*: AsyncEventQueue[ProposerSlashing]
     attSlashQueue*: AsyncEventQueue[AttesterSlashing]
+    blobSidecarQueue*: AsyncEventQueue[BlobSidecarInfoObject]
     finalQueue*: AsyncEventQueue[FinalizationInfoObject]
     reorgQueue*: AsyncEventQueue[ReorgInfoObject]
     contribQueue*: AsyncEventQueue[SignedContributionAndProof]

beacon_chain/consensus_object_pools/blob_quarantine.nim

@@ -7,7 +7,10 @@
 
 {.push raises: [].}
 
-import ../spec/helpers
+import
+  std/tables,
+  ../spec/helpers
+
 from std/sequtils import mapIt
 from std/strutils import join
 
@@ -18,10 +21,14 @@ type
   BlobQuarantine* = object
     blobs*:
       OrderedTable[(Eth2Digest, BlobIndex, KzgCommitment), ref BlobSidecar]
+    onBlobSidecarCallback*: OnBlobSidecarCallback
+
   BlobFetchRecord* = object
     block_root*: Eth2Digest
     indices*: seq[BlobIndex]
 
+  OnBlobSidecarCallback = proc(data: BlobSidecar) {.gcsafe, raises: [].}
+
 func shortLog*(x: seq[BlobIndex]): string =
   "<" & x.mapIt($it).join(", ") & ">"
 
@@ -86,3 +93,7 @@ func blobFetchRecord*(quarantine: BlobQuarantine, blck: deneb.SignedBeaconBlock)
         (blck.root, idx, blck.message.body.blob_kzg_commitments[i])):
       indices.add(idx)
   BlobFetchRecord(block_root: blck.root, indices: indices)
+
+func init*(
+    T: type BlobQuarantine, onBlobSidecarCallback: OnBlobSidecarCallback): T =
+  T(onBlobSidecarCallback: onBlobSidecarCallback)

beacon_chain/gossip_processing/gossip_validation.nim

@@ -440,8 +440,11 @@ proc validateBlobSidecar*(
     if not ok:
       return dag.checkedReject("BlobSidecar: blob invalid")
 
-  ok()
+  # Send notification about new blob sidecar via callback
+  if not(isNil(blobQuarantine.onBlobSidecarCallback)):
+    blobQuarantine.onBlobSidecarCallback(blob_sidecar)
 
+  ok()
 
 # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/p2p-interface.md#beacon_block
 # https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/bellatrix/p2p-interface.md#beacon_block

beacon_chain/nimbus_beacon_node.nim

@@ -8,7 +8,7 @@
 {.push raises: [].}
 
 import
-  std/[os, random, sequtils, terminal, times],
+  std/[os, random, terminal, times],
   chronos, chronicles,
   metrics, metrics/chronos_httpserver,
   stew/[byteutils, io2],
@@ -273,6 +273,8 @@ proc checkWeakSubjectivityCheckpoint(
           headStateSlot = getStateField(dag.headState, slot)
     quit 1
 
+from ./spec/state_transition_block import kzg_commitment_to_versioned_hash
+
 proc initFullNode(
     node: BeaconNode,
     rng: ref HmacDrbgContext,
@@ -293,6 +295,14 @@ proc initFullNode(
     node.eventBus.propSlashQueue.emit(data)
   proc onAttesterSlashingAdded(data: AttesterSlashing) =
     node.eventBus.attSlashQueue.emit(data)
+  proc onBlobSidecarAdded(data: BlobSidecar) =
+    node.eventBus.blobSidecarQueue.emit(
+      BlobSidecarInfoObject(
+        block_root: hash_tree_root(data.signed_block_header.message),
+        index: data.index,
+        slot: data.signed_block_header.message.slot,
+        kzg_commitment: data.kzg_commitment,
+        versioned_hash: data.kzg_commitment.kzg_commitment_to_versioned_hash))
   proc onBlockAdded(data: ForkedTrustedSignedBeaconBlock) =
     let optimistic =
       if node.currentSlot().epoch() >= dag.cfg.BELLATRIX_FORK_EPOCH:
@@ -373,7 +383,7 @@ proc initFullNode(
     validatorChangePool = newClone(ValidatorChangePool.init(
       dag, attestationPool, onVoluntaryExitAdded, onBLSToExecutionChangeAdded,
       onProposerSlashingAdded, onAttesterSlashingAdded))
-    blobQuarantine = newClone(BlobQuarantine())
+    blobQuarantine = newClone(BlobQuarantine.init(onBlobSidecarAdded))
     consensusManager = ConsensusManager.new(
       dag, attestationPool, quarantine, node.elManager,
       ActionTracker.init(node.network.nodeId, config.subscribeAllSubnets),
@@ -553,6 +563,7 @@ proc init*(T: type BeaconNode,
       blsToExecQueue: newAsyncEventQueue[SignedBLSToExecutionChange](),
       propSlashQueue: newAsyncEventQueue[ProposerSlashing](),
       attSlashQueue: newAsyncEventQueue[AttesterSlashing](),
+      blobSidecarQueue: newAsyncEventQueue[BlobSidecarInfoObject](),
       finalQueue: newAsyncEventQueue[FinalizationInfoObject](),
       reorgQueue: newAsyncEventQueue[ReorgInfoObject](),
       contribQueue: newAsyncEventQueue[SignedContributionAndProof](),
@@ -869,6 +880,8 @@ func verifyFinalization(node: BeaconNode, slot: Slot) =
     # finalization occurs every slot, to 4 slots vs scheduledSlot.
     doAssert finalizedEpoch + 4 >= epoch
 
+from std/sequtils import toSeq
+
 func subnetLog(v: BitArray): string =
   $toSeq(v.oneIndices())
 

beacon_chain/rpc/rest_event_api.nim

@@ -145,6 +145,10 @@ proc installEventApiHandlers*(router: var RestRouter, node: BeaconNode) =
           let handler = response.eventHandler(node.eventBus.attSlashQueue,
                                               "attester_slashing")
           res.add(handler)
+        if EventTopic.BlobSidecar in eventTopics:
+          let handler = response.eventHandler(node.eventBus.blobSidecarQueue,
+                                              "blob_sidecar")
+          res.add(handler)
         if EventTopic.FinalizedCheckpoint in eventTopics:
           let handler = response.eventHandler(node.eventBus.finalQueue,
                                               "finalized_checkpoint")

beacon_chain/spec/datatypes/deneb.nim

@@ -60,6 +60,16 @@ type
     kzg_commitment_inclusion_proof*:
       array[KZG_COMMITMENT_INCLUSION_PROOF_DEPTH, Eth2Digest]
 
+  # https://github.com/ethereum/beacon-APIs/blob/4882aa0803b622b75bab286b285599d70b7a2429/apis/eventstream/index.yaml#L138-L142
+  # Spec object, not only internal, because it gets serialized out for the
+  # event stream Beacon API
+  BlobSidecarInfoObject* = object
+    block_root*: Eth2Digest
+    index*: BlobIndex
+    slot*: Slot
+    kzg_commitment*: KzgCommitment
+    versioned_hash*: VersionedHash
+
   # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/deneb/p2p-interface.md#blobidentifier
   BlobIdentifier* = object
     block_root*: Eth2Digest

beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim

@@ -51,6 +51,7 @@ RestJson.useDefaultSerializationFor(
   BLSToExecutionChange,
   BeaconBlockHeader,
   BlobSidecar,
+  BlobSidecarInfoObject,
   BlobsBundle,
   Checkpoint,
   ContributionAndProof,
@@ -299,6 +300,7 @@ const
 type
   EncodeTypes* =
     AttesterSlashing |
+    BlobSidecarInfoObject |
     DeleteKeystoresBody |
     EmptyBody |
     ImportDistributedKeystoresBody |
@@ -4145,6 +4147,8 @@ proc decodeString*(t: typedesc[EventTopic],
     ok(EventTopic.ProposerSlashing)
   of "attester_slashing":
     ok(EventTopic.AttesterSlashing)
+  of "blob_sidecar":
+    ok(EventTopic.BlobSidecar)
   of "finalized_checkpoint":
     ok(EventTopic.FinalizedCheckpoint)
   of "chain_reorg":
@@ -4174,6 +4178,8 @@ proc encodeString*(value: set[EventTopic]): Result[string, cstring] =
     res.add("proposer_slashing,")
   if EventTopic.AttesterSlashing in value:
     res.add("attester_slashing,")
+  if EventTopic.BlobSidecar in value:
+    res.add("blob_sidecar,")
   if EventTopic.FinalizedCheckpoint in value:
     res.add("finalized_checkpoint,")
   if EventTopic.ChainReorg in value:

beacon_chain/spec/eth2_apis/rest_types.nim

@@ -55,8 +55,9 @@ type
   # https://github.com/ethereum/beacon-APIs/blob/v2.4.2/apis/eventstream/index.yaml
   EventTopic* {.pure.} = enum
     Head, Block, Attestation, VoluntaryExit, BLSToExecutionChange,
-    ProposerSlashing, AttesterSlashing, FinalizedCheckpoint, ChainReorg,
-    ContributionAndProof, LightClientFinalityUpdate, LightClientOptimisticUpdate
+    ProposerSlashing, AttesterSlashing, BlobSidecar, FinalizedCheckpoint,
+    ChainReorg, ContributionAndProof, LightClientFinalityUpdate,
+    LightClientOptimisticUpdate
 
   EventTopics* = set[EventTopic]
 

ncli/validator_db_aggregator.nim

@@ -6,7 +6,7 @@
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
 import
-  std/[parsecsv, streams],
+  std/parsecsv,
   stew/[io2, byteutils], chronicles, confutils, snappy,
   ../beacon_chain/spec/datatypes/base,
   ./ncli_common
@@ -200,6 +200,8 @@ proc advanceEpochs*(aggregator: var ValidatorDbAggregator, epoch: Epoch,
   aggregator.epochsAggregated = 0
 
 when isMainModule:
+  import std/streams
+
   when defined(posix):
     import system/ansi_c