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quite some changes

This commit is contained in:
Agnish Ghosh 2024-10-02 22:36:18 +05:30
parent a789bdfaa6
commit c0c04a9528
3 changed files with 83 additions and 54 deletions
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4
beacon_chain/nimbus_beacon_node.nim
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@ -1546,8 +1546,8 @@ proc tryReconstructingDataColumns* (self: BeaconNode,
# Reconstruct data column sidecars from recovered blobs
let reconstructedDataColumns = get_data_column_sidecars(signed_block, recovered_cps.get)
debugEcho "Reconstructed Data Columns len"
debugEcho reconstructedDataColumns.get.len
for data_column in reconstructedDataColumns.get:
debugEcho reconstructedDataColumns.len
for data_column in reconstructedDataColumns:
if data_column.index notin custodiedColumnIndices:
continue

2
beacon_chain/spec/datatypes/eip7594.nim
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@ -27,6 +27,8 @@ const
# The number of cells in an extended blob |
# RANDOM_CHALLENGE_KZG_CELL_BATCH_DOMAIN = 'RCKZGCBATCH__V1_'
KZG_COMMITMENTS_INCLUSION_PROOF_DEPTH* = 4
KZG_COMMITMENTS_INCLUSION_PROOF_DEPTH_GINDEX* = 27
type
BLSFieldElement* = KzgBytes32

123
beacon_chain/spec/eip7594_helpers.nim
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@ -247,97 +247,124 @@ proc compute_signed_block_header(signed_block: deneb.SignedBeaconBlock |
signature: signed_block.signature
)
# https://github.com/ethereum/consensus-specs/blob/bb8f3caafc92590cdcf2d14974adb602db9b5ca3/specs/_features/eip7594/das-core.md#get_data_column_sidecars
proc get_data_column_sidecars*(signed_block: deneb.TrustedSignedBeaconBlock |
deneb.SignedBeaconBlock |
electra.TrustedSignedBeaconBlock |
electra.SignedBeaconBlock,
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.6/specs/_features/eip7594/das-core.md#get_data_column_sidecars
proc get_data_column_sidecars*(signed_beacon_block: deneb.TrustedSignedBeaconBlock |
electra.TrustedSignedBeaconBlock,
cellsAndProofs: seq[CellsAndProofs]):
Result[seq[DataColumnSidecar], string] =
# Given a signed block and the cells/proofs associated with each blob
# in the block, assemble the sidecars which can be distributed to peers.
var
blck = signed_block.message
seq[DataColumnSidecar] =
## Given a trusted signed beacon block and the cells/proofs associated
## with each data column (thereby blob as well) corresponding to the block,
## this function assembles the sidecars which can be distributed to
## the peers post data column reconstruction at every slot start.
##
## Note: this function only accepts `TrustedSignedBeaconBlock` as
## during practice we would be computing cells and proofs from
## data columns only after retrieving them from the database, where
## they we were already verified and persisted.
template blck(): auto = signed_beacon_block.message
let
beacon_block_header =
BeaconBlockHeader(
slot: blck.slot,
proposer_index: blck.proposer_index,
parent_root: blck.parent_root,
state_root: blck.state_root,
body_root: hash_tree_root(blck.body))
signed_beacon_block_header =
compute_signed_block_header(signed_block)
kzg_incl_proof: array[4, Eth2Digest]
SignedBeaconBlockHeader(
message: beacon_block_header,
signature: signed_beacon_block.signature.toValidatorSig)
var sidecars = newSeqOfCap[DataColumnSidecar](CELLS_PER_EXT_BLOB)
if cellsAndProofs.len == 0:
return ok(sidecars)
var
sidecars =
newSeqOfCap[DataColumnSidecar](kzg_abi.CELLS_PER_EXT_BLOB)
for column_index in 0..<NUMBER_OF_COLUMNS:
var
column_cells: DataColumn
column_proofs: KzgProofs
column_cells: seq[KzgCell]
column_proofs: seq[KzgProof]
for i in 0..<cellsAndProofs.len:
discard column_cells.add(cellsAndProofs[i].cells)
discard column_proofs.add(cellsAndProofs[i].proofs)
column_cells.add(cellsAndProofs[i].cells)
column_proofs.add(cellsAndProofs[i].proofs)
var sidecar = DataColumnSidecar(
index: ColumnIndex(column_index),
column: column_cells,
column: DataColumn.init(column_cells),
kzg_commitments: blck.body.blob_kzg_commitments,
kzg_proofs: column_proofs,
kzg_proofs: KzgProofs.init(column_proofs),
signed_block_header: signed_beacon_block_header)
blck.body.build_proof(
27.GeneralizedIndex,
KZG_COMMITMENTS_INCLUSION_PROOF_DEPTH_GINDEX.GeneralizedIndex,
sidecar.kzg_commitments_inclusion_proof).expect("Valid gindex")
sidecars.add(sidecar)
ok(sidecars)
sidecars
# https://github.com/ethereum/consensus-specs/blob/5f48840f4d768bf0e0a8156a3ed06ec333589007/specs/_features/eip7594/das-core.md#get_data_column_sidecars
proc get_data_column_sidecars*(signed_block: deneb.SignedBeaconBlock |
# Alternative approach to `get_data_column_sidecars` by directly computing
# blobs from blob bundles
proc get_data_column_sidecars*(signed_beacon_block: deneb.SignedBeaconBlock |
electra.SignedBeaconBlock,
blobs: seq[KzgBlob]):
Result[seq[DataColumnSidecar], string] =
var
blck = signed_block.message
signed_beacon_block_header = compute_signed_block_header(signed_block)
kzg_incl_proof: array[4, Eth2Digest]
## Given a signed beacon block and the blobs corresponding to the block,
## this function assembles the sidecars which can be distributed to
## the peers post data column reconstruction at every slot start.
##
## Note: this function only accepts `SignedBeaconBlock` as
## during practice we would be extracting data columns
## before publishing them, all of this happens during block
## production, hence the blocks are yet untrusted and have not
## yet been verified.
template blck(): auto = signed_beacon_block.message
let
beacon_block_header =
BeaconBlockHeader(
slot: blck.slot,
proposer_index: blck.proposer_index,
parent_root: blck.parent_root,
state_root: blck.state_root,
body_root: hash_tree_root(blck.body))
var sidecars = newSeqOfCap[DataColumnSidecar](CELLS_PER_EXT_BLOB)
if blobs.len == 0:
return ok(sidecars)
signed_beacon_block_header =
SignedBeaconBlockHeader(
message: beacon_block_header,
signature: signed_beacon_block.signature)
var
sidecars =
newSeqOfCap[DataColumnSidecar](eip7594.CELLS_PER_EXT_BLOB)
cells = newSeq[CellBytes](blobs.len)
proofs = newSeq[ProofBytes](blobs.len)
for i in 0..<blobs.len:
let
cell_and_proof = computeCellsAndProofs(blobs[i])
cell_and_proof = computeCellsAndKzgProofs(blobs[i])
if cell_and_proof.isErr():
return err("EIP7549: Could not compute cells")
cells[i] = cell_and_proof.get.cells
proofs[i] = cell_and_proof.get.proofs
let blobCount = blobs.len
for columnIndex in 0..<CELLS_PER_EXT_BLOB:
for columnIndex in 0..<eip7594.CELLS_PER_EXT_BLOB:
var
column: DataColumn
kzgProofOfColumn: KzgProofs
for rowIndex in 0..<blobCount:
discard column.add(cells[rowIndex][columnIndex])
for rowIndex in 0..<blobCount:
discard kzgProofOfColumn.add(proofs[rowIndex][columnIndex])
column: seq[KzgCell]
kzgProofOfColumn: seq[KzgProof]
for rowIndex in 0..<blobs.len:
column.add(cells[rowIndex][columnIndex])
kzgProofOfColumn.add(proofs[rowIndex][columnIndex])
var sidecar = DataColumnSidecar(
index: ColumnIndex(columnIndex),
column: DataColumn(column),
column: DataColumn.init(column),
kzg_commitments: blck.body.blob_kzg_commitments,
kzg_proofs: KzgProofs(kzgProofOfColumn),
kzg_proofs: KzgProofs.init(kzgProofOfColumn),
signed_block_header: signed_beacon_block_header)
blck.body.build_proof(
27.GeneralizedIndex,
KZG_COMMITMENTS_INCLUSION_PROOF_DEPTH_GINDEX.GeneralizedIndex,
sidecar.kzg_commitments_inclusion_proof).expect("Valid gindex")
sidecars.add(sidecar)
ok(sidecars)
# Helper function to `verifyCellKzgProofBatch` at https://github.com/ethereum/c-kzg-4844/blob/das/bindings/nim/kzg_ex.nim#L170