nimbus-eth2/beacon_chain/spec/helpers.nim

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2018-07-23 12:58:41 +00:00
# beacon_chain
# Copyright (c) 2018-2024 Status Research & Development GmbH
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# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [].}
# Uncategorized helper functions from the spec
import
# Status libraries
stew/[byteutils, endians2, objects],
nimcrypto/sha2,
chronicles,
eth/common/[eth_types, eth_types_rlp],
eth/rlp, eth/trie/ordered_trie,
# Internal
"."/[eth2_merkleization, forks, ssz_codec]
disentangle eth2 types from the ssz library (#2785) * reorganize ssz dependencies This PR continues the work in https://github.com/status-im/nimbus-eth2/pull/2646, https://github.com/status-im/nimbus-eth2/pull/2779 as well as past issues with serialization and type, to disentangle SSZ from eth2 and at the same time simplify imports and exports with a structured approach. The principal idea here is that when a library wants to introduce SSZ support, they do so via 3 files: * `ssz_codecs` which imports and reexports `codecs` - this covers the basic byte conversions and ensures no overloads get lost * `xxx_merkleization` imports and exports `merkleization` to specialize and get access to `hash_tree_root` and friends * `xxx_ssz_serialization` imports and exports `ssz_serialization` to specialize ssz for a specific library Those that need to interact with SSZ always import the `xxx_` versions of the modules and never `ssz` itself so as to keep imports simple and safe. This is similar to how the REST / JSON-RPC serializers are structured in that someone wanting to serialize spec types to REST-JSON will import `eth2_rest_serialization` and nothing else. * split up ssz into a core library that is independendent of eth2 types * rename `bytes_reader` to `codec` to highlight that it contains coding and decoding of bytes and native ssz types * remove tricky List init overload that causes compile issues * get rid of top-level ssz import * reenable merkleization tests * move some "standard" json serializers to spec * remove `ValidatorIndex` serialization for now * remove test_ssz_merkleization * add tests for over/underlong byte sequences * fix broken seq[byte] test - seq[byte] is not an SSZ type There are a few things this PR doesn't solve: * like #2646 this PR is weak on how to handle root and other dontSerialize fields that "sometimes" should be computed - the same problem appears in REST / JSON-RPC etc * Fix a build problem on macOS * Another way to fix the macOS builds Co-authored-by: Zahary Karadjov <zahary@gmail.com>
2021-08-18 18:57:58 +00:00
# TODO although eth2_merkleization already exports ssz_codec, *sometimes* code
# fails to compile if the export is not done here also. Exporting rlp avoids a
# generics sandwich where rlp/writer.append() is not seen, by a caller outside
# this module via compute_execution_block_hash() called from block_processor.
disentangle eth2 types from the ssz library (#2785) * reorganize ssz dependencies This PR continues the work in https://github.com/status-im/nimbus-eth2/pull/2646, https://github.com/status-im/nimbus-eth2/pull/2779 as well as past issues with serialization and type, to disentangle SSZ from eth2 and at the same time simplify imports and exports with a structured approach. The principal idea here is that when a library wants to introduce SSZ support, they do so via 3 files: * `ssz_codecs` which imports and reexports `codecs` - this covers the basic byte conversions and ensures no overloads get lost * `xxx_merkleization` imports and exports `merkleization` to specialize and get access to `hash_tree_root` and friends * `xxx_ssz_serialization` imports and exports `ssz_serialization` to specialize ssz for a specific library Those that need to interact with SSZ always import the `xxx_` versions of the modules and never `ssz` itself so as to keep imports simple and safe. This is similar to how the REST / JSON-RPC serializers are structured in that someone wanting to serialize spec types to REST-JSON will import `eth2_rest_serialization` and nothing else. * split up ssz into a core library that is independendent of eth2 types * rename `bytes_reader` to `codec` to highlight that it contains coding and decoding of bytes and native ssz types * remove tricky List init overload that causes compile issues * get rid of top-level ssz import * reenable merkleization tests * move some "standard" json serializers to spec * remove `ValidatorIndex` serialization for now * remove test_ssz_merkleization * add tests for over/underlong byte sequences * fix broken seq[byte] test - seq[byte] is not an SSZ type There are a few things this PR doesn't solve: * like #2646 this PR is weak on how to handle root and other dontSerialize fields that "sometimes" should be computed - the same problem appears in REST / JSON-RPC etc * Fix a build problem on macOS * Another way to fix the macOS builds Co-authored-by: Zahary Karadjov <zahary@gmail.com>
2021-08-18 18:57:58 +00:00
export
eth2_merkleization, forks, ssz_codec, rlp, eth_types_rlp.append
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# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.9/specs/phase0/weak-subjectivity.md#constants
const ETH_TO_GWEI = 1_000_000_000.Gwei
func toEther*(gwei: Gwei): Ether =
(gwei div ETH_TO_GWEI).Ether
func toGwei*(eth: Ether): Gwei =
distinctBase(eth) * ETH_TO_GWEI
type
FinalityCheckpoints* = object
justified*: Checkpoint
finalized*: Checkpoint
func shortLog*(v: FinalityCheckpoints): auto =
(
justified: shortLog(v.justified),
finalized: shortLog(v.finalized)
)
chronicles.formatIt FinalityCheckpoints: it.shortLog
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.7/specs/phase0/beacon-chain.md#integer_squareroot
func integer_squareroot*(n: SomeInteger): SomeInteger =
## Return the largest integer ``x`` such that ``x**2 <= n``.
doAssert n >= 0'u64
if n == high(uint64):
return 4294967295'u64
var
x = n
y = (x + 1) div 2
while y < x:
x = y
y = (x + n div x) div 2
x
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.7/specs/phase0/beacon-chain.md#is_active_validator
func is_active_validator*(validator: Validator, epoch: Epoch): bool =
## Check if ``validator`` is active.
validator.activation_epoch <= epoch and epoch < validator.exit_epoch
func is_exited_validator*(validator: Validator, epoch: Epoch): bool =
## Check if ``validator`` is exited.
validator.exit_epoch <= epoch
func is_withdrawable_validator*(validator: Validator, epoch: Epoch): bool =
epoch >= validator.withdrawable_epoch
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#get_active_validator_indices
iterator get_active_validator_indices*(state: ForkyBeaconState, epoch: Epoch):
ValidatorIndex =
for vidx in state.validators.vindices:
if is_active_validator(state.validators[vidx], epoch):
yield vidx
func get_active_validator_indices*(state: ForkyBeaconState, epoch: Epoch):
seq[ValidatorIndex] =
## Return the sequence of active validator indices at ``epoch``.
var res = newSeqOfCap[ValidatorIndex](state.validators.len)
for vidx in get_active_validator_indices(state, epoch):
res.add vidx
res
func get_active_validator_indices_len*(state: ForkyBeaconState, epoch: Epoch):
uint64 =
for vidx in state.validators.vindices:
if is_active_validator(state.validators.item(vidx), epoch):
inc result
func get_active_validator_indices_len*(
state: ForkedHashedBeaconState; epoch: Epoch): uint64 =
withState(state):
get_active_validator_indices_len(forkyState.data, epoch)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#get_current_epoch
func get_current_epoch*(state: ForkyBeaconState): Epoch =
## Return the current epoch.
state.slot.epoch
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#get_current_epoch
func get_current_epoch*(state: ForkedHashedBeaconState): Epoch =
## Return the current epoch.
withState(state): get_current_epoch(forkyState.data)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#get_previous_epoch
func get_previous_epoch*(
state: ForkyBeaconState | ForkedHashedBeaconState): Epoch =
## Return the previous epoch (unless the current epoch is ``GENESIS_EPOCH``).
get_previous_epoch(get_current_epoch(state))
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#get_randao_mix
func get_randao_mix*(state: ForkyBeaconState, epoch: Epoch): Eth2Digest =
## Return the randao mix at a recent ``epoch``.
state.randao_mixes[epoch mod EPOCHS_PER_HISTORICAL_VECTOR]
func bytes_to_uint32*(data: openArray[byte]): uint32 =
doAssert data.len == 4
# Little-endian data representation
uint32.fromBytesLE(data)
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func bytes_to_uint64*(data: openArray[byte]): uint64 =
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doAssert data.len == 8
# Little-endian data representation
uint64.fromBytesLE(data)
func uint_to_bytes*(x: uint64): array[8, byte] = toBytesLE(x)
func uint_to_bytes*(x: uint32): array[4, byte] = toBytesLE(x)
func uint_to_bytes*(x: uint16): array[2, byte] = toBytesLE(x)
func uint_to_bytes*(x: uint8): array[1, byte] = toBytesLE(x)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.7/specs/phase0/beacon-chain.md#compute_domain
func compute_domain*(
domain_type: DomainType,
fork_version: Version,
genesis_validators_root: Eth2Digest = ZERO_HASH): Eth2Domain =
## Return the domain for the ``domain_type`` and ``fork_version``.
#
# TODO toOpenArray can't be used from JavaScript backend
# https://github.com/nim-lang/Nim/issues/15952
let fork_data_root =
compute_fork_data_root(fork_version, genesis_validators_root)
result[0..3] = domain_type.data
result[4..31] = fork_data_root.data.toOpenArray(0, 27)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.8/specs/phase0/beacon-chain.md#get_domain
func get_domain*(
fork: Fork,
domain_type: DomainType,
epoch: Epoch,
genesis_validators_root: Eth2Digest): Eth2Domain =
## Return the signature domain (fork version concatenated with domain type)
## of a message.
let fork_version =
if epoch < fork.epoch:
fork.previous_version
else:
fork.current_version
compute_domain(domain_type, fork_version, genesis_validators_root)
func get_domain*(
state: ForkyBeaconState, domain_type: DomainType, epoch: Epoch): Eth2Domain =
## Return the signature domain (fork version concatenated with domain type)
## of a message.
get_domain(state.fork, domain_type, epoch, state.genesis_validators_root)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#compute_signing_root
func compute_signing_root*(ssz_object: auto, domain: Eth2Domain): Eth2Digest =
## Return the signing root for the corresponding signing data.
let domain_wrapped_object = SigningData(
object_root: hash_tree_root(ssz_object),
domain: domain
)
hash_tree_root(domain_wrapped_object)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.8/specs/phase0/beacon-chain.md#get_seed
func get_seed*(
state: ForkyBeaconState, epoch: Epoch, domain_type: DomainType,
mix: Eth2Digest): Eth2Digest =
## Return the seed at ``epoch``.
var seed_input : array[4+8+32, byte]
seed_input[0..3] = domain_type.data
seed_input[4..11] = uint_to_bytes(epoch.uint64)
seed_input[12..43] = mix.data
eth2digest(seed_input)
func get_seed*(state: ForkyBeaconState, epoch: Epoch, domain_type: DomainType):
Eth2Digest =
# Detect potential underflow
static: doAssert EPOCHS_PER_HISTORICAL_VECTOR > MIN_SEED_LOOKAHEAD
let mix = get_randao_mix(state, # Avoid underflow
epoch + EPOCHS_PER_HISTORICAL_VECTOR - MIN_SEED_LOOKAHEAD - 1)
state.get_seed(epoch, domain_type, mix)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.9/specs/altair/beacon-chain.md#add_flag
func add_flag*(flags: ParticipationFlags, flag_index: TimelyFlag): ParticipationFlags =
let flag = ParticipationFlags(1'u8 shl ord(flag_index))
flags or flag
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#has_flag
func has_flag*(flags: ParticipationFlags, flag_index: TimelyFlag): bool =
let flag = ParticipationFlags(1'u8 shl ord(flag_index))
(flags and flag) == flag
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# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.8/specs/deneb/p2p-interface.md#verify_blob_sidecar_inclusion_proof
func verify_blob_sidecar_inclusion_proof*(
blob_sidecar: BlobSidecar): Result[void, string] =
let gindex = kzg_commitment_inclusion_proof_gindex(blob_sidecar.index)
if not is_valid_merkle_branch(
hash_tree_root(blob_sidecar.kzg_commitment),
blob_sidecar.kzg_commitment_inclusion_proof,
KZG_COMMITMENT_INCLUSION_PROOF_DEPTH,
get_subtree_index(gindex),
blob_sidecar.signed_block_header.message.body_root):
return err("BlobSidecar: inclusion proof not valid")
ok()
func create_blob_sidecars*(
forkyBlck: deneb.SignedBeaconBlock | electra.SignedBeaconBlock |
fulu.SignedBeaconBlock,
kzg_proofs: KzgProofs,
blobs: Blobs): seq[BlobSidecar] =
template kzg_commitments: untyped =
forkyBlck.message.body.blob_kzg_commitments
doAssert kzg_proofs.len == blobs.len
doAssert kzg_proofs.len == kzg_commitments.len
var res = newSeqOfCap[BlobSidecar](blobs.len)
let signedBlockHeader = forkyBlck.toSignedBeaconBlockHeader()
for i in 0 ..< blobs.lenu64:
var sidecar = BlobSidecar(
index: i,
blob: blobs[i],
kzg_commitment: kzg_commitments[i],
kzg_proof: kzg_proofs[i],
signed_block_header: signedBlockHeader)
forkyBlck.message.body.build_proof(
kzg_commitment_inclusion_proof_gindex(i),
sidecar.kzg_commitment_inclusion_proof).expect("Valid gindex")
res.add(sidecar)
res
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.5/specs/altair/light-client/sync-protocol.md#is_sync_committee_update
template is_sync_committee_update*(update: SomeForkyLightClientUpdate): bool =
when update is SomeForkyLightClientUpdateWithSyncCommittee:
update.next_sync_committee_branch !=
static(default(typeof(update.next_sync_committee_branch)))
else:
false
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.5/specs/altair/light-client/sync-protocol.md#is_finality_update
template is_finality_update*(update: SomeForkyLightClientUpdate): bool =
when update is SomeForkyLightClientUpdateWithFinality:
update.finality_branch !=
static(default(typeof(update.finality_branch)))
else:
false
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.3/specs/altair/light-client/sync-protocol.md#is_next_sync_committee_known
template is_next_sync_committee_known*(store: ForkyLightClientStore): bool =
store.next_sync_committee !=
static(default(typeof(store.next_sync_committee)))
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/altair/light-client/sync-protocol.md#get_safety_threshold
func get_safety_threshold*(store: ForkyLightClientStore): uint64 =
max(
store.previous_max_active_participants,
store.current_max_active_participants
) div 2
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/altair/light-client/sync-protocol.md#is_better_update
type LightClientUpdateMetadata* = object
attested_slot*, finalized_slot*, signature_slot*: Slot
has_sync_committee*, has_finality*: bool
num_active_participants*: uint64
func toMeta*(update: SomeForkyLightClientUpdate): LightClientUpdateMetadata =
var meta {.noinit.}: LightClientUpdateMetadata
meta.attested_slot =
update.attested_header.beacon.slot
meta.finalized_slot =
when update is SomeForkyLightClientUpdateWithFinality:
update.finalized_header.beacon.slot
else:
GENESIS_SLOT
meta.signature_slot =
update.signature_slot
meta.has_sync_committee =
when update is SomeForkyLightClientUpdateWithSyncCommittee:
update.is_sync_committee_update
else:
false
meta.has_finality =
when update is SomeForkyLightClientUpdateWithFinality:
update.is_finality_update
else:
false
meta.num_active_participants =
update.sync_aggregate.num_active_participants.uint64
meta
template toMeta*(
update: SomeForkedLightClientUpdate): LightClientUpdateMetadata =
withForkyObject(update):
when lcDataFork > LightClientDataFork.None:
forkyObject.toMeta()
else:
default(LightClientUpdateMetadata)
func is_better_data*(new_meta, old_meta: LightClientUpdateMetadata): bool =
# Compare supermajority (> 2/3) sync committee participation
let
new_has_supermajority =
hasSupermajoritySyncParticipation(new_meta.num_active_participants)
old_has_supermajority =
hasSupermajoritySyncParticipation(old_meta.num_active_participants)
if new_has_supermajority != old_has_supermajority:
return new_has_supermajority > old_has_supermajority
if not new_has_supermajority:
if new_meta.num_active_participants != old_meta.num_active_participants:
return new_meta.num_active_participants > old_meta.num_active_participants
# Compare presence of relevant sync committee
let
new_has_relevant_sync_committee = new_meta.has_sync_committee and
new_meta.attested_slot.sync_committee_period ==
new_meta.signature_slot.sync_committee_period
old_has_relevant_sync_committee = old_meta.has_sync_committee and
old_meta.attested_slot.sync_committee_period ==
old_meta.signature_slot.sync_committee_period
if new_has_relevant_sync_committee != old_has_relevant_sync_committee:
return new_has_relevant_sync_committee > old_has_relevant_sync_committee
# Compare indication of any finality
if new_meta.has_finality != old_meta.has_finality:
return new_meta.has_finality > old_meta.has_finality
# Compare sync committee finality
if new_meta.has_finality:
let
new_has_sync_committee_finality =
new_meta.finalized_slot.sync_committee_period ==
new_meta.attested_slot.sync_committee_period
old_has_sync_committee_finality =
old_meta.finalized_slot.sync_committee_period ==
old_meta.attested_slot.sync_committee_period
if new_has_sync_committee_finality != old_has_sync_committee_finality:
return new_has_sync_committee_finality > old_has_sync_committee_finality
# Tiebreaker 1: Sync committee participation beyond supermajority
if new_meta.num_active_participants != old_meta.num_active_participants:
return new_meta.num_active_participants > old_meta.num_active_participants
# Tiebreaker 2: Prefer older data (fewer changes to best data)
new_meta.attested_slot < old_meta.attested_slot
template is_better_update*[
A, B: SomeForkyLightClientUpdate | ForkedLightClientUpdate](
new_update: A, old_update: B): bool =
is_better_data(toMeta(new_update), toMeta(old_update))
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
func contextEpoch*(bootstrap: ForkyLightClientBootstrap): Epoch =
bootstrap.header.beacon.slot.epoch
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
func contextEpoch*(update: SomeForkyLightClientUpdate): Epoch =
update.attested_header.beacon.slot.epoch
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.8/specs/bellatrix/beacon-chain.md#is_merge_transition_complete
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func is_merge_transition_complete*(
state: bellatrix.BeaconState | capella.BeaconState | deneb.BeaconState |
electra.BeaconState | fulu.BeaconState): bool =
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const defaultExecutionPayloadHeader =
default(typeof(state.latest_execution_payload_header))
state.latest_execution_payload_header != defaultExecutionPayloadHeader
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.9/sync/optimistic.md#helpers
func is_execution_block*(blck: SomeForkyBeaconBlock): bool =
when typeof(blck).kind >= ConsensusFork.Bellatrix:
const defaultExecutionPayload =
default(typeof(blck.body.execution_payload))
blck.body.execution_payload != defaultExecutionPayload
else:
false
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.8/specs/bellatrix/beacon-chain.md#is_merge_transition_block
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func is_merge_transition_block(
state: bellatrix.BeaconState | capella.BeaconState | deneb.BeaconState |
electra.BeaconState | fulu.BeaconState,
body: bellatrix.BeaconBlockBody | bellatrix.TrustedBeaconBlockBody |
bellatrix.SigVerifiedBeaconBlockBody |
capella.BeaconBlockBody | capella.TrustedBeaconBlockBody |
capella.SigVerifiedBeaconBlockBody |
deneb.BeaconBlockBody | deneb.TrustedBeaconBlockBody |
deneb.SigVerifiedBeaconBlockBody |
electra.BeaconBlockBody | electra.TrustedBeaconBlockBody |
electra.SigVerifiedBeaconBlockBody |
fulu.BeaconBlockBody | fulu.TrustedBeaconBlockBody |
fulu.SigVerifiedBeaconBlockBody): bool =
const defaultExecutionPayload = default(typeof(body.execution_payload))
not is_merge_transition_complete(state) and
body.execution_payload != defaultExecutionPayload
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.8/specs/bellatrix/beacon-chain.md#is_execution_enabled
func is_execution_enabled*(
state: bellatrix.BeaconState | capella.BeaconState | deneb.BeaconState |
electra.BeaconState | fulu.BeaconState,
body: bellatrix.BeaconBlockBody | bellatrix.TrustedBeaconBlockBody |
bellatrix.SigVerifiedBeaconBlockBody |
capella.BeaconBlockBody | capella.TrustedBeaconBlockBody |
capella.SigVerifiedBeaconBlockBody |
deneb.BeaconBlockBody | deneb.TrustedBeaconBlockBody |
deneb.SigVerifiedBeaconBlockBody |
electra.BeaconBlockBody | electra.TrustedBeaconBlockBody |
electra.SigVerifiedBeaconBlockBody |
fulu.BeaconBlockBody | fulu.TrustedBeaconBlockBody |
fulu.SigVerifiedBeaconBlockBody): bool =
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is_merge_transition_block(state, body) or is_merge_transition_complete(state)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.8/specs/bellatrix/beacon-chain.md#compute_timestamp_at_slot
func compute_timestamp_at_slot*(state: ForkyBeaconState, slot: Slot): uint64 =
# Note: This function is unsafe with respect to overflows and underflows.
let slots_since_genesis = slot - GENESIS_SLOT
state.genesis_time + slots_since_genesis * SECONDS_PER_SLOT
template append*(w: var RlpWriter, v: bellatrix.Transaction) =
w.appendRawBytes(distinctBase v)
template append*(w: var RlpWriter, withdrawal: capella.Withdrawal) =
w.appendRecordType(EthWithdrawal(
index: withdrawal.index,
validatorIndex: withdrawal.validator_index,
address: EthAddress withdrawal.address.data,
amount: distinctBase(withdrawal.amount)))
proc computeTransactionsTrieRoot(
payload: ForkyExecutionPayload): EthHash32 =
orderedTrieRoot(payload.transactions.asSeq)
# https://eips.ethereum.org/EIPS/eip-7685
func computeRequestsHash(
requests: electra.ExecutionRequests): EthHash32 =
const
DEPOSIT_REQUEST_TYPE = 0x00'u8 # EIP-6110
WITHDRAWAL_REQUEST_TYPE = 0x01'u8 # EIP-7002
CONSOLIDATION_REQUEST_TYPE = 0x02'u8 # EIP-7251
template individualHash(requestType, requestList): Digest =
computeDigest:
h.update([requestType.byte])
for request in requestList:
h.update SSZ.encode(request)
let requestsHash = computeDigest:
template mixInRequests(requestType, requestList): untyped =
if requestList.len > 0:
h.update(individualHash(requestType, requestList).data)
static:
doAssert DEPOSIT_REQUEST_TYPE < WITHDRAWAL_REQUEST_TYPE
doAssert WITHDRAWAL_REQUEST_TYPE < CONSOLIDATION_REQUEST_TYPE
mixInRequests(DEPOSIT_REQUEST_TYPE, requests.deposits)
mixInRequests(WITHDRAWAL_REQUEST_TYPE, requests.withdrawals)
mixInRequests(CONSOLIDATION_REQUEST_TYPE, requests.consolidations)
requestsHash.to(EthHash32)
proc blockToBlockHeader*(blck: ForkyBeaconBlock): EthHeader =
template payload: auto = blck.body.execution_payload
static: # `GasInt` is signed. We only use it for hashing.
doAssert sizeof(GasInt) == sizeof(payload.gas_limit)
doAssert sizeof(GasInt) == sizeof(payload.gas_used)
let
txRoot = payload.computeTransactionsTrieRoot()
withdrawalsRoot =
when typeof(payload).kind >= ConsensusFork.Capella:
Opt.some orderedTrieRoot(payload.withdrawals.asSeq)
else:
Opt.none(EthHash32)
blobGasUsed =
when typeof(payload).kind >= ConsensusFork.Deneb:
Opt.some payload.blob_gas_used
else:
Opt.none(uint64)
excessBlobGas =
when typeof(payload).kind >= ConsensusFork.Deneb:
Opt.some payload.excess_blob_gas
else:
Opt.none(uint64)
parentBeaconBlockRoot =
when typeof(payload).kind >= ConsensusFork.Deneb:
Opt.some EthHash32(blck.parent_root.data)
else:
Opt.none(EthHash32)
requestsHash =
when typeof(payload).kind >= ConsensusFork.Electra:
Opt.some blck.body.execution_requests.computeRequestsHash()
else:
Opt.none(EthHash32)
EthHeader(
parentHash : payload.parent_hash.to(Hash32),
ommersHash : EMPTY_UNCLE_HASH,
coinbase : EthAddress payload.fee_recipient.data,
stateRoot : payload.state_root.to(Root),
transactionsRoot : txRoot,
receiptsRoot : payload.receipts_root.to(Root),
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logsBloom : Bloom payload.logs_bloom.data.to(Bloom),
difficulty : default(DifficultyInt),
number : payload.block_number,
gasLimit : payload.gas_limit,
gasUsed : payload.gas_used,
timestamp : EthTime(payload.timestamp),
extraData : payload.extra_data.asSeq,
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mixHash : Bytes32 payload.prev_randao.data, # EIP-4399 `mixHash` -> `prevRandao`
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nonce : default(Bytes8),
baseFeePerGas : Opt.some payload.base_fee_per_gas,
withdrawalsRoot : withdrawalsRoot,
blobGasUsed : blobGasUsed, # EIP-4844
excessBlobGas : excessBlobGas, # EIP-4844
parentBeaconBlockRoot : parentBeaconBlockRoot, # EIP-4788
requestsHash : requestsHash) # EIP-7685
proc compute_execution_block_hash*(blck: ForkyBeaconBlock): Eth2Digest =
rlpHash(blockToBlockHeader(blck)).to(Eth2Digest)
from std/math import exp, ln
from std/sequtils import foldl
func ln_binomial(n, k: int): float64 =
if k > n:
low(float64)
else:
template ln_factorial(n: int): float64 =
(2 .. n).foldl(a + ln(b.float64), 0.0)
ln_factorial(n) - ln_factorial(k) - ln_factorial(n - k)
func hypergeom_cdf*(k: int, population: int, successes: int, draws: int):
float64 =
if k < draws + successes - population:
0.0
elif k >= min(successes, draws):
1.0
else:
let ln_denom = ln_binomial(population, draws)
(0 .. k).foldl(a + exp(
ln_binomial(successes, b) +
ln_binomial(population - successes, draws - b) - ln_denom), 0.0)