Parameters from the EIP-4844 specifications as defined at
https://eips.ethereum.org/EIPS/eip-4844#parameters
If the parameter is not currently used within the tests, it is commented
out.
Source code in tests/cancun/eip4844_blobs/spec.py
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124 | @dataclass(frozen=True)
class Spec:
"""
Parameters from the EIP-4844 specifications as defined at
https://eips.ethereum.org/EIPS/eip-4844#parameters
If the parameter is not currently used within the tests, it is commented
out.
"""
BLOB_TX_TYPE = 0x03
FIELD_ELEMENTS_PER_BLOB = 4096
BLS_MODULUS = 0x73EDA753299D7D483339D80809A1D80553BDA402FFFE5BFEFFFFFFFF00000001
BLOB_COMMITMENT_VERSION_KZG = 1
POINT_EVALUATION_PRECOMPILE_ADDRESS = 20
POINT_EVALUATION_PRECOMPILE_GAS = 50_000
MAX_DATA_GAS_PER_BLOCK = 786432
TARGET_DATA_GAS_PER_BLOCK = 393216
MIN_DATA_GASPRICE = 1
DATA_GASPRICE_UPDATE_FRACTION = 3338477
# MAX_VERSIONED_HASHES_LIST_SIZE = 2**24
# MAX_CALLDATA_SIZE = 2**24
# MAX_ACCESS_LIST_SIZE = 2**24
# MAX_ACCESS_LIST_STORAGE_KEYS = 2**24
# MAX_TX_WRAP_COMMITMENTS = 2**12
# LIMIT_BLOBS_PER_TX = 2**12
DATA_GAS_PER_BLOB = 2**17
HASH_OPCODE_BYTE = 0x49
HASH_GAS_COST = 3
@classmethod
def kzg_to_versioned_hash(
cls,
kzg_commitment: bytes | int, # 48 bytes
blob_commitment_version_kzg: Optional[bytes | int] = None,
) -> bytes:
"""
Calculates the versioned hash for a given KZG commitment.
"""
if blob_commitment_version_kzg is None:
blob_commitment_version_kzg = cls.BLOB_COMMITMENT_VERSION_KZG
if isinstance(kzg_commitment, int):
kzg_commitment = kzg_commitment.to_bytes(48, "big")
if isinstance(blob_commitment_version_kzg, int):
blob_commitment_version_kzg = blob_commitment_version_kzg.to_bytes(1, "big")
return blob_commitment_version_kzg + sha256(kzg_commitment).digest()[1:]
@classmethod
def fake_exponential(cls, factor: int, numerator: int, denominator: int) -> int:
"""
Used to calculate the data gas cost.
"""
i = 1
output = 0
numerator_accumulator = factor * denominator
while numerator_accumulator > 0:
output += numerator_accumulator
numerator_accumulator = (numerator_accumulator * numerator) // (denominator * i)
i += 1
return output // denominator
@classmethod
def calc_excess_data_gas(cls, parent: BlockHeaderDataGasFields) -> int:
"""
Calculate the excess data gas for a block given the excess data gas
and data gas used from the parent block header.
"""
if parent.excess_data_gas + parent.data_gas_used < cls.TARGET_DATA_GAS_PER_BLOCK:
return 0
else:
return parent.excess_data_gas + parent.data_gas_used - cls.TARGET_DATA_GAS_PER_BLOCK
# Note: Currently unused.
# @classmethod
# def get_total_data_gas(cls, tx: Transaction) -> int:
# """
# Calculate the total data gas for a transaction.
# """
# if tx.blob_versioned_hashes is None:
# return 0
# return cls.DATA_GAS_PER_BLOB * len(tx.blob_versioned_hashes)
@classmethod
def get_data_gasprice(cls, *, excess_data_gas: int) -> int:
"""
Calculate the data gas price from the excess.
"""
return cls.fake_exponential(
cls.MIN_DATA_GASPRICE,
excess_data_gas,
cls.DATA_GASPRICE_UPDATE_FRACTION,
)
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