constants.py

from typing import (
    List,
    Optional,
)

from eth_typing import (
    Address,
    BlockNumber,
    Hash32,
)
from eth_utils import (
    denoms,
)

ANY = "any"
UINT256 = "uint256"
BYTES = "bytes"

UINT_256_MAX = 2**256 - 1
UINT_256_CEILING = 2**256
UINT_255_MAX = 2**255 - 1
UINT_255_CEILING = 2**255
UINT_255_NEGATIVE_ONE = -1 + UINT_256_CEILING
UINT_64_MAX = 2**64 - 1
NULL_BYTE = b"\x00"
EMPTY_WORD = NULL_BYTE * 32

UINT_160_CEILING = 2**160

CREATE_CONTRACT_ADDRESS = Address(b"")
ZERO_ADDRESS = Address(20 * b"\x00")
ZERO_HASH32 = Hash32(32 * b"\x00")

#
# POW Constants
#
EPOCH_LENGTH = 30000

#
# Stack Limit
#
STACK_DEPTH_LIMIT = 1024


#
# Gas Costs and Refunds
#
GAS_NULL = 0
GAS_ZERO = 0
GAS_BASE = 2
GAS_VERYLOW = 3
GAS_LOW = 5
GAS_MID = 8
GAS_HIGH = 10
GAS_EXTCODE = 20
GAS_BALANCE = 20
GAS_SLOAD = 50
GAS_JUMPDEST = 1
GAS_SSET = 20000
GAS_SRESET = 5000

REFUND_SCLEAR = 15000

GAS_SELFDESTRUCT = 0
GAS_SELFDESTRUCT_NEWACCOUNT = 25000
GAS_CREATE = 32000
GAS_CALL = 40
GAS_CALLVALUE = 9000
GAS_CALLSTIPEND = 2300
GAS_NEWACCOUNT = 25000
GAS_EXP = 10
GAS_EXPBYTE = 10
GAS_MEMORY = 3
GAS_TXCREATE = 32000
GAS_TXDATAZERO = 4
GAS_TXDATANONZERO = 68
GAS_TX = 21000
GAS_LOG = 375
GAS_LOGDATA = 8
GAS_LOGTOPIC = 375
GAS_SHA3 = 30
GAS_SHA3WORD = 6
GAS_COPY = 3
GAS_BLOCKHASH = 20
GAS_CODEDEPOSIT = 200

GAS_MEMORY_QUADRATIC_DENOMINATOR = 512


#
# Pre-compile contract gas costs
#
GAS_SHA256 = 60
GAS_SHA256WORD = 12

GAS_RIPEMD160 = 600
GAS_RIPEMD160WORD = 120

GAS_IDENTITY = 15
GAS_IDENTITYWORD = 3

GAS_ECRECOVER = 3000

GAS_ECADD = 500
GAS_ECMUL = 40000

GAS_ECPAIRING_BASE = 100000
GAS_ECPAIRING_PER_POINT = 80000


#
# Gas Limit
#
GAS_LIMIT_EMA_DENOMINATOR = 1024
GAS_LIMIT_ADJUSTMENT_FACTOR = 1024
GAS_LIMIT_MINIMUM = 5000
GAS_LIMIT_MAXIMUM = 2**63 - 1

GAS_LIMIT_USAGE_ADJUSTMENT_NUMERATOR = 3
GAS_LIMIT_USAGE_ADJUSTMENT_DENOMINATOR = 2


#
# Difficulty
#
DIFFICULTY_ADJUSTMENT_DENOMINATOR = 2048
DIFFICULTY_MINIMUM = 131072

BOMB_EXPONENTIAL_PERIOD = 100000
BOMB_EXPONENTIAL_FREE_PERIODS = 2

#
# Mining
#
BLOCK_REWARD = 5 * denoms.ether

UNCLE_DEPTH_PENALTY_FACTOR = 8
MAX_UNCLE_DEPTH = 6
MAX_UNCLES = 2

#
# SECPK1N
#
SECPK1_P = 2**256 - 2**32 - 977
SECPK1_N = (
    115792089237316195423570985008687907852837564279074904382605163141518161494337
)
SECPK1_A = 0
SECPK1_B = 7
SECPK1_Gx = (
    55066263022277343669578718895168534326250603453777594175500187360389116729240
)
SECPK1_Gy = (
    32670510020758816978083085130507043184471273380659243275938904335757337482424
)
SECPK1_G = (SECPK1_Gx, SECPK1_Gy)


#
# Block and Header
#
# keccak(rlp.encode([]))
EMPTY_UNCLE_HASH = Hash32(
    b"\x1d\xccM\xe8\xde\xc7]z\xab\x85\xb5g\xb6\xcc\xd4\x1a\xd3\x12E\x1b\x94\x8at\x13\xf0\xa1B\xfd@\xd4\x93G"  # noqa: E501
)


#
# Genesis Data
#
GENESIS_BLOCK_NUMBER = BlockNumber(0)
GENESIS_DIFFICULTY = 17179869184
GENESIS_GAS_LIMIT = 5000
GENESIS_PARENT_HASH = ZERO_HASH32
GENESIS_COINBASE = ZERO_ADDRESS
GENESIS_NONCE = b"\x00\x00\x00\x00\x00\x00\x00B"  # 0x42 encoded as big-endian-integer
GENESIS_MIX_HASH = ZERO_HASH32
GENESIS_EXTRA_DATA = b""
GENESIS_BLOOM = 0
GENESIS_GAS_USED = 0

#
# Sha3 Keccak
#
EMPTY_SHA3 = Hash32(
    b"\xc5\xd2F\x01\x86\xf7#<\x92~}\xb2\xdc\xc7\x03\xc0\xe5\x00\xb6S\xca\x82';\x7b\xfa\xd8\x04]\x85\xa4p"  # noqa: E501
)
BLANK_ROOT_HASH = Hash32(
    b"V\xe8\x1f\x17\x1b\xccU\xa6\xff\x83E\xe6\x92\xc0\xf8n\x5bH\xe0\x1b\x99l\xad\xc0\x01b/\xb5\xe3c\xb4!"  # noqa: E501
)


GAS_MOD_EXP_QUADRATIC_DENOMINATOR = 20

#
# BLOCKHASH opcode maximum depth
#
MAX_PREV_HEADER_DEPTH = 256

#
# Call overrides
#
DEFAULT_SPOOF_Y_PARITY = 1
DEFAULT_SPOOF_R = 1
DEFAULT_SPOOF_S = 1


#
# Merge / EIP-3675 constants
#
POST_MERGE_OMMERS_HASH = EMPTY_UNCLE_HASH
POST_MERGE_DIFFICULTY = 0
POST_MERGE_MIX_HASH = ZERO_HASH32
POST_MERGE_NONCE = b"\x00\x00\x00\x00\x00\x00\x00\x00"
POST_MERGE_OMMERS: List[Optional[Hash32]] = []