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# beacon_chain
# Copyright (c) 2018-2022 Status Research & Development GmbH
# 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).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [Defect].}
import
std/[macros, strutils, parseutils, tables],
stew/[byteutils], stint, web3/[ethtypes]
const
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#withdrawal-prefixes
BLS_WITHDRAWAL_PREFIX*: byte = 0
ETH1_ADDRESS_WITHDRAWAL_PREFIX*: byte = 1
# Constants from `validator.md` not covered by config/presets in the spec
TARGET_AGGREGATORS_PER_COMMITTEE*: uint64 = 16
RANDOM_SUBNETS_PER_VALIDATOR*: uint64 = 1
EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION*: uint64 = 256
type
Slot* = distinct uint64
Epoch* = distinct uint64
SyncCommitteePeriod* = distinct uint64
Version* = distinct array[4, byte]
Eth1Address* = ethtypes.Address
RuntimeConfig* = object
## https://github.com/ethereum/consensus-specs/tree/v1.1.10/configs
PRESET_BASE*: string
CONFIG_NAME*: string
# Transition
TERMINAL_TOTAL_DIFFICULTY*: UInt256
TERMINAL_BLOCK_HASH*: BlockHash
# TODO TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH*: Epoch
# Genesis
MIN_GENESIS_ACTIVE_VALIDATOR_COUNT*: uint64
MIN_GENESIS_TIME*: uint64
GENESIS_FORK_VERSION*: Version
GENESIS_DELAY*: uint64
# Forking
ALTAIR_FORK_VERSION*: Version
ALTAIR_FORK_EPOCH*: Epoch
BELLATRIX_FORK_VERSION*: Version
BELLATRIX_FORK_EPOCH*: Epoch
CAPELLA_FORK_VERSION*: Version
CAPELLA_FORK_EPOCH*: Epoch
SHARDING_FORK_VERSION*: Version
SHARDING_FORK_EPOCH*: Epoch
# Time parameters
# TODO SECONDS_PER_SLOT*: uint64
SECONDS_PER_ETH1_BLOCK*: uint64
MIN_VALIDATOR_WITHDRAWABILITY_DELAY*: uint64
SHARD_COMMITTEE_PERIOD*: uint64
ETH1_FOLLOW_DISTANCE*: uint64
# Validator cycle
INACTIVITY_SCORE_BIAS*: uint64
INACTIVITY_SCORE_RECOVERY_RATE*: uint64
EJECTION_BALANCE*: uint64
MIN_PER_EPOCH_CHURN_LIMIT*: uint64
CHURN_LIMIT_QUOTIENT*: uint64
# Fork choice
# TODO PROPOSER_SCORE_BOOST*: uint64
# Deposit contract
DEPOSIT_CHAIN_ID*: uint64
DEPOSIT_NETWORK_ID*: uint64
DEPOSIT_CONTRACT_ADDRESS*: Eth1Address
PresetFile* = object
values*: Table[string, string]
missingValues*: seq[string]
PresetFileError* = object of CatchableError
PresetIncompatibleError* = object of CatchableError
const
FAR_FUTURE_EPOCH* = (not 0'u64).Epoch # 2^64 - 1 in spec
const_preset* {.strdefine.} = "mainnet"
# These constants cannot really be overriden in a preset.
# If we encounter them, we'll just ignore the preset value.
# TODO verify the value against the constant instead
ignoredValues* = [
# TODO Once implemented as part of the RuntimeConfig,
# this should be removed from here
"SECONDS_PER_SLOT",
"BLS_WITHDRAWAL_PREFIX",
"MAX_COMMITTEES_PER_SLOT",
"TARGET_COMMITTEE_SIZE",
"MAX_VALIDATORS_PER_COMMITTEE",
"SHUFFLE_ROUND_COUNT",
"HYSTERESIS_QUOTIENT",
"HYSTERESIS_DOWNWARD_MULTIPLIER",
"HYSTERESIS_UPWARD_MULTIPLIER",
"SAFE_SLOTS_TO_UPDATE_JUSTIFIED",
"MIN_DEPOSIT_AMOUNT",
"MAX_EFFECTIVE_BALANCE",
"EFFECTIVE_BALANCE_INCREMENT",
"MIN_ATTESTATION_INCLUSION_DELAY",
"SLOTS_PER_EPOCH",
"MIN_SEED_LOOKAHEAD",
"MAX_SEED_LOOKAHEAD",
"EPOCHS_PER_ETH1_VOTING_PERIOD",
"SLOTS_PER_HISTORICAL_ROOT",
"MIN_EPOCHS_TO_INACTIVITY_PENALTY",
"EPOCHS_PER_HISTORICAL_VECTOR",
"EPOCHS_PER_SLASHINGS_VECTOR",
"HISTORICAL_ROOTS_LIMIT",
"VALIDATOR_REGISTRY_LIMIT",
"BASE_REWARD_FACTOR",
"WHISTLEBLOWER_REWARD_QUOTIENT",
"PROPOSER_REWARD_QUOTIENT",
"INACTIVITY_PENALTY_QUOTIENT",
"MIN_SLASHING_PENALTY_QUOTIENT",
"PROPORTIONAL_SLASHING_MULTIPLIER",
"MAX_PROPOSER_SLASHINGS",
"MAX_ATTESTER_SLASHINGS",
"MAX_ATTESTATIONS",
"MAX_DEPOSITS",
"MAX_VOLUNTARY_EXITS",
"TARGET_AGGREGATORS_PER_COMMITTEE",
"RANDOM_SUBNETS_PER_VALIDATOR",
"EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION",
"ATTESTATION_SUBNET_COUNT",
"DOMAIN_BEACON_PROPOSER",
"DOMAIN_BEACON_ATTESTER",
"DOMAIN_RANDAO",
"DOMAIN_DEPOSIT",
"DOMAIN_VOLUNTARY_EXIT",
"DOMAIN_SELECTION_PROOF",
"DOMAIN_AGGREGATE_AND_PROOF",
"DOMAIN_SYNC_COMMITTEE",
"DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF",
"DOMAIN_CONTRIBUTION_AND_PROOF",
"TRANSITION_TOTAL_DIFFICULTY", # Name that appears in some altair alphas, obsolete, remove when no more testnets
"MIN_ANCHOR_POW_BLOCK_DIFFICULTY", # Name that appears in some altair alphas, obsolete, remove when no more testnets
"TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH", # Never pervasively implemented, still under discussion
"PROPOSER_SCORE_BOOST", # Isn't being used as a preset in the usual way: at any time, there's one correct value
]
when const_preset == "mainnet":
import ./presets/mainnet
export mainnet
# TODO Move this to RuntimeConfig
const SECONDS_PER_SLOT* {.intdefine.}: uint64 = 12
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/configs/mainnet.yaml
# TODO Read these from yaml file
const defaultRuntimeConfig* = RuntimeConfig(
# Mainnet config
# Extends the mainnet preset
PRESET_BASE: "mainnet",
# Free-form short name of the network that this configuration applies to - known
# canonical network names include:
# * 'mainnet' - there can be only one
# * 'prater' - testnet
# * 'ropsten' - testnet
# * 'sepolia' - testnet
# Must match the regex: [a-z0-9\-]
CONFIG_NAME: "mainnet",
# Transition
# ---------------------------------------------------------------
# TBD, 2**256-2**10 is a placeholder
TERMINAL_TOTAL_DIFFICULTY:
u256"115792089237316195423570985008687907853269984665640564039457584007913129638912",
# By default, don't use these params
TERMINAL_BLOCK_HASH: BlockHash.fromHex(
"0x0000000000000000000000000000000000000000000000000000000000000000"),
# TODO TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: Epoch(uint64.high),
# Genesis
# ---------------------------------------------------------------
# `2**14` (= 16,384)
MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 16384,
# Dec 1, 2020, 12pm UTC
MIN_GENESIS_TIME: 1606824000,
# Mainnet initial fork version, recommend altering for testnets
GENESIS_FORK_VERSION: Version [byte 0x00, 0x00, 0x00, 0x00],
# 604800 seconds (7 days)
GENESIS_DELAY: 604800,
# Forking
# ---------------------------------------------------------------
# Some forks are disabled for now:
# - These may be re-assigned to another fork-version later
# - Temporarily set to max uint64 value: 2**64 - 1
# Altair
ALTAIR_FORK_VERSION: Version [byte 0x01, 0x00, 0x00, 0x00],
ALTAIR_FORK_EPOCH: Epoch(74240), # Oct 27, 2021, 10:56:23am UTC
# Bellatrix
BELLATRIX_FORK_VERSION: Version [byte 0x02, 0x00, 0x00, 0x00],
BELLATRIX_FORK_EPOCH: Epoch(uint64.high),
# Capella
CAPELLA_FORK_VERSION: Version [byte 0x03, 0x00, 0x00, 0x00],
CAPELLA_FORK_EPOCH: Epoch(uint64.high),
# Sharding
SHARDING_FORK_VERSION: Version [byte 0x04, 0x00, 0x00, 0x00],
SHARDING_FORK_EPOCH: Epoch(uint64.high),
# Time parameters
# ---------------------------------------------------------------
# 12 seconds
# TODO SECONDS_PER_SLOT: 12,
# 14 (estimate from Eth1 mainnet)
SECONDS_PER_ETH1_BLOCK: 14,
# 2**8 (= 256) epochs ~27 hours
MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256,
# 2**8 (= 256) epochs ~27 hours
SHARD_COMMITTEE_PERIOD: 256,
# 2**11 (= 2,048) Eth1 blocks ~8 hours
ETH1_FOLLOW_DISTANCE: 2048,
# Validator cycle
# ---------------------------------------------------------------
# 2**2 (= 4)
INACTIVITY_SCORE_BIAS: 4,
# 2**4 (= 16)
INACTIVITY_SCORE_RECOVERY_RATE: 16,
# 2**4 * 10**9 (= 16,000,000,000) Gwei
EJECTION_BALANCE: 16000000000'u64,
# 2**2 (= 4)
MIN_PER_EPOCH_CHURN_LIMIT: 4,
# 2**16 (= 65,536)
CHURN_LIMIT_QUOTIENT: 65536,
# Deposit contract
# ---------------------------------------------------------------
# Ethereum PoW Mainnet
DEPOSIT_CHAIN_ID: 1,
DEPOSIT_NETWORK_ID: 1,
DEPOSIT_CONTRACT_ADDRESS: Eth1Address.fromHex("0x00000000219ab540356cBB839Cbe05303d7705Fa")
)
elif const_preset == "minimal":
import ./presets/minimal
export minimal
const SECONDS_PER_SLOT* {.intdefine.}: uint64 = 6
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/configs/minimal.yaml
const defaultRuntimeConfig* = RuntimeConfig(
# Minimal config
# Extends the minimal preset
PRESET_BASE: "minimal",
# Free-form short name of the network that this configuration applies to - known
# canonical network names include:
# * 'mainnet' - there can be only one
# * 'prater' - testnet
# * 'ropsten' - testnet
# * 'sepolia' - testnet
# Must match the regex: [a-z0-9\-]
CONFIG_NAME: "minimal",
# Transition
# ---------------------------------------------------------------
# TBD, 2**256-2**10 is a placeholder
TERMINAL_TOTAL_DIFFICULTY:
u256"115792089237316195423570985008687907853269984665640564039457584007913129638912",
# By default, don't use these params
TERMINAL_BLOCK_HASH: BlockHash.fromHex(
"0x0000000000000000000000000000000000000000000000000000000000000000"),
# TODO TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: Epoch(uint64.high),
# Genesis
# ---------------------------------------------------------------
# [customized]
MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 64,
# Jan 3, 2020
MIN_GENESIS_TIME: 1578009600,
# Highest byte set to 0x01 to avoid collisions with mainnet versioning
GENESIS_FORK_VERSION: Version [byte 0x00, 0x00, 0x00, 0x01],
# [customized] Faster to spin up testnets, but does not give validator reasonable warning time for genesis
GENESIS_DELAY: 300,
# Forking
# ---------------------------------------------------------------
# Values provided for illustrative purposes.
# Individual tests/testnets may set different values.
# Altair
ALTAIR_FORK_VERSION: Version [byte 0x01, 0x00, 0x00, 0x01],
ALTAIR_FORK_EPOCH: Epoch(uint64.high),
# Bellatrix
BELLATRIX_FORK_VERSION: Version [byte 0x02, 0x00, 0x00, 0x01],
BELLATRIX_FORK_EPOCH: Epoch(uint64.high),
# Capella
CAPELLA_FORK_VERSION: Version [byte 0x03, 0x00, 0x00, 0x01],
CAPELLA_FORK_EPOCH: Epoch(uint64.high),
# Sharding
SHARDING_FORK_VERSION: Version [byte 0x04, 0x00, 0x00, 0x01],
SHARDING_FORK_EPOCH: Epoch(uint64.high),
# Time parameters
# ---------------------------------------------------------------
# [customized] Faster for testing purposes
# TODO SECONDS_PER_SLOT: 6,
# 14 (estimate from Eth1 mainnet)
SECONDS_PER_ETH1_BLOCK: 14,
# 2**8 (= 256) epochs
MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256,
# [customized] higher frequency of committee turnover and faster time to acceptable voluntary exit
SHARD_COMMITTEE_PERIOD: 64,
# [customized] process deposits more quickly, but insecure
ETH1_FOLLOW_DISTANCE: 16,
# Validator cycle
# ---------------------------------------------------------------
# 2**2 (= 4)
INACTIVITY_SCORE_BIAS: 4,
# 2**4 (= 16)
INACTIVITY_SCORE_RECOVERY_RATE: 16,
# 2**4 * 10**9 (= 16,000,000,000) Gwei
EJECTION_BALANCE: 16000000000'u64,
# 2**2 (= 4)
MIN_PER_EPOCH_CHURN_LIMIT: 4,
# [customized] scale queue churn at much lower validator counts for testing
CHURN_LIMIT_QUOTIENT: 32,
# Deposit contract
# ---------------------------------------------------------------
# Ethereum Goerli testnet
DEPOSIT_CHAIN_ID: 5,
DEPOSIT_NETWORK_ID: 5,
# Configured on a per testnet basis
DEPOSIT_CONTRACT_ADDRESS: Eth1Address.fromHex("0x1234567890123456789012345678901234567890")
)
else:
{.error: "Only mainnet and minimal presets supported".}
# macro createConstantsFromPreset*(path: static string): untyped =
# result = newStmtList()
# let preset = try: readPresetFile(path)
# except CatchableError as err:
# error err.msg # TODO: This should be marked as noreturn
# return
# for name, value in preset.values:
# let
# typ = getType(name)
# value = if typ in ["int64", "uint64", "byte"]: typ & "(" & value & ")"
# else: "parse(" & typ & ", \"" & value & "\")"
# try:
# result.add parseStmt("const $1* {.intdefine.} = $2" % [$name, value])
# except ValueError:
# doAssert false, "All values in the presets are printable"
# if preset.missingValues.card > 0:
# warning "Missing constants in preset: " & $preset.missingValues
# createConstantsFromPreset const_preset
const SLOTS_PER_SYNC_COMMITTEE_PERIOD* =
SLOTS_PER_EPOCH * EPOCHS_PER_SYNC_COMMITTEE_PERIOD
func parse(T: type uint64, input: string): T {.raises: [ValueError, Defect].} =
var res: BiggestUInt
if input.len > 2 and input[0] == '0' and input[1] == 'x':
if parseHex(input, res) != input.len:
raise newException(ValueError, "The constant value should be a valid hex integer")
else:
if parseBiggestUInt(input, res) != input.len:
raise newException(ValueError, "The constant value should be a valid unsigned integer")
uint64(res)
template parse(T: type byte, input: string): T =
byte parse(uint64, input)
func parse(T: type Version, input: string): T
{.raises: [ValueError, Defect].} =
Version hexToByteArray(input, 4)
template parse(T: type Slot, input: string): T =
Slot parse(uint64, input)
template parse(T: type Epoch, input: string): T =
Epoch parse(uint64, input)
template parse(T: type string, input: string): T =
input.strip(chars = {'"', '\''})
template parse(T: type Eth1Address, input: string): T =
Eth1Address.fromHex(input)
template parse(T: type BlockHash, input: string): T =
BlockHash.fromHex(input)
template parse(T: type UInt256, input: string): T =
parse(input, UInt256, 10)
proc readRuntimeConfig*(
path: string): (RuntimeConfig, seq[string]) {.
raises: [IOError, PresetFileError, PresetIncompatibleError, Defect].} =
var
lineNum = 0
cfg = defaultRuntimeConfig
unknowns: seq[string]
template lineinfo: string =
try: "$1($2) " % [path, $lineNum]
except ValueError: path
template fail(msg) =
raise newException(PresetFileError, lineinfo() & msg)
var names: seq[string]
for name, field in cfg.fieldPairs():
names.add name
var values: Table[string, string]
for line in splitLines(readFile(path)):
inc lineNum
if line.len == 0 or line[0] == '#': continue
# remove any trailing comments
let line = line.split("#")[0]
let lineParts = line.split(":")
if lineParts.len != 2:
fail "Invalid syntax: A preset file should include only assignments in the form 'ConstName: Value'"
if lineParts[0] in ignoredValues: continue
if lineParts[0] notin names:
unknowns.add(lineParts[0])
values[lineParts[0]] = lineParts[1].strip
for name, field in cfg.fieldPairs():
if name in values:
try:
field = parse(typeof(field), values[name])
except ValueError:
raise (ref PresetFileError)(msg: "Unable to parse " & name)
if cfg.PRESET_BASE != const_preset:
raise (ref PresetIncompatibleError)(
msg: "Config not compatible with binary, compile with -d:const_preset=" & cfg.PRESET_BASE)
(cfg, unknowns)
template name*(cfg: RuntimeConfig): string =
if cfg.CONFIG_NAME.len() > 0:
cfg.CONFIG_NAME
else:
const_preset
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/p2p-interface.md#configuration
func MIN_EPOCHS_FOR_BLOCK_REQUESTS*(cfg: RuntimeConfig): uint64 =
cfg.MIN_VALIDATOR_WITHDRAWABILITY_DELAY + cfg.CHURN_LIMIT_QUOTIENT div 2
func defaultLightClientDataMaxPeriods*(cfg: RuntimeConfig): uint64 =
const epochsPerPeriod = EPOCHS_PER_SYNC_COMMITTEE_PERIOD
let maxEpochs = cfg.MIN_EPOCHS_FOR_BLOCK_REQUESTS
(maxEpochs + epochsPerPeriod - 1) div epochsPerPeriod
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