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nimbus-eth2/beacon_chain/networking/network_metadata.nim

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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.
when (NimMajor, NimMinor) < (1, 4):
{.push raises: [Defect].}
else:
{.push raises: [].}
import
std/[sequtils, strutils, os],
stew/[byteutils, objects], stew/shims/macros, nimcrypto/hash,
web3/[ethtypes, conversions],
chronicles,
eth/common/eth_types_json_serialization,
../spec/eth2_ssz_serialization,
../spec/datatypes/phase0
# ATTENTION! This file will produce a large C file, because we are inlining
# genesis states as C literals in the generated code (and blobs in the final
# binary). It makes sense to keep the file small and separated from the rest
# of the module in order go gain maximum efficiency in incremental compilation.
#
# TODO(zah):
# We can compress the embedded states with snappy before embedding them here.
export
ethtypes, conversions, RuntimeConfig
type
Eth1BlockHash* = ethtypes.BlockHash
Eth1Network* = enum
mainnet
ropsten
rinkeby
goerli
sepolia
Eth2NetworkMetadata* = object
case incompatible*: bool
of false:
# TODO work-around a Nim codegen issue where upon constant assignment
# the compiler will copy `incompatibilityDesc` even when the case
# branch is not active and thus it will override the first variable
# in this branch.
dummy: string
# If the eth1Network is specified, the Eth1Monitor will perform some
# additional checks to ensure we are connecting to a web3 provider
# serving data for the same network. The value can be set to `None`
# for custom networks and testing purposes.
eth1Network*: Option[Eth1Network]
cfg*: RuntimeConfig
# Parsing `enr.Records` is still not possible at compile-time
bootstrapNodes*: seq[string]
depositContractBlock*: uint64
depositContractBlockHash*: Eth2Digest
# Please note that we are using `string` here because SSZ.decode
# is not currently usable at compile time and we want to load the
# network metadata into a constant.
#
# We could have also used `seq[byte]`, but this results in a lot
# more generated code that slows down compilation. The impact on
# compilation times of embedding the genesis as a string is roughly
# 0.1s on my machine (you can test this by choosing an invalid name
# for the genesis file below).
#
# `genesisData` will have `len == 0` for networks with a still
# unknown genesis state.
genesisData*: string
genesisDepositsSnapshot*: string
else:
incompatibilityDesc*: string
const
eth2NetworksDir = currentSourcePath.parentDir.replace('\\', '/') & "/../../vendor/eth2-networks"
mergeTestnetsDir = currentSourcePath.parentDir.replace('\\', '/') & "/../../vendor/merge-testnets"
proc readBootstrapNodes*(path: string): seq[string] {.raises: [IOError, Defect].} =
# Read a list of ENR values from a YAML file containing a flat list of entries
if fileExists(path):
splitLines(readFile(path)).
filterIt(it.startsWith("enr:")).
mapIt(it.strip())
else:
@[]
proc readBootEnr*(path: string): seq[string] {.raises: [IOError, Defect].} =
# Read a list of ENR values from a YAML file containing a flat list of entries
if fileExists(path):
splitLines(readFile(path)).
filterIt(it.startsWith("- enr:")).
mapIt(it[2..^1].strip())
else:
@[]
proc loadEth2NetworkMetadata*(path: string, eth1Network = none(Eth1Network)): Eth2NetworkMetadata
{.raises: [CatchableError, Defect].} =
# Load data in eth2-networks format
# https://github.com/eth-clients/eth2-networks
try:
let
genesisPath = path & "/genesis.ssz"
genesisDepositsSnapshotPath = path & "/genesis_deposit_contract_snapshot.ssz"
configPath = path & "/config.yaml"
deployBlockPath = path & "/deploy_block.txt"
depositContractBlockPath = path & "/deposit_contract_block.txt"
depositContractBlockHashPath = path & "/deposit_contract_block_hash.txt"
bootstrapNodesPath = path & "/bootstrap_nodes.txt"
bootEnrPath = path & "/boot_enr.yaml"
runtimeConfig = if fileExists(configPath):
let (cfg, unknowns) = readRuntimeConfig(configPath)
if unknowns.len > 0:
when nimvm:
# TODO better printing
echo "Unknown constants in file: " & unknowns
else:
warn "Unknown constants in config file", unknowns
cfg
else:
defaultRuntimeConfig
depositContractBlockStr = if fileExists(depositContractBlockPath):
readFile(depositContractBlockPath).strip
else:
""
depositContractBlockHashStr = if fileExists(depositContractBlockHashPath):
readFile(depositContractBlockHashPath).strip
else:
""
deployBlockStr = if fileExists(deployBlockPath):
readFile(deployBlockPath).strip
else:
""
depositContractBlock = if depositContractBlockStr.len > 0:
parseBiggestUInt depositContractBlockStr
elif deployBlockStr.len > 0:
parseBiggestUInt deployBlockStr
elif not runtimeConfig.DEPOSIT_CONTRACT_ADDRESS.isDefaultValue:
raise newException(ValueError,
"A network with deposit contract should specify the " &
"deposit contract deployment block in a file named " &
"deposit_contract_block.txt or deploy_block.txt")
else:
1'u64
depositContractBlockHash = if depositContractBlockHashStr.len > 0:
Eth2Digest.strictParse(depositContractBlockHashStr)
elif not runtimeConfig.DEPOSIT_CONTRACT_ADDRESS.isDefaultValue:
raise newException(ValueError,
"A network with deposit contract should specify the " &
"deposit contract deployment block hash in a file " &
"name deposit_contract_block_hash.txt")
else:
default(Eth2Digest)
bootstrapNodes = deduplicate(
readBootstrapNodes(bootstrapNodesPath) &
readBootEnr(bootEnrPath))
genesisData = if fileExists(genesisPath):
readFile(genesisPath)
else:
""
genesisDepositsSnapshot = if fileExists(genesisDepositsSnapshotPath):
readFile(genesisDepositsSnapshotPath)
else:
""
Eth2NetworkMetadata(
incompatible: false,
eth1Network: eth1Network,
cfg: runtimeConfig,
bootstrapNodes: bootstrapNodes,
depositContractBlock: depositContractBlock,
depositContractBlockHash: depositContractBlockHash,
genesisData: genesisData,
genesisDepositsSnapshot: genesisDepositsSnapshot)
except PresetIncompatibleError as err:
Eth2NetworkMetadata(incompatible: true,
incompatibilityDesc: err.msg)
proc loadCompileTimeNetworkMetadata(
path: string,
eth1Network = none(Eth1Network)): Eth2NetworkMetadata {.raises: [Defect].} =
try:
result = loadEth2NetworkMetadata(path, eth1Network)
if result.incompatible:
macros.error "The current build is misconfigured. " &
"Attempt to load an incompatible network metadata: " &
result.incompatibilityDesc
except CatchableError as err:
macros.error "Failed to load network metadata at '" & path & "': " & err.msg
template eth2Network(path: string, eth1Network: Eth1Network): Eth2NetworkMetadata =
loadCompileTimeNetworkMetadata(eth2NetworksDir & "/" & path,
some eth1Network)
template mergeTestnet(path: string, eth1Network: Eth1Network): Eth2NetworkMetadata =
loadCompileTimeNetworkMetadata(mergeTestnetsDir & "/" & path,
some eth1Network)
when const_preset == "gnosis":
const
gnosisMetadata* = loadCompileTimeNetworkMetadata(
currentSourcePath.parentDir.replace('\\', '/') &
"/../../vendor/gnosis-chain-configs/mainnet")
static:
checkForkConsistency(gnosisMetadata.cfg)
doAssert gnosisMetadata.cfg.CAPELLA_FORK_EPOCH == FAR_FUTURE_EPOCH
doAssert gnosisMetadata.cfg.EIP4844_FORK_EPOCH == FAR_FUTURE_EPOCH
elif const_preset == "mainnet":
const
mainnetMetadata* = eth2Network("shared/mainnet", mainnet)
praterMetadata* = eth2Network("shared/prater", goerli)
sepoliaMetadata* = mergeTestnet("sepolia", sepolia)
static:
for network in [
mainnetMetadata, praterMetadata, sepoliaMetadata]:
checkForkConsistency(network.cfg)
doAssert network.cfg.CAPELLA_FORK_EPOCH == FAR_FUTURE_EPOCH
doAssert network.cfg.EIP4844_FORK_EPOCH == FAR_FUTURE_EPOCH
proc getMetadataForNetwork*(
networkName: string): Eth2NetworkMetadata {.raises: [Defect, IOError].} =
template loadRuntimeMetadata(): auto =
if fileExists(networkName / "config.yaml"):
try:
loadEth2NetworkMetadata(networkName)
except CatchableError as exc:
fatal "Cannot load network", msg = exc.msg, networkName
quit 1
else:
fatal "config.yaml not found for network", networkName
quit 1
if networkName == "ropsten":
warn "Ropsten is unsupported; https://blog.ethereum.org/2022/11/30/ropsten-shutdown-announcement suggests migrating to Goerli or Sepolia"
let metadata =
when const_preset == "gnosis":
case toLowerAscii(networkName)
of "gnosis":
gnosisMetadata
of "gnosis-chain":
warn "`--network:gnosis-chain` is deprecated, " &
"use `--network:gnosis` instead"
gnosisMetadata
else:
loadRuntimeMetadata()
elif const_preset == "mainnet":
case toLowerAscii(networkName)
of "mainnet":
mainnetMetadata
of "prater", "goerli":
praterMetadata
of "sepolia":
sepoliaMetadata
else:
loadRuntimeMetadata()
else:
loadRuntimeMetadata()
if metadata.incompatible:
fatal "The selected network is not compatible with the current build",
reason = metadata.incompatibilityDesc
quit 1
metadata
proc getRuntimeConfig*(
eth2Network: Option[string]): RuntimeConfig {.raises: [Defect, IOError].} =
## Returns the run-time config for a network specified on the command line
## If the network is not explicitly specified, the function will act as the
## regular Nimbus binary, returning the mainnet config.
##
## TODO the assumption that the input variable is a CLI config option is not
## quite appropriate in such as low-level function. The "assume mainnet by
## default" behavior is something that should be handled closer to the `conf`
## layer.
if eth2Network.isSome:
return getMetadataForNetwork(eth2Network.get).cfg
when const_preset == "mainnet":
mainnetMetadata.cfg
elif const_preset == "gnosis":
gnosisMetadata.cfg
else:
# This is a non-standard build (i.e. minimal), and the function was most
# likely executed in a test. The best we can do is return a fully default
# config:
defaultRuntimeConfig
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