nimbus-eth2/beacon_chain/network_metadata.nim

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import
tables, strutils, os, options,
stew/shims/macros, nimcrypto/hash,
web3/[ethtypes, conversions],
spec/presets
# 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:
# We can compress the embedded states with snappy before embedding them here.
{.push raises: [Defect].}
export
ethtypes, conversions, RuntimePreset
type
Eth1Address* = ethtypes.Address
Eth1BlockHash* = ethtypes.BlockHash
Eth1Network* = enum
mainnet
rinkeby
goerli
PresetIncompatible* = object of CatchableError
Eth2NetworkMetadata* = object
case incompatible*: bool
of false:
eth1Network*: Option[Eth1Network]
runtimePreset*: RuntimePreset
# Parsing `enr.Records` is still not possible at compile-time
bootstrapNodes*: seq[string]
depositContractAddress*: Eth1Address
depositContractDeployedAt*: Eth1BlockHash
# 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
else:
incompatibilityDesc*: string
const presetValueLoaders = genExpr(nnkBracket):
for constName in PresetValue:
let
constNameIdent = ident $constName
constType = ident getType(constName)
yield quote do:
(
proc (preset: var RuntimePreset, presetValue: string): bool
{.gcsafe, noSideEffect, raises: [Defect].} =
try:
when PresetValue.`constNameIdent` in runtimeValues:
preset.`constNameIdent` = parse(`constType`, presetValue)
true
elif PresetValue.`constNameIdent` in ignoredValues:
true
else:
`constType`(`constNameIdent`) == parse(`constType`, presetValue)
except CatchableError as err:
false
)
proc extractRuntimePreset*(configPath: string, configData: PresetFile): RuntimePreset
{.raises: [PresetIncompatible, Defect].} =
result = RuntimePreset()
for name, value in configData.values:
if name notin runtimeValues:
if not presetValueLoaders[name.int](result, value):
let errMsg = "The preset '" & configPath & "'is not compatible with " &
"the current build due to an incompatible value " &
$name & " = " & value.string
raise newException(PresetIncompatible, errMsg)
proc loadEth2NetworkMetadata*(path: string): Eth2NetworkMetadata
{.raises: [CatchableError, Defect].} =
try:
let
genesisPath = path / "genesis.ssz"
configPath = path / "config.yaml"
depositContractPath = path / "deposit_contract.txt"
depositContractBlockPath = path / "deposit_contract_block.txt"
runtimePreset = if fileExists(configPath):
extractRuntimePreset(configPath, readPresetFile(configPath))
else:
mainnetRuntimePreset
depositContractAddress = if fileExists(depositContractPath):
Eth1Address.fromHex readFile(depositContractPath).strip
else:
default(Eth1Address)
depositContractBlock = if fileExists(depositContractBlockPath):
Eth1BlockHash.fromHex readFile(depositContractBlockPath).strip
else:
default(Eth1BlockHash)
genesisData = if fileExists(genesisPath): readFile(genesisPath)
else: ""
Eth2NetworkMetadata(
incompatible: false,
eth1Network: some goerli,
runtimePreset: runtimePreset,
bootstrapNodes: readFile(path / "bootstrap_nodes.txt").split("\n"),
depositContractAddress: depositContractAddress,
depositContractDeployedAt: depositContractBlock,
genesisData: genesisData)
except PresetIncompatible as err:
Eth2NetworkMetadata(incompatible: true,
incompatibilityDesc: err.msg)
const
mainnetMetadata* = when const_preset == "mainnet":
Eth2NetworkMetadata(
incompatible: false, # TODO: This can be more accurate if we verify
# that there are no constant overrides
eth1Network: some mainnet,
runtimePreset: mainnetRuntimePreset,
# TODO The values below are just placeholders for now
bootstrapNodes: @[],
depositContractAddress: Eth1Address.fromHex "0x1234567890123456789012345678901234567890",
depositContractDeployedAt: Eth1BlockHash.fromHex "0x73056f16a59bf70abad5b4365438e8a7d646aa0d7f56d22c3d9e4c6000d8e176",
genesisData: "")
else:
Eth2NetworkMetadata(
incompatible: true,
incompatibilityDesc: "This build is compiled with the " & const_preset & " const preset. " &
"It's not compatible with mainnet")
const
altonaMetadata* = loadEth2NetworkMetadata(
currentSourcePath.parentDir / ".." / "vendor" / "eth2-testnets" / "shared" / "altona")
testnet0Metadata* = loadEth2NetworkMetadata(
currentSourcePath.parentDir / ".." / "vendor" / "eth2-testnets" / "nimbus" / "testnet0")
testnet1Metadata* = loadEth2NetworkMetadata(
currentSourcePath.parentDir / ".." / "vendor" / "eth2-testnets" / "nimbus" / "testnet1")