237 lines
8.5 KiB
Nim
237 lines
8.5 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2022 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [Defect].}
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import
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std/[sequtils, strutils, os],
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stew/shims/macros, nimcrypto/hash,
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eth/common/eth_types as commonEthTypes,
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web3/[ethtypes, conversions],
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chronicles,
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eth/common/eth_types_json_serialization,
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ssz_serialization/navigator,
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../spec/eth2_ssz_serialization,
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../spec/datatypes/phase0
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# ATTENTION! This file will produce a large C file, because we are inlining
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# genesis states as C literals in the generated code (and blobs in the final
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# binary). It makes sense to keep the file small and separated from the rest
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# of the module in order go gain maximum efficiency in incremental compilation.
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#
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# TODO(zah):
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# We can compress the embedded states with snappy before embedding them here.
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export
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ethtypes, conversions, RuntimeConfig
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type
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Eth1BlockHash* = ethtypes.BlockHash
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Eth1Network* = enum
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mainnet
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rinkeby
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goerli
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Eth2NetworkMetadata* = object
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case incompatible*: bool
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of false:
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# TODO work-around a Nim codegen issue where upon constant assignment
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# the compiler will copy `incompatibilityDesc` even when the case
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# branch is not active and thus it will override the first variable
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# in this branch.
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dummy: string
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# If the eth1Network is specified, the Eth1Monitor will perform some
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# additional checks to ensure we are connecting to a web3 provider
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# serving data for the same network. The value can be set to `None`
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# for custom networks and testing purposes.
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eth1Network*: Option[Eth1Network]
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cfg*: RuntimeConfig
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# Parsing `enr.Records` is still not possible at compile-time
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bootstrapNodes*: seq[string]
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depositContractDeployedAt*: BlockHashOrNumber
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# Please note that we are using `string` here because SSZ.decode
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# is not currently usable at compile time and we want to load the
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# network metadata into a constant.
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#
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# We could have also used `seq[byte]`, but this results in a lot
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# more generated code that slows down compilation. The impact on
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# compilation times of embedding the genesis as a string is roughly
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# 0.1s on my machine (you can test this by choosing an invalid name
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# for the genesis file below).
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#
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# `genesisData` will have `len == 0` for networks with a still
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# unknown genesis state.
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genesisData*: string
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genesisDepositsSnapshot*: string
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else:
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incompatibilityDesc*: string
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const
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eth2NetworksDir = currentSourcePath.parentDir.replace('\\', '/') & "/../../vendor/eth2-networks"
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proc readBootstrapNodes*(path: string): seq[string] {.raises: [IOError, Defect].} =
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# Read a list of ENR values from a YAML file containing a flat list of entries
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if fileExists(path):
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splitLines(readFile(path)).
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filterIt(it.startsWith("enr:")).
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mapIt(it.strip())
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else:
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@[]
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proc readBootEnr*(path: string): seq[string] {.raises: [IOError, Defect].} =
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# Read a list of ENR values from a YAML file containing a flat list of entries
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if fileExists(path):
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splitLines(readFile(path)).
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filterIt(it.startsWith("- enr:")).
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mapIt(it[2..^1].strip())
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else:
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@[]
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proc loadEth2NetworkMetadata*(path: string, eth1Network = none(Eth1Network)): Eth2NetworkMetadata
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{.raises: [CatchableError, Defect].} =
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# Load data in eth2-networks format
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# https://github.com/eth2-clients/eth2-networks/
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try:
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let
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genesisPath = path & "/genesis.ssz"
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genesisDepositsSnapshotPath = path & "/genesis_deposit_contract_snapshot.ssz"
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configPath = path & "/config.yaml"
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depositContractBlockPath = path & "/deposit_contract_block.txt"
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bootstrapNodesPath = path & "/bootstrap_nodes.txt"
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bootEnrPath = path & "/boot_enr.yaml"
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runtimeConfig = if fileExists(configPath):
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let (cfg, unknowns) = readRuntimeConfig(configPath)
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if unknowns.len > 0:
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when nimvm:
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# TODO better printing
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echo "Unknown constants in file: " & unknowns
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else:
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warn "Unknown constants in config file", unknowns
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cfg
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else:
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defaultRuntimeConfig
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depositContractBlock = if fileExists(depositContractBlockPath):
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readFile(depositContractBlockPath).strip
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else:
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""
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depositContractDeployedAt = if depositContractBlock.len > 0:
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BlockHashOrNumber.init(depositContractBlock)
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else:
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BlockHashOrNumber(isHash: false, number: 1)
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bootstrapNodes = deduplicate(
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readBootstrapNodes(bootstrapNodesPath) &
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readBootEnr(bootEnrPath))
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genesisData = if fileExists(genesisPath):
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readFile(genesisPath)
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else:
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""
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genesisDepositsSnapshot = if fileExists(genesisDepositsSnapshotPath):
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readFile(genesisDepositsSnapshotPath)
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else:
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""
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Eth2NetworkMetadata(
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incompatible: false,
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eth1Network: eth1Network,
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cfg: runtimeConfig,
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bootstrapNodes: bootstrapNodes,
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depositContractDeployedAt: depositContractDeployedAt,
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genesisData: genesisData,
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genesisDepositsSnapshot: genesisDepositsSnapshot)
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except PresetIncompatibleError as err:
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Eth2NetworkMetadata(incompatible: true,
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incompatibilityDesc: err.msg)
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proc loadCompileTimeNetworkMetadata(
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path: string,
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eth1Network = none(Eth1Network)): Eth2NetworkMetadata {.raises: [Defect].} =
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try:
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result = loadEth2NetworkMetadata(path, eth1Network)
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if result.incompatible:
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macros.error "The current build is miscondigured. " &
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"Attempt to load an incompatible network metadata: " &
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result.incompatibilityDesc
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except CatchableError as err:
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macros.error "Failed to load network metadata at '" & path & "': " & err.msg
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template eth2Network(path: string, eth1Network: Eth1Network): Eth2NetworkMetadata =
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loadCompileTimeNetworkMetadata(eth2NetworksDir & "/" & path,
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some eth1Network)
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when not defined(gnosisChainBinary):
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when const_preset == "mainnet":
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const
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mainnetMetadata* = eth2Network("shared/mainnet", mainnet)
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pyrmontMetadata* = eth2Network("shared/pyrmont", goerli)
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praterMetadata* = eth2Network("shared/prater", goerli)
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proc getMetadataForNetwork*(networkName: string): Eth2NetworkMetadata {.raises: [Defect, IOError].} =
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template loadRuntimeMetadata: auto =
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if fileExists(networkName / "config.yaml"):
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try:
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loadEth2NetworkMetadata(networkName)
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except CatchableError as exc:
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fatal "Cannot load network", msg = exc.msg, networkName
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quit 1
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else:
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fatal "config.yaml not found for network", networkName
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quit 1
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var
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metadata = when const_preset == "mainnet":
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case toLowerAscii(networkName)
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of "mainnet":
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mainnetMetadata
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of "pyrmont":
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pyrmontMetadata
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of "prater":
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praterMetadata
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else:
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loadRuntimeMetadata()
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else:
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loadRuntimeMetadata()
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if metadata.incompatible:
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fatal "The selected network is not compatible with the current build",
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reason = metadata.incompatibilityDesc
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quit 1
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metadata
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proc getRuntimeConfig*(
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eth2Network: Option[string]): RuntimeConfig {.raises: [Defect, IOError].} =
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if eth2Network.isSome:
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return getMetadataForNetwork(eth2Network.get).cfg
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defaultRuntimeConfig
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else:
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const
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gnosisChainMetadata* = loadCompileTimeNetworkMetadata(
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currentSourcePath.parentDir.replace('\\', '/') & "/../../media/gnosis-chain")
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proc checkNetworkParameterUse*(eth2Network: Option[string]) =
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if eth2Network.isSome and eth2Network.get != "gnosis-chain":
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fatal "The only supported value for the --network parameter is 'gnosis-chain'"
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quit 1
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proc getRuntimeConfig*(eth2Network: Option[string]): RuntimeConfig {.raises: [Defect, IOError].} =
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checkNetworkParameterUse eth2Network
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gnosisChainMetadata.cfg
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proc extractGenesisValidatorRootFromSnapshot*(
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snapshot: string): Eth2Digest {.raises: [Defect, IOError, SszError].} =
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sszMount(snapshot, phase0.BeaconState).genesis_validators_root[]
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