nimbus-eth1/fluffy/network/beacon/beacon_content.nim

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# Fluffy - Portal Network
# Copyright (c) 2022-2023 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: [].}
import
std/typetraits,
stew/[arrayops, results],
beacon_chain/spec/forks,
beacon_chain/spec/datatypes/altair,
nimcrypto/[sha2, hash],
ssz_serialization,
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ssz_serialization/codec,
../../common/common_types
export ssz_serialization, common_types, hash
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# https://github.com/ethereum/consensus-specs/blob/v1.2.0/specs/altair/light-client/p2p-interface.md#configuration
const
MAX_REQUEST_LIGHT_CLIENT_UPDATES* = 128
# Needed to properly encode List[List[byte, XXX], MAX_REQUEST_LIGHT_CLIENT_UPDATES]
# based on eth2 MAX_CHUNK_SIZE, light client update should not be bigger than
# that
MAX_LIGHT_CLIENT_UPDATE_SIZE* = 1 * 1024 * 1024
type
ContentType* = enum
# Note: See same note as for state_content.nim
unused = 0x00
lightClientBootstrap = 0x10
lightClientUpdate = 0x11
lightClientFinalityUpdate = 0x12
lightClientOptimisticUpdate = 0x13
# TODO: Consider how we will gossip bootstraps?
# In consensus light client operation a node trusts only one bootstrap hash,
# therefore offers of other bootstraps would be rejected.
LightClientBootstrapKey* = object
blockHash*: Digest
LightClientUpdateKey* = object
startPeriod*: uint64
count*: uint64
# TODO:
# `optimisticSlot` and `finalizedSlot` are currently not in the spec. They are
# added to avoid accepting them in an offer based on the slot values. However,
# this causes them also to be included in a request, which makes perhaps less
# sense?
LightClientFinalityUpdateKey* = object
finalizedSlot*: uint64 ## slot of finalized header of the update
# TODO: Same remark as for `LightClientFinalityUpdateKey`
LightClientOptimisticUpdateKey* = object
optimisticSlot*: uint64 ## signature_slot of the update
ContentKey* = object
case contentType*: ContentType
of unused:
discard
of lightClientBootstrap:
lightClientBootstrapKey*: LightClientBootstrapKey
of lightClientUpdate:
lightClientUpdateKey*: LightClientUpdateKey
of lightClientFinalityUpdate:
lightClientFinalityUpdateKey*: LightClientFinalityUpdateKey
of lightClientOptimisticUpdate:
lightClientOptimisticUpdateKey*: LightClientOptimisticUpdateKey
# TODO:
# ForkedLightClientUpdateBytesList can get pretty big and is send in one go.
# We will need some chunking here but that is currently only possible in
# Portal wire protocol (and only for offer/accept).
ForkedLightClientUpdateBytes* = List[byte, MAX_LIGHT_CLIENT_UPDATE_SIZE]
ForkedLightClientUpdateBytesList* =
List[ForkedLightClientUpdateBytes, MAX_REQUEST_LIGHT_CLIENT_UPDATES]
# Note: Type not send over the wire, just used internally.
ForkedLightClientUpdateList* =
List[ForkedLightClientUpdate, MAX_REQUEST_LIGHT_CLIENT_UPDATES]
func forkDigestAtEpoch*(
forkDigests: ForkDigests, epoch: Epoch, cfg: RuntimeConfig): ForkDigest =
forkDigests.atEpoch(epoch, cfg)
func encode*(contentKey: ContentKey): ByteList =
doAssert(contentKey.contentType != unused)
ByteList.init(SSZ.encode(contentKey))
proc readSszBytes*(
data: openArray[byte], val: var ContentKey) {.raises: [SszError].} =
mixin readSszValue
if data.len() > 0 and data[0] == ord(unused):
raise newException(MalformedSszError, "SSZ selector unused value")
readSszValue(data, val)
func decode*(contentKey: ByteList): Opt[ContentKey] =
try:
Opt.some(SSZ.decode(contentKey.asSeq(), ContentKey))
except SerializationError:
return Opt.none(ContentKey)
func toContentId*(contentKey: ByteList): ContentId =
# TODO: Should we try to parse the content key here for invalid ones?
let idHash = sha2.sha256.digest(contentKey.asSeq())
readUintBE[256](idHash.data)
func toContentId*(contentKey: ContentKey): ContentId =
toContentId(encode(contentKey))
# Yes, this API is odd as you pass a SomeForkedLightClientObject yet still have
# to also pass the ForkDigest. This is because we can't just select the right
# digest through the LightClientDataFork here as LightClientDataFork and
# ConsensusFork are not mapped 1-to-1. There is loss of fork data.
# This means we need to get the ConsensusFork directly, which is possible by
# passing the epoch (slot) from the object through `forkDigestAtEpoch`. This
# however requires the runtime config which is part of the `Eth2Node` object.
# Not something we would like to include as a parameter here, so we stick with
# just passing the forkDigest and doing the work outside of this encode call.
func encodeForkedLightClientObject*(
obj: SomeForkedLightClientObject,
forkDigest: ForkDigest): seq[byte] =
withForkyObject(obj):
when lcDataFork > LightClientDataFork.None:
var res: seq[byte]
res.add(distinctBase(forkDigest))
res.add(SSZ.encode(forkyObject))
return res
else:
raiseAssert("No light client objects before Altair")
func encodeBootstrapForked*(
forkDigest: ForkDigest,
bootstrap: ForkedLightClientBootstrap): seq[byte] =
encodeForkedLightClientObject(bootstrap, forkDigest)
func encodeFinalityUpdateForked*(
forkDigest: ForkDigest,
finalityUpdate: ForkedLightClientFinalityUpdate): seq[byte] =
encodeForkedLightClientObject(finalityUpdate, forkDigest)
func encodeOptimisticUpdateForked*(
forkDigest: ForkDigest,
optimisticUpdate: ForkedLightClientOptimisticUpdate): seq[byte] =
encodeForkedLightClientObject(optimisticUpdate, forkDigest)
func encodeLightClientUpdatesForked*(
forkDigest: ForkDigest,
updates: openArray[ForkedLightClientUpdate]): seq[byte] =
var list: ForkedLightClientUpdateBytesList
for update in updates:
discard list.add(
ForkedLightClientUpdateBytes(
encodeForkedLightClientObject(update, forkDigest)))
SSZ.encode(list)
func decodeForkedLightClientObject(
ObjType: type SomeForkedLightClientObject,
forkDigests: ForkDigests,
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data: openArray[byte]): Result[ObjType, string] =
if len(data) < 4:
return Result[ObjType, string].err("Not enough data for forkDigest")
let
forkDigest = ForkDigest(array[4, byte].initCopyFrom(data))
contextFork = forkDigests.consensusForkForDigest(forkDigest).valueOr:
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return Result[ObjType, string].err("Unknown fork")
withLcDataFork(lcDataForkAtConsensusFork(contextFork)):
when lcDataFork > LightClientDataFork.None:
let res = decodeSsz(
data.toOpenArray(4, len(data) - 1), ObjType.Forky(lcDataFork))
if res.isOk:
# TODO:
# How can we verify the Epoch vs fork, e.g. with `consensusForkAtEpoch`?
# And should we?
var obj = ok ObjType(kind: lcDataFork)
obj.get.forky(lcDataFork) = res.get
obj
else:
Result[ObjType, string].err(res.error)
else:
Result[ObjType, string].err("Invalid Fork")
func decodeLightClientBootstrapForked*(
forkDigests: ForkDigests,
data: openArray[byte]): Result[ForkedLightClientBootstrap, string] =
decodeForkedLightClientObject(
ForkedLightClientBootstrap,
forkDigests,
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data
)
func decodeLightClientUpdateForked*(
forkDigests: ForkDigests,
data: openArray[byte]): Result[ForkedLightClientUpdate, string] =
decodeForkedLightClientObject(
ForkedLightClientUpdate,
forkDigests,
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data
)
func decodeLightClientFinalityUpdateForked*(
forkDigests: ForkDigests,
data: openArray[byte]): Result[ForkedLightClientFinalityUpdate, string] =
decodeForkedLightClientObject(
ForkedLightClientFinalityUpdate,
forkDigests,
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data
)
func decodeLightClientOptimisticUpdateForked*(
forkDigests: ForkDigests,
data: openArray[byte]): Result[ForkedLightClientOptimisticUpdate, string] =
decodeForkedLightClientObject(
ForkedLightClientOptimisticUpdate,
forkDigests,
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data
)
func decodeLightClientUpdatesByRange*(
forkDigests: ForkDigests,
data: openArray[byte]):
Result[ForkedLightClientUpdateList, string] =
let list = ? decodeSsz(data, ForkedLightClientUpdateBytesList)
var res: ForkedLightClientUpdateList
for encodedUpdate in list:
let update = ? decodeLightClientUpdateForked(
forkDigests, encodedUpdate.asSeq())
discard res.add(update)
ok(res)
func bootstrapContentKey*(blockHash: Digest): ContentKey =
ContentKey(
contentType: lightClientBootstrap,
lightClientBootstrapKey: LightClientBootstrapKey(blockHash: blockHash)
)
func updateContentKey*(startPeriod: uint64, count: uint64): ContentKey =
ContentKey(
contentType: lightClientUpdate,
lightClientUpdateKey: LightClientUpdateKey(
startPeriod: startPeriod, count: count)
)
func finalityUpdateContentKey*(finalizedSlot: uint64): ContentKey =
ContentKey(
contentType: lightClientFinalityUpdate,
lightClientFinalityUpdateKey: LightClientFinalityUpdateKey(
finalizedSlot: finalizedSlot
)
)
func optimisticUpdateContentKey*(optimisticSlot: uint64): ContentKey =
ContentKey(
contentType: lightClientOptimisticUpdate,
lightClientOptimisticUpdateKey: LightClientOptimisticUpdateKey(
optimisticSlot: optimisticSlot
)
)