nimbus-eth1/fluffy/network/beacon_light_client/light_client_content.nim

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# Nimbus - Portal Network
# Copyright (c) 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
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std/[sequtils, 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
lightClientBootstrap = 0x00
lightClientUpdate = 0x01
lightClientFinalityUpdate = 0x02
lightClientOptimisticUpdate = 0x03
# TODO Consider how we will gossip bootstraps?
# In normal LC operation node trust only one offered bootstrap, therefore offers
# of any other bootstraps would be rejected.
LightClientBootstrapKey* = object
blockHash*: Digest
LightClientUpdateKey* = object
startPeriod*: uint64
count*: uint64
# TODO Following types are not yet included in spec
# optimisticSlot - slot of attested header of the update
# finalSlot - slot of finalized header of the update
LightClientFinalityUpdateKey* = object
optimisticSlot: uint64
finalSlot: uint64
# optimisticSlot - slot of attested header of the update
LightClientOptimisticUpdateKey* = object
optimisticSlot: uint64
ContentKey* = object
case contentType*: ContentType
of lightClientBootstrap:
lightClientBootstrapKey*: LightClientBootstrapKey
of lightClientUpdate:
lightClientUpdateKey*: LightClientUpdateKey
of lightClientFinalityUpdate:
lightClientFinalityUpdateKey*: LightClientFinalityUpdateKey
of lightClientOptimisticUpdate:
lightClientOptimisticUpdateKey*: LightClientOptimisticUpdateKey
ForkedLightClientUpdateBytes* = List[byte, MAX_LIGHT_CLIENT_UPDATE_SIZE]
LightClientUpdateList* = List[ForkedLightClientUpdateBytes, MAX_REQUEST_LIGHT_CLIENT_UPDATES]
func encode*(contentKey: ContentKey): ByteList =
ByteList.init(SSZ.encode(contentKey))
func decode*(contentKey: ByteList): Option[ContentKey] =
try:
some(SSZ.decode(contentKey.asSeq(), ContentKey))
except SszError:
return 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))
proc decodeBootstrap(
data: openArray[byte]): Result[altair.LightClientBootstrap, string] =
try:
let decoded = SSZ.decode(
data,
altair.LightClientBootstrap
)
return ok(decoded)
except SszError as exc:
return err(exc.msg)
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proc decodeLighClientObject(
ObjType: type altair.SomeLightClientObject,
data: openArray[byte]): Result[ObjType, string] =
try:
let decoded = SSZ.decode(
data,
ObjType
)
return ok(decoded)
except SszError as exc:
return err(exc.msg)
proc encodeForked*(
ObjType: type altair.SomeLightClientObject,
fork: ForkDigest,
obj: ObjType): seq[byte] =
# TODO probably not super efficient
let arr = distinctBase(fork)
let enc = SSZ.encode(obj)
return concat(@arr, enc)
proc encodeBootstrapForked*(
fork: ForkDigest,
bs: altair.LightClientBootstrap): seq[byte] =
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return encodeForked(altair.LightClientBootstrap, fork, bs)
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proc encodeFinalityUpdateForked*(
fork: ForkDigest,
update: altair.LightClientFinalityUpdate): seq[byte] =
return encodeForked(altair.LightClientFinalityUpdate, fork, update)
proc encodeOptimisticUpdateForked*(
fork: ForkDigest,
update: altair.LightClientOptimisticUpdate): seq[byte] =
return encodeForked(altair.LightClientOptimisticUpdate, fork, update)
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proc decodeForkedLightClientObject(
ObjType: type altair.SomeLightClientObject,
forks: ForkDigests,
data: openArray[byte]): Result[ObjType, string] =
if len(data) < 4:
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return Result[ObjType, string].err("Too short data")
let
arr = ForkDigest(array[4, byte].initCopyFrom(data))
beaconFork = forks.stateForkForDigest(arr).valueOr:
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return Result[ObjType, string].err("Unknown fork")
if beaconFork >= BeaconStateFork.Altair:
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return decodeLighClientObject(ObjType, data.toOpenArray(4, len(data) - 1))
else:
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return Result[ObjType, string].err(
"LighClient data is avaialable only after Altair fork"
)
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proc decodeBootstrapForked*(
forks: ForkDigests,
data: openArray[byte]): Result[altair.LightClientBootstrap, string] =
return decodeForkedLightClientObject(
altair.LightClientBootstrap,
forks,
data
)
proc decodeLightClientUpdateForked*(
forks: ForkDigests,
data: openArray[byte]): Result[altair.LightClientUpdate, string] =
return decodeForkedLightClientObject(
altair.LightClientUpdate,
forks,
data
)
proc decodeLightClientFinalityUpdateForked*(
forks: ForkDigests,
data: openArray[byte]): Result[altair.LightClientFinalityUpdate, string] =
return decodeForkedLightClientObject(
altair.LightClientFinalityUpdate,
forks,
data
)
proc decodeLightClientOptimisticUpdateForked*(
forks: ForkDigests,
data: openArray[byte]): Result[altair.LightClientOptimisticUpdate, string] =
return decodeForkedLightClientObject(
altair.LightClientOptimisticUpdate,
forks,
data
)
proc encodeLightClientUpdatesForked*(
fork: ForkDigest,
objects: openArray[altair.LightClientUpdate]
): seq[byte] =
var lu: LightClientUpdateList
for obj in objects:
discard lu.add(
ForkedLightClientUpdateBytes(encodeForked(altair.LightClientUpdate, fork, obj))
)
return SSZ.encode(lu)
proc decodeLightClientUpdatesForkedAsList*(
data: openArray[byte]): Result[LightClientUpdateList, string] =
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try:
let listDecoded = SSZ.decode(
data,
LightClientUpdateList
)
return ok(listDecoded)
except SszError as exc:
return err(exc.msg)
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proc decodeLightClientUpdatesForked*(
forks: ForkDigests,
data: openArray[byte]): Result[seq[altair.LightClientUpdate], string] =
let listDecoded = ? decodeLightClientUpdatesForkedAsList(data)
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var updates: seq[altair.LightClientUpdate]
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for enc in listDecoded:
let updateDecoded = ? decodeLightClientUpdateForked(forks, enc.asSeq())
updates.add(updateDecoded)
return ok(updates)
func bootstrapContentKey*(bh: Digest): ContentKey =
ContentKey(
contentType: lightClientBootstrap,
lightClientBootstrapKey: LightClientBootstrapKey(blockHash: bh)
)
func updateContentKey*(startPeriod: uint64, count: uint64): ContentKey =
ContentKey(
contentType: lightClientUpdate,
lightClientUpdateKey: LightClientUpdateKey(startPeriod: startPeriod, count: count)
)
func finalityUpdateContentKey*(finalSlot: uint64, optimisticSlot: uint64): ContentKey =
ContentKey(
contentType: lightClientFinalityUpdate,
lightClientFinalityUpdateKey: LightClientFinalityUpdateKey(
optimisticSlot: optimisticSlot,
finalSlot: finalSlot
)
)
func optimisticUpdateContentKey*(optimisticSlot: uint64): ContentKey =
ContentKey(
contentType: lightClientOptimisticUpdate,
lightClientOptimisticUpdateKey: LightClientOptimisticUpdateKey(
optimisticSlot: optimisticSlot
)
)