nimbus-eth1/fluffy/network/header/header_content.nim

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# Nimbus
# 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.
# https://github.com/ethereum/portal-network-specs/blob/master/header-gossip-network.md
{.push raises: [Defect].}
import
std/options,
nimcrypto/[sha2, hash], stint,
ssz_serialization,
../../common/common_types
export ssz_serialization, common_types, options, hash
type
# Header Gossip Content Keys
# https://github.com/ethereum/portal-network-specs/blob/master/header-gossip-network.md#content-keys
# But with Accumulator removed as per
# https://github.com/ethereum/portal-network-specs/issues/153
ContentType* = enum
newBlockHeader = 0x00
NewBlockHeaderKey* = object
blockHash*: BlockHash
blockNumber*: UInt256
ContentKey* = object
case contentType*: ContentType
of newBlockHeader:
newBlockHeaderKey*: NewBlockHeaderKey
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))