nimbus-eth1/fluffy/network/history/history_content.nim

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# Nimbus
# Copyright (c) 2021-2022 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/history-network.md#content-keys-and-values
{.push raises: [Defect].}
import
std/options,
nimcrypto/[sha2, hash], stew/byteutils, stint,
ssz_serialization,
../../common/common_types
export ssz_serialization, common_types
type
ContentType* = enum
blockHeader = 0x00
blockBody = 0x01
receipts = 0x02
ContentKeyType* = object
chainId*: uint16
blockHash*: BlockHash
ContentKey* = object
case contentType*: ContentType
of blockHeader:
blockHeaderKey*: ContentKeyType
of blockBody:
blockBodyKey*: ContentKeyType
of receipts:
receiptsKey*: ContentKeyType
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.sha_256.digest(contentKey.asSeq())
readUintBE[256](idHash.data)
func toContentId*(contentKey: ContentKey): ContentId =
toContentId(encode(contentKey))
func `$`*(x: BlockHash): string =
"0x" & x.data.toHex()
func `$`*(x: ContentKey): string =
let key =
case x.contentType:
of blockHeader:
x.blockHeaderKey
of blockBody:
x.blockBodyKey
of receipts:
x.receiptsKey
"(contentType: " & $x.contentType &
", blockHash: " & $key.blockHash &
", chainId: " & $key.chainId & ")"