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

64 lines
1.8 KiB
Nim
Raw Normal View History

# Nimbus
# Copyright (c) 2021 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/objects, stint,
ssz_serialization,
../../common/common_types
export ssz_serialization, common_types
type
ContentType* = enum
BlockHeader = 0x01
BlockBody = 0x02
Receipts = 0x03
BlockHash* = MDigest[32 * 8] # Bytes32
ContentKey* = object
chainId*: uint16
contentType*: ContentType
blockHash*: BlockHash
ContentId* = Uint256
template toSszType*(x: ContentType): uint8 =
uint8(x)
func fromSszBytes*(T: type ContentType, data: openArray[byte]):
T {.raises: [MalformedSszError, Defect].} =
if data.len != sizeof(uint8):
raiseIncorrectSize T
var contentType: T
if not checkedEnumAssign(contentType, data[0]):
raiseIncorrectSize T
contentType
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 =
let idHash = sha2.sha_256.digest(contentKey.asSeq())
readUintBE[256](idHash.data)
func toContentId*(contentKey: ContentKey): ContentId =
toContentId(encode(contentKey))