117 lines
3.4 KiB
Nim
117 lines
3.4 KiB
Nim
# Nimbus
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# Copyright (c) 2021-2022 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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# https://github.com/ethereum/portal-network-specs/blob/master/history-network.md#content-keys-and-values
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{.push raises: [Defect].}
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import
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std/[options, math],
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nimcrypto/[sha2, hash], stew/byteutils, stint,
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ssz_serialization,
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../../common/common_types
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export ssz_serialization, common_types, hash
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## Types and calls for history network content keys
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const
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# Maximum content key size:
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# - 32 bytes for SSZ serialized `BlockKey`
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# - 1 byte for `ContentType`
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# TODO: calculate it somehow from the object definition (macro?)
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maxContentKeySize* = 33
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type
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ContentType* = enum
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blockHeader = 0x00
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blockBody = 0x01
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receipts = 0x02
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epochAccumulator = 0x03
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BlockKey* = object
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blockHash*: BlockHash
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EpochAccumulatorKey* = object
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epochHash*: Digest # TODO: Perhaps this should be called epochRoot in the spec instead
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ContentKey* = object
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case contentType*: ContentType
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of blockHeader:
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blockHeaderKey*: BlockKey
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of blockBody:
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blockBodyKey*: BlockKey
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of receipts:
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receiptsKey*: BlockKey
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of epochAccumulator:
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epochAccumulatorKey*: EpochAccumulatorKey
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func encode*(contentKey: ContentKey): ByteList =
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ByteList.init(SSZ.encode(contentKey))
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func decode*(contentKey: ByteList): Option[ContentKey] =
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try:
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some(SSZ.decode(contentKey.asSeq(), ContentKey))
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except SszError:
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return none[ContentKey]()
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func toContentId*(contentKey: ByteList): ContentId =
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# TODO: Should we try to parse the content key here for invalid ones?
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let idHash = sha2.sha256.digest(contentKey.asSeq())
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readUintBE[256](idHash.data)
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func toContentId*(contentKey: ContentKey): ContentId =
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toContentId(encode(contentKey))
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func `$`*(x: BlockHash): string =
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"0x" & x.data.toHex()
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func `$`*(x: BlockKey): string =
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"blockHash: " & $x.blockHash
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func `$`*(x: ContentKey): string =
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var res = "(type: " & $x.contentType & ", "
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case x.contentType:
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of blockHeader:
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res.add($x.blockHeaderKey)
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of blockBody:
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res.add($x.blockBodyKey)
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of receipts:
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res.add($x.receiptsKey)
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of epochAccumulator:
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let key = x.epochAccumulatorKey
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res.add("epochHash: " & $key.epochHash)
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res.add(")")
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res
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## Types for history network content
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const
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MAX_TRANSACTION_LENGTH* = 2^24 # ~= 16 million
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MAX_TRANSACTION_COUNT* = 2^14 # ~= 16k
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MAX_RECEIPT_LENGTH* = 2^27 # ~= 134 million
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MAX_HEADER_LENGTH = 2^13 # = 8192
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MAX_ENCODED_UNCLES_LENGTH* = MAX_HEADER_LENGTH * 2^4 # = 2**17 ~= 131k
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type
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## Types for content
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# TODO: Using `init` on these lists appears to fail because of the constants
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# that are used? Strange.
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TransactionByteList* = List[byte, MAX_TRANSACTION_LENGTH] # RLP data
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Transactions* = List[TransactionByteList, MAX_TRANSACTION_COUNT]
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Uncles* = List[byte, MAX_ENCODED_UNCLES_LENGTH] # RLP data
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BlockBodySSZ* = object
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transactions*: Transactions
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uncles*: Uncles
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ReceiptByteList* = List[byte, MAX_RECEIPT_LENGTH] # RLP data
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ReceiptsSSZ* = List[ReceiptByteList, MAX_TRANSACTION_COUNT]
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