103 lines
3.5 KiB
Nim
103 lines
3.5 KiB
Nim
# Fluffy
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# Copyright (c) 2023-2024 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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# As per spec:
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# https://github.com/ethereum/portal-network-specs/blob/master/state-network.md#content-keys-and-content-ids
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{.push raises: [].}
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import
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nimcrypto/[hash, sha2, keccak],
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results,
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stint,
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eth/common/eth_types,
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ssz_serialization,
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./nibbles
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export ssz_serialization, common_types, hash, results
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type
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NodeHash* = KeccakHash
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CodeHash* = KeccakHash
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Address* = EthAddress
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ContentType* = enum
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# Note: Need to add this unused value as a case object with an enum without
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# a 0 valueis not allowed: "low(contentType) must be 0 for discriminant".
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# For prefix values that are in the enum gap, the deserialization will fail
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# at runtime as is wanted.
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# In the future it might be possible that this will fail at compile time for
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# the SSZ Union type, but currently it is allowed in the implementation, and
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# the SSZ spec is not explicit about disallowing this.
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unused = 0x00
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accountTrieNode = 0x20
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contractTrieNode = 0x21
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contractCode = 0x22
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AccountTrieNodeKey* = object
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path*: Nibbles
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nodeHash*: NodeHash
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ContractTrieNodeKey* = object
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address*: Address
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path*: Nibbles
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nodeHash*: NodeHash
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ContractCodeKey* = object
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address*: Address
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codeHash*: CodeHash
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ContentKey* = object
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case contentType*: ContentType
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of unused:
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discard
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of accountTrieNode:
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accountTrieNodeKey*: AccountTrieNodeKey
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of contractTrieNode:
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contractTrieNodeKey*: ContractTrieNodeKey
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of contractCode:
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contractCodeKey*: ContractCodeKey
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func init*(T: type AccountTrieNodeKey, path: Nibbles, nodeHash: NodeHash): T =
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AccountTrieNodeKey(path: path, nodeHash: nodeHash)
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func init*(
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T: type ContractTrieNodeKey, address: Address, path: Nibbles, nodeHash: NodeHash
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): T =
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ContractTrieNodeKey(address: address, path: path, nodeHash: nodeHash)
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func init*(T: type ContractCodeKey, address: Address, codeHash: CodeHash): T =
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ContractCodeKey(address: address, codeHash: codeHash)
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func toContentKey*(key: AccountTrieNodeKey): ContentKey =
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ContentKey(contentType: accountTrieNode, accountTrieNodeKey: key)
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func toContentKey*(key: ContractTrieNodeKey): ContentKey =
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ContentKey(contentType: contractTrieNode, contractTrieNodeKey: key)
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func toContentKey*(key: ContractCodeKey): ContentKey =
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ContentKey(contentType: contractCode, contractCodeKey: key)
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proc readSszBytes*(data: openArray[byte], val: var ContentKey) {.raises: [SszError].} =
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mixin readSszValue
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if data.len() > 0 and data[0] == ord(unused):
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raise newException(MalformedSszError, "SSZ selector is unused value")
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readSszValue(data, val)
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func encode*(contentKey: ContentKey): ContentKeyByteList =
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doAssert(contentKey.contentType != unused)
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ContentKeyByteList.init(SSZ.encode(contentKey))
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func decode*(T: type ContentKey, contentKey: ContentKeyByteList): Result[T, string] =
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decodeSsz(contentKey.asSeq(), T)
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func toContentId*(contentKey: ContentKeyByteList): ContentId =
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# TODO: Should we try to parse the content key here for invalid ones?
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let idHash = sha256.digest(contentKey.asSeq())
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readUintBE[256](idHash.data)
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