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a84a2131cd
* Imported/rebase from `no-ext`, PR #2485 Store extension nodes together with the branch Extension nodes must be followed by a branch - as such, it makes sense to store the two together both in the database and in memory: * fewer reads, writes and updates to traverse the tree * simpler logic for maintaining the node structure * less space used, both memory and storage, because there are fewer nodes overall There is also a downside: hashes can no longer be cached for an extension - instead, only the extension+branch hash can be cached - this seems like a fine tradeoff since computing it should be fast. TODO: fix commented code * Fix merge functions and `toNode()` * Update `merkleSignCommit()` prototype why: Result is always a 32bit hash * Update short Merkle hash key generation details: Ethereum reference MPTs use Keccak hashes as node links if the size of an RLP encoded node is at least 32 bytes. Otherwise, the RLP encoded node value is used as a pseudo node link (rather than a hash.) This is specified in the yellow paper, appendix D. Different to the `Aristo` implementation, the reference MPT would not store such a node on the key-value database. Rather the RLP encoded node value is stored instead of a node link in a parent node is stored as a node link on the parent database. Only for the root hash, the top level node is always referred to by the hash. * Fix/update `Extension` sections why: Were commented out after removal of a dedicated `Extension` type which left the system disfunctional. * Clean up unused error codes * Update unit tests * Update docu --------- Co-authored-by: Jacek Sieka <jacek@status.im>
83 lines
2.4 KiB
Nim
83 lines
2.4 KiB
Nim
# nimbus-eth1
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# Copyright (c) 2023-2024 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed
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# except according to those terms.
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## Aristo DB -- Sign Helper
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## ========================
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##
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{.push raises: [].}
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import
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eth/common,
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results,
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"."/[aristo_compute, aristo_desc, aristo_get, aristo_init,
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aristo_delete, aristo_merge]
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# ------------------------------------------------------------------------------
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# Public functions, signature generator
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# ------------------------------------------------------------------------------
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proc merkleSignBegin*(): MerkleSignRef =
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## Start signature calculator for a list of key-value items.
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let
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db = AristoDbRef.init VoidBackendRef
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vid = VertexID(2)
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MerkleSignRef(
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root: vid,
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db: db)
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proc merkleSignAdd*(
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sdb: MerkleSignRef;
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key: openArray[byte];
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val: openArray[byte];
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) =
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## Add key-value item to the signature list. The order of the items to add
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## is irrelevant.
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if sdb.error == AristoError(0):
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sdb.count.inc
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discard sdb.db.mergeGenericData(sdb.root, key, val).valueOr:
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sdb.`error` = error
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sdb.errKey = @key
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return
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proc merkleSignDelete*(
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sdb: MerkleSignRef;
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key: openArray[byte];
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) =
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## Add key-value item to the signature list. The order of the items to add
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## is irrelevant.
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if sdb.error == AristoError(0):
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sdb.count.inc
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discard sdb.db.deleteGenericData(sdb.root, key).valueOr:
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sdb.`error` = error
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sdb.errKey = @key
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return
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proc merkleSignCommit*(
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sdb: MerkleSignRef;
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): Result[Hash256,(Blob,AristoError)] =
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## Finish with the list, calculate signature and return it.
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if sdb.count == 0:
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return ok EMPTY_ROOTHASH
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if sdb.error != AristoError(0):
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return err((sdb.errKey, sdb.error))
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let sign = sdb.db.computeKey((sdb.root, sdb.root)).valueOr:
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if error == GetVtxNotFound:
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if not sdb.db.getVtx((sdb.root, sdb.root)).isValid:
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return ok EMPTY_ROOTHASH
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raiseAssert "merkleSignCommit(): " & $error
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ok sign.to(Hash256)
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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