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https://github.com/status-im/nimbus-eth1.git
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3e88589eb1
* Split off `ReadOnlyStateDB` from `AccountStateDB` from `state_db.nim`
why:
Apart from testing, applications use `ReadOnlyStateDB` as an easy
way to access the accounts ledger. This is well supported by the
`Aristo` db, but writable mode is only parially supported.
The writable AccountStateDB` object for modifying accounts is not
used by production code.
So, for lecgacy and testing apps, the full support of the previous
`AccountStateDB` is now enabled by `import db/state_db/read_write`
and the `import db/state_db` provides read-only mode.
* Encapsulate `AccountStateDB` as `GenesisLedgerRef` or genesis creation
why:
`AccountStateDB` has poor support for `Aristo` and is not widely used
in favour of `AccountsLedger` (which will be abstracted as `ledger`.)
Currently, using other than the `AccountStateDB` ledgers within the
`GenesisLedgerRef` wrapper is experimental and test only. Eventually,
the wrapper should disappear so that the `Ledger` object (which
encapsulates `AccountsCache` and `AccountsLedger`) will prevail.
* For the `Ledger`, provide access to raw accounts `MPT`
why:
This gives to the `CoreDbMptRef` descriptor from the `CoreDb` (which is
the legacy version of CoreDxMptRef`.) For the new `ledger` API, the
accounts are based on the `CoreDxMAccRef` descriptor which uses a
particular sub-system for accounts while legacy applications use the
`CoreDbPhkRef` equivalent of the `SecureHexaryTrie`.
The only place where this feature will currently be used is the
`genesis.nim` source file.
* Fix `Aristo` bugs, missing boundary checks, typos, etc.
* Verify root vertex in `MPT` and account constructors
why:
Was missing so far, in particular the accounts constructor must
verify `VertexID(1)
* Fix include file
96 lines
2.9 KiB
Nim
96 lines
2.9 KiB
Nim
# nimbus-eth1
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# Copyright (c) 2023 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 -- Obects Retrival Via Traversal Path
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## ===============================================
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##
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{.push raises: [].}
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import
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eth/trie/nibbles,
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results,
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"."/[aristo_desc, aristo_hike]
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const
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AcceptableHikeStops = {
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HikeBranchTailEmpty,
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HikeBranchBlindEdge,
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HikeExtTailEmpty,
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HikeExtTailMismatch}
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# ------------------------------------------------------------------------------
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# Private functions
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# ------------------------------------------------------------------------------
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proc fetchPayloadImpl(
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rc: Result[Hike,(Hike,AristoError)];
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): Result[PayloadRef,(VertexID,AristoError)] =
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if rc.isErr:
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let vid =
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if rc.error[0].legs.len == 0: VertexID(0)
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else: rc.error[0].legs[^1].wp.vid
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if rc.error[1] in AcceptableHikeStops:
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return err((vid, FetchPathNotFound))
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return err((vid, rc.error[1]))
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if rc.value.legs.len == 0:
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return err((VertexID(0), FetchPathNotFound))
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ok rc.value.legs[^1].wp.vtx.lData
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proc fetchPayloadImpl(
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db: AristoDbRef;
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root: VertexID;
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path: openArray[byte];
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): Result[PayloadRef,(VertexID,AristoError)] =
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path.initNibbleRange.hikeUp(root, db).fetchPayloadImpl
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc fetchPayload*(
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db: AristoDbRef;
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key: LeafTie;
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): Result[PayloadRef,(VertexID,AristoError)] =
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## Cascaded attempt to traverse the `Aristo Trie` and fetch the value of a
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## leaf vertex. This function is complementary to `merge()`.
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##
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key.hikeUp(db).fetchPayloadImpl
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proc fetchPayload*(
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db: AristoDbRef;
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root: VertexID;
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path: openArray[byte];
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): Result[PayloadRef,(VertexID,AristoError)] =
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## Variant of `fetchPayload()`
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##
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if path.len == 0:
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return err((VertexID(0),LeafKeyInvalid))
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db.fetchPayloadImpl(root, path)
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proc hasPath*(
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db: AristoDbRef; # Database
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root: VertexID;
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path: openArray[byte]; # Key of database record
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): Result[bool,(VertexID,AristoError)] =
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## Variant of `fetchPayload()`
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##
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if path.len == 0:
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return err((VertexID(0),LeafKeyInvalid))
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let rc = db.fetchPayloadImpl(root, path)
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if rc.isOk:
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return ok(true)
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if rc.error[1] == FetchPathNotFound:
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return ok(false)
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err(rc.error)
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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