150 lines
4.7 KiB
Nim
150 lines
4.7 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 -- Transaction stow/save helper
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## =========================================
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##
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{.push raises: [].}
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import
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std/tables,
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results,
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../aristo_delta/delta_merge,
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".."/[aristo_desc, aristo_get, aristo_delta, aristo_layers, aristo_hashify]
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# ------------------------------------------------------------------------------
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# Private functions
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# ------------------------------------------------------------------------------
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proc getBeStateRoot(
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db: AristoDbRef;
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chunkedMpt: bool;
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): Result[HashKey,AristoError] =
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## Get the Merkle hash key for the current backend state root and check
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## validity of top layer.
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let srcRoot = block:
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let rc = db.getKeyBE VertexID(1)
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if rc.isOk:
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rc.value
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elif rc.error == GetKeyNotFound:
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VOID_HASH_KEY
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else:
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return err(rc.error)
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if db.top.delta.kMap.getOrVoid(VertexID 1).isValid:
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return ok(srcRoot)
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elif not db.top.delta.kMap.hasKey(VertexID 1) and
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not db.top.delta.sTab.hasKey(VertexID 1):
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# This layer is unusable, need both: vertex and key
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return err(TxPrettyPointlessLayer)
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ok(srcRoot)
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#elif not db.top.delta.sTab.getOrVoid(VertexID 1).isValid:
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# # Root key and vertex have been deleted
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# return ok(srcRoot)
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#
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#elif chunkedMpt and srcRoot == db.top.delta.kMap.getOrVoid VertexID(1):
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# # FIXME: this one needs to be double checked with `snap` sunc preload
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# return ok(srcRoot)
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#
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#err(TxStateRootMismatch)
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proc topMerge(db: AristoDbRef; src: HashKey): Result[void,AristoError] =
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## Merge the `top` layer into the read-only balacer layer.
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let ubeRoot = block:
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let rc = db.getKeyUbe VertexID(1)
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if rc.isOk:
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rc.value
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elif rc.error == GetKeyNotFound:
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VOID_HASH_KEY
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else:
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return err(rc.error)
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# Update layer for merge call
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db.top.delta.src = src
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# This one will return the `db.top.delta` if `db.balancer.isNil`
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db.balancer = db.deltaMerge(db.top.delta, db.balancer, ubeRoot).valueOr:
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return err(error[1])
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ok()
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc txStow*(
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db: AristoDbRef; # Database
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nxtSid: uint64; # Next state ID (aka block number)
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persistent: bool; # Stage only unless `true`
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chunkedMpt: bool; # Partial data (e.g. from `snap`)
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): Result[void,AristoError] =
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## Worker for `stow()` and `persist()` variants.
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##
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if not db.txRef.isNil:
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return err(TxPendingTx)
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if 0 < db.stack.len:
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return err(TxStackGarbled)
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if persistent and not db.deltaPersistentOk():
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return err(TxBackendNotWritable)
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# Verify database consistency and get `src` field for update
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let rc = db.getBeStateRoot chunkedMpt
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if rc.isErr and rc.error != TxPrettyPointlessLayer:
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return err(rc.error)
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# Special treatment for `snap` proofs (aka `chunkedMpt`)
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let final =
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if chunkedMpt: LayerFinalRef(fRpp: db.top.final.fRpp)
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else: LayerFinalRef()
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# Move/merge/install `top` layer onto `balancer`
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if rc.isOk:
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db.topMerge(rc.value).isOkOr:
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return err(error)
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# New empty top layer (probably with `snap` proofs and `vTop` carry over)
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db.top = LayerRef(
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delta: LayerDeltaRef(),
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final: final)
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if db.balancer.isValid:
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db.top.delta.vTop = db.balancer.vTop
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else:
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let rc = db.getTuvUbe()
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if rc.isOk:
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db.top.delta.vTop = rc.value
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else:
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# It is OK if there was no `vTop`. Otherwise something serious happened
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# and there is no way to recover easily.
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doAssert rc.error == GetTuvNotFound
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elif db.top.delta.sTab.len != 0 and
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not db.top.delta.sTab.getOrVoid(VertexID(1)).isValid:
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# Currently, a `VertexID(1)` root node is required
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return err(TxAccRootMissing)
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if persistent:
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# Merge/move `balancer` into persistent tables
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? db.deltaPersistent nxtSid
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# New empty top layer (probably with `snap` proofs carry over)
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db.top = LayerRef(
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delta: LayerDeltaRef(vTop: db.vTop),
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final: final,
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txUid: db.top.txUid)
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ok()
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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