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https://github.com/status-im/nimbus-eth1.git
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5ac362fe6f
* Aristo: Merge `delta_siblings` module into `deltaPersistent()` * Aristo: Add `isEmpty()` for canonical checking whether a layer is empty * Aristo: Merge `LayerDeltaRef` into `LayerObj` why: No need to maintain nested object refs anymore. Previously the `LayerDeltaRef` object had a companion `LayerFinalRef` which held non-delta layer information. * Kvt: Merge `LayerDeltaRef` into `LayerRef` why: No need to maintain nested object refs (as with `Aristo`) * Kvt: Re-write balancer logic similar to `Aristo` why: Although `Kvt` was a cheap copy of `Aristo` it sort of got out of sync and the balancer code was wrong. * Update iterator over forked peers why: Yield additional field `isLast` indicating that the last iteration cycle was approached. * Optimise balancer calculation. why: One can often avoid providing a new object containing the merge of two layers for the balancer. This avoids copying tables. In some cases this is replaced by `hasKey()` look ups though. One uses one of the two to combine and merges the other into the first. Of course, this needs some checks for making sure that none of the components to merge is eventually shared with something else. * Fix copyright year
70 lines
2.4 KiB
Nim
70 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 -- 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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results,
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../aristo_delta/delta_merge,
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".."/[aristo_desc, aristo_delta, aristo_layers]
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# ------------------------------------------------------------------------------
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# Private functions
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# ------------------------------------------------------------------------------
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proc txStowOk*(
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db: AristoDbRef; # Database
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persistent: bool; # Stage only unless `true`
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): Result[void,AristoError] =
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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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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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): Result[void,AristoError] =
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## Worker for `stow()` and `persist()` variants.
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##
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? db.txStowOk persistent
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if not db.top.isEmpty():
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# Note that `deltaMerge()` will return the `db.top` argument if the
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# `db.balancer` is `nil`. Also, the `db.balancer` is read-only. In the
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# case that there are no forked peers one can ignore that restriction as
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# no balancer is shared.
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db.balancer = deltaMerge(
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db.top, modUpperOk = true, db.balancer, modLowerOk = db.nForked()==0)
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# New empty top layer
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db.top = LayerRef(vTop: db.balancer.vTop)
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if persistent:
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# Merge/move `balancer` into persistent tables (unless missing)
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? db.deltaPersistent nxtSid
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ok()
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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