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54f784bef1
* Aristo: Generalise alien/guest interface for piggiback on database * Aristo: Code cosmetics * CoreDb+Kvt: Update transaction API why: Use single addressable function `forkTx(backLevel: int)` as used in `Aristo`. So `Kvt` can be synced simultaneously to `Aristo`. also: Refactored `kvt_tx.nim` in a similar fashion to `Aristo`. * Kvt: Replace `LayerDelta` object by reference why: Will be needed when introducing filters * Kvt: Remodel backend filter facility similar to `Aristo` why: This allows to operate on several KVT instances simultaneously. * CoreDb+Kvt: Fix on-disk storage why: Overlooked name change: `stow()` => `persist()` for permanent storage * Fix copyright headers
56 lines
1.7 KiB
Nim
56 lines
1.7 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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## Kvt 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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".."/[kvt_desc, kvt_filter]
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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: KvtDbRef; # Database
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persistent: bool; # Stage only unless `true`
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): Result[void,KvtError] =
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## The function saves the data from the top layer cache into the
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## backend database.
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##
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## If there is no backend the function returns immediately with an error.
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## The same happens if there is a pending transaction.
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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.filterUpdateOk():
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return err(TxBackendNotWritable)
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if 0 < db.top.delta.sTab.len:
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db.filterMerge db.top.delta
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db.top.delta = LayerDeltaRef()
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if persistent:
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# Move `roFilter` data into persistent tables
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? db.filterUpdate()
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ok()
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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