mirror of
https://github.com/status-im/nimbus-eth1.git
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a1a9c6b027
* Merge AristoTxRef/KvtTxRef with their LayerRef also clean up unused files * rm unused test_rocksdb * Fix tests * lint
87 lines
2.5 KiB
Nim
87 lines
2.5 KiB
Nim
# nimbus-eth1
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# Copyright (c) 2023-2025 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 frames helper
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## ===================================
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##
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{.push raises: [].}
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import
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./[kvt_desc, kvt_layers]
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc txFrameBegin*(db: KvtDbRef, parent: KvtTxRef): KvtTxRef =
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## Starts a new transaction.
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##
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## Example:
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## ::
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## proc doSomething(db: KvtDbRef) =
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## let tx = db.begin
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## defer: tx.rollback()
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## ... continue using db ...
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## tx.commit()
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##
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let parent = if parent == nil: db.txRef else: parent
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KvtTxRef(
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db: db,
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parent: parent,
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)
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proc baseTxFrame*(db: KvtDbRef): KvtTxRef =
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db.txRef
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proc dispose*(
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tx: KvtTxRef;
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) =
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tx[].reset()
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proc txFramePersist*(
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db: KvtDbRef;
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batch: PutHdlRef;
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txFrame: KvtTxRef;
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) =
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let be = db.backend
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doAssert not be.isNil, "Persisting to backend requires ... a backend!"
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if txFrame != db.txRef:
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# Consolidate the changes from the old to the new base going from the
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# bottom of the stack to avoid having to cascade each change through
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# the full stack
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assert txFrame.parent != nil
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for frame in txFrame.stack():
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if frame == db.txRef:
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continue
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mergeAndReset(db.txRef, frame)
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frame.dispose()
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# Put the now-merged contents in txFrame and make it the new base
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swap(db.txRef[], txFrame[])
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db.txRef = txFrame
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# Store structural single trie entries
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for k,v in txFrame.sTab:
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be.putKvpFn(batch, k, v)
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# TODO above, we only prepare the changes to the database but don't actually
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# write them to disk - the code below that updates the frame should
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# really run after things have been written (to maintain sync betweeen
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# in-memory and on-disk state)
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# Done with txRef, all saved to backend
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txFrame.sTab.clear()
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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