71 lines
2.3 KiB
Nim
71 lines
2.3 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_delta/delta_merge,
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".."/[kvt_desc, kvt_delta]
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc txStowOk*(
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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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## Verify that `txStow()` can go ahead
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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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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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? db.txStowOk persistent
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if 0 < db.top.sTab.len:
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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()
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if persistent:
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# Move `balancer` data into persistent tables
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? db.deltaPersistent()
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ok()
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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