nimbus-eth1/nimbus/db/kvt/kvt_tx/tx_stow.nim

65 lines
1.9 KiB
Nim
Raw Normal View History

# nimbus-eth1
# Copyright (c) 2023-2024 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
# http://www.apache.org/licenses/LICENSE-2.0)
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
# http://opensource.org/licenses/MIT)
# at your option. This file may not be copied, modified, or distributed
# except according to those terms.
## Kvt DB -- Transaction stow/save helper
## ======================================
##
{.push raises: [].}
import
std/tables,
results,
".."/[kvt_desc, kvt_delta]
# ------------------------------------------------------------------------------
# Public functions
# ------------------------------------------------------------------------------
proc txStowOk*(
db: KvtDbRef; # Database
persistent: bool; # Stage only unless `true`
): Result[void,KvtError] =
## Verify that `txStow()` can go ahead
if not db.txRef.isNil:
return err(TxPendingTx)
if 0 < db.stack.len:
return err(TxStackGarbled)
if persistent and not db.deltaUpdateOk():
return err(TxBackendNotWritable)
ok()
proc txStow*(
db: KvtDbRef; # Database
persistent: bool; # Stage only unless `true`
): Result[void,KvtError] =
## The function saves the data from the top layer cache into the
## backend database.
##
## If there is no backend the function returns immediately with an error.
## The same happens if there is a pending transaction.
##
? db.txStowOk persistent
if 0 < db.top.delta.sTab.len:
db.deltaMerge db.top.delta
db.top.delta = LayerDeltaRef()
if persistent:
# Move `balancer` data into persistent tables
? db.deltaUpdate()
ok()
# ------------------------------------------------------------------------------
# End
# ------------------------------------------------------------------------------