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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
46 lines
1.5 KiB
Nim
46 lines
1.5 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 -- structural data types
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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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eth/common
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type
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LayerDeltaRef* = ref object
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## Delta tables relative to previous layer
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sTab*: Table[Blob,Blob] ## Structural data table
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LayerRef* = ref object
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## Kvt database layer structures. Any layer holds the full
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## change relative to the backend.
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delta*: LayerDeltaRef ## Structural tables held as deltas
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txUid*: uint ## Transaction identifier if positive
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# ------------------------------------------------------------------------------
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# Public helpers (misc)
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# ------------------------------------------------------------------------------
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func init*(T: type LayerRef): T =
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## Constructor, returns empty layer
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T(delta: LayerDeltaRef())
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func dup*(ly: LayerDeltaRef): LayerDeltaRef =
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## Duplicate/copy
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LayerDeltaRef(sTab: ly.sTab)
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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