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https://github.com/status-im/nimbus-eth1.git
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42bb640443
By introducing the "shared rocksdb instance" concept to the backend, we can remove the "piggybacking" mode , thus reducing the complexity of database initialisation and opening the possibility of extending how write batching works across kvt/aristo. The change makes explicit the hidden shared state that was previously hiding in closures and provides the first step towards simplifying the "commit/persist" interface of coredb, preparing it for optimizations to reduce the "layering tax" that `forked-layers` introduced.
81 lines
2.5 KiB
Nim
81 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 -- key-value table
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## =========================
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##
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{.push raises: [].}
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import
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std/[hashes, tables],
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./kvt_constants,
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./kvt_desc/[desc_error, desc_structural]
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from ./kvt_desc/desc_backend
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import BackendRef, PutHdlRef
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# Not auto-exporting backend
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export
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hashes, tables, kvt_constants, desc_error, desc_structural, PutHdlRef
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type
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KvtTxRef* = ref object
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## Transaction descriptor
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db*: KvtDbRef ## Database descriptor
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parent*: KvtTxRef ## Previous transaction
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layer*: LayerRef
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KvtDbRef* = ref object of RootRef
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## Three tier database object supporting distributed instances.
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backend*: BackendRef ## Backend database (may well be `nil`)
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txRef*: KvtTxRef
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## Tx holding data scheduled to be written to disk during the next
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## `persist` call
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# Debugging data below, might go away in future
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xIdGen*: uint64
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xMap*: Table[seq[byte],uint64] ## For pretty printing
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pAmx*: Table[uint64,seq[byte]] ## For pretty printing
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KvtDbAction* = proc(db: KvtDbRef) {.gcsafe, raises: [].}
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## Generic call back function/closure.
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# ------------------------------------------------------------------------------
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# Public helpers
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# ------------------------------------------------------------------------------
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func getOrVoid*(tab: Table[seq[byte],seq[byte]]; w: seq[byte]): seq[byte] =
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tab.getOrDefault(w, EmptyBlob)
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func isValid*(key: seq[byte]): bool =
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key != EmptyBlob
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func isValid*(layer: LayerRef): bool =
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layer != LayerRef(nil)
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# ------------------------------------------------------------------------------
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# Public functions, miscellaneous
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# ------------------------------------------------------------------------------
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# Don't put in a hash!
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func hash*(db: KvtDbRef): Hash {.error.}
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iterator rstack*(tx: KvtTxRef): LayerRef =
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var tx = tx
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# Stack in reverse order
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while tx != nil:
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yield tx.layer
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tx = tx.parent
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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