128 lines
4.4 KiB
Nim
128 lines
4.4 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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## Aristo DB -- Patricia Trie backend data access
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## ==============================================
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##
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{.push raises: [].}
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import
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results,
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"."/[desc_error, desc_identifiers, desc_structural]
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type
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GetVtxFn* =
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proc(vid: VertexID): Result[VertexRef,AristoError] {.gcsafe, raises: [].}
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## Generic backend database retrieval function for a single structural
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## `Aristo DB` data record.
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GetKeyFn* =
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proc(vid: VertexID): Result[HashKey,AristoError] {.gcsafe, raises: [].}
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## Generic backend database retrieval function for a single
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## `Aristo DB` hash lookup value.
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GetTuvFn* =
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proc(): Result[VertexID,AristoError] {.gcsafe, raises: [].}
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## Generic backend database retrieval function for the top used
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## vertex ID.
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GetLstFn* =
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proc(): Result[SavedState,AristoError]
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{.gcsafe, raises: [].}
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## Generic last recorded state stamp retrieval function
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# -------------
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PutHdlRef* = ref object of RootRef
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## Persistent database transaction frame handle. This handle is used to
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## wrap any of `PutVtxFn`, `PutKeyFn`, and `PutIdgFn` into and atomic
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## transaction frame. These transaction frames must not be interleaved
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## by any library function using the backend.
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PutBegFn* =
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proc(): Result[PutHdlRef,AristoError] {.gcsafe, raises: [].}
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## Generic transaction initialisation function
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PutVtxFn* =
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proc(hdl: PutHdlRef; vid: VertexID; vtx: VertexRef)
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{.gcsafe, raises: [].}
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## Generic backend database bulk storage function, `VertexRef(nil)`
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## values indicate that records should be deleted.
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PutKeyFn* =
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proc(hdl: PutHdlRef; vid: VertexID, key: HashKey)
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{.gcsafe, raises: [].}
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## Generic backend database bulk storage function, `VOID_HASH_KEY`
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## values indicate that records should be deleted.
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PutTuvFn* =
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proc(hdl: PutHdlRef; vs: VertexID)
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{.gcsafe, raises: [].}
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## Generic backend database ID generator storage function for the
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## top used vertex ID.
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PutLstFn* =
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proc(hdl: PutHdlRef; lst: SavedState)
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{.gcsafe, raises: [].}
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## Generic last recorded state stamp storage function. This
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## function replaces the currentlt saved state.
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PutEndFn* =
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proc(hdl: PutHdlRef): Result[void,AristoError] {.gcsafe, raises: [].}
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## Generic transaction termination function
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# -------------
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CloseFn* =
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proc(eradicate: bool) {.gcsafe, raises: [].}
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## Generic destructor for the `Aristo DB` backend. The argument
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## `eradicate` indicates that a full database deletion is requested. If
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## passed `false` the outcome might differ depending on the type of
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## backend (e.g. in-memory backends will always eradicate on close.)
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# -------------
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BackendRef* = ref BackendObj
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BackendObj* = object of RootObj
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## Backend interface.
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getVtxFn*: GetVtxFn ## Read vertex record
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getKeyFn*: GetKeyFn ## Read Merkle hash/key
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getTuvFn*: GetTuvFn ## Read top used vertex ID
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getLstFn*: GetLstFn ## Read saved state
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putBegFn*: PutBegFn ## Start bulk store session
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putVtxFn*: PutVtxFn ## Bulk store vertex records
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putKeyFn*: PutKeyFn ## Bulk store vertex hashes
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putTuvFn*: PutTuvFn ## Store top used vertex ID
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putLstFn*: PutLstFn ## Store saved state
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putEndFn*: PutEndFn ## Commit bulk store session
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closeFn*: CloseFn ## Generic destructor
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proc init*(trg: var BackendObj; src: BackendObj) =
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trg.getVtxFn = src.getVtxFn
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trg.getKeyFn = src.getKeyFn
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trg.getTuvFn = src.getTuvFn
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trg.getLstFn = src.getLstFn
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trg.putBegFn = src.putBegFn
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trg.putVtxFn = src.putVtxFn
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trg.putKeyFn = src.putKeyFn
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trg.putTuvFn = src.putTuvFn
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trg.putLstFn = src.putLstFn
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trg.putEndFn = src.putEndFn
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trg.closeFn = src.closeFn
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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