126 lines
4.7 KiB
Nim
126 lines
4.7 KiB
Nim
# nimbus-eth1
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# Copyright (c) 2021 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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GetFilFn* =
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proc(qid: QueueID): Result[FilterRef,AristoError]
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{.gcsafe, raises: [].}
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## Generic backend database retrieval function for a filter record.
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GetIdgFn* =
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proc(): Result[seq[VertexID],AristoError] {.gcsafe, raises: [].}
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## Generic backend database retrieval function for a the ID generator
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## `Aristo DB` state record.
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GetFqsFn* =
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proc(): Result[seq[(QueueID,QueueID)],AristoError] {.gcsafe, raises: [].}
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## Generic backend database retrieval function for some filter queue
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## administration data (e.g. the bottom/top ID.)
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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(): PutHdlRef {.gcsafe, raises: [].}
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## Generic transaction initialisation function
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PutVtxFn* =
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proc(hdl: PutHdlRef; vrps: openArray[(VertexID,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; vkps: openArray[(VertexID,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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PutFilFn* =
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proc(hdl: PutHdlRef; qf: openArray[(QueueID,FilterRef)])
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{.gcsafe, raises: [].}
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## Generic backend database storage function for filter records.
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PutIdgFn* =
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proc(hdl: PutHdlRef; vs: openArray[VertexID])
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{.gcsafe, raises: [].}
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## Generic backend database ID generator state storage function. This
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## function replaces the current generator state.
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PutFqsFn* =
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proc(hdl: PutHdlRef; vs: openArray[(QueueID,QueueID)])
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{.gcsafe, raises: [].}
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## Generic backend database filter ID state storage function. This
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## function replaces the current filter ID list.
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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(flush: bool) {.gcsafe, raises: [].}
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## Generic destructor for the `Aristo DB` backend. The argument `flush`
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## indicates that a full database deletion is requested. If passed
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## `false` the outcome might differ depending on the type of backend
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## (e.g. in-memory backends would flush on close.)
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# -------------
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BackendRef* = ref object of RootRef
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## Backend interface.
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filters*: QidSchedRef ## Filter slot queue state
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getVtxFn*: GetVtxFn ## Read vertex record
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getKeyFn*: GetKeyFn ## Read Merkle hash/key
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getFilFn*: GetFilFn ## Read back log filter
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getIdgFn*: GetIdgFn ## Read vertex ID generator state
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getFqsFn*: GetFqsFn ## Read filter ID 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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putFilFn*: PutFilFn ## Store back log filter
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putIdgFn*: PutIdgFn ## Store ID generator state
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putFqsFn*: PutFqsFn ## Store filter ID state
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putEndFn*: PutEndFn ## Commit bulk store session
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closeFn*: CloseFn ## Generic destructor
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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