72 lines
2.3 KiB
Nim
72 lines
2.3 KiB
Nim
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# 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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## Kvt DB -- backend 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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eth/common,
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results,
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./desc_error
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type
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GetKvpFn* =
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proc(key: Blob): Result[Blob,KvtError] {.gcsafe, raises: [].}
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## Generic backend database 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(): PutHdlRef {.gcsafe, raises: [].}
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## Generic transaction initialisation function
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PutKvpFn* =
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proc(hdl: PutHdlRef; kvps: openArray[(Blob,Blob)]) {.gcsafe, raises: [].}
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## Generic backend database bulk storage function.
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PutEndFn* =
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proc(hdl: PutHdlRef): Result[void,KvtError] {.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 `Kvt 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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getKvpFn*: GetKvpFn ## Read key-value pair
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putBegFn*: PutBegFn ## Start bulk store session
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putKvpFn*: PutKvpFn ## Bulk store key-value pairs
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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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