64 lines
2.1 KiB
Nim
64 lines
2.1 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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## Persistent constructor for Kvt DB
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## ====================================
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##
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## This module automatically pulls in the persistent backend library at the
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## linking stage (e.g. `rocksdb`) which can be avoided for pure memory DB
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## applications by importing `./kvt_init/memory_only` (rather than
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## `./kvt_init/persistent`.)
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##
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{.push raises: [].}
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import
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results,
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../kvt_desc,
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"."/[rocks_db, memory_only]
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from ../../aristo/aristo_persistent
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import GuestDbRef, getRocksDbFamily
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export
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RdbBackendRef,
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memory_only
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# ------------------------------------------------------------------------------
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# Public database constuctors, destructor
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# ------------------------------------------------------------------------------
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proc init*[W: MemOnlyBackend|RdbBackendRef](
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T: type KvtDbRef;
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B: type W;
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basePath: string;
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guestDb = GuestDbRef(nil);
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): Result[KvtDbRef,KvtError] =
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## Generic constructor, `basePath` argument is ignored for `BackendNone` and
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## `BackendMemory` type backend database. Also, both of these backends
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## aways succeed initialising.
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##
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## If the argument `guestDb` is set and is a RocksDB column familly, the
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## `Kvt`batabase is built upon this column familly. Othewise it is newly
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## created with `basePath` as storage location.
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##
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when B is RdbBackendRef:
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let rc = guestDb.getRocksDbFamily()
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if rc.isOk:
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ok KvtDbRef(top: LayerRef.init(), backend: ? rocksDbBackend rc.value)
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else:
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ok KvtDbRef(top: LayerRef.init(), backend: ? rocksDbBackend basePath)
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else:
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ok KvtDbRef.init B
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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