63 lines
2.2 KiB
Nim
63 lines
2.2 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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## Persistent constructor for Aristo 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 `./aristo_init/memory_only` (rather than
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## `./aristo_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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../aristo_desc,
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"."/[rocks_db, memory_only]
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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 AristoDbRef;
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B: type W;
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basePath: string;
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qidLayout = DefaultQidLayoutRef;
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): Result[T, AristoError] =
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## Generic constructor, `basePath` argument is ignored for memory backend
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## databases (which also unconditionally succeed initialising.)
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##
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## If the `qidLayout` argument is set `QidLayoutRef(nil)`, the a backend
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## database will not provide filter history management. Providing a different
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## scheduler layout shoud be used with care as table access with different
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## layouts might render the filter history data unmanageable.
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##
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when B is RdbBackendRef:
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let
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be = ? rocksDbBackend(basePath, qidLayout)
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vGen = block:
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let rc = be.getIdgFn()
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if rc.isErr:
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be.closeFn(flush = false)
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return err(rc.error)
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rc.value
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ok AristoDbRef(top: LayerRef(vGen: vGen), backend: be)
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else:
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ok AristoDbRef.init(B, qidLayout)
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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