65 lines
2.1 KiB
Nim
65 lines
2.1 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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## 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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"."/[init_common, 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 newKvtDbRef*(
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backend: static[BackendType];
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basePath: string;
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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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when backend == BackendRocksDB:
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ok KvtDbRef(top: LayerRef(vGen: vGen), backend: ? rocksDbBackend basePath)
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elif backend == BackendVoid:
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{.error: "Use BackendNone.init() without path argument".}
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elif backend == BackendMemory:
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{.error: "Use BackendMemory.init() without path argument".}
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else:
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{.error: "Unknown/unsupported Kvt DB backend".}
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# -----------------
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proc to*[W: RdbBackendRef](
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db: KvtDbRef;
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T: type W;
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): T =
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## Handy helper for lew-level access to some backend functionality
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db.backend.T
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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