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https://github.com/status-im/nimbus-eth1.git
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71c91e2280
* Better error handling why: Bail out on some error as early as possible before any changes. * Implement `fetch()` as opposite of `merge()` rationale: In the `Aristo` realm, the action named `fetch()` and `merge()` indicate leaf value related actions on the MPT, while actions `get()` and `put()` handle vertex or hash key related operations that constitute the MPT. * Re-factor `merge()` prototypes why: The most used variant of `merge()` should have the simplest prototype. * Persistent DB constructor needs to import `aristo/aristo_init/persistent` why: Most applications use memory DB anyway. This avoids linking `-lrocksdb` or any other back end libraries by default. * Re-factor transaction module why: Got the paradigm wrong. The transaction descriptor did replace the database one but should be handled separately.
72 lines
2.3 KiB
Nim
72 lines
2.3 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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## Non persistent constructors for Aristo DB
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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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../aristo_desc,
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../aristo_desc/aristo_types_backend,
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"."/[aristo_init_common, aristo_memory]
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export
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AristoBackendType, TypedBackendRef
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# ------------------------------------------------------------------------------
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# Public database constuctors, destructor
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# ------------------------------------------------------------------------------
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proc newAristoDbRef*(
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backend: static[AristoBackendType];
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): AristoDbRef =
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## Simplified prototype for `BackendNone` and `BackendMemory` type backend.
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when backend == BackendNone:
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AristoDbRef(top: AristoLayerRef())
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elif backend == BackendMemory:
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AristoDbRef(top: AristoLayerRef(), backend: memoryBackend())
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elif backend == BackendRocksDB:
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{.error: "Aristo DB backend \"BackendRocksDB\" needs basePath argument".}
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else:
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{.error: "Unknown/unsupported Aristo DB backend".}
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# -----------------
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proc finish*(db: AristoDbRef; flush = false) =
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## Backend destructor. The argument `flush` indicates that a full database
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## deletion is requested. If set ot left `false` the outcome might differ
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## depending on the type of backend (e.g. the `BackendMemory` backend will
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## always flush on close.)
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##
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## This distructor may be used on already *destructed* descriptors.
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if not db.backend.isNil:
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db.backend.closeFn flush
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db.backend = AristoBackendRef(nil)
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db.top = AristoLayerRef(nil)
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db.stack.setLen(0)
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# -----------------
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proc to*[W: TypedBackendRef|MemBackendRef](
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db: AristoDbRef;
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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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