71 lines
2.4 KiB
Nim
71 lines
2.4 KiB
Nim
# Nimbus
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# Copyright (c) 2018 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 except
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# according to those terms.
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{.push raises: [].}
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import
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eth/trie/db,
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../select_backend,
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"."/[base, legacy]
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export
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toLegacyTrieRef
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type
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LegaPersDbRef = ref object of LegacyDbRef
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backend: ChainDB # for backend access (legacy mode)
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# ------------------------------------------------------------------------------
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# Private helpers
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# ------------------------------------------------------------------------------
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template iflegaPersOk(db: CoreDbRef; body: untyped) =
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case db.dbType:
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of LegacyDbPersistent:
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body
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else:
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discard
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# ------------------------------------------------------------------------------
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# Public constructor and low level data retrieval, storage & transation frame
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# ------------------------------------------------------------------------------
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proc newLegacyPersistentCoreDbRef*(path: string): CoreDbRef =
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# Kludge: Compiler bails out on `results.tryGet()` with
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# ::
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# fatal.nim(54) sysFatal
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# Error: unhandled exception: types.nim(1251, 10) \
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# `b.kind in {tyObject} + skipPtrs` [AssertionDefect]
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#
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# when running `select_backend.newChainDB(path)`. The culprit seems to be
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# the `ResultError` exception (or any other `CatchableError`). So this is
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# converted to a `Defect`.
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var backend: ChainDB
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try:
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{.push warning[Deprecated]: off.}
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backend = newChainDB path
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{.pop.}
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except CatchableError as e:
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let msg = "DB initialisation error(" & $e.name & "): " & e.msg
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raise (ref ResultDefect)(msg: msg)
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LegaPersDbRef(backend: backend).init(LegacyDbPersistent, backend.trieDB)
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# ------------------------------------------------------------------------------
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# Public legacy helpers
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# ------------------------------------------------------------------------------
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proc toLegacyBackend*(db: CoreDbRef): ChainDB =
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db.ifLegaPersOk:
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return db.LegaPersDbRef.backend
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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