45 lines
1.6 KiB
Nim
45 lines
1.6 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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import
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std/tables,
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results,
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".."/[kvt_desc, kvt_utils]
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc filterReverse*(
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db: KvtDbRef; # Database
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filter: LayerDeltaRef; # Filter to revert
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): LayerDeltaRef =
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## Assemble reverse filter for the `filter` argument, i.e. changes to the
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## backend that reverse the effect of applying the this read-only filter.
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## The resulting filter is calculated against the current *unfiltered*
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## backend (excluding optionally installed read-only filter.)
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##
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## If `filter` is `nil`, the result will be `nil` as well.
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if not filter.isNil:
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result = LayerDeltaRef()
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# Calculate reverse changes for the `sTab[]` structural table
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for key in filter.sTab.keys:
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let rc = db.getUbe key
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if rc.isOk:
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result.sTab[key] = rc.value
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else:
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doAssert rc.error == GetNotFound
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result.sTab[key] = EmptyBlob
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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