105 lines
3.0 KiB
Nim
105 lines
3.0 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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eth/common,
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results,
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".."/[aristo_desc, aristo_get, aristo_utils]
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# ------------------------------------------------------------------------------
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# Private functions
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# ------------------------------------------------------------------------------
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proc revSubTree(
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db: AristoDbRef;
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rev: LayerRef;
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rvid: RootedVertexID;
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): Result[void,(VertexID,AristoError)] =
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## Collect subtrees marked for deletion
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let
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vtx = block:
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let rc = db.getVtxUbe rvid
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if rc.isOk:
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rc.value
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elif rc.error == GetVtxNotFound:
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VertexRef(nil)
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else:
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return err((rvid.vid,rc.error))
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key = block:
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let rc = db.getKeyUbe rvid
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if rc.isOk:
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rc.value
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elif rc.error == GetKeyNotFound:
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VOID_HASH_KEY
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else:
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return err((rvid.vid,rc.error))
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if vtx.isValid:
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for vid in vtx.subVids:
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? db.revSubTree(rev, (rvid.root,vid))
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rev.sTab[rvid] = vtx
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if key.isValid:
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rev.kMap[rvid] = key
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ok()
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc revFilter*(
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db: AristoDbRef; # Database
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filter: LayerRef; # Filter to revert
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): Result[LayerRef,(VertexID,AristoError)] =
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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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##
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## This read-only 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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let rev = LayerRef()
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# Get vid generator state on backend
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block:
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let rc = db.getTuvUbe()
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if rc.isOk:
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rev.vTop = rc.value
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elif rc.error != GetTuvNotFound:
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return err((VertexID(0), rc.error))
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# Calculate reverse changes for the `sTab[]` structural table
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for rvid in filter.sTab.keys:
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let rc = db.getVtxUbe rvid
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if rc.isOk:
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rev.sTab[rvid] = rc.value
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elif rc.error == GetVtxNotFound:
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rev.sTab[rvid] = VertexRef(nil)
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else:
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return err((rvid.vid,rc.error))
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# Calculate reverse changes for the `kMap[]` structural table.
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for rvid in filter.kMap.keys:
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let rc = db.getKeyUbe rvid
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if rc.isOk:
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rev.kMap[rvid] = rc.value
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elif rc.error == GetKeyNotFound:
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rev.kMap[rvid] = VOID_HASH_KEY
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else:
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return err((rvid.vid,rc.error))
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ok(rev)
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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