92 lines
3.1 KiB
Nim
92 lines
3.1 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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## Kvt DB -- Filter management
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## ===========================
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##
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import
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std/[sequtils, tables],
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results,
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./kvt_desc,
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./kvt_desc/desc_backend,
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./kvt_delta/[delta_merge, delta_reverse]
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc deltaPersistentOk*(db: KvtDbRef): bool =
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## Check whether the balancer filter can be merged into the backend
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not db.backend.isNil and db.isCentre
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proc deltaPersistent*(
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db: KvtDbRef; # Database
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reCentreOk = false;
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): Result[void,KvtError] =
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## Resolve (i.e. move) the backend filter into the physical backend database.
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##
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## This needs write permission on the backend DB for the argument `db`
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## descriptor (see the function `aristo_desc.isCentre()`.) With the argument
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## flag `reCentreOk` passed `true`, write permission will be temporarily
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## acquired when needed.
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##
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## Other non-centre descriptors are updated so there is no visible database
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## change for these descriptors.
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##
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let be = db.backend
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if be.isNil:
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return err(FilBackendMissing)
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# Blind or missing filter
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if db.balancer.isNil:
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return ok()
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# Make sure that the argument `db` is at the centre so the backend is in
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# read-write mode for this peer.
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let parent = db.getCentre
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if db != parent:
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if not reCentreOk:
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return err(FilBackendRoMode)
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? db.reCentre()
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# Always re-centre to `parent` (in case `reCentreOk` was set)
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defer: discard parent.reCentre()
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# Update forked balancers here do that errors are detected early (if any.)
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if 0 < db.nForked:
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let rev = db.revFilter(db.balancer).valueOr:
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return err(error[1])
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if 0 < rev.sTab.len: # Can an empty `rev` happen at all?
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var unsharedRevOk = true
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for w in db.forked:
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if not w.db.balancer.isValid:
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unsharedRevOk = false
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# The `rev` filter can be modified if one can make sure that it is
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# not shared (i.e. only previously merged into the w.db.balancer.)
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# Note that it is trivially true for a single fork.
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let modLowerOk = w.isLast and unsharedRevOk
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w.db.balancer = deltaMerge(
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w.db.balancer, modUpperOk=false, rev, modLowerOk=modLowerOk)
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# Store structural single trie entries
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let writeBatch = ? be.putBegFn()
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be.putKvpFn(writeBatch, db.balancer.sTab.pairs.toSeq)
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? be.putEndFn writeBatch
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# Done with balancer, all saved to backend
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db.balancer = LayerRef(nil)
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ok()
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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