834 lines
28 KiB
Nim
834 lines
28 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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## Aristo DB -- Patricia Trie builder, raw node insertion
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## ======================================================
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##
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## This module merges `PathID` values as hexary lookup paths into the
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## `Patricia Trie`. When changing vertices (aka nodes without Merkle hashes),
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## associated (but separated) Merkle hashes will be deleted unless locked.
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## Instead of deleting locked hashes error handling is applied.
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##
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## Also, nodes (vertices plus merkle hashes) can be added which is needed for
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## boundary proofing after `snap/1` download. The vertices are split from the
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## nodes and stored as-is on the table holding `Patricia Trie` entries. The
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## hashes are stored iin a separate table and the vertices are labelled
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## `locked`.
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{.push raises: [].}
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import
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std/[algorithm, sequtils, strutils, sets, tables, typetraits],
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chronicles,
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eth/[common, trie/nibbles],
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results,
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stew/keyed_queue,
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../../sync/protocol/snap/snap_types,
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"."/[aristo_desc, aristo_get, aristo_hike, aristo_layers,
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aristo_path, aristo_serialise, aristo_utils, aristo_vid]
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logScope:
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topics = "aristo-merge"
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type
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LeafTiePayload* = object
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## Generalised key-value pair for a sub-trie. The main trie is the
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## sub-trie with `root=VertexID(1)`.
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leafTie*: LeafTie ## Full `Patricia Trie` path root-to-leaf
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payload*: PayloadRef ## Leaf data payload
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# ------------------------------------------------------------------------------
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# Private getters & setters
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# ------------------------------------------------------------------------------
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proc xPfx(vtx: VertexRef): NibblesSeq =
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case vtx.vType:
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of Leaf:
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return vtx.lPfx
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of Extension:
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return vtx.ePfx
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of Branch:
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doAssert vtx.vType != Branch # Ooops
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# ------------------------------------------------------------------------------
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# Private helpers
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# ------------------------------------------------------------------------------
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proc to(
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rc: Result[Hike,AristoError];
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T: type Result[bool,AristoError];
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): T =
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## Return code converter
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if rc.isOk:
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ok true
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elif rc.error in {MergeLeafPathCachedAlready,
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MergeLeafPathOnBackendAlready}:
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ok false
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else:
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err(rc.error)
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# -----------
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proc clearMerkleKeys(
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db: AristoDbRef; # Database, top layer
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hike: Hike; # Implied vertex IDs to clear hashes for
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vid: VertexID; # Additionall vertex IDs to clear
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) =
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for w in hike.legs.mapIt(it.wp.vid) & @[vid]:
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db.layersResKey(hike.root, w)
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proc setVtxAndKey(
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db: AristoDbRef; # Database, top layer
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root: VertexID;
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vid: VertexID; # Vertex IDs to add/clear
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vtx: VertexRef; # Vertex to add
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) =
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db.layersPutVtx(root, vid, vtx)
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db.layersResKey(root, vid)
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# -----------
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proc insertBranch(
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db: AristoDbRef; # Database, top layer
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hike: Hike; # Current state
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linkID: VertexID; # Vertex ID to insert
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linkVtx: VertexRef; # Vertex to insert
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payload: PayloadRef; # Leaf data payload
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): Result[Hike,AristoError] =
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##
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## Insert `Extension->Branch` vertex chain or just a `Branch` vertex
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##
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## ... --(linkID)--> <linkVtx>
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##
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## <-- immutable --> <---- mutable ----> ..
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##
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## will become either
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##
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## --(linkID)-->
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## <extVtx> --(local1)-->
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## <forkVtx>[linkInx] --(local2)--> <linkVtx*>
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## [leafInx] --(local3)--> <leafVtx>
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##
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## or in case that there is no common prefix
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##
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## --(linkID)-->
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## <forkVtx>[linkInx] --(local2)--> <linkVtx*>
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## [leafInx] --(local3)--> <leafVtx>
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##
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## *) vertex was slightly modified or removed if obsolete `Extension`
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##
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let n = linkVtx.xPfx.sharedPrefixLen hike.tail
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# Verify minimum requirements
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if hike.tail.len == n:
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# Should have been tackeld by `hikeUp()`, already
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return err(MergeLeafGarbledHike)
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if linkVtx.xPfx.len == n:
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return err(MergeBranchLinkVtxPfxTooShort)
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# Provide and install `forkVtx`
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let
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forkVtx = VertexRef(vType: Branch)
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linkInx = linkVtx.xPfx[n]
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leafInx = hike.tail[n]
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var
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leafLeg = Leg(nibble: -1)
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# Install `forkVtx`
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block:
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# Clear Merkle hashes (aka hash keys) unless proof mode.
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if db.pPrf.len == 0:
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db.clearMerkleKeys(hike, linkID)
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elif linkID in db.pPrf:
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return err(MergeNonBranchProofModeLock)
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if linkVtx.vType == Leaf:
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# Update vertex path lookup
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let
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path = hike.legsTo(NibblesSeq) & linkVtx.lPfx
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rc = path.pathToTag()
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if rc.isErr:
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debug "Branch link leaf path garbled", linkID, path
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return err(MergeBranchLinkLeafGarbled)
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let local = db.vidFetch(pristine = true)
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db.setVtxAndKey(hike.root, local, linkVtx)
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linkVtx.lPfx = linkVtx.lPfx.slice(1+n)
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forkVtx.bVid[linkInx] = local
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elif linkVtx.ePfx.len == n + 1:
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# This extension `linkVtx` becomes obsolete
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forkVtx.bVid[linkInx] = linkVtx.eVid
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else:
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let local = db.vidFetch
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db.setVtxAndKey(hike.root, local, linkVtx)
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linkVtx.ePfx = linkVtx.ePfx.slice(1+n)
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forkVtx.bVid[linkInx] = local
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block:
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let local = db.vidFetch(pristine = true)
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forkVtx.bVid[leafInx] = local
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leafLeg.wp.vid = local
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leafLeg.wp.vtx = VertexRef(
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vType: Leaf,
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lPfx: hike.tail.slice(1+n),
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lData: payload)
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db.setVtxAndKey(hike.root, local, leafLeg.wp.vtx)
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# Update branch leg, ready to append more legs
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var okHike = Hike(root: hike.root, legs: hike.legs)
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# Update in-beween glue linking `branch --[..]--> forkVtx`
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if 0 < n:
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let extVtx = VertexRef(
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vType: Extension,
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ePfx: hike.tail.slice(0,n),
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eVid: db.vidFetch)
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db.setVtxAndKey(hike.root, linkID, extVtx)
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okHike.legs.add Leg(
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nibble: -1,
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wp: VidVtxPair(
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vid: linkID,
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vtx: extVtx))
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db.setVtxAndKey(hike.root, extVtx.eVid, forkVtx)
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okHike.legs.add Leg(
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nibble: leafInx.int8,
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wp: VidVtxPair(
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vid: extVtx.eVid,
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vtx: forkVtx))
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else:
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db.setVtxAndKey(hike.root, linkID, forkVtx)
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okHike.legs.add Leg(
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nibble: leafInx.int8,
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wp: VidVtxPair(
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vid: linkID,
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vtx: forkVtx))
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okHike.legs.add leafLeg
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ok okHike
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proc concatBranchAndLeaf(
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db: AristoDbRef; # Database, top layer
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hike: Hike; # Path top has a `Branch` vertex
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brVid: VertexID; # Branch vertex ID from from `Hike` top
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brVtx: VertexRef; # Branch vertex, linked to from `Hike`
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payload: PayloadRef; # Leaf data payload
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): Result[Hike,AristoError] =
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## Append argument branch vertex passed as argument `(brID,brVtx)` and then
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## a `Leaf` vertex derived from the argument `payload`.
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##
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if hike.tail.len == 0:
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return err(MergeBranchGarbledTail)
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let nibble = hike.tail[0].int8
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if brVtx.bVid[nibble].isValid:
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return err(MergeRootBranchLinkBusy)
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# Clear Merkle hashes (aka hash keys) unless proof mode.
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if db.pPrf.len == 0:
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db.clearMerkleKeys(hike, brVid)
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elif brVid in db.pPrf:
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return err(MergeBranchProofModeLock) # Ooops
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# Append branch vertex
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var okHike = Hike(root: hike.root, legs: hike.legs)
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okHike.legs.add Leg(wp: VidVtxPair(vtx: brVtx, vid: brVid), nibble: nibble)
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# Append leaf vertex
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let
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vid = db.vidFetch(pristine = true)
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vtx = VertexRef(
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vType: Leaf,
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lPfx: hike.tail.slice(1),
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lData: payload)
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brVtx.bVid[nibble] = vid
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db.setVtxAndKey(hike.root, brVid, brVtx)
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db.setVtxAndKey(hike.root, vid, vtx)
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okHike.legs.add Leg(wp: VidVtxPair(vtx: vtx, vid: vid), nibble: -1)
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ok okHike
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# ------------------------------------------------------------------------------
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# Private functions: add Particia Trie leaf vertex
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# ------------------------------------------------------------------------------
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proc topIsBranchAddLeaf(
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db: AristoDbRef; # Database, top layer
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hike: Hike; # Path top has a `Branch` vertex
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payload: PayloadRef; # Leaf data payload
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): Result[Hike,AristoError] =
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## Append a `Leaf` vertex derived from the argument `payload` after the top
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## leg of the `hike` argument which is assumend to refert to a `Branch`
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## vertex. If successful, the function returns the updated `hike` trail.
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if hike.tail.len == 0:
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return err(MergeBranchGarbledTail)
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let nibble = hike.legs[^1].nibble
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if nibble < 0:
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return err(MergeBranchGarbledNibble)
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let
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parent = hike.legs[^1].wp.vid
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branch = hike.legs[^1].wp.vtx
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linkID = branch.bVid[nibble]
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linkVtx = db.getVtx linkID
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if not linkVtx.isValid:
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#
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# .. <branch>[nibble] --(linkID)--> nil
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#
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# <-------- immutable ------------> <---- mutable ----> ..
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#
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if db.pPrf.len == 0:
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# Not much else that can be done here
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debug "Dangling leaf link, reused", branch=hike.legs[^1].wp.vid,
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nibble, linkID, leafPfx=hike.tail
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# Reuse placeholder entry in table
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let vtx = VertexRef(
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vType: Leaf,
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lPfx: hike.tail,
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lData: payload)
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db.setVtxAndKey(hike.root, linkID, vtx)
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var okHike = Hike(root: hike.root, legs: hike.legs)
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okHike.legs.add Leg(wp: VidVtxPair(vid: linkID, vtx: vtx), nibble: -1)
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if parent notin db.pPrf:
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db.layersResKey(hike.root, parent)
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return ok(okHike)
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if linkVtx.vType == Branch:
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# Slot link to a branch vertex should be handled by `hikeUp()`
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#
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# .. <branch>[nibble] --(linkID)--> <linkVtx>[]
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#
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# <-------- immutable ------------> <---- mutable ----> ..
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#
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return db.concatBranchAndLeaf(hike, linkID, linkVtx, payload)
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db.insertBranch(hike, linkID, linkVtx, payload)
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proc topIsExtAddLeaf(
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db: AristoDbRef; # Database, top layer
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hike: Hike; # Path top has an `Extension` vertex
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payload: PayloadRef; # Leaf data payload
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): Result[Hike,AristoError] =
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## Append a `Leaf` vertex derived from the argument `payload` after the top
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## leg of the `hike` argument which is assumend to refert to a `Extension`
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## vertex. If successful, the function returns the
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## updated `hike` trail.
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let
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extVtx = hike.legs[^1].wp.vtx
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extVid = hike.legs[^1].wp.vid
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brVid = extVtx.eVid
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brVtx = db.getVtx brVid
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var okHike = Hike(root: hike.root, legs: hike.legs)
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if not brVtx.isValid:
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# Blind vertex, promote to leaf vertex.
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#
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# --(extVid)--> <extVtx> --(brVid)--> nil
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#
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# <-------- immutable -------------->
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#
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let vtx = VertexRef(
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vType: Leaf,
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lPfx: extVtx.ePfx & hike.tail,
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lData: payload)
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db.setVtxAndKey(hike.root, extVid, vtx)
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okHike.legs[^1].wp.vtx = vtx
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elif brVtx.vType != Branch:
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return err(MergeBranchRootExpected)
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else:
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let
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nibble = hike.tail[0].int8
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linkID = brVtx.bVid[nibble]
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#
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# Required
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#
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# --(extVid)--> <extVtx> --(brVid)--> <brVtx>[nibble] --(linkID)--> nil
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#
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# <-------- immutable --------------> <-------- mutable ----------> ..
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#
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if linkID.isValid:
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return err(MergeRootBranchLinkBusy)
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# Clear Merkle hashes (aka hash keys) unless proof mode
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if db.pPrf.len == 0:
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db.clearMerkleKeys(hike, brVid)
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elif brVid in db.pPrf:
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return err(MergeBranchProofModeLock)
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let
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vid = db.vidFetch(pristine = true)
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vtx = VertexRef(
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vType: Leaf,
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lPfx: hike.tail.slice(1),
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lData: payload)
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brVtx.bVid[nibble] = vid
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db.setVtxAndKey(hike.root, brVid, brVtx)
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db.setVtxAndKey(hike.root, vid, vtx)
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okHike.legs.add Leg(wp: VidVtxPair(vtx: brVtx, vid: brVid), nibble: nibble)
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okHike.legs.add Leg(wp: VidVtxPair(vtx: vtx, vid: vid), nibble: -1)
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ok okHike
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proc topIsEmptyAddLeaf(
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db: AristoDbRef; # Database, top layer
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hike: Hike; # No path legs
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rootVtx: VertexRef; # Root vertex
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payload: PayloadRef; # Leaf data payload
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): Result[Hike,AristoError] =
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## Append a `Leaf` vertex derived from the argument `payload` after the
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## argument vertex `rootVtx` and append both the empty arguent `hike`.
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if rootVtx.vType == Branch:
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let nibble = hike.tail[0].int8
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if rootVtx.bVid[nibble].isValid:
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return err(MergeRootBranchLinkBusy)
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# Clear Merkle hashes (aka hash keys) unless proof mode
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if db.pPrf.len == 0:
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db.clearMerkleKeys(hike, hike.root)
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elif hike.root in db.pPrf:
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return err(MergeBranchProofModeLock)
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let
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leafVid = db.vidFetch(pristine = true)
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leafVtx = VertexRef(
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vType: Leaf,
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lPfx: hike.tail.slice(1),
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lData: payload)
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rootVtx.bVid[nibble] = leafVid
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db.setVtxAndKey(hike.root, hike.root, rootVtx)
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db.setVtxAndKey(hike.root, leafVid, leafVtx)
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return ok Hike(
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root: hike.root,
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legs: @[Leg(wp: VidVtxPair(vtx: rootVtx, vid: hike.root), nibble: nibble),
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Leg(wp: VidVtxPair(vtx: leafVtx, vid: leafVid), nibble: -1)])
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db.insertBranch(hike, hike.root, rootVtx, payload)
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proc updatePayload(
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db: AristoDbRef; # Database, top layer
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hike: Hike; # No path legs
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leafTie: LeafTie; # Leaf item to add to the database
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payload: PayloadRef; # Payload value
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): Result[Hike,AristoError] =
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## Update leaf vertex if payloads differ
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let leafLeg = hike.legs[^1]
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# Update payloads if they differ
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if leafLeg.wp.vtx.lData != payload:
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# Update vertex and hike
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let
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vid = leafLeg.wp.vid
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vtx = VertexRef(
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vType: Leaf,
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lPfx: leafLeg.wp.vtx.lPfx,
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lData: payload)
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var hike = hike
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hike.legs[^1].wp.vtx = vtx
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# Modify top level cache
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db.setVtxAndKey(hike.root, vid, vtx)
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db.clearMerkleKeys(hike, vid)
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ok hike
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elif db.layersGetVtx(leafLeg.wp.vid).isErr:
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err(MergeLeafPathOnBackendAlready)
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else:
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err(MergeLeafPathCachedAlready)
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# ------------------------------------------------------------------------------
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# Private functions: add Merkle proof node
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# ------------------------------------------------------------------------------
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proc mergeNodeImpl(
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db: AristoDbRef; # Database, top layer
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hashKey: HashKey; # Merkel hash of node (or so)
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node: NodeRef; # Node derived from RLP representation
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rootVid: VertexID; # Current sub-trie
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): Result[void,AristoError] =
|
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## The function merges the argument hash key `lid` as expanded from the
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## node RLP representation into the `Aristo Trie` database. The vertex is
|
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## split off from the node and stored separately. So are the Merkle hashes.
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## The vertex is labelled `locked`.
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##
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## The `node` argument is *not* checked, whether the vertex IDs have been
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## allocated, already. If the node comes straight from the `decode()` RLP
|
|
## decoder as expected, these vertex IDs will be all zero.
|
|
##
|
|
## This function expects that the parent for the argument `node` has already
|
|
## been installed.
|
|
##
|
|
## Caveat:
|
|
## Proof of concept, not in production yet.
|
|
##
|
|
# Check for error after RLP decoding
|
|
doAssert node.error == AristoError(0)
|
|
|
|
# Verify arguments
|
|
if not rootVid.isValid:
|
|
return err(MergeRootKeyInvalid)
|
|
if not hashKey.isValid:
|
|
return err(MergeHashKeyInvalid)
|
|
|
|
# Make sure that the `vid<->key` reverse mapping is updated.
|
|
let vid = db.layerGetProofVidOrVoid hashKey
|
|
if not vid.isValid:
|
|
return err(MergeRevVidMustHaveBeenCached)
|
|
|
|
# Use the vertex ID `vid` to be populated by the argument root node
|
|
let key = db.layersGetKeyOrVoid vid
|
|
if key.isValid and key != hashKey:
|
|
return err(MergeHashKeyDiffersFromCached)
|
|
|
|
# Set up vertex.
|
|
let (vtx, newVtxFromNode) = block:
|
|
let vty = db.getVtx vid
|
|
if vty.isValid:
|
|
(vty, false)
|
|
else:
|
|
(node.to(VertexRef), true)
|
|
|
|
# The `vertexID <-> hashKey` mappings need to be set up now (if any)
|
|
case node.vType:
|
|
of Leaf:
|
|
discard
|
|
of Extension:
|
|
if node.key[0].isValid:
|
|
let eKey = node.key[0]
|
|
if newVtxFromNode:
|
|
# Brand new reverse lookup link for this vertex
|
|
vtx.eVid = db.vidFetch
|
|
db.layersPutProof(vtx.eVid, eKey)
|
|
elif not vtx.eVid.isValid:
|
|
return err(MergeNodeVtxDiffersFromExisting)
|
|
db.layersPutProof(vtx.eVid, eKey)
|
|
of Branch:
|
|
for n in 0..15:
|
|
if node.key[n].isValid:
|
|
let bKey = node.key[n]
|
|
if newVtxFromNode:
|
|
# Brand new reverse lookup link for this vertex
|
|
vtx.bVid[n] = db.vidFetch
|
|
db.layersPutProof(vtx.bVid[n], bKey)
|
|
elif not vtx.bVid[n].isValid:
|
|
return err(MergeNodeVtxDiffersFromExisting)
|
|
db.layersPutProof(vtx.bVid[n], bKey)
|
|
|
|
# Store and lock vertex
|
|
db.layersPutProof(vid, key, vtx)
|
|
ok()
|
|
|
|
# ------------------------------------------------------------------------------
|
|
# Public functions
|
|
# ------------------------------------------------------------------------------
|
|
|
|
proc mergePayload*(
|
|
db: AristoDbRef; # Database, top layer
|
|
leafTie: LeafTie; # Leaf item to add to the database
|
|
payload: PayloadRef; # Payload value
|
|
accPath: PathID; # Needed for accounts payload
|
|
): Result[Hike,AristoError] =
|
|
## Merge the argument `leafTie` key-value-pair into the top level vertex
|
|
## table of the database `db`. The field `path` of the `leafTie` argument is
|
|
## used to index the leaf vertex on the `Patricia Trie`. The field `payload`
|
|
## is stored with the leaf vertex in the database unless the leaf vertex
|
|
## exists already.
|
|
##
|
|
## For a `payload.root` with `VertexID` greater than `LEAST_FREE_VID`, the
|
|
## sub-tree generated by `payload.root` is considered a storage trie linked
|
|
## to an account leaf referred to by a valid `accPath` (i.e. different from
|
|
## `VOID_PATH_ID`.) In that case, an account must exists. If there is payload
|
|
## of type `AccountData`, its `storageID` field must be unset or equal to the
|
|
## `payload.root` vertex ID.
|
|
##
|
|
if LEAST_FREE_VID <= leafTie.root.distinctBase:
|
|
? db.registerAccount(leafTie.root, accPath)
|
|
elif not leafTie.root.isValid:
|
|
return err(MergeRootMissing)
|
|
|
|
let hike = leafTie.hikeUp(db).to(Hike)
|
|
var okHike: Hike
|
|
if 0 < hike.legs.len:
|
|
case hike.legs[^1].wp.vtx.vType:
|
|
of Branch:
|
|
okHike = ? db.topIsBranchAddLeaf(hike, payload)
|
|
of Leaf:
|
|
if 0 < hike.tail.len: # `Leaf` vertex problem?
|
|
return err(MergeLeafGarbledHike)
|
|
okHike = ? db.updatePayload(hike, leafTie, payload)
|
|
of Extension:
|
|
okHike = ? db.topIsExtAddLeaf(hike, payload)
|
|
|
|
else:
|
|
# Empty hike
|
|
let rootVtx = db.getVtx hike.root
|
|
if rootVtx.isValid:
|
|
okHike = ? db.topIsEmptyAddLeaf(hike,rootVtx, payload)
|
|
|
|
else:
|
|
# Bootstrap for existing root ID
|
|
let wp = VidVtxPair(
|
|
vid: hike.root,
|
|
vtx: VertexRef(
|
|
vType: Leaf,
|
|
lPfx: leafTie.path.to(NibblesSeq),
|
|
lData: payload))
|
|
db.setVtxAndKey(hike.root, wp.vid, wp.vtx)
|
|
okHike = Hike(root: wp.vid, legs: @[Leg(wp: wp, nibble: -1)])
|
|
|
|
# Double check the result until the code is more reliable
|
|
block:
|
|
let rc = okHike.to(NibblesSeq).pathToTag
|
|
if rc.isErr or rc.value != leafTie.path:
|
|
return err(MergeAssemblyFailed) # Ooops
|
|
|
|
ok okHike
|
|
|
|
|
|
proc mergePayload*(
|
|
db: AristoDbRef; # Database, top layer
|
|
root: VertexID; # MPT state root
|
|
path: openArray[byte]; # Even nibbled byte path
|
|
payload: PayloadRef; # Payload value
|
|
accPath = VOID_PATH_ID; # Needed for accounts payload
|
|
): Result[bool,AristoError] =
|
|
## Variant of `merge()` for `(root,path)` arguments instead of a `LeafTie`
|
|
## object.
|
|
let lty = LeafTie(root: root, path: ? path.pathToTag)
|
|
db.mergePayload(lty, payload, accPath).to(typeof result)
|
|
|
|
|
|
proc merge*(
|
|
db: AristoDbRef; # Database, top layer
|
|
root: VertexID; # MPT state root
|
|
path: openArray[byte]; # Leaf item to add to the database
|
|
data: openArray[byte]; # Raw data payload value
|
|
accPath: PathID; # Needed for accounts payload
|
|
): Result[bool,AristoError] =
|
|
## Variant of `merge()` for `(root,path)` arguments instead of a `LeafTie`.
|
|
## The argument `data` is stored as-is as a `RawData` payload value.
|
|
let pyl = PayloadRef(pType: RawData, rawBlob: @data)
|
|
db.mergePayload(root, path, pyl, accPath)
|
|
|
|
proc mergeAccount*(
|
|
db: AristoDbRef; # Database, top layer
|
|
path: openArray[byte]; # Leaf item to add to the database
|
|
data: openArray[byte]; # Raw data payload value
|
|
): Result[bool,AristoError] =
|
|
## Variant of `merge()` for `(VertexID(1),path)` arguments instead of a
|
|
## `LeafTie`. The argument `data` is stored as-is as a `RawData` payload
|
|
## value.
|
|
let pyl = PayloadRef(pType: RawData, rawBlob: @data)
|
|
db.mergePayload(VertexID(1), path, pyl, VOID_PATH_ID)
|
|
|
|
|
|
proc mergeLeaf*(
|
|
db: AristoDbRef; # Database, top layer
|
|
leaf: LeafTiePayload; # Leaf item to add to the database
|
|
accPath = VOID_PATH_ID; # Needed for accounts payload
|
|
): Result[bool,AristoError] =
|
|
## Variant of `merge()`. This function will not indicate if the leaf
|
|
## was cached, already.
|
|
db.mergePayload(leaf.leafTie, leaf.payload, accPath).to(typeof result)
|
|
|
|
# ---------------------
|
|
|
|
proc merge*(
|
|
db: AristoDbRef; # Database, top layer
|
|
proof: openArray[SnapProof]; # RLP encoded node records
|
|
rootVid: VertexID; # Current sub-trie
|
|
): Result[int, AristoError]
|
|
{.gcsafe, raises: [RlpError].} =
|
|
## The function merges the argument `proof` list of RLP encoded node records
|
|
## into the `Aristo Trie` database. This function is intended to be used with
|
|
## the proof nodes as returened by `snap/1` messages.
|
|
##
|
|
## Caveat:
|
|
## Proof of concept, not in production yet.
|
|
##
|
|
proc update(
|
|
seen: var Table[HashKey,NodeRef];
|
|
todo: var KeyedQueueNV[NodeRef];
|
|
key: HashKey;
|
|
) {.gcsafe, raises: [RlpError].} =
|
|
## Check for embedded nodes, i.e. fully encoded node instead of a hash
|
|
if key.isValid and key.len < 32:
|
|
let lid = @key.digestTo(HashKey)
|
|
if not seen.hasKey lid:
|
|
let node = @key.decode(NodeRef)
|
|
discard todo.append node
|
|
seen[lid] = node
|
|
|
|
if not rootVid.isValid:
|
|
return err(MergeRootVidInvalid)
|
|
let rootKey = db.getKey rootVid
|
|
if not rootKey.isValid:
|
|
return err(MergeRootKeyInvalid)
|
|
# Make sure that the reverse lookup for the root vertex key is available.
|
|
if not db.layerGetProofVidOrVoid(rootKey).isValid:
|
|
return err(MergeProofInitMissing)
|
|
|
|
# Expand and collect hash keys and nodes
|
|
var nodeTab: Table[HashKey,NodeRef]
|
|
for w in proof:
|
|
let
|
|
key = w.Blob.digestTo(HashKey)
|
|
node = rlp.decode(w.Blob,NodeRef)
|
|
if node.error != AristoError(0):
|
|
return err(node.error)
|
|
nodeTab[key] = node
|
|
|
|
# Check for embedded nodes, i.e. fully encoded node instead of a hash
|
|
var embNodes: KeyedQueueNV[NodeRef]
|
|
discard embNodes.append node
|
|
while true:
|
|
let node = embNodes.shift.valueOr: break
|
|
case node.vType:
|
|
of Leaf:
|
|
discard
|
|
of Branch:
|
|
for n in 0 .. 15:
|
|
nodeTab.update(embNodes, node.key[n])
|
|
of Extension:
|
|
nodeTab.update(embNodes, node.key[0])
|
|
|
|
# Create a table with back links
|
|
var
|
|
backLink: Table[HashKey,HashKey]
|
|
blindNodes: HashSet[HashKey]
|
|
for (key,node) in nodeTab.pairs:
|
|
case node.vType:
|
|
of Leaf:
|
|
blindNodes.incl key
|
|
of Extension:
|
|
if nodeTab.hasKey node.key[0]:
|
|
backLink[node.key[0]] = key
|
|
else:
|
|
blindNodes.incl key
|
|
of Branch:
|
|
var isBlind = true
|
|
for n in 0 .. 15:
|
|
if nodeTab.hasKey node.key[n]:
|
|
isBlind = false
|
|
backLink[node.key[n]] = key
|
|
if isBlind:
|
|
blindNodes.incl key
|
|
|
|
# Run over blind nodes and build chains from a blind/bottom level node up
|
|
# to the root node. Select only chains that end up at the pre-defined root
|
|
# node.
|
|
var chains: seq[seq[HashKey]]
|
|
for w in blindNodes:
|
|
# Build a chain of nodes up to the root node
|
|
var
|
|
chain: seq[HashKey]
|
|
nodeKey = w
|
|
while nodeKey.isValid and nodeTab.hasKey nodeKey:
|
|
chain.add nodeKey
|
|
nodeKey = backLink.getOrVoid nodeKey
|
|
if 0 < chain.len and chain[^1] == rootKey:
|
|
chains.add chain
|
|
|
|
# Process over chains in reverse mode starting with the root node. This
|
|
# allows the algorithm to find existing nodes on the backend.
|
|
var
|
|
seen: HashSet[HashKey]
|
|
merged = 0
|
|
# Process the root ID which is common to all chains
|
|
for chain in chains:
|
|
for key in chain.reversed:
|
|
if key notin seen:
|
|
seen.incl key
|
|
db.mergeNodeImpl(key, nodeTab.getOrVoid key, rootVid).isOkOr:
|
|
return err(error)
|
|
merged.inc
|
|
|
|
ok merged
|
|
|
|
|
|
proc merge*(
|
|
db: AristoDbRef; # Database, top layer
|
|
rootHash: Hash256; # Merkle hash for root
|
|
rootVid = VertexID(0); # Optionally, force root vertex ID
|
|
): Result[VertexID,AristoError] =
|
|
## Set up a `rootKey` associated with a vertex ID for use with proof nodes.
|
|
##
|
|
## If argument `rootVid` is unset then a new dybamic root vertex (i.e.
|
|
## the ID will be at least `LEAST_FREE_VID`) will be installed.
|
|
##
|
|
## Otherwise, if the argument `rootVid` is set then a sub-trie with root
|
|
## `rootVid` is checked for. An error is returned if it is set up already
|
|
## with a different `rootHash`.
|
|
##
|
|
## Upon successful return, the vertex ID assigned to the root key is returned.
|
|
##
|
|
## Caveat:
|
|
## Proof of concept, not in production yet.
|
|
##
|
|
let rootKey = rootHash.to(HashKey)
|
|
|
|
if rootVid.isValid:
|
|
let key = db.getKey rootVid
|
|
if key.isValid:
|
|
if rootKey.isValid and key != rootKey:
|
|
# Cannot use installed root key differing from hash argument
|
|
return err(MergeRootKeyDiffersForVid)
|
|
# Confirm root ID and key for proof nodes processing
|
|
db.layersPutProof(rootVid, key) # note that `rootKey` might be void
|
|
return ok rootVid
|
|
|
|
if not rootHash.isValid:
|
|
return err(MergeRootArgsIncomplete)
|
|
if db.getVtx(rootVid).isValid:
|
|
# Cannot use verify root key for existing root vertex
|
|
return err(MergeRootKeyMissing)
|
|
|
|
# Confirm root ID and hash key for proof nodes processing
|
|
db.layersPutProof(rootVid, rootKey)
|
|
return ok rootVid
|
|
|
|
if not rootHash.isValid:
|
|
return err(MergeRootArgsIncomplete)
|
|
|
|
# Now there is no root vertex ID, only the hash argument.
|
|
# So Create and assign a new root key.
|
|
let vid = db.vidFetch
|
|
db.layersPutProof(vid, rootKey)
|
|
return ok vid
|
|
|
|
|
|
proc merge*(
|
|
db: AristoDbRef; # Database, top layer
|
|
rootVid: VertexID; # Root ID
|
|
): Result[VertexID,AristoError] =
|
|
## Variant of `merge()` for missing `rootHash`
|
|
db.merge(EMPTY_ROOT_HASH, rootVid)
|
|
|
|
# ------------------------------------------------------------------------------
|
|
# End
|
|
# ------------------------------------------------------------------------------
|