338 lines
10 KiB
Nim
338 lines
10 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 delete funcionality
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## ==============================================
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##
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## Delete by `Hike` type chain of vertices.
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{.push raises: [].}
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import
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std/typetraits,
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eth/common,
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results,
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"."/[aristo_desc, aristo_fetch, aristo_get, aristo_hike, aristo_layers,
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aristo_utils, aristo_vid]
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# ------------------------------------------------------------------------------
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# Private heplers
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# ------------------------------------------------------------------------------
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proc branchStillNeeded(vtx: VertexRef): Result[int,void] =
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## Returns the nibble if there is only one reference left.
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var nibble = -1
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for n in 0 .. 15:
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if vtx.bVid[n].isValid:
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if 0 <= nibble:
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return ok(-1)
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nibble = n
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if 0 <= nibble:
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return ok(nibble)
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# Oops, degenerated branch node
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err()
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# -----------
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proc disposeOfVtx(
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db: AristoDbRef; # Database, top layer
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rvid: RootedVertexID; # Vertex ID to clear
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) =
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# Remove entry
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db.layersResVtx(rvid)
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db.layersResKey(rvid)
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db.vidDispose rvid.vid # Recycle ID
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# ------------------------------------------------------------------------------
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# Private functions
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# ------------------------------------------------------------------------------
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proc delSubTreeImpl(
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db: AristoDbRef; # Database, top layer
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root: VertexID; # Root vertex
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): Result[void,AristoError] =
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## Implementation of *delete* sub-trie.
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var
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dispose = @[root]
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(rootVtx, _) = db.getVtxRc((root, root)).valueOr:
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if error == GetVtxNotFound:
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return ok()
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return err(error)
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follow = @[rootVtx]
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# Collect list of nodes to delete
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while 0 < follow.len:
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var redo: seq[VertexRef]
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for vtx in follow:
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for vid in vtx.subVids:
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# Exiting here leaves the tree as-is
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let vtx = (? db.getVtxRc((root, vid)))[0]
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redo.add vtx
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dispose.add vid
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redo.swap follow
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# Mark collected vertices to be deleted
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for vid in dispose:
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db.disposeOfVtx((root, vid))
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ok()
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proc delStoTreeImpl(
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db: AristoDbRef; # Database, top layer
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rvid: RootedVertexID; # Root vertex
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accPath: Hash256;
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stoPath: NibblesBuf;
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): Result[void,AristoError] =
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## Implementation of *delete* sub-trie.
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let (vtx, _) = db.getVtxRc(rvid).valueOr:
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if error == GetVtxNotFound:
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return ok()
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return err(error)
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case vtx.vType
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of Branch:
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for i in 0..15:
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if vtx.bVid[i].isValid:
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? db.delStoTreeImpl(
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(rvid.root, vtx.bVid[i]), accPath,
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stoPath & vtx.ePfx & NibblesBuf.nibble(byte i))
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of Leaf:
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let stoPath = Hash256(data: (stoPath & vtx.lPfx).getBytes())
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db.layersPutStoLeaf(AccountKey.mixUp(accPath, stoPath), nil)
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db.disposeOfVtx(rvid)
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ok()
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proc deleteImpl(
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db: AristoDbRef; # Database, top layer
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hike: Hike; # Fully expanded path
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): Result[void,AristoError] =
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## Implementation of *delete* functionality.
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# Remove leaf entry
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let lf = hike.legs[^1].wp
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if lf.vtx.vType != Leaf:
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return err(DelLeafExpexted)
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db.disposeOfVtx((hike.root, lf.vid))
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if 1 < hike.legs.len:
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# Get current `Branch` vertex `br`
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let br = block:
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var wp = hike.legs[^2].wp
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wp.vtx = wp.vtx.dup # make sure that layers are not impliciteley modified
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wp
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if br.vtx.vType != Branch:
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return err(DelBranchExpexted)
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# Unlink child vertex from structural table
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br.vtx.bVid[hike.legs[^2].nibble] = VertexID(0)
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db.layersPutVtx((hike.root, br.vid), br.vtx)
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# Clear all Merkle hash keys up to the root key
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for n in 0 .. hike.legs.len - 2:
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let vid = hike.legs[n].wp.vid
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db.layersResKey((hike.root, vid))
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let nbl = block:
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let rc = br.vtx.branchStillNeeded()
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if rc.isErr:
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return err(DelBranchWithoutRefs)
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rc.value
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if 0 <= nbl:
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# Branch has only one entry - convert it to a leaf or join with parent
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# Get child vertex (there must be one after a `Branch` node)
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let
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vid = br.vtx.bVid[nbl]
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nxt = db.getVtx (hike.root, vid)
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if not nxt.isValid:
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return err(DelVidStaleVtx)
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db.disposeOfVtx((hike.root, vid))
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let vtx =
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case nxt.vType
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of Leaf:
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VertexRef(
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vType: Leaf,
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lPfx: br.vtx.ePfx & NibblesBuf.nibble(nbl.byte) & nxt.lPfx,
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lData: nxt.lData)
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of Branch:
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VertexRef(
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vType: Branch,
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ePfx: br.vtx.ePfx & NibblesBuf.nibble(nbl.byte) & nxt.ePfx,
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bVid: nxt.bVid)
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# Put the new vertex at the id of the obsolete branch
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db.layersPutVtx((hike.root, br.vid), vtx)
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ok()
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc deleteAccountRecord*(
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db: AristoDbRef;
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accPath: Hash256;
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): Result[void,AristoError] =
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## Delete the account leaf entry addressed by the argument `path`. If this
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## leaf entry referres to a storage tree, this one will be deleted as well.
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##
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let
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hike = accPath.hikeUp(VertexID(1), db).valueOr:
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if error[1] in HikeAcceptableStopsNotFound:
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return err(DelPathNotFound)
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return err(error[1])
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stoID = hike.legs[^1].wp.vtx.lData.stoID
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# Delete storage tree if present
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if stoID.isValid:
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? db.delStoTreeImpl((stoID, stoID), accPath, NibblesBuf())
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?db.deleteImpl(hike)
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db.layersPutAccLeaf(accPath, nil)
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ok()
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proc deleteGenericData*(
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db: AristoDbRef;
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root: VertexID;
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path: openArray[byte];
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): Result[bool,AristoError] =
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## Delete the leaf data entry addressed by the argument `path`. The MPT
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## sub-tree the leaf data entry is subsumed under is passed as argument
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## `root` which must be greater than `VertexID(1)` and smaller than
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## `LEAST_FREE_VID`.
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##
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## The return value is `true` if the argument `path` deleted was the last
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## one and the tree does not exist anymore.
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##
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# Verify that `root` is neither an accounts tree nor a strorage tree.
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if not root.isValid:
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return err(DelRootVidMissing)
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elif root == VertexID(1):
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return err(DelAccRootNotAccepted)
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elif LEAST_FREE_VID <= root.distinctBase:
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return err(DelStoRootNotAccepted)
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let hike = path.hikeUp(root, db).valueOr:
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if error[1] in HikeAcceptableStopsNotFound:
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return err(DelPathNotFound)
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return err(error[1])
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?db.deleteImpl(hike)
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ok(not db.getVtx((root, root)).isValid)
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proc deleteGenericTree*(
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db: AristoDbRef; # Database, top layer
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root: VertexID; # Root vertex
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): Result[void,AristoError] =
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## Variant of `deleteGenericData()` for purging the whole MPT sub-tree.
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##
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# Verify that `root` is neither an accounts tree nor a strorage tree.
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if not root.isValid:
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return err(DelRootVidMissing)
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elif root == VertexID(1):
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return err(DelAccRootNotAccepted)
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elif LEAST_FREE_VID <= root.distinctBase:
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return err(DelStoRootNotAccepted)
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db.delSubTreeImpl root
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proc deleteStorageData*(
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db: AristoDbRef;
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accPath: Hash256; # Implies storage data tree
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stoPath: Hash256;
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): Result[bool,AristoError] =
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## For a given account argument `accPath`, this function deletes the
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## argument `stoPath` from the associated storage tree (if any, at all.) If
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## the if the argument `stoPath` deleted was the last one on the storage tree,
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## account leaf referred to by `accPath` will be updated so that it will
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## not refer to a storage tree anymore. In the latter case only the function
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## will return `true`.
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##
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let
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accHike = db.fetchAccountHike(accPath).valueOr:
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if error == FetchAccInaccessible:
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return err(DelStoAccMissing)
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return err(error)
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wpAcc = accHike.legs[^1].wp
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stoID = wpAcc.vtx.lData.stoID
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if not stoID.isValid:
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return err(DelStoRootMissing)
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let stoHike = stoPath.hikeUp(stoID, db).valueOr:
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if error[1] in HikeAcceptableStopsNotFound:
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return err(DelPathNotFound)
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return err(error[1])
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# Mark account path Merkle keys for update
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db.updateAccountForHasher accHike
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?db.deleteImpl(stoHike)
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db.layersPutStoLeaf(AccountKey.mixUp(accPath, stoPath), nil)
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# Make sure that an account leaf has no dangling sub-trie
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if db.getVtx((stoID, stoID)).isValid:
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return ok(false)
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# De-register the deleted storage tree from the account record
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let leaf = wpAcc.vtx.dup # Dup on modify
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leaf.lData.stoID = VertexID(0)
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db.layersPutAccLeaf(accPath, leaf)
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db.layersPutVtx((accHike.root, wpAcc.vid), leaf)
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ok(true)
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proc deleteStorageTree*(
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db: AristoDbRef; # Database, top layer
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accPath: Hash256; # Implies storage data tree
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): Result[void,AristoError] =
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## Variant of `deleteStorageData()` for purging the whole storage tree
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## associated to the account argument `accPath`.
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##
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let
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accHike = db.fetchAccountHike(accPath).valueOr:
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if error == FetchAccInaccessible:
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return err(DelStoAccMissing)
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return err(error)
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wpAcc = accHike.legs[^1].wp
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stoID = wpAcc.vtx.lData.stoID
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if not stoID.isValid:
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return err(DelStoRootMissing)
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# Mark account path Merkle keys for update
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db.updateAccountForHasher accHike
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? db.delStoTreeImpl((stoID, stoID), accPath, NibblesBuf())
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# De-register the deleted storage tree from the accounts record
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let leaf = wpAcc.vtx.dup # Dup on modify
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leaf.lData.stoID = VertexID(0)
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db.layersPutAccLeaf(accPath, leaf)
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db.layersPutVtx((accHike.root, wpAcc.vid), leaf)
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ok()
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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