nimbus-eth1/nimbus/sync/snap/worker/db/hexary_import.nim

127 lines
4.0 KiB
Nim

# nimbus-eth1
# Copyright (c) 2021 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
# http://www.apache.org/licenses/LICENSE-2.0)
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
# http://opensource.org/licenses/MIT)
# at your option. This file may not be copied, modified, or distributed
# except according to those terms.
import
std/[sequtils, sets, strutils, tables],
eth/[common/eth_types_rlp, trie/nibbles],
stew/results,
"."/[hexary_defs, hexary_desc]
{.push raises: [Defect].}
# ------------------------------------------------------------------------------
# Private debugging helpers
# ------------------------------------------------------------------------------
proc pp(q: openArray[byte]): string =
q.toSeq.mapIt(it.toHex(2)).join.toLowerAscii.pp(hex = true)
# ------------------------------------------------------------------------------
# Public
# ------------------------------------------------------------------------------
proc hexaryImport*(
db: var HexaryTreeDB; ## Contains node table
recData: Blob; ## Node to add
unrefNodes: var HashSet[RepairKey]; ## Keep track of freestanding nodes
nodeRefs: var HashSet[RepairKey]; ## Ditto
): Result[void,HexaryDbError]
{.gcsafe, raises: [Defect, RlpError, KeyError].} =
## Decode a single trie item for adding to the table and add it to the
## database. Branch and exrension record links are collected.
let
nodeKey = recData.digestTo(NodeKey)
repairKey = nodeKey.to(RepairKey) # for repair table
var
rlp = recData.rlpFromBytes
blobs = newSeq[Blob](2) # temporary, cache
links: array[16,RepairKey] # reconstruct branch node
blob16: Blob # reconstruct branch node
top = 0 # count entries
rNode: RNodeRef # repair tree node
# Collect lists of either 2 or 17 blob entries.
for w in rlp.items:
case top
of 0, 1:
if not w.isBlob:
return err(RlpBlobExpected)
blobs[top] = rlp.read(Blob)
of 2 .. 15:
var key: NodeKey
if not key.init(rlp.read(Blob)):
return err(RlpBranchLinkExpected)
# Update ref pool
links[top] = key.to(RepairKey)
unrefNodes.excl links[top] # is referenced, now (if any)
nodeRefs.incl links[top]
of 16:
if not w.isBlob:
return err(RlpBlobExpected)
blob16 = rlp.read(Blob)
else:
return err(Rlp2Or17ListEntries)
top.inc
# Verify extension data
case top
of 2:
if blobs[0].len == 0:
return err(RlpNonEmptyBlobExpected)
let (isLeaf, pathSegment) = hexPrefixDecode blobs[0]
if isLeaf:
rNode = RNodeRef(
kind: Leaf,
lPfx: pathSegment,
lData: blobs[1])
else:
var key: NodeKey
if not key.init(blobs[1]):
return err(RlpExtPathEncoding)
# Update ref pool
rNode = RNodeRef(
kind: Extension,
ePfx: pathSegment,
eLink: key.to(RepairKey))
unrefNodes.excl rNode.eLink # is referenced, now (if any)
nodeRefs.incl rNode.eLink
of 17:
for n in [0,1]:
var key: NodeKey
if not key.init(blobs[n]):
return err(RlpBranchLinkExpected)
# Update ref pool
links[n] = key.to(RepairKey)
unrefNodes.excl links[n] # is referenced, now (if any)
nodeRefs.incl links[n]
rNode = RNodeRef(
kind: Branch,
bLink: links,
bData: blob16)
else:
discard
# Add to database
if not db.tab.hasKey(repairKey):
db.tab[repairKey] = rNode
# Update unreferenced nodes list
if repairKey notin nodeRefs:
unrefNodes.incl repairKey # keep track of stray nodes
elif db.tab[repairKey].convertTo(Blob) != recData:
return err(DifferentNodeValueExists)
ok()
# ------------------------------------------------------------------------------
# End
# ------------------------------------------------------------------------------