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add some remarks on interesting findings during experiment

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andri lim 2020-04-24 19:15:15 +07:00
parent 9589f9cd90
commit a1a6b7b9c4
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1 changed files with 11 additions and 0 deletions
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11
stateless/witness_from_tree.nim
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@ -109,6 +109,11 @@ proc writeShortNode(wb: var WitnessBuilder, node: openArray[byte], depth: int) =
if isLeaf:
writeAccountNode(wb, node, depth)
else:
# why this short extension node have no
# child and still valid when we reconstruct
# the trie on the other side?
# a bug in hexary trie algo?
# or a bug in nim hexary trie implementation?
writeExtensionNode(wb, k, depth, node)
of 17:
let branchMask = rlpListToBitmask(nodeRlp)
@ -120,6 +125,10 @@ proc writeShortNode(wb: var WitnessBuilder, node: openArray[byte], depth: int) =
let nextLookup = branch.getNode
writeShortNode(wb, nextLookup, depth + 1)
# contrary to yellow paper spec,
# the 17th elem never exist in reality.
# block witness spec also omit it.
# probably a flaw in hexary trie design
# 17th elem should always empty
doAssert branchMask.branchMaskBitIsSet(16) == false
else:
@ -144,6 +153,7 @@ proc getBranchRecurseAux(wb: var WitnessBuilder, node: openArray[byte], path: Ni
# AccountNodeType
writeAccountNode(wb, node, depth)
else:
# this is a potential branch for multiproof
writeHashNode(wb, keccak(node).data)
of 17:
let branchMask = rlpListToBitmask(nodeRlp)
@ -161,6 +171,7 @@ proc getBranchRecurseAux(wb: var WitnessBuilder, node: openArray[byte], path: Ni
let nextLookup = branch.getNode
writeShortNode(wb, nextLookup, depth + 1)
else:
# this is a potential branch for multiproof
writeHashNode(wb, branch.expectHash)
# 17th elem should always empty