nim-eth/eth/trie/hexary.nim

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import
std/tables,
nimcrypto/[keccak, hash],
../rlp,
"."/[trie_defs, nibbles, db]
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type
TrieNodeKey = object
hash: KeccakHash
usedBytes: uint8
DB = TrieDatabaseRef
HexaryTrie* = object
db*: DB
root: TrieNodeKey
isPruning: bool
SecureHexaryTrie* = distinct HexaryTrie
template len(key: TrieNodeKey): int =
key.usedBytes.int
proc keccak*(r: openArray[byte]): KeccakHash =
keccak256.digest r
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template asDbKey(k: TrieNodeKey): untyped =
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doAssert k.usedBytes == 32
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k.hash.data
proc expectHash(r: Rlp): seq[byte] =
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result = r.toBytes
if result.len != 32:
raise newException(RlpTypeMismatch,
"RLP expected to be a Keccak hash value, but has an incorrect length")
proc dbPut(db: DB, data: openArray[byte]): TrieNodeKey {.gcsafe.}
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template get(db: DB, key: Rlp): seq[byte] =
db.get(key.expectHash)
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converter toTrieNodeKey(hash: KeccakHash): TrieNodeKey =
result.hash = hash
result.usedBytes = 32
proc initHexaryTrie*(db: DB, rootHash: KeccakHash, isPruning = true): HexaryTrie =
result.db = db
result.root = rootHash
result.isPruning = isPruning
template initSecureHexaryTrie*(db: DB, rootHash: KeccakHash, isPruning = true): SecureHexaryTrie =
SecureHexaryTrie initHexaryTrie(db, rootHash, isPruning)
proc initHexaryTrie*(db: DB, isPruning = true): HexaryTrie =
result.db = db
result.root = result.db.dbPut(emptyRlp)
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result.isPruning = isPruning
template initSecureHexaryTrie*(db: DB, isPruning = true): SecureHexaryTrie =
SecureHexaryTrie initHexaryTrie(db, isPruning)
proc rootHash*(t: HexaryTrie): KeccakHash =
t.root.hash
proc rootHashHex*(t: HexaryTrie): string =
$t.root.hash
template prune(t: HexaryTrie, x: openArray[byte]) =
if t.isPruning: t.db.del(x)
proc isPruning*(t: HexaryTrie): bool =
t.isPruning
proc getLocalBytes(x: TrieNodeKey): seq[byte] =
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## This proc should be used on nodes using the optimization
## of short values within the key.
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doAssert x.usedBytes < 32
x.hash.data[0..<x.usedBytes]
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template keyToLocalBytes(db: DB, k: TrieNodeKey): seq[byte] =
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if k.len < 32: k.getLocalBytes
else: db.get(k.asDbKey)
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template extensionNodeKey(r: Rlp): auto =
hexPrefixDecode r.listElem(0).toBytes
proc getAux(db: DB, nodeRlp: Rlp, path: NibblesSeq): seq[byte] {.gcsafe.}
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proc getAuxByHash(db: DB, node: TrieNodeKey, path: NibblesSeq): seq[byte] =
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var nodeRlp = rlpFromBytes keyToLocalBytes(db, node)
return getAux(db, nodeRlp, path)
template getLookup(elem: untyped): untyped =
if elem.isList: elem
else: rlpFromBytes(get(db, elem.expectHash))
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proc getAux(db: DB, nodeRlp: Rlp, path: NibblesSeq): seq[byte] =
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if not nodeRlp.hasData or nodeRlp.isEmpty:
return
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case nodeRlp.listLen
of 2:
let (isLeaf, k) = nodeRlp.extensionNodeKey
let sharedNibbles = sharedPrefixLen(path, k)
if sharedNibbles == k.len:
let value = nodeRlp.listElem(1)
if sharedNibbles == path.len and isLeaf:
return value.toBytes
elif not isLeaf:
let nextLookup = value.getLookup
return getAux(db, nextLookup, path.slice(sharedNibbles))
return
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of 17:
if path.len == 0:
return nodeRlp.listElem(16).toBytes
var branch = nodeRlp.listElem(path[0].int)
if branch.isEmpty:
return
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else:
let nextLookup = branch.getLookup
return getAux(db, nextLookup, path.slice(1))
else:
raise newException(CorruptedTrieDatabase,
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"HexaryTrie node with an unexpected number of children")
proc get*(self: HexaryTrie; key: openArray[byte]): seq[byte] =
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return getAuxByHash(self.db, self.root, initNibbleRange(key))
proc getKeysAux(db: DB, stack: var seq[tuple[nodeRlp: Rlp, path: NibblesSeq]]): seq[byte] =
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while stack.len > 0:
let (nodeRlp, path) = stack.pop()
if not nodeRlp.hasData or nodeRlp.isEmpty:
continue
case nodeRlp.listLen
of 2:
let
(isLeaf, k) = nodeRlp.extensionNodeKey
key = path & k
if isLeaf:
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doAssert(key.len mod 2 == 0)
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return key.getBytes
else:
let
value = nodeRlp.listElem(1)
nextLookup = value.getLookup
stack.add((nextLookup, key))
of 17:
for i in 0 ..< 16:
var branch = nodeRlp.listElem(i)
if not branch.isEmpty:
let nextLookup = branch.getLookup
var key = path.cloneAndReserveNibble()
key.replaceLastNibble(i.byte)
stack.add((nextLookup, key))
var lastElem = nodeRlp.listElem(16)
if not lastElem.isEmpty:
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doAssert(path.len mod 2 == 0)
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return path.getBytes
else:
raise newException(CorruptedTrieDatabase,
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"HexaryTrie node with an unexpected number of children")
iterator keys*(self: HexaryTrie): seq[byte] =
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var
nodeRlp = rlpFromBytes keyToLocalBytes(self.db, self.root)
stack = @[(nodeRlp, initNibbleRange([]))]
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while stack.len > 0:
yield getKeysAux(self.db, stack)
proc getValuesAux(db: DB, stack: var seq[Rlp]): seq[byte] =
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while stack.len > 0:
let nodeRlp = stack.pop()
if not nodeRlp.hasData or nodeRlp.isEmpty:
continue
case nodeRlp.listLen
of 2:
let
(isLeaf, _) = nodeRlp.extensionNodeKey
value = nodeRlp.listElem(1)
if isLeaf:
return value.toBytes
else:
let nextLookup = value.getLookup
stack.add(nextLookup)
of 17:
for i in 0 ..< 16:
var branch = nodeRlp.listElem(i)
if not branch.isEmpty:
let nextLookup = branch.getLookup
stack.add(nextLookup)
var lastElem = nodeRlp.listElem(16)
if not lastElem.isEmpty:
return lastElem.toBytes
else:
raise newException(CorruptedTrieDatabase,
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"HexaryTrie node with an unexpected number of children")
iterator values*(self: HexaryTrie): seq[byte] =
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var
nodeRlp = rlpFromBytes keyToLocalBytes(self.db, self.root)
stack = @[nodeRlp]
while stack.len > 0:
yield getValuesAux(self.db, stack)
proc getPairsAux(db: DB, stack: var seq[tuple[nodeRlp: Rlp, path: NibblesSeq]]): (seq[byte], seq[byte]) =
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while stack.len > 0:
let (nodeRlp, path) = stack.pop()
if not nodeRlp.hasData or nodeRlp.isEmpty:
continue
case nodeRlp.listLen
of 2:
let
(isLeaf, k) = nodeRlp.extensionNodeKey
key = path & k
value = nodeRlp.listElem(1)
if isLeaf:
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doAssert(key.len mod 2 == 0)
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return (key.getBytes, value.toBytes)
else:
let nextLookup = value.getLookup
stack.add((nextLookup, key))
of 17:
for i in 0 ..< 16:
var branch = nodeRlp.listElem(i)
if not branch.isEmpty:
let nextLookup = branch.getLookup
var key = path.cloneAndReserveNibble()
key.replaceLastNibble(i.byte)
stack.add((nextLookup, key))
var lastElem = nodeRlp.listElem(16)
if not lastElem.isEmpty:
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doAssert(path.len mod 2 == 0)
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return (path.getBytes, lastElem.toBytes)
else:
raise newException(CorruptedTrieDatabase,
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"HexaryTrie node with an unexpected number of children")
iterator pairs*(self: HexaryTrie): (seq[byte], seq[byte]) =
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var
nodeRlp = rlpFromBytes keyToLocalBytes(self.db, self.root)
stack = @[(nodeRlp, initNibbleRange([]))]
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while stack.len > 0:
# perhaps a Nim bug #9778
# cannot yield the helper proc directly
# it will cut the yield in half
let res = getPairsAux(self.db, stack)
yield res
iterator replicate*(self: HexaryTrie): (seq[byte], seq[byte]) =
# this iterator helps 'rebuild' the entire trie without
# going through a trie algorithm, but it will pull the entire
# low level KV pairs. Thus the target db will only use put operations
# without del or contains, can speed up huge trie replication.
var
localBytes = keyToLocalBytes(self.db, self.root)
nodeRlp = rlpFromBytes localBytes
stack = @[(nodeRlp, initNibbleRange([]))]
template pushOrYield(elem: untyped) =
if elem.isList:
stack.add((elem, key))
else:
let rlpBytes = get(self.db, elem.expectHash)
let nextLookup = rlpFromBytes(rlpBytes)
stack.add((nextLookup, key))
yield (elem.toBytes, rlpBytes)
yield (@(self.rootHash.data), localBytes)
while stack.len > 0:
let (nodeRlp, path) = stack.pop()
if not nodeRlp.hasData or nodeRlp.isEmpty:
continue
case nodeRlp.listLen
of 2:
let
(isLeaf, k) = nodeRlp.extensionNodeKey
key = path & k
value = nodeRlp.listElem(1)
if not isLeaf: pushOrYield(value)
of 17:
for i in 0 ..< 16:
var branch = nodeRlp.listElem(i)
if not branch.isEmpty:
var key = path.cloneAndReserveNibble()
key.replaceLastNibble(i.byte)
pushOrYield(branch)
else:
raise newException(CorruptedTrieDatabase,
"HexaryTrie node with an unexpected number of children")
proc getValues*(self: HexaryTrie): seq[seq[byte]] =
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result = @[]
for v in self.values:
result.add v
proc getKeys*(self: HexaryTrie): seq[seq[byte]] =
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result = @[]
for k in self.keys:
result.add k
template getNode(elem: untyped): untyped =
if elem.isList: @(elem.rawData)
else: get(db, elem.expectHash)
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proc getBranchAux(db: DB, node: openArray[byte], path: NibblesSeq, output: var seq[seq[byte]]) =
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var nodeRlp = rlpFromBytes node
if not nodeRlp.hasData or nodeRlp.isEmpty: return
case nodeRlp.listLen
of 2:
let (isLeaf, k) = nodeRlp.extensionNodeKey
let sharedNibbles = sharedPrefixLen(path, k)
if sharedNibbles == k.len:
let value = nodeRlp.listElem(1)
if not isLeaf:
let nextLookup = value.getNode
output.add nextLookup
getBranchAux(db, nextLookup, path.slice(sharedNibbles), output)
of 17:
if path.len != 0:
var branch = nodeRlp.listElem(path[0].int)
if not branch.isEmpty:
let nextLookup = branch.getNode
output.add nextLookup
getBranchAux(db, nextLookup, path.slice(1), output)
else:
raise newException(CorruptedTrieDatabase,
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"HexaryTrie node with an unexpected number of children")
proc getBranch*(self: HexaryTrie; key: openArray[byte]): seq[seq[byte]] =
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result = @[]
var node = keyToLocalBytes(self.db, self.root)
result.add node
getBranchAux(self.db, node, initNibbleRange(key), result)
proc dbDel(t: var HexaryTrie, data: openArray[byte]) =
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if data.len >= 32: t.prune(data.keccak.data)
proc dbPut(db: DB, data: openArray[byte]): TrieNodeKey =
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result.hash = data.keccak
result.usedBytes = 32
put(db, result.asDbKey, data)
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proc appendAndSave(rlpWriter: var RlpWriter, data: openArray[byte], db: DB) =
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if data.len >= 32:
var nodeKey = dbPut(db, data)
rlpWriter.append(nodeKey.hash)
else:
rlpWriter.appendRawBytes(data)
proc isTrieBranch(rlp: Rlp): bool =
rlp.isList and (var len = rlp.listLen; len == 2 or len == 17)
proc replaceValue(data: Rlp, key: NibblesSeq, value: openArray[byte]): seq[byte] =
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if data.isEmpty:
let prefix = hexPrefixEncode(key, true)
return encodeList(prefix, value)
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doAssert data.isTrieBranch
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if data.listLen == 2:
return encodeList(data.listElem(0), value)
var r = initRlpList(17)
# XXX: This can be optimized to a direct bitwise copy of the source RLP
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var iter = data
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# We already know that we are working with a list
doAssert iter.enterList()
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for i in 0 ..< 16:
r.append iter
iter.skipElem
r.append value
return r.finish()
proc isTwoItemNode(self: HexaryTrie; r: Rlp): bool =
if r.isBlob:
let resolved = self.db.get(r)
let rlp = rlpFromBytes(resolved)
return rlp.isList and rlp.listLen == 2
else:
return r.isList and r.listLen == 2
proc findSingleChild(r: Rlp; childPos: var byte): Rlp =
result = zeroBytesRlp
var i: byte = 0
var rlp = r
for elem in rlp:
if not elem.isEmpty:
if not result.hasData:
result = elem
childPos = i
else:
return zeroBytesRlp
inc i
proc deleteAt(self: var HexaryTrie; origRlp: Rlp, key: NibblesSeq): seq[byte] {.gcsafe.}
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proc deleteAux(self: var HexaryTrie; rlpWriter: var RlpWriter;
origRlp: Rlp; path: NibblesSeq): bool =
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if origRlp.isEmpty:
return false
var toDelete = if origRlp.isList: origRlp
else: rlpFromBytes self.db.get(origRlp)
let b = self.deleteAt(toDelete, path)
if b.len == 0:
return false
rlpWriter.appendAndSave(b, self.db)
return true
proc graft(self: var HexaryTrie; r: Rlp): seq[byte] =
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doAssert r.isList and r.listLen == 2
var (_, origPath) = r.extensionNodeKey
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var value = r.listElem(1)
if not value.isList:
let nodeKey = value.expectHash
var resolvedData = self.db.get(nodeKey)
self.prune(nodeKey)
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value = rlpFromBytes resolvedData
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doAssert value.listLen == 2
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let (valueIsLeaf, valueKey) = value.extensionNodeKey
var rlpWriter = initRlpList(2)
rlpWriter.append hexPrefixEncode(origPath, valueKey, valueIsLeaf)
rlpWriter.append value.listElem(1)
return rlpWriter.finish
proc mergeAndGraft(self: var HexaryTrie;
soleChild: Rlp, childPos: byte): seq[byte] =
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var output = initRlpList(2)
if childPos == 16:
output.append hexPrefixEncode(NibblesSeq(), true)
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else:
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doAssert(not soleChild.isEmpty)
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output.append int(hexPrefixEncodeByte(childPos))
output.append(soleChild)
result = output.finish()
if self.isTwoItemNode(soleChild):
result = self.graft(rlpFromBytes(result))
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proc deleteAt(self: var HexaryTrie;
origRlp: Rlp, key: NibblesSeq): seq[byte] =
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if origRlp.isEmpty:
return
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doAssert origRlp.isTrieBranch
let origBytes = @(origRlp.rawData)
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if origRlp.listLen == 2:
let (isLeaf, k) = origRlp.extensionNodeKey
if k == key and isLeaf:
self.dbDel origBytes
return emptyRlp
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if key.startsWith(k):
var
rlpWriter = initRlpList(2)
path = origRlp.listElem(0)
value = origRlp.listElem(1)
rlpWriter.append(path)
if not self.deleteAux(rlpWriter, value, key.slice(k.len)):
return
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self.dbDel origBytes
var finalBytes = rlpWriter.finish
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var rlp = rlpFromBytes(finalBytes)
if self.isTwoItemNode(rlp.listElem(1)):
return self.graft(rlp)
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return finalBytes
else:
return
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else:
if key.len == 0 and origRlp.listElem(16).isEmpty:
self.dbDel origBytes
var foundChildPos: byte
let singleChild = origRlp.findSingleChild(foundChildPos)
if singleChild.hasData and foundChildPos != 16:
result = self.mergeAndGraft(singleChild, foundChildPos)
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else:
var rlpRes = initRlpList(17)
var iter = origRlp
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# We already know that we are working with a list
doAssert iter.enterList
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for i in 0 ..< 16:
rlpRes.append iter
iter.skipElem
rlpRes.append ""
return rlpRes.finish
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else:
var rlpWriter = initRlpList(17)
let keyHead = int(key[0])
var i = 0
var origCopy = origRlp
for elem in items(origCopy):
if i == keyHead:
if not self.deleteAux(rlpWriter, elem, key.slice(1)):
return
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else:
rlpWriter.append(elem)
inc i
self.dbDel origBytes
result = rlpWriter.finish
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var resultRlp = rlpFromBytes(result)
var foundChildPos: byte
let singleChild = resultRlp.findSingleChild(foundChildPos)
if singleChild.hasData:
result = self.mergeAndGraft(singleChild, foundChildPos)
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proc del*(self: var HexaryTrie; key: openArray[byte]) =
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var
rootBytes = keyToLocalBytes(self.db, self.root)
rootRlp = rlpFromBytes rootBytes
var newRootBytes = self.deleteAt(rootRlp, initNibbleRange(key))
if newRootBytes.len > 0:
if rootBytes.len < 32:
self.prune(self.root.asDbKey)
self.root = self.db.dbPut(newRootBytes)
proc mergeAt(self: var HexaryTrie, orig: Rlp, origHash: KeccakHash,
key: NibblesSeq, value: openArray[byte],
isInline = false): seq[byte] {.gcsafe.}
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proc mergeAt(self: var HexaryTrie, rlp: Rlp,
key: NibblesSeq, value: openArray[byte],
isInline = false): seq[byte] =
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self.mergeAt(rlp, rlp.rawData.keccak, key, value, isInline)
proc mergeAtAux(self: var HexaryTrie, output: var RlpWriter, orig: Rlp,
key: NibblesSeq, value: openArray[byte]) =
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var resolved = orig
var isRemovable = false
if not (orig.isList or orig.isEmpty):
resolved = rlpFromBytes self.db.get(orig)
isRemovable = true
let b = self.mergeAt(resolved, key, value, not isRemovable)
output.appendAndSave(b, self.db)
proc mergeAt(self: var HexaryTrie, orig: Rlp, origHash: KeccakHash,
key: NibblesSeq, value: openArray[byte],
isInline = false): seq[byte] =
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template origWithNewValue: auto =
self.prune(origHash.data)
replaceValue(orig, key, value)
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if orig.isEmpty:
return origWithNewValue()
doAssert orig.isTrieBranch, $orig
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if orig.listLen == 2:
let (isLeaf, k) = orig.extensionNodeKey
var origValue = orig.listElem(1)
if k == key and isLeaf:
return origWithNewValue()
let sharedNibbles = sharedPrefixLen(key, k)
if sharedNibbles == k.len and not isLeaf:
var r = initRlpList(2)
r.append orig.listElem(0)
self.mergeAtAux(r, origValue, key.slice(k.len), value)
return r.finish
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if orig.rawData.len >= 32:
self.prune(origHash.data)
if sharedNibbles > 0:
# Split the extension node
var bottom = initRlpList(2)
bottom.append hexPrefixEncode(k.slice(sharedNibbles), isLeaf)
bottom.append origValue
var top = initRlpList(2)
top.append hexPrefixEncode(k.slice(0, sharedNibbles), false)
top.appendAndSave(bottom.finish, self.db)
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return self.mergeAt(rlpFromBytes(top.finish), key, value, true)
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else:
# Create a branch node
var branches = initRlpList(17)
if k.len == 0:
# The key is now exhausted. This must be a leaf node
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doAssert isLeaf
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for i in 0 ..< 16:
branches.append ""
branches.append origValue
else:
let n = k[0]
for i in 0 ..< 16:
if byte(i) == n:
if isLeaf or k.len > 1:
let childNode = encodeList(hexPrefixEncode(k.slice(1), isLeaf),
origValue)
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branches.appendAndSave(childNode, self.db)
else:
branches.append origValue
else:
branches.append ""
branches.append ""
return self.mergeAt(rlpFromBytes(branches.finish), key, value, true)
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else:
if key.len == 0:
return origWithNewValue()
if isInline:
self.prune(origHash.data)
let n = key[0]
var i = 0
var r = initRlpList(17)
var origCopy = orig
for elem in items(origCopy):
if i == int(n):
self.mergeAtAux(r, elem, key.slice(1), value)
else:
r.append(elem)
inc i
return r.finish
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proc put*(self: var HexaryTrie; key, value: openArray[byte]) =
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let root = self.root.hash
var rootBytes = self.db.get(root.data)
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doAssert rootBytes.len > 0
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let newRootBytes = self.mergeAt(rlpFromBytes(rootBytes), root,
initNibbleRange(key), value)
if rootBytes.len < 32:
self.prune(root.data)
self.root = self.db.dbPut(newRootBytes)
proc put*(self: var SecureHexaryTrie; key, value: openArray[byte]) =
put(HexaryTrie(self), key.keccak.data, value)
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proc get*(self: SecureHexaryTrie; key: openArray[byte]): seq[byte] =
return get(HexaryTrie(self), key.keccak.data)
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proc del*(self: var SecureHexaryTrie; key: openArray[byte]) =
del(HexaryTrie(self), key.keccak.data)
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proc rootHash*(self: SecureHexaryTrie): KeccakHash {.borrow.}
proc rootHashHex*(self: SecureHexaryTrie): string {.borrow.}
proc isPruning*(self: SecureHexaryTrie): bool {.borrow.}
template contains*(self: HexaryTrie | SecureHexaryTrie;
key: openArray[byte]): bool =
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self.get(key).len > 0