ethtrie => trie
This commit is contained in:
obscuren
76
trie/encoding.go
Normal file
76
trie/encoding.go
Normal file
@ -0,0 +1,76 @@
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package trie
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import (
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"bytes"
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"encoding/hex"
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"strings"
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)
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func CompactEncode(hexSlice []byte) string {
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terminator := 0
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if hexSlice[len(hexSlice)-1] == 16 {
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terminator = 1
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}
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if terminator == 1 {
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hexSlice = hexSlice[:len(hexSlice)-1]
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}
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oddlen := len(hexSlice) % 2
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flags := byte(2*terminator + oddlen)
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if oddlen != 0 {
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hexSlice = append([]byte{flags}, hexSlice...)
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} else {
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hexSlice = append([]byte{flags, 0}, hexSlice...)
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}
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var buff bytes.Buffer
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for i := 0; i < len(hexSlice); i += 2 {
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buff.WriteByte(byte(16*hexSlice[i] + hexSlice[i+1]))
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}
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return buff.String()
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}
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func CompactDecode(str string) []byte {
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base := CompactHexDecode(str)
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base = base[:len(base)-1]
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if base[0] >= 2 {
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base = append(base, 16)
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}
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if base[0]%2 == 1 {
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base = base[1:]
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} else {
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base = base[2:]
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}
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return base
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}
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func CompactHexDecode(str string) []byte {
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base := "0123456789abcdef"
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hexSlice := make([]byte, 0)
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enc := hex.EncodeToString([]byte(str))
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for _, v := range enc {
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hexSlice = append(hexSlice, byte(strings.IndexByte(base, byte(v))))
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}
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hexSlice = append(hexSlice, 16)
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return hexSlice
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}
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func DecodeCompact(key []byte) string {
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base := "0123456789abcdef"
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var str string
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for _, v := range key {
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if v < 16 {
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str += string(base[v])
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}
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}
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res, _ := hex.DecodeString(str)
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return string(res)
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}
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68
trie/encoding_test.go
Normal file
68
trie/encoding_test.go
Normal file
@ -0,0 +1,68 @@
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package trie
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import (
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"bytes"
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"fmt"
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"testing"
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)
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func TestCompactEncode(t *testing.T) {
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test1 := []byte{1, 2, 3, 4, 5}
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if res := CompactEncode(test1); res != "\x11\x23\x45" {
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t.Error(fmt.Sprintf("even compact encode failed. Got: %q", res))
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}
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test2 := []byte{0, 1, 2, 3, 4, 5}
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if res := CompactEncode(test2); res != "\x00\x01\x23\x45" {
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t.Error(fmt.Sprintf("odd compact encode failed. Got: %q", res))
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}
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test3 := []byte{0, 15, 1, 12, 11, 8 /*term*/, 16}
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if res := CompactEncode(test3); res != "\x20\x0f\x1c\xb8" {
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t.Error(fmt.Sprintf("odd terminated compact encode failed. Got: %q", res))
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}
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test4 := []byte{15, 1, 12, 11, 8 /*term*/, 16}
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if res := CompactEncode(test4); res != "\x3f\x1c\xb8" {
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t.Error(fmt.Sprintf("even terminated compact encode failed. Got: %q", res))
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}
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}
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func TestCompactHexDecode(t *testing.T) {
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exp := []byte{7, 6, 6, 5, 7, 2, 6, 2, 16}
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res := CompactHexDecode("verb")
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if !bytes.Equal(res, exp) {
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t.Error("Error compact hex decode. Expected", exp, "got", res)
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}
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}
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func TestCompactDecode(t *testing.T) {
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exp := []byte{1, 2, 3, 4, 5}
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res := CompactDecode("\x11\x23\x45")
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if !bytes.Equal(res, exp) {
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t.Error("odd compact decode. Expected", exp, "got", res)
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}
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exp = []byte{0, 1, 2, 3, 4, 5}
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res = CompactDecode("\x00\x01\x23\x45")
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if !bytes.Equal(res, exp) {
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t.Error("even compact decode. Expected", exp, "got", res)
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}
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exp = []byte{0, 15, 1, 12, 11, 8 /*term*/, 16}
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res = CompactDecode("\x20\x0f\x1c\xb8")
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if !bytes.Equal(res, exp) {
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t.Error("even terminated compact decode. Expected", exp, "got", res)
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}
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exp = []byte{15, 1, 12, 11, 8 /*term*/, 16}
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res = CompactDecode("\x3f\x1c\xb8")
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if !bytes.Equal(res, exp) {
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t.Error("even terminated compact decode. Expected", exp, "got", res)
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}
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}
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143
trie/iterator.go
Normal file
143
trie/iterator.go
Normal file
@ -0,0 +1,143 @@
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package trie
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import (
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"bytes"
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"github.com/ethereum/go-ethereum/ethutil"
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)
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type NodeType byte
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const (
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EmptyNode NodeType = iota
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BranchNode
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LeafNode
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ExtNode
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)
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func getType(node *ethutil.Value) NodeType {
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if node.Len() == 0 {
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return EmptyNode
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}
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if node.Len() == 2 {
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k := CompactDecode(node.Get(0).Str())
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if HasTerm(k) {
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return LeafNode
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}
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return ExtNode
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}
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return BranchNode
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}
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type Iterator struct {
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Path [][]byte
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trie *Trie
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Key []byte
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Value *ethutil.Value
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}
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func NewIterator(trie *Trie) *Iterator {
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return &Iterator{trie: trie}
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}
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func (self *Iterator) key(node *ethutil.Value, path [][]byte) []byte {
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switch getType(node) {
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case LeafNode:
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k := RemTerm(CompactDecode(node.Get(0).Str()))
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self.Path = append(path, k)
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self.Value = node.Get(1)
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return k
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case BranchNode:
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if node.Get(16).Len() > 0 {
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return []byte{16}
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}
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for i := byte(0); i < 16; i++ {
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o := self.key(self.trie.getNode(node.Get(int(i)).Raw()), append(path, []byte{i}))
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if o != nil {
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return append([]byte{i}, o...)
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}
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}
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case ExtNode:
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currKey := node.Get(0).Bytes()
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return self.key(self.trie.getNode(node.Get(1).Raw()), append(path, currKey))
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}
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return nil
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}
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func (self *Iterator) next(node *ethutil.Value, key []byte, path [][]byte) []byte {
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switch typ := getType(node); typ {
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case EmptyNode:
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return nil
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case BranchNode:
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if len(key) > 0 {
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subNode := self.trie.getNode(node.Get(int(key[0])).Raw())
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o := self.next(subNode, key[1:], append(path, key[:1]))
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if o != nil {
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return append([]byte{key[0]}, o...)
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}
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}
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var r byte = 0
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if len(key) > 0 {
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r = key[0] + 1
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}
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for i := r; i < 16; i++ {
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subNode := self.trie.getNode(node.Get(int(i)).Raw())
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o := self.key(subNode, append(path, []byte{i}))
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if o != nil {
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return append([]byte{i}, o...)
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}
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}
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case LeafNode, ExtNode:
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k := RemTerm(CompactDecode(node.Get(0).Str()))
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if typ == LeafNode {
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if bytes.Compare([]byte(k), []byte(key)) > 0 {
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self.Value = node.Get(1)
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self.Path = append(path, k)
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return k
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}
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} else {
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subNode := self.trie.getNode(node.Get(1).Raw())
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subKey := key[len(k):]
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var ret []byte
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if BeginsWith(key, k) {
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ret = self.next(subNode, subKey, append(path, k))
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} else if bytes.Compare(k, key[:len(k)]) > 0 {
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ret = self.key(node, append(path, k))
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} else {
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ret = nil
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}
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if ret != nil {
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return append(k, ret...)
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}
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}
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}
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return nil
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}
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// Get the next in keys
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func (self *Iterator) Next(key string) []byte {
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self.trie.mut.Lock()
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defer self.trie.mut.Unlock()
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k := RemTerm(CompactHexDecode(key))
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n := self.next(self.trie.getNode(self.trie.Root), k, nil)
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self.Key = []byte(DecodeCompact(n))
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return self.Key
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}
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53
trie/slice.go
Normal file
53
trie/slice.go
Normal file
@ -0,0 +1,53 @@
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package trie
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import (
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"bytes"
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"math"
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)
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// Helper function for comparing slices
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func CompareIntSlice(a, b []int) bool {
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if len(a) != len(b) {
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return false
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}
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for i, v := range a {
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if v != b[i] {
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return false
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}
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}
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return true
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}
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// Returns the amount of nibbles that match each other from 0 ...
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func MatchingNibbleLength(a, b []byte) int {
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var i, length = 0, int(math.Min(float64(len(a)), float64(len(b))))
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for i < length {
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if a[i] != b[i] {
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break
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}
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i++
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}
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return i
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}
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func HasTerm(s []byte) bool {
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return s[len(s)-1] == 16
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}
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func RemTerm(s []byte) []byte {
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if HasTerm(s) {
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return s[:len(s)-1]
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}
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return s
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}
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func BeginsWith(a, b []byte) bool {
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if len(b) > len(a) {
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return false
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}
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return bytes.Equal(a[:len(b)], b)
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}
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620
trie/trie.go
Normal file
620
trie/trie.go
Normal file
@ -0,0 +1,620 @@
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package trie
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import (
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"bytes"
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"fmt"
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"sync"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/ethutil"
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)
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func ParanoiaCheck(t1 *Trie) (bool, *Trie) {
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t2 := New(ethutil.Config.Db, "")
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t1.NewIterator().Each(func(key string, v *ethutil.Value) {
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t2.Update(key, v.Str())
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})
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a := ethutil.NewValue(t2.Root).Bytes()
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b := ethutil.NewValue(t1.Root).Bytes()
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return bytes.Compare(a, b) == 0, t2
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}
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func (s *Cache) Len() int {
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return len(s.nodes)
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}
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// TODO
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// A StateObject is an object that has a state root
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// This is goig to be the object for the second level caching (the caching of object which have a state such as contracts)
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type StateObject interface {
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State() *Trie
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Sync()
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Undo()
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}
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type Node struct {
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Key []byte
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Value *ethutil.Value
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Dirty bool
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}
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func NewNode(key []byte, val *ethutil.Value, dirty bool) *Node {
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return &Node{Key: key, Value: val, Dirty: dirty}
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}
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func (n *Node) Copy() *Node {
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return NewNode(n.Key, n.Value, n.Dirty)
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}
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type Cache struct {
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nodes map[string]*Node
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db ethutil.Database
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IsDirty bool
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}
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func NewCache(db ethutil.Database) *Cache {
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return &Cache{db: db, nodes: make(map[string]*Node)}
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}
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func (cache *Cache) PutValue(v interface{}, force bool) interface{} {
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value := ethutil.NewValue(v)
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enc := value.Encode()
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if len(enc) >= 32 || force {
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sha := crypto.Sha3(enc)
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cache.nodes[string(sha)] = NewNode(sha, value, true)
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cache.IsDirty = true
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return sha
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}
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return v
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}
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func (cache *Cache) Put(v interface{}) interface{} {
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return cache.PutValue(v, false)
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}
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func (cache *Cache) Get(key []byte) *ethutil.Value {
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// First check if the key is the cache
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if cache.nodes[string(key)] != nil {
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return cache.nodes[string(key)].Value
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}
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// Get the key of the database instead and cache it
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data, _ := cache.db.Get(key)
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// Create the cached value
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value := ethutil.NewValueFromBytes(data)
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defer func() {
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if r := recover(); r != nil {
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fmt.Println("RECOVER GET", cache, cache.nodes)
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panic("bye")
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}
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}()
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// Create caching node
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cache.nodes[string(key)] = NewNode(key, value, false)
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||||
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return value
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||||
}
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|
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func (cache *Cache) Delete(key []byte) {
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||||
delete(cache.nodes, string(key))
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||||
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||||
cache.db.Delete(key)
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}
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||||
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||||
func (cache *Cache) Commit() {
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||||
// Don't try to commit if it isn't dirty
|
||||
if !cache.IsDirty {
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||||
return
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}
|
||||
|
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for key, node := range cache.nodes {
|
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if node.Dirty {
|
||||
cache.db.Put([]byte(key), node.Value.Encode())
|
||||
node.Dirty = false
|
||||
}
|
||||
}
|
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cache.IsDirty = false
|
||||
|
||||
// If the nodes grows beyond the 200 entries we simple empty it
|
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// FIXME come up with something better
|
||||
if len(cache.nodes) > 200 {
|
||||
cache.nodes = make(map[string]*Node)
|
||||
}
|
||||
}
|
||||
|
||||
func (cache *Cache) Undo() {
|
||||
for key, node := range cache.nodes {
|
||||
if node.Dirty {
|
||||
delete(cache.nodes, key)
|
||||
}
|
||||
}
|
||||
cache.IsDirty = false
|
||||
}
|
||||
|
||||
// A (modified) Radix Trie implementation. The Trie implements
|
||||
// a caching mechanism and will used cached values if they are
|
||||
// present. If a node is not present in the cache it will try to
|
||||
// fetch it from the database and store the cached value.
|
||||
// Please note that the data isn't persisted unless `Sync` is
|
||||
// explicitly called.
|
||||
type Trie struct {
|
||||
mut sync.RWMutex
|
||||
prevRoot interface{}
|
||||
Root interface{}
|
||||
//db Database
|
||||
cache *Cache
|
||||
}
|
||||
|
||||
func copyRoot(root interface{}) interface{} {
|
||||
var prevRootCopy interface{}
|
||||
if b, ok := root.([]byte); ok {
|
||||
prevRootCopy = ethutil.CopyBytes(b)
|
||||
} else {
|
||||
prevRootCopy = root
|
||||
}
|
||||
|
||||
return prevRootCopy
|
||||
}
|
||||
|
||||
func New(db ethutil.Database, Root interface{}) *Trie {
|
||||
// Make absolute sure the root is copied
|
||||
r := copyRoot(Root)
|
||||
p := copyRoot(Root)
|
||||
|
||||
trie := &Trie{cache: NewCache(db), Root: r, prevRoot: p}
|
||||
trie.setRoot(Root)
|
||||
|
||||
return trie
|
||||
}
|
||||
|
||||
func (self *Trie) setRoot(root interface{}) {
|
||||
switch t := root.(type) {
|
||||
case string:
|
||||
if t == "" {
|
||||
root = crypto.Sha3([]byte(""))
|
||||
}
|
||||
self.Root = root
|
||||
case []byte:
|
||||
self.Root = root
|
||||
default:
|
||||
self.Root = self.cache.PutValue(root, true)
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Public (query) interface functions
|
||||
*/
|
||||
|
||||
func (t *Trie) Update(key, value string) {
|
||||
t.mut.Lock()
|
||||
defer t.mut.Unlock()
|
||||
|
||||
k := CompactHexDecode(key)
|
||||
|
||||
root := t.UpdateState(t.Root, k, value)
|
||||
t.setRoot(root)
|
||||
}
|
||||
|
||||
func (t *Trie) Get(key string) string {
|
||||
t.mut.Lock()
|
||||
defer t.mut.Unlock()
|
||||
|
||||
k := CompactHexDecode(key)
|
||||
c := ethutil.NewValue(t.getState(t.Root, k))
|
||||
|
||||
return c.Str()
|
||||
}
|
||||
|
||||
func (t *Trie) Delete(key string) {
|
||||
t.mut.Lock()
|
||||
defer t.mut.Unlock()
|
||||
|
||||
k := CompactHexDecode(key)
|
||||
|
||||
root := t.deleteState(t.Root, k)
|
||||
t.setRoot(root)
|
||||
}
|
||||
|
||||
func (self *Trie) GetRoot() []byte {
|
||||
switch self.Root.(type) {
|
||||
case string:
|
||||
return []byte(self.Root.(string))
|
||||
case []byte:
|
||||
return self.Root.([]byte)
|
||||
default:
|
||||
panic(fmt.Sprintf("invalid root type %T", self.Root))
|
||||
}
|
||||
}
|
||||
|
||||
// Simple compare function which creates a rlp value out of the evaluated objects
|
||||
func (t *Trie) Cmp(trie *Trie) bool {
|
||||
return ethutil.NewValue(t.Root).Cmp(ethutil.NewValue(trie.Root))
|
||||
}
|
||||
|
||||
// Returns a copy of this trie
|
||||
func (t *Trie) Copy() *Trie {
|
||||
trie := New(t.cache.db, t.Root)
|
||||
for key, node := range t.cache.nodes {
|
||||
trie.cache.nodes[key] = node.Copy()
|
||||
}
|
||||
|
||||
return trie
|
||||
}
|
||||
|
||||
// Save the cached value to the database.
|
||||
func (t *Trie) Sync() {
|
||||
t.cache.Commit()
|
||||
t.prevRoot = copyRoot(t.Root)
|
||||
}
|
||||
|
||||
func (t *Trie) Undo() {
|
||||
t.cache.Undo()
|
||||
t.Root = t.prevRoot
|
||||
}
|
||||
|
||||
func (t *Trie) Cache() *Cache {
|
||||
return t.cache
|
||||
}
|
||||
|
||||
func (t *Trie) getState(node interface{}, key []byte) interface{} {
|
||||
n := ethutil.NewValue(node)
|
||||
// Return the node if key is empty (= found)
|
||||
if len(key) == 0 || n.IsNil() || n.Len() == 0 {
|
||||
return node
|
||||
}
|
||||
|
||||
currentNode := t.getNode(node)
|
||||
length := currentNode.Len()
|
||||
|
||||
if length == 0 {
|
||||
return ""
|
||||
} else if length == 2 {
|
||||
// Decode the key
|
||||
k := CompactDecode(currentNode.Get(0).Str())
|
||||
v := currentNode.Get(1).Raw()
|
||||
|
||||
if len(key) >= len(k) && bytes.Equal(k, key[:len(k)]) { //CompareIntSlice(k, key[:len(k)]) {
|
||||
return t.getState(v, key[len(k):])
|
||||
} else {
|
||||
return ""
|
||||
}
|
||||
} else if length == 17 {
|
||||
return t.getState(currentNode.Get(int(key[0])).Raw(), key[1:])
|
||||
}
|
||||
|
||||
// It shouldn't come this far
|
||||
panic("unexpected return")
|
||||
}
|
||||
|
||||
func (t *Trie) getNode(node interface{}) *ethutil.Value {
|
||||
n := ethutil.NewValue(node)
|
||||
|
||||
if !n.Get(0).IsNil() {
|
||||
return n
|
||||
}
|
||||
|
||||
str := n.Str()
|
||||
if len(str) == 0 {
|
||||
return n
|
||||
} else if len(str) < 32 {
|
||||
return ethutil.NewValueFromBytes([]byte(str))
|
||||
}
|
||||
|
||||
data := t.cache.Get(n.Bytes())
|
||||
|
||||
return data
|
||||
}
|
||||
|
||||
func (t *Trie) UpdateState(node interface{}, key []byte, value string) interface{} {
|
||||
return t.InsertState(node, key, value)
|
||||
}
|
||||
|
||||
func (t *Trie) Put(node interface{}) interface{} {
|
||||
return t.cache.Put(node)
|
||||
|
||||
}
|
||||
|
||||
func EmptyStringSlice(l int) []interface{} {
|
||||
slice := make([]interface{}, l)
|
||||
for i := 0; i < l; i++ {
|
||||
slice[i] = ""
|
||||
}
|
||||
return slice
|
||||
}
|
||||
|
||||
func (t *Trie) InsertState(node interface{}, key []byte, value interface{}) interface{} {
|
||||
if len(key) == 0 {
|
||||
return value
|
||||
}
|
||||
|
||||
// New node
|
||||
n := ethutil.NewValue(node)
|
||||
if node == nil || n.Len() == 0 {
|
||||
newNode := []interface{}{CompactEncode(key), value}
|
||||
|
||||
return t.Put(newNode)
|
||||
}
|
||||
|
||||
currentNode := t.getNode(node)
|
||||
// Check for "special" 2 slice type node
|
||||
if currentNode.Len() == 2 {
|
||||
// Decode the key
|
||||
|
||||
k := CompactDecode(currentNode.Get(0).Str())
|
||||
v := currentNode.Get(1).Raw()
|
||||
|
||||
// Matching key pair (ie. there's already an object with this key)
|
||||
if bytes.Equal(k, key) { //CompareIntSlice(k, key) {
|
||||
newNode := []interface{}{CompactEncode(key), value}
|
||||
return t.Put(newNode)
|
||||
}
|
||||
|
||||
var newHash interface{}
|
||||
matchingLength := MatchingNibbleLength(key, k)
|
||||
if matchingLength == len(k) {
|
||||
// Insert the hash, creating a new node
|
||||
newHash = t.InsertState(v, key[matchingLength:], value)
|
||||
} else {
|
||||
// Expand the 2 length slice to a 17 length slice
|
||||
oldNode := t.InsertState("", k[matchingLength+1:], v)
|
||||
newNode := t.InsertState("", key[matchingLength+1:], value)
|
||||
// Create an expanded slice
|
||||
scaledSlice := EmptyStringSlice(17)
|
||||
// Set the copied and new node
|
||||
scaledSlice[k[matchingLength]] = oldNode
|
||||
scaledSlice[key[matchingLength]] = newNode
|
||||
|
||||
newHash = t.Put(scaledSlice)
|
||||
}
|
||||
|
||||
if matchingLength == 0 {
|
||||
// End of the chain, return
|
||||
return newHash
|
||||
} else {
|
||||
newNode := []interface{}{CompactEncode(key[:matchingLength]), newHash}
|
||||
return t.Put(newNode)
|
||||
}
|
||||
} else {
|
||||
|
||||
// Copy the current node over to the new node and replace the first nibble in the key
|
||||
newNode := EmptyStringSlice(17)
|
||||
|
||||
for i := 0; i < 17; i++ {
|
||||
cpy := currentNode.Get(i).Raw()
|
||||
if cpy != nil {
|
||||
newNode[i] = cpy
|
||||
}
|
||||
}
|
||||
|
||||
newNode[key[0]] = t.InsertState(currentNode.Get(int(key[0])).Raw(), key[1:], value)
|
||||
|
||||
return t.Put(newNode)
|
||||
}
|
||||
|
||||
panic("unexpected end")
|
||||
}
|
||||
|
||||
func (t *Trie) deleteState(node interface{}, key []byte) interface{} {
|
||||
if len(key) == 0 {
|
||||
return ""
|
||||
}
|
||||
|
||||
// New node
|
||||
n := ethutil.NewValue(node)
|
||||
//if node == nil || (n.Type() == reflect.String && (n.Str() == "" || n.Get(0).IsNil())) || n.Len() == 0 {
|
||||
if node == nil || n.Len() == 0 {
|
||||
//return nil
|
||||
//fmt.Printf("<empty ret> %x %d\n", n, len(n.Bytes()))
|
||||
|
||||
return ""
|
||||
}
|
||||
|
||||
currentNode := t.getNode(node)
|
||||
// Check for "special" 2 slice type node
|
||||
if currentNode.Len() == 2 {
|
||||
// Decode the key
|
||||
k := CompactDecode(currentNode.Get(0).Str())
|
||||
v := currentNode.Get(1).Raw()
|
||||
|
||||
// Matching key pair (ie. there's already an object with this key)
|
||||
if bytes.Equal(k, key) { //CompareIntSlice(k, key) {
|
||||
//fmt.Printf("<delete ret> %x\n", v)
|
||||
|
||||
return ""
|
||||
} else if bytes.Equal(key[:len(k)], k) { //CompareIntSlice(key[:len(k)], k) {
|
||||
hash := t.deleteState(v, key[len(k):])
|
||||
child := t.getNode(hash)
|
||||
|
||||
var newNode []interface{}
|
||||
if child.Len() == 2 {
|
||||
newKey := append(k, CompactDecode(child.Get(0).Str())...)
|
||||
newNode = []interface{}{CompactEncode(newKey), child.Get(1).Raw()}
|
||||
} else {
|
||||
newNode = []interface{}{currentNode.Get(0).Str(), hash}
|
||||
}
|
||||
|
||||
//fmt.Printf("%x\n", newNode)
|
||||
|
||||
return t.Put(newNode)
|
||||
} else {
|
||||
return node
|
||||
}
|
||||
} else {
|
||||
// Copy the current node over to the new node and replace the first nibble in the key
|
||||
n := EmptyStringSlice(17)
|
||||
var newNode []interface{}
|
||||
|
||||
for i := 0; i < 17; i++ {
|
||||
cpy := currentNode.Get(i).Raw()
|
||||
if cpy != nil {
|
||||
n[i] = cpy
|
||||
}
|
||||
}
|
||||
|
||||
n[key[0]] = t.deleteState(n[key[0]], key[1:])
|
||||
amount := -1
|
||||
for i := 0; i < 17; i++ {
|
||||
if n[i] != "" {
|
||||
if amount == -1 {
|
||||
amount = i
|
||||
} else {
|
||||
amount = -2
|
||||
}
|
||||
}
|
||||
}
|
||||
if amount == 16 {
|
||||
newNode = []interface{}{CompactEncode([]byte{16}), n[amount]}
|
||||
} else if amount >= 0 {
|
||||
child := t.getNode(n[amount])
|
||||
if child.Len() == 17 {
|
||||
newNode = []interface{}{CompactEncode([]byte{byte(amount)}), n[amount]}
|
||||
} else if child.Len() == 2 {
|
||||
key := append([]byte{byte(amount)}, CompactDecode(child.Get(0).Str())...)
|
||||
newNode = []interface{}{CompactEncode(key), child.Get(1).Str()}
|
||||
}
|
||||
|
||||
} else {
|
||||
newNode = n
|
||||
}
|
||||
|
||||
//fmt.Printf("%x\n", newNode)
|
||||
return t.Put(newNode)
|
||||
}
|
||||
|
||||
panic("unexpected return")
|
||||
}
|
||||
|
||||
type TrieIterator struct {
|
||||
trie *Trie
|
||||
key string
|
||||
value string
|
||||
|
||||
shas [][]byte
|
||||
values []string
|
||||
|
||||
lastNode []byte
|
||||
}
|
||||
|
||||
func (t *Trie) NewIterator() *TrieIterator {
|
||||
return &TrieIterator{trie: t}
|
||||
}
|
||||
|
||||
func (self *Trie) Iterator() *Iterator {
|
||||
return NewIterator(self)
|
||||
}
|
||||
|
||||
// Some time in the near future this will need refactoring :-)
|
||||
// XXX Note to self, IsSlice == inline node. Str == sha3 to node
|
||||
func (it *TrieIterator) workNode(currentNode *ethutil.Value) {
|
||||
if currentNode.Len() == 2 {
|
||||
k := CompactDecode(currentNode.Get(0).Str())
|
||||
|
||||
if currentNode.Get(1).Str() == "" {
|
||||
it.workNode(currentNode.Get(1))
|
||||
} else {
|
||||
if k[len(k)-1] == 16 {
|
||||
it.values = append(it.values, currentNode.Get(1).Str())
|
||||
} else {
|
||||
it.shas = append(it.shas, currentNode.Get(1).Bytes())
|
||||
it.getNode(currentNode.Get(1).Bytes())
|
||||
}
|
||||
}
|
||||
} else {
|
||||
for i := 0; i < currentNode.Len(); i++ {
|
||||
if i == 16 && currentNode.Get(i).Len() != 0 {
|
||||
it.values = append(it.values, currentNode.Get(i).Str())
|
||||
} else {
|
||||
if currentNode.Get(i).Str() == "" {
|
||||
it.workNode(currentNode.Get(i))
|
||||
} else {
|
||||
val := currentNode.Get(i).Str()
|
||||
if val != "" {
|
||||
it.shas = append(it.shas, currentNode.Get(1).Bytes())
|
||||
it.getNode([]byte(val))
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (it *TrieIterator) getNode(node []byte) {
|
||||
currentNode := it.trie.cache.Get(node)
|
||||
it.workNode(currentNode)
|
||||
}
|
||||
|
||||
func (it *TrieIterator) Collect() [][]byte {
|
||||
if it.trie.Root == "" {
|
||||
return nil
|
||||
}
|
||||
|
||||
it.getNode(ethutil.NewValue(it.trie.Root).Bytes())
|
||||
|
||||
return it.shas
|
||||
}
|
||||
|
||||
func (it *TrieIterator) Purge() int {
|
||||
shas := it.Collect()
|
||||
for _, sha := range shas {
|
||||
it.trie.cache.Delete(sha)
|
||||
}
|
||||
return len(it.values)
|
||||
}
|
||||
|
||||
func (it *TrieIterator) Key() string {
|
||||
return ""
|
||||
}
|
||||
|
||||
func (it *TrieIterator) Value() string {
|
||||
return ""
|
||||
}
|
||||
|
||||
type EachCallback func(key string, node *ethutil.Value)
|
||||
|
||||
func (it *TrieIterator) Each(cb EachCallback) {
|
||||
it.fetchNode(nil, ethutil.NewValue(it.trie.Root).Bytes(), cb)
|
||||
}
|
||||
|
||||
func (it *TrieIterator) fetchNode(key []byte, node []byte, cb EachCallback) {
|
||||
it.iterateNode(key, it.trie.cache.Get(node), cb)
|
||||
}
|
||||
|
||||
func (it *TrieIterator) iterateNode(key []byte, currentNode *ethutil.Value, cb EachCallback) {
|
||||
if currentNode.Len() == 2 {
|
||||
k := CompactDecode(currentNode.Get(0).Str())
|
||||
|
||||
pk := append(key, k...)
|
||||
if currentNode.Get(1).Len() != 0 && currentNode.Get(1).Str() == "" {
|
||||
it.iterateNode(pk, currentNode.Get(1), cb)
|
||||
} else {
|
||||
if k[len(k)-1] == 16 {
|
||||
cb(DecodeCompact(pk), currentNode.Get(1))
|
||||
} else {
|
||||
it.fetchNode(pk, currentNode.Get(1).Bytes(), cb)
|
||||
}
|
||||
}
|
||||
} else {
|
||||
for i := 0; i < currentNode.Len(); i++ {
|
||||
pk := append(key, byte(i))
|
||||
if i == 16 && currentNode.Get(i).Len() != 0 {
|
||||
cb(DecodeCompact(pk), currentNode.Get(i))
|
||||
} else {
|
||||
if currentNode.Get(i).Len() != 0 && currentNode.Get(i).Str() == "" {
|
||||
it.iterateNode(pk, currentNode.Get(i), cb)
|
||||
} else {
|
||||
val := currentNode.Get(i).Str()
|
||||
if val != "" {
|
||||
it.fetchNode(pk, []byte(val), cb)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
434
trie/trie_test.go
Normal file
434
trie/trie_test.go
Normal file
@ -0,0 +1,434 @@
|
||||
package trie
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"encoding/hex"
|
||||
"encoding/json"
|
||||
"fmt"
|
||||
"io/ioutil"
|
||||
"math/rand"
|
||||
"net/http"
|
||||
"reflect"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
"github.com/ethereum/go-ethereum/ethutil"
|
||||
)
|
||||
|
||||
const LONG_WORD = "1234567890abcdefghijklmnopqrstuvwxxzABCEFGHIJKLMNOPQRSTUVWXYZ"
|
||||
|
||||
type MemDatabase struct {
|
||||
db map[string][]byte
|
||||
}
|
||||
|
||||
func NewMemDatabase() (*MemDatabase, error) {
|
||||
db := &MemDatabase{db: make(map[string][]byte)}
|
||||
return db, nil
|
||||
}
|
||||
func (db *MemDatabase) Put(key []byte, value []byte) {
|
||||
db.db[string(key)] = value
|
||||
}
|
||||
func (db *MemDatabase) Get(key []byte) ([]byte, error) {
|
||||
return db.db[string(key)], nil
|
||||
}
|
||||
func (db *MemDatabase) Delete(key []byte) error {
|
||||
delete(db.db, string(key))
|
||||
return nil
|
||||
}
|
||||
func (db *MemDatabase) Print() {}
|
||||
func (db *MemDatabase) Close() {}
|
||||
func (db *MemDatabase) LastKnownTD() []byte { return nil }
|
||||
|
||||
func NewTrie() (*MemDatabase, *Trie) {
|
||||
db, _ := NewMemDatabase()
|
||||
return db, New(db, "")
|
||||
}
|
||||
|
||||
func TestTrieSync(t *testing.T) {
|
||||
db, trie := NewTrie()
|
||||
|
||||
trie.Update("dog", LONG_WORD)
|
||||
if len(db.db) != 0 {
|
||||
t.Error("Expected no data in database")
|
||||
}
|
||||
|
||||
trie.Sync()
|
||||
if len(db.db) == 0 {
|
||||
t.Error("Expected data to be persisted")
|
||||
}
|
||||
}
|
||||
|
||||
func TestTrieDirtyTracking(t *testing.T) {
|
||||
_, trie := NewTrie()
|
||||
trie.Update("dog", LONG_WORD)
|
||||
if !trie.cache.IsDirty {
|
||||
t.Error("Expected trie to be dirty")
|
||||
}
|
||||
|
||||
trie.Sync()
|
||||
if trie.cache.IsDirty {
|
||||
t.Error("Expected trie not to be dirty")
|
||||
}
|
||||
|
||||
trie.Update("test", LONG_WORD)
|
||||
trie.cache.Undo()
|
||||
if trie.cache.IsDirty {
|
||||
t.Error("Expected trie not to be dirty")
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
func TestTrieReset(t *testing.T) {
|
||||
_, trie := NewTrie()
|
||||
|
||||
trie.Update("cat", LONG_WORD)
|
||||
if len(trie.cache.nodes) == 0 {
|
||||
t.Error("Expected cached nodes")
|
||||
}
|
||||
|
||||
trie.cache.Undo()
|
||||
|
||||
if len(trie.cache.nodes) != 0 {
|
||||
t.Error("Expected no nodes after undo")
|
||||
}
|
||||
}
|
||||
|
||||
func TestTrieGet(t *testing.T) {
|
||||
_, trie := NewTrie()
|
||||
|
||||
trie.Update("cat", LONG_WORD)
|
||||
x := trie.Get("cat")
|
||||
if x != LONG_WORD {
|
||||
t.Error("expected %s, got %s", LONG_WORD, x)
|
||||
}
|
||||
}
|
||||
|
||||
func TestTrieUpdating(t *testing.T) {
|
||||
_, trie := NewTrie()
|
||||
trie.Update("cat", LONG_WORD)
|
||||
trie.Update("cat", LONG_WORD+"1")
|
||||
x := trie.Get("cat")
|
||||
if x != LONG_WORD+"1" {
|
||||
t.Error("expected %S, got %s", LONG_WORD+"1", x)
|
||||
}
|
||||
}
|
||||
|
||||
func TestTrieCmp(t *testing.T) {
|
||||
_, trie1 := NewTrie()
|
||||
_, trie2 := NewTrie()
|
||||
|
||||
trie1.Update("doge", LONG_WORD)
|
||||
trie2.Update("doge", LONG_WORD)
|
||||
if !trie1.Cmp(trie2) {
|
||||
t.Error("Expected tries to be equal")
|
||||
}
|
||||
|
||||
trie1.Update("dog", LONG_WORD)
|
||||
trie2.Update("cat", LONG_WORD)
|
||||
if trie1.Cmp(trie2) {
|
||||
t.Errorf("Expected tries not to be equal %x %x", trie1.Root, trie2.Root)
|
||||
}
|
||||
}
|
||||
|
||||
func TestTrieDelete(t *testing.T) {
|
||||
_, trie := NewTrie()
|
||||
trie.Update("cat", LONG_WORD)
|
||||
exp := trie.Root
|
||||
trie.Update("dog", LONG_WORD)
|
||||
trie.Delete("dog")
|
||||
if !reflect.DeepEqual(exp, trie.Root) {
|
||||
t.Errorf("Expected tries to be equal %x : %x", exp, trie.Root)
|
||||
}
|
||||
|
||||
trie.Update("dog", LONG_WORD)
|
||||
exp = trie.Root
|
||||
trie.Update("dude", LONG_WORD)
|
||||
trie.Delete("dude")
|
||||
if !reflect.DeepEqual(exp, trie.Root) {
|
||||
t.Errorf("Expected tries to be equal %x : %x", exp, trie.Root)
|
||||
}
|
||||
}
|
||||
|
||||
func TestTrieDeleteWithValue(t *testing.T) {
|
||||
_, trie := NewTrie()
|
||||
trie.Update("c", LONG_WORD)
|
||||
exp := trie.Root
|
||||
trie.Update("ca", LONG_WORD)
|
||||
trie.Update("cat", LONG_WORD)
|
||||
trie.Delete("ca")
|
||||
trie.Delete("cat")
|
||||
if !reflect.DeepEqual(exp, trie.Root) {
|
||||
t.Errorf("Expected tries to be equal %x : %x", exp, trie.Root)
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
func TestTriePurge(t *testing.T) {
|
||||
_, trie := NewTrie()
|
||||
trie.Update("c", LONG_WORD)
|
||||
trie.Update("ca", LONG_WORD)
|
||||
trie.Update("cat", LONG_WORD)
|
||||
|
||||
lenBefore := len(trie.cache.nodes)
|
||||
it := trie.NewIterator()
|
||||
if num := it.Purge(); num != 3 {
|
||||
t.Errorf("Expected purge to return 3, got %d", num)
|
||||
}
|
||||
|
||||
if lenBefore == len(trie.cache.nodes) {
|
||||
t.Errorf("Expected cached nodes to be deleted")
|
||||
}
|
||||
}
|
||||
|
||||
func h(str string) string {
|
||||
d, err := hex.DecodeString(str)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
|
||||
return string(d)
|
||||
}
|
||||
|
||||
func get(in string) (out string) {
|
||||
if len(in) > 2 && in[:2] == "0x" {
|
||||
out = h(in[2:])
|
||||
} else {
|
||||
out = in
|
||||
}
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
type Test struct {
|
||||
Name string
|
||||
In map[string]string
|
||||
Root string
|
||||
}
|
||||
|
||||
func CreateTest(name string, data []byte) (Test, error) {
|
||||
t := Test{Name: name}
|
||||
err := json.Unmarshal(data, &t)
|
||||
if err != nil {
|
||||
return Test{}, fmt.Errorf("%v", err)
|
||||
}
|
||||
|
||||
return t, nil
|
||||
}
|
||||
|
||||
func CreateTests(uri string, cb func(Test)) map[string]Test {
|
||||
resp, err := http.Get(uri)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
defer resp.Body.Close()
|
||||
|
||||
data, err := ioutil.ReadAll(resp.Body)
|
||||
|
||||
var objmap map[string]*json.RawMessage
|
||||
err = json.Unmarshal(data, &objmap)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
|
||||
tests := make(map[string]Test)
|
||||
for name, testData := range objmap {
|
||||
test, err := CreateTest(name, *testData)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
|
||||
if cb != nil {
|
||||
cb(test)
|
||||
}
|
||||
tests[name] = test
|
||||
}
|
||||
|
||||
return tests
|
||||
}
|
||||
|
||||
func RandomData() [][]string {
|
||||
data := [][]string{
|
||||
{"0x000000000000000000000000ec4f34c97e43fbb2816cfd95e388353c7181dab1", "0x4e616d6552656700000000000000000000000000000000000000000000000000"},
|
||||
{"0x0000000000000000000000000000000000000000000000000000000000000045", "0x22b224a1420a802ab51d326e29fa98e34c4f24ea"},
|
||||
{"0x0000000000000000000000000000000000000000000000000000000000000046", "0x67706c2076330000000000000000000000000000000000000000000000000000"},
|
||||
{"0x000000000000000000000000697c7b8c961b56f675d570498424ac8de1a918f6", "0x6f6f6f6820736f2067726561742c207265616c6c6c793f000000000000000000"},
|
||||
{"0x0000000000000000000000007ef9e639e2733cb34e4dfc576d4b23f72db776b2", "0x4655474156000000000000000000000000000000000000000000000000000000"},
|
||||
{"0x6f6f6f6820736f2067726561742c207265616c6c6c793f000000000000000000", "0x697c7b8c961b56f675d570498424ac8de1a918f6"},
|
||||
{"0x4655474156000000000000000000000000000000000000000000000000000000", "0x7ef9e639e2733cb34e4dfc576d4b23f72db776b2"},
|
||||
{"0x4e616d6552656700000000000000000000000000000000000000000000000000", "0xec4f34c97e43fbb2816cfd95e388353c7181dab1"},
|
||||
}
|
||||
|
||||
var c [][]string
|
||||
for len(data) != 0 {
|
||||
e := rand.Intn(len(data))
|
||||
c = append(c, data[e])
|
||||
|
||||
copy(data[e:], data[e+1:])
|
||||
data[len(data)-1] = nil
|
||||
data = data[:len(data)-1]
|
||||
}
|
||||
|
||||
return c
|
||||
}
|
||||
|
||||
const MaxTest = 1000
|
||||
|
||||
// This test insert data in random order and seeks to find indifferences between the different tries
|
||||
func TestRegression(t *testing.T) {
|
||||
rand.Seed(time.Now().Unix())
|
||||
|
||||
roots := make(map[string]int)
|
||||
for i := 0; i < MaxTest; i++ {
|
||||
_, trie := NewTrie()
|
||||
data := RandomData()
|
||||
|
||||
for _, test := range data {
|
||||
trie.Update(test[0], test[1])
|
||||
}
|
||||
trie.Delete("0x4e616d6552656700000000000000000000000000000000000000000000000000")
|
||||
|
||||
roots[string(trie.Root.([]byte))] += 1
|
||||
}
|
||||
|
||||
if len(roots) > 1 {
|
||||
for root, num := range roots {
|
||||
t.Errorf("%x => %d\n", root, num)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestDelete(t *testing.T) {
|
||||
_, trie := NewTrie()
|
||||
|
||||
trie.Update("a", "jeffreytestlongstring")
|
||||
trie.Update("aa", "otherstring")
|
||||
trie.Update("aaa", "othermorestring")
|
||||
trie.Update("aabbbbccc", "hithere")
|
||||
trie.Update("abbcccdd", "hstanoehutnaheoustnh")
|
||||
trie.Update("rnthaoeuabbcccdd", "hstanoehutnaheoustnh")
|
||||
trie.Update("rneuabbcccdd", "hstanoehutnaheoustnh")
|
||||
trie.Update("rneuabboeusntahoeucccdd", "hstanoehutnaheoustnh")
|
||||
trie.Update("rnxabboeusntahoeucccdd", "hstanoehutnaheoustnh")
|
||||
trie.Delete("aaboaestnuhbccc")
|
||||
trie.Delete("a")
|
||||
trie.Update("a", "nthaonethaosentuh")
|
||||
trie.Update("c", "shtaosntehua")
|
||||
trie.Delete("a")
|
||||
trie.Update("aaaa", "testmegood")
|
||||
|
||||
_, t2 := NewTrie()
|
||||
trie.NewIterator().Each(func(key string, v *ethutil.Value) {
|
||||
if key == "aaaa" {
|
||||
t2.Update(key, v.Str())
|
||||
} else {
|
||||
t2.Update(key, v.Str())
|
||||
}
|
||||
})
|
||||
|
||||
a := ethutil.NewValue(trie.Root).Bytes()
|
||||
b := ethutil.NewValue(t2.Root).Bytes()
|
||||
|
||||
if bytes.Compare(a, b) != 0 {
|
||||
t.Errorf("Expected %x and %x to be equal", a, b)
|
||||
}
|
||||
}
|
||||
|
||||
func TestTerminator(t *testing.T) {
|
||||
key := CompactDecode("hello")
|
||||
if !HasTerm(key) {
|
||||
t.Errorf("Expected %v to have a terminator", key)
|
||||
}
|
||||
}
|
||||
|
||||
func TestIt(t *testing.T) {
|
||||
_, trie := NewTrie()
|
||||
trie.Update("cat", "cat")
|
||||
trie.Update("doge", "doge")
|
||||
trie.Update("wallace", "wallace")
|
||||
it := trie.Iterator()
|
||||
|
||||
inputs := []struct {
|
||||
In, Out string
|
||||
}{
|
||||
{"", "cat"},
|
||||
{"bobo", "cat"},
|
||||
{"c", "cat"},
|
||||
{"car", "cat"},
|
||||
{"catering", "doge"},
|
||||
{"w", "wallace"},
|
||||
{"wallace123", ""},
|
||||
}
|
||||
|
||||
for _, test := range inputs {
|
||||
res := string(it.Next(test.In))
|
||||
if res != test.Out {
|
||||
t.Errorf(test.In, "failed. Got", res, "Expected", test.Out)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestBeginsWith(t *testing.T) {
|
||||
a := CompactDecode("hello")
|
||||
b := CompactDecode("hel")
|
||||
|
||||
if BeginsWith(a, b) {
|
||||
t.Errorf("Expected %x to begin with %x", a, b)
|
||||
}
|
||||
|
||||
if BeginsWith(b, a) {
|
||||
t.Errorf("Expected %x not to begin with %x", b, a)
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
func TestRndCase(t *testing.T) {
|
||||
_, trie := NewTrie()
|
||||
|
||||
data := []struct{ k, v string }{
|
||||
{"0000000000000000000000000000000000000000000000000000000000000001", "a07573657264617461000000000000000000000000000000000000000000000000"},
|
||||
{"0000000000000000000000000000000000000000000000000000000000000003", "8453bb5b31"},
|
||||
{"0000000000000000000000000000000000000000000000000000000000000004", "850218711a00"},
|
||||
{"0000000000000000000000000000000000000000000000000000000000000005", "9462d7705bd0b3ecbc51a8026a25597cb28a650c79"},
|
||||
{"0000000000000000000000000000000000000000000000000000000000000010", "947e70f9460402290a3e487dae01f610a1a8218fda"},
|
||||
{"0000000000000000000000000000000000000000000000000000000000000111", "01"},
|
||||
{"0000000000000000000000000000000000000000000000000000000000000112", "a053656e6174650000000000000000000000000000000000000000000000000000"},
|
||||
{"0000000000000000000000000000000000000000000000000000000000000113", "a053656e6174650000000000000000000000000000000000000000000000000000"},
|
||||
{"53656e6174650000000000000000000000000000000000000000000000000000", "94977e3f62f5e1ed7953697430303a3cfa2b5b736e"},
|
||||
}
|
||||
for _, e := range data {
|
||||
trie.Update(string(ethutil.Hex2Bytes(e.k)), string(ethutil.Hex2Bytes(e.v)))
|
||||
}
|
||||
|
||||
fmt.Printf("root after update %x\n", trie.Root)
|
||||
trie.NewIterator().Each(func(k string, v *ethutil.Value) {
|
||||
fmt.Printf("%x %x\n", k, v.Bytes())
|
||||
})
|
||||
|
||||
data = []struct{ k, v string }{
|
||||
{"0000000000000000000000000000000000000000000000000000000000000112", ""},
|
||||
{"436974697a656e73000000000000000000000000000000000000000000000001", ""},
|
||||
{"436f757274000000000000000000000000000000000000000000000000000002", ""},
|
||||
{"53656e6174650000000000000000000000000000000000000000000000000000", ""},
|
||||
{"436f757274000000000000000000000000000000000000000000000000000000", ""},
|
||||
{"53656e6174650000000000000000000000000000000000000000000000000001", ""},
|
||||
{"0000000000000000000000000000000000000000000000000000000000000113", ""},
|
||||
{"436974697a656e73000000000000000000000000000000000000000000000000", ""},
|
||||
{"436974697a656e73000000000000000000000000000000000000000000000002", ""},
|
||||
{"436f757274000000000000000000000000000000000000000000000000000001", ""},
|
||||
{"0000000000000000000000000000000000000000000000000000000000000111", ""},
|
||||
{"53656e6174650000000000000000000000000000000000000000000000000002", ""},
|
||||
}
|
||||
|
||||
for _, e := range data {
|
||||
trie.Delete(string(ethutil.Hex2Bytes(e.k)))
|
||||
}
|
||||
|
||||
fmt.Printf("root after delete %x\n", trie.Root)
|
||||
|
||||
trie.NewIterator().Each(func(k string, v *ethutil.Value) {
|
||||
fmt.Printf("%x %x\n", k, v.Bytes())
|
||||
})
|
||||
|
||||
fmt.Printf("%x\n", trie.Get(string(ethutil.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))))
|
||||
}
|
||||
*/
|
||||
Reference in New Issue
Block a user