From 707d413761927f5ad95298e666e297b820ad0901 Mon Sep 17 00:00:00 2001
From: zelig <viktor.tron@gmail.com>
Date: Sun, 29 Jun 2014 16:26:58 +0100
Subject: refactor ethutil/trie to ethtrie
---
ethtrie/encoding.go | 76 +++++++
ethtrie/encoding_test.go | 67 ++++++
ethtrie/slice.go | 26 +++
ethtrie/trie.go | 563 +++++++++++++++++++++++++++++++++++++++++++++++
ethtrie/trie_test.go | 193 ++++++++++++++++
5 files changed, 925 insertions(+)
create mode 100644 ethtrie/encoding.go
create mode 100644 ethtrie/encoding_test.go
create mode 100644 ethtrie/slice.go
create mode 100644 ethtrie/trie.go
create mode 100644 ethtrie/trie_test.go
(limited to 'ethtrie')
diff --git a/ethtrie/encoding.go b/ethtrie/encoding.go
new file mode 100644
index 000000000..c9c391110
--- /dev/null
+++ b/ethtrie/encoding.go
@@ -0,0 +1,76 @@
+package ethtrie
+
+import (
+ "bytes"
+ "encoding/hex"
+ "strings"
+)
+
+func CompactEncode(hexSlice []int) string {
+ terminator := 0
+ if hexSlice[len(hexSlice)-1] == 16 {
+ terminator = 1
+ }
+
+ if terminator == 1 {
+ hexSlice = hexSlice[:len(hexSlice)-1]
+ }
+
+ oddlen := len(hexSlice) % 2
+ flags := 2*terminator + oddlen
+ if oddlen != 0 {
+ hexSlice = append([]int{flags}, hexSlice...)
+ } else {
+ hexSlice = append([]int{flags, 0}, hexSlice...)
+ }
+
+ var buff bytes.Buffer
+ for i := 0; i < len(hexSlice); i += 2 {
+ buff.WriteByte(byte(16*hexSlice[i] + hexSlice[i+1]))
+ }
+
+ return buff.String()
+}
+
+func CompactDecode(str string) []int {
+ base := CompactHexDecode(str)
+ base = base[:len(base)-1]
+ if base[0] >= 2 {
+ base = append(base, 16)
+ }
+ if base[0]%2 == 1 {
+ base = base[1:]
+ } else {
+ base = base[2:]
+ }
+
+ return base
+}
+
+func CompactHexDecode(str string) []int {
+ base := "0123456789abcdef"
+ hexSlice := make([]int, 0)
+
+ enc := hex.EncodeToString([]byte(str))
+ for _, v := range enc {
+ hexSlice = append(hexSlice, strings.IndexByte(base, byte(v)))
+ }
+ hexSlice = append(hexSlice, 16)
+
+ return hexSlice
+}
+
+func DecodeCompact(key []int) string {
+ base := "0123456789abcdef"
+ var str string
+
+ for _, v := range key {
+ if v < 16 {
+ str += string(base[v])
+ }
+ }
+
+ res, _ := hex.DecodeString(str)
+
+ return string(res)
+}
diff --git a/ethtrie/encoding_test.go b/ethtrie/encoding_test.go
new file mode 100644
index 000000000..7a4849678
--- /dev/null
+++ b/ethtrie/encoding_test.go
@@ -0,0 +1,67 @@
+package ethtrie
+
+import (
+ "fmt"
+ "testing"
+)
+
+func TestCompactEncode(t *testing.T) {
+ test1 := []int{1, 2, 3, 4, 5}
+ if res := CompactEncode(test1); res != "\x11\x23\x45" {
+ t.Error(fmt.Sprintf("even compact encode failed. Got: %q", res))
+ }
+
+ test2 := []int{0, 1, 2, 3, 4, 5}
+ if res := CompactEncode(test2); res != "\x00\x01\x23\x45" {
+ t.Error(fmt.Sprintf("odd compact encode failed. Got: %q", res))
+ }
+
+ test3 := []int{0, 15, 1, 12, 11, 8 /*term*/, 16}
+ if res := CompactEncode(test3); res != "\x20\x0f\x1c\xb8" {
+ t.Error(fmt.Sprintf("odd terminated compact encode failed. Got: %q", res))
+ }
+
+ test4 := []int{15, 1, 12, 11, 8 /*term*/, 16}
+ if res := CompactEncode(test4); res != "\x3f\x1c\xb8" {
+ t.Error(fmt.Sprintf("even terminated compact encode failed. Got: %q", res))
+ }
+}
+
+func TestCompactHexDecode(t *testing.T) {
+ exp := []int{7, 6, 6, 5, 7, 2, 6, 2, 16}
+ res := CompactHexDecode("verb")
+
+ if !CompareIntSlice(res, exp) {
+ t.Error("Error compact hex decode. Expected", exp, "got", res)
+ }
+}
+
+func TestCompactDecode(t *testing.T) {
+ exp := []int{1, 2, 3, 4, 5}
+ res := CompactDecode("\x11\x23\x45")
+
+ if !CompareIntSlice(res, exp) {
+ t.Error("odd compact decode. Expected", exp, "got", res)
+ }
+
+ exp = []int{0, 1, 2, 3, 4, 5}
+ res = CompactDecode("\x00\x01\x23\x45")
+
+ if !CompareIntSlice(res, exp) {
+ t.Error("even compact decode. Expected", exp, "got", res)
+ }
+
+ exp = []int{0, 15, 1, 12, 11, 8 /*term*/, 16}
+ res = CompactDecode("\x20\x0f\x1c\xb8")
+
+ if !CompareIntSlice(res, exp) {
+ t.Error("even terminated compact decode. Expected", exp, "got", res)
+ }
+
+ exp = []int{15, 1, 12, 11, 8 /*term*/, 16}
+ res = CompactDecode("\x3f\x1c\xb8")
+
+ if !CompareIntSlice(res, exp) {
+ t.Error("even terminated compact decode. Expected", exp, "got", res)
+ }
+}
diff --git a/ethtrie/slice.go b/ethtrie/slice.go
new file mode 100644
index 000000000..b9d5d1285
--- /dev/null
+++ b/ethtrie/slice.go
@@ -0,0 +1,26 @@
+package ethtrie
+
+import ()
+
+// Helper function for comparing slices
+func CompareIntSlice(a, b []int) bool {
+ if len(a) != len(b) {
+ return false
+ }
+ for i, v := range a {
+ if v != b[i] {
+ return false
+ }
+ }
+ return true
+}
+
+// Returns the amount of nibbles that match each other from 0 ...
+func MatchingNibbleLength(a, b []int) int {
+ i := 0
+ for CompareIntSlice(a[:i+1], b[:i+1]) && i < len(b) {
+ i += 1
+ }
+
+ return i
+}
diff --git a/ethtrie/trie.go b/ethtrie/trie.go
new file mode 100644
index 000000000..c957e9b4c
--- /dev/null
+++ b/ethtrie/trie.go
@@ -0,0 +1,563 @@
+package ethtrie
+
+import (
+ "fmt"
+ "github.com/ethereum/eth-go/ethcrypto"
+ "github.com/ethereum/eth-go/ethutil"
+ "reflect"
+ "sync"
+)
+
+func (s *Cache) Len() int {
+ return len(s.nodes)
+}
+
+// TODO
+// A StateObject is an object that has a state root
+// This is goig to be the object for the second level caching (the caching of object which have a state such as contracts)
+type StateObject interface {
+ State() *Trie
+ Sync()
+ Undo()
+}
+
+type Node struct {
+ Key []byte
+ Value *ethutil.Value
+ Dirty bool
+}
+
+func NewNode(key []byte, val *ethutil.Value, dirty bool) *Node {
+ return &Node{Key: key, Value: val, Dirty: dirty}
+}
+
+func (n *Node) Copy() *Node {
+ return NewNode(n.Key, n.Value, n.Dirty)
+}
+
+type Cache struct {
+ nodes map[string]*Node
+ db ethutil.Database
+ IsDirty bool
+}
+
+func NewCache(db ethutil.Database) *Cache {
+ return &Cache{db: db, nodes: make(map[string]*Node)}
+}
+
+func (cache *Cache) Put(v interface{}) interface{} {
+ value := ethutil.NewValue(v)
+
+ enc := value.Encode()
+ if len(enc) >= 32 {
+ sha := ethcrypto.Sha3Bin(enc)
+
+ cache.nodes[string(sha)] = NewNode(sha, value, true)
+ cache.IsDirty = true
+
+ return sha
+ }
+
+ return v
+}
+
+func (cache *Cache) Get(key []byte) *ethutil.Value {
+ // First check if the key is the cache
+ if cache.nodes[string(key)] != nil {
+ return cache.nodes[string(key)].Value
+ }
+
+ // Get the key of the database instead and cache it
+ data, _ := cache.db.Get(key)
+ // Create the cached value
+ value := ethutil.NewValueFromBytes(data)
+ // Create caching node
+ cache.nodes[string(key)] = NewNode(key, value, false)
+
+ return value
+}
+
+func (cache *Cache) Delete(key []byte) {
+ delete(cache.nodes, string(key))
+
+ cache.db.Delete(key)
+}
+
+func (cache *Cache) Commit() {
+ // Don't try to commit if it isn't dirty
+ if !cache.IsDirty {
+ return
+ }
+
+ for key, node := range cache.nodes {
+ if node.Dirty {
+ cache.db.Put([]byte(key), node.Value.Encode())
+ node.Dirty = false
+ }
+ }
+ cache.IsDirty = false
+
+ // If the nodes grows beyond the 200 entries we simple empty it
+ // 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 NewTrie(db ethutil.Database, Root interface{}) *Trie {
+ // Make absolute sure the root is copied
+ r := copyRoot(Root)
+ p := copyRoot(Root)
+
+ return &Trie{cache: NewCache(db), Root: r, prevRoot: p}
+}
+
+// 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
+}
+
+/*
+ * Public (query) interface functions
+ */
+func (t *Trie) Update(key string, value string) {
+ t.mut.Lock()
+ defer t.mut.Unlock()
+
+ k := CompactHexDecode(key)
+
+ t.Root = t.UpdateState(t.Root, k, value)
+}
+
+func (t *Trie) Get(key string) string {
+ t.mut.RLock()
+ defer t.mut.RUnlock()
+
+ k := CompactHexDecode(key)
+ c := ethutil.NewValue(t.GetState(t.Root, k))
+
+ return c.Str()
+}
+
+func (t *Trie) Delete(key string) {
+ t.Update(key, "")
+}
+
+func (t *Trie) GetState(node interface{}, key []int) 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) && CompareIntSlice(k, key[:len(k)]) {
+ return t.GetState(v, key[len(k):])
+ } else {
+ return ""
+ }
+ } else if length == 17 {
+ return t.GetState(currentNode.Get(key[0]).Raw(), key[1:])
+ }
+
+ // It shouldn't come this far
+ fmt.Println("GetState unexpected return")
+ 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))
+ }
+
+ return t.cache.Get(n.Bytes())
+}
+
+func (t *Trie) UpdateState(node interface{}, key []int, value string) interface{} {
+
+ if value != "" {
+ return t.InsertState(node, key, value)
+ } else {
+ // delete it
+ return t.DeleteState(node, key)
+ }
+
+ return t.Root
+}
+
+func (t *Trie) Put(node interface{}) interface{} {
+ /*
+ TODO?
+ c := Conv(t.Root)
+ fmt.Println(c.Type(), c.Length())
+ if c.Type() == reflect.String && c.AsString() == "" {
+ return enc
+ }
+ */
+
+ 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 []int, value interface{}) interface{} {
+ if len(key) == 0 {
+ return value
+ }
+
+ // New node
+ n := ethutil.NewValue(node)
+ if node == nil || (n.Type() == reflect.String && (n.Str() == "" || n.Get(0).IsNil())) || 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 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(key[0]).Raw(), key[1:], value)
+
+ return t.Put(newNode)
+ }
+
+ return ""
+}
+
+func (t *Trie) DeleteState(node interface{}, key []int) 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 {
+ 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 CompareIntSlice(k, key) {
+ return ""
+ } else if 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}
+ }
+
+ 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([]int{16}), n[amount]}
+ } else if amount >= 0 {
+ child := t.GetNode(n[amount])
+ if child.Len() == 17 {
+ newNode = []interface{}{CompactEncode([]int{amount}), n[amount]}
+ } else if child.Len() == 2 {
+ key := append([]int{amount}, CompactDecode(child.Get(0).Str())...)
+ newNode = []interface{}{CompactEncode(key), child.Get(1).Str()}
+ }
+
+ } else {
+ newNode = n
+ }
+
+ return t.Put(newNode)
+ }
+
+ return ""
+}
+
+// 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 := NewTrie(t.cache.db, t.Root)
+ for key, node := range t.cache.nodes {
+ trie.cache.nodes[key] = node.Copy()
+ }
+
+ return trie
+}
+
+type TrieIterator struct {
+ trie *Trie
+ key string
+ value string
+
+ shas [][]byte
+ values []string
+
+ lastNode []byte
+}
+
+func (t *Trie) NewIterator() *TrieIterator {
+ return &TrieIterator{trie: t}
+}
+
+// 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 []int, node []byte, cb EachCallback) {
+ it.iterateNode(key, it.trie.cache.Get(node), cb)
+}
+
+func (it *TrieIterator) iterateNode(key []int, currentNode *ethutil.Value, cb EachCallback) {
+ if currentNode.Len() == 2 {
+ k := CompactDecode(currentNode.Get(0).Str())
+
+ if currentNode.Get(1).Str() == "" {
+ it.iterateNode(key, currentNode.Get(1), cb)
+ } else {
+ pk := append(key, k...)
+
+ 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, i)
+ if i == 16 && currentNode.Get(i).Len() != 0 {
+ cb(DecodeCompact(pk), currentNode.Get(i))
+ } else {
+ if 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)
+ }
+ }
+ }
+ }
+ }
+}
diff --git a/ethtrie/trie_test.go b/ethtrie/trie_test.go
new file mode 100644
index 000000000..284b189cb
--- /dev/null
+++ b/ethtrie/trie_test.go
@@ -0,0 +1,193 @@
+package ethtrie
+
+import (
+ "fmt"
+ "reflect"
+ "testing"
+)
+
+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 New() (*MemDatabase, *Trie) {
+ db, _ := NewMemDatabase()
+ return db, NewTrie(db, "")
+}
+
+func TestTrieSync(t *testing.T) {
+ db, trie := New()
+
+ 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 := New()
+ 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 := New()
+
+ 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 := New()
+
+ 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 := New()
+ 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 := New()
+ _, trie2 := New()
+
+ 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 := New()
+ 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 := New()
+ 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 := New()
+ 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 TestTrieIt(t *testing.T) {
+ _, trie := New()
+
+ data := [][]string{
+ {"do", "verb"},
+ {"ether", "wookiedoo"},
+ {"horse", "stallion"},
+ {"shaman", "horse"},
+ {"doge", "coin"},
+ {"ether", ""},
+ {"dog", "puppy"},
+ {"shaman", ""},
+ }
+
+ for _, item := range data {
+ trie.Update(item[0], item[1])
+ }
+
+ fmt.Printf("root %x", trie.Root)
+}
--
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