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129 lines
2.2 KiB
129 lines
2.2 KiB
package merkle
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const HASH_BYTE_SIZE int = 4 + 32
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/*
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Immutable AVL Tree (wraps the Node root)
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This tree is not concurrency safe.
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You must wrap your calls with your own mutex.
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*/
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type IAVLTree struct {
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db Db
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root *IAVLNode
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}
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func NewIAVLTree(db Db) *IAVLTree {
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return &IAVLTree{
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db: db,
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root: nil,
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}
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}
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// TODO rename to Load.
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func NewIAVLTreeFromHash(db Db, hash []byte) *IAVLTree {
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root := &IAVLNode{
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hash: hash,
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flags: IAVLNODE_FLAG_PERSISTED | IAVLNODE_FLAG_PLACEHOLDER,
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}
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root.fill(db)
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return &IAVLTree{db: db, root: root}
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}
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func NewIAVLTreeFromKey(db Db, key string) *IAVLTree {
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hash := db.Get([]byte(key))
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if hash == nil {
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return nil
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}
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root := &IAVLNode{
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hash: hash,
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flags: IAVLNODE_FLAG_PERSISTED | IAVLNODE_FLAG_PLACEHOLDER,
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}
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root.fill(db)
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return &IAVLTree{db: db, root: root}
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}
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func (t *IAVLTree) Size() uint64 {
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if t.root == nil {
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return 0
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}
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return t.root.Size()
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}
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func (t *IAVLTree) Height() uint8 {
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if t.root == nil {
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return 0
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}
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return t.root.Height()
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}
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func (t *IAVLTree) Has(key []byte) bool {
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if t.root == nil {
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return false
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}
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return t.root.has(t.db, key)
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}
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func (t *IAVLTree) Set(key []byte, value []byte) (updated bool) {
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if t.root == nil {
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t.root = NewIAVLNode(key, value)
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return false
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}
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t.root, updated = t.root.set(t.db, key, value)
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return updated
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}
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func (t *IAVLTree) Hash() []byte {
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if t.root == nil {
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return nil
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}
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hash, _ := t.root.HashWithCount()
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return hash
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}
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func (t *IAVLTree) HashWithCount() ([]byte, uint64) {
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if t.root == nil {
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return nil, 0
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}
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return t.root.HashWithCount()
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}
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func (t *IAVLTree) Save() {
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if t.root == nil {
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return
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}
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t.root.HashWithCount()
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t.root.Save(t.db)
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}
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func (t *IAVLTree) SaveKey(key string) {
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if t.root == nil {
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return
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}
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hash, _ := t.root.HashWithCount()
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t.root.Save(t.db)
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t.db.Set([]byte(key), hash)
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}
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func (t *IAVLTree) Get(key []byte) (value []byte) {
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if t.root == nil {
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return nil
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}
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return t.root.get(t.db, key)
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}
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func (t *IAVLTree) Remove(key []byte) (value []byte, err error) {
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if t.root == nil {
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return nil, NotFound(key)
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}
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newRoot, _, value, err := t.root.remove(t.db, key)
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if err != nil {
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return nil, err
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}
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t.root = newRoot
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return value, nil
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}
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func (t *IAVLTree) Copy() Tree {
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return &IAVLTree{db: t.db, root: t.root}
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}
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