IAVLTree supports Codec.

binary/codec.go

@@ -2,16 +2,17 @@ package binary
 
 import (
 	"bytes"
+	"io"
 	"time"
 )
 
 type Codec interface {
-	Write(interface{}) ([]byte, error)
+	Encode(o interface{}, w io.Writer, n *int64, err *error)
-	Read([]byte) (interface{}, error)
+	Decode(r io.Reader, n *int64, err *error) interface{}
+	Compare(o1 interface{}, o2 interface{}) int
 }
 
 const (
-	typeNil  = byte(0x00)
 	typeByte = byte(0x01)
 	typeInt8 = byte(0x02)
 	// typeUInt8     = byte(0x03)
@@ -21,6 +22,8 @@ const (
 	typeUInt32    = byte(0x07)
 	typeInt64     = byte(0x08)
 	typeUInt64    = byte(0x09)
+	typeVarInt    = byte(0x0A)
+	typeUVarInt   = byte(0x0B)
 	typeString    = byte(0x10)
 	typeByteSlice = byte(0x11)
 	typeTime      = byte(0x20)
@@ -30,11 +33,10 @@ var BasicCodec = basicCodec{}
 
 type basicCodec struct{}
 
-func (bc basicCodec) Write(o interface{}) ([]byte, error) {
+func (bc basicCodec) Encode(o interface{}, w io.Writer, n *int64, err *error) {
-	n, err, w := new(int64), new(error), new(bytes.Buffer)
 	switch o.(type) {
 	case nil:
-		WriteByte(w, typeNil, n, err)
+		panic("nil type unsupported")
 	case byte:
 		WriteByte(w, typeByte, n, err)
 		WriteByte(w, o.(byte), n, err)
@@ -62,6 +64,12 @@ func (bc basicCodec) Write(o interface{}) ([]byte, error) {
 	case uint64:
 		WriteByte(w, typeUInt64, n, err)
 		WriteUInt64(w, o.(uint64), n, err)
+	case int:
+		WriteByte(w, typeVarInt, n, err)
+		WriteVarInt(w, o.(int), n, err)
+	case uint:
+		WriteByte(w, typeUVarInt, n, err)
+		WriteUVarInt(w, o.(uint), n, err)
 	case string:
 		WriteByte(w, typeString, n, err)
 		WriteString(w, o.(string), n, err)
@@ -74,15 +82,11 @@ func (bc basicCodec) Write(o interface{}) ([]byte, error) {
 	default:
 		panic("Unsupported type")
 	}
-	return w.Bytes(), *err
 }
 
-func (bc basicCodec) Read(bz []byte) (interface{}, error) {
+func (bc basicCodec) Decode(r io.Reader, n *int64, err *error) (o interface{}) {
-	n, err, r, o := new(int64), new(error), bytes.NewBuffer(bz), interface{}(nil)
 	type_ := ReadByte(r, n, err)
 	switch type_ {
-	case typeNil:
-		o = nil
 	case typeByte:
 		o = ReadByte(r, n, err)
 	case typeInt8:
@@ -101,6 +105,10 @@ func (bc basicCodec) Read(bz []byte) (interface{}, error) {
 		o = ReadInt64(r, n, err)
 	case typeUInt64:
 		o = ReadUInt64(r, n, err)
+	case typeVarInt:
+		o = ReadVarInt(r, n, err)
+	case typeUVarInt:
+		o = ReadUVarInt(r, n, err)
 	case typeString:
 		o = ReadString(r, n, err)
 	case typeByteSlice:
@@ -110,5 +118,39 @@ func (bc basicCodec) Read(bz []byte) (interface{}, error) {
 	default:
 		panic("Unsupported type")
 	}
-	return o, *err
+	return o
+}
+
+func (bc basicCodec) Compare(o1 interface{}, o2 interface{}) int {
+	switch o1.(type) {
+	case byte:
+		return int(o1.(byte) - o2.(byte))
+	case int8:
+		return int(o1.(int8) - o2.(int8))
+	//case uint8:
+	case int16:
+		return int(o1.(int16) - o2.(int16))
+	case uint16:
+		return int(o1.(uint16) - o2.(uint16))
+	case int32:
+		return int(o1.(int32) - o2.(int32))
+	case uint32:
+		return int(o1.(uint32) - o2.(uint32))
+	case int64:
+		return int(o1.(int64) - o2.(int64))
+	case uint64:
+		return int(o1.(uint64) - o2.(uint64))
+	case int:
+		return o1.(int) - o2.(int)
+	case uint:
+		return int(o1.(uint)) - int(o2.(uint))
+	case string:
+		return bytes.Compare([]byte(o1.(string)), []byte(o2.(string)))
+	case []byte:
+		return bytes.Compare(o1.([]byte), o2.([]byte))
+	case time.Time:
+		return int(o1.(time.Time).UnixNano() - o2.(time.Time).UnixNano())
+	default:
+		panic("Unsupported type")
+	}
 }

binary/int.go

@@ -158,34 +158,34 @@ func ReadUInt64(r io.Reader, n *int64, err *error) uint64 {
 
 // VarInt
 
-func WriteVarInt(w io.Writer, i int64, n *int64, err *error) {
+func WriteVarInt(w io.Writer, i int, n *int64, err *error) {
 	buf := make([]byte, 9)
 	n_ := int64(binary.PutVarint(buf, int64(i)))
 	*n += n_
 	WriteTo(w, buf[:n_], n, err)
 }
 
-func ReadVarInt(r io.Reader, n *int64, err *error) int64 {
+func ReadVarInt(r io.Reader, n *int64, err *error) int {
 	res, n_, err_ := readVarint(r)
 	*n += n_
 	*err = err_
-	return res
+	return int(res)
 }
 
 // UVarInt
 
-func WriteUVarInt(w io.Writer, i uint64, n *int64, err *error) {
+func WriteUVarInt(w io.Writer, i uint, n *int64, err *error) {
 	buf := make([]byte, 9)
 	n_ := int64(binary.PutUvarint(buf, uint64(i)))
 	*n += n_
 	WriteTo(w, buf[:n_], n, err)
 }
 
-func ReadUVarInt(r io.Reader, n *int64, err *error) uint64 {
+func ReadUVarInt(r io.Reader, n *int64, err *error) uint {
 	res, n_, err_ := readUvarint(r)
 	*n += n_
 	*err = err_
-	return res
+	return uint(res)
 }
 
 //-----------------------------------------------------------------------------

merkle/iavl_node.go

@@ -1,7 +1,6 @@
 package merkle
 
 import (
-	"bytes"
 	"crypto/sha256"
 	. "github.com/tendermint/tendermint/binary"
 	"io"
@@ -10,8 +9,8 @@ import (
 // Node
 
 type IAVLNode struct {
-	key       []byte
+	key       interface{}
-	value     []byte
+	value     interface{}
 	size      uint64
 	height    uint8
 	hash      []byte
@@ -22,7 +21,7 @@ type IAVLNode struct {
 	persisted bool
 }
 
-func NewIAVLNode(key []byte, value []byte) *IAVLNode {
+func NewIAVLNode(key interface{}, value interface{}) *IAVLNode {
 	return &IAVLNode{
 		key:   key,
 		value: value,
@@ -30,20 +29,20 @@ func NewIAVLNode(key []byte, value []byte) *IAVLNode {
 	}
 }
 
-func ReadIAVLNode(r io.Reader, n *int64, err *error) *IAVLNode {
+func ReadIAVLNode(t *IAVLTree, r io.Reader, n *int64, err *error) *IAVLNode {
 	node := &IAVLNode{}
 
 	// node header & key
 	node.height = ReadUInt8(r, n, err)
 	node.size = ReadUInt64(r, n, err)
-	node.key = ReadByteSlice(r, n, err)
+	node.key = t.keyCodec.Decode(r, n, err)
 	if *err != nil {
 		panic(*err)
 	}
 
 	// node value or children.
 	if node.height == 0 {
-		node.value = ReadByteSlice(r, n, err)
+		node.value = t.valueCodec.Decode(r, n, err)
 	} else {
 		node.leftHash = ReadByteSlice(r, n, err)
 		node.rightHash = ReadByteSlice(r, n, err)
@@ -54,319 +53,331 @@ func ReadIAVLNode(r io.Reader, n *int64, err *error) *IAVLNode {
 	return node
 }
 
-func (self *IAVLNode) Copy() *IAVLNode {
+func (node *IAVLNode) _copy() *IAVLNode {
-	if self.height == 0 {
+	if node.height == 0 {
 		panic("Why are you copying a value node?")
 	}
 	return &IAVLNode{
-		key:       self.key,
+		key:       node.key,
-		size:      self.size,
+		size:      node.size,
-		height:    self.height,
+		height:    node.height,
 		hash:      nil, // Going to be mutated anyways.
-		leftHash:  self.leftHash,
+		leftHash:  node.leftHash,
-		leftNode:  self.leftNode,
+		leftNode:  node.leftNode,
-		rightHash: self.rightHash,
+		rightHash: node.rightHash,
-		rightNode: self.rightNode,
+		rightNode: node.rightNode,
-		persisted: self.persisted,
+		persisted: node.persisted,
 	}
 }
 
-func (self *IAVLNode) Size() uint64 {
+func (node *IAVLNode) has(t *IAVLTree, key interface{}) (has bool) {
-	return self.size
+	if t.keyCodec.Compare(node.key, key) == 0 {
-}
-
-func (self *IAVLNode) Height() uint8 {
-	return self.height
-}
-
-func (self *IAVLNode) has(ndb *IAVLNodeDB, key []byte) (has bool) {
-	if bytes.Equal(self.key, key) {
 		return true
 	}
-	if self.height == 0 {
+	if node.height == 0 {
 		return false
 	} else {
-		if bytes.Compare(key, self.key) == -1 {
+		if t.keyCodec.Compare(key, node.key) < 0 {
-			return self.getLeftNode(ndb).has(ndb, key)
+			return node.getLeftNode(t).has(t, key)
 		} else {
-			return self.getRightNode(ndb).has(ndb, key)
+			return node.getRightNode(t).has(t, key)
 		}
 	}
 }
 
-func (self *IAVLNode) get(ndb *IAVLNodeDB, key []byte) (value []byte) {
+func (node *IAVLNode) get(t *IAVLTree, key interface{}) (index uint64, value interface{}) {
-	if self.height == 0 {
+	if node.height == 0 {
-		if bytes.Equal(self.key, key) {
+		if t.keyCodec.Compare(node.key, key) == 0 {
-			return self.value
+			return 0, node.value
 		} else {
-			return nil
+			return 0, nil
 		}
 	} else {
-		if bytes.Compare(key, self.key) == -1 {
+		if t.keyCodec.Compare(key, node.key) < 0 {
-			return self.getLeftNode(ndb).get(ndb, key)
+			return node.getLeftNode(t).get(t, key)
 		} else {
-			return self.getRightNode(ndb).get(ndb, key)
+			rightNode := node.getRightNode(t)
+			index, value = rightNode.get(t, key)
+			index += node.size - rightNode.size
+			return index, value
 		}
 	}
 }
 
-func (self *IAVLNode) HashWithCount() ([]byte, uint64) {
+func (node *IAVLNode) getByIndex(t *IAVLTree, index uint64) (key interface{}, value interface{}) {
-	if self.hash != nil {
+	if node.height == 0 {
-		return self.hash, 0
+		if index == 0 {
+			return node.key, node.value
+		} else {
+			panic("getByIndex asked for invalid index")
+		}
+	} else {
+		// TODO: could improve this by storing the
+		// sizes as well as left/right hash.
+		leftNode := node.getLeftNode(t)
+		if index < leftNode.size {
+			return leftNode.getByIndex(t, index)
+		} else {
+			return node.getRightNode(t).getByIndex(t, index-leftNode.size)
+		}
+	}
+}
+
+func (node *IAVLNode) hashWithCount(t *IAVLTree) ([]byte, uint64) {
+	if node.hash != nil {
+		return node.hash, 0
 	}
 
 	hasher := sha256.New()
-	_, hashCount, err := self.writeToCountHashes(hasher)
+	_, hashCount, err := node.writeToCountHashes(t, hasher)
 	if err != nil {
 		panic(err)
 	}
-	self.hash = hasher.Sum(nil)
+	node.hash = hasher.Sum(nil)
 
-	return self.hash, hashCount + 1
+	return node.hash, hashCount + 1
 }
 
-func (self *IAVLNode) Save(ndb *IAVLNodeDB) []byte {
+func (node *IAVLNode) save(t *IAVLTree) []byte {
-	if self.hash == nil {
+	if node.hash == nil {
-		self.hash, _ = self.HashWithCount()
+		node.hash, _ = node.hashWithCount(t)
 	}
-	if self.persisted {
+	if node.persisted {
-		return self.hash
+		return node.hash
 	}
 
 	// save children
-	if self.leftNode != nil {
+	if node.leftNode != nil {
-		self.leftHash = self.leftNode.Save(ndb)
+		node.leftHash = node.leftNode.save(t)
-		self.leftNode = nil
+		node.leftNode = nil
 	}
-	if self.rightNode != nil {
+	if node.rightNode != nil {
-		self.rightHash = self.rightNode.Save(ndb)
+		node.rightHash = node.rightNode.save(t)
-		self.rightNode = nil
+		node.rightNode = nil
 	}
 
-	// save self
+	// save node
-	ndb.Save(self)
+	t.saveNode(node)
-	return self.hash
+	return node.hash
 }
 
-func (self *IAVLNode) set(ndb *IAVLNodeDB, key []byte, value []byte) (_ *IAVLNode, updated bool) {
+func (node *IAVLNode) set(t *IAVLTree, key interface{}, value interface{}) (newSelf *IAVLNode, updated bool) {
-	if self.height == 0 {
+	if node.height == 0 {
-		if bytes.Compare(key, self.key) == -1 {
+		cmp := t.keyCodec.Compare(key, node.key)
+		if cmp < 0 {
 			return &IAVLNode{
-				key:       self.key,
+				key:       node.key,
 				height:    1,
 				size:      2,
 				leftNode:  NewIAVLNode(key, value),
-				rightNode: self,
+				rightNode: node,
 			}, false
-		} else if bytes.Equal(self.key, key) {
+		} else if cmp == 0 {
 			return NewIAVLNode(key, value), true
 		} else {
 			return &IAVLNode{
 				key:       key,
 				height:    1,
 				size:      2,
-				leftNode:  self,
+				leftNode:  node,
 				rightNode: NewIAVLNode(key, value),
 			}, false
 		}
 	} else {
-		self = self.Copy()
+		node = node._copy()
-		if bytes.Compare(key, self.key) == -1 {
+		if t.keyCodec.Compare(key, node.key) < 0 {
-			self.leftNode, updated = self.getLeftNode(ndb).set(ndb, key, value)
+			node.leftNode, updated = node.getLeftNode(t).set(t, key, value)
-			self.leftHash = nil
+			node.leftHash = nil
 		} else {
-			self.rightNode, updated = self.getRightNode(ndb).set(ndb, key, value)
+			node.rightNode, updated = node.getRightNode(t).set(t, key, value)
-			self.rightHash = nil
+			node.rightHash = nil
 		}
 		if updated {
-			return self, updated
+			return node, updated
 		} else {
-			self.calcHeightAndSize(ndb)
+			node.calcHeightAndSize(t)
-			return self.balance(ndb), updated
+			return node.balance(t), updated
 		}
 	}
 }
 
-// newHash/newNode: The new hash or node to replace self after remove.
+// newHash/newNode: The new hash or node to replace node after remove.
 // newKey: new leftmost leaf key for tree after successfully removing 'key' if changed.
 // value: removed value.
-func (self *IAVLNode) remove(ndb *IAVLNodeDB, key []byte) (
+func (node *IAVLNode) remove(t *IAVLTree, key interface{}) (
-	newHash []byte, newNode *IAVLNode, newKey []byte, value []byte, err error) {
+	newHash []byte, newNode *IAVLNode, newKey interface{}, value interface{}, removed bool) {
-	if self.height == 0 {
+	if node.height == 0 {
-		if bytes.Equal(self.key, key) {
+		if t.keyCodec.Compare(key, node.key) == 0 {
-			return nil, nil, nil, self.value, nil
+			return nil, nil, nil, node.value, true
 		} else {
-			return nil, self, nil, nil, NotFound(key)
+			return nil, node, nil, nil, false
 		}
 	} else {
-		if bytes.Compare(key, self.key) == -1 {
+		if t.keyCodec.Compare(key, node.key) < 0 {
 			var newLeftHash []byte
 			var newLeftNode *IAVLNode
-			newLeftHash, newLeftNode, newKey, value, err = self.getLeftNode(ndb).remove(ndb, key)
+			newLeftHash, newLeftNode, newKey, value, removed = node.getLeftNode(t).remove(t, key)
-			if err != nil {
+			if !removed {
-				return nil, self, nil, value, err
+				return nil, node, nil, value, false
 			} else if newLeftHash == nil && newLeftNode == nil { // left node held value, was removed
-				return self.rightHash, self.rightNode, self.key, value, nil
+				return node.rightHash, node.rightNode, node.key, value, true
 			}
-			self = self.Copy()
+			node = node._copy()
-			self.leftHash, self.leftNode = newLeftHash, newLeftNode
+			node.leftHash, node.leftNode = newLeftHash, newLeftNode
+			node.calcHeightAndSize(t)
+			return nil, node.balance(t), newKey, value, true
 		} else {
 			var newRightHash []byte
 			var newRightNode *IAVLNode
-			newRightHash, newRightNode, newKey, value, err = self.getRightNode(ndb).remove(ndb, key)
+			newRightHash, newRightNode, newKey, value, removed = node.getRightNode(t).remove(t, key)
-			if err != nil {
+			if !removed {
-				return nil, self, nil, value, err
+				return nil, node, nil, value, false
 			} else if newRightHash == nil && newRightNode == nil { // right node held value, was removed
-				return self.leftHash, self.leftNode, nil, value, nil
+				return node.leftHash, node.leftNode, nil, value, true
 			}
-			self = self.Copy()
+			node = node._copy()
-			self.rightHash, self.rightNode = newRightHash, newRightNode
+			node.rightHash, node.rightNode = newRightHash, newRightNode
 			if newKey != nil {
-				self.key = newKey
+				node.key = newKey
 				newKey = nil
 			}
+			node.calcHeightAndSize(t)
+			return nil, node.balance(t), newKey, value, true
 		}
-		self.calcHeightAndSize(ndb)
-		return nil, self.balance(ndb), newKey, value, err
 	}
 }
 
-func (self *IAVLNode) WriteTo(w io.Writer) (n int64, err error) {
+func (node *IAVLNode) writeToCountHashes(t *IAVLTree, w io.Writer) (n int64, hashCount uint64, err error) {
-	n, _, err = self.writeToCountHashes(w)
-	return
-}
-
-func (self *IAVLNode) writeToCountHashes(w io.Writer) (n int64, hashCount uint64, err error) {
 	// height & size & key
-	WriteUInt8(w, self.height, &n, &err)
+	WriteUInt8(w, node.height, &n, &err)
-	WriteUInt64(w, self.size, &n, &err)
+	WriteUInt64(w, node.size, &n, &err)
-	WriteByteSlice(w, self.key, &n, &err)
+	t.keyCodec.Encode(node.key, w, &n, &err)
 	if err != nil {
 		return
 	}
 
-	if self.height == 0 {
+	if node.height == 0 {
 		// value
-		WriteByteSlice(w, self.value, &n, &err)
+		t.valueCodec.Encode(node.value, w, &n, &err)
 	} else {
 		// left
-		if self.leftNode != nil {
+		if node.leftNode != nil {
-			leftHash, leftCount := self.leftNode.HashWithCount()
+			leftHash, leftCount := node.leftNode.hashWithCount(t)
-			self.leftHash = leftHash
+			node.leftHash = leftHash
 			hashCount += leftCount
 		}
-		if self.leftHash == nil {
+		if node.leftHash == nil {
-			panic("self.leftHash was nil in save")
+			panic("node.leftHash was nil in save")
 		}
-		WriteByteSlice(w, self.leftHash, &n, &err)
+		WriteByteSlice(w, node.leftHash, &n, &err)
 		// right
-		if self.rightNode != nil {
+		if node.rightNode != nil {
-			rightHash, rightCount := self.rightNode.HashWithCount()
+			rightHash, rightCount := node.rightNode.hashWithCount(t)
-			self.rightHash = rightHash
+			node.rightHash = rightHash
 			hashCount += rightCount
 		}
-		if self.rightHash == nil {
+		if node.rightHash == nil {
-			panic("self.rightHash was nil in save")
+			panic("node.rightHash was nil in save")
 		}
-		WriteByteSlice(w, self.rightHash, &n, &err)
+		WriteByteSlice(w, node.rightHash, &n, &err)
 	}
 	return
 }
 
-func (self *IAVLNode) getLeftNode(ndb *IAVLNodeDB) *IAVLNode {
+func (node *IAVLNode) getLeftNode(t *IAVLTree) *IAVLNode {
-	if self.leftNode != nil {
+	if node.leftNode != nil {
-		return self.leftNode
+		return node.leftNode
 	} else {
-		return ndb.Get(self.leftHash)
+		return t.getNode(node.leftHash)
 	}
 }
 
-func (self *IAVLNode) getRightNode(ndb *IAVLNodeDB) *IAVLNode {
+func (node *IAVLNode) getRightNode(t *IAVLTree) *IAVLNode {
-	if self.rightNode != nil {
+	if node.rightNode != nil {
-		return self.rightNode
+		return node.rightNode
 	} else {
-		return ndb.Get(self.rightHash)
+		return t.getNode(node.rightHash)
 	}
 }
 
-func (self *IAVLNode) rotateRight(ndb *IAVLNodeDB) *IAVLNode {
+func (node *IAVLNode) rotateRight(t *IAVLTree) *IAVLNode {
-	self = self.Copy()
+	node = node._copy()
-	sl := self.getLeftNode(ndb).Copy()
+	sl := node.getLeftNode(t)._copy()
 
 	slrHash, slrCached := sl.rightHash, sl.rightNode
-	sl.rightHash, sl.rightNode = nil, self
+	sl.rightHash, sl.rightNode = nil, node
-	self.leftHash, self.leftNode = slrHash, slrCached
+	node.leftHash, node.leftNode = slrHash, slrCached
 
-	self.calcHeightAndSize(ndb)
+	node.calcHeightAndSize(t)
-	sl.calcHeightAndSize(ndb)
+	sl.calcHeightAndSize(t)
 
 	return sl
 }
 
-func (self *IAVLNode) rotateLeft(ndb *IAVLNodeDB) *IAVLNode {
+func (node *IAVLNode) rotateLeft(t *IAVLTree) *IAVLNode {
-	self = self.Copy()
+	node = node._copy()
-	sr := self.getRightNode(ndb).Copy()
+	sr := node.getRightNode(t)._copy()
 
 	srlHash, srlCached := sr.leftHash, sr.leftNode
-	sr.leftHash, sr.leftNode = nil, self
+	sr.leftHash, sr.leftNode = nil, node
-	self.rightHash, self.rightNode = srlHash, srlCached
+	node.rightHash, node.rightNode = srlHash, srlCached
 
-	self.calcHeightAndSize(ndb)
+	node.calcHeightAndSize(t)
-	sr.calcHeightAndSize(ndb)
+	sr.calcHeightAndSize(t)
 
 	return sr
 }
 
-func (self *IAVLNode) calcHeightAndSize(ndb *IAVLNodeDB) {
+func (node *IAVLNode) calcHeightAndSize(t *IAVLTree) {
-	self.height = maxUint8(self.getLeftNode(ndb).Height(), self.getRightNode(ndb).Height()) + 1
+	node.height = maxUint8(node.getLeftNode(t).height, node.getRightNode(t).height) + 1
-	self.size = self.getLeftNode(ndb).Size() + self.getRightNode(ndb).Size()
+	node.size = node.getLeftNode(t).size + node.getRightNode(t).size
 }
 
-func (self *IAVLNode) calcBalance(ndb *IAVLNodeDB) int {
+func (node *IAVLNode) calcBalance(t *IAVLTree) int {
-	return int(self.getLeftNode(ndb).Height()) - int(self.getRightNode(ndb).Height())
+	return int(node.getLeftNode(t).height) - int(node.getRightNode(t).height)
 }
 
-func (self *IAVLNode) balance(ndb *IAVLNodeDB) (newSelf *IAVLNode) {
+func (node *IAVLNode) balance(t *IAVLTree) (newSelf *IAVLNode) {
-	balance := self.calcBalance(ndb)
+	balance := node.calcBalance(t)
 	if balance > 1 {
-		if self.getLeftNode(ndb).calcBalance(ndb) >= 0 {
+		if node.getLeftNode(t).calcBalance(t) >= 0 {
 			// Left Left Case
-			return self.rotateRight(ndb)
+			return node.rotateRight(t)
 		} else {
 			// Left Right Case
-			self = self.Copy()
+			node = node._copy()
-			self.leftHash, self.leftNode = nil, self.getLeftNode(ndb).rotateLeft(ndb)
+			node.leftHash, node.leftNode = nil, node.getLeftNode(t).rotateLeft(t)
-			//self.calcHeightAndSize()
+			//node.calcHeightAndSize()
-			return self.rotateRight(ndb)
+			return node.rotateRight(t)
 		}
 	}
 	if balance < -1 {
-		if self.getRightNode(ndb).calcBalance(ndb) <= 0 {
+		if node.getRightNode(t).calcBalance(t) <= 0 {
 			// Right Right Case
-			return self.rotateLeft(ndb)
+			return node.rotateLeft(t)
 		} else {
 			// Right Left Case
-			self = self.Copy()
+			node = node._copy()
-			self.rightHash, self.rightNode = nil, self.getRightNode(ndb).rotateRight(ndb)
+			node.rightHash, node.rightNode = nil, node.getRightNode(t).rotateRight(t)
-			//self.calcHeightAndSize()
+			//node.calcHeightAndSize()
-			return self.rotateLeft(ndb)
+			return node.rotateLeft(t)
 		}
 	}
 	// Nothing changed
-	return self
+	return node
 }
 
-func (self *IAVLNode) traverse(ndb *IAVLNodeDB, cb func(*IAVLNode) bool) bool {
+func (node *IAVLNode) traverse(t *IAVLTree, cb func(*IAVLNode) bool) bool {
-	stop := cb(self)
+	stop := cb(node)
 	if stop {
 		return stop
 	}
-	if self.height > 0 {
+	if node.height > 0 {
-		stop = self.getLeftNode(ndb).traverse(ndb, cb)
+		stop = node.getLeftNode(t).traverse(t, cb)
 		if stop {
 			return stop
 		}
-		stop = self.getRightNode(ndb).traverse(ndb, cb)
+		stop = node.getRightNode(t).traverse(t, cb)
 		if stop {
 			return stop
 		}
@@ -375,17 +386,17 @@ func (self *IAVLNode) traverse(ndb *IAVLNodeDB, cb func(*IAVLNode) bool) bool {
 }
 
 // Only used in testing...
-func (self *IAVLNode) lmd(ndb *IAVLNodeDB) *IAVLNode {
+func (node *IAVLNode) lmd(t *IAVLTree) *IAVLNode {
-	if self.height == 0 {
+	if node.height == 0 {
-		return self
+		return node
 	}
-	return self.getLeftNode(ndb).lmd(ndb)
+	return node.getLeftNode(t).lmd(t)
 }
 
 // Only used in testing...
-func (self *IAVLNode) rmd(ndb *IAVLNodeDB) *IAVLNode {
+func (node *IAVLNode) rmd(t *IAVLTree) *IAVLNode {
-	if self.height == 0 {
+	if node.height == 0 {
-		return self
+		return node
 	}
-	return self.getRightNode(ndb).rmd(ndb)
+	return node.getRightNode(t).rmd(t)
 }

merkle/iavl_test.go

@@ -2,9 +2,7 @@ package merkle
 
 import (
 	"bytes"
-	"crypto/sha256"
 	"fmt"
-	"time"
 
 	. "github.com/tendermint/tendermint/binary"
 	. "github.com/tendermint/tendermint/common"
@@ -22,116 +20,127 @@ func randstr(length int) string {
 	return RandStr(length)
 }
 
+// Convenience for a new node
+func N(l, r interface{}) *IAVLNode {
+	var left, right *IAVLNode
+	if _, ok := l.(*IAVLNode); ok {
+		left = l.(*IAVLNode)
+	} else {
+		left = NewIAVLNode(l, "")
+	}
+	if _, ok := r.(*IAVLNode); ok {
+		right = r.(*IAVLNode)
+	} else {
+		right = NewIAVLNode(r, "")
+	}
+
+	n := &IAVLNode{
+		key:       right.lmd(nil).key,
+		value:     "",
+		leftNode:  left,
+		rightNode: right,
+	}
+	n.calcHeightAndSize(nil)
+	return n
+}
+
+// Setup a deep node
+func T(n *IAVLNode) *IAVLTree {
+	t := NewIAVLTree(BasicCodec, BasicCodec, 0, nil)
+	n.hashWithCount(t)
+	t.root = n
+	return t
+}
+
+// Convenience for simple printing of keys & tree structure
+func P(n *IAVLNode) string {
+	if n.height == 0 {
+		return fmt.Sprintf("%v", n.key)
+	} else {
+		return fmt.Sprintf("(%v %v)", P(n.leftNode), P(n.rightNode))
+	}
+}
+
 func TestUnit(t *testing.T) {
 
-	// Convenience for a new node
+	expectHash := func(tree *IAVLTree, hashCount uint64) {
-	N := func(l, r interface{}) *IAVLNode {
-		var left, right *IAVLNode
-		if _, ok := l.(*IAVLNode); ok {
-			left = l.(*IAVLNode)
-		} else {
-			left = NewIAVLNode([]byte{byte(l.(int))}, nil)
-		}
-		if _, ok := r.(*IAVLNode); ok {
-			right = r.(*IAVLNode)
-		} else {
-			right = NewIAVLNode([]byte{byte(r.(int))}, nil)
-		}
-
-		n := &IAVLNode{
-			key:       right.lmd(nil).key,
-			leftNode:  left,
-			rightNode: right,
-		}
-		n.calcHeightAndSize(nil)
-		n.HashWithCount()
-		return n
-	}
-
-	// Convenience for simple printing of keys & tree structure
-	var P func(*IAVLNode) string
-	P = func(n *IAVLNode) string {
-		if n.height == 0 {
-			return fmt.Sprintf("%v", n.key[0])
-		} else {
-			return fmt.Sprintf("(%v %v)", P(n.leftNode), P(n.rightNode))
-		}
-	}
-
-	expectHash := func(n2 *IAVLNode, hashCount uint64) {
 		// ensure number of new hash calculations is as expected.
-		hash, count := n2.HashWithCount()
+		hash, count := tree.HashWithCount()
 		if count != hashCount {
 			t.Fatalf("Expected %v new hashes, got %v", hashCount, count)
 		}
 		// nuke hashes and reconstruct hash, ensure it's the same.
-		n2.traverse(nil, func(node *IAVLNode) bool {
+		tree.root.traverse(tree, func(node *IAVLNode) bool {
 			node.hash = nil
 			return false
 		})
 		// ensure that the new hash after nuking is the same as the old.
-		newHash, _ := n2.HashWithCount()
+		newHash, _ := tree.HashWithCount()
 		if bytes.Compare(hash, newHash) != 0 {
 			t.Fatalf("Expected hash %v but got %v after nuking", hash, newHash)
 		}
 	}
 
-	expectSet := func(n *IAVLNode, i int, repr string, hashCount uint64) {
+	expectSet := func(tree *IAVLTree, i int, repr string, hashCount uint64) {
-		n2, updated := n.set(nil, []byte{byte(i)}, nil)
+		origNode := tree.root
+		updated := tree.Set(i, "")
 		// ensure node was added & structure is as expected.
-		if updated == true || P(n2) != repr {
+		if updated == true || P(tree.root) != repr {
 			t.Fatalf("Adding %v to %v:\nExpected         %v\nUnexpectedly got %v updated:%v",
-				i, P(n), repr, P(n2), updated)
+				i, P(origNode), repr, P(tree.root), updated)
 		}
 		// ensure hash calculation requirements
-		expectHash(n2, hashCount)
+		expectHash(tree, hashCount)
+		tree.root = origNode
 	}
 
-	expectRemove := func(n *IAVLNode, i int, repr string, hashCount uint64) {
+	expectRemove := func(tree *IAVLTree, i int, repr string, hashCount uint64) {
-		_, n2, _, value, err := n.remove(nil, []byte{byte(i)})
+		origNode := tree.root
+		value, removed := tree.Remove(i)
 		// ensure node was added & structure is as expected.
-		if value != nil || err != nil || P(n2) != repr {
+		if value != "" || !removed || P(tree.root) != repr {
-			t.Fatalf("Removing %v from %v:\nExpected         %v\nUnexpectedly got %v value:%v err:%v",
+			t.Fatalf("Removing %v from %v:\nExpected         %v\nUnexpectedly got %v value:%v removed:%v",
-				i, P(n), repr, P(n2), value, err)
+				i, P(origNode), repr, P(tree.root), value, removed)
 		}
 		// ensure hash calculation requirements
-		expectHash(n2, hashCount)
+		expectHash(tree, hashCount)
+		tree.root = origNode
 	}
 
 	//////// Test Set cases:
 
 	// Case 1:
-	n1 := N(4, 20)
+	t1 := T(N(4, 20))
 
-	expectSet(n1, 8, "((4 8) 20)", 3)
+	expectSet(t1, 8, "((4 8) 20)", 3)
-	expectSet(n1, 25, "(4 (20 25))", 3)
+	expectSet(t1, 25, "(4 (20 25))", 3)
 
-	n2 := N(4, N(20, 25))
+	t2 := T(N(4, N(20, 25)))
 
-	expectSet(n2, 8, "((4 8) (20 25))", 3)
+	expectSet(t2, 8, "((4 8) (20 25))", 3)
-	expectSet(n2, 30, "((4 20) (25 30))", 4)
+	expectSet(t2, 30, "((4 20) (25 30))", 4)
 
-	n3 := N(N(1, 2), 6)
+	t3 := T(N(N(1, 2), 6))
 
-	expectSet(n3, 4, "((1 2) (4 6))", 4)
+	expectSet(t3, 4, "((1 2) (4 6))", 4)
-	expectSet(n3, 8, "((1 2) (6 8))", 3)
+	expectSet(t3, 8, "((1 2) (6 8))", 3)
 
-	n4 := N(N(1, 2), N(N(5, 6), N(7, 9)))
+	t4 := T(N(N(1, 2), N(N(5, 6), N(7, 9))))
 
-	expectSet(n4, 8, "(((1 2) (5 6)) ((7 8) 9))", 5)
+	expectSet(t4, 8, "(((1 2) (5 6)) ((7 8) 9))", 5)
-	expectSet(n4, 10, "(((1 2) (5 6)) (7 (9 10)))", 5)
+	expectSet(t4, 10, "(((1 2) (5 6)) (7 (9 10)))", 5)
 
 	//////// Test Remove cases:
 
-	n10 := N(N(1, 2), 3)
+	t10 := T(N(N(1, 2), 3))
 
-	expectRemove(n10, 2, "(1 3)", 1)
+	expectRemove(t10, 2, "(1 3)", 1)
-	expectRemove(n10, 3, "(1 2)", 0)
+	expectRemove(t10, 3, "(1 2)", 0)
 
-	n11 := N(N(N(1, 2), 3), N(4, 5))
+	t11 := T(N(N(N(1, 2), 3), N(4, 5)))
 
-	expectRemove(n11, 4, "((1 2) (3 5))", 2)
+	expectRemove(t11, 4, "((1 2) (3 5))", 2)
-	expectRemove(n11, 3, "((1 2) (4 5))", 1)
+	expectRemove(t11, 3, "((1 2) (4 5))", 1)
 
 }
 
@@ -143,10 +152,7 @@ func TestIntegration(t *testing.T) {
 	}
 
 	records := make([]*record, 400)
-	var tree *IAVLTree = NewIAVLTree(nil)
+	var tree *IAVLTree = NewIAVLTree(BasicCodec, BasicCodec, 0, nil)
-	var err error
-	var val []byte
-	var updated bool
 
 	randomRecord := func() *record {
 		return &record{randstr(20), randstr(20)}
@@ -157,11 +163,11 @@ func TestIntegration(t *testing.T) {
 		records[i] = r
 		//t.Log("New record", r)
 		//PrintIAVLNode(tree.root)
-		updated = tree.Set([]byte(r.key), []byte(""))
+		updated := tree.Set(r.key, "")
 		if updated {
 			t.Error("should have not been updated")
 		}
-		updated = tree.Set([]byte(r.key), []byte(r.value))
+		updated = tree.Set(r.key, r.value)
 		if !updated {
 			t.Error("should have been updated")
 		}
@@ -171,32 +177,32 @@ func TestIntegration(t *testing.T) {
 	}
 
 	for _, r := range records {
-		if has := tree.Has([]byte(r.key)); !has {
+		if has := tree.Has(r.key); !has {
 			t.Error("Missing key", r.key)
 		}
-		if has := tree.Has([]byte(randstr(12))); has {
+		if has := tree.Has(randstr(12)); has {
 			t.Error("Table has extra key")
 		}
-		if val := tree.Get([]byte(r.key)); string(val) != r.value {
+		if _, val := tree.Get(r.key); val.(string) != r.value {
 			t.Error("wrong value")
 		}
 	}
 
 	for i, x := range records {
-		if val, err = tree.Remove([]byte(x.key)); err != nil {
+		if val, removed := tree.Remove(x.key); !removed {
-			t.Error(err)
+			t.Error("Wasn't removed")
-		} else if string(val) != x.value {
+		} else if val != x.value {
-			t.Error("wrong value")
+			t.Error("Wrong value")
 		}
 		for _, r := range records[i+1:] {
-			if has := tree.Has([]byte(r.key)); !has {
+			if has := tree.Has(r.key); !has {
 				t.Error("Missing key", r.key)
 			}
-			if has := tree.Has([]byte(randstr(12))); has {
+			if has := tree.Has(randstr(12)); has {
 				t.Error("Table has extra key")
 			}
-			val := tree.Get([]byte(r.key))
+			_, val := tree.Get(r.key)
-			if string(val) != r.value {
+			if val != r.value {
 				t.Error("wrong value")
 			}
 		}
@@ -216,96 +222,30 @@ func TestPersistence(t *testing.T) {
 	}
 
 	// Construct some tree and save it
-	t1 := NewIAVLTree(db)
+	t1 := NewIAVLTree(BasicCodec, BasicCodec, 0, db)
 	for key, value := range records {
-		t1.Set([]byte(key), []byte(value))
+		t1.Set(key, value)
 	}
 	t1.Save()
 
 	hash, _ := t1.HashWithCount()
 
 	// Load a tree
-	t2 := LoadIAVLTreeFromHash(db, hash)
+	t2 := LoadIAVLTreeFromHash(BasicCodec, BasicCodec, 0, db, hash)
 	for key, value := range records {
-		t2value := t2.Get([]byte(key))
+		_, t2value := t2.Get(key)
-		if string(t2value) != value {
+		if t2value != value {
 			t.Fatalf("Invalid value. Expected %v, got %v", value, t2value)
 		}
 	}
 }
 
-func TestTypedTree(t *testing.T) {
-	db := db.NewMemDB()
-
-	// Construct some tree and save it
-	t1 := NewTypedTree(NewIAVLTree(db), BasicCodec, BasicCodec)
-	t1.Set(uint8(1), "uint8(1)")
-	t1.Set(uint16(1), "uint16(1)")
-	t1.Set(uint32(1), "uint32(1)")
-	t1.Set(uint64(1), "uint64(1)")
-	t1.Set("byteslice01", []byte{byte(0x00), byte(0x01)})
-	t1.Set("byteslice23", []byte{byte(0x02), byte(0x03)})
-	t1.Set("time", time.Unix(123, 0))
-	t1.Set("nil", nil)
-	t1Hash := t1.Tree.Save()
-
-	// Reconstruct tree
-	t2 := NewTypedTree(LoadIAVLTreeFromHash(db, t1Hash), BasicCodec, BasicCodec)
-	if t2.Get(uint8(1)).(string) != "uint8(1)" {
-		t.Errorf("Expected string uint8(1)")
-	}
-	if t2.Get(uint16(1)).(string) != "uint16(1)" {
-		t.Errorf("Expected string uint16(1)")
-	}
-	if t2.Get(uint32(1)).(string) != "uint32(1)" {
-		t.Errorf("Expected string uint32(1)")
-	}
-	if t2.Get(uint64(1)).(string) != "uint64(1)" {
-		t.Errorf("Expected string uint64(1)")
-	}
-	if !bytes.Equal(t2.Get("byteslice01").([]byte), []byte{byte(0x00), byte(0x01)}) {
-		t.Errorf("Expected byteslice 0x00 0x01")
-	}
-	if !bytes.Equal(t2.Get("byteslice23").([]byte), []byte{byte(0x02), byte(0x03)}) {
-		t.Errorf("Expected byteslice 0x02 0x03")
-	}
-	if t2.Get("time").(time.Time).Unix() != 123 {
-		t.Errorf("Expected time 123")
-	}
-	if t2.Get("nil") != nil {
-		t.Errorf("Expected nil")
-	}
-}
-
-func BenchmarkHash(b *testing.B) {
-	b.StopTimer()
-
-	s := randstr(128)
-
-	b.StartTimer()
-	for i := 0; i < b.N; i++ {
-		hasher := sha256.New()
-		hasher.Write([]byte(s))
-		hasher.Sum(nil)
-	}
-}
-
 func BenchmarkImmutableAvlTree(b *testing.B) {
 	b.StopTimer()
 
-	type record struct {
+	t := NewIAVLTree(BasicCodec, BasicCodec, 0, nil)
-		key   string
-		value string
-	}
-
-	randomRecord := func() *record {
-		return &record{randstr(32), randstr(32)}
-	}
-
-	t := NewIAVLTree(nil)
 	for i := 0; i < 1000000; i++ {
-		r := randomRecord()
+		t.Set(RandUInt64(), "")
-		t.Set([]byte(r.key), []byte(r.value))
 	}
 
 	fmt.Println("ok, starting")
@@ -314,8 +254,8 @@ func BenchmarkImmutableAvlTree(b *testing.B) {
 
 	b.StartTimer()
 	for i := 0; i < b.N; i++ {
-		r := randomRecord()
+		ri := RandUInt64()
-		t.Set([]byte(r.key), []byte(r.value))
+		t.Set(ri, "")
-		t.Remove([]byte(r.key))
+		t.Remove(ri)
 	}
 }

merkle/iavl_tree.go

@@ -3,6 +3,9 @@ package merkle
 import (
 	"bytes"
 	"container/list"
+
+	. "github.com/tendermint/tendermint/binary"
+	. "github.com/tendermint/tendermint/db"
 )
 
 const defaultCacheCapacity = 1000 // TODO make configurable.
@@ -14,53 +17,64 @@ This tree is not concurrency safe.
 You must wrap your calls with your own mutex.
 */
 type IAVLTree struct {
-	ndb  *IAVLNodeDB
+	keyCodec   Codec
-	root *IAVLNode
+	valueCodec Codec
+	root       *IAVLNode
+
+	// Cache
+	cache     map[string]nodeElement
+	cacheSize int
+	queue     *list.List
+
+	// Persistence
+	db DB
 }
 
-func NewIAVLTree(db DB) *IAVLTree {
+func NewIAVLTree(keyCodec, valueCodec Codec, cacheSize int, db DB) *IAVLTree {
 	return &IAVLTree{
-		ndb:  NewIAVLNodeDB(defaultCacheCapacity, db),
+		keyCodec:   keyCodec,
-		root: nil,
+		valueCodec: valueCodec,
+		root:       nil,
+		cache:      make(map[string]nodeElement),
+		cacheSize:  cacheSize,
+		queue:      list.New(),
+		db:         db,
 	}
 }
 
-func LoadIAVLTreeFromHash(db DB, hash []byte) *IAVLTree {
+func LoadIAVLTreeFromHash(keyCodec, valueCodec Codec, cacheSize int, db DB, hash []byte) *IAVLTree {
-	ndb := NewIAVLNodeDB(defaultCacheCapacity, db)
+	t := NewIAVLTree(keyCodec, valueCodec, cacheSize, db)
-	root := ndb.Get(hash)
+	t.root = t.getNode(hash)
-	if root == nil {
+	return t
-		return nil
-	}
-	return &IAVLTree{ndb: ndb, root: root}
 }
 
 func (t *IAVLTree) Size() uint64 {
 	if t.root == nil {
 		return 0
 	}
-	return t.root.Size()
+	return t.root.size
 }
 
 func (t *IAVLTree) Height() uint8 {
 	if t.root == nil {
 		return 0
 	}
-	return t.root.Height()
+	return t.root.height
 }
 
-func (t *IAVLTree) Has(key []byte) bool {
+func (t *IAVLTree) Has(key interface{}) bool {
 	if t.root == nil {
 		return false
 	}
-	return t.root.has(t.ndb, key)
+	return t.root.has(t, key)
 }
 
-func (t *IAVLTree) Set(key []byte, value []byte) (updated bool) {
+func (t *IAVLTree) Set(key interface{}, value interface{}) (updated bool) {
 	if t.root == nil {
 		t.root = NewIAVLNode(key, value)
 		return false
 	}
-	t.root, updated = t.root.set(t.ndb, key, value)
+	t.root, updated = t.root.set(t, key, value)
 	return updated
 }
 
@@ -68,7 +82,7 @@ func (t *IAVLTree) Hash() []byte {
 	if t.root == nil {
 		return nil
 	}
-	hash, _ := t.root.HashWithCount()
+	hash, _ := t.root.hashWithCount(t)
 	return hash
 }
 
@@ -76,117 +90,110 @@ func (t *IAVLTree) HashWithCount() ([]byte, uint64) {
 	if t.root == nil {
 		return nil, 0
 	}
-	return t.root.HashWithCount()
+	return t.root.hashWithCount(t)
 }
 
 func (t *IAVLTree) Save() []byte {
 	if t.root == nil {
 		return nil
 	}
-	return t.root.Save(t.ndb)
+	return t.root.save(t)
 }
 
-func (t *IAVLTree) Get(key []byte) (value []byte) {
+func (t *IAVLTree) Get(key interface{}) (index uint64, value interface{}) {
 	if t.root == nil {
-		return nil
+		return 0, nil
 	}
-	return t.root.get(t.ndb, key)
+	return t.root.get(t, key)
 }
 
-func (t *IAVLTree) Remove(key []byte) (value []byte, err error) {
+func (t *IAVLTree) GetByIndex(index uint64) (key interface{}, value interface{}) {
 	if t.root == nil {
-		return nil, NotFound(key)
+		return nil, nil
 	}
-	newRootHash, newRoot, _, value, err := t.root.remove(t.ndb, key)
+	return t.root.getByIndex(t, index)
-	if err != nil {
+}
-		return nil, err
+
+func (t *IAVLTree) Remove(key interface{}) (value interface{}, removed bool) {
+	if t.root == nil {
+		return nil, false
+	}
+	newRootHash, newRoot, _, value, removed := t.root.remove(t, key)
+	if !removed {
+		return nil, false
 	}
 	if newRoot == nil && newRootHash != nil {
-		t.root = t.ndb.Get(newRootHash)
+		t.root = t.getNode(newRootHash)
 	} else {
 		t.root = newRoot
 	}
-	return value, nil
+	return value, true
 }
 
-func (t *IAVLTree) Copy() Tree {
+func (t *IAVLTree) Checkpoint() interface{} {
-	return &IAVLTree{ndb: t.ndb, root: t.root}
+	return t.root
 }
 
-//-----------------------------------------------------------------------------
+func (t *IAVLTree) Restore(checkpoint interface{}) {
+	t.root = checkpoint.(*IAVLNode)
+}
 
 type nodeElement struct {
 	node *IAVLNode
 	elem *list.Element
 }
 
-type IAVLNodeDB struct {
+func (t *IAVLTree) getNode(hash []byte) *IAVLNode {
-	capacity int
-	db       DB
-	cache    map[string]nodeElement
-	queue    *list.List
-}
-
-func NewIAVLNodeDB(capacity int, db DB) *IAVLNodeDB {
-	return &IAVLNodeDB{
-		capacity: capacity,
-		db:       db,
-		cache:    make(map[string]nodeElement),
-		queue:    list.New(),
-	}
-}
-
-func (ndb *IAVLNodeDB) Get(hash []byte) *IAVLNode {
 	// Check the cache.
-	nodeElem, ok := ndb.cache[string(hash)]
+	nodeElem, ok := t.cache[string(hash)]
 	if ok {
 		// Already exists. Move to back of queue.
-		ndb.queue.MoveToBack(nodeElem.elem)
+		t.queue.MoveToBack(nodeElem.elem)
 		return nodeElem.node
 	} else {
 		// Doesn't exist, load.
-		buf := ndb.db.Get(hash)
+		buf := t.db.Get(hash)
 		r := bytes.NewReader(buf)
 		var n int64
 		var err error
-		node := ReadIAVLNode(r, &n, &err)
+		node := ReadIAVLNode(t, r, &n, &err)
 		if err != nil {
 			panic(err)
 		}
 		node.persisted = true
-		ndb.cacheNode(node)
+		t.cacheNode(node)
 		return node
 	}
 }
 
-func (ndb *IAVLNodeDB) Save(node *IAVLNode) {
+func (t *IAVLTree) cacheNode(node *IAVLNode) {
+	// Create entry in cache and append to queue.
+	elem := t.queue.PushBack(node.hash)
+	t.cache[string(node.hash)] = nodeElement{node, elem}
+	// Maybe expire an item.
+	if t.queue.Len() > t.cacheSize {
+		hash := t.queue.Remove(t.queue.Front()).([]byte)
+		delete(t.cache, string(hash))
+	}
+}
+
+func (t *IAVLTree) saveNode(node *IAVLNode) {
 	if node.hash == nil {
 		panic("Expected to find node.hash, but none found.")
 	}
 	if node.persisted {
 		panic("Shouldn't be calling save on an already persisted node.")
 	}
-	if _, ok := ndb.cache[string(node.hash)]; ok {
+	if _, ok := t.cache[string(node.hash)]; ok {
 		panic("Shouldn't be calling save on an already cached node.")
 	}
 	// Save node bytes to db
 	buf := bytes.NewBuffer(nil)
-	_, err := node.WriteTo(buf)
+	_, _, err := node.writeToCountHashes(t, buf)
 	if err != nil {
 		panic(err)
 	}
-	ndb.db.Set(node.hash, buf.Bytes())
+	t.db.Set(node.hash, buf.Bytes())
 	node.persisted = true
-	ndb.cacheNode(node)
+	t.cacheNode(node)
-}
-
-func (ndb *IAVLNodeDB) cacheNode(node *IAVLNode) {
-	// Create entry in cache and append to queue.
-	elem := ndb.queue.PushBack(node.hash)
-	ndb.cache[string(node.hash)] = nodeElement{node, elem}
-	// Maybe expire an item.
-	if ndb.queue.Len() > ndb.capacity {
-		hash := ndb.queue.Remove(ndb.queue.Front()).([]byte)
-		delete(ndb.cache, string(hash))
-	}
 }

merkle/typed_tree.go

@@ -1,81 +0,0 @@
-package merkle
-
-import (
-	. "github.com/tendermint/tendermint/binary"
-	. "github.com/tendermint/tendermint/common"
-)
-
-// TODO: make TypedTree work with the underlying tree to cache the decoded value.
-type TypedTree struct {
-	Tree       Tree
-	keyCodec   Codec
-	valueCodec Codec
-}
-
-func NewTypedTree(tree Tree, keyCodec, valueCodec Codec) *TypedTree {
-	return &TypedTree{
-		Tree:       tree,
-		keyCodec:   keyCodec,
-		valueCodec: valueCodec,
-	}
-}
-
-func (t *TypedTree) Has(key interface{}) bool {
-	bytes, err := t.keyCodec.Write(key)
-	if err != nil {
-		Panicf("Error from keyCodec: %v", err)
-	}
-	return t.Tree.Has(bytes)
-}
-
-func (t *TypedTree) Get(key interface{}) interface{} {
-	keyBytes, err := t.keyCodec.Write(key)
-	if err != nil {
-		Panicf("Error from keyCodec: %v", err)
-	}
-	valueBytes := t.Tree.Get(keyBytes)
-	if valueBytes == nil {
-		return nil
-	}
-	value, err := t.valueCodec.Read(valueBytes)
-	if err != nil {
-		Panicf("Error from valueCodec: %v", err)
-	}
-	return value
-}
-
-func (t *TypedTree) Set(key interface{}, value interface{}) bool {
-	keyBytes, err := t.keyCodec.Write(key)
-	if err != nil {
-		Panicf("Error from keyCodec: %v", err)
-	}
-	valueBytes, err := t.valueCodec.Write(value)
-	if err != nil {
-		Panicf("Error from valueCodec: %v", err)
-	}
-	return t.Tree.Set(keyBytes, valueBytes)
-}
-
-func (t *TypedTree) Remove(key interface{}) (interface{}, error) {
-	keyBytes, err := t.keyCodec.Write(key)
-	if err != nil {
-		Panicf("Error from keyCodec: %v", err)
-	}
-	valueBytes, err := t.Tree.Remove(keyBytes)
-	if valueBytes == nil {
-		return nil, err
-	}
-	value, err_ := t.valueCodec.Read(valueBytes)
-	if err_ != nil {
-		Panicf("Error from valueCodec: %v", err)
-	}
-	return value, err
-}
-
-func (t *TypedTree) Copy() *TypedTree {
-	return &TypedTree{
-		Tree:       t.Tree.Copy(),
-		keyCodec:   t.keyCodec,
-		valueCodec: t.valueCodec,
-	}
-}

merkle/types.go

@@ -1,29 +1,18 @@
 package merkle
 
-import (
-	"fmt"
-)
-
-type DB interface {
-	Get([]byte) []byte
-	Set([]byte, []byte)
-}
-
 type Tree interface {
-	Size() uint64
+	Size() (size uint64)
-	Height() uint8
+	Height() (height uint8)
-	Has(key []byte) bool
+	Has(key interface{}) (has bool)
-	Get(key []byte) []byte
+	Get(key interface{}) (index uint64, value interface{})
-	Set(key []byte, value []byte) bool
+	GetByIndex(index uint64) (key interface{}, value interface{})
-	Remove(key []byte) ([]byte, error)
+	Set(key interface{}, value interface{}) (updated bool)
-	HashWithCount() ([]byte, uint64)
+	Remove(key interface{}) (value interface{}, removed bool)
-	Hash() []byte
+	HashWithCount() (hash []byte, count uint64)
-	Save() []byte
+	Hash() (hash []byte)
-	Copy() Tree
+	Save() (hash []byte)
-}
+	Checkpoint() (checkpoint interface{})
-
+	Restore(checkpoint interface{})
-func NotFound(key []byte) error {
-	return fmt.Errorf("Key was not found.")
 }
 
 type Hashable interface {