mirror of https://github.com/status-im/op-geth.git
116 lines
2.0 KiB
Go
116 lines
2.0 KiB
Go
package ptrie
|
|
|
|
import (
|
|
"bytes"
|
|
|
|
"github.com/ethereum/go-ethereum/trie"
|
|
)
|
|
|
|
type Iterator struct {
|
|
trie *Trie
|
|
|
|
Key []byte
|
|
Value []byte
|
|
}
|
|
|
|
func NewIterator(trie *Trie) *Iterator {
|
|
return &Iterator{trie: trie, Key: make([]byte, 32)}
|
|
}
|
|
|
|
func (self *Iterator) Next() bool {
|
|
self.trie.mu.Lock()
|
|
defer self.trie.mu.Unlock()
|
|
|
|
key := trie.RemTerm(trie.CompactHexDecode(string(self.Key)))
|
|
k := self.next(self.trie.root, key)
|
|
|
|
self.Key = []byte(trie.DecodeCompact(k))
|
|
|
|
return len(k) > 0
|
|
|
|
}
|
|
|
|
func (self *Iterator) next(node Node, key []byte) []byte {
|
|
if node == nil {
|
|
return nil
|
|
}
|
|
|
|
switch node := node.(type) {
|
|
case *FullNode:
|
|
if len(key) > 0 {
|
|
k := self.next(node.branch(key[0]), key[1:])
|
|
if k != nil {
|
|
return append([]byte{key[0]}, k...)
|
|
}
|
|
}
|
|
|
|
var r byte
|
|
if len(key) > 0 {
|
|
r = key[0] + 1
|
|
}
|
|
|
|
for i := r; i < 16; i++ {
|
|
k := self.key(node.branch(byte(i)))
|
|
if k != nil {
|
|
return append([]byte{i}, k...)
|
|
}
|
|
}
|
|
|
|
case *ShortNode:
|
|
k := trie.RemTerm(node.Key())
|
|
if vnode, ok := node.Value().(*ValueNode); ok {
|
|
if bytes.Compare([]byte(k), key) > 0 {
|
|
self.Value = vnode.Val()
|
|
return k
|
|
}
|
|
} else {
|
|
cnode := node.Value()
|
|
|
|
var ret []byte
|
|
skey := key[len(k):]
|
|
if trie.BeginsWith(key, k) {
|
|
ret = self.next(cnode, skey)
|
|
} else if bytes.Compare(k, key[:len(k)]) > 0 {
|
|
ret = self.key(node)
|
|
}
|
|
|
|
if ret != nil {
|
|
return append(k, ret...)
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (self *Iterator) key(node Node) []byte {
|
|
switch node := node.(type) {
|
|
case *ShortNode:
|
|
// Leaf node
|
|
if vnode, ok := node.Value().(*ValueNode); ok {
|
|
k := trie.RemTerm(node.Key())
|
|
self.Value = vnode.Val()
|
|
|
|
return k
|
|
} else {
|
|
k := trie.RemTerm(node.Key())
|
|
return append(k, self.key(node.Value())...)
|
|
}
|
|
case *FullNode:
|
|
if node.Value() != nil {
|
|
self.Value = node.Value().(*ValueNode).Val()
|
|
|
|
return []byte{16}
|
|
}
|
|
|
|
for i := 0; i < 16; i++ {
|
|
k := self.key(node.branch(byte(i)))
|
|
if k != nil {
|
|
return append([]byte{byte(i)}, k...)
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|