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// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package light
import (
"errors"
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/rlp"
)
// NodeSet stores a set of trie nodes. It implements trie.Database and can also
// act as a cache for another trie.Database.
type NodeSet struct {
nodes map[string][]byte
order []string
dataSize int
lock sync.RWMutex
}
// NewNodeSet creates an empty node set
func NewNodeSet() *NodeSet {
return &NodeSet{
nodes: make(map[string][]byte),
}
}
// Put stores a new node in the set
func (db *NodeSet) Put(key []byte, value []byte) error {
db.lock.Lock()
defer db.lock.Unlock()
if _, ok := db.nodes[string(key)]; ok {
return nil
}
keystr := string(key)
db.nodes[keystr] = common.CopyBytes(value)
db.order = append(db.order, keystr)
db.dataSize += len(value)
return nil
}
// Delete removes a node from the set
func (db *NodeSet) Delete(key []byte) error {
db.lock.Lock()
defer db.lock.Unlock()
delete(db.nodes, string(key))
return nil
}
// Get returns a stored node
func (db *NodeSet) Get(key []byte) ([]byte, error) {
db.lock.RLock()
defer db.lock.RUnlock()
if entry, ok := db.nodes[string(key)]; ok {
return entry, nil
}
return nil, errors.New("not found")
}
// Has returns true if the node set contains the given key
func (db *NodeSet) Has(key []byte) (bool, error) {
_, err := db.Get(key)
return err == nil, nil
}
// KeyCount returns the number of nodes in the set
func (db *NodeSet) KeyCount() int {
db.lock.RLock()
defer db.lock.RUnlock()
return len(db.nodes)
}
// DataSize returns the aggregated data size of nodes in the set
func (db *NodeSet) DataSize() int {
db.lock.RLock()
defer db.lock.RUnlock()
return db.dataSize
}
// NodeList converts the node set to a NodeList
func (db *NodeSet) NodeList() NodeList {
db.lock.RLock()
defer db.lock.RUnlock()
var values NodeList
for _, key := range db.order {
values = append(values, db.nodes[key])
}
return values
}
// Store writes the contents of the set to the given database
func (db *NodeSet) Store(target ethdb.KeyValueWriter) {
db.lock.RLock()
defer db.lock.RUnlock()
for key, value := range db.nodes {
target.Put([]byte(key), value)
}
}
// NodeList stores an ordered list of trie nodes. It implements ethdb.KeyValueWriter.
type NodeList []rlp.RawValue
// Store writes the contents of the list to the given database
func (n NodeList) Store(db ethdb.KeyValueWriter) {
for _, node := range n {
db.Put(crypto.Keccak256(node), node)
}
}
// NodeSet converts the node list to a NodeSet
func (n NodeList) NodeSet() *NodeSet {
db := NewNodeSet()
n.Store(db)
return db
}
// Put stores a new node at the end of the list
func (n *NodeList) Put(key []byte, value []byte) error {
*n = append(*n, value)
return nil
}
// Delete panics as there's no reason to remove a node from the list.
func (n *NodeList) Delete(key []byte) error {
panic("not supported")
}
// DataSize returns the aggregated data size of nodes in the list
func (n NodeList) DataSize() int {
var size int
for _, node := range n {
size += len(node)
}
return size
}
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