mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
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237 lines
5.7 KiB
Go
237 lines
5.7 KiB
Go
// Copyright 2018 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package db implements a mock store that keeps all chunk data in LevelDB database.
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package db
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import (
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"archive/tar"
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"bytes"
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"encoding/json"
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"io"
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"io/ioutil"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/util"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/swarm/storage/mock"
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)
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// GlobalStore contains the LevelDB database that is storing
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// chunk data for all swarm nodes.
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// Closing the GlobalStore with Close method is required to
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// release resources used by the database.
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type GlobalStore struct {
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db *leveldb.DB
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}
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// NewGlobalStore creates a new instance of GlobalStore.
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func NewGlobalStore(path string) (s *GlobalStore, err error) {
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db, err := leveldb.OpenFile(path, nil)
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if err != nil {
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return nil, err
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}
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return &GlobalStore{
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db: db,
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}, nil
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}
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// Close releases the resources used by the underlying LevelDB.
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func (s *GlobalStore) Close() error {
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return s.db.Close()
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}
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// NewNodeStore returns a new instance of NodeStore that retrieves and stores
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// chunk data only for a node with address addr.
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func (s *GlobalStore) NewNodeStore(addr common.Address) *mock.NodeStore {
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return mock.NewNodeStore(addr, s)
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}
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// Get returns chunk data if the chunk with key exists for node
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// on address addr.
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func (s *GlobalStore) Get(addr common.Address, key []byte) (data []byte, err error) {
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has, err := s.db.Has(nodeDBKey(addr, key), nil)
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if err != nil {
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return nil, mock.ErrNotFound
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}
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if !has {
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return nil, mock.ErrNotFound
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}
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data, err = s.db.Get(dataDBKey(key), nil)
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if err == leveldb.ErrNotFound {
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err = mock.ErrNotFound
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}
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return
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}
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// Put saves the chunk data for node with address addr.
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func (s *GlobalStore) Put(addr common.Address, key []byte, data []byte) error {
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batch := new(leveldb.Batch)
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batch.Put(nodeDBKey(addr, key), nil)
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batch.Put(dataDBKey(key), data)
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return s.db.Write(batch, nil)
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}
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// HasKey returns whether a node with addr contains the key.
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func (s *GlobalStore) HasKey(addr common.Address, key []byte) bool {
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has, err := s.db.Has(nodeDBKey(addr, key), nil)
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if err != nil {
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has = false
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}
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return has
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}
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// Import reads tar archive from a reader that contains exported chunk data.
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// It returns the number of chunks imported and an error.
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func (s *GlobalStore) Import(r io.Reader) (n int, err error) {
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tr := tar.NewReader(r)
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for {
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hdr, err := tr.Next()
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if err != nil {
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if err == io.EOF {
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break
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}
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return n, err
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}
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data, err := ioutil.ReadAll(tr)
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if err != nil {
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return n, err
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}
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var c mock.ExportedChunk
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if err = json.Unmarshal(data, &c); err != nil {
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return n, err
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}
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batch := new(leveldb.Batch)
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for _, addr := range c.Addrs {
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batch.Put(nodeDBKeyHex(addr, hdr.Name), nil)
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}
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batch.Put(dataDBKey(common.Hex2Bytes(hdr.Name)), c.Data)
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if err = s.db.Write(batch, nil); err != nil {
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return n, err
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}
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n++
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}
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return n, err
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}
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// Export writes to a writer a tar archive with all chunk data from
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// the store. It returns the number fo chunks exported and an error.
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func (s *GlobalStore) Export(w io.Writer) (n int, err error) {
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tw := tar.NewWriter(w)
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defer tw.Close()
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buf := bytes.NewBuffer(make([]byte, 0, 1024))
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encoder := json.NewEncoder(buf)
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iter := s.db.NewIterator(util.BytesPrefix(nodeKeyPrefix), nil)
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defer iter.Release()
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var currentKey string
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var addrs []common.Address
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saveChunk := func(hexKey string) error {
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key := common.Hex2Bytes(hexKey)
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data, err := s.db.Get(dataDBKey(key), nil)
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if err != nil {
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return err
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}
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buf.Reset()
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if err = encoder.Encode(mock.ExportedChunk{
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Addrs: addrs,
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Data: data,
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}); err != nil {
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return err
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}
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d := buf.Bytes()
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hdr := &tar.Header{
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Name: hexKey,
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Mode: 0644,
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Size: int64(len(d)),
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}
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if err := tw.WriteHeader(hdr); err != nil {
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return err
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}
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if _, err := tw.Write(d); err != nil {
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return err
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}
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n++
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return nil
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}
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for iter.Next() {
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k := bytes.TrimPrefix(iter.Key(), nodeKeyPrefix)
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i := bytes.Index(k, []byte("-"))
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if i < 0 {
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continue
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}
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hexKey := string(k[:i])
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if currentKey == "" {
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currentKey = hexKey
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}
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if hexKey != currentKey {
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if err = saveChunk(currentKey); err != nil {
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return n, err
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}
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addrs = addrs[:0]
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}
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currentKey = hexKey
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addrs = append(addrs, common.BytesToAddress(k[i:]))
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}
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if len(addrs) > 0 {
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if err = saveChunk(currentKey); err != nil {
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return n, err
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}
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}
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return n, err
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}
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var (
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nodeKeyPrefix = []byte("node-")
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dataKeyPrefix = []byte("data-")
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)
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// nodeDBKey constructs a database key for key/node mappings.
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func nodeDBKey(addr common.Address, key []byte) []byte {
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return nodeDBKeyHex(addr, common.Bytes2Hex(key))
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}
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// nodeDBKeyHex constructs a database key for key/node mappings
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// using the hexadecimal string representation of the key.
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func nodeDBKeyHex(addr common.Address, hexKey string) []byte {
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return append(append(nodeKeyPrefix, []byte(hexKey+"-")...), addr[:]...)
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}
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// dataDBkey constructs a database key for key/data storage.
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func dataDBKey(key []byte) []byte {
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return append(dataKeyPrefix, key...)
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}
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