mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
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176 lines
4.4 KiB
Go
176 lines
4.4 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 mem implements a mock store that keeps all chunk data in memory.
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// While it can be used for testing on smaller scales, the main purpose of this
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// package is to provide the simplest reference implementation of a mock store.
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package mem
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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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"sync"
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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 stores all chunk data and also keys and node addresses relations.
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// It implements mock.GlobalStore interface.
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type GlobalStore struct {
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nodes map[string]map[common.Address]struct{}
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data map[string][]byte
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mu sync.Mutex
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}
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// NewGlobalStore creates a new instance of GlobalStore.
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func NewGlobalStore() *GlobalStore {
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return &GlobalStore{
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nodes: make(map[string]map[common.Address]struct{}),
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data: make(map[string][]byte),
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}
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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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s.mu.Lock()
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defer s.mu.Unlock()
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if _, ok := s.nodes[string(key)][addr]; !ok {
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return nil, mock.ErrNotFound
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}
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data, ok := s.data[string(key)]
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if !ok {
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return nil, mock.ErrNotFound
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}
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return data, nil
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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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s.mu.Lock()
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defer s.mu.Unlock()
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if _, ok := s.nodes[string(key)]; !ok {
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s.nodes[string(key)] = make(map[common.Address]struct{})
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}
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s.nodes[string(key)][addr] = struct{}{}
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s.data[string(key)] = data
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return 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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s.mu.Lock()
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defer s.mu.Unlock()
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_, ok := s.nodes[string(key)][addr]
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return ok
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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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s.mu.Lock()
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defer s.mu.Unlock()
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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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addrs := make(map[common.Address]struct{})
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for _, a := range c.Addrs {
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addrs[a] = struct{}{}
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}
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key := string(common.Hex2Bytes(hdr.Name))
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s.nodes[key] = addrs
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s.data[key] = c.Data
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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 of chunks exported and an error.
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func (s *GlobalStore) Export(w io.Writer) (n int, err error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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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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for key, addrs := range s.nodes {
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al := make([]common.Address, 0, len(addrs))
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for a := range addrs {
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al = append(al, a)
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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: al,
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Data: s.data[key],
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}); err != nil {
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return n, err
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}
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data := buf.Bytes()
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hdr := &tar.Header{
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Name: common.Bytes2Hex([]byte(key)),
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Mode: 0644,
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Size: int64(len(data)),
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}
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if err := tw.WriteHeader(hdr); err != nil {
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return n, err
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}
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if _, err := tw.Write(data); 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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