95 lines
2.3 KiB
Go
95 lines
2.3 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 state
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import (
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"encoding"
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"encoding/json"
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"sync"
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)
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// InmemoryStore is the reference implementation of Store interface that is supposed
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// to be used in tests.
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type InmemoryStore struct {
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db map[string][]byte
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mu sync.RWMutex
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}
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// NewInmemoryStore returns a new instance of InmemoryStore.
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func NewInmemoryStore() *InmemoryStore {
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return &InmemoryStore{
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db: make(map[string][]byte),
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}
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}
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// Get retrieves a value stored for a specific key. If there is no value found,
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// ErrNotFound is returned.
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func (s *InmemoryStore) Get(key string, i interface{}) (err error) {
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s.mu.RLock()
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defer s.mu.RUnlock()
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bytes, ok := s.db[key]
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if !ok {
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return ErrNotFound
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}
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unmarshaler, ok := i.(encoding.BinaryUnmarshaler)
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if !ok {
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return json.Unmarshal(bytes, i)
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}
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return unmarshaler.UnmarshalBinary(bytes)
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}
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// Put stores a value for a specific key.
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func (s *InmemoryStore) Put(key string, i interface{}) (err error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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bytes := []byte{}
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marshaler, ok := i.(encoding.BinaryMarshaler)
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if !ok {
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if bytes, err = json.Marshal(i); err != nil {
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return err
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}
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} else {
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if bytes, err = marshaler.MarshalBinary(); err != nil {
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return err
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}
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}
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s.db[key] = bytes
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return nil
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}
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// Delete removes value stored under a specific key.
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func (s *InmemoryStore) Delete(key string) (err error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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if _, ok := s.db[key]; !ok {
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return ErrNotFound
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}
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delete(s.db, key)
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return nil
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}
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// Close does not do anything.
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func (s *InmemoryStore) Close() error {
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return nil
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}
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