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/
memory.go
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/
memory.go
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package ipfs
import (
"encoding/json"
"sync"
multihash "github.com/multiformats/go-multihash"
"github.com/pkg/errors"
)
// MemoryConnector ipmlements IPFS Connector interface with Memory storage
type MemoryConnector struct {
mutex sync.RWMutex
store map[string][]byte
}
// NewMemoryConnector creates a new MemoryConnector struct
func NewMemoryConnector() (Connector, error) {
return &MemoryConnector{
mutex: sync.RWMutex{},
store: map[string][]byte{},
}, nil
}
// Add adds data to Memory IPFS
func (m *MemoryConnector) Add(data []byte) (string, error) {
id, err := genIPFSID(data)
if err != nil {
return "", err
}
m.mutex.Lock()
m.store[id] = data
m.mutex.Unlock()
return id, nil
}
// Get gets data from Memory IPFS
func (m *MemoryConnector) Get(path string) ([]byte, error) {
m.mutex.RLock()
data, ok := m.store[path]
m.mutex.RUnlock()
if !ok {
return nil, errors.New("Key not found")
}
return data, nil
}
// AddJSON encodes data to JSON and stores it in Memory IPFS
func (m *MemoryConnector) AddJSON(data interface{}) (string, error) {
jd, err := json.Marshal(data)
if err != nil {
return "", err
}
return m.Add(jd)
}
// GetJSON gets data from IPFS and decodes it from JSON
func (m *MemoryConnector) GetJSON(path string, data interface{}) error {
jd, err := m.Get(path)
if err != nil {
return err
}
if err := json.Unmarshal(jd, data); err != nil {
return errors.Wrap(ErrDocumentNotValid, err.Error())
}
return nil
}
// GetID returns the local id
func (m *MemoryConnector) GetID() string {
return ""
}
func genIPFSID(data []byte) (string, error) {
mh, err := multihash.Sum(data, multihash.SHA2_256, 32)
if err != nil {
return "", err
}
return mh.B58String(), nil
}