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store.go
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store.go
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// Copyright 2016 The NorthShore Authors All rights reserved.
//
// Licensed 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 boltdbstore
import (
"encoding/json"
"errors"
"os"
"github.com/boltdb/bolt"
)
// Stored defines collection interface
type Stored interface {
// Bucket returns the bucket name
Bucket() []byte
// Next is an iterator, takes key and returns pointer to item instance
Next([]byte) interface{}
}
// GetStored loads all items from boltdb Bucket
func GetStored(items Stored) (err error) {
bucket := items.Bucket()
db, err := openBucket(bucket)
if err != nil {
return
}
defer db.Close()
err = db.View(func(tx *bolt.Tx) error {
b := tx.Bucket(bucket)
b.ForEach(func(k, v []byte) error {
if err := json.Unmarshal(v, items.Next(k)); err != nil {
return err
}
return nil
})
return nil
})
return
}
// Delete deletes key from boltdb Bucket
func Delete(bucket []byte, key []byte) error {
db, err := openBucket(bucket)
if err != nil {
return err
}
defer db.Close()
if err := db.Update(func(tx *bolt.Tx) error {
return tx.Bucket(bucket).Delete(key)
}); err != nil {
return err
}
return nil
}
// Get gets item from boltdb Bucket
func Get(bucket []byte, key []byte, v interface{}) (err error) {
db, err := openBucket(bucket)
if err != nil {
return
}
defer db.Close()
err = db.View(func(tx *bolt.Tx) error {
b := tx.Bucket(bucket)
buf := b.Get(key)
if buf == nil {
return errors.New("Key does not exist or key is a nested bucket")
}
if err := json.Unmarshal(buf, &v); err != nil {
return err
}
return nil
})
return
}
// Put puts item into boltdb Bucket as JSON
func Put(bucket []byte, key []byte, v interface{}) (err error) {
db, err := openBucket(bucket)
if err != nil {
return
}
defer db.Close()
err = db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket(bucket)
vEncoded, err := json.Marshal(v)
if err != nil {
return err
}
if err := b.Put(key, vEncoded); err != nil {
return err
}
return nil
})
return
}
func openBucket(bucket []byte) (*bolt.DB, error) {
path := os.Getenv("BOLTDB_PATH")
db, err := bolt.Open(path, 0600, nil)
if err != nil {
return nil, err
}
if err = db.Update(func(tx *bolt.Tx) error {
_, err = tx.CreateBucketIfNotExists(bucket)
if err != nil {
return err
}
return nil
}); err != nil {
return nil, err
}
return db, nil
}