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versions.go
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versions.go
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package file
import (
"path/filepath"
"time"
"encoding/binary"
"encoding/json"
bolt "github.com/etcd-io/bbolt"
)
var (
versionsBucket = []byte("versions")
)
// Structure for encapsulating a new version of configs with additional metadata
type Version struct {
Id uint64
Date time.Time
User string
Log string
Data interface{}
}
// Interface for storing and listing configs versions
type VersionsStore interface {
Put(version *Version) error
List(offset uint64, limit uint64) ([]*Version, error)
Retrieve(id uint64) (*Version, error)
}
// BoltDB implementation of the Store interface
type BoltStore struct {
FileName string
}
// Open a new store
func NewStore(configDir string) (VersionsStore, error) {
filename := filepath.Join(configDir, "configs-versions.db")
return &BoltStore{
FileName: filename,
}, nil
}
func (b *BoltStore) GetConnection() (*bolt.DB, error) {
options := bolt.DefaultOptions
options.Timeout = 2 * time.Second
db, err := bolt.Open(b.FileName, 0644, options)
if err != nil {
return nil, err
}
err = db.Update(func(tx *bolt.Tx) error {
_, e := tx.CreateBucketIfNotExists(versionsBucket)
return e
})
if err != nil {
return nil, err
}
return db, nil
}
// Put stores version in Bolt
func (b *BoltStore) Put(version *Version) error {
db, err := b.GetConnection()
if err != nil {
return err
}
defer db.Close()
return db.Update(func(tx *bolt.Tx) error {
bucket := tx.Bucket(versionsBucket)
objectId, _ := bucket.NextSequence()
version.Id = objectId
objectKey := make([]byte, 8)
binary.BigEndian.PutUint64(objectKey, objectId)
data, _ := json.Marshal(version)
return bucket.Put(objectKey, data)
})
}
// Put lists all version starting at a given id
func (b *BoltStore) List(offset uint64, limit uint64) (result []*Version, err error) {
db, er := b.GetConnection()
if er != nil {
err = er
return
}
defer db.Close()
err = db.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket(versionsBucket)
c := bucket.Cursor()
var count uint64
if offset > 0 {
offsetKey := make([]byte, 8)
binary.BigEndian.PutUint64(offsetKey, offset)
c.Seek(offsetKey)
for k, v := c.Seek(offsetKey); k != nil; k, v = c.Prev() {
var version Version
if e := json.Unmarshal(v, &version); e == nil {
result = append(result, &version)
}
count++
if count >= limit {
break
}
}
} else {
for k, v := c.Last(); k != nil; k, v = c.Prev() {
var version Version
if e := json.Unmarshal(v, &version); e == nil {
result = append(result, &version)
}
count++
if count >= limit {
break
}
}
}
return nil
})
return
}
// Retrieve loads data from db by version ID
func (b *BoltStore) Retrieve(id uint64) (*Version, error) {
db, err := b.GetConnection()
if err != nil {
return nil, err
}
defer db.Close()
var version Version
objectKey := make([]byte, 8)
binary.BigEndian.PutUint64(objectKey, id)
e := db.View(func(tx *bolt.Tx) error {
data := tx.Bucket(versionsBucket).Get(objectKey)
return json.Unmarshal(data, &version)
})
if e != nil {
return nil, e
}
return &version, nil
}