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versions.go
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versions.go
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/*
* Copyright (c) 2019-2022 Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
package filex
import (
"fmt"
"path/filepath"
"time"
"encoding/binary"
"github.com/bep/debounce"
bolt "go.etcd.io/bbolt"
"go.uber.org/zap"
"github.com/pydio/cells/v4/common/config/revisions"
json "github.com/pydio/cells/v4/common/utils/jsonx"
)
var (
versionsBucket = []byte("versions")
)
// BoltStore is a BoltDB implementation of the Store interface
type BoltStore struct {
FileName string
debouncer func(f func())
versions chan *revisions.Version
}
// NewRevisionsStore opens a new store
func NewRevisionsStore(configDir string, debounceTime ...time.Duration) revisions.Store {
filename := filepath.Join(configDir, "configs-versions.db")
bs := &BoltStore{
FileName: filename,
versions: make(chan *revisions.Version, 100),
}
if len(debounceTime) > 0 {
bs.debouncer = debounce.New(debounceTime[0])
}
return bs
}
func (b *BoltStore) GetConnection(readOnly bool) (*bolt.DB, error) {
options := bolt.DefaultOptions
options.Timeout = 10 * time.Second
options.ReadOnly = readOnly
db, err := bolt.Open(b.FileName, 0644, options)
if err != nil {
return nil, err
}
if !readOnly {
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) flush() {
db, err := b.GetConnection(false)
if err != nil {
// TODO logs
fmt.Println("[Configs Versions] no connection", zap.Error(err))
return
}
defer db.Close()
if err := db.Update(func(tx *bolt.Tx) error {
for {
select {
case version := <-b.versions:
bucket := tx.Bucket(versionsBucket)
objectId, _ := bucket.NextSequence()
version.Id = objectId
objectKey := make([]byte, 8)
binary.BigEndian.PutUint64(objectKey, objectId)
data, _ := json.Marshal(version)
if err := bucket.Put(objectKey, data); err != nil {
return err
}
case <-time.After(100 * time.Millisecond):
return nil
}
}
}); err != nil {
fmt.Println("[Configs Versions] could not update", zap.Error(err))
}
}
func (b *BoltStore) Put(version *revisions.Version) error {
b.versions <- version
if b.debouncer != nil {
b.debouncer(b.flush)
} else {
b.flush()
}
return nil
}
// List lists all version starting at a given id
func (b *BoltStore) List(offset uint64, limit uint64) (result []*revisions.Version, err error) {
db, er := b.GetConnection(true)
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 revisions.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 revisions.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) (*revisions.Version, error) {
db, err := b.GetConnection(true)
if err != nil {
return nil, err
}
defer db.Close()
var version revisions.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
}