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/* Vuls - Vulnerability Scanner
Copyright (C) 2016 Future Corporation , Japan.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cache
import (
"encoding/json"
"time"
"github.com/boltdb/bolt"
"github.com/future-architect/vuls/util"
"github.com/sirupsen/logrus"
"golang.org/x/xerrors"
)
// Bolt holds a pointer of bolt.DB
// boltdb is used to store a cache of Changelogs of Ubuntu/Debian
type Bolt struct {
Path string
Log *logrus.Entry
db *bolt.DB
}
// SetupBolt opens a boltdb and creates a meta bucket if not exists.
func SetupBolt(path string, l *logrus.Entry) error {
l.Infof("Open boltDB: %s", path)
db, err := bolt.Open(path, 0600, nil)
if err != nil {
return err
}
b := Bolt{
Path: path,
Log: l,
db: db,
}
if err = b.createBucketIfNotExists(metabucket); err != nil {
return err
}
DB = b
return nil
}
// Close a db.
func (b Bolt) Close() error {
if b.db == nil {
return nil
}
return b.db.Close()
}
// CreateBucketIfNotExists creates a buket that is specified by arg.
func (b *Bolt) createBucketIfNotExists(name string) error {
return b.db.Update(func(tx *bolt.Tx) error {
_, err := tx.CreateBucketIfNotExists([]byte(name))
if err != nil {
return xerrors.Errorf("Failed to create bucket: %w", err)
}
return nil
})
}
// GetMeta gets a Meta Information os the servername to boltdb.
func (b Bolt) GetMeta(serverName string) (meta Meta, found bool, err error) {
err = b.db.View(func(tx *bolt.Tx) error {
bkt := tx.Bucket([]byte(metabucket))
v := bkt.Get([]byte(serverName))
if len(v) == 0 {
found = false
return nil
}
if e := json.Unmarshal(v, &meta); e != nil {
return e
}
found = true
return nil
})
return
}
// RefreshMeta gets a Meta Information os the servername to boltdb.
func (b Bolt) RefreshMeta(meta Meta) error {
meta.CreatedAt = time.Now()
jsonBytes, err := json.Marshal(meta)
if err != nil {
return xerrors.Errorf("Failed to marshal to JSON: %w", err)
}
return b.db.Update(func(tx *bolt.Tx) error {
bkt := tx.Bucket([]byte(metabucket))
if err := bkt.Put([]byte(meta.Name), jsonBytes); err != nil {
return err
}
b.Log.Debugf("Refreshed Meta: %s", meta.Name)
return nil
})
}
// EnsureBuckets puts a Meta information and create a buket that holds changelogs.
func (b Bolt) EnsureBuckets(meta Meta) error {
jsonBytes, err := json.Marshal(meta)
if err != nil {
return xerrors.Errorf("Failed to marshal to JSON: %w", err)
}
return b.db.Update(func(tx *bolt.Tx) error {
b.Log.Debugf("Put to meta: %s", meta.Name)
bkt := tx.Bucket([]byte(metabucket))
if err := bkt.Put([]byte(meta.Name), jsonBytes); err != nil {
return err
}
// re-create a bucket (bucket name: servername)
bkt = tx.Bucket([]byte(meta.Name))
if bkt != nil {
b.Log.Debugf("Delete bucket: %s", meta.Name)
if err := tx.DeleteBucket([]byte(meta.Name)); err != nil {
return err
}
b.Log.Debugf("Bucket deleted: %s", meta.Name)
}
b.Log.Debugf("Create bucket: %s", meta.Name)
if _, err := tx.CreateBucket([]byte(meta.Name)); err != nil {
return err
}
b.Log.Debugf("Bucket created: %s", meta.Name)
return nil
})
}
// PrettyPrint is for debug
func (b Bolt) PrettyPrint(meta Meta) error {
return b.db.View(func(tx *bolt.Tx) error {
bkt := tx.Bucket([]byte(metabucket))
v := bkt.Get([]byte(meta.Name))
b.Log.Debugf("Meta: key:%s, value:%s", meta.Name, v)
bkt = tx.Bucket([]byte(meta.Name))
c := bkt.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
b.Log.Debugf("key:%s, len: %d, %s...",
k, len(v), util.Truncate(string(v), 30))
}
return nil
})
}
// GetChangelog get the changelgo of specified packName from the Bucket
func (b Bolt) GetChangelog(servername, packName string) (changelog string, err error) {
err = b.db.View(func(tx *bolt.Tx) error {
bkt := tx.Bucket([]byte(servername))
if bkt == nil {
return xerrors.Errorf("Failed to get Bucket: %s", servername)
}
v := bkt.Get([]byte(packName))
if v == nil {
changelog = ""
return nil
}
changelog = string(v)
return nil
})
return
}
// PutChangelog put the changelgo of specified packName into the Bucket
func (b Bolt) PutChangelog(servername, packName, changelog string) error {
return b.db.Update(func(tx *bolt.Tx) error {
bkt := tx.Bucket([]byte(servername))
if bkt == nil {
return xerrors.Errorf("Failed to get Bucket: %s", servername)
}
return bkt.Put([]byte(packName), []byte(changelog))
})
}
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