/
badger.go
219 lines (187 loc) · 4.73 KB
/
badger.go
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package badger
import (
"context"
"errors"
"fmt"
"time"
"github.com/dgraph-io/badger"
"github.com/safing/portbase/database/iterator"
"github.com/safing/portbase/database/query"
"github.com/safing/portbase/database/record"
"github.com/safing/portbase/database/storage"
"github.com/safing/portbase/log"
)
// Badger database made pluggable for portbase.
type Badger struct {
name string
db *badger.DB
}
func init() {
_ = storage.Register("badger", NewBadger)
}
// NewBadger opens/creates a badger database.
func NewBadger(name, location string) (storage.Interface, error) {
opts := badger.DefaultOptions(location)
db, err := badger.Open(opts)
if err == badger.ErrTruncateNeeded {
// clean up after crash
log.Warningf("database/storage: truncating corrupted value log of badger database %s: this may cause data loss", name)
opts.Truncate = true
db, err = badger.Open(opts)
}
if err != nil {
return nil, err
}
return &Badger{
name: name,
db: db,
}, nil
}
// Get returns a database record.
func (b *Badger) Get(key string) (record.Record, error) {
var item *badger.Item
err := b.db.View(func(txn *badger.Txn) error {
var err error
item, err = txn.Get([]byte(key))
if err != nil {
if err == badger.ErrKeyNotFound {
return storage.ErrNotFound
}
return err
}
return nil
})
if err != nil {
return nil, err
}
// return err if deleted or expired
if item.IsDeletedOrExpired() {
return nil, storage.ErrNotFound
}
data, err := item.ValueCopy(nil)
if err != nil {
return nil, err
}
m, err := record.NewRawWrapper(b.name, string(item.Key()), data)
if err != nil {
return nil, err
}
return m, nil
}
// Put stores a record in the database.
func (b *Badger) Put(r record.Record) (record.Record, error) {
data, err := r.MarshalRecord(r)
if err != nil {
return nil, err
}
err = b.db.Update(func(txn *badger.Txn) error {
return txn.Set([]byte(r.DatabaseKey()), data)
})
if err != nil {
return nil, err
}
return r, nil
}
// Delete deletes a record from the database.
func (b *Badger) Delete(key string) error {
return b.db.Update(func(txn *badger.Txn) error {
err := txn.Delete([]byte(key))
if err != nil && err != badger.ErrKeyNotFound {
return err
}
return nil
})
}
// Query returns a an iterator for the supplied query.
func (b *Badger) Query(q *query.Query, local, internal bool) (*iterator.Iterator, error) {
_, err := q.Check()
if err != nil {
return nil, fmt.Errorf("invalid query: %s", err)
}
queryIter := iterator.New()
go b.queryExecutor(queryIter, q, local, internal)
return queryIter, nil
}
//nolint:gocognit
func (b *Badger) queryExecutor(queryIter *iterator.Iterator, q *query.Query, local, internal bool) {
err := b.db.View(func(txn *badger.Txn) error {
it := txn.NewIterator(badger.DefaultIteratorOptions)
defer it.Close()
prefix := []byte(q.DatabaseKeyPrefix())
for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
item := it.Item()
var data []byte
err := item.Value(func(val []byte) error {
data = val
return nil
})
if err != nil {
return err
}
r, err := record.NewRawWrapper(b.name, string(item.Key()), data)
if err != nil {
return err
}
if !r.Meta().CheckValidity() {
continue
}
if !r.Meta().CheckPermission(local, internal) {
continue
}
if q.MatchesRecord(r) {
copiedData, err := item.ValueCopy(nil)
if err != nil {
return err
}
new, err := record.NewRawWrapper(b.name, r.DatabaseKey(), copiedData)
if err != nil {
return err
}
select {
case <-queryIter.Done:
return nil
case queryIter.Next <- new:
default:
select {
case queryIter.Next <- new:
case <-queryIter.Done:
return nil
case <-time.After(1 * time.Minute):
return errors.New("query timeout")
}
}
}
}
return nil
})
queryIter.Finish(err)
}
// ReadOnly returns whether the database is read only.
func (b *Badger) ReadOnly() bool {
return false
}
// Injected returns whether the database is injected.
func (b *Badger) Injected() bool {
return false
}
// Maintain runs a light maintenance operation on the database.
func (b *Badger) Maintain(_ context.Context) error {
_ = b.db.RunValueLogGC(0.7)
return nil
}
// MaintainThorough runs a thorough maintenance operation on the database.
func (b *Badger) MaintainThorough(_ context.Context) (err error) {
for err == nil {
err = b.db.RunValueLogGC(0.7)
}
return nil
}
// MaintainRecordStates maintains records states in the database.
func (b *Badger) MaintainRecordStates(ctx context.Context, purgeDeletedBefore time.Time, shadowDelete bool) error {
// TODO: implement MaintainRecordStates
return nil
}
// Shutdown shuts down the database.
func (b *Badger) Shutdown() error {
return b.db.Close()
}