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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
package indexcheckpoint
import (
"encoding/binary"
"path/filepath"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
bolt "go.etcd.io/bbolt"
)
var checkpointBucket = []byte("checkpoint")
// Checkpoints keeps track of the last indexed vector id for each shard.
// It stores the ids in a BoltDB file.
type Checkpoints struct {
db *bolt.DB
}
func New(dir string, logger logrus.FieldLogger) (*Checkpoints, error) {
path := filepath.Join(dir, "index.db")
db, err := bolt.Open(path, 0o600, nil)
if err != nil {
return nil, errors.Wrapf(err, "open %q", path)
}
ic := Checkpoints{
db: db,
}
err = ic.initDB()
if err != nil {
return nil, err
}
return &ic, nil
}
func (c *Checkpoints) initDB() error {
err := c.db.Update(func(tx *bolt.Tx) error {
_, err := tx.CreateBucketIfNotExists(checkpointBucket)
return err
})
return errors.Wrap(err, "init db")
}
// Close the underlying DB
func (c *Checkpoints) Close() {
c.db.Close()
}
func (c *Checkpoints) Get(shardID string) (uint64, error) {
var count uint64
err := c.db.View(func(tx *bolt.Tx) error {
b := tx.Bucket(checkpointBucket)
v := b.Get([]byte(shardID))
if v == nil {
return nil
}
count = binary.LittleEndian.Uint64(v)
return nil
})
if err != nil {
return 0, errors.Wrap(err, "get checkpoint")
}
return count, nil
}
func (c *Checkpoints) Update(shardID string, id uint64) error {
buf := make([]byte, 8)
binary.LittleEndian.PutUint64(buf, id)
err := c.db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket(checkpointBucket)
return b.Put([]byte(shardID), buf)
})
if err != nil {
return errors.Wrap(err, "update checkpoint")
}
return nil
}
func (c *Checkpoints) Delete(shardID string) error {
err := c.db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket(checkpointBucket)
return b.Delete([]byte(shardID))
})
if err != nil {
return errors.Wrap(err, "delete checkpoint")
}
return nil
}
func (c *Checkpoints) Filename() string {
return c.db.Path()
}
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