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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
package txstore
import (
"context"
"encoding/json"
"fmt"
"os"
"path"
"github.com/sirupsen/logrus"
"github.com/weaviate/weaviate/usecases/cluster"
"go.etcd.io/bbolt"
)
var txBucket = []byte("transactions")
type Store struct {
db *bbolt.DB
log logrus.FieldLogger
homeDir string
unmarshaller unmarshalFn
}
func NewStore(homeDir string, logger logrus.FieldLogger) *Store {
return &Store{
homeDir: homeDir,
log: logger,
}
}
func (s *Store) SetUmarshalFn(fn unmarshalFn) {
s.unmarshaller = fn
}
func (s *Store) Open() error {
if err := os.MkdirAll(s.homeDir, 0o777); err != nil {
return fmt.Errorf("create root directory %q: %w", s.homeDir, err)
}
path := path.Join(s.homeDir, "tx.db")
boltDB, err := initBoltDB(path)
if err != nil {
return fmt.Errorf("init bolt_db: %w", err)
}
s.db = boltDB
return nil
}
func (s *Store) StoreTx(ctx context.Context, tx *cluster.Transaction) error {
data, err := json.Marshal(txWrapper{
ID: tx.ID,
Payload: tx.Payload,
Type: tx.Type,
})
if err != nil {
return fmt.Errorf("marshal tx: %w", err)
}
return s.db.Update(func(boltTx *bbolt.Tx) error {
b := boltTx.Bucket(txBucket)
return b.Put([]byte(tx.ID), data)
})
}
func (s *Store) DeleteTx(ctx context.Context, txId string) error {
return s.db.Update(func(boltTx *bbolt.Tx) error {
b := boltTx.Bucket(txBucket)
return b.Delete([]byte(txId))
})
}
func (s *Store) IterateAll(ctx context.Context,
cb func(tx *cluster.Transaction),
) error {
return s.db.View(func(boltTx *bbolt.Tx) error {
b := boltTx.Bucket(txBucket)
c := b.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
var txWrap txWrapperRead
if err := json.Unmarshal(v, &txWrap); err != nil {
return err
}
tx := cluster.Transaction{
ID: txWrap.ID,
Type: txWrap.Type,
}
pl, err := s.unmarshaller(tx.Type, txWrap.Payload)
if err != nil {
return err
}
tx.Payload = pl
cb(&tx)
}
return nil
})
}
func (s *Store) Close() error {
return nil
}
func initBoltDB(filePath string) (*bbolt.DB, error) {
db, err := bbolt.Open(filePath, 0o600, nil)
if err != nil {
return nil, fmt.Errorf("open %q: %w", filePath, err)
}
root := func(tx *bbolt.Tx) error {
_, err := tx.CreateBucketIfNotExists(txBucket)
return err
}
return db, db.Update(root)
}
type txWrapper struct {
ID string `json:"id"`
Payload any `json:"payload"`
Type cluster.TransactionType `json:"type"`
}
// delayed unmarshalling of the payload, so we can inject a specific
// marshaller
type txWrapperRead struct {
ID string `json:"id"`
Payload json.RawMessage `json:"payload"`
Type cluster.TransactionType `json:"type"`
}
type unmarshalFn func(txType cluster.TransactionType, payload json.RawMessage) (any, error)
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