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maybe.go
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maybe.go
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// Copyright 2023 Linka Cloud All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package replication
import (
"context"
"github.com/dgraph-io/badger/v3"
"go.linka.cloud/protodb/internal/db/pending"
)
var _ Tx = (*Maybe)(nil)
type Maybe struct {
Tx
DB
readTs uint64
w pending.IterableMergedWrites
}
func (s *Maybe) Iterator(tx *badger.Txn, readTs uint64, opt badger.IteratorOptions) pending.Iterator {
if s.Tx != nil {
return s.Tx.Iterator(tx, readTs, opt)
}
return s.w.MergedIterator(tx, readTs, opt)
}
func (s *Maybe) New(ctx context.Context, readTs uint64) error {
if s.Tx != nil {
return s.Tx.New(ctx, readTs)
}
s.readTs = readTs
s.w = pending.New(s.DB.Path(), s.DB.MaxBatchCount(), s.DB.MaxBatchSize(), int(s.DB.ValueThreshold()), func(key []byte) {})
return nil
}
func (s *Maybe) Set(ctx context.Context, key, value []byte, expiresAt uint64) error {
if s.Tx != nil {
return s.Tx.Set(ctx, key, value, expiresAt)
}
s.w.Set(&badger.Entry{
Key: key,
Value: value,
ExpiresAt: expiresAt,
})
return nil
}
func (s *Maybe) Delete(ctx context.Context, key []byte) error {
if s.Tx != nil {
return s.Tx.Delete(ctx, key)
}
s.w.Delete(key)
return nil
}
func (s *Maybe) Commit(ctx context.Context, at uint64) error {
if s.Tx != nil {
return s.Tx.Commit(ctx, at)
}
b := s.DB.NewWriteBatchAt(s.readTs)
defer b.Cancel()
if err := s.w.Replay(func(e *badger.Entry) error {
if e.UserMeta != 0 {
return b.DeleteAt(e.Key, at)
}
return b.SetEntryAt(e, at)
}); err != nil {
return err
}
return b.Flush()
}
func (s *Maybe) Close(ctx context.Context) error {
if s.Tx != nil {
return s.Tx.Close(ctx)
}
if s.w != nil {
return s.w.Close()
}
return nil
}