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pebble.go
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pebble.go
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/*
* Copyright 2024 Function Stream Org.
*
* 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 statestore
import (
"log/slog"
"os"
"github.com/cockroachdb/pebble"
"github.com/functionstream/function-stream/fs/api"
"github.com/pkg/errors"
)
type PebbleStateStore struct {
api.StateStore
log *slog.Logger
db *pebble.DB
}
type PebbleStateStoreConfig struct {
DirName string
}
func NewTmpPebbleStateStore() (api.StateStore, error) {
dir, err := os.MkdirTemp("", "")
if err != nil {
return nil, err
}
store, err := NewPebbleStateStore(&PebbleStateStoreConfig{DirName: dir}, slog.Default())
if err != nil {
return nil, err
}
return store, nil
}
func NewPebbleStateStore(config *PebbleStateStoreConfig, logger *slog.Logger) (*PebbleStateStore, error) {
log := logger.With(slog.String("component", "pebble-state-store"))
log.Info("Creating pebble state store", slog.String("dir", config.DirName))
db, err := pebble.Open(config.DirName, &pebble.Options{})
if err != nil {
return nil, err
}
return &PebbleStateStore{
log: log,
db: db,
}, nil
}
func (s *PebbleStateStore) PutState(key string, value []byte) error {
s.log.Debug("PutState", slog.String("key", key))
if err := s.db.Set([]byte(key), value, pebble.NoSync); err != nil {
return err
}
return nil
}
func (s *PebbleStateStore) GetState(key string) ([]byte, error) {
s.log.Debug("GetState", slog.String("key", key))
value, closer, err := s.db.Get([]byte(key))
if err != nil {
if errors.Is(err, pebble.ErrNotFound) {
return nil, api.ErrNotFound
}
return nil, err
}
result := make([]byte, len(value))
copy(result, value)
if err := closer.Close(); err != nil {
return nil, err
}
return result, nil
}
func (s *PebbleStateStore) Close() error {
return s.db.Close()
}