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factory.go
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factory.go
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package persist
import (
"fmt"
"os"
"path/filepath"
"sync"
)
// KV key-value pair
type KV struct {
Key []byte
Value []byte
}
// Database persistence interfaces
type Database interface {
Sequence() (uint64, error)
// Put(key, value []byte) error
Get(key []byte) ([]byte, error)
// Fetch(offset []byte) ([]byte, []byte, error)
Delete(key []byte) error
Clean(timestamp uint64) (uint64, error)
Close()
BatchPut(kvs []*KV) error
BatchPutV(vs [][]byte) error
BatchFetch(offset []byte, size int) ([]*KV, error)
BucketPut(bucket, key, value []byte) error
BucketGet(bucket, key []byte) ([]byte, error)
BucketList(bucket []byte) (map[string][]byte, error)
BucketDelete(bucket, key []byte) error
}
// Factory persistence factory
type Factory struct {
dir string
dbs map[string]Database
sync.Mutex
}
// NewFactory creates a persistence factory
func NewFactory(dir string) (*Factory, error) {
err := os.MkdirAll(dir, 0755)
if err != nil {
return nil, fmt.Errorf("failed to make dir (%s): %s", dir, err.Error())
}
return &Factory{dir: dir, dbs: make(map[string]Database)}, nil
}
// NewDB creates a persistence database
func (f *Factory) NewDB(name string) (Database, error) {
if name == "" {
return nil, fmt.Errorf("name (%s) invalid", name)
}
f.Lock()
defer f.Unlock()
if db, ok := f.dbs[name]; ok {
return db, nil
}
db, err := NewBoltDB(filepath.Join(f.dir, name))
if err != nil {
return nil, err
}
f.dbs[name] = db
return db, nil
}
// Close close factory to release all databases
func (f *Factory) Close() {
f.Lock()
defer f.Unlock()
for _, db := range f.dbs {
db.Close()
}
}