/
bolt.go
113 lines (100 loc) · 2.29 KB
/
bolt.go
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package bolt
import (
"errors"
"fmt"
"path/filepath"
"github.com/WindomZ/gkv"
"github.com/boltdb/bolt"
)
// KV is boltdb/bolt adapter.
type KV struct {
db *bolt.DB
table []byte
}
// Open creates a new bolt driver by storage file path.
// paths are storage file paths.
func Open(paths ...string) gkv.KV {
var path string
if len(paths) != 0 {
path = paths[0]
} else {
path = filepath.Join(gkv.ProjectDir(), "data", "data.db")
}
db, err := bolt.Open(path, 0600, nil)
if err != nil {
panic(err)
}
return &KV{
db: db,
table: []byte(gkv.DefaultTableName),
}
}
// DB returns the native DB of the adapter.
func (kv KV) DB() interface{} {
return kv.db
}
// Close releases all database resources.
func (kv *KV) Close() error {
return kv.db.Close()
}
// Register initializes a new database if it doesn't already exist.
func (kv *KV) Register(table []byte) error {
if len(table) == 0 {
return gkv.ErrTableName
}
kv.table = table
return kv.db.Update(func(tx *bolt.Tx) error {
_, err := tx.CreateBucketIfNotExists(table)
if err != nil {
return fmt.Errorf("CreateBucketIfNotExists error: %s",
err.Error())
}
return nil
})
}
// Put sets the value for a key.
func (kv *KV) Put(key, value []byte) error {
return kv.db.Update(func(tx *bolt.Tx) error {
return tx.Bucket(kv.table).Put(key, value)
})
}
// Get retrieves the value for a key.
func (kv *KV) Get(key []byte) (value []byte) {
kv.db.View(func(tx *bolt.Tx) error {
value = tx.Bucket(kv.table).Get(key)
return nil
})
return
}
// Delete deletes the given key from the database resources.
func (kv *KV) Delete(key []byte) error {
return kv.db.Update(func(tx *bolt.Tx) error {
return tx.Bucket(kv.table).Delete(key)
})
}
// Count returns the total number of all the keys.
func (kv *KV) Count() (i int) {
kv.db.View(func(tx *bolt.Tx) error {
c := tx.Bucket(kv.table).Cursor()
for k, _ := c.First(); k != nil; k, _ = c.Next() {
i++
}
return nil
})
return
}
// Iterator creates an iterator for iterating over all the keys.
func (kv *KV) Iterator(f func([]byte, []byte) bool) error {
return kv.db.View(func(tx *bolt.Tx) error {
tx.Bucket(kv.table).ForEach(func(k, v []byte) error {
if k == nil || f(k, v) {
return nil
}
return errors.New("stop")
})
return nil
})
}
func init() {
gkv.Register(Open)
}