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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| package database | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
|
|
||
| "github.com/mesg-foundation/core/instance" | ||
| "github.com/syndtr/goleveldb/leveldb" | ||
| ) | ||
|
|
||
| // InstanceDB describes the API of Instance database. | ||
| type InstanceDB interface { | ||
| // Get retrives instance by instance hash. | ||
| Get(hash string) (*instance.Instance, error) | ||
|
|
||
| // Save saves instance to database. | ||
| Save(i *instance.Instance) error | ||
|
|
||
| // Delete an instance by instance hash. | ||
| Delete(hash string) error | ||
|
|
||
| // Close closes underlying database connection. | ||
| Close() error | ||
| } | ||
|
|
||
| // LevelDBInstanceDB is a database for storing services' instances. | ||
| type LevelDBInstanceDB struct { | ||
| db *leveldb.DB | ||
| } | ||
|
|
||
| // NewInstanceDB returns the database which is located under given path. | ||
| func NewInstanceDB(path string) (*LevelDBInstanceDB, error) { | ||
| db, err := leveldb.OpenFile(path, nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &LevelDBInstanceDB{db: db}, nil | ||
| } | ||
|
|
||
| // marshal returns the byte slice from service. | ||
| func (d *LevelDBInstanceDB) marshal(i *instance.Instance) ([]byte, error) { | ||
| return json.Marshal(i) | ||
| } | ||
|
|
||
| // unmarshal returns the service from byte slice. | ||
| func (d *LevelDBInstanceDB) unmarshal(id string, value []byte) (*instance.Instance, error) { | ||
| var s instance.Instance | ||
| if err := json.Unmarshal(value, &s); err != nil { | ||
| return nil, &DecodeError{ID: id} | ||
| } | ||
| return &s, nil | ||
| } | ||
|
|
||
| // Get retrives instance by instance hash. | ||
| func (d *LevelDBInstanceDB) Get(hash string) (*instance.Instance, error) { | ||
|
|
||
| b, err := d.db.Get([]byte(hash), nil) | ||
| if err != nil { | ||
| if err == leveldb.ErrNotFound { | ||
| return nil, &ErrNotFound{ID: hash} | ||
| } | ||
| return nil, err | ||
| } | ||
| return d.unmarshal(hash, b) | ||
| } | ||
|
|
||
| // Save saves instance to database. | ||
| func (d *LevelDBInstanceDB) Save(i *instance.Instance) error { | ||
| // check service | ||
| if i.Hash == "" { | ||
| return errCannotSaveWithoutHash | ||
| } | ||
|
|
||
| // encode service | ||
| b, err := d.marshal(i) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return d.db.Put([]byte(i.Hash), b, nil) | ||
| } | ||
|
|
||
| // Close closes database. | ||
| func (d *LevelDBInstanceDB) Close() error { | ||
| return d.db.Close() | ||
| } | ||
|
|
||
| // Delete deletes service from database. | ||
| func (d *LevelDBInstanceDB) Delete(hash string) error { | ||
| return d.db.Delete([]byte(hash), nil) | ||
| } |
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