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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| package remember | ||
|
|
||
| import ( | ||
| "github.com/dgraph-io/badger/v3" | ||
| "time" | ||
| ) | ||
|
|
||
| // BadgerCache is the type for a Badger database cache. | ||
| type BadgerCache struct { | ||
| Conn *badger.DB | ||
| Prefix string | ||
| } | ||
|
|
||
| func (b *BadgerCache) Has(str string) bool { | ||
| _, err := b.Get(str) | ||
| if err != nil { | ||
| return false | ||
| } | ||
| return true | ||
| } | ||
|
|
||
| // Close closes the badger database. | ||
| func (b *BadgerCache) Close() error { | ||
| return b.Conn.Close() | ||
| } | ||
|
|
||
| // Get attempts to retrieve a value from the cache. | ||
| func (b *BadgerCache) Get(str string) (any, error) { | ||
| var fromCache []byte | ||
|
|
||
| err := b.Conn.View(func(txn *badger.Txn) error { | ||
| item, err := txn.Get([]byte(str)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| err = item.Value(func(val []byte) error { | ||
| fromCache = append([]byte{}, val...) | ||
| return nil | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| decoded, err := decode(string(fromCache)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| item := decoded[str] | ||
|
|
||
| return item, nil | ||
| } | ||
|
|
||
| // Set puts a value into Badger. The final parameter, expires, is optional. | ||
| func (b *BadgerCache) Set(str string, value any, expires ...time.Duration) error { | ||
| entry := CacheEntry{} | ||
|
|
||
| entry[str] = value | ||
| encoded, err := encode(entry) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if len(expires) > 0 { | ||
| err = b.Conn.Update(func(txn *badger.Txn) error { | ||
| e := badger.NewEntry([]byte(str), encoded).WithTTL(expires[0]) | ||
| err = txn.SetEntry(e) | ||
| return err | ||
| }) | ||
| } else { | ||
| err = b.Conn.Update(func(txn *badger.Txn) error { | ||
| e := badger.NewEntry([]byte(str), encoded) | ||
| err = txn.SetEntry(e) | ||
| return err | ||
| }) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // Forget removes an item from the cache, by key. | ||
| func (b *BadgerCache) Forget(str string) error { | ||
| err := b.Conn.Update(func(txn *badger.Txn) error { | ||
| err := txn.Delete([]byte(str)) | ||
| return err | ||
| }) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| // EmptyByMatch removes all entries in Redis which have the prefix match. | ||
| func (b *BadgerCache) EmptyByMatch(str string) error { | ||
| return b.emptyByMatch(str) | ||
| } | ||
|
|
||
| // Empty removes all entries in Badger. | ||
| func (b *BadgerCache) Empty() error { | ||
| return b.emptyByMatch("") | ||
| } | ||
|
|
||
| func (b *BadgerCache) emptyByMatch(str string) error { | ||
| deleteKeys := func(keysForDelete [][]byte) error { | ||
| if err := b.Conn.Update(func(txn *badger.Txn) error { | ||
| for _, key := range keysForDelete { | ||
| if err := txn.Delete(key); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| }); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| collectSize := 100000 | ||
|
|
||
| err := b.Conn.View(func(txn *badger.Txn) error { | ||
| opts := badger.DefaultIteratorOptions | ||
| opts.AllVersions = false | ||
| opts.PrefetchValues = false | ||
| it := txn.NewIterator(opts) | ||
| defer it.Close() | ||
|
|
||
| keysForDelete := make([][]byte, 0, collectSize) | ||
| keysCollected := 0 | ||
|
|
||
| for it.Seek([]byte(str)); it.ValidForPrefix([]byte(str)); it.Next() { | ||
| key := it.Item().KeyCopy(nil) | ||
| keysForDelete = append(keysForDelete, key) | ||
| keysCollected++ | ||
| if keysCollected == collectSize { | ||
| if err := deleteKeys(keysForDelete); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if keysCollected > 0 { | ||
| if err := deleteKeys(keysForDelete); err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| }) | ||
|
|
||
| return err | ||
| } | ||
|
|
||
| // GetInt is a convenience method which retrieves a value from the cache, converts it to an int, and returns it. | ||
| func (b *BadgerCache) GetInt(key string) (int, error) { | ||
| val, err := b.Get(key) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
|
|
||
| return val.(int), nil | ||
| } | ||
|
|
||
| // GetString is a convenience method which retrieves a value from the cache and returns it as a string. | ||
| func (b *BadgerCache) GetString(key string) (string, error) { | ||
| s, err := b.Get(key) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return s.(string), nil | ||
| } | ||
|
|
||
| // GetTime retrieves a value from the cache by the specified key and returns it as time.Time. | ||
| func (b *BadgerCache) GetTime(key string) (time.Time, error) { | ||
| fromCache, err := b.Get(key) | ||
| if err != nil { | ||
| return time.Time{}, err | ||
| } | ||
|
|
||
| t := fromCache.(time.Time) | ||
| return t, nil | ||
| } |
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