98 lines
1.6 KiB
Go
98 lines
1.6 KiB
Go
package badger
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import (
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"encoding/json"
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"github.com/dgraph-io/badger/v3"
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)
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func genericSet[T any](txn *Transaction, key []byte, obj T) (err error) {
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defer func() {
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err = mapErr(err)
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}()
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valueBytes, err := json.Marshal(obj)
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if err != nil {
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return err
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}
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return txn.badgerTxn.Set(key, valueBytes)
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}
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func genericGet[T any, PT interface {
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SetVersion(uint64)
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*T
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}](txn *Transaction, key []byte) (_ *T, err error) {
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defer func() {
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err = mapErr(err)
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}()
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item, err := txn.badgerTxn.Get(key)
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if err != nil {
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return nil, err
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}
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valueBytes, err := item.ValueCopy(nil)
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if err != nil {
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return nil, err
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}
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var obj T
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err = json.Unmarshal(valueBytes, &obj)
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if err != nil {
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return nil, err
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}
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PT(&obj).SetVersion(item.Version())
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return &obj, nil
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}
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func genericList[T any, PT interface {
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SetVersion(uint64)
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*T
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}](txn *Transaction, prefix string) (_ []T, err error) {
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defer func() {
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err = mapErr(err)
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}()
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// Declare an empty, non-nil slice to
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// return [] when no objects are found
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result := []T{}
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it := txn.badgerTxn.NewIterator(badger.IteratorOptions{
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Prefix: []byte(prefix),
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})
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defer it.Close()
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for it.Rewind(); it.Valid(); it.Next() {
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item := it.Item()
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valueBytes, err := item.ValueCopy(nil)
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if err != nil {
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return nil, err
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}
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var obj T
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if err := json.Unmarshal(valueBytes, &obj); err != nil {
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return nil, err
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}
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PT(&obj).SetVersion(item.Version())
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result = append(result, obj)
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}
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return result, nil
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}
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func genericDelete(txn *Transaction, key []byte) (err error) {
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defer func() {
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err = mapErr(err)
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}()
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return txn.badgerTxn.Delete(key)
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}
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