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package etcddb
import (
"github.com/aptly-dev/aptly/database"
clientv3 "go.etcd.io/etcd/client/v3"
)
type transaction struct {
s *EtcDStorage
tmpdb database.Storage
ops []clientv3.Op
}
// Get implements database.Reader interface.
func (t *transaction) Get(key []byte) (value []byte, err error) {
value, err = t.tmpdb.Get(key)
// if not found, search main db
if err != nil {
value, err = t.s.Get(key)
}
return
}
// Put implements database.Writer interface.
func (t *transaction) Put(key, value []byte) (err error) {
err = t.tmpdb.Put(key, value)
if err != nil {
return
}
t.ops = append(t.ops, clientv3.OpPut(string(key), string(value)))
return
}
// Delete implements database.Writer interface.
func (t *transaction) Delete(key []byte) (err error) {
err = t.tmpdb.Delete(key)
if err != nil {
return
}
t.ops = append(t.ops, clientv3.OpDelete(string(key)))
return
}
func (t *transaction) Commit() (err error) {
kv := clientv3.NewKV(t.s.db)
batchSize := 128
for i := 0; i < len(t.ops); i += batchSize {
txn := kv.Txn(Ctx)
end := i + batchSize
if end > len(t.ops) {
end = len(t.ops)
}
batch := t.ops[i:end]
txn.Then(batch...)
_, err = txn.Commit()
if err != nil {
panic(err)
}
}
t.ops = []clientv3.Op{}
return
}
// Discard is safe to call after Commit(), it would be no-op
func (t *transaction) Discard() {
t.ops = []clientv3.Op{}
_ = t.tmpdb.Drop()
}
// transaction should implement database.Transaction
var _ database.Transaction = &transaction{}
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