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tikv.go
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tikv.go
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package main
import (
"context"
"io/ioutil"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/store/tikv"
"github.com/sirupsen/logrus"
)
type TikvClient struct {
url string
store kv.Storage
}
func Dial(url string) (*TikvClient, error) {
logrus.SetOutput(ioutil.Discard)
store, err := tikv.Driver{}.Open(url)
if err != nil {
return nil, err
}
return &TikvClient{store: store, url: url}, nil
}
func (cli *TikvClient) Get(key []byte) ([]byte, error) {
txn, err := cli.store.Begin()
if err != nil {
return nil, err
}
val, err := txn.Get(kv.Key(key))
if err != nil {
return nil, err
}
return val, nil
}
func (cli *TikvClient) Set(key []byte, val []byte) error {
txn, err := cli.store.Begin()
if err != nil {
return err
}
err = txn.Set(kv.Key(key), val)
if err != nil {
return err
}
err = txn.Commit(context.TODO())
if err != nil {
return err
}
return nil
}
func (cli *TikvClient) Scan(begin []byte, limit int64, delete bool, each func(key, val []byte) bool) (int64, error) {
txn, err := cli.store.Begin()
if err != nil {
return 0, err
}
iter, err := txn.Seek(kv.Key(begin))
if err != nil {
return 0, err
}
total := limit
for iter.Valid() && limit != 0 {
if delete {
txn.Delete(iter.Key())
}
if !each([]byte(iter.Key()), iter.Value()) {
break
}
if err := iter.Next(); err != nil {
return total - limit, err
}
limit--
}
if err := txn.Commit(context.TODO()); err != nil {
return 0, err
}
return total - limit, nil
}
func (cli *TikvClient) Delete(key []byte) error {
txn, err := cli.store.Begin()
if err != nil {
return err
}
if err := txn.Delete(kv.Key(key)); err != nil {
return err
}
if err := txn.Commit(context.TODO()); err != nil {
return err
}
return nil
}