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txnkv.go
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txnkv.go
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// Copyright 2021 TiKV Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"context"
"flag"
"fmt"
"os"
"github.com/tikv/client-go/v2/txnkv"
)
// KV represents a Key-Value pair.
type KV struct {
K, V []byte
}
func (kv KV) String() string {
return fmt.Sprintf("%s => %s (%v)", kv.K, kv.V, kv.V)
}
var (
client *txnkv.Client
pdAddr = flag.String("pd", "127.0.0.1:2379", "pd address")
)
// Init initializes information.
func initStore() {
var err error
client, err = txnkv.NewClient([]string{*pdAddr})
if err != nil {
panic(err)
}
}
// key1 val1 key2 val2 ...
func puts(args ...[]byte) error {
tx, err := client.Begin()
if err != nil {
return err
}
for i := 0; i < len(args); i += 2 {
key, val := args[i], args[i+1]
err := tx.Set(key, val)
if err != nil {
return err
}
}
return tx.Commit(context.Background())
}
func get(k []byte) (KV, error) {
tx, err := client.Begin()
if err != nil {
return KV{}, err
}
v, err := tx.Get(context.TODO(), k)
if err != nil {
return KV{}, err
}
return KV{K: k, V: v}, nil
}
func dels(keys ...[]byte) error {
tx, err := client.Begin()
if err != nil {
return err
}
for _, key := range keys {
err := tx.Delete(key)
if err != nil {
return err
}
}
return tx.Commit(context.Background())
}
func scan(keyPrefix []byte, limit int) ([]KV, error) {
tx, err := client.Begin()
if err != nil {
return nil, err
}
it, err := tx.Iter(keyPrefix, nil)
if err != nil {
return nil, err
}
defer it.Close()
var ret []KV
for it.Valid() && limit > 0 {
ret = append(ret, KV{K: it.Key()[:], V: it.Value()[:]})
limit--
it.Next()
}
return ret, nil
}
func main() {
pdAddr := os.Getenv("PD_ADDR")
if pdAddr != "" {
os.Args = append(os.Args, "-pd", pdAddr)
}
flag.Parse()
initStore()
// set
err := puts([]byte("key1"), []byte("value1"), []byte("key2"), []byte("value2"))
if err != nil {
panic(err)
}
// get
kv, err := get([]byte("key1"))
if err != nil {
panic(err)
}
fmt.Println(kv)
// scan
ret, err := scan([]byte("key"), 10)
if err != nil {
panic(err)
}
for _, kv := range ret {
fmt.Println(kv)
}
// delete
err = dels([]byte("key1"), []byte("key2"))
if err != nil {
panic(err)
}
}