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kv.go
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kv.go
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package db
import (
"context"
"encoding/base64"
"errors"
"sync"
"time"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/mvcc/mvccpb"
log "github.com/sirupsen/logrus"
"go.etcd.io/etcd/clientv3/concurrency"
"github.com/wujie1993/kube-framework/pkg/e"
"github.com/wujie1993/kube-framework/pkg/setting"
)
const (
KVActionTypeSet = "set"
KVActionTypeDelete = "delete"
)
var KV KVStorage
var ClientV3 *clientv3.Client
type KVStorage interface {
Get(string) (string, error)
Set(string, string) error
List(string, bool) (map[string]string, error)
Delete(string) (string, error)
Range(string, string) (map[string]string, error)
Watch(context.Context, string, bool) <-chan KVAction
Lock(context.Context, string) error
Unlock(context.Context, string) error
}
type KVAction struct {
Key string
Value string
ActionType string
}
type EtcdClient struct {
client *clientv3.Client
endpoints string
timeout time.Duration
retryTimes int
kvMutexMap map[string]KVMutex
kvMutexMapMutex sync.Mutex
}
type KVMutex struct {
session *concurrency.Session
mutex *concurrency.Mutex
}
func InitKV() error {
etcdCli, err := NewEtcdClient(setting.EtcdSetting.Endpoints)
if err != nil {
return err
}
KV = etcdCli
ClientV3 = etcdCli.client
return nil
}
func NewEtcdClient(endpoints []string) (*EtcdClient, error) {
cli, err := clientv3.New(clientv3.Config{
Endpoints: endpoints,
DialTimeout: 5 * time.Second,
})
if err != nil {
return nil, err
}
etcdClient := &EtcdClient{
client: cli,
timeout: time.Duration(5 * time.Second),
retryTimes: 3,
kvMutexMap: make(map[string]KVMutex),
}
return etcdClient, nil
}
func (c *EtcdClient) Get(key string) (string, error) {
for retry := 0; retry < c.retryTimes; retry++ {
ctx, _ := context.WithTimeout(context.Background(), c.timeout)
resp, err := c.client.Get(ctx, key)
if err != nil {
switch err {
case context.DeadlineExceeded:
log.Warn(err)
// 出现超时错误时进行重试
continue
default:
log.Error(err)
return "", err
}
}
if resp.Count < 1 {
return "", nil
}
valueBytes, err := base64.RawStdEncoding.DecodeString(string(resp.Kvs[0].Value))
if err != nil {
return "", err
}
return string(valueBytes), nil
}
return "", errors.New("failed to get " + key)
}
func (c *EtcdClient) Range(begin string, end string) (map[string]string, error) {
for retry := 0; retry < c.retryTimes; retry++ {
ctx, _ := context.WithTimeout(context.Background(), c.timeout)
resp, err := c.client.Get(ctx, begin, clientv3.WithRange(end))
if err != nil {
switch err {
case context.DeadlineExceeded:
log.Warn(err)
// 出现超时错误时进行重试
continue
default:
log.Error(err)
return nil, err
}
}
result := make(map[string]string)
for _, kvs := range resp.Kvs {
valueBytes, err := base64.RawStdEncoding.DecodeString(string(kvs.Value))
if err != nil {
return nil, err
}
result[string(kvs.Key)] = string(valueBytes)
}
return result, nil
}
return nil, errors.New("failed to range " + begin + " to " + end)
}
func (c *EtcdClient) Set(key string, value string) error {
base64Value := base64.RawStdEncoding.EncodeToString([]byte(value))
for retry := 0; retry < c.retryTimes; retry++ {
ctx, _ := context.WithTimeout(context.Background(), c.timeout)
if _, err := c.client.Put(ctx, key, base64Value); err != nil {
switch err {
case context.DeadlineExceeded:
log.Warn(err)
// 出现超时错误时进行重试
continue
default:
log.Error(err)
return err
}
}
return nil
}
return errors.New("failed to set " + key)
}
func (c *EtcdClient) Delete(key string) (string, error) {
for retry := 0; retry < c.retryTimes; retry++ {
ctx, _ := context.WithTimeout(context.Background(), c.timeout)
resp, err := c.client.Delete(ctx, key, clientv3.WithPrevKV())
if err != nil {
switch err {
case context.DeadlineExceeded:
log.Warn(err)
// 出现超时错误时进行重试
continue
default:
log.Error(err)
return "", err
}
}
if len(resp.PrevKvs) < 1 {
return "", nil
}
valueBytes, err := base64.RawStdEncoding.DecodeString(string(resp.PrevKvs[0].Value))
if err != nil {
return "", err
}
return string(valueBytes), nil
}
return "", errors.New("failed to delete " + key)
}
func (c *EtcdClient) List(key string, withPrefix bool) (map[string]string, error) {
var err error
var resp *clientv3.GetResponse
for retry := 0; retry < c.retryTimes; retry++ {
ctx, _ := context.WithTimeout(context.Background(), c.timeout)
if withPrefix {
resp, err = c.client.Get(ctx, key, clientv3.WithPrefix())
} else {
resp, err = c.client.Get(ctx, key)
}
if err != nil {
switch err {
case context.DeadlineExceeded:
log.Warn(err)
// 出现超时错误时进行重试
continue
default:
log.Error(err)
return nil, err
}
}
result := make(map[string]string)
for _, kvs := range resp.Kvs {
valueBytes, err := base64.RawStdEncoding.DecodeString(string(kvs.Value))
if err != nil {
return nil, err
}
result[string(kvs.Key)] = string(valueBytes)
}
return result, nil
}
return nil, errors.New("failed to list " + key)
}
func (c *EtcdClient) Watch(ctx context.Context, key string, withPrefix bool) <-chan KVAction {
var kvsWatcher clientv3.WatchChan
if withPrefix {
kvsWatcher = c.client.Watch(ctx, key, clientv3.WithPrefix(), clientv3.WithPrevKV())
} else {
kvsWatcher = c.client.Watch(ctx, key, clientv3.WithPrevKV())
}
watcher := make(chan KVAction, 1000)
go func() {
defer close(watcher)
for {
select {
case <-ctx.Done():
return
case wresp, ok := <-kvsWatcher:
if !ok {
return
}
for _, event := range wresp.Events {
switch event.Type {
case mvccpb.PUT:
valueBytes, err := base64.RawStdEncoding.DecodeString(string(event.Kv.Value))
if err != nil {
log.Error(err)
}
watcher <- KVAction{
Key: string(event.Kv.Key),
Value: string(valueBytes),
ActionType: KVActionTypeSet,
}
case mvccpb.DELETE:
valueBytes, err := base64.RawStdEncoding.DecodeString(string(event.PrevKv.Value))
if err != nil {
log.Error(err)
}
watcher <- KVAction{
Key: string(event.PrevKv.Key),
Value: string(valueBytes),
ActionType: KVActionTypeDelete,
}
default:
log.Warn(errors.New("unknown kv action type"))
}
}
}
}
}()
return watcher
}
func (c *EtcdClient) Lock(ctx context.Context, key string) error {
grantCtx, _ := context.WithCancel(ctx)
lease, err := c.client.Grant(grantCtx, 30)
if err != nil {
log.Error(err)
return err
}
ss, err := concurrency.NewSession(c.client, concurrency.WithLease(lease.ID))
if err != nil {
log.Error(err)
ss.Close()
return err
}
mtx := concurrency.NewMutex(ss, key)
lockCtx, _ := context.WithCancel(ctx)
if err := mtx.Lock(lockCtx); err != nil {
log.Error(err)
ss.Close()
return err
}
c.kvMutexMapMutex.Lock()
c.kvMutexMap[key] = KVMutex{
session: ss,
mutex: mtx,
}
c.kvMutexMapMutex.Unlock()
return nil
}
func (c *EtcdClient) Unlock(ctx context.Context, key string) error {
c.kvMutexMapMutex.Lock()
defer c.kvMutexMapMutex.Unlock()
kvMutex, ok := c.kvMutexMap[key]
if !ok {
err := e.Errorf("lock key %s not found", key)
log.Error(err)
return err
}
kvMutex.session.Close()
unlockCtx, _ := context.WithCancel(ctx)
kvMutex.mutex.Unlock(unlockCtx)
delete(c.kvMutexMap, key)
return nil
}