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init.go
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init.go
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package etcd
import (
"context"
"errors"
"time"
"github.com/bytedance/sonic"
"github.com/darabuchi/log"
"github.com/darabuchi/utils"
"go.etcd.io/etcd/api/v3/mvccpb"
clientv3 "go.etcd.io/etcd/client/v3"
"go.uber.org/zap"
)
var cli *clientv3.Client
var (
ErrNotFound = errors.New("key not found")
)
func Connect(c Config) error {
if cli != nil {
return nil
}
var err error
cli, err = clientv3.New(clientv3.Config{
Endpoints: c.Addrs,
AutoSyncInterval: time.Second,
DialTimeout: 5 * time.Second,
DialKeepAliveTime: time.Second,
DialKeepAliveTimeout: time.Second,
MaxCallSendMsgSize: 0,
MaxCallRecvMsgSize: 0,
TLS: nil,
Username: "",
Password: "",
RejectOldCluster: true,
DialOptions: nil,
Context: nil,
Logger: zap.NewNop(),
LogConfig: nil,
PermitWithoutStream: true,
})
if err != nil {
log.Errorf("err:%v", err)
return err
}
return nil
}
type EventType string
const (
Changed EventType = "changed"
Deleted EventType = "delete"
)
type Event struct {
Key string
Type EventType
Value string
Version int64
}
func Watch(key string, logic func(event Event)) {
wc := cli.Watch(context.Background(), key)
go func() {
for {
select {
case v := <-wc:
for _, event := range v.Events {
logic(Event{
Key: string(event.Kv.Key),
Value: string(event.Kv.Value),
Version: event.Kv.Version,
Type: func() EventType {
switch event.Type {
case mvccpb.PUT:
return Changed
case mvccpb.DELETE:
return Deleted
default:
return ""
}
}(),
})
}
}
}
}()
}
func WatchPrefix(key string, logic func(event Event)) {
wc := cli.Watch(context.Background(), key, clientv3.WithPrefix())
go func() {
for {
select {
case v := <-wc:
for _, event := range v.Events {
logic(Event{
Key: string(event.Kv.Key),
Value: string(event.Kv.Value),
Version: event.Kv.Version,
Type: func() EventType {
switch event.Type {
case mvccpb.PUT:
return Changed
case mvccpb.DELETE:
return Deleted
default:
return ""
}
}(),
})
}
}
}
}()
}
func Set(key string, val interface{}) error {
_, err := cli.Put(context.TODO(), key, utils.ToString(val))
if err != nil {
log.Errorf("err:%v", err)
return err
}
return nil
}
func SetEx(key string, val interface{}, timeout time.Duration) error {
lease := clientv3.NewLease(cli)
defer lease.Close()
leaseRsp, err := lease.Grant(context.TODO(), int64(timeout.Seconds()))
if err != nil {
log.Errorf("err:%v", err)
return err
}
_, err = cli.Put(context.TODO(), key, utils.ToString(val), clientv3.WithLease(leaseRsp.ID))
if err != nil {
log.Errorf("err:%v", err)
return err
}
return nil
}
func Get(key string) ([]byte, error) {
resp, err := cli.Get(context.TODO(), key)
if err != nil {
log.Errorf("err:%v", err)
return nil, err
}
for _, kv := range resp.Kvs {
if string(kv.Key) != key {
continue
}
return kv.Value, nil
}
return nil, ErrNotFound
}
func GetJson(key string, j interface{}) error {
val, err := Get(key)
if err != nil {
log.Errorf("err:%v", err)
return err
}
err = sonic.Unmarshal(val, j)
if err != nil {
log.Errorf("err:%v", err)
return err
}
return nil
}