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package getcdv3
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import (
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"Open_IM/pkg/common/log"
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"context"
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"fmt"
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"go.etcd.io/etcd/clientv3"
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"net"
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"strconv"
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"strings"
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"time"
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)
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type RegEtcd struct {
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cli *clientv3.Client
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ctx context.Context
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cancel context.CancelFunc
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key string
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}
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var rEtcd *RegEtcd
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// "%s:///%s/"
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func GetPrefix(schema, serviceName string) string {
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return fmt.Sprintf("%s:///%s/", schema, serviceName)
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}
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// "%s:///%s"
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func GetPrefix4Unique(schema, serviceName string) string {
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return fmt.Sprintf("%s:///%s", schema, serviceName)
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}
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// "%s:///%s/" -> "%s:///%s:ip:port"
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func RegisterEtcd4Unique(schema, etcdAddr, myHost string, myPort int, serviceName string, ttl int) error {
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serviceName = serviceName + ":" + net.JoinHostPort(myHost, strconv.Itoa(myPort))
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return RegisterEtcd(schema, etcdAddr, myHost, myPort, serviceName, ttl)
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}
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//etcdAddr separated by commas
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func RegisterEtcd(schema, etcdAddr, myHost string, myPort int, serviceName string, ttl int) error {
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ttl = ttl * 3
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cli, err := clientv3.New(clientv3.Config{
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Endpoints: strings.Split(etcdAddr, ","), DialTimeout: 5 * time.Second})
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log.Info("", "RegisterEtcd, ", schema, etcdAddr, myHost, myPort, serviceName, ttl)
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if err != nil {
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return fmt.Errorf("create etcd clientv3 client failed, errmsg:%v, etcd addr:%s", err, etcdAddr)
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}
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//lease
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ctx, cancel := context.WithCancel(context.Background())
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resp, err := cli.Grant(ctx, int64(ttl))
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if err != nil {
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return fmt.Errorf("grant failed")
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}
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// schema:///serviceName/ip:port ->ip:port
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serviceValue := net.JoinHostPort(myHost, strconv.Itoa(myPort))
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serviceKey := GetPrefix(schema, serviceName) + serviceValue
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//set key->value
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if _, err := cli.Put(ctx, serviceKey, serviceValue, clientv3.WithLease(resp.ID)); err != nil {
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return fmt.Errorf("put failed, errmsg:%v， key:%s, value:%s", err, serviceKey, serviceValue)
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}
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//keepalive
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kresp, err := cli.KeepAlive(ctx, resp.ID)
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if err != nil {
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return fmt.Errorf("keepalive failed, errmsg:%v, lease id:%d", err, resp.ID)
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}
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//log.Info("", "RegisterEtcd ok ")
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go func() {
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for {
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select {
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case pv, ok := <-kresp:
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if ok == true {
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log.Debug("", "KeepAlive kresp ok", pv)
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} else {
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log.Error("", "KeepAlive kresp failed", pv)
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t := time.NewTicker(time.Duration(ttl/2) * time.Second)
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for {
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select {
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case <-t.C:
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}
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ctx, _ := context.WithCancel(context.Background())
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resp, err := cli.Grant(ctx, int64(ttl))
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if err != nil {
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log.Error("", "Grant failed ", err.Error())
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continue
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}
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if _, err := cli.Put(ctx, serviceKey, serviceValue, clientv3.WithLease(resp.ID)); err != nil {
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log.Error("", "etcd Put failed ", err.Error(), serviceKey, serviceValue, resp.ID)
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continue
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} else {
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log.Info("", "etcd Put ok", serviceKey, serviceValue, resp.ID)
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}
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}
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}
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}
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}
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}()
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rEtcd = &RegEtcd{ctx: ctx,
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cli: cli,
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cancel: cancel,
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key: serviceKey}
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return nil
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}
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func UnRegisterEtcd() {
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//delete
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rEtcd.cancel()
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rEtcd.cli.Delete(rEtcd.ctx, rEtcd.key)
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}
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