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register.go
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register.go
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// Copyright (C) 2014-2018 Goodrain Co., Ltd.
// RAINBOND, Application Management Platform
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version. For any non-GPL usage of Rainbond,
// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
// must be obtained first.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package discover
import (
"context"
"fmt"
"os"
"time"
"github.com/Sirupsen/logrus"
"github.com/coreos/etcd/clientv3"
client "github.com/coreos/etcd/clientv3"
"github.com/goodrain/rainbond/util"
)
//KeepAlive 服务注册
type KeepAlive struct {
EtcdEndpoint []string
ServerName string
HostName string
Endpoint string
TTL int64
LID clientv3.LeaseID
Done chan struct{}
etcdClient *client.Client
}
//CreateKeepAlive create keepalive for server
func CreateKeepAlive(EtcdEndpoint []string, ServerName string, HostName string, HostIP string, Port int) (*KeepAlive, error) {
if len(EtcdEndpoint) == 0 {
EtcdEndpoint = []string{"127.0.0.1:2379"}
}
if ServerName == "" || Port == 0 {
return nil, fmt.Errorf("servername or serverport can not be empty")
}
if HostName == "" {
var err error
HostName, err = os.Hostname()
if err != nil {
return nil, err
}
}
if HostIP == "" {
ip, err := util.LocalIP()
if err != nil {
logrus.Errorf("get ip failed,details %s", err.Error())
return nil, err
}
HostIP = ip.String()
}
return &KeepAlive{
EtcdEndpoint: EtcdEndpoint,
ServerName: ServerName,
HostName: HostName,
Endpoint: fmt.Sprintf("%s:%d", HostIP, Port),
TTL: 5,
Done: make(chan struct{}),
}, nil
}
//Start 开始
func (k *KeepAlive) Start() error {
duration := time.Duration(k.TTL) * time.Second
timer := time.NewTimer(duration)
etcdclient, err := client.New(client.Config{
Endpoints: k.EtcdEndpoint,
})
if err != nil {
return err
}
k.etcdClient = etcdclient
go func() {
for {
select {
case <-k.Done:
return
case <-timer.C:
if k.LID > 0 {
func() {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()
_, err := k.etcdClient.KeepAliveOnce(ctx, k.LID)
if err == nil {
timer.Reset(duration)
return
}
logrus.Warnf("%s lid[%x] keepAlive err: %s, try to reset...", k.Endpoint, k.LID, err.Error())
k.LID = 0
timer.Reset(duration)
}()
} else {
if err := k.reg(); err != nil {
logrus.Warnf("%s set lid err: %s, try to reset after %d seconds...", k.Endpoint, err.Error(), k.TTL)
} else {
logrus.Infof("%s set lid[%x] success", k.Endpoint, k.LID)
}
timer.Reset(duration)
}
}
}
}()
return nil
}
func (k *KeepAlive) etcdKey() string {
return fmt.Sprintf("/traefik/backends/%s/servers/%s/url", k.ServerName, k.HostName)
}
func (k *KeepAlive) reg() error {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()
resp, err := k.etcdClient.Grant(ctx, k.TTL+3)
if err != nil {
return err
}
if _, err := k.etcdClient.Put(ctx,
k.etcdKey(),
k.Endpoint,
clientv3.WithLease(resp.ID)); err != nil {
return err
}
logrus.Infof("Register a %s server endpoint %s to cluster", k.ServerName, k.Endpoint)
k.LID = resp.ID
return nil
}
//Stop 结束
func (k *KeepAlive) Stop() error {
close(k.Done)
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()
if _, err := k.etcdClient.Delete(ctx, k.etcdKey()); err != nil {
return err
}
logrus.Infof("cancel %s server endpoint %s from etcd", k.ServerName, k.Endpoint)
return nil
}