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rdiscover.go
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rdiscover.go
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/*
* Tencent is pleased to support the open source community by making 蓝鲸 available.
* Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
* Licensed under the MIT License (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
* http://opensource.org/licenses/MIT
* 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 discovery
import (
"configcenter/src/framework/core/log"
"encoding/json"
"fmt"
"math/rand"
"os"
"strconv"
"sync"
"time"
"configcenter/src/common/RegisterDiscover"
"configcenter/src/common/blog"
"configcenter/src/common/types"
"configcenter/src/common/version"
"context"
)
var _ DiscoverInterface = &RegDiscover{}
// RegDiscover register and discover
type RegDiscover struct {
moduleName string
ip string
port uint
isSSL bool
rd *RegisterDiscover.RegDiscover
rootCtx context.Context
cancel context.CancelFunc
topoServs []*types.TopoServInfo
topoLock sync.RWMutex
procServs []*types.ProcServInfo
procLock sync.RWMutex
}
// NewRegDiscover create a RegDiscover object
func NewRegDiscover(moduleName string, zkserv string, ip string, port uint, isSSL bool) *RegDiscover {
return &RegDiscover{
moduleName: moduleName,
ip: ip,
port: port,
isSSL: isSSL,
rd: RegisterDiscover.NewRegDiscoverEx(zkserv, 10*time.Second),
topoServs: []*types.TopoServInfo{},
procServs: []*types.ProcServInfo{},
}
}
// Ping to ping server
func (cc *RegDiscover) Ping() error {
return cc.rd.Ping()
}
// Start the register and discover
func (r *RegDiscover) Start() error {
//create root context
r.rootCtx, r.cancel = context.WithCancel(context.Background())
//start regdiscover
if err := r.rd.Start(); err != nil {
blog.Error("fail to start register and discover serv. err:%s", err.Error())
return err
}
// register migrate server
if err := r.registerItself(); err != nil {
blog.Error("fail to register migrate(%s), err:%s", r.ip, err.Error())
return err
}
// here: discover other services
/// cc api server
apiPath := types.CC_SERV_BASEPATH + "/" + types.CC_MODULE_APISERVER
apiEvent, err := r.rd.DiscoverService(apiPath)
if err != nil {
blog.Errorf("fail to register discover for proc server. err:%s", err.Error())
return err
}
for {
select {
case procEnv := <-apiEvent:
r.discoverApiServ(procEnv.Server)
case <-r.rootCtx.Done():
blog.Warn("register and discover serv done")
return nil
}
}
}
// Stop the register and discover
func (r *RegDiscover) Stop() error {
r.cancel()
r.rd.Stop()
return nil
}
func (r *RegDiscover) GetServer(servType string) (string, error) {
switch servType {
case types.CC_MODULE_APISERVER:
return r.GetApiServ()
}
err := fmt.Errorf("there is no server discover for type(%s)", servType)
blog.Errorf("%s", err.Error())
return "", err
}
// GetApiServ fetch proc server info
func (r *RegDiscover) GetApiServ() (string, error) {
r.procLock.RLock()
defer r.procLock.RUnlock()
lServ := len(r.procServs)
if lServ <= 0 {
err := fmt.Errorf("there is no api servers")
blog.Errorf("%s", err.Error())
return "", err
}
//rand
rand.Seed(int64(time.Now().Nanosecond()))
servInfo := r.procServs[rand.Intn(lServ)]
host := servInfo.Scheme + "://" + servInfo.IP + ":" + strconv.Itoa(int(servInfo.Port))
return host, nil
}
func (r *RegDiscover) registerItself() error {
migrateServInfo := new(types.MigrateServInfo)
migrateServInfo.IP = r.ip
migrateServInfo.Port = r.port
migrateServInfo.Scheme = "http"
if r.isSSL {
migrateServInfo.Scheme = "https"
}
migrateServInfo.Version = version.GetVersion()
migrateServInfo.Pid = os.Getpid()
data, err := json.Marshal(migrateServInfo)
if err != nil {
blog.Error("fail to marshal Migrate server info to json. err:%s", err.Error())
return err
}
path := types.CC_SERV_BASEPATH + "/framework/" + r.moduleName + "/" + r.ip
return r.rd.RegisterAndWatchService(path, data)
}
func (r *RegDiscover) discoverApiServ(servInfos []string) error {
blog.Infof("discover api server(%v)", servInfos)
procServs := []*types.ProcServInfo{}
for _, serv := range servInfos {
proc := new(types.ProcServInfo)
if err := json.Unmarshal([]byte(serv), proc); err != nil {
blog.Warnf("fail to do json unmarshal(%s), err:%s", serv, err.Error())
continue
}
procServs = append(procServs, proc)
}
r.procLock.Lock()
defer r.procLock.Unlock()
r.procServs = procServs
return nil
}
func (r *RegDiscover) Input() string {
return ""
}
func (r *RegDiscover) Output() string {
apiaddress, err := r.GetApiServ()
if err != nil {
log.Errorf("%v", err)
}
return apiaddress
}