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server.go
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server.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 (
"encoding/json"
"fmt"
"strings"
"sync"
regd "configcenter/src/common/RegisterDiscover"
"configcenter/src/common/blog"
"configcenter/src/common/types"
"configcenter/src/framework/core/errors"
)
func newServerDiscover(disc *regd.RegDiscover, path string) (Interface, error) {
discoverChan, eventErr := disc.DiscoverService(path)
if nil != eventErr {
return nil, eventErr
}
svr := &server{
path: path,
servers: make([]string, 0),
discoverChan: discoverChan,
}
svr.run()
return svr, nil
}
type server struct {
sync.Mutex
index int
path string
servers []string
discoverChan <-chan *regd.DiscoverEvent
}
func (s *server) GetServers() ([]string, error) {
s.Lock()
defer s.Unlock()
num := len(s.servers)
if num == 0 {
return []string{}, errors.New("oops, there is no server can be used")
}
if s.index < num-1 {
s.index = s.index + 1
return append(s.servers[s.index-1:], s.servers[:s.index-1]...), nil
} else {
s.index = 0
return append(s.servers[num-1:], s.servers[:num-1]...), nil
}
}
func (s *server) run() {
blog.Infof("start to discover cc component from zk, path:[%s].", s.path)
go func() {
for svr := range s.discoverChan {
blog.Warnf("received one zk event from path %s.", s.path)
if svr.Err != nil {
blog.Errorf("get zk event with error about path[%s]. err: %v", s.path, svr.Err)
continue
}
if len(svr.Server) <= 0 {
blog.Warnf("get zk event with 0 instance with path[%s], reset its servers", s.path)
s.resetServer()
continue
}
s.updateServer(svr.Server)
}
}()
}
func (s *server) resetServer() {
s.Lock()
defer s.Unlock()
s.servers = make([]string, 0)
}
func (s *server) updateServer(svrs []string) {
newSvr := make([]string, 0)
for _, svr := range svrs {
server := new(types.ServerInfo)
if err := json.Unmarshal([]byte(svr), server); err != nil {
blog.Errorf("unmarshal server info failed, zk path[%s], err: %v", s.path, err)
continue
}
scheme := "http"
if server.Scheme == "https" {
scheme = "https"
}
if server.Port == 0 {
blog.Errorf("invalid port 0, with zk path: %s", s.path)
continue
}
if len(server.IP) == 0 {
blog.Errorf("invalid ip with zk path: %s", s.path)
continue
}
host := fmt.Sprintf("%s://%s:%d", scheme, server.IP, server.Port)
newSvr = append(newSvr, host)
}
s.Lock()
defer s.Unlock()
if len(newSvr) != 0 {
s.servers = newSvr
blog.V(3).Infof("update component with new server instance[%s] about path: %s", strings.Join(newSvr, "; "), s.path)
}
}