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utils.go
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/
utils.go
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/*
* Tencent is pleased to support the open source community by making Blueking Container Service available.
* Copyright (C) 2019 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 utils xxx
package utils
import (
"bufio"
"fmt"
"log"
"net"
"os"
"os/exec"
"strconv"
"strings"
"github.com/Tencent/bk-bcs/bcs-common/common/blog"
"github.com/Tencent/bk-bcs/bcs-runtime/bcs-k8s/bcs-component/bcs-apiserver-proxy/pkg/ipvs"
)
const (
// IpvsPersistFileName xxx
IpvsPersistFileName = "ipvsConfig.yaml"
// RcLocalIpvsFlag xxx
RcLocalIpvsFlag = "IPVS_START_UP"
)
// EndPoint wrap IP&Port
type EndPoint struct {
IP string
Port uint32
}
// String trans endpoint to ip:port
func (ep EndPoint) String() string {
port := strconv.Itoa(int(ep.Port))
return ep.IP + ":" + port
}
// SplitServer split server to ip, port
func SplitServer(server string) (string, uint32) {
s, p, err := net.SplitHostPort(server)
if err != nil {
blog.Errorf("SplitServer error: %s", err.Error())
return "", 0
}
port, err := strconv.Atoi(p)
if err != nil {
blog.Errorf("SplitServer error: %s", err.Error())
return "", 0
}
blog.V(5).Infof("SplitServer debug: IP: %s, Port: %s", s, p)
return s, uint32(port)
}
// BuildVirtualServer build vip to ipvs.VirtualServer
func BuildVirtualServer(vip string, scheduler string) *ipvs.VirtualServer {
ip, port := SplitServer(vip)
virServer := &ipvs.VirtualServer{
Address: net.ParseIP(ip),
Protocol: "TCP",
Port: port,
Scheduler: scheduler,
Flags: 0,
Timeout: 0,
}
return virServer
}
// BuildRealServer build real to ipvs.RealServer
func BuildRealServer(real string) *ipvs.RealServer {
ip, port := SplitServer(real)
realServer := &ipvs.RealServer{
Address: net.ParseIP(ip),
Port: port,
Weight: 1,
}
return realServer
}
// WriteToFile xxx
func WriteToFile(filePath string, content string) error {
var file *os.File
var err error
// NOCC:gas/permission(设计如此)
file, err = os.OpenFile(filePath, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
if err != nil {
log.Printf("open file %s failed; %v", filePath, err)
return err
}
defer file.Close()
_, err = file.Write([]byte(content))
if err != nil {
log.Printf("write to file %s failed", filePath)
return err
}
log.Printf("write to file %s succeed!", filePath)
return nil
}
// SetIpvsStartup xxx
func SetIpvsStartup(ipvsPersistDir string, toolPath string) error {
command := "chmod +x /etc/rc.d/rc.local"
// NOCC:gas/subprocess(设计如此)
cmd := exec.Command("/bin/sh", "-c", command)
output, err := cmd.Output()
if err != nil {
log.Printf("command [%s] exec failed", command)
}
resp := string(output)
log.Println(resp)
exist, err := checkFlagExist("/etc/rc.local", RcLocalIpvsFlag)
if err != nil {
return err
}
if exist {
return nil
}
commandNew := fmt.Sprintf("%v -cmd reload -persistDir %v",
toolPath, ipvsPersistDir)
commandNew = "# " + RcLocalIpvsFlag + "\n" + commandNew + "\n"
err = WriteToFile("/etc/rc.local", commandNew)
if err != nil {
log.Printf("write command [%s] to rc.local failed", commandNew)
return err
}
return nil
}
func checkFlagExist(path string, flag string) (bool, error) {
file, err := os.Open(path)
if err != nil {
log.Printf("open file [%v] failed", path)
return false, err
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
if strings.Contains(scanner.Text(), flag) {
log.Printf("ipvs startup flag already exists")
return true, nil
}
}
if err := scanner.Err(); err != nil {
log.Printf("scan file [%s] failed, %v", path, err)
return false, err
}
return false, nil
}