Rainbond/cmd/mesh-data-panel/sidecar.go
2020-09-06 11:09:48 +08:00

157 lines
3.9 KiB
Go

// RAINBOND, Application Management Platform
// Copyright (C) 2014-2017 Goodrain Co., Ltd.
// 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 main
import (
"encoding/json"
"fmt"
"net/http"
"os"
"os/signal"
"syscall"
"time"
"github.com/sirupsen/logrus"
api_model "github.com/goodrain/rainbond/api/model"
"github.com/goodrain/rainbond/cmd"
envoyv2 "github.com/goodrain/rainbond/node/core/envoy/v2"
"github.com/goodrain/rainbond/util"
)
func main() {
if len(os.Args) > 1 && os.Args[1] == "version" {
cmd.ShowVersion("sidecar")
}
loggerFile, _ := os.Create("/var/log/sidecar.log")
if loggerFile != nil {
defer loggerFile.Close()
logrus.SetOutput(loggerFile)
}
if os.Getenv("DEBUG") == "true" {
logrus.SetLevel(logrus.DebugLevel)
}
if err := Run(); err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
os.Exit(1)
}
}
//Run run
func Run() error {
// start run first
run()
ticker := time.NewTicker(time.Second * 5)
defer ticker.Stop()
//step finally: listen Signal
term := make(chan os.Signal)
signal.Notify(term, os.Interrupt, syscall.SIGTERM)
for {
select {
case <-term:
logrus.Warn("Received SIGTERM, exiting gracefully...")
return nil
case <-ticker.C:
run()
}
}
}
var oldHosts = make(map[string]string)
func run() {
configs := discoverConfig()
if configs != nil {
if hosts := getHosts(configs); hosts != nil {
if err := writeHosts(hosts); err != nil {
logrus.Errorf("write hosts failure %s", err.Error())
} else {
logrus.Debugf("rewrite hosts file success, %+v", hosts)
oldHosts = hosts
}
}
}
}
func haveChange(hosts, oldHosts map[string]string) bool {
if len(hosts) != len(oldHosts) {
return true
}
for k, v := range hosts {
if ov, exist := oldHosts[k]; !exist || v != ov {
return true
}
}
for k, v := range oldHosts {
if ov, exist := hosts[k]; !exist || v != ov {
return true
}
}
return false
}
func discoverConfig() *api_model.ResourceSpec {
discoverURL := fmt.Sprintf("http://%s:6100/v1/resources/%s/%s/%s", os.Getenv("XDS_HOST_IP"), os.Getenv("TENANT_ID"), os.Getenv("SERVICE_NAME"), os.Getenv("PLUGIN_ID"))
http.DefaultClient.Timeout = time.Second * 5
res, err := http.Get(discoverURL)
if err != nil {
logrus.Errorf("get config failure %s", err.Error())
}
if res != nil && res.Body != nil {
defer res.Body.Close()
var rs api_model.ResourceSpec
if err := json.NewDecoder(res.Body).Decode(&rs); err != nil {
logrus.Errorf("parse config body failure %s", err.Error())
} else {
return &rs
}
}
return nil
}
func getHosts(configs *api_model.ResourceSpec) map[string]string {
hosts := make(map[string]string)
for _, service := range configs.BaseServices {
options := envoyv2.GetOptionValues(service.Options)
for _, domain := range options.Domains {
if domain != "" && domain != "*" {
hosts[domain] = "127.0.0.1"
}
}
}
if len(hosts) == 0 {
return nil
}
return hosts
}
func writeHosts(ipnames map[string]string) error {
hostFilePath := os.Getenv("HOST_FILE_PATH")
if hostFilePath == "" {
hostFilePath = "/etc/hosts"
}
hosts, err := util.NewHosts(hostFilePath)
if err != nil {
return err
}
for name, ip := range ipnames {
hosts.Add(ip, name)
}
return hosts.Flush()
}