mirror of
https://gitee.com/rainbond/Rainbond.git
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157 lines
3.9 KiB
Go
157 lines
3.9 KiB
Go
// RAINBOND, Application Management Platform
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// Copyright (C) 2014-2017 Goodrain Co., Ltd.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version. For any non-GPL usage of Rainbond,
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// one or multiple Commercial Licenses authorized by Goodrain Co., Ltd.
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// must be obtained first.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package main
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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"time"
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"github.com/sirupsen/logrus"
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api_model "github.com/goodrain/rainbond/api/model"
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"github.com/goodrain/rainbond/cmd"
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envoyv2 "github.com/goodrain/rainbond/node/core/envoy/v2"
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"github.com/goodrain/rainbond/util"
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)
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func main() {
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if len(os.Args) > 1 && os.Args[1] == "version" {
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cmd.ShowVersion("sidecar")
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}
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loggerFile, _ := os.Create("/var/log/sidecar.log")
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if loggerFile != nil {
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defer loggerFile.Close()
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logrus.SetOutput(loggerFile)
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}
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if os.Getenv("DEBUG") == "true" {
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logrus.SetLevel(logrus.DebugLevel)
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}
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if err := Run(); err != nil {
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fmt.Fprintf(os.Stderr, "error: %v\n", err)
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os.Exit(1)
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}
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}
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//Run run
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func Run() error {
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// start run first
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run()
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ticker := time.NewTicker(time.Second * 5)
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defer ticker.Stop()
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//step finally: listen Signal
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term := make(chan os.Signal)
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signal.Notify(term, os.Interrupt, syscall.SIGTERM)
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for {
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select {
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case <-term:
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logrus.Warn("Received SIGTERM, exiting gracefully...")
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return nil
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case <-ticker.C:
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run()
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}
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}
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}
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var oldHosts = make(map[string]string)
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func run() {
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configs := discoverConfig()
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if configs != nil {
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if hosts := getHosts(configs); hosts != nil {
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if err := writeHosts(hosts); err != nil {
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logrus.Errorf("write hosts failure %s", err.Error())
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} else {
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logrus.Debugf("rewrite hosts file success, %+v", hosts)
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oldHosts = hosts
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}
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}
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}
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}
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func haveChange(hosts, oldHosts map[string]string) bool {
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if len(hosts) != len(oldHosts) {
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return true
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}
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for k, v := range hosts {
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if ov, exist := oldHosts[k]; !exist || v != ov {
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return true
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}
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}
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for k, v := range oldHosts {
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if ov, exist := hosts[k]; !exist || v != ov {
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return true
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}
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}
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return false
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}
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func discoverConfig() *api_model.ResourceSpec {
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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"))
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http.DefaultClient.Timeout = time.Second * 5
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res, err := http.Get(discoverURL)
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if err != nil {
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logrus.Errorf("get config failure %s", err.Error())
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}
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if res != nil && res.Body != nil {
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defer res.Body.Close()
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var rs api_model.ResourceSpec
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if err := json.NewDecoder(res.Body).Decode(&rs); err != nil {
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logrus.Errorf("parse config body failure %s", err.Error())
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} else {
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return &rs
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}
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}
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return nil
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}
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func getHosts(configs *api_model.ResourceSpec) map[string]string {
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hosts := make(map[string]string)
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for _, service := range configs.BaseServices {
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options := envoyv2.GetOptionValues(service.Options)
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for _, domain := range options.Domains {
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if domain != "" && domain != "*" {
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hosts[domain] = "127.0.0.1"
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}
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}
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}
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if len(hosts) == 0 {
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return nil
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}
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return hosts
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}
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func writeHosts(ipnames map[string]string) error {
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hostFilePath := os.Getenv("HOST_FILE_PATH")
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if hostFilePath == "" {
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hostFilePath = "/etc/hosts"
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}
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hosts, err := util.NewHosts(hostFilePath)
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if err != nil {
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return err
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}
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for name, ip := range ipnames {
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hosts.Add(ip, name)
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}
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return hosts.Flush()
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}
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