322 lines
7.0 KiB
Go
322 lines
7.0 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"github.com/robfig/cron"
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log "github.com/sirupsen/logrus"
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"github.com/urfave/cli"
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"gopkg.in/src-d/go-git.v4"
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"gopkg.in/src-d/go-git.v4/plumbing/object"
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githttp "gopkg.in/src-d/go-git.v4/plumbing/transport/http"
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"io/ioutil"
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"net/http"
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"net/smtp"
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"os"
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"os/signal"
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"path"
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"regexp"
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"strconv"
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"strings"
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"syscall"
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"time"
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)
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type Configuration struct {
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RepositoryUrl string `json:"url"`
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Username string `json:"name"`
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Email string `json:"email"`
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GitLogin string `json:"login"`
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GitPassword string `json:"password"`
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}
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var (
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configPath string
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scheduleSpec string
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)
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var version = "master"
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var commit = "unknown"
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var date = "unknown"
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func main() {
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app := cli.NewApp()
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app.Name = "watchtower"
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app.Version = version + " - " + commit + " - " + date
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app.Usage = "Automatically update running Docker containers"
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app.Before = before
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app.Action = start
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app.Flags = []cli.Flag{
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cli.StringFlag{
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Name: "config, C",
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Usage: "path to config file",
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Value: "/config/conf.json",
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EnvVar: "CONFIG_PATH",
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},
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cli.IntFlag{
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Name: "interval, i",
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Usage: "poll interval (in seconds)",
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Value: 300,
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EnvVar: "DNSUPDATER_POLL_INTERVAL",
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},
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cli.StringFlag{
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Name: "schedule, s",
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Usage: "the cron expression which defines when to update",
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EnvVar: "DNSUPDATER_SCHEDULE",
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},
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}
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if err := app.Run(os.Args); err != nil {
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log.Fatal(err)
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}
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}
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func before(c *cli.Context) error {
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if c.GlobalBool("debug") {
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log.SetLevel(log.DebugLevel)
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}
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pollingSet := c.IsSet("interval")
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cronSet := c.IsSet("schedule")
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if pollingSet && cronSet {
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log.Fatal("Only schedule or interval can be defined, not both.")
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} else if cronSet {
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scheduleSpec = c.String("schedule")
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} else {
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scheduleSpec = "@every " + strconv.Itoa(c.Int("interval")) + "s"
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}
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return nil
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}
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func start(c *cli.Context) error {
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tryLockSem := make(chan bool, 1)
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tryLockSem <- true
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cron := cron.New()
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err := cron.AddFunc(
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scheduleSpec,
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func() {
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select {
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case v := <-tryLockSem:
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defer func() { tryLockSem <- v }()
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if err := update(c); err != nil {
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log.Println(err)
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SendStatusMail(fmt.Sprintf("Error during update process : %s", err))
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}
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default:
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log.Debug("Skipped another update already running.")
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}
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nextRuns := cron.Entries()
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if len(nextRuns) > 0 {
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log.Debug("Scheduled next run: " + nextRuns[0].Next.String())
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}
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})
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if err != nil {
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return err
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}
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log.Info("First run: " + cron.Entries()[0].Schedule.Next(time.Now()).String())
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cron.Start()
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// Graceful shut-down on SIGINT/SIGTERM
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interrupt := make(chan os.Signal, 1)
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signal.Notify(interrupt, os.Interrupt)
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signal.Notify(interrupt, syscall.SIGTERM)
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<-interrupt
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cron.Stop()
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log.Info("Waiting for running update to be finished...")
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<-tryLockSem
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os.Exit(1)
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return nil
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}
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func update(c *cli.Context) error {
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Info("Running dnsupdater...")
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configPath = c.String("config")
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if confPathExists, _ := exists(configPath); !confPathExists {
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configPath = "./data";
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}
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file, _ := os.Open(path.Join(configPath, "conf.json"))
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defer file.Close()
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decoder := json.NewDecoder(file)
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configuration := Configuration{}
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err := decoder.Decode(&configuration)
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Info("Repository : %s", configuration.RepositoryUrl)
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Info("Name : %s", configuration.Username)
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Info("Email : %s", configuration.Email)
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Info("GitLogin : %s", configuration.GitLogin)
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err = os.RemoveAll(path.Join(configPath, "data"))
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if err != nil {
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return err
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}
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_, err = git.PlainClone(path.Join(configPath, "data"), false, &git.CloneOptions{
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URL: configuration.RepositoryUrl,
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Progress: os.Stdout,
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})
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if err != nil {
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return err
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}
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currentIp, err := GetCurrentIp()
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if err != nil {
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return err
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}
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newIp, err := GetOutboundIP()
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if err != nil {
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return err
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}
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if currentIp == newIp {
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Info("Ip has not changed %s", currentIp)
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return nil
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}
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Info("Ip has changed %s -> %s", currentIp, newIp)
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SetCurrentIp(currentIp, newIp)
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repo, err := git.PlainOpen(path.Join(configPath, "data"))
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if err != nil {
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return err
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}
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w, err := repo.Worktree()
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if err != nil {
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return err
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}
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_, err = w.Add("templates/home_a.lua")
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if err != nil {
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return err
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}
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status, err := w.Status()
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if err != nil {
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return err
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}
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fmt.Println(status)
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_, err = w.Commit(fmt.Sprintf("Changement d'IP maison : %s -> %s", currentIp, newIp), &git.CommitOptions{
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Author: &object.Signature{
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Name: configuration.Username,
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Email: configuration.Email,
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When: time.Now().Local(),
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},
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})
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if err != nil {
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return err
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}
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err = repo.Push(&git.PushOptions{
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Auth: &githttp.BasicAuth{
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Username: configuration.GitLogin,
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Password: configuration.GitPassword,
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},
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})
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if err != nil {
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return err
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}
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SendStatusMail(fmt.Sprintf(`Home IP has changed : %s -> %s
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Dns updated successfully`, currentIp, newIp))
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return nil
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}
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func SendStatusMail(messageText string) {
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// user we are authorizing as
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from := "laurent@lehouerou.net"
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// use we are sending email to
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to := "laurent@lehouerou.net"
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// server we are authorized to send email through
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host := "smtp.fastmail.com"
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// Create the authentication for the SendMail()
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// using PlainText, but other authentication methods are encouraged
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auth := smtp.PlainAuth("", from, "c9bd8fb8l4bhs2f8", host)
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// NOTE: Using the backtick here ` works like a heredoc, which is why all the
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// rest of the lines are forced to the beginning of the line, otherwise the
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// formatting is wrong for the RFC 822 style
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message := fmt.Sprintf(`To: "Laurent Le Houerou" <laurent@lehouerou.net>
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From: "Laurent Le Houerou" <laurent@lehouerou.net>
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Subject: DnsUpdater Status
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%s
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`,messageText)
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if err := smtp.SendMail(host+":587", auth, from, []string{to}, []byte(message)); err != nil {
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fmt.Println("Error SendMail: ", err)
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} else {
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fmt.Println("Email Sent!")
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}
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}
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func GetCurrentIp() (string, error) {
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b, err := ioutil.ReadFile(path.Join(configPath, "data/templates/home_a.lua"))
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if err != nil {
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return "", err
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}
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re := regexp.MustCompile("\"(.*?)\"")
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match := re.FindStringSubmatch(string(b))
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return match[1], nil
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}
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func SetCurrentIp(oldip string, newip string) error {
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b, err := ioutil.ReadFile(path.Join(configPath, "data/templates/home_a.lua"))
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if err != nil {
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return err
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}
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s := string(b)
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s = strings.Replace(s, oldip, newip, 1)
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ioutil.WriteFile(path.Join(configPath, "data/templates/home_a.lua"), []byte(s), 0644)
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return nil
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}
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func GetOutboundIP() (string, error) {
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url := "https://diagnostic.opendns.com/myip"
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req, err := http.NewRequest("GET", url, nil)
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if err != nil {
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return "", err
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}
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res, err := http.DefaultClient.Do(req)
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if err != nil {
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return "", err
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}
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defer res.Body.Close()
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body, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return "", err
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}
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return string(body), nil
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}
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func exists(path string) (bool, error) {
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_, err := os.Stat(path)
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if err == nil {
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return true, nil
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}
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if os.IsNotExist(err) {
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return false, nil
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}
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return true, err
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}
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func Info(format string, args ...interface{}) {
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fmt.Printf("\x1b[34;1m%s\x1b[0m\n", fmt.Sprintf(format, args...))
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}
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