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main.go
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main.go
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package main
import (
"io"
"log"
"net/http"
"os"
"os/exec"
"time"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-playground/webhooks/v6/github"
)
func closeLogFile(logfile *os.File) {
if err := logfile.Close(); err != nil {
log.Panicln(err)
}
}
func getPayload(request *http.Request) (payload interface{}, err error) {
webhook, err := github.New(github.Options.Secret(os.Getenv("GITHUB_WEBHOOK_SECRET")))
if err != nil {
return
}
return webhook.Parse(request, github.PingEvent, github.ReleaseEvent)
}
func switchTag(tagName string) (err error) {
repo, err := git.PlainOpen("/repo")
if err != nil {
return
}
worktree, err := repo.Worktree()
if err != nil {
return
}
if err = worktree.Pull(&git.PullOptions{RemoteName: "origin"}); err != nil {
errMsg := err.Error()
if errMsg == "already up-to-date" {
log.Println(errMsg)
} else {
return
}
}
checkoutOptions := git.CheckoutOptions{Branch: plumbing.ReferenceName("refs/tags/" + tagName)}
return worktree.Checkout(&checkoutOptions)
}
func pingHandle(response http.ResponseWriter, _ *http.Request) {
response.WriteHeader(http.StatusNoContent)
}
func webhookHandle(response http.ResponseWriter, request *http.Request) {
payload, err := getPayload(request)
if err != nil {
log.Panicln(err)
}
if _, ok := payload.(github.PingPayload); ok {
log.Println("ping!")
response.WriteHeader(http.StatusOK)
return
}
release, ok := payload.(github.ReleasePayload)
if !ok {
log.Panicln("do not get release event...")
}
tagName := release.Release.TagName
log.Println("Tag:" + tagName)
if err = switchTag(tagName); err != nil {
log.Panicln(err)
}
restartOutput, err := exec.Command("./restart.sh", tagName).CombinedOutput()
log.Printf("%s\n", restartOutput)
if err != nil {
log.Panicln(err)
}
log.Println("done!")
response.WriteHeader(http.StatusOK)
}
func main() {
log.SetFlags(log.Ldate | log.Ltime | log.Llongfile)
logfile, err := os.OpenFile("output.log", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
log.Panicln(err)
}
defer closeLogFile(logfile)
log.SetOutput(io.MultiWriter(os.Stdout, logfile))
mux := http.NewServeMux()
mux.Handle("/ping", http.HandlerFunc(pingHandle))
mux.Handle("/webhooks", http.HandlerFunc(webhookHandle))
server := &http.Server{
Addr: ":" + os.Getenv("PORT"),
Handler: mux,
ReadTimeout: 5 * time.Second,
WriteTimeout: 10 * time.Second,
}
if err := server.ListenAndServe(); err != nil {
log.Panicln(err)
}
}