109 lines
1.8 KiB
Go
109 lines
1.8 KiB
Go
package main
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import (
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"context"
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"flag"
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"log"
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"net/http"
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"os"
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"os/exec"
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"os/signal"
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"path/filepath"
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"sync"
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"syscall"
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"time"
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)
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var (
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devMode = flag.Bool("dev", false, "Run yarn autoreload underneath Go")
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)
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const (
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publicWebPath = "./web/public/"
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)
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func main() {
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flag.Parse()
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var wg sync.WaitGroup
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c := make(chan os.Signal, 1)
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signal.Notify(c, os.Interrupt)
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ctx, cancel := context.WithCancel(context.Background())
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go func() {
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oscall := <-c
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log.Printf("system call:%+v", oscall)
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cancel()
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}()
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wg.Add(1)
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go serveHTTP(ctx, &wg)
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if *devMode {
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wg.Add(1)
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go runYarn(ctx, &wg)
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}
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wg.Wait()
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}
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func serveHTTP(ctx context.Context, wg *sync.WaitGroup) {
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fs := http.FileServer(http.Dir(publicWebPath))
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mux := http.NewServeMux()
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mux.Handle("/", fs)
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srv := &http.Server{
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Addr: ":5000",
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Handler: mux,
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}
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go func() {
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if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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log.Fatalf("listen:%+s\n", err)
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}
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}()
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log.Printf("Listening on port :5000")
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<-ctx.Done()
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log.Printf("server stopped")
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ctxShutDown, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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if err := srv.Shutdown(ctxShutDown); err != nil {
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if err != http.ErrServerClosed {
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log.Fatalf("server Shutdown Failed:%+s", err)
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}
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}
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log.Printf("server exited properly")
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wg.Done()
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return
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}
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func runYarn(ctx context.Context, wg *sync.WaitGroup) {
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var err error
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cmd := exec.Command("yarn", "dev")
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cmd.Env = append(cmd.Env, "SKIP_SERVE=1")
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cmd.Dir, err = filepath.Abs("./web/")
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cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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if err != nil {
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panic(err)
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}
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err = cmd.Start()
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if err != nil {
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panic(err)
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}
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<-ctx.Done()
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log.Println("closing")
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err = syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)
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if err != nil {
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panic(err)
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}
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wg.Done()
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return
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}
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