81 lines
1.5 KiB
Go
81 lines
1.5 KiB
Go
package tableflip_test
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import (
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"context"
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"flag"
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"fmt"
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"log"
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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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"git.bit5.ru/backend/tableflip"
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)
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// This shows how to use the upgrader
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// with the graceful shutdown facilities of net/http.
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func Example_httpShutdown() {
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var (
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listenAddr = flag.String("listen", "localhost:8080", "`Address` to listen on")
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pidFile = flag.String("pid-file", "", "`Path` to pid file")
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)
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flag.Parse()
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log.SetPrefix(fmt.Sprintf("%d ", os.Getpid()))
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upg, err := tableflip.New(tableflip.Options{
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PIDFile: *pidFile,
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})
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if err != nil {
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panic(err)
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}
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defer upg.Stop()
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// Do an upgrade on SIGHUP
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go func() {
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sig := make(chan os.Signal, 1)
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signal.Notify(sig, syscall.SIGHUP)
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for range sig {
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err := upg.Upgrade()
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if err != nil {
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log.Println("Upgrade failed:", err)
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}
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}
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}()
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ln, err := upg.Fds.Listen("tcp", *listenAddr)
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if err != nil {
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log.Fatalln("Can't listen:", err)
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}
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server := http.Server{
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// Set timeouts, etc.
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}
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go func() {
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err := server.Serve(ln)
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if err != http.ErrServerClosed {
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log.Println("HTTP server:", err)
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}
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}()
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log.Printf("ready")
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if err := upg.Ready(); err != nil {
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panic(err)
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}
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<-upg.Exit()
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// Make sure to set a deadline on exiting the process
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// after upg.Exit() is closed. No new upgrades can be
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// performed if the parent doesn't exit.
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time.AfterFunc(30*time.Second, func() {
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log.Println("Graceful shutdown timed out")
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os.Exit(1)
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})
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// Wait for connections to drain.
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server.Shutdown(context.Background())
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}
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