Shutdown workers

Transcript

1. ґଘํ޲ͷ͋Δ
 8PSLFSΛ؅ཧ͢Δ 6NFEBHP
   
   4QSJOH
   
2. ґଘํ޲ͷ͋Δ
 8PSLFSΛ؅ཧ͢Δ ࢭΊΔ 6NFEBHP
   
   4QSJOH
   
3. 8JLJΈ͍ͨͳαʔϏεͰΑ͋͘Δ΍ͭ w ࣗ෼ͷهࣄͷ಺༰Λશͯμ΢ϯϩʔυ͍ͨ͠
   Ὂ %VNQϦΫΤετΛૹΔ
   Ὂ ཪଆͰॲཧΛ૸ΒͤΔ
   Ὂ Ϣʔβʔʹରͯ͠μ΢ϯϩʔυՄೳͷ௨஌ΛૹΔ !3
4. "1*
   4FSWFS %VNQ
   8PSLFS /PUJpDBUJPO
 8PSLFS 3FRVFTU ϝʔϧͱ͔
5. "1*
   4FSWFS %VNQ
   8PSLFS /PUJpDBUJPO
 8PSLFS 3FRVFTU ϝʔϧͱ͔ DIBOOFM DIBOOFM HSPVUJOF HSPVUJOF HSPVUJOF
6. Ͳ͏΍ͬͯࢭΊΔʁ w 04ͷγάφϧΛݟͯॱ൪ʹࢭΊ͍͖͍ͯͨ
   w طʹड͚෇͚ͨ%VNQॲཧ͸ऴΘΒ͔ͤͯΒࢭΊ͍ͨ
   Ὂ ΋͘͠͸ద੾ʹୀආͤ͞Δ
   w DPOUFYUΛ࢖͑͹Ͱ͖ͦ͏ !6
7. "1*
   4FSWFS %VNQ
   8PSLFS /PUJpDBUJPO
 8PSLFS 4JHOBM
 8BUDIFS TZTDBMM4*(*/5
 TZTDBMM4*(5&3. DBODFM DMPTF DI
   DBODFM DMPTF DI
   DBODFM DMPTF DI PT&YJU
8. 4JHOBM
   8BUDIFS w 4*(*/5ͱ4*(5&3.Λ؂ࢹ
   Ὂ ड৴ͨ͠Β"1*
   4FSWFSʹ౉ͨ͠DPOUFYU ͷcancel()Λ࣮ߦ
   w sigStopCh Ὂ શମͷॲཧ͕ऴ͔ྃͨ͠Ͳ͏͔ΛݟΔ ▷ ࿈ଓͰγάφϧ͕དྷͯ΋େৎ෉ • golang.org/x/sync/errgroup Ὂ HPSPVUJOFͷ؅ཧ͕͠΍͍͢Α͏ʹ !8 eg, ctx := errgroup.WithContext(context.Background()) srvCtx, srvCancel := context.WithCancel(ctx) sigCh := make(chan os.Signal) sigStopCh := make(chan struct{}) signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM) eg.Go(func() error { defer close(sigCh) for { select { case <-sigStopCh: log.Println("finish signal watching") return nil case sig := <-sigCh: log.Printf("received signal %+v\n", sig) srvCancel() } } })
9. "1*
   4FSWFS w BQJEVNQ͕ୟ͔ΕΔͱɼ
 DumpIds DIBOOFM
   ʹσʔλΛ٧ΊΔ
   Ὂ CMPDL͕ൃੜ͢ΔͷͰຊ౰͸ྑ͘ͳ͍
   w γάφϧʹΑͬͯDUY͕Ωϟϯηϧ͞ΕͨΒɼ Shutdown()ΛݺͿ
   Ὂ ͍͍ײ͡ʹ(SBDFGVM
   4IVUEPXOͯ͘͠ΕΔʁ
   Ὂ ໌ࣔతʹClose()͠ͳ͍ͱ௨৴தͷॲཧ͸
 λΠϜΞ΢τͯ͘͠Εͳ͍ʁ
   w %VNQͷDUYΛΩϟϯηϧ͠ɼ
 DIBOOFMΛด͡Δ !9 func (s *APIServer) Run(...) ... { ... go func() { log.Println("start server") err := srv.ListenAndServe() if err != nil { log.Print(err) } }() defer close(s.DumpIds) defer cancelDump() <-ctx.Done() ctxShutdown, _ := context.WithTimeout(...) if err := srv.Shutdown(ctxShutdown); err != nil { log.Print(err) } log.Println("shutdown server!!") ... }
10. %VNQ
    8PSLFS w DIBOOFM
    dumpIds ʹ٧·͍ͬͯΔ
 σʔλΛҰ୴ୀආ͍ͤͨ͞৔߹͸ɼ
 ctxͷDone()ΛݟͯϋϯυϦϯά͢Δ
    Ὂ dompIds͸DMPTF͞ΕͯΔͷͰɼೖͬͯΔ σʔλΛॲཧ͖͠Ε͹GPS͸ൈ͚Δ
    w ࠷ޙʹ/PUJpDBUJPO
    8PSLFSͷDUYΛ Ωϟϯηϧ͠ɼDIBOOFMΛด͡Δ !10 eg.Go(func() error { defer close(notificationMsgs) defer notificationCancel() defer log.Println("shutdown dump worker") for d := range dumpIds { select { case <-dumpCtx.Done(): // TODO: save dump ids return nil default: time.Sleep(5 * time.Second) log.Printf("dump: %#v\n", d) notificationMsgs <- dumpData(d) } } return nil })
11. /PUJpDBUJPO
    8PSLFS w %VNQ
    8PSLFSͱಉ͡ !11 eg.Go(func() error { defer log.Println("shutdown notification worker") defer close(sigStopCh) for msg := range notificationMsgs { select { case <-notificationCtx.Done(): // TODO: save messages return nil default: time.Sleep(4 * time.Second) sendNotification(msg) log.Printf("notification message: %s\n", msg) } } return nil })
12. ࢀߟ࣮૷ w HJTUHJUIVCDPNUBYJPCDFBECGBCDFEFGB
    w HJUIVCDPNXBOUFEMZTVCFF !12