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Shutdown workers
taxio
April 20, 2019
Technology
0
170
Shutdown workers
taxio
April 20, 2019
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Transcript
ґଘํͷ͋Δ 8PSLFSΛཧ͢Δ 6NFEBHP4QSJOH
ґଘํͷ͋Δ 8PSLFSΛཧ͢Δ ࢭΊΔ 6NFEBHP4QSJOH
8JLJΈ͍ͨͳαʔϏεͰΑ͋͘Δͭ w ࣗͷهࣄͷ༰Λશͯμϯϩʔυ͍ͨ͠ Ὂ %VNQϦΫΤετΛૹΔ Ὂ ཪଆͰॲཧΛΒͤΔ Ὂ Ϣʔβʔʹରͯ͠μϯϩʔυՄೳͷ௨ΛૹΔ !3
"1*4FSWFS %VNQ8PSLFS /PUJpDBUJPO 8PSLFS 3FRVFTU ϝʔϧͱ͔
"1*4FSWFS %VNQ8PSLFS /PUJpDBUJPO 8PSLFS 3FRVFTU ϝʔϧͱ͔ DIBOOFM DIBOOFM HSPVUJOF HSPVUJOF
HSPVUJOF
Ͳ͏ͬͯࢭΊΔʁ w 04ͷγάφϧΛݟͯॱ൪ʹࢭΊ͍͖͍ͯͨ w طʹड͚͚ͨ%VNQॲཧऴΘΒ͔ͤͯΒࢭΊ͍ͨ Ὂ ͘͠దʹୀආͤ͞Δ w DPOUFYUΛ͑Ͱ͖ͦ͏ !6
"1*4FSWFS %VNQ8PSLFS /PUJpDBUJPO 8PSLFS 4JHOBM 8BUDIFS TZTDBMM4*(*/5 TZTDBMM4*(5&3. DBODFM DMPTF
DI DBODFM DMPTF DI DBODFM DMPTF DI PT&YJU
4JHOBM8BUDIFS w 4*(*/5ͱ4*(5&3.Λࢹ Ὂ ड৴ͨ͠Β"1*4FSWFSʹͨ͠DPOUFYU ͷcancel()Λ࣮ߦ w sigStopCh Ὂ શମͷॲཧ͕ऴ͔ྃͨ͠Ͳ͏͔ΛݟΔ
▷ ࿈ଓͰγάφϧ͕དྷͯେৎ • golang.org/x/sync/errgroup Ὂ HPSPVUJOFͷཧ͕͍͢͠Α͏ʹ !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() } } })
"1*4FSWFS w BQJEVNQ͕ୟ͔ΕΔͱɼ DumpIds DIBOOFM ʹσʔλΛ٧ΊΔ Ὂ CMPDL͕ൃੜ͢ΔͷͰຊྑ͘ͳ͍ w γάφϧʹΑͬͯDUY͕Ωϟϯηϧ͞ΕͨΒɼ
Shutdown()ΛݺͿ Ὂ ͍͍ײ͡ʹ(SBDFGVM4IVUEPXOͯ͘͠ΕΔʁ Ὂ ໌ࣔతʹClose()͠ͳ͍ͱ௨৴தͷॲཧ λΠϜΞτͯ͘͠Εͳ͍ʁ 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!!") ... }
%VNQ8PSLFS w DIBOOFM dumpIds ʹ٧·͍ͬͯΔ σʔλΛҰ୴ୀආ͍ͤͨ͞߹ɼ ctxͷDone()ΛݟͯϋϯυϦϯά͢Δ Ὂ dompIdsDMPTF͞ΕͯΔͷͰɼೖͬͯΔ σʔλΛॲཧ͖͠ΕGPSൈ͚Δ
w ࠷ޙʹ/PUJpDBUJPO8PSLFSͷDUYΛ 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 })
/PUJpDBUJPO8PSLFS w %VNQ8PSLFSͱಉ͡ !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 })
ࢀߟ࣮ w HJTUHJUIVCDPNUBYJPCDFBECGBCDFEFGB w HJUIVCDPNXBOUFEMZTVCFF !12