GRPCの実践と現状での利点欠点 / Go Conference 2016 Spring

Transcript

1. GRPCͷ࣮ફͱ
   ݱঢ়Ͱͷར఺ɾܽ఺
   @kazegusuri / Masahiro Sano
   Go Conference 2016 Spring
   

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2. ࣗݾ঺հ
   w ࠤ໺ਖ਼ߒ !LB[FHVTVSJ
   
   w 43&!.FSDBSJ *OD
   w #BDLFOE4ZTUFNXJUI(P
   w 044ͷ׆ಈ
   w --7.ؔ࿈
   w ,VCFSOFUFT
   w HSQDHBUFXBZ
   

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3. Mercari
   Your Friendly Mobile Marketplace
   

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4. ΞδΣϯμ
   w (31$ͱ͸
   w (13$ͷ࢖͍ํ
   w ຊ൪ಋೖ·Ͱʹߦͬͨ͜ͱ
   w (31$ͷར఺ͱܽ఺
   

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5. GRPC
   w )551Λ࢖ͬͨ൚༻తͳ31$ϑϨʔϜϫʔΫ
   w ೥݄ʹ(PPHMF͕ެ։
   w 1SPUPDPM#V⒎FSͰΠϯλϑΣΠεΛఆٛ
   

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6. GRPCͷ։ൃಈػ
   w 4UVCCZͱ͍͏31$Λ࢖͍ͬͯͨ
   w ࣾ಺γεςϜʹີ݁߹
   w ಉ౳Ҏ্ͷػೳ͕ඪ४ن֨Ͱग़͖ͯͨ
   w ϞόΠϧ΍*P5ɺΫϥ΢υʹద༻
   http://www.grpc.io/posts/principles
   

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7. OSSͰͷ࠾༻ࣄྫ
   w 5FOTPS'MPX (PPHMF
   
   w DPOUBJOFSE %PDLFS
   
   w FUDE $PSF04
   
   w HJUIVCDPNHPLJULJU
   w ࠃ಺اۀͰ΋࠾༻ྫ͸ଟ͍
   

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8. GRPCͷ࢖͍ํ
   w εςοϓ
   QSPUPఆٛΛॻ͘
   QSPUP͔ΒHPΛੜ੒͢Δ
   ΠϯλϑΣΠεΛ࣮૷͢Δ
   (31$αʔόΛىಈ͢Δ
   

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9. protoఆٛΛॻ͘
   w TFSWJDFʹNFUIPEΛ࣋ͨͤΔ
   w ೖग़ྗͷNFTTBHFΛࢦఆ
   syntax = “proto3";
   package echo;
   message EchoMessage {
   string msg = 1;
   }
   service EchoService {
   rpc Echo(EchoMessage) returns (EchoMessage) {}
   }
   

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10. proto͔ΒgoΛੜ੒͢Δ
    w QSPUPDHP@PVUQMVHJOTHSQDFDIPQSPUP
    w NFTTBHF͸TUSVDUʹɺTFSWJDF͸JOUFSGBDFʹ
    type EchoMessage struct {
    Msg string `protobuf:"bytes,1,opt,name=msg" json:"msg,omitempty"`
    }
    type EchoServiceServer interface {
    Echo(context.Context, *EchoMessage) (*EchoMessage, error)
    }
    

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11. ΠϯλϑΣΠεΛ࣮૷͢Δ
    w &DIPؔ਺Λ࣋ͭTUSVDUΛ࣮૷
    w Τϥʔ͸ઐ༻ͷεςʔλεΛฦ͢
    type EchoServer struct{}
    func (s *EchoServer) Echo(ctx context.Context, in *pb.EchoMessage)
    (*pb.EchoMessage, error) {
    if in.Msg == "" {
    return nil, grpc.Errorf(codes.InvalidArgument, "message is empty")
    }
    return &pb.EchoMessage{
    Msg: in.Msg,
    }, nil
    }
    

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12. GRPCαʔόΛىಈ͢Δ
    w HSQD4FSWFSʹTFSWJDFΛొ࿥
    w OFU-JTUFOFSΛ౉ͯ͠4FSWF
    func main() {
    echoServer := &server.EchoServer{}
    s := grpc.NewServer()
    pb.RegisterEchoServiceServer(s, echoServer)
    lis, _ := net.Listen("tcp", ":8080")
    s.Serve(lis)
    }
    

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13. ຊ൪ಋೖ·Ͱʹߦͬͨ͜ͱ
    • ॲཧͷڞ௨Խ
    • Τϥʔॲཧ
    • ੑೳݕূ
    • ϦΫΤετ෼ࢄ
    • grpc-gateway
    

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14. ϦΫΤετॲཧͷϨΠϠԽ
    w શͯͷNFUIPEͰڞ௨ͷॲཧΛߦ͍͍ͨ
    w MPHHJOHೝূͳͲ
    w TFSWJDFͷΠϯλϑΣΠεΛ࣋ͭϋϯυϥΛ࡞੒
    w IUUQͰͷ4FSWF)551Λఏڙ͢Δϋϯυϥ
    

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15. ϦΫΤετϋϯυϥ
    w -PHHJOH)BOEMFS
    w *OTUSVNFOUBUJPO)BOEMFS
    w $SBTI)BOEMFS
    w "VUIFOUJDBUJPO)BOEMFS
    w 4FSWJDF)BOEMFS
    

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16. Logging: ΞΫηεϩά
    w ֤छ஋Λϩάʹอଘ
    w TFSWJDF໊΍NFUIPE໊
    w ϦΫΤετ࣌ؒ
    w εςʔλείʔυͱΤϥʔϝοηʔδ
    w ϦϞʔτΞυϨε
    w MPHHFS͸ࣗલͰ࣮૷
    

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17. Logging: ΞϓϦέʔγϣϯϩά
    w ΞϓϦέʔγϣϯϩάʹίϯςΩετΛ௥Ճ
    w TFSWJDFNFUIPE໊ɺ6TFS*%ͳͲ
    w HJUIVCDPNHPLJULJUMPH
    w HPMBOHPSHYOFUDPOUFYUʹMPHHFSΛηοτ
    

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18. Instrumentation Handler
    w QSPNFUIFVT
    w JOTUSVNFOUBUJPOϥΠϒϥϦͱͯ͠ར༻
    w ϦΫΤετճ਺ɾ࣌ؒΤϥʔճ਺
    w औಘͨ͠ϝτϦΫε͸)551Ͱఏڙ
    

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19. Crash Handler
    w ϦΫΤετॲཧதͷQBOJDΛSFDPWFS
    w *OUFSOBMΤϥʔͱͯ͠ฦ͢
    w ΞϓϦέʔγϣϯϩάʹελοΫτϨʔε
    w *OUFSOBMΤϥʔ͸ϩά؂ࢹͰϞχλϦϯά
    

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20. Authentication Handler
    w NFUBEBUBΛ࢖ͬͨೝূ
    w Ϣʔβ৘ใΛDPOUFYUʹηοτ
    w DSFEFOUJBMTͷػೳ͸࢖͍ͬͯͳ͍
    

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21. Τϥʔͷฦ͠ํ
    • Τϥʔ࣌͸message͕ฦͤͳ͍
    • εςʔλείʔυͱΤϥʔϝοηʔδͷΈ
    return nil, grpc.Errorf(codes.InvalidArgument, "message is empty")
    εςʔλείʔυ Τϥʔϝοηʔδ
    ແࢹ͞ΕΔ
    

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22. Metadata
    w )FBEFSͱ5SBJMFS
    w ϦΫΤετ࣌͸)FBEFSͷΈ
    w Ϩεϙϯε࣌͸)FBEFSͱ5SBJMFS͕ར༻Մೳ
    w ৄࡉͳΤϥʔ৘ใ͸5SBJMFSΛར༻
    md := metadata.Pairs(
    “error”, "ValidationError",
    “message", "message is empty")
    grpc.SetTrailer(md)
    

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23. ύϑΥʔϚϯε
    w FDIPαʔόͰ,SFRT
    w MPHHJOHJOTUSVNFOUBUJPOؚΉ
    w ೝূ ॺ໊ݕূ
    Λ͍Εͯ΋,SFRT
    w NT͔͔Βͳ͍
    w %#ΞΫηεΛؚΉ࣮ࡍͷॲཧͰ΋,SFRT
    

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24. ϩʔυόϥϯε
    w ෳ਺αʔόʹϦΫΤετΛ෼ࢄ
    w )551ͷ··(31$αʔόʹ௨৴
    w ϦΫΤετݩͷ*1ΞυϨεΛ౉͍ͨ͠
    

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25. nginx TCP Load Balancing
    w OHJOY͔ΒTUSFBNNPEVMFΛαϙʔτ
    w VQTUSFBNʹ*1ΞυϨεΛ౉͢ͷ͕՝୊
    w 9'PXBSEFE'PS
    w 51SPYZ 5SBOTQBSFOU1SPYZ
    
    w 1309:QSPUPDPM
    

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26. PROXY protocol
    w 5$1ϨϕϧͰ*1ΞυϨεͱϙʔτΛνΣΠϯ
    w ΫϥΠΞϯτଆͷରԠ͕ඞཁ
    w HPͰ͸HJUIVCDPNBSNPOHPQSPYZQSPUP
    w OFU-JTUFOFSͷϥούʔͳͷͰ؆୯
    list, err := net.Listen("tcp", "...")
    proxyList := &proxyproto.Listener{list}
    conn, err := proxyList.Accept()
    

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27. grpc-gateway
    w +40/͔Β(31$΁ม׵͢ΔϦόʔεϓϩΩγ
    w QSPUP͔Βࣗಈੜ੒
    w 3&45"1*Λఏڙ͍ͨ͠৔߹ʹศར
    w ಛʹσόοάʹศར
    

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28. grpc-gatewayͷఆٛํ๏
    message SimpleMessage {
    string id = 1;
    }
    service EchoService {
    rpc Echo(SimpleMessage) returns (SimpleMessage) {
    option (google.api.http) = {
    post: "/v1/example/echo/{id}"
    };
    }
    rpc EchoBody(SimpleMessage) returns (SimpleMessage) {
    option (google.api.http) = {
    post: "/v1/example/echo_body"
    body: "*"
    };
    }
    }
    

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29. grpc-gateway
    w Կ΋ߟ͑ͳ͍ઃఆ͕͓͢͢Ί
    w 63-͸TFSWJDF໊NFUIPE໊
    w NFTTBHF͸શ෦1045Ͱ౉͢
    w ਏ͍ͱ͜Ζ΋͋Δ
    w ϔομʔͱNFUBEBUBͷѻ͍
    w QSPUPͰఆٛ͞ΕΔKTPO͕શͯPNJUFNQUZ
    

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30. GRPCͷܽ఺
    w ϛυϧ΢ΣΞ͕ͳ͍ɺͦ΋ͦ΋࡞ΓͮΒ͍
    w ΞΫηεϩάͳͲ
    w DVSM͕࢖͑ͳ͍
    w υΩϡϝϯτ͕গͳ͍
    w ιʔεΛಡΉͱ࣮͸͜Μͳػೳ͕ʜ
    w ݴޠຖͷ׬੒౓΍ػೳ͕ҧ͏
    

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31. GRPCͷར఺
    w ࣮૷ʹूதͰ͖Δ
    w ϧʔςΟϯάɺFODEFD͕ࣗಈ
    w ΫϥΠΞϯτ͕࡞Γ΍͍͢
    w ςετ΍ଟݴޠͷରԠ
    w ܽ఺ͷ෦෼΋ͳΜͱ͔ͳΔ
    

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32. GRPC͸݁ہ͓͢͢Ίͳͷ͔ʁ
    w ͔ͳΓ͓͢͢Ί
    w JOUFSDFQUPS͕ೖΕ͹΄΅՝୊͸ͳ͘ͳΔ
    w ϚΠΫϩαʔϏεͷ͓ڙʹ
    w ΋͏ී௨ͷ3&45"1*ʹ͸໭Γͨ͘ͳ͍
    w +40/ʹରԠ͢ΔܕΛ౎౓ॻ͘ख͕ؒݮΔ
    w (31$͸͍͍ͧ
    

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33. GoΤϯδχΞืूʂ
    Backend System Engineer
    https://www.mercari.com/jp/jobs/backend/
    

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