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

1. GRPCͷ࣮ફͱ ݱঢ়Ͱͷར఺ɾܽ఺ @kazegusuri / Masahiro Sano Go Conference 2016 Spring
2. ࣗݾ঺հ w ࠤ໺
   ਖ਼ߒ !LB[FHVTVSJ
   w 43&!.FSDBSJ
   *OD
   w #BDLFOE
   4ZTUFN
   XJUI
   (P
   w 044ͷ׆ಈ
   w --7.ؔ࿈
   w ,VCFSOFUFT
   w HSQDHBUFXBZ
3. Mercari Your Friendly Mobile Marketplace
4. ΞδΣϯμ w (31$ͱ͸
   w (13$ͷ࢖͍ํ
   w ຊ൪ಋೖ·Ͱʹߦͬͨ͜ͱ
   w (31$ͷར఺ͱܽ఺
5. GRPC w )551Λ࢖ͬͨ൚༻తͳ31$ϑϨʔϜϫʔΫ
   w ೥݄ʹ(PPHMF͕ެ։
   w 1SPUPDPM
   #V⒎FSͰΠϯλϑΣΠεΛఆٛ
6. GRPCͷ։ൃಈػ w 4UVCCZͱ͍͏31$Λ࢖͍ͬͯͨ
   w ࣾ಺γεςϜʹີ݁߹
   w ಉ౳Ҏ্ͷػೳ͕ඪ४ن֨Ͱग़͖ͯͨ
   w ϞόΠϧ΍*P5ɺΫϥ΢υʹద༻ http://www.grpc.io/posts/principles
7. OSSͰͷ࠾༻ࣄྫ w 5FOTPS'MPX
   (PPHMF
   w DPOUBJOFSE
   %PDLFS
   
   w FUDE
   $PSF04
   w HJUIVCDPNHPLJULJU
   w ࠃ಺اۀͰ΋࠾༻ྫ͸ଟ͍
8. GRPCͷ࢖͍ํ w 
   εςοϓ
    QSPUPఆٛΛॻ͘
    QSPUP͔ΒHPΛੜ੒͢Δ
    ΠϯλϑΣΠεΛ࣮૷͢Δ
    (31$αʔόΛىಈ͢Δ
9. protoఆٛΛॻ͘ w TFSWJDFʹNFUIPEΛ࣋ͨͤΔ
   w ೖग़ྗͷNFTTBHFΛࢦఆ syntax = “proto3"; package echo; message EchoMessage { string msg = 1; } service EchoService { rpc Echo(EchoMessage) returns (EchoMessage) {} }
10. proto͔ΒgoΛੜ੒͢Δ w 
    QSPUPD
    HP@PVUQMVHJOTHSQD
    FDIPQSPUP
    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) }
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 }
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) }
13. ຊ൪ಋೖ·Ͱʹߦͬͨ͜ͱ • ॲཧͷڞ௨Խ • Τϥʔॲཧ • ੑೳݕূ • ϦΫΤετ෼ࢄ • grpc-gateway
14. ϦΫΤετॲཧͷϨΠϠԽ w શͯͷNFUIPEͰڞ௨ͷॲཧΛߦ͍͍ͨ
    w MPHHJOHೝূͳͲ
    w TFSWJDFͷΠϯλϑΣΠεΛ࣋ͭϋϯυϥΛ࡞੒
    w IUUQͰͷ4FSWF)551Λఏڙ͢Δϋϯυϥ
15. ϦΫΤετϋϯυϥ w -PHHJOH
    )BOEMFS
    w *OTUSVNFOUBUJPO
    )BOEMFS
    w $SBTI
    )BOEMFS
    w "VUIFOUJDBUJPO
    )BOEMFS
    w 4FSWJDF
    )BOEMFS
16. Logging: ΞΫηεϩά w ֤छ஋Λϩάʹอଘ
    w TFSWJDF໊΍NFUIPE໊
    w ϦΫΤετ࣌ؒ
    w εςʔλείʔυͱΤϥʔϝοηʔδ
    w ϦϞʔτΞυϨε
    w MPHHFS͸ࣗલͰ࣮૷
17. Logging: ΞϓϦέʔγϣϯϩά w ΞϓϦέʔγϣϯϩάʹίϯςΩετΛ௥Ճ
    w TFSWJDFNFUIPE໊ɺ6TFS*%ͳͲ
    w HJUIVCDPNHPLJULJUMPH
    w HPMBOHPSHYOFUDPOUFYUʹMPHHFSΛηοτ
18. Instrumentation Handler w QSPNFUIFVT
    w JOTUSVNFOUBUJPOϥΠϒϥϦͱͯ͠ར༻
    w ϦΫΤετճ਺ɾ࣌ؒΤϥʔճ਺
    w औಘͨ͠ϝτϦΫε͸)551Ͱఏڙ
19. Crash Handler w ϦΫΤετॲཧதͷQBOJDΛSFDPWFS
    w *OUFSOBMΤϥʔͱͯ͠ฦ͢
    w ΞϓϦέʔγϣϯϩάʹελοΫτϨʔε
    w *OUFSOBMΤϥʔ͸ϩά؂ࢹͰϞχλϦϯά
20. Authentication Handler w NFUBEBUBΛ࢖ͬͨೝূ
    w Ϣʔβ৘ใΛDPOUFYUʹηοτ
    w DSFEFOUJBMTͷػೳ͸࢖͍ͬͯͳ͍
21. Τϥʔͷฦ͠ํ • Τϥʔ࣌͸message͕ฦͤͳ͍ • εςʔλείʔυͱΤϥʔϝοηʔδͷΈ return nil, grpc.Errorf(codes.InvalidArgument, "message is empty") εςʔλείʔυ Τϥʔϝοηʔδ ແࢹ͞ΕΔ
22. Metadata w )FBEFSͱ5SBJMFS
    w ϦΫΤετ࣌͸)FBEFSͷΈ
    w Ϩεϙϯε࣌͸)FBEFSͱ5SBJMFS͕ར༻Մೳ
    w ৄࡉͳΤϥʔ৘ใ͸5SBJMFSΛར༻ md := metadata.Pairs( “error”, "ValidationError", “message", "message is empty") grpc.SetTrailer(md)
23. ύϑΥʔϚϯε w FDIPαʔόͰ,SFRT
    w MPHHJOHJOTUSVNFOUBUJPOؚΉ
    w ೝূ ॺ໊ݕূ Λ͍Εͯ΋,SFRT
    w NT͔͔Βͳ͍
    w %#ΞΫηεΛؚΉ࣮ࡍͷॲཧͰ΋,SFRT
24. ϩʔυόϥϯε w ෳ਺αʔόʹϦΫΤετΛ෼ࢄ
    w )551ͷ··(31$αʔόʹ௨৴
    w ϦΫΤετݩͷ*1ΞυϨεΛ౉͍ͨ͠
25. nginx TCP Load Balancing w OHJOY
    ͔ΒTUSFBN
    NPEVMFΛαϙʔτ
    w VQTUSFBNʹ*1ΞυϨεΛ౉͢ͷ͕՝୊
    w 9'PXBSEFE'PS
    w 51SPYZ 5SBOTQBSFOU
    1SPYZ
    w 1309:
    QSPUPDPM
26. PROXY protocol w 5$1ϨϕϧͰ*1ΞυϨεͱϙʔτΛνΣΠϯ
    w ΫϥΠΞϯτଆͷରԠ͕ඞཁ
    w HPͰ͸
    HJUIVCDPNBSNPOHPQSPYZQSPUP
    w OFU-JTUFOFSͷϥούʔͳͷͰ؆୯ list, err := net.Listen("tcp", "...") proxyList := &proxyproto.Listener{list} conn, err := proxyList.Accept()
27. grpc-gateway w +40/͔Β(31$΁ม׵͢ΔϦόʔεϓϩΩγ
    w QSPUP͔Βࣗಈੜ੒
    w 3&45
    "1*Λఏڙ͍ͨ͠৔߹ʹศར
    w ಛʹσόοάʹศར
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: "*" }; } }
29. grpc-gateway w Կ΋ߟ͑ͳ͍ઃఆ͕͓͢͢Ί
    w 63-͸
    TFSWJDF໊NFUIPE໊
    w NFTTBHF͸શ෦1045Ͱ౉͢
    w ਏ͍ͱ͜Ζ΋͋Δ
    w ϔομʔͱNFUBEBUBͷѻ͍
    w QSPUPͰఆٛ͞ΕΔKTPO͕શͯPNJUFNQUZ
30. GRPCͷܽ఺ w ϛυϧ΢ΣΞ͕ͳ͍ɺͦ΋ͦ΋࡞ΓͮΒ͍
    w ΞΫηεϩάͳͲ
    w DVSM͕࢖͑ͳ͍
    w υΩϡϝϯτ͕গͳ͍
    w ιʔεΛಡΉͱ࣮͸͜Μͳػೳ͕ʜ
    w ݴޠຖͷ׬੒౓΍ػೳ͕ҧ͏
31. GRPCͷར఺ w ࣮૷ʹूதͰ͖Δ
    w ϧʔςΟϯάɺFODEFD͕ࣗಈ
    w ΫϥΠΞϯτ͕࡞Γ΍͍͢
    w ςετ΍ଟݴޠͷରԠ
    w ܽ఺ͷ෦෼΋ͳΜͱ͔ͳΔ
32. GRPC͸݁ہ͓͢͢Ίͳͷ͔ʁ w ͔ͳΓ͓͢͢Ί
    w JOUFSDFQUPS͕ೖΕ͹΄΅՝୊͸ͳ͘ͳΔ
    w ϚΠΫϩαʔϏεͷ͓ڙʹ
    w ΋͏ී௨ͷ3&45
    "1*ʹ͸໭Γͨ͘ͳ͍
    w +40/ʹରԠ͢ΔܕΛ౎౓ॻ͘ख͕ؒݮΔ
    w (31$͸͍͍ͧ
33. GoΤϯδχΞืूʂ Backend System Engineer https://www.mercari.com/jp/jobs/backend/