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イメージで理解するgRPC
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Daiki Nojiri
May 23, 2020
Programming
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イメージで理解するgRPC
Daiki Nojiri
May 23, 2020
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Transcript
ΠϝʔδͰཧղ͢Δ
ࠓͷΰʔϧ ɾH31$ͬͯͳʹʁ ɾ31$ͬͯͳʹʁ ɾͲ͏࣮ͬͯ͢Δͷʁ
ͬͯͳʹʁ
H31$ (PPHMF͕࡞ͬͨ31$ϑϨʔϜϫʔΫ
31$ͬͯͳʹʁ
31$ 3FNPUF1SPDFEVSF$BMM
31$ DMJFOU͕ࣗͷϝιουΛ࣮ߦ͢Δײ֮Ͱ TFSWFS্ͷϝιουΛ࣮ߦͰ͖Δ͘͠Έ
ͭ·ΓɺͲ͏͍͏͜ͱʁ
DMJFOUͱTFSWFSʹಉ໊ϝιου͕͋ͬͯ IUUQTJDPOTDPNJDPOTTFUTFSWFS DMJFOU TFSWFS Find() Find()
DMJFOU͕ϝιουΛ࣮ߦ͢Δͱ DMJFOU TFSWFS Find() Find() IUUQTJDPOTDPNJDPOTTFUTFSWFS
TFSWFSଆͷಉ໊ϝιου͕࣮ߦ͞Ε DMJFOU TFSWFS Find() Find() SFRVFTU IUUQTJDPOTDPNJDPOTTFUTFSWFS
ͦͷฦΓ͕DMJFOUଆͷฦΓʹͳΔ DMJFOU TFSWFS Find() Find() SFRVFTU SFTQPOTF IUUQTJDPOTDPNJDPOTTFUTFSWFS
H31$͜ͷؒΛ͏·ͬͯ͘͘ΕΔ DMJFOU TFSWFS Find() Find() SFRVFTU SFTQPOTF IUUQTJDPOTDPNJDPOTTFUTFSWFS
const res = axios.get("/api/v1/users/1") js req := FindRequest({ID: 1}) res,
err = user.Find(req) go 3&45 31$ ͜Μͳ͍ํ͕Ͱ͖·͢
Ͳ͏࣮ͬͯ͢Δͷʁ
31$Λ࣮ݱ͢Δʹ SFRVFTU DMJFOU TFSWFS SFTQPOTF IUUQTJDPOTDPNJDPOTTFUTFSWFS
ڞ௨ೝ͕ࣝඞཁ SFRVFTU DMJFOU TFSWFS SFTQPOTF ϝιουͷ໊લ ϦΫΤετͷܗࣜ Ϩεϙϯεͷܗࣜ IUUQTJDPOTDPNJDPOTTFUTFSWFS
ͦΕ͕ɺQSPUPϑΝΠϧ SFRVFTU DMJFOU TFSWFS SFTQPOTF QSPUP IUUQTJDPOTDPNJDPOTTFUTFSWFS
QSPUPϑΝΠϧͷྫ service User { rpc Find(FindRequest) returns (FindResponse) {} }
message FindRequest { int32 id = 1; } message FindResponse { string name = 1; } user_service.proto
QSPUPϑΝΠϧͷྫ user_service.proto ϦΫΤετͷܗࣜ Ϩεϙϯεͷܗࣜ service User { rpc Find(FindRequest) returns
(FindResponse) {} } message FindRequest { int32 id = 1; } message FindResponse { string name = 1; }
service User { rpc Find(FindRequest) returns (FindResponse) {} } message
FindRequest { int32 id = 1; } message FindResponse { string name = 1; } QSPUPϑΝΠϧͷྫ user_service.proto ˢϝιουͷఆٛ
QSPUP QCHP ࣍ʹɺΠϯλʔϑΣʔεΛੜ͢Δ QSPUPD QSPUPDΠϯλʔϑΣʔεΛੜ͢ΔͨΊͷίϚϯυ
QSPUP QCHP ࣍ʹɺΠϯλʔϑΣʔεΛੜ͢Δ QSPUPD ͍ΖΜͳJOUFSGBDFGVOD͕ࣗಈੜ ͞ΕΔɽਓҰ͍͡Βͳ͍
ॏཁͳ෦͚ͩϐοΫΞοϓ type UserServer interface { Find( context.Context, *FindRequest ) (*FindResponse,
error) } user_service.pb.go αʔόଆͷΠϯλʔϑΣʔε αʔόଆ͜Εʹ߹ΘͤͯϝιουΛ࣮͢Δ
ॏཁͳ෦͚ͩϐοΫΞοϓ type UserClient interface { Find( ctx context.Context, in *FindRequest,
opts ...grpc.CallOption ) (*FindResponse, error) } ΫϥΠΞϯτଆͷΠϯλʔϑΣʔε ΫϥΠΞϯτଆ͜Εʹ߹ΘͤͯϝιουΛ͏ user_service.pb.go
ॏཁͳ෦͚ͩϐοΫΞοϓ func (c *userClient) Find( ctx context.Context, in *FindRequest, opts
...grpc.CallOption ) (*FindResponse, error) { out := new(FindResponse) err := c.cc.Invoke( ctx, "/user_service.User/Find", in, out, opts... ) if err != nil { return nil, err } return out, nil } ΫϥΠΞϯτଆͷϝιου ΫϥΠΞϯτଆ͕ݺͼग़͢ϝιου࣮ࡁΈ user_service.pb.go
QSPUP QCHP ͪͳΈʹɺෳݴޠʹରԠ͍ͯ͠Δ SC KBWB
αʔόଆͷ͍ํ ؆ུ൛ import pb "path/to/pb.go" type server struct{} func (s
*server) Find( ctx context.Context, in *pb.FindRequest ) (*pb.FindResponse, error) { user := db.Find(&user) out := &pb.FindResponse{name: user.name} return out, nil } s := grpc.NewServer() pb.RegisterUserServer(s, &server{}) s.Serve(lis) server/main.go
import pb "path/to/pb.go" type server struct{} func (s *server) Find(
ctx context.Context, in *pb.FindRequest ) (*pb.FindResponse, error) { user := db.Find(&user) out := &pb.FindResponse{name: user.name} return out, nil } s := grpc.NewServer() pb.RegisterUserServer(s, &server{}) s.Serve(lis) αʔόଆͷ͍ํ ؆ུ൛ server/main.go %#͔ΒΛ औಘͯ͠ฦ͢ αʔόͷ্ཱͪ͛
ΫϥΠΞϯτଆͷ͍ํ ؆ུ൛ import pb "path/to/pb.go" c := pb.NewUserClient(conn) req :=
&pb.FindRequest{ id: 1, } resp, err := c.Find(context.Background(), req) if err != nil { log.Fatal(err) } log.Println("Name: ", resp.name) // #=> Name: alice client/main.go
ΫϥΠΞϯτଆͷ͍ํ ؆ུ൛ import pb "path/to/pb.go" c := pb.NewUserClient(conn) req :=
&pb.FindRequest{ Name: "alice", } resp, err := c.Find(context.Background(), req) if err != nil { log.Fatal(err) } log.Println("Name: ", resp.name) // #=> Name: alice client/main.go αʔόଆͷFind()ͷฦΓ
ࠓͷ·ͱΊ H31$ͬͯͳʹʁ ˠ(PPHMF͕࡞ͬͨ31$ϑϨʔϜϫʔΫ 31$ͬͯͳʹʁ ˠΫϥΠΞϯτ͔ΒαʔόͷϝιουΛݺͿ H31$Λ͏ʹʁ ˠQSPUPϑΝΠϧΛॻ͍ͯΠϯλʔϑΣʔεΛ ɹੜ͢Δ ˠੜ͞ΕͨΠϯλʔϑΣʔεΛ࣮ͬͯ͢Δ