初めてのgRPC / Starting gRPC

JJUG CCC 2019 Springでの登壇資料です

1.  , LINE
    
   gRPC JJUG CCC 2019 Spring #ccc_a1 1
2. • LINE 
   
      
    • (Maeda Kentaro) • Twitter: kencharos JJUG CCC 2019 Spring #ccc_a1 2
3. Agenda • gRPC
    • Protocol Buffers  • gRPC Java  • gRPC  JJUG CCC 2019 Spring #ccc_a1 3
4.  &"  l 
    !% gRPC '   #($ ) 4 JJUG CCC 2019 Spring #ccc_a1
5. Agenda • gRPC
    • Protocol Buffres  • gRPC Java  • gRPC  JJUG CCC 2019 Spring #ccc_a1 5
6. 0 / I ) / / ) / / F P l oil l epC ) rc l 2 / R P N F nm l ( F 1 0 / C l 0 /t u g bj da F 6 0 ) CG https://grpc.io/ JJUG CCC 2019 Spring #ccc_a1
7. l e > p • - I >c A B T • > tPT P c DH o B >gp I • D >c DL I BD C B C l u • + ( 2 s • L / )r l f l > RAL g I DH T 7 4/ ) JJUG CCC 2019 Spring #ccc_a1
8. l ) 1 / 2 • ( m UT RU C C l S t C • a • UTe a • L P l n H i • s C L P c P C i 8 JJUG CCC 2019 Spring #ccc_a1
9. ) PR o i hli fi l ) I R nH SR l o rLR+( e g e l +( H tuwJ a yG ld i • ,1B1# ) # # # D# # # D # 0C ### l ptuwJ i i fi • s c b LR v 9 JJUG CCC 2019 Spring #ccc_a1
10. l I L P C D l I R B 10 proto file message (
     ) service (PRC ) protoc Protocol Buffers gRPC plugin 
     Message  Service  Protocol Buffers  gRPC  JJUG CCC 2019 Spring #ccc_a1
11. l e / UWT N l . gab UWT p tP • P ( . / P l / A H NPL T A J l L . / P . UWT w E wEL . / . r LC • A . R O SI • . . / )/ + L o T 11 . / ( / P n JJUG CCC 2019 Spring #ccc_a1
12. Agenda • gRPC
     • Protocol Buffers  • gRPC Java  • gRPC  JJUG CCC 2019 Spring #ccc_a1 12
13. l proto"&A5
    !<;3CLI & • https://github.com/protocolbuffers/protobuf l #%'8F$,B • gRPC
    Open API
    12/B?+ E l gRPC Java :4
    protoc  gradle/maven 0D .=@ 6 
    )7  9 • (*:4>=6  • gRPC-web, gRPC-gateway, doc-gen  Java(-#%' 6:4 • Go, C++  C12!<; :4 13 protoc 
     JJUG CCC 2019 Spring #ccc_a1
14. l gRPC 
     version 3  l   message, RPC  service  ! • package
    Option
    import  "      ! 14 proto 
     syntax = "proto3"; package my.rpc; option java_package = "my.rpc"; message SomeMessage{///} service SomeService{///} JJUG CCC 2019 Spring #ccc_a1
15. l Java  1!'  message 0 8.
    5%*  l Java1! 3249*  15 message
     message Person { int32 id = 1; string name = 2; Gender gender = 3; enum Gender { man = 0; woman = 1; } } 
    -/ int32, int64, uint32, uint64,double, , bool 6(: string : bytes :"$ enum #7 repeated $.  )+ map<key$, value$> message 1!&message  JJUG CCC 2019 Spring #ccc_a1
16. l Protocol Buffers ('.I7+/&H8?K = L9 • +/&,#*0 .-!/$ .-! 36  • +/&H8:NM   l EA Person id150DG  , 08 96 01 (%P 16 
      0000 0100 212)#%6@O5@K
    <+/&H8 = 1 1001 0110 0000 0001 ;C1)#%$"QF>  21(%J
    4B 000 0001 ++ 001 0110 -> 10010110 -> 128 + 16 + 4 + 2 -> 150 JJUG CCC 2019 Spring #ccc_a1
17. l proto #%C?,#%!A2 D8   • " $&' proto <; !:3 0G   • message /=B.#%!A2>)1
    4F E1 • #%!A26E-79 reserved  17 
      //version1 message Something { int32 id = 1; string name = 2; } //version2 *@+ message Something { int32 id = 1; string name = 2[deprecated=true]; string fullName = 3; } //version3 (15 message Something { int32 id = 1; reserved 2; string fullName = 3; } JJUG CCC 2019 Spring #ccc_a1
18. l Java  service & RPC  ' / ,$
    "message
    -%message ( l *"' / stream " -% ).  
    RPC 40 +0 l !# 18 service 
    service GreetingService { rpc Hello(Person) returns (Greeting) rpc HelloStream(stream Person) returns (stream Greeting) } JJUG CCC 2019 Spring #ccc_a1
19. Agenda • gRPC
     • Protocol Buffers  • gRPC Java  • gRPC  JJUG CCC 2019 Spring #ccc_a1 19
20. 20  proto 
     JJUG CCC 2019 Spring #ccc_a1 syntax = "proto3"; // The fizbuz service definition. service FizBuzService { rpc FizBuzOne (InputNumber) returns (FizBuzAnswer) {} rpc FizBuzRange (FromTo) returns (stream FizBuzAnswer) {} rpc FizBuzBatch (stream InputNumber) returns (FizBuzList) {} rpc FizBuzMany (stream InputNumber) returns (stream FizBuzAnswer) {} } message InputNumber { int32 num = 1; } message FizBuzAnswer { string answer = 1; } //
    
21. 21 Protocol Buffers
     JJUG CCC 2019 Spring #ccc_a1 l maven/gradle Protocol Buffers   gRPC plugin $ • src/main/proto  proto " apply plugin: 'com.google.protobuf' apply plugin: "idea" protobuf { protoc { artifact = "com.google.protobuf:protoc: 3.6.1 " } plugins { grpc { // grpc plugin # artifact = "io.grpc:protoc-gen-grpc-java:1.18.1" } } generateProtoTasks { //plugin "
    all()*.plugins { grpc {} // grpc plugin !$ } } ProtocolBuffrers   gRPC plugin#  gRPC plugin!$
22. 22
     JJUG CCC 2019 Spring #ccc_a1 l  build/generated   l gradle     
    • https://github.com/google/pr otobuf-gradle-plugin
23. 23 gRPC Java
     JJUG CCC 2019 Spring #ccc_a1 
     Stub RPCproto'5 .- gRPC Server Stub /12  gRPC Sevice gRPC Server & RPCProto '5.-%
    !3 Server 4: Channel  gRPC Server /1 7,RPC$) #8  message PRC*96 Stub-gRPC Service " 0(+ Protocol Buferes message
24. 24 gRPC Java 
     JJUG CCC 2019 Spring #ccc_a1    Stub Stub gRPC Server gRPC Service gRPC Service Channel RPC RPC message message l Proto 
     
25. 25 
    
    :gRPC Server JJUG CCC 2019 Spring #ccc_a1 l ServerBuilder addService  GrpcService&+ ' •  !$ Netty
    TLS #% NettryServiceBuilder () • RPC"* Netty NIO ! public static void main(String[] args)throws Exception{ var builder = (NettyServerBuilder)ServerBuilder .forPort(6565) .addService(new FizBuzBasicGrpcService()); // builder.sslContext(...); var server = builder.build(); server.start(); server.awaitTermination(); }
26. 26 
    :Channel JJUG CCC 2019 Spring #ccc_a1 l ManagedChannel  * 9 l -  5)8< RPC#3
    .' 2! 1 * ; l gRPC  TLS 4%
    , TLS +/  &
    usePlaintext :"0 $76 .( ManagedChannel createChannel() { return ManagedChannelBuilder.forAddress("localhost", 6565) .usePlaintext() .build(); }
27. 27 
    :Stub JJUG CCC 2019 Spring #ccc_a1 l 1;65 ServiceGrpc (33C $65' !"
      Channel : 65  l 0B-=RPC%*(&?@, • 942/+ BlockingStub  FutureStub0 var blockStub = FizBuzServiceGrpc.newBlockingStub(channel); var futureStub = FizBuzServiceGrpc.newFutureStub(channel); var stub = FizBuzServiceGrpc.newStub(channel); Stub 
    RPC  BlockingStub unary, server side stream <.('!A8) FutureStub unary ><. (Future<T> A8) Stub 7 StreamObsever)#!
28. 28 RPC
     JJUG CCC 2019 Spring #ccc_a1 l RPC6# .;3 stream   RPC(= $ l  !RPC4
    :.87" 0),   • 5+  Unary& 1 • 87"*<9- '/:% RPC RPC
     Unary RPC rpc Hello(In) returns (Out) 121 Server Streaming RPC rpc Hello(In) returns (stream Out) 121 Client Streaming RPC rpc Hello(stream In) returns (Out) 121 Bidirectional Streaming RPC rpc Hello(stream In) returns (stream Out) 121
29. 29 
     RPC  JJUG CCC 2019 Spring #ccc_a1 l %)-,/!1TRPCZI6(&NCH : • (&NCH
    (&NHD (=RPC Da)L[?RP @KY^ • 4TWJ RH>`3  XU8E_ ".*' Y^ l gRPC Java StreamObserver +$ )] F9@KA; • Stub, #*b[RPCQ5  SG  • RPC%&+Bc gRPC E_2d  
    AM7O • <= A;V\0
30. 30 StreamObserver 
     JJUG CCC 2019 Spring #ccc_a1 l 
    2StreamObserver  Stub gRPC Service RPC (Unary ) Stream Observer Stream Observer message message onNext onCompleted onNext onCompleted
31. 31 StreamObserver
     JJUG CCC 2019 Spring #ccc_a1 l onNext : 
     .+0/(+!/ • $2 *# -& 
    .+ • -& *# $2 
    (+ 
     • 
    )3 1,%" l onCompleted : 
    .+ 4 0/!/ • %" RPC '5  l onError : 
    !/
32. 32 Unary RPC JJUG CCC 2019 Spring #ccc_a1 l &*"! + ; 
    # ! + : • 84'")%* 
    /0 1 .2 • &*"7 StreamObserver gRPC!$("36 9-  36,8 Stub gRPC Service RPC5< Stream Observer Stream Observer message message onNext onCompleted onNext onCompleted
33. 33 Unary RPC
     JJUG CCC 2019 Spring #ccc_a1 // Client InputNumber input = InputNumber.newBuilder().setNum(1).build(); FizBuzAnswer a1 = blockStub.fizBuzOne(input); System.out.println(a1.getAnswer()); // Server Unary @Override public void fizBuzOne(InputNumber request, StreamObserver<FizBuzAnswer> responseObserver) { String answer = calc.calc(request.getNum()); // send response to client responseObserver.onNext(FizBuzAnswer.newBuilder().setAnswer(answer).build()); // send RPC finish to client responseObserver.onCompleted(); }
34. 34 ()message  POJO
    JJUG CCC 2019 Spring #ccc_a1 l Protocol Buffers  message  67(immutable) getter 
    setter ,  l message (4 builder +9  l message  AbstractMessage %&-
    "! /"!
    %/8*.  , var num = InputNumber.newBuilder() // builder )1 .setNum(10) // #25 .build(); // message (4 var num2 = InputNumber.newBuilder(num) // $3 builder )1 .setNum(100) // '0 .build(); // (4
35. 35 Server Streaming RPC JJUG CCC 2019 Spring #ccc_a1 l  * 
    (& ) • Unary  onNext(&!# • BlockingStub  Iterator  " $' Stub gRPC Service RPC%+ Stream Observer Stream Observer message message onNext onCompleted onNext onCompleted message onNext
36. Iterator<FizBuzAnswer> a2 = blockStub.fizBuzRange(FromTo.newBuilder().setFrom(2).setTo(20).build()); while (a2.hasNext()) { System.out.println(a2.next().getAnswer()); } // server side stream @Override public void fizBuzRange(FromTo request, StreamObserver<FizBuzAnswer> observer) { var anserList = IntStream.range(request.getFrom(), request.getTo()) .boxed().map(i -> calc.calc(i)).collect(Collectors.toList()); // send stream data for (String answer : anserList) { observer.onNext(FizBuzAnswer.newBuilder().setAnswer(answer).build()); } observer.onCompleted(); } 36 Server Streaming RPC
     JJUG CCC 2019 Spring #ccc_a1
37. 37 Client Streaming RPC JJUG CCC 2019 Spring #ccc_a1 l  ($&
    &"   ) • 
     !%'  Stub gRPC Service RPC#* Stream Observer Stream Observer message onNext onCompleted onCompleted message onNext message onNext
38. 38 Client Streaming RPC
    (Stub) JJUG CCC 2019 Spring #ccc_a1 // 32"(5 #- Latch CountDownLatch waitFinish = new CountDownLatch(1); // RPC %& 1  StreamObserver +/ var requestSender = stub.fizBuzBatch(new StreamObserver<FizBuzList>() { @Override public void onNext(FizBuzList value) { //  1
    Client Streaming 0 System.out.println(“received answers” + value); } @Override public void onCompleted() { waitFinish.countDown(); // !6 '6 } @Override public void onError(Throwable t) {waitFinish.countDown();} }); // ,)4*$ requestSender.onNext(InputNumber.newBuilder().setNum(11).build()); requestSender.onNext(InputNumber.newBuilder().setNum(10).build()); requestSender.onNext(InputNumber.newBuilder().setNum(27).build()); // ,)'6. requestSender.onCompleted(); // RPC '6 waitFinish.await(); ,)  1
39. 39 Client Streaming RPC
    (Server) JJUG CCC 2019 Spring #ccc_a1 @Override public StreamObserver<InputNumber> fizBuzBatch(StreamObserver<FizBuzList> responseObserver) { //   !
     $ var inputNumbers = new ArrayList<InputNumber>(); //   
     
     " return new StreamObserver<InputNumber>() { @Override public void onNext(InputNumber value) { // 
     $  inputNumbers.add(value); } @Override public void onCompleted() { // StubonComplete# var answers = inputNumbers.stream().map(i -> i.getNum()) .map(i -> calc.calc(i)).collect(toList()); responseObserver.onNext(FizBuzList.newBuilder().addAllAnswer(answers).build()); responseObserver.onCompleted(); } @Override public void onError(Throwable t) {t.printStackTrace();} }; } 
     % !
40. 40 Bidirectional Streaming RPC JJUG CCC 2019 Spring #ccc_a1 l "# !:5604  • Ping-Pong $8$%9
    )*2/ 6+   •   onCompleted ( RPC'7  3.& -,;  Stub gRPC Service RPC1< Stream Observer Stream Observer message onNext onCompleted onCompleted message onNext message onNext message onNext
41. var bdRequestSender = stub.fizBuzMany(new StreamObserver<FizBuzAnswer>() { @Override public void onNext(FizBuzAnswer value) { System.out.println("receive " + value.getAnswer()); } @Override public void onCompleted() { waitFinish.countDown(); } @Override public void onError(Throwable t) { waitFinish.countDown(); } }); // receive server data each onNext. bdRequestSender.onNext(InputNumber.newBuilder().setNum(3).build()); bdRequestSender.onNext(InputNumber.newBuilder().setNum(1).build()); bdRequestSender.onNext(InputNumber.newBuilder().setNum(80).build()); // send finish to server. bdRequestSender.onCompleted(); waitFinish.countDown(); 41 Bidirectional Streaming RPC
    (Stub) JJUG CCC 2019 Spring #ccc_a1 
      
    
42. @Override public StreamObserver<InputNumber> fizBuzMany(StreamObserver<FizBuzAnswer> responseObserver) { return new StreamObserver<InputNumber>() { @Override public void onNext(InputNumber value) { // one by one data send. var answer = calc.calc(value.getNum()); responseObserver.onNext( FizBuzAnswer.newBuilder().setAnswer(answer).build()); } @Override public void onCompleted() { responseObserver.onCompleted(); } @Override public void onError(Throwable t) { t.printStackTrace(); } }; } 42 Bidirectional Streaming RPC
    (Server) JJUG CCC 2019 Spring #ccc_a1 
      
43. 43  gRPC 
     JJUG CCC 2019 Spring #ccc_a1 l API ,<9 Request-Response  Unary ,< • 04 *7 l Streaming API=- 
     .:  • 
    #
    6?
     ;)13 • %'!6?
    ;)53? • #2>  /+ 2> $"&'? l Streaming 2> deadline 8(
44. 44 deadline JJUG CCC 2019 Spring #ccc_a1 l
     l Stub - +1deadline 6 2* • RPC'5,. " 0&! '5$(% 0 +1 l Server -   deadline )#/   // deadline  100 4 +1 var blockStub = FizBuzServiceGrpc.newBlockingStub(channel) .withDeadlineAfter(100, TimeUnit.MICROSECONDS); // Server - deadline 31 if(Context.current().getDeadline().isExpired()) { responseObserver.onError(new RuntimeException()); }
45. 45 ( )Stream 
     JJUG CCC 2019 Spring #ccc_a1 l Reactive-gRPC(https://github.com/salesforce/reactive-grpc) • Salesforce gRPC4H
    RxJava/Reactor ; Stub, Service $)BA  • StreamObserver 2O 
    LF6@ $ )BA 
    '%(  
    D ." ' + -!+-.78   • 1K
    ."' +N3 gRPC :>N2O  J
    9M #%*!#% l gRPC-kotlin (https://github.com/rouzwawi/grpc-kotlin) • $/&0;M $)BA  • Stream >NE=/,G5
    <CI $)? 
46. Agenda • gRPC
     • Protocol Buffers  • gRPC Java  • gRPC  JJUG CCC 2019 Spring #ccc_a1 49
47. l API Gateway  API #! l ! REST
    API Gateway REST-gRPC " l  ! gRPC  l   proto   %$ 50
     JJUG CCC 2019 Spring #ccc_a1 Service Service Service API Gateway Browser REST gRPC proto proto proto
48. l gRPC &* "$ • %+ (,   !) • 
    
     
    
     • Protocol Bufferes 
     POJO   gRPC # '  51 
       JJUG CCC 2019 Spring #ccc_a1 Domain Logic gRPC Service Web Controller service message queue gRPC Stub JDBC Other service Database Kafka REST Other service Web Client External WebAPI
49. 2 A . I . I u b l p r t l 2 s . I dl A i go s • 1 1 • 2 AP em 52 . I JJUG CCC 2019 Spring #ccc_a1
50. l - S CmsC PR B R C h gn S P CmsC • B iptb cotBr t P l . :: - S R D • : : :: / • : 2: / :: / • S : 2 P G vI L l S R • - . @ . @ N . / P B B td cot • . :: Nu - aC C y • - . @ t Cel CR 53 . :: - JJUG CCC 2019 Spring #ccc_a1
51. 54 JJUG CCC 2019 Spring #ccc_a1 // GrpcService  Spring  Bean 
     @GRpcService(interceptors = ValidationInterceptor.class) public class FizBuzReactorGrpcService extends ReactorFizBuzServiceGrpc.FizBuzServiceImplBase { // Spring Bean  
     @Autowired private FizBuzCalc cal; @Override public Mono<FizBuzAnswer> fizBuzOne(Mono<InputNumber> request) { return request.map(InputNumber::getNum) .map(cal::calc) .map(a -> FizBuzAnswer.newBuilder().setAnswer(a).build()); }
52. l E / G C 55 JJUG CCC 2019 Spring #ccc_a1 syntax = "proto3"; import "google/api/annotations.proto"; // The fizbuz service definition. service FizBuzService { // calculate Fizbuz Answer rpc FizBuzOne (InputNumber) returns (FizBuzAnswer) { option (google.api.http) = { get: "/fizbuz/{num}" }; } rpc FizBuzRange (FromTo) returns (stream FizBuzAnswer) {} } http  Google api  proto   RPC  http  
    REST    
53. l - 2 B https://github.com/grpc-ecosystem/grpc- gateway S 1 2 Rc ePurR w H fgR a tsPJ 2 R ). - h a • ( j N R aSiT RPC ySp • ) R aSp v Slo • . R a tsPJ HnGO 56 - 2 B JJUG CCC 2019 Spring #ccc_a1
54. l CI2 GO t Ta tS • R RG t S l Gg tS u 2 aGO t • Ch R 2 PlL C l a t CI2 a n L • a C t PlL 2 S Ae lL C 59 t JJUG CCC 2019 Spring #ccc_a1
55. l VP K • R l • R TP l V u C- a g VP K - l V l e H 60 V JJUG CCC 2019 Spring #ccc_a1
56. l B B o B • Pe a BPe v • np g l S P e i • S P e C u • C r • ,, C ce i l Bv t B b B R b 61 Pe a JJUG CCC 2019 Spring #ccc_a1
57. l
     62  
    
    JJUG CCC 2019 Spring #ccc_a1 var stub = FizBuzServiceGrpc.newBlockingStub(ch).withInterceptors( new ClientInterceptor() { public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall( MethodDescriptor<ReqT, RespT> method, CallOptions callOptions, Channel next) { var call = next.newCall(method, callOptions); return new ForwardingClientCall.SimpleForwardingClientCall<>(call){ @Override public void start(Listener<RespT> responseListener, Metadata headers) { // 
     headers.put(Metadata.Key.of("cred", Metadata.ASCII_STRING_MARSHALLER), "password" ); super.start(responseListener, headers); } }; }});
58. l  
     
     63
    
    
    
    JJUG CCC 2019 Spring #ccc_a1 public class AuthenticateInterceptor implements ServerInterceptor { @Override public <ReqT, RespT> Listener<ReqT> interceptCall(ServerCall<ReqT, RespT> call, Metadata headers, ServerCallHandler<ReqT, RespT> next) { var cred = headers.keys().stream().filter(k -> k.equals(“cred”)).findFirst().get(); // Metadata & boolean ok = cred.equals(“password”); // '(, return new ForwardingServerCallListener .SimpleForwardingServerCallListener<ReqT>(next.startCall(call, headers)) { @Override // %$ , ) public void onMessage(ReqT message) { if (ok) { // '(OK ,# super.onMessage(message); } else { // '(NG  "+/ Status status = Status.UNAUTHENTICATED; // '(NG var metadata = new Metadata(); metadata.put( // 0. - Metadata.Key.of(“error_detail”, Metadata.ASCII_STRING_MARSHALLER), “cred invalid”); call.close(status, metadata); // close RPC+/
    *! Status, Metadata " } }
59. l R • P R • C 64 JJUG CCC 2019 Spring #ccc_a1 public <ReqT, RespT> Listener<ReqT> interceptCall( ServerCall<ReqT, RespT> call, Metadata headers, ServerCallHandler<ReqT, RespT> next) { var cred = headers.keys().stream().filter(k -> k.equals("cred")).findFirst().get(); //    var username = getUsrename(cred); // # Context  username % ! var newContext = Context.current().withValue(Context.key("username"), username); //  Context " $
    RPC Context.get("username').get()  return Contexts.interceptCall(newContext, call, headers, next); }
60. l ) 1 . e PD )( ( J . 1 u J l O d P e )( ( lD . 1 t • 2 ai BPD p ) 1 . o D rD d ai P • BP Vfe DG m s P • n ) https://github.com/envoyproxy/protoc-gen-validate/ c i JP D J 65 ai JJUG CCC 2019 Spring #ccc_a1
61. l R l l 66 JJUG CCC 2019 Spring #ccc_a1 // validator.proto syntax = “proto3”; package validator; import “google/protobuf/descriptor.proto”; // 
     range   extend google.protobuf.FieldOptions { Range range = 50000; } // Range  message Range { int32 min = 1; int32 max = 2; } package my.rpc; //  proto import import "validator/validator.proto"; message InputNumber { // 
    Range  int32 num = 1 [(validator.range) = {min:0, max:100}]; }
62. l C 67 JJUG CCC 2019 Spring #ccc_a1 // AbstractMessage 
     % public void checkSample(AbstractMessage message) { // 
     "$ ! Map<FieldDescriptor, Object> fields = message.getAllFields(); fields.forEach((desc, val) -> { // Range #'   ! var rangeOpt = desc.getOptions().getAllFields().values().stream() .filter(v -> v instanceof Range).map(r -> (Range)r).findFirst(); // Range  & rangeOpt.ifPresent(range -> { if (range.getMin() <= (Integer)val && (Integer)val <= range.getMax()) { System.out.println("OK"); } }); }); }
63. l e CH rH p vL H I x 69 p v JJUG CCC 2019 Spring #ccc_a1    
      i 4 nH C vo U v i /2 n C - L / G v o X TR T p v X TR C t sNP /2 7 A H G T k y o
64. l R TH G a SP u l I H G I • e 4 / 2P n G 2P C R G C G • l HhyL 2P w l I L G AC • 4 7 L U S b t nG 70 T a S JJUG CCC 2019 Spring #ccc_a1   gRPC Server A gRPC Server B
     
65. l NR s n Ev g u y D l R s , , h Ek E l llo Ee r SR n i c CD PD 71 SR S a JJUG CCC 2019 Spring #ccc_a1    gRPC Server A gRPC Server B DNS Consul Eureka,, Channel     
      
66. l ) l v ) • v ) no) ( • e e 72 JJUG CCC 2019 Spring #ccc_a1   gRPC Server A gRPC Server B  
    
    envoy envoy envoy xDS
67. l  !!   
      JJUG CCC 2019 Spring #ccc_a1 API Gateway Browser REST gRPC gRPC gateway proto proto proto Spring boot gRPC envoy envoy Spring boot gRPC envoy Spring boot gRPC envoy Envoy 
     
     consul prometheus zipkin elasticsearch 73 73
68. l Google7< .=-4 gPRC  >;6 8*9,0 l proto %( API %
    #+:&) 
    $ %!#  l  "'  2/?5 31  74   JJUG CCC 2019 Spring #ccc_a1
69. $/17. 2(
    *'  • https://grpc.io/ • https://github.com/grpc-ecosystem • https://github.com/grpc/grpc-web • https://developers.google.com/protocol-buffers/ • https://github.com/pseudomuto/protoc-gen-doc • https://github.com/salesforce/reactive-grpc • https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md • https://github.com/envoyproxy/protoc-gen-validate/  0#49-) 3! • https://github.com/kencharos/grpc-sample • gRPC%8
    gRPC-gateway, gRPC-Web, L4L7!5"6+ • https://github.com/kencharos/envoy-service-discovery-spring • envoy
    6+ !
    kotlin
    consul;& 75 *',: JJUG CCC 2019 Spring #ccc_a1
70. THANK YOU