我有三个非常简单的微服务（Spring Boot），它们使用gRPC进行通信。我最初编写了两个服务：一个客户端（GreeterClient）和一个服务（GreeterService）。客户端将请求消息传递给服务，该服务将响应返回给客户端。我能够使这两个服务相互配合。
添加第三项服务后，服务组织如下：
GreeterClient：将请求消息传递给GreeterService，期望得到响应。
GreeterService：收到GreeterClient的请求后，调用GreetingProviderService进行“问候”，期望得到响应。收到响应后，将对GreeterClient做出响应并返回。
GreetingProviderService：收到GreeterService的呼叫后，返回响应。
每个微服务都包含在其自己的项目中。第四个项目仅包含定义RPC服务和消息的protobuf文件。每个微服务项目都将此引用为依赖项。
我遇到了一个问题，即GreeterService无法找到GreetingProviderService getGreeting“端点”。 GreeterClient可以轻松找到GreeterService端点。我不知道怎么了
以下是GreeterService控制台的一部分：
2020-01-23 10:52:49.671 DEBUG 5108 --- [-worker-ELG-1-3] io.grpc.netty.NettyClientHandler : [id: 0x758853f0, L:/127.0.0.1:55380 - R:/127.0.0.1:9310] OUTBOUND HEADERS: streamId=3 headers=GrpcHttp2OutboundHeaders[:authority: 127.0.0.1:9310, :path: /edu.mit.ll.GreetingProvider/GetGreeting, :method: POST, :scheme: http, content-type: application/grpc, te: trailers, user-agent: grpc-java-netty/1.25.0, grpc-accept-encoding: gzip] streamDependency=0 weight=16 exclusive=false padding=0 endStream=false 2020-01-23 10:52:49.677 DEBUG 5108 --- [-worker-ELG-1-3] io.grpc.netty.NettyClientHandler : [id: 0x758853f0, L:/127.0.0.1:55380 - R:/127.0.0.1:9310] OUTBOUND DATA: streamId=3 padding=0 endStream=true length=5 bytes=0000000000
2020-01-23 10:52:49.743 DEBUG 5108 --- [-worker-ELG-1-3] io.grpc.netty.NettyClientHandler : [id: 0x758853f0, L:/127.0.0.1:55380 - R:/127.0.0.1:9310] INBOUND HEADERS: streamId=3 headers=GrpcHttp2ResponseHeaders[:status: 200, content-type: application/grpc, grpc-status: 12, grpc-message: Method not found: edu.mit.ll.GreetingProvider/GetGreeting] streamDependency=0 weight=16 exclusive=false padding=0 endStream=true
2020-01-23 10:52:49.751 DEBUG 5108 --- [-worker-ELG-1-3] io.grpc.netty.NettyClientHandler : [id: 0x758853f0, L:/127.0.0.1:55380 - R:/127.0.0.1:9310] OUTBOUND RST_STREAM: streamId=3 errorCode=8
2020-01-23 10:52:49.752 ERROR 5108 --- [ault-executor-0] io.grpc.internal.SerializingExecutor : Exception while executing runnable io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed@1f8dda93
io.grpc.StatusRuntimeException: UNIMPLEMENTED: Method not found: edu.mit.ll.GreetingProvider/GetGreeting
at io.grpc.stub.ClientCalls.toStatusRuntimeException(ClientCalls.java:240)
at io.grpc.stub.ClientCalls.getUnchecked(ClientCalls.java:221)
at io.grpc.stub.ClientCalls.blockingUnaryCall(ClientCalls.java:140)
at edu.mit.ll.grpc.GreetingProviderGrpc$GreetingProviderBlockingStub.getGreeting(GreetingProviderGrpc.java:138)
at edu.mit.ll.service.GreeterService.sayHello(GreeterService.java:46)
at edu.mit.ll.grpc.GreeterGrpc$MethodHandlers.invoke(GreeterGrpc.java:217)
at io.grpc.stub.ServerCalls$UnaryServerCallHandler$UnaryServerCallListener.onHalfClose(ServerCalls.java:172)
at io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.halfClosed(ServerCallImpl.java:331)
at io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed.runInContext(ServerImpl.java:814)
at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Protobuf文件：
greeter.proto：
syntax = "proto3";
option java_multiple_files = true;
option java_package = "edu.mit.ll.grpc";
package edu.mit.ll;
service Greeter {
rpc SayHello (HelloRequest) returns (HelloReply) {}
}
message HelloRequest {
string name = 1;
}
message HelloReply {
string message = 1;
}
provider.proto：
syntax = "proto3";
option java_multiple_files = true;
option java_package = "edu.mit.ll.grpc";
import "google/protobuf/empty.proto";
package edu.mit.ll;
service GreetingProvider {
rpc GetGreeting(google.protobuf.Empty) returns (Greeting) {}
}
message Greeting {
string greeting = 1;
}
GreeterClient.java：
@Service
public class GreeterClient {
...
@PostConstruct
public void init() {
channel = ManagedChannelBuilder.forAddress("127.0.0.1", 9110).usePlaintext()
.keepAliveWithoutCalls(true).build();
greeterStub = GreeterGrpc.newBlockingStub(channel);
taskExecutor.execute(new Runner());
}
private class Runner implements Runnable {
@Override
public void run() {
...
log.info("making request ...");
HelloRequest request = HelloRequest.newBuilder().setName(name).build();
HelloReply reply = greeterStub.sayHello(request);
log.info("reply: {}", reply.getMessage());
...
}
}
}
}
GreeterClient application.yml：
...
grpc:
port: 9210
GreeterService.java：
@GRpcService
public class GreeterService extends GreeterImplBase {
...
@PostConstruct
public void init() {
channel = ManagedChannelBuilder.forAddress("127.0.0.1", 9310).usePlaintext()
.keepAliveWithoutCalls(true).build();
providerStub = GreetingProviderGrpc.newBlockingStub(channel);
}
@Override
public void sayHello(HelloRequest request, StreamObserver<HelloReply> responseObserver) {
Greeting greeting = providerStub.getGreeting(Empty.newBuilder().build());
HelloReply reply = HelloReply.newBuilder().setMessage(greeting + " " + request.getName())
.build();
responseObserver.onNext(reply);
responseObserver.onCompleted();
}
}
GreeterService application.yml：
...
grpc:
port: 9110
GreetingProviderService.java：
public class GreetingProviderService extends GreetingProviderImplBase {
private static final String[] GREETINGS = { ... };
...
@Override
public void getGreeting(Empty request, StreamObserver<Greeting> responseObserver) {
int index = random.nextInt(GREETINGS.length);
Greeting greeting = Greeting.newBuilder().setGreeting(GREETINGS[index]).build();
responseObserver.onNext(greeting);
responseObserver.onCompleted();
}
}
GreetingProviderService application.yml：
...
grpc:
port: 9310
最佳答案
[facepalm]
总是简单的东西。我忽略了将@GRpcService批注添加到GreetingProviderService中。
一旦添加，问题就解决了。