如何为安全的go grpc服务创建不安全的Java grpc客户端

Question

I am trying to create grpc service client in Java where server is in goLang and deployed with the https . where I am trying to achieve a non-secured connection [I don't want to pass the certificate ]

public class testgrpc {
    ManagedChannel channel ;
    ServiceGrpc.ServiceBlockingStub  blockingStub;
    String host = "remotesecuredhost";
    int port ="XXX";

    @Test
    public void testgrpc()
    {
    channel = ManagedChannelBuilder.forAddress(host,port).build();

     blockingStub = ServiceGrpc.newBlockingStub(channel);

    response =  blockingStub.health(Empty.newBuilder().build());

    }

}

the above code gives following exception

io.grpc.StatusRuntimeException: UNAVAILABLE: io exception
    at io.grpc.stub.ClientCalls.toStatusRuntimeException(ClientCalls.java:221)
    at io.grpc.stub.ClientCalls.getUnchecked(ClientCalls.java:202)
    at io.grpc.stub.ClientCalls.blockingUnaryCall(ClientCalls.java:131)

can someone help with Client code

Answer 1

I have figured out the solution finally , in my case

1. Netty versions were not in sync in my build.gradle , because of that I was receiving the exception as below

Could not find TLS ALPN provider; no working netty-tcnative,
Conscrypt, or Jetty NPN/ALPN available

to resolve this I have setup the versions as followed

grpc-netty - 1.20.x- ||| netty-handler-4.1.34.Final ||| netty-tcnative-boringssl-static version 2.0.22.Final got idea from here

1. for tls connection this works

channel  = NettyChannelBuilder
                .forAddress("host",port)
               .sslContext(GrpcSslContexts.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build())
                .build();

1. for non tls

              channel  = NettyChannelBuilder
            .forAddress("host",port).usePlaintext()
       .build();