How to enable gRPC-Gateway in Kotlin

Question

I wanted to test out gRPC to potentially swap our existing system to work with it.

The issue

I cloned grpc-kotlin to use their examples and chose to set up hellowworld example. Following all the steps, I initialized the server and everything worked as expected.

I then wanted to add gRPC-Gateway into the mix, as we will need to slowly transition into gRPC from an existing REST architecture.

I'm really new to bazel and gRPC so I tried my best to follow the steps, and tried to add the following into the hello_world.proto.

import "google/api/annotations.proto";

// The greeting service definition.
service Greeter {
  // Sends a greeting
  rpc SayHello (HelloRequest) returns (HelloReply) {
    option (google.api.http) = {
      post: "/v1/example/echo"
      body: "*"
    };
  }
}

Note that when I click into the import "google/api/annotations.proto"; it takes me to the following file: annotations.proto file which seems to be the correct annotations.proto file that I've been meaning to use.

However, when I rebuild, I'm getting the following error: error

What I have tried

I manually copied http.proto and annotations.proto to a folder called google/api/ inside proto as instructed in this thread, but the issue didn't fix itself, as it seems like http.proto is trying to import google/protobuf/descriptor.proto and then I'm getting an error that that file cannot be found.