Basic protos for ray client (#11762)

src/ray/protobuf/BUILD

@@ -155,3 +155,15 @@ cc_proto_library(
     deps = [":agent_manager_proto"],
 )
 
+# Ray Client gRPC lib
+proto_library(
+    name = "ray_client_proto",
+    srcs = ["ray_client.proto"],
+    deps = [],
+)
+
+python_grpc_compile(
+    name = "ray_client_py_proto",
+    deps = [":ray_client_proto"]
+)
+

src/ray/protobuf/ray_client.proto

@@ -0,0 +1,67 @@
+// Copyright 2020 The Ray Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package ray.rpc;
+
+enum Type { DEFAULT = 0; }
+
+message Arg {
+  enum Locality {
+    INTERNED = 0;
+    REFERENCE = 1;
+  }
+  Locality local = 1;
+  bytes reference_id = 2;
+  bytes data = 3;
+  Type type = 4;
+}
+
+message ClientTask {
+  // Optionally Provided Task Name
+  string name = 1;
+  bytes payload_id = 2;
+  repeated Arg args = 3;
+}
+
+message ClientTaskTicket {
+  bytes return_id = 1;
+}
+
+message PutRequest {
+  bytes data = 1;
+}
+
+message PutResponse {
+  bytes id = 1;
+}
+
+message GetRequest {
+  bytes id = 1;
+}
+
+message GetResponse {
+  bool valid = 1;
+  bytes data = 2;
+}
+
+service RayletDriver {
+  rpc GetObject(GetRequest) returns (GetResponse) {
+  }
+  rpc PutObject(PutRequest) returns (PutResponse) {
+  }
+  rpc Schedule(ClientTask) returns (ClientTaskTicket) {
+  }
+}