Add server_status message to the raft peering service

proto/BUILD

@@ -31,6 +31,9 @@ proto_library(
 proto_library(
     name = "raft-peering-proto",
     srcs = [":raft-peering.proto"],
+    deps = [
+        ":server-proto",
+    ],
 )
 
 proto_library(

proto/raft-peering-service.proto

@@ -1,9 +1,14 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
 syntax = "proto3";
 
 import "proto/raft-peering.proto";
 
 package typedb.protocol;
 
 service RaftPeering {
-  rpc Peering(PeeringRequest) returns (PeeringResponse);
+  rpc peering (Peering.Req) returns (Peering.Res);
+  rpc server_status (ServerStatus.Req) returns (ServerStatus.Res);
 }

proto/raft-peering.proto

@@ -1,12 +1,31 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
 syntax = "proto3";
 
 package typedb.protocol;
 
-message PeeringRequest {
-  uint64 from_id = 1;
-  string from_address = 2;
-  bytes message = 3;
+import "proto/server.proto";
+
+message Peering {
+    message Req {
+        uint64 from_id = 1;
+        string from_address = 2;
+        bytes message = 3;
+    }
+
+    message Res {}
 }
 
-message PeeringResponse {
+message ServerStatus {
+    message Req {}
+
+    message Res {
+        // TODO: Currently, it's identical to Server. But it won't necessarily be the case forever, so these fields are
+        // split. Additionally, we want to highlight that the address is the connection address.
+        // TODO: We may move ReplicaStatus somewhere else now...
+        string connection_address = 1;
+        Server.ReplicaStatus replica_status = 2;
+    }
 }