add health service

src/modules/users/adapters/primaries/user.proto

@@ -33,3 +33,20 @@ message Users {
 }
 
 message Empty {}
+
+service Health {
+  rpc Check(HealthCheckRequest) returns (HealthCheckResponse);
+}
+
+message HealthCheckRequest {
+  string service = 1;
+}
+
+message HealthCheckResponse {
+  enum ServingStatus {
+    UNKNOWN = 0;
+    SERVING = 1;
+    NOT_SERVING = 2;
+  }
+  ServingStatus status = 1;
+}

src/modules/users/adapters/primaries/users.controller.ts

@@ -24,6 +24,12 @@ import { UserPresenter } from './user.presenter';
 import { ICollection } from '../../../database/src/interfaces/collection.interface';
 import { RpcValidationPipe } from '../../../../utils/pipes/rpc.validation-pipe';
 
+enum ServingStatus {
+  UNKNOWN = 0,
+  SERVING = 1,
+  NOT_SERVING = 2,
+}
+
 @UsePipes(
   new RpcValidationPipe({
     whitelist: true,
@@ -123,4 +129,11 @@ export class UsersController {
       throw new RpcException({});
     }
   }
+
+  @GrpcMethod('Health', 'Check')
+  async check(): Promise<{ status: ServingStatus }> {
+    return {
+      status: ServingStatus.SERVING,
+    };
+  }
 }