add health service

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

@@ -24,6 +24,12 @@ import { AuthenticationPresenter } from './authentication.presenter';
 import { RpcValidationPipe } from '../../../../utils/pipes/rpc.validation-pipe';
 import { UsernamePresenter } from './username.presenter';
 
+enum ServingStatus {
+  UNKNOWN = 0,
+  SERVING = 1,
+  NOT_SERVING = 2,
+}
+
 @UsePipes(
   new RpcValidationPipe({
     whitelist: true,
@@ -185,4 +191,11 @@ export class AuthenticationController {
       });
     }
   }
+
+  @GrpcMethod('Health', 'Check')
+  async check(): Promise<{ status: ServingStatus }> {
+    return {
+      status: ServingStatus.SERVING,
+    };
+  }
 }

src/modules/authentication/adapters/primaries/authentication.proto

@@ -40,3 +40,20 @@ message Uuid {
 }
 
 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;
+}