/*

* SPDX-License-Identifier: Apache-2.0

* Copyright 2018-2019 The Feast 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

*

* https://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.

*/

package feast.serving.service.controller;

import com.google.inject.Inject;

import feast.proto.serving.ServingAPIProto.GetFeastServingInfoRequest;

import feast.serving.service.ServingServiceV2;

import io.grpc.health.v1.HealthGrpc.HealthImplBase;

import io.grpc.health.v1.HealthProto.HealthCheckRequest;

import io.grpc.health.v1.HealthProto.HealthCheckResponse;

import io.grpc.health.v1.HealthProto.ServingStatus;

import io.grpc.stub.StreamObserver;

// Reference: https://github.com/grpc/grpc/blob/master/doc/health-checking.md

public class HealthServiceController extends HealthImplBase {

private final ServingServiceV2 servingService;

@Inject

public HealthServiceController(final ServingServiceV2 servingService) {

this.servingService = servingService;

}

@Override

public void check(

HealthCheckRequest request, StreamObserver<HealthCheckResponse> responseObserver) {

// TODO: Implement proper logic to determine if ServingServiceV2 is healthy e.g.

// if it's online service check that it the service can retrieve dummy/random

// feature table.

// Implement similarly for batch service.

try {

servingService.getFeastServingInfo(GetFeastServingInfoRequest.getDefaultInstance());

responseObserver.onNext(

HealthCheckResponse.newBuilder().setStatus(ServingStatus.SERVING).build());

} catch (Exception e) {

responseObserver.onNext(

HealthCheckResponse.newBuilder().setStatus(ServingStatus.NOT_SERVING).build());

}

responseObserver.onCompleted();

}

}