/*
 * Copyright (c) 2020 Baidu, Inc.
 *
 * 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.
 */

package server

import (
	"fmt"

	"github.com/baidu/easyfaas/pkg/server/healthz"
)

// AddHealthzChecks allows you to add a HealthzCheck.
func (s *GenericServer) AddHealthzChecks(checks ...healthz.HealthzChecker) error {
	s.healthzLock.Lock()
	defer s.healthzLock.Unlock()

	if s.healthzCreated {
		return fmt.Errorf("unable to add because the healthz endpoint has already been created")
	}

	s.healthzChecks = append(s.healthzChecks, checks...)
	return nil
}

// installHealthz creates the healthz endpoint for this server
func (s *GenericServer) installHealthz() {
	s.healthzLock.Lock()
	defer s.healthzLock.Unlock()
	s.healthzCreated = true

	healthz.InstallHandler(s.Handler.NonGoRestfulMux, s.healthzChecks...)
}
