goma-gateway/internal/healthCheck.go

package pkg

/*
Copyright 2024 Jonas Kaninda

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.
*/
import (
	"fmt"
	"github.com/jkaninda/goma-gateway/pkg/logger"
	"io"
	"net/http"
	"net/url"
	"slices"
)

func healthCheck(healthURL string, healthyStatuses []int) error {
	healthCheckURL, err := url.Parse(healthURL)
	if err != nil {
		return fmt.Errorf("error parsing HealthCheck URL: %v ", err)
	}
	// Create a new request for the route
	healthReq, err := http.NewRequest("GET", healthCheckURL.String(), nil)
	if err != nil {
		return fmt.Errorf("error creating HealthCheck request: %v ", err)
	}
	// Perform the request to the route's healthcheck
	client := &http.Client{}
	healthResp, err := client.Do(healthReq)
	if err != nil {
		logger.Error("Error performing HealthCheck request: %v ", err)
		return fmt.Errorf("error performing HealthCheck request: %v ", err)
	}
	defer func(Body io.ReadCloser) {
		err := Body.Close()
		if err != nil {
		}
	}(healthResp.Body)
	if len(healthyStatuses) > 0 {
		if !slices.Contains(healthyStatuses, healthResp.StatusCode) {
			logger.Error("Error performing HealthCheck request: %v ", err)
			return fmt.Errorf("health check failed with status code %v", healthResp.StatusCode)
		}
	} else {
		if healthResp.StatusCode >= 400 {
			logger.Debug("Error performing HealthCheck request: %v ", err)
			return fmt.Errorf("health check failed with status code %v", healthResp.StatusCode)
		}
	}
	return nil
}