app_health_check.go

package checks

import (
	"fmt"
	"time"
	"strings"

	maps "github.com/ashwanthkumar/golang-utils/maps"
	"github.com/gambol99/go-marathon"
)


// Checks App health status periodically (configurable -5m) 
// Get App Endpoint by reading router.hosts and Check for 200 status code
func Check(app marathon.Application) AppCheck {
    host := maps.GetString(app.Labels, "router.hosts", "notDefined")
    host_path := app.HealthChecks.path
    host_url = strings.Join("http://", host, host_path)
    result := Pass

	resp, err := http.Get(host_url)
	if err != nil {
		log.Fatal(err)
	}
	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Fatal(err)
	}

	responseString := string(body)

	fmt.Println(responseString)

	fmt.Println("HTTP Response Status: " + strconv.Itoa(resp.StatusCode))

	if resp.StatusCode >= 200 && resp.StatusCode <= 299 {
		result = Pass
		message = fmt.Println("HTTP Status OK!")
	} else {
		result = Critical
		message = fmt.Printf("Critical, brokem")
	}

	return AppCheck{
		App:       app.ID,
		Labels:    app.Labels,
		CheckName: n.Name(),
		Result:    result,
		Message:   message,
		Timestamp: time.Now(),
	}
}