InVisionApp/go-health

package main

import (
    "log"
    "net/http"
    "net/url"
    "time"

    "github.com/InVisionApp/go-health/v2"
    "github.com/InVisionApp/go-health/v2/checkers"
    "github.com/InVisionApp/go-health/v2/handlers"
)

func main() {
    // Create a new health instance
    h := health.New()
    goodTestURL, _ := url.Parse("https://google.com")
    badTestURL, _ := url.Parse("google.com")

    // Create a couple of checks
    goodHTTPCheck, _ := checkers.NewHTTP(&checkers.HTTPConfig{
        URL: goodTestURL,
    })

    badHTTPCheck, _ := checkers.NewHTTP(&checkers.HTTPConfig{
        URL: badTestURL,
    })

    // Add the checks to the health instance
    h.AddChecks([]*health.Config{
        {
            Name:     "good-check",
            Checker:  goodHTTPCheck,
            Interval: time.Duration(2) * time.Second,
            Fatal:    true,
        },
        {
            Name:     "bad-check",
            Checker:  badHTTPCheck,
            Interval: time.Duration(2) * time.Second,
            Fatal:    false,
        },
    })

    //  Start the healthcheck process
    if err := h.Start(); err != nil {
        log.Fatalf("Unable to start healthcheck: %v", err)
    }

    log.Println("Server listening on :8080")

    // Define a healthcheck endpoint and use the built-in JSON handler
    http.HandleFunc("/healthcheck", handlers.NewJSONHandlerFunc(h, nil))
    http.ListenAndServe(":8080", nil)
}