Go install chart and check if app is up and running

Question

I've the following code which works,I was able to create a helm chart in the target cluster. when you install some chart until the application (within the chart) is available it takes time , How can I check if the application that installed via helm chart is up and running ? is there a way to do it with the helm client (we are using helm 3.5.2)

tmpfile, err := ioutil.TempFile(kp, kcp)
if err != nil {
    log.Error(err, "error")
}

defer os.Remove(tmpfile.Name()) 

if _, err := tmpfile.Write(cfg); err != nil {
    return err
}
if err := tmpfile.Close(); err != nil {
    return err
}

kcfgFilePath := tmpfile.Name()
settings := cli.New()
ac := new(action.Configuration)
clientGetter := genericclioptions.NewConfigFlags(false)
clientGetter.KubeConfig = &kcfgFilePath



for _, chartInstallation := range charts {
    chart, err := loader.Load(chartInstallation.Path)
    if err != nil {
        return err
    }

    releaseName := releaseName + "-" + chartInstallation.Name
    if err := ac.Init(clientGetter, settings.Namespace(), os.Getenv("HELM_DRIVER"), func(format string, v ...interface{}) {
        
    }); err != nil {
        return err
    }
    releasePresent := true
    statusAction := action.NewStatus(ac)
    status, err := statusAction.Run(releaseName)
    if err != nil {
        if strings.Contains(err.Error(), driver.ErrReleaseNotFound.Error()) {
            releasePresent = false
        } else {
            return err
        }
    }

    if !releasePresent {
        // install chart
        installAction := action.NewInstall(ac)
        installAction.CreateNamespace = true
        installAction.Namespace = chartInstallation.Namespace
        installAction.ReleaseName = releaseName

        _, err := installAction.Run(chart, nil)
        if err != nil {
            return err
        }
        log.Info(“chart installed: ", "releaseName", releaseName)
    }

    if status != nil {
        if releasePresent && status.Info.Status.String() == release.StatusFailed.String() { 
            upgradeAction := action.NewUpgrade(ac)
            upgradeAction.Wait = true
            upgradeAction.ReuseValues = false
            upgradeAction.Recreate = false
            _, err := upgradeAction.Run(releaseName, chart, nil)
            if err != nil {
                return err
            }
        }
    }

Answer 1

You need to helm install (or upgrade) using the --wait flag:

--wait: Waits until all Pods are in a ready state, PVCs are bound, Deployments have minimum (Desired minus maxUnavailable) Pods in ready state and Services have an IP address (and Ingress if a LoadBalancer) before marking the release as successful. It will wait for as long as the --timeout [...]

Make sure that your pods have Liveness and Readiness checks. Using the --wait the release will only return successfully after these checks are passing.