Hi :slightly_smiling_face: kind of new in Kotlin i...

# getting-started

[LIRAN Y]

Hi 🙂 kind of new in Kotlin i am using the https://github.com/fabric8io/kubernetes-client
and i trying to create a fun to wait until all pods are ready
so i first took all the names of the pods

private fun printAllPodsName() {
    val podList = client.pods().inNamespace("default").list()
    podList.items.forEach(Consumer { obj: Pod ->
        println(obj.metadata.name)
    })
}

now i want to go over this pod name list so it will check if the status is ready or not i tried to do something like this

fun waitUntilAllPodsAreReady() {
        for (podname in printAllPodsName().toString()) {
            client.pods().inNamespace("default").waitUntilCondition({ pods ->
                pods.status != null && pods.status.conditions != null
            }, 10, TimeUnit.MINUTES)
            println(podname.toString())
        }
    }

but it seems like not working
any idea will be blessed

[Roukanken]

The problem is your printAllPodsName function - as its name says, it is printing names of all pods, not returning them
So when you try to use the names of the pods, it does not compile, as you may have noticed by having to add .toString() in the for cycle: for (podname in printAllPodsName().toString()) {

Since your function does not have a return value, it implicitly returns Unit, of which .toString() is `kotlin.Unit`: so you are searching for pods named k, o, t, ... and so on

[Roukanken]

also no idea about the API of the client, but you never actually mention the podname variable while trying to wait on it

[LIRAN Y]

Great thank you @Roukanken
But how can i use a return? inside the forEach

regarding the podname i changed the func to this:

fun waitUntilAllPodsAreReady() {
    for (podname in printAllPodsName().toString()) {
        client.pods().inNamespace("default").withName("$podname").waitUntilReady(20, TimeUnit.SECONDS)
        Gauge.writeMessage("$podname is ready")
    }
}

[Roukanken]

What is type of podList.items ? It probably implements List<T> so you should be able to call .map { pod -> pod.metadata.name } on it - which will return you a list of pod names, and you can pass that onwards

[Nico Filzmoser]

Without any deeper knowledge of the API, you might want to have something like this?

fun getAllPodNames(): List<String> {
        val podList = client.pods().inNamespace("default").list()
        return podList.items.map { it.metadata.name }
    }

    fun waitUntilAllPodsAreReady() {
        getAllPodNames().forEach { podName ->
            client.pods().inNamespace("default").withName(podName).waitUntilCondition(
                { pod ->
                    pod.status != null && pod.status.conditions != null
                }, 10, TimeUnit.MINUTES
            )
        }
    }

[LIRAN Y]

Yes @Roukanken the .map saved me 10xxx
and @Nico Filzmoser yeap i did like you wrote
thanks you both 👍 i also succeeded to write other fun to print just the running pods

fun printAllTheRunningPods() {
client.pods().withField("status.phase", "Running").list().items.stream()
    .map { obj: Pod -> obj.metadata }.map { obj: ObjectMeta -> obj.name }
    .forEach { msg: String? -> println("$msg is running OK") }
}