**`krt`** is a very high level wrapper around Kubernetes informers, building on top of `kclient`.

See the [krt README](../../pkg/kube/krt/README.md) for more information.

*krt is currently experimental; please ask maintainers before utilizing it in new areas.*

## Writing Controllers

The `controllers` package offers a variety of helpers for writing controllers.

    for (boolean interruptibly : new boolean[] {true, false}) {
      assertEquals(0, Queues.drain(q, ImmutableList.of(), 1, 10, MILLISECONDS));

      Producer producer = new Producer(q, 1);
      // producing one, will ask for two
      Future<?> producerThread = threadPool.submit(producer);
      producer.beganProducing.await();

      // make sure we time out
      Stopwatch timer = Stopwatch.createStarted();

- For in-depth information about how to use Istio, visit [istio.io](https://istio.io)
- To ask questions and get assistance from our community, visit [Github Discussions](https://github.com/istio/istio/discussions)
- To learn how to participate in our overall community, visit [our community page](https://istio.io/about/community)

    ```Python hl_lines="2  6  10"
    {!> ../../../docs_src/security/tutorial006.py!}
    ```

When you try to open the URL for the first time (or click the "Execute" button in the docs) the browser will ask you for your username and password:

<img src="/img/tutorial/security/image12.png">

## Check the username

Here's a more complete example.

Use a dependency to check if the username and password are correct.

          currentTask = coordinatorTask
          taskRunner.condition.signalAll()
        }
      }

    // Let the coordinator process its interruption.
    runTasks()
  }

  /** Ask a single task to proceed. Used by the test thread only. */
  fun runNextTask() {
    taskRunner.assertThreadDoesntHoldLock()

    taskRunner.lock.withLock {
      val contextSwitchCountBefore = contextSwitchCount

// 2. Adding the pod's IPs to the hostnetns ipsets for node probe checks
// 3. Creating iptables rules inside the pod's netns
// 4. Notifying ztunnel via GRPC to create a proxy for the pod
//
// You may ask why we pass the pod IPs separately from the pod manifest itself (which contains the pod IPs as a field)
// - this is because during add specifically, if CNI plugins have not finished executing,

    for (boolean interruptibly : new boolean[] {true, false}) {
      assertEquals(0, Queues.drain(q, ImmutableList.of(), 1, 10, MILLISECONDS));

      Producer producer = new Producer(q, 1);
      // producing one, will ask for two
      Future<?> producerThread = threadPool.submit(producer);
      producer.beganProducing.await();

      // make sure we time out
      Stopwatch timer = Stopwatch.createStarted();

        this.repositorySystemSession = null;
    }

    /**
     * Adapt a {@link MavenExecutionRequest} to a {@link Settings} object for use in the Maven core.
     * We want to make sure that what is ask for in the execution request overrides what is in the settings.
     * The CLI feeds into an execution request so if a particular value is present in the execution request

			if err := checkFields(un); err != nil {
				return nil, err
			}
			// IstioOperator isn't part of pkg/config/schema/collections,
			// usual conversion not available.  Convert unstructured to string
			// and ask operator code to check.
			un.SetCreationTimestamp(metav1.Time{}) // UnmarshalIstioOperator chokes on these
			by := util.ToYAML(un)
			iop, err := operatoristio.UnmarshalIstioOperator(by, false)
			if err != nil {

it in new free programs; and that you are informed that you can do
these things.

  To protect your rights, we need to make restrictions that forbid
distributors to deny you these rights or to ask you to surrender these
rights.  These restrictions translate to certain responsibilities for
you if you distribute copies of the library or if you modify it.

  For example, if you distribute copies of the library, whether gratis