# Controllers

Istio has a variety of [controllers](https://kubernetes.io/docs/concepts/architecture/controller/), which basically watch some inputs and do something.
This can be reading from Kubernetes and writing other objects back, writing to proxies over XDS, etc.

Unfortunately, writing controllers is very error prone, even for seemingly simple cases.
To work around this, Istio has a variety of abstractions meant to make writing controllers easier.

## Clients

  - author: Jeny Sadadia
    author_link: https://github.com/JenySadadia
    link: https://www.youtube.com/watch?v=uZdTe8_Z6BQ
    title: 'PyCon AU 2023: Testing asynchronous applications with FastAPI and pytest'
  - author: Sebastián Ramírez (tiangolo)
    author_link: https://twitter.com/tiangolo
    link: https://www.youtube.com/watch?v=PnpTY1f4k2U
    title: '[VIRTUAL] Py.Amsterdam''s flying Software Circus: Intro to FastAPI'

    /**
     * Creates a directory watch
     * 
     * The server will notify the client when there are changes to the directories contents
     * 
     * @param filter
     *            see constants in {@link FileNotifyInformation}
     * @param recursive
     *            whether to also watch subdirectories
     * @return watch context, needs to be closed when finished
     * @throws CIFSException

  // ClusterTrustBundle object names include `example.com:foo:abc` and
  // `example.com:foo:v1`.
  //
  // If signerName is empty, then the ClusterTrustBundle object's name must
  // not have such a prefix.
  //
  // List/watch requests for ClusterTrustBundles can filter on this field
  // using a `spec.signerName=NAME` field selector.
  //
  // +optional
  optional string signerName = 1;

             absl::Span<AbstractTensorHandle* const> inputs,
             absl::Span<AbstractTensorHandle*> outputs) -> Status {
    Tape tape(/*persistent=*/false);
    for (size_t i{}; i < inputs.size(); ++i) {
      tape.Watch(inputs[i]);
    }
    std::vector<AbstractTensorHandle*> temp_outputs(1);
    AbstractContextPtr tape_ctx(new TapeContext(ctx, &tape, grad_registry));
    TF_RETURN_IF_ERROR(

- Kube-apiserver: Fixed a `1.27`+ regression in watch stability by serving watch requests without a `resourceVersion` from the watch cache by default, as in <`1.27` (disabling the change in PR 115096 by default). This mitigates the impact of an etcd watch bug (https://github.com/etcd-io/etcd/pull/17555). If the 1.27 change in PR 115096 to serve these requests from underlying storage is still desired despite the impact on watch stability, it can be re-enabled with a `WatchFromStorageWi...

  // "" (empty) means "all" for namespace scoped resources from a SubjectAccessReview or SelfSubjectAccessReview
  // +optional
  optional string namespace = 1;

  // Verb is a kubernetes resource API verb, like: get, list, watch, create, update, delete, proxy.  "*" means all.
  // +optional
  optional string verb = 2;

  // Group is the API Group of the Resource.  "*" means all.
  // +optional
  optional string group = 3;

Чем больше звёзд, тем легче другим пользователям найти нас и увидеть, что проект уже стал полезным для многих.

## Отслеживать свежие выпуски в репозитории на GitHub

Вы можете "отслеживать" FastAPI на GitHub (кликните по кнопке "watch" наверху справа): <a href="https://github.com/tiangolo/fastapi" class="external-link" target="_blank">https://github.com/tiangolo/fastapi</a>. 👀

Там же Вы можете указать в настройках - "Releases only".

      description: |
        After submitting this, I commit to one of:

          * Read open questions until I find 2 where I can help someone and add a comment to help there.
          * I already hit the "watch" button in this repository to receive notifications and I commit to help at least 2 people that ask questions in the future.

## Privileges required