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✨ Backport support for metadata-only watches to release-0.6 #1248

Merged
merged 2 commits into from
Nov 9, 2020
Merged

✨ Backport support for metadata-only watches to release-0.6 #1248

merged 2 commits into from
Nov 9, 2020

Commits on Nov 5, 2020

  1. Support metadata-only watches 

    Add support for metadata-only watches. This backports a series of
commits from the main branch:

Add low-level metadata-only informer support

This adds support for informers that communicate with the API server in
metadata-only form.  They are *completely* separate from normal
informers -- that is: just like unstructured, if you ask for both a
"normal" informer & a metadata-only informer, you'll get two copies of
the cache.

Support metadata-only client operations

This adds support for a metadata-only client.  It only implements
the operations supported by metadata (delete, deleteallof, patch,
get, list, status.patch).  The higher-level client will now delegate
to this for when a PartialObjectMetadata object is passed in.

Support "projections" in the controller builder

This adds options to "project" watches as only metadata to the builder,
making it more convienient to use these forms.  For instance:

```go
.Owns(&corev1.Pod{}, builder.OnlyMetadata)
```

is equivalent to

```go
.Owns(&metav1.PartialObjectMetadata{
        TypeMeta: metav1.TypeMeta{
                APIVersion: "v1",
                Kind: "Pod",
        },
})
```

Co-authored-by: Solly Ross <sollyross@google.com>
    @ncdc @DirectXMan12
    ncdc and DirectXMan12 committed Nov 5, 2020
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  2. ✨ Allow to use builder.OnlyMetadata option with Watches 

    This change allows builders to use builder.OnlyMetadata when creating
extra watches with .Watches(...). The code inspects the passed
source.Source, and if it's of type *source.Kind, it calls the internal
project method that allows to use metav1.PartialObjectMetadata in
mapping functions.

Signed-off-by: Vince Prignano <vincepri@vmware.com>
(cherry picked from commit df54dc5)
    @vincepri @ncdc
    vincepri authored and ncdc committed Nov 5, 2020
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