✨ Backport support for metadata-only watches to release-0.6 #1248
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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>
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)
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: alvaroaleman, ncdc, vincepri The full list of commands accepted by this bot can be found here. The pull request process is described here
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Add support for metadata-only watches to release-0.6. Note, this was a manual backport, as there were several conflicts when trying to cherry-pick. All the tests should be passing, but I encourage reviewers to 👀 carefully. Thanks!
From the original PRs:
#1174:
This introduces metadata-only support (PartialObjectMetadata) to the client, cache, and controller builder. It works much like unstructured does, with an end-use of:
Note that like unstructured, the caches are completely separate -- asking for an unstructured object or concrete object will end up constructing a separate cache.
#1242:
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.
Fixes #1236