mirror of
https://github.com/imjasonh/client-go2
synced 2026-07-13 03:18:27 +00:00
78 lines
2.5 KiB
Go
78 lines
2.5 KiB
Go
package generic
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import (
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"bytes"
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"context"
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"encoding/json"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/client-go/dynamic"
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"k8s.io/client-go/rest"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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)
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// Ideally, this wouldn't need to take a GVR, and it could just be inferred
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// from the runtime.Object type given.
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//
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// In practice, this doesn't seem to be straightforward. :(
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//
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// Things that implement runtime.Object tend to be pointer types (e.g.,
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// *corev1.Pod), which means T is nil, and we can't call GetObjectKind() on it
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// to start to guess at the GVR.
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//
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// It might be possible to use schemes to lookup the GVR for a given Go type
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// (assuming it's been registered), which could let us get rid of this.
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// In the meantime, taking a GVR removes ambiguity at the cost of verbosity.
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// /shrug
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func NewClient[T runtime.Object](gvr schema.GroupVersionResource, config *rest.Config) client[T] {
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return client[T] {
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gvr: gvr,
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dyn: dynamic.NewForConfigOrDie(config),
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}
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}
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type client[T runtime.Object] struct {
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gvr schema.GroupVersionResource
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dyn dynamic.Interface // TODO: don't depend on dynamic client
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}
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func (c client[T]) List(ctx context.Context, namespace string) ([]T, error) {
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ul, err := c.dyn.Resource(c.gvr).Namespace(namespace).List(ctx, metav1.ListOptions{})
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if err != nil {
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return nil, err
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}
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var out []T
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for _, u := range ul.Items {
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var t T
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var buf bytes.Buffer
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if err := json.NewEncoder(&buf).Encode(u.Object); err != nil { return nil, err }
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if err := json.NewDecoder(&buf).Decode(&t); err != nil { return nil, err }
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out = append(out, t)
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}
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return out, nil
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}
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func (c client[T]) Get(ctx context.Context, namespace, name string) (T, error) {
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var t T
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u, err := c.dyn.Resource(c.gvr).Namespace(namespace).Get(ctx, name, metav1.GetOptions{})
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if err != nil {
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return t, err
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}
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var buf bytes.Buffer
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if err := json.NewEncoder(&buf).Encode(u.Object); err != nil { return t, err }
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if err := json.NewDecoder(&buf).Decode(&t); err != nil { return t, err }
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return t, nil
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}
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func (c client[T]) Create(ctx context.Context, namespace string, t T) error {
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m := map[string]interface{}{}
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var buf bytes.Buffer
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if err := json.NewEncoder(&buf).Encode(t); err != nil { return err }
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if err := json.NewDecoder(&buf).Decode(&m); err != nil { return err }
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u := &unstructured.Unstructured{Object:m}
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_, err := c.dyn.Resource(c.gvr).Namespace(namespace).Create(ctx, u, metav1.CreateOptions{})
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return err
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}
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