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generic.go
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generic.go
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// Copyright 2020 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package statusreaders
import (
"context"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
"sigs.k8s.io/cli-utils/pkg/kstatus/polling/engine"
"sigs.k8s.io/cli-utils/pkg/kstatus/polling/event"
"sigs.k8s.io/cli-utils/pkg/kstatus/status"
"sigs.k8s.io/cli-utils/pkg/object"
)
// StatusFunc returns the status of the given object. This func is passed into
// NewGenericStatusReader so that the returned StatusReader can be used for custom types.
// An example of a StatusFunc is status.Compute.
type StatusFunc func(u *unstructured.Unstructured) (*status.Result, error)
func NewGenericStatusReader(mapper meta.RESTMapper, statusFunc StatusFunc) engine.StatusReader {
return &baseStatusReader{
mapper: mapper,
resourceStatusReader: &genericStatusReader{
mapper: mapper,
statusFunc: statusFunc,
},
}
}
// genericStatusReader is a resourceTypeStatusReader that will be used for
// any resource that doesn't have a specific engine. It will just delegate
// computation of status to the status library.
// This should work pretty well for resources that doesn't have any
// generated resources and where status can be computed only based on the
// resource itself.
type genericStatusReader struct {
mapper meta.RESTMapper
statusFunc StatusFunc
}
var _ resourceTypeStatusReader = &genericStatusReader{}
func (g *genericStatusReader) Supports(schema.GroupKind) bool {
return true
}
func (g *genericStatusReader) ReadStatusForObject(_ context.Context, _ engine.ClusterReader, resource *unstructured.Unstructured) (*event.ResourceStatus, error) {
identifier := object.UnstructuredToObjMetadata(resource)
res, err := g.statusFunc(resource)
if err != nil {
return errResourceToResourceStatus(err, resource)
}
return &event.ResourceStatus{
Identifier: identifier,
Status: res.Status,
Resource: resource,
Message: res.Message,
}, nil
}