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package resources
import (
"context"
"io"
"math/rand"
"time"
"github.com/docker/go-p9p"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/labels"
corev1 "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
)
type NamespacesRef struct {
client kubernetes.Interface
namespaceInformer corev1.NamespaceInformer
session Session
info *p9p.Dir
readdir *p9p.Readdir
}
func NewNamespacesRef(client kubernetes.Interface, session Session) *NamespacesRef {
namespaceInformer := session.Informer().Core().V1().Namespaces()
return &NamespacesRef{
client: client,
namespaceInformer: namespaceInformer,
session: session,
}
}
func (r *NamespacesRef) Info() p9p.Dir {
if r.info != nil {
return *r.info
}
dir := p9p.Dir{}
dir.Qid.Path = rand.Uint64()
dir.Qid.Version = 0
dir.Name = "namespaces"
dir.Mode = 0664
dir.Length = 0
dir.AccessTime = time.Now()
dir.ModTime = time.Now()
dir.MUID = "none"
uname, _ := r.session.GetAuth()
dir.UID = uname
dir.GID = uname
dir.Qid.Type |= p9p.QTDIR
dir.Mode |= p9p.DMDIR
r.info = &dir
return dir
}
func (r *NamespacesRef) Get(name string) (Ref, error) {
namespace, err := r.namespaceInformer.Lister().Get(name)
if apierrors.IsNotFound(err) {
return nil, p9p.ErrNotfound
}
if err != nil {
return nil, err
}
return &NamespaceRef{
namespace: namespace,
client: r.client,
session: r.session,
}, nil
}
func (r *NamespacesRef) Read(ctx context.Context, p []byte, offset int64) (n int, err error) {
if r.readdir != nil {
return r.readdir.Read(ctx, p, offset)
}
namespaces, err := r.namespaceInformer.Lister().List(labels.Everything())
if err != nil {
return 0, err
}
namespaceRefs := make([]NamespaceRef, 0, len(namespaces))
for _, namespace := range namespaces {
namespace := namespace
namespaceRefs = append(namespaceRefs, NamespaceRef{
namespace: namespace,
client: r.client,
session: r.session,
})
}
r.readdir = p9p.NewReaddir(p9p.NewCodec(), func() (p9p.Dir, error) {
if len(namespaceRefs) == 0 {
return p9p.Dir{}, io.EOF
}
ns := namespaceRefs[0]
namespaceRefs = namespaceRefs[1:]
return ns.Info(), nil
})
return r.readdir.Read(ctx, p, offset)
}
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