gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/tools/gvisor_k8s_tool/cluster/cluster.go (about)

     1  // Copyright 2023 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // Package cluster provides functions for dealing with Kubernetes clusters.
    16  package cluster
    17  
    18  import (
    19  	"context"
    20  	"fmt"
    21  
    22  	appsv1 "k8s.io/api/apps/v1"
    23  	"k8s.io/apimachinery/pkg/apis/meta/v1"
    24  	"k8s.io/apimachinery/pkg/fields"
    25  	"k8s.io/client-go/kubernetes"
    26  	"k8s.io/client-go/rest"
    27  )
    28  
    29  const (
    30  	// NamespaceDefault is the name of the default Kubernetes namespace.
    31  	NamespaceDefault = "default"
    32  )
    33  
    34  // Cluster presents Kubernetes API method over a Kubernetes cluster.
    35  type Cluster struct {
    36  	client kubernetes.Interface
    37  }
    38  
    39  // New initializes a new Cluster from the given client REST config.
    40  func New(config *rest.Config) (*Cluster, error) {
    41  	clientSet, err := kubernetes.NewForConfig(config)
    42  	if err != nil {
    43  		return nil, fmt.Errorf("kubernetes.NewForConfig: %w", err)
    44  	}
    45  	return &Cluster{clientSet}, nil
    46  }
    47  
    48  // CreateDaemonset creates a daemonset with default options.
    49  func (c *Cluster) CreateDaemonset(ctx context.Context, ds *appsv1.DaemonSet) (*appsv1.DaemonSet, error) {
    50  	if ds.GetObjectMeta().GetNamespace() == "" {
    51  		ds.SetNamespace(NamespaceDefault)
    52  	}
    53  	return c.client.AppsV1().DaemonSets(ds.GetNamespace()).Create(ctx, ds, v1.CreateOptions{})
    54  }
    55  
    56  // DeleteDaemonset deletes a daemonset from this cluster.
    57  func (c *Cluster) DeleteDaemonset(ctx context.Context, ds *appsv1.DaemonSet) error {
    58  	return c.client.AppsV1().DaemonSets(ds.GetNamespace()).Delete(ctx, ds.GetName(), v1.DeleteOptions{})
    59  }
    60  
    61  // WaitForDaemonset waits until a daemonset has propagated containers across the affected nodes.
    62  func (c *Cluster) WaitForDaemonset(ctx context.Context, ds *appsv1.DaemonSet) error {
    63  	w, err := c.client.AppsV1().DaemonSets(ds.GetNamespace()).Watch(ctx, v1.ListOptions{
    64  		FieldSelector: fields.SelectorFromSet(fields.Set{v1.ObjectNameField: ds.ObjectMeta.Name}).String(),
    65  	})
    66  
    67  	if err != nil {
    68  		return fmt.Errorf("failed to watch DaemonSet: %w", err)
    69  	}
    70  	defer w.Stop()
    71  	for {
    72  		select {
    73  		case <-ctx.Done():
    74  			return fmt.Errorf("context canceled before DaemonSet was healthy")
    75  		case e, ok := <-w.ResultChan():
    76  			d, ok := e.Object.(*appsv1.DaemonSet)
    77  			if !ok {
    78  				return fmt.Errorf("invalid object type: %T", d)
    79  			}
    80  			if d.Status.NumberReady == d.Status.DesiredNumberScheduled && d.Status.NumberUnavailable == 0 {
    81  				return nil
    82  			}
    83  		}
    84  	}
    85  }