constellation/bootstrapper/internal/kubernetes/k8sapi/kubectl/client/client.go
Otto Bittner a68ee817ff AB#2074: Choosable K8S Version (#277)
AB#2074: Add configurable k8s version

Configurable version flow:
* cli config holds/validates k8sVersion
* InitCluster receive a k8sVersion arg
* InitCluster creates CM "k8s-version"
* kubeadm's InitConfiguration receives k8sVersion
* joinservice spec mounts/reads k8s-version CM
* joinservice supplies k8sVersion via JoinTicketResponse
Other changes:
* Remove unused test code (FakeK8SClient)
* move VersionConfig map to /internal/versions
* installk8sComponents is now a function instead of a method
2022-07-18 12:28:02 +02:00

103 lines
3.1 KiB
Go

package client
import (
"bytes"
"context"
"fmt"
"github.com/edgelesssys/constellation/bootstrapper/internal/kubernetes/k8sapi/resources"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/cli-runtime/pkg/resource"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
)
const fieldManager = "constellation-bootstrapper"
// Client implements k8sapi.Client interface and talks to the Kubernetes API.
type Client struct {
clientset kubernetes.Interface
builder *resource.Builder
}
// New creates a new Client, talking to the real k8s API.
func New(config []byte) (*Client, error) {
clientConfig, err := clientcmd.RESTConfigFromKubeConfig(config)
if err != nil {
return nil, fmt.Errorf("creating k8s client config from kubeconfig: %w", err)
}
clientset, err := kubernetes.NewForConfig(clientConfig)
if err != nil {
return nil, fmt.Errorf("creating k8s client from kubeconfig: %w", err)
}
restClientGetter, err := newRESTClientGetter(config)
if err != nil {
return nil, fmt.Errorf("creating k8s RESTClientGetter from kubeconfig: %w", err)
}
builder := resource.NewBuilder(restClientGetter).Unstructured()
return &Client{clientset: clientset, builder: builder}, nil
}
// ApplyOneObject uses server-side apply to send unstructured JSON blobs to the server and let it handle the core logic.
func (c *Client) ApplyOneObject(info *resource.Info, forceConflicts bool) error {
// helper can be used to patch k8s resources using server-side-apply.
helper := resource.NewHelper(info.Client, info.Mapping).
WithFieldManager(fieldManager)
// server-side-apply uses unstructured JSON instead of strict typing on the client side.
data, err := runtime.Encode(unstructured.UnstructuredJSONScheme, info.Object)
if err != nil {
return fmt.Errorf("preparing resource for server-side apply: encoding of resource: %w", err)
}
options := metav1.PatchOptions{
Force: &forceConflicts,
}
obj, err := helper.Patch(
info.Namespace,
info.Name,
types.ApplyPatchType,
data,
&options,
)
if err != nil {
return fmt.Errorf("applying object %v using server-side apply: %w", info, err)
}
return info.Refresh(obj, true)
}
// GetObjects tries to marshal the resources into []*resource.Info using a resource.Builder.
func (c *Client) GetObjects(resources resources.Marshaler) ([]*resource.Info, error) {
// convert our resource struct into YAML
data, err := resources.Marshal()
if err != nil {
return nil, fmt.Errorf("converting resources to YAML: %w", err)
}
// read into resource.Info using builder
reader := bytes.NewReader(data)
result := c.builder.
ContinueOnError().
NamespaceParam("default").
DefaultNamespace().
Stream(reader, "yaml").
Flatten().
Do()
return result.Infos()
}
// CreateConfigMap creates the given ConfigMap.
func (c *Client) CreateConfigMap(ctx context.Context, configMap corev1.ConfigMap) error {
_, err := c.clientset.CoreV1().ConfigMaps(configMap.ObjectMeta.Namespace).Create(ctx, &configMap, metav1.CreateOptions{})
if err != nil {
return err
}
return nil
}