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client.go
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client.go
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package awsiamauth
import (
"context"
"encoding/base64"
"fmt"
"time"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
"github.com/aws/eks-anywhere/pkg/constants"
"github.com/aws/eks-anywhere/pkg/retrier"
"github.com/aws/eks-anywhere/pkg/types"
)
// Client is a Kubernetes client.
type Client interface {
ApplyKubeSpecFromBytes(ctx context.Context, cluster *types.Cluster, data []byte) error
GetApiServerUrl(ctx context.Context, cluster *types.Cluster) (string, error)
GetObject(ctx context.Context, resourceType string, name string, namespace string, kubeconfig string, obj runtime.Object) error
}
// RetrierClient wraps basic kubernetes API operations around a retrier.
type RetrierClient struct {
client Client
retrier retrier.Retrier
}
// RetrierClientOpt allows to customize a RetrierClient
// on construction.
type RetrierClientOpt func(*RetrierClient)
// RetrierClientRetrier allows to use a custom retrier.
func RetrierClientRetrier(retrier retrier.Retrier) RetrierClientOpt {
return func(u *RetrierClient) {
u.retrier = retrier
}
}
// NewRetrierClient constructs a new RetrierClient.
func NewRetrierClient(client Client, opts ...RetrierClientOpt) RetrierClient {
c := &RetrierClient{
client: client,
retrier: *retrier.NewWithMaxRetries(10, time.Second),
}
for _, opt := range opts {
opt(c)
}
return *c
}
// Apply creates/updates the data objects for a cluster.
func (c RetrierClient) Apply(ctx context.Context, cluster *types.Cluster, data []byte) error {
return c.retrier.Retry(
func() error {
return c.client.ApplyKubeSpecFromBytes(ctx, cluster, data)
},
)
}
// GetAPIServerURL gets the api server url from K8s config.
func (c RetrierClient) GetAPIServerURL(ctx context.Context, cluster *types.Cluster) (string, error) {
var url string
err := c.retrier.Retry(
func() error {
var err error
url, err = c.client.GetApiServerUrl(ctx, cluster)
return err
},
)
if err != nil {
return "", err
}
return url, nil
}
// GetClusterCACert gets the ca cert for a cluster from a secret.
func (c RetrierClient) GetClusterCACert(ctx context.Context, cluster *types.Cluster, clusterName string) ([]byte, error) {
secret := &corev1.Secret{}
secretName := fmt.Sprintf("%s-ca", clusterName)
err := c.retrier.Retry(
func() error {
return c.client.GetObject(ctx, "secret", secretName, constants.EksaSystemNamespace, cluster.KubeconfigFile, secret)
},
)
if err != nil {
return nil, err
}
if crt, ok := secret.Data["tls.crt"]; ok {
b64EncodedCrt := make([]byte, base64.StdEncoding.EncodedLen(len(crt)))
base64.StdEncoding.Encode(b64EncodedCrt, crt)
return b64EncodedCrt, nil
}
return nil, fmt.Errorf("tls.crt not found in secret [%s]", secretName)
}