/
provider.go
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/
provider.go
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// Copyright 2018 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package provider
import (
stdcontext "context"
"net/url"
osexec "os/exec"
jujuclock "github.com/juju/clock"
"github.com/juju/errors"
"github.com/juju/jsonschema"
"github.com/juju/utils/v3/exec"
corev1 "k8s.io/api/core/v1"
storagev1 "k8s.io/api/storage/v1"
apiextensionsclientset "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
k8slabels "k8s.io/apimachinery/pkg/labels"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"github.com/juju/juju/caas"
k8s "github.com/juju/juju/caas/kubernetes"
k8scloud "github.com/juju/juju/caas/kubernetes/cloud"
"github.com/juju/juju/caas/kubernetes/provider/constants"
"github.com/juju/juju/caas/kubernetes/provider/utils"
k8swatcher "github.com/juju/juju/caas/kubernetes/provider/watcher"
"github.com/juju/juju/cloud"
"github.com/juju/juju/environs"
environsbootstrap "github.com/juju/juju/environs/bootstrap"
environscloudspec "github.com/juju/juju/environs/cloudspec"
"github.com/juju/juju/environs/config"
"github.com/juju/juju/environs/context"
)
// ClusterMetadataStorageChecker provides functionalities for checking k8s cluster storage and pods details.
type ClusterMetadataStorageChecker interface {
k8s.ClusterMetadataChecker
ListStorageClasses(selector k8slabels.Selector) ([]storagev1.StorageClass, error)
ListPods(namespace string, selector k8slabels.Selector) ([]corev1.Pod, error)
}
type kubernetesEnvironProvider struct {
environProviderCredentials
cmdRunner CommandRunner
builtinCloudGetter func(CommandRunner) (cloud.Cloud, error)
brokerGetter func(environs.OpenParams) (ClusterMetadataStorageChecker, error)
}
var _ environs.EnvironProvider = (*kubernetesEnvironProvider)(nil)
var providerInstance = kubernetesEnvironProvider{
environProviderCredentials: environProviderCredentials{
cmdRunner: defaultRunner{},
builtinCredentialGetter: func(cmdRunner CommandRunner) (cloud.Credential, error) {
return attemptMicroK8sCredential(cmdRunner, decideKubeConfigDir)
},
},
cmdRunner: defaultRunner{},
builtinCloudGetter: func(cmdRunner CommandRunner) (cloud.Cloud, error) {
return attemptMicroK8sCloud(cmdRunner, decideKubeConfigDir)
},
brokerGetter: func(args environs.OpenParams) (ClusterMetadataStorageChecker, error) {
broker, err := caas.New(stdcontext.TODO(), args)
if err != nil {
return nil, errors.Trace(err)
}
metaChecker, supported := broker.(ClusterMetadataStorageChecker)
if !supported {
return nil, errors.NotSupportedf("cluster metadata ")
}
return metaChecker, nil
},
}
// Version is part of the EnvironProvider interface.
func (kubernetesEnvironProvider) Version() int {
return 0
}
// CommandRunner allows to run commands on the underlying system
type CommandRunner interface {
RunCommands(run exec.RunParams) (*exec.ExecResponse, error)
LookPath(string) (string, error)
}
type defaultRunner struct{}
func (defaultRunner) RunCommands(run exec.RunParams) (*exec.ExecResponse, error) {
return exec.RunCommands(run)
}
func (defaultRunner) LookPath(file string) (string, error) {
return osexec.LookPath(file)
}
// NewK8sClients returns the k8s clients to access a cluster.
// Override for testing.
var NewK8sClients = func(c *rest.Config) (
k8sClient kubernetes.Interface,
apiextensionsclient apiextensionsclientset.Interface,
dynamicClient dynamic.Interface,
err error,
) {
k8sClient, err = kubernetes.NewForConfig(c)
if err != nil {
return nil, nil, nil, err
}
apiextensionsclient, err = apiextensionsclientset.NewForConfig(c)
if err != nil {
return nil, nil, nil, err
}
dynamicClient, err = dynamic.NewForConfig(c)
if err != nil {
return nil, nil, nil, err
}
return k8sClient, apiextensionsclient, dynamicClient, nil
}
// CloudSpecToK8sRestConfig translates cloudspec to k8s rest config.
func CloudSpecToK8sRestConfig(cloudSpec environscloudspec.CloudSpec) (*rest.Config, error) {
if cloudSpec.IsControllerCloud {
rc, err := rest.InClusterConfig()
if err != nil && err != rest.ErrNotInCluster {
return nil, errors.Trace(err)
}
if rc != nil {
logger.Tracef("using in-cluster config")
return rc, nil
}
}
if cloudSpec.Credential == nil {
return nil, errors.Errorf("cloud %v has no credential", cloudSpec.Name)
}
var CAData []byte
for _, cacert := range cloudSpec.CACertificates {
CAData = append(CAData, cacert...)
}
credentialAttrs := cloudSpec.Credential.Attributes()
return &rest.Config{
Host: cloudSpec.Endpoint,
Username: credentialAttrs[k8scloud.CredAttrUsername],
Password: credentialAttrs[k8scloud.CredAttrPassword],
BearerToken: credentialAttrs[k8scloud.CredAttrToken],
TLSClientConfig: rest.TLSClientConfig{
CertData: []byte(credentialAttrs[k8scloud.CredAttrClientCertificateData]),
KeyData: []byte(credentialAttrs[k8scloud.CredAttrClientKeyData]),
CAData: CAData,
Insecure: cloudSpec.SkipTLSVerify,
},
}, nil
}
func newRestClient(cfg *rest.Config) (rest.Interface, error) {
return rest.RESTClientFor(cfg)
}
// Open is part of the ContainerEnvironProvider interface.
func (p kubernetesEnvironProvider) Open(args environs.OpenParams) (caas.Broker, error) {
logger.Debugf("opening model %q.", args.Config.Name())
if err := p.validateCloudSpec(args.Cloud); err != nil {
return nil, errors.Annotate(err, "validating cloud spec")
}
k8sRestConfig, err := CloudSpecToK8sRestConfig(args.Cloud)
if err != nil {
return nil, errors.Trace(err)
}
if args.Config.Name() != environsbootstrap.ControllerModelName {
broker, err := newK8sBroker(
args.ControllerUUID, k8sRestConfig, args.Config, args.Config.Name(), NewK8sClients, newRestClient,
k8swatcher.NewKubernetesNotifyWatcher, k8swatcher.NewKubernetesStringsWatcher, utils.RandomPrefix,
jujuclock.WallClock)
if err != nil {
return nil, errors.Trace(err)
}
return broker, nil
}
k8sClient, _, _, err := NewK8sClients(k8sRestConfig)
if err != nil {
return nil, errors.Trace(err)
}
ns, err := findControllerNamespace(k8sClient, args.ControllerUUID)
if errors.IsNotFound(err) {
// The controller is currently bootstrapping.
return newK8sBroker(
args.ControllerUUID, k8sRestConfig, args.Config, "",
NewK8sClients, newRestClient, k8swatcher.NewKubernetesNotifyWatcher, k8swatcher.NewKubernetesStringsWatcher,
utils.RandomPrefix, jujuclock.WallClock)
} else if err != nil {
return nil, err
}
return newK8sBroker(
args.ControllerUUID, k8sRestConfig, args.Config, ns.Name,
NewK8sClients, newRestClient, k8swatcher.NewKubernetesNotifyWatcher, k8swatcher.NewKubernetesStringsWatcher,
utils.RandomPrefix, jujuclock.WallClock)
}
// CloudSchema returns the schema for adding new clouds of this type.
func (p kubernetesEnvironProvider) CloudSchema() *jsonschema.Schema {
return nil
}
// Ping tests the connection to the cloud, to verify the endpoint is valid.
func (p kubernetesEnvironProvider) Ping(ctx context.ProviderCallContext, endpoint string) error {
return errors.NotImplementedf("Ping")
}
// PrepareConfig is specified in the EnvironProvider interface.
func (p kubernetesEnvironProvider) PrepareConfig(args environs.PrepareConfigParams) (*config.Config, error) {
if err := p.validateCloudSpec(args.Cloud); err != nil {
return nil, errors.Annotate(err, "validating cloud spec")
}
// Set the default storage sources.
attrs := make(map[string]interface{})
if _, ok := args.Config.StorageDefaultBlockSource(); !ok {
attrs[config.StorageDefaultBlockSourceKey] = constants.StorageProviderType
}
if _, ok := args.Config.StorageDefaultFilesystemSource(); !ok {
attrs[config.StorageDefaultFilesystemSourceKey] = constants.StorageProviderType
}
return args.Config.Apply(attrs)
}
// DetectRegions is specified in the environs.CloudRegionDetector interface.
func (p kubernetesEnvironProvider) DetectRegions() ([]cloud.Region, error) {
return nil, errors.NotFoundf("regions")
}
func (p kubernetesEnvironProvider) validateCloudSpec(spec environscloudspec.CloudSpec) error {
if err := spec.Validate(); err != nil {
return errors.Trace(err)
}
if _, err := url.Parse(spec.Endpoint); err != nil {
return errors.NotValidf("endpoint %q", spec.Endpoint)
}
if spec.Credential == nil {
return errors.NotValidf("missing credential")
}
if authType := spec.Credential.AuthType(); !k8scloud.SupportedAuthTypes().Contains(authType) {
return errors.NotSupportedf("%q auth-type", authType)
}
return nil
}