alexlebens/external-snapshotter
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Add Snapshot Controller

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This PR adds external snapshot controller and main package under cmd.
This commit is contained in:
xing-yang
2018-07-12 11:00:55 -07:00
committed by Xing Yang
parent cc19fd383f
commit 2663b1351f
7 changed files with 2003 additions and 2 deletions
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139
cmd/csi-snapshotter/create_crd.go Normal file
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@@ -0,0 +1,139 @@
/*
Copyright 2018 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"reflect"
"time"
"github.com/golang/glog"
crdv1 "github.com/kubernetes-csi/external-snapshotter/pkg/apis/volumesnapshot/v1alpha1"
apiextensionsv1beta1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
apiextensionsclient "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/rest"
)
const (
// SnapshotPVCAnnotation is "snapshot.alpha.kubernetes.io/snapshot"
SnapshotPVCAnnotation = "volumesnapshot.csi.k8s.io/snapshot"
)
// NewClient creates a new RESTClient
func NewClient(cfg *rest.Config) (*rest.RESTClient, *runtime.Scheme, error) {
scheme := runtime.NewScheme()
if err := crdv1.AddToScheme(scheme); err != nil {
return nil, nil, err
}
config := *cfg
config.GroupVersion = &crdv1.SchemeGroupVersion
config.APIPath = "/apis"
config.ContentType = runtime.ContentTypeJSON
config.NegotiatedSerializer = serializer.DirectCodecFactory{CodecFactory: serializer.NewCodecFactory(scheme)}
client, err := rest.RESTClientFor(&config)
if err != nil {
return nil, nil, err
}
return client, scheme, nil
}
// CreateCRD creates CustomResourceDefinition
func CreateCRD(clientset apiextensionsclient.Interface) error {
crd := &apiextensionsv1beta1.CustomResourceDefinition{
ObjectMeta: metav1.ObjectMeta{
Name: crdv1.VolumeSnapshotClassResourcePlural + "." + crdv1.GroupName,
},
Spec: apiextensionsv1beta1.CustomResourceDefinitionSpec{
Group: crdv1.GroupName,
Version: crdv1.SchemeGroupVersion.Version,
Scope: apiextensionsv1beta1.ClusterScoped,
Names: apiextensionsv1beta1.CustomResourceDefinitionNames{
Plural: crdv1.VolumeSnapshotClassResourcePlural,
Kind: reflect.TypeOf(crdv1.VolumeSnapshotClass{}).Name(),
},
},
}
res, err := clientset.ApiextensionsV1beta1().CustomResourceDefinitions().Create(crd)
if err != nil && !apierrors.IsAlreadyExists(err) {
glog.Fatalf("failed to create VolumeSnapshotResource: %#v, err: %#v",
res, err)
}
crd = &apiextensionsv1beta1.CustomResourceDefinition{
ObjectMeta: metav1.ObjectMeta{
Name: crdv1.VolumeSnapshotContentResourcePlural + "." + crdv1.GroupName,
},
Spec: apiextensionsv1beta1.CustomResourceDefinitionSpec{
Group: crdv1.GroupName,
Version: crdv1.SchemeGroupVersion.Version,
Scope: apiextensionsv1beta1.ClusterScoped,
Names: apiextensionsv1beta1.CustomResourceDefinitionNames{
Plural: crdv1.VolumeSnapshotContentResourcePlural,
Kind: reflect.TypeOf(crdv1.VolumeSnapshotContent{}).Name(),
},
},
}
res, err = clientset.ApiextensionsV1beta1().CustomResourceDefinitions().Create(crd)
if err != nil && !apierrors.IsAlreadyExists(err) {
glog.Fatalf("failed to create VolumeSnapshotContentResource: %#v, err: %#v",
res, err)
}
crd = &apiextensionsv1beta1.CustomResourceDefinition{
ObjectMeta: metav1.ObjectMeta{
Name: crdv1.VolumeSnapshotResourcePlural + "." + crdv1.GroupName,
},
Spec: apiextensionsv1beta1.CustomResourceDefinitionSpec{
Group: crdv1.GroupName,
Version: crdv1.SchemeGroupVersion.Version,
Scope: apiextensionsv1beta1.NamespaceScoped,
Names: apiextensionsv1beta1.CustomResourceDefinitionNames{
Plural: crdv1.VolumeSnapshotResourcePlural,
Kind: reflect.TypeOf(crdv1.VolumeSnapshot{}).Name(),
},
},
}
res, err = clientset.ApiextensionsV1beta1().CustomResourceDefinitions().Create(crd)
if err != nil && !apierrors.IsAlreadyExists(err) {
glog.Fatalf("failed to create VolumeSnapshotResource: %#v, err: %#v",
res, err)
}
return nil
}
// WaitForSnapshotResource waits for the snapshot resource
func WaitForSnapshotResource(snapshotClient *rest.RESTClient) error {
return wait.Poll(100*time.Millisecond, 60*time.Second, func() (bool, error) {
_, err := snapshotClient.Get().
Resource(crdv1.VolumeSnapshotContentResourcePlural).DoRaw()
if err == nil {
return true, nil
}
if apierrors.IsNotFound(err) {
return false, nil
}
return false, err
})
}

183
cmd/csi-snapshotter/main.go
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@@ -1,7 +1,186 @@
/*
Copyright 2018 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import "fmt"
import (
"context"
"flag"
"fmt"
"os"
"os/signal"
"time"
"github.com/golang/glog"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"github.com/kubernetes-csi/external-snapshotter/pkg/connection"
"github.com/kubernetes-csi/external-snapshotter/pkg/controller"
clientset "github.com/kubernetes-csi/external-snapshotter/pkg/client/clientset/versioned"
informers "github.com/kubernetes-csi/external-snapshotter/pkg/client/informers/externalversions"
apiextensionsclient "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
)
const (
// Number of worker threads
threads = 10
// Default timeout of short CSI calls like GetPluginInfo
csiTimeout = time.Second
)
// Command line flags
var (
snapshotter = flag.String("snapshotter", "", "Name of the snapshotter. The snapshotter will only create snapshot data for snapshot that request a StorageClass with a snapshotter field set equal to this name.")
kubeconfig = flag.String("kubeconfig", "", "Absolute path to the kubeconfig file. Required only when running out of cluster.")
resync = flag.Duration("resync", 10*time.Second, "Resync interval of the controller.")
connectionTimeout = flag.Duration("connection-timeout", 1*time.Minute, "Timeout for waiting for CSI driver socket.")
csiAddress = flag.String("csi-address", "/run/csi/socket", "Address of the CSI driver socket.")
createSnapshotContentRetryCount = flag.Int("createSnapshotContentRetryCount", 5, "Number of retries when we create a snapshot data object for a snapshot.")
createSnapshotContentInterval = flag.Duration("createSnapshotContentInterval", 10*time.Second, "Interval between retries when we create a snapshot data object for a snapshot.")
resyncPeriod = flag.Duration("resyncPeriod", 60*time.Second, "The period that should be used to re-sync the snapshot.")
snapshotNamePrefix = flag.String("snapshot-name-prefix", "snapshot", "Prefix to apply to the name of a created snapshot")
snapshotNameUUIDLength = flag.Int("snapshot-name-uuid-length", -1, "Length in characters for the generated uuid of a created snapshot")
)
func main() {
fmt.Println("vim-go")
flag.Set("logtostderr", "true")
flag.Parse()
// Create the client config. Use kubeconfig if given, otherwise assume in-cluster.
config, err := buildConfig(*kubeconfig)
if err != nil {
glog.Error(err.Error())
os.Exit(1)
}
kubeClient, err := kubernetes.NewForConfig(config)
if err != nil {
glog.Error(err.Error())
os.Exit(1)
}
snapClient, err := clientset.NewForConfig(config)
if err != nil {
glog.Errorf("Error building snapshot clientset: %s", err.Error())
os.Exit(1)
}
factory := informers.NewSharedInformerFactory(snapClient, *resync)
// Create CRD resource
aeclientset, err := apiextensionsclient.NewForConfig(config)
if err != nil {
glog.Error(err.Error())
os.Exit(1)
}
// initialize CRD resource if it does not exist
err = CreateCRD(aeclientset)
if err != nil {
glog.Error(err.Error())
os.Exit(1)
}
// Connect to CSI.
csiConn, err := connection.New(*csiAddress, *connectionTimeout)
if err != nil {
glog.Error(err.Error())
os.Exit(1)
}
// Find driver name.
ctx, cancel := context.WithTimeout(context.Background(), csiTimeout)
defer cancel()
// Check it's ready
if err = waitForDriverReady(csiConn, *connectionTimeout); err != nil {
glog.Error(err.Error())
os.Exit(1)
}
// Find out if the driver supports create/delete snapshot.
supportsCreateSnapshot, err := csiConn.SupportsControllerCreateSnapshot(ctx)
if err != nil {
glog.Error(err.Error())
os.Exit(1)
}
if !supportsCreateSnapshot {
glog.Error("CSI driver does not support ControllerCreateSnapshot")
os.Exit(1)
}
glog.V(2).Infof("Start NewCSISnapshotController with snapshotter %s", *snapshotter)
ctrl := controller.NewCSISnapshotController(
snapClient,
kubeClient,
*snapshotter,
factory.Volumesnapshot().V1alpha1().VolumeSnapshots(),
factory.Volumesnapshot().V1alpha1().VolumeSnapshotContents(),
factory.Volumesnapshot().V1alpha1().VolumeSnapshotClasses(),
*createSnapshotContentRetryCount,
*createSnapshotContentInterval,
csiConn,
*connectionTimeout,
*resyncPeriod,
*snapshotNamePrefix,
*snapshotNameUUIDLength,
)
// run...
stopCh := make(chan struct{})
factory.Start(stopCh)
go ctrl.Run(threads, stopCh)
// ...until SIGINT
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
<-c
close(stopCh)
}
func buildConfig(kubeconfig string) (*rest.Config, error) {
if kubeconfig != "" {
return clientcmd.BuildConfigFromFlags("", kubeconfig)
}
return rest.InClusterConfig()
}
func waitForDriverReady(csiConn connection.CSIConnection, timeout time.Duration) error {
now := time.Now()
finish := now.Add(timeout)
var err error
for {
ctx, cancel := context.WithTimeout(context.Background(), csiTimeout)
defer cancel()
err = csiConn.Probe(ctx)
if err == nil {
glog.V(2).Infof("Probe succeeded")
return nil
}
glog.V(2).Infof("Probe failed with %s", err)
now := time.Now()
if now.After(finish) {
return fmt.Errorf("failed to probe the controller: %s", err)
}
time.Sleep(time.Second)
}
}