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Merge pull request #7 from xing-yang/snapshot_controller
Add Snapshot Controller
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/* | ||
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. | ||
*/ | ||
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package main | ||
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import ( | ||
"reflect" | ||
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"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/client-go/rest" | ||
) | ||
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const ( | ||
// SnapshotPVCAnnotation is "snapshot.alpha.kubernetes.io/snapshot" | ||
SnapshotPVCAnnotation = "volumesnapshot.csi.k8s.io/snapshot" | ||
) | ||
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// 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 | ||
} | ||
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config := *cfg | ||
config.GroupVersion = &crdv1.SchemeGroupVersion | ||
config.APIPath = "/apis" | ||
config.ContentType = runtime.ContentTypeJSON | ||
config.NegotiatedSerializer = serializer.DirectCodecFactory{CodecFactory: serializer.NewCodecFactory(scheme)} | ||
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client, err := rest.RESTClientFor(&config) | ||
if err != nil { | ||
return nil, nil, err | ||
} | ||
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return client, scheme, nil | ||
} | ||
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// 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) | ||
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if err != nil && !apierrors.IsAlreadyExists(err) { | ||
glog.Fatalf("failed to create VolumeSnapshotResource: %#v, err: %#v", | ||
res, err) | ||
} | ||
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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) | ||
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if err != nil && !apierrors.IsAlreadyExists(err) { | ||
glog.Fatalf("failed to create VolumeSnapshotContentResource: %#v, err: %#v", | ||
res, err) | ||
} | ||
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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) | ||
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if err != nil && !apierrors.IsAlreadyExists(err) { | ||
glog.Fatalf("failed to create VolumeSnapshotResource: %#v, err: %#v", | ||
res, err) | ||
} | ||
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return nil | ||
} |
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@@ -1,7 +1,200 @@ | ||
/* | ||
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. | ||
*/ | ||
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package main | ||
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import "fmt" | ||
import ( | ||
"context" | ||
"flag" | ||
"fmt" | ||
"os" | ||
"os/signal" | ||
"time" | ||
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"github.com/golang/glog" | ||
"k8s.io/client-go/kubernetes" | ||
"k8s.io/client-go/rest" | ||
"k8s.io/client-go/tools/clientcmd" | ||
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"github.com/kubernetes-csi/external-snapshotter/pkg/connection" | ||
"github.com/kubernetes-csi/external-snapshotter/pkg/controller" | ||
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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" | ||
) | ||
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const ( | ||
// Number of worker threads | ||
threads = 10 | ||
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// Default timeout of short CSI calls like GetPluginInfo | ||
csiTimeout = time.Second | ||
) | ||
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// Command line flags | ||
var ( | ||
snapshotter = flag.String("snapshotter", "", "Name of the snapshotter. The snapshotter will only create snapshot content for snapshot that requests a VolumeSnapshotClass 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.") | ||
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("create-snapshotcontent-retrycount", 5, "Number of retries when we create a snapshot content object for a snapshot.") | ||
createSnapshotContentInterval = flag.Duration("create-snapshotcontent-interval", 10*time.Second, "Interval between retries when we create a snapshot content object for a snapshot.") | ||
resyncPeriod = flag.Duration("resync-period", 60*time.Second, "Resync interval of the controller.") | ||
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. Defaults behavior is to NOT truncate.") | ||
) | ||
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func main() { | ||
fmt.Println("vim-go") | ||
flag.Set("logtostderr", "true") | ||
flag.Parse() | ||
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// 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) | ||
} | ||
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kubeClient, err := kubernetes.NewForConfig(config) | ||
if err != nil { | ||
glog.Error(err.Error()) | ||
os.Exit(1) | ||
} | ||
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snapClient, err := clientset.NewForConfig(config) | ||
if err != nil { | ||
glog.Errorf("Error building snapshot clientset: %s", err.Error()) | ||
os.Exit(1) | ||
} | ||
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factory := informers.NewSharedInformerFactory(snapClient, *resyncPeriod) | ||
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// Create CRD resource | ||
aeclientset, err := apiextensionsclient.NewForConfig(config) | ||
if err != nil { | ||
glog.Error(err.Error()) | ||
os.Exit(1) | ||
} | ||
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// initialize CRD resource if it does not exist | ||
err = CreateCRD(aeclientset) | ||
if err != nil { | ||
glog.Error(err.Error()) | ||
os.Exit(1) | ||
} | ||
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// Connect to CSI. | ||
csiConn, err := connection.New(*csiAddress, *connectionTimeout) | ||
if err != nil { | ||
glog.Error(err.Error()) | ||
os.Exit(1) | ||
} | ||
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// Pass a context with a timeout | ||
ctx, cancel := context.WithTimeout(context.Background(), csiTimeout) | ||
defer cancel() | ||
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// Find driver name | ||
if *snapshotter == "" { | ||
*snapshotter, err = csiConn.GetDriverName(ctx) | ||
if err != nil { | ||
glog.Error(err.Error()) | ||
os.Exit(1) | ||
} | ||
} | ||
glog.V(2).Infof("CSI driver name: %q", *snapshotter) | ||
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// Check it's ready | ||
if err = waitForDriverReady(csiConn, *connectionTimeout); err != nil { | ||
glog.Error(err.Error()) | ||
os.Exit(1) | ||
} | ||
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// 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.Errorf("CSI driver %s does not support ControllerCreateSnapshot", *snapshotter) | ||
os.Exit(1) | ||
} | ||
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if len(*snapshotNamePrefix) == 0 { | ||
glog.Error("Snapshot name prefix cannot be of length 0") | ||
os.Exit(1) | ||
} | ||
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glog.V(2).Infof("Start NewCSISnapshotController with snapshotter [%s] kubeconfig [%s] connectionTimeout [%+v] csiAddress [%s] createSnapshotContentRetryCount [%d] createSnapshotContentInterval [%+v] resyncPeriod [%+v] snapshotNamePrefix [%s] snapshotNameUUIDLength [%d]", *snapshotter, *kubeconfig, *connectionTimeout, *csiAddress, createSnapshotContentRetryCount, *createSnapshotContentInterval, *resyncPeriod, *snapshotNamePrefix, snapshotNameUUIDLength) | ||
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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, | ||
) | ||
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// run... | ||
stopCh := make(chan struct{}) | ||
factory.Start(stopCh) | ||
go ctrl.Run(threads, stopCh) | ||
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// ...until SIGINT | ||
c := make(chan os.Signal, 1) | ||
signal.Notify(c, os.Interrupt) | ||
<-c | ||
close(stopCh) | ||
} | ||
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func buildConfig(kubeconfig string) (*rest.Config, error) { | ||
if kubeconfig != "" { | ||
return clientcmd.BuildConfigFromFlags("", kubeconfig) | ||
} | ||
return rest.InClusterConfig() | ||
} | ||
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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) | ||
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now := time.Now() | ||
if now.After(finish) { | ||
return fmt.Errorf("failed to probe the controller: %s", err) | ||
} | ||
time.Sleep(time.Second) | ||
} | ||
} |
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