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ceph-csi/pkg/rbd/controllerserver.go
Humble Chirammal cb77ff5d87 Migrate rbd package to klog from glog
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
2019-02-05 12:09:04 +00:00

554 lines
18 KiB
Go

/*
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 rbd
import (
"fmt"
"os"
"os/exec"
"syscall"
"github.com/ceph/ceph-csi/pkg/util"
"github.com/container-storage-interface/spec/lib/go/csi"
"github.com/golang/protobuf/ptypes"
"github.com/golang/protobuf/ptypes/timestamp"
"github.com/kubernetes-csi/drivers/pkg/csi-common"
"github.com/pborman/uuid"
"github.com/pkg/errors"
"golang.org/x/net/context"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"k8s.io/klog"
)
const (
oneGB = 1073741824
)
// ControllerServer struct of rbd CSI driver with supported methods of CSI
// controller server spec.
type ControllerServer struct {
*csicommon.DefaultControllerServer
MetadataStore util.CachePersister
}
var (
rbdVolumes = map[string]*rbdVolume{}
rbdSnapshots = map[string]*rbdSnapshot{}
)
// LoadExDataFromMetadataStore loads the rbd volume and snapshot
// info from metadata store
func (cs *ControllerServer) LoadExDataFromMetadataStore() error {
vol := &rbdVolume{}
// nolint
cs.MetadataStore.ForAll("csi-rbd-vol-", vol, func(identifier string) error {
rbdVolumes[identifier] = vol
return nil
})
snap := &rbdSnapshot{}
// nolint
cs.MetadataStore.ForAll("csi-rbd-(.*)-snap-", snap, func(identifier string) error {
rbdSnapshots[identifier] = snap
return nil
})
klog.Infof("Loaded %d volumes and %d snapshots from metadata store", len(rbdVolumes), len(rbdSnapshots))
return nil
}
func (cs *ControllerServer) validateVolumeReq(req *csi.CreateVolumeRequest) error {
if err := cs.Driver.ValidateControllerServiceRequest(csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME); err != nil {
klog.V(3).Infof("invalid create volume req: %v", req)
return err
}
// Check sanity of request Name, Volume Capabilities
if len(req.Name) == 0 {
return status.Error(codes.InvalidArgument, "Volume Name cannot be empty")
}
if req.VolumeCapabilities == nil {
return status.Error(codes.InvalidArgument, "Volume Capabilities cannot be empty")
}
return nil
}
func parseVolCreateRequest(req *csi.CreateVolumeRequest) (*rbdVolume, error) {
// TODO (sbezverk) Last check for not exceeding total storage capacity
rbdVol, err := getRBDVolumeOptions(req.GetParameters())
if err != nil {
return nil, err
}
// Generating Volume Name and Volume ID, as according to CSI spec they MUST be different
volName := req.GetName()
uniqueID := uuid.NewUUID().String()
if len(volName) == 0 {
volName = rbdVol.Pool + "-dynamic-pvc-" + uniqueID
}
rbdVol.VolName = volName
volumeID := "csi-rbd-vol-" + uniqueID
rbdVol.VolID = volumeID
// Volume Size - Default is 1 GiB
volSizeBytes := int64(oneGB)
if req.GetCapacityRange() != nil {
volSizeBytes = req.GetCapacityRange().GetRequiredBytes()
}
rbdVol.VolSize = volSizeBytes
return rbdVol, nil
}
// CreateVolume creates the volume in backend and store the volume metadata
func (cs *ControllerServer) CreateVolume(ctx context.Context, req *csi.CreateVolumeRequest) (*csi.CreateVolumeResponse, error) {
if err := cs.validateVolumeReq(req); err != nil {
return nil, err
}
volumeNameMutex.LockKey(req.GetName())
defer func() {
if err := volumeNameMutex.UnlockKey(req.GetName()); err != nil {
klog.Warningf("failed to unlock mutex volume:%s %v", req.GetName(), err)
}
}()
// Need to check for already existing volume name, and if found
// check for the requested capacity and already allocated capacity
if exVol, err := getRBDVolumeByName(req.GetName()); err == nil {
// Since err is nil, it means the volume with the same name already exists
// need to check if the size of existing volume is the same as in new
// request
if exVol.VolSize >= req.GetCapacityRange().GetRequiredBytes() {
// existing volume is compatible with new request and should be reused.
// TODO (sbezverk) Do I need to make sure that RBD volume still exists?
return &csi.CreateVolumeResponse{
Volume: &csi.Volume{
VolumeId: exVol.VolID,
CapacityBytes: exVol.VolSize,
VolumeContext: req.GetParameters(),
},
}, nil
}
return nil, status.Errorf(codes.AlreadyExists, "Volume with the same name: %s but with different size already exist", req.GetName())
}
rbdVol, err := parseVolCreateRequest(req)
if err != nil {
return nil, err
}
volSizeGB := int(rbdVol.VolSize / 1024 / 1024 / 1024)
// Check if there is already RBD image with requested name
err = cs.checkRBDStatus(rbdVol, req, volSizeGB)
if err != nil {
return nil, err
}
if createErr := cs.MetadataStore.Create(rbdVol.VolID, rbdVol); createErr != nil {
klog.Warningf("failed to store volume metadata with error: %v", err)
if err = deleteRBDImage(rbdVol, rbdVol.AdminID, req.GetSecrets()); err != nil {
klog.V(3).Infof("failed to delete rbd image: %s/%s with error: %v", rbdVol.Pool, rbdVol.VolName, err)
return nil, err
}
return nil, createErr
}
rbdVolumes[rbdVol.VolID] = rbdVol
return &csi.CreateVolumeResponse{
Volume: &csi.Volume{
VolumeId: rbdVol.VolID,
CapacityBytes: rbdVol.VolSize,
VolumeContext: req.GetParameters(),
},
}, nil
}
func (cs *ControllerServer) checkRBDStatus(rbdVol *rbdVolume, req *csi.CreateVolumeRequest, volSizeGB int) error {
var err error
// Check if there is already RBD image with requested name
found, _, _ := rbdStatus(rbdVol, rbdVol.UserID, req.GetSecrets()) // #nosec
if !found {
// if VolumeContentSource is not nil, this request is for snapshot
if req.VolumeContentSource != nil {
if err = cs.checkSnapshot(req, rbdVol); err != nil {
return err
}
} else {
err = createRBDImage(rbdVol, volSizeGB, rbdVol.AdminID, req.GetSecrets())
if err != nil {
klog.Warningf("failed to create volume: %v", err)
return err
}
klog.V(4).Infof("create volume %s", rbdVol.VolName)
}
}
return nil
}
func (cs *ControllerServer) checkSnapshot(req *csi.CreateVolumeRequest, rbdVol *rbdVolume) error {
snapshot := req.VolumeContentSource.GetSnapshot()
if snapshot == nil {
return status.Error(codes.InvalidArgument, "Volume Snapshot cannot be empty")
}
snapshotID := snapshot.GetSnapshotId()
if len(snapshotID) == 0 {
return status.Error(codes.InvalidArgument, "Volume Snapshot ID cannot be empty")
}
rbdSnap := &rbdSnapshot{}
if err := cs.MetadataStore.Get(snapshotID, rbdSnap); err != nil {
return err
}
err := restoreSnapshot(rbdVol, rbdSnap, rbdVol.AdminID, req.GetSecrets())
if err != nil {
return err
}
klog.V(4).Infof("create volume %s from snapshot %s", req.GetName(), rbdSnap.SnapName)
return nil
}
// DeleteVolume deletes the volume in backend and removes the volume metadata
// from store
func (cs *ControllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVolumeRequest) (*csi.DeleteVolumeResponse, error) {
if err := cs.Driver.ValidateControllerServiceRequest(csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME); err != nil {
klog.Warningf("invalid delete volume req: %v", req)
return nil, err
}
// For now the image get unconditionally deleted, but here retention policy can be checked
volumeID := req.GetVolumeId()
volumeIDMutex.LockKey(volumeID)
defer func() {
if err := volumeIDMutex.UnlockKey(volumeID); err != nil {
klog.Warningf("failed to unlock mutex volume:%s %v", volumeID, err)
}
}()
rbdVol := &rbdVolume{}
if err := cs.MetadataStore.Get(volumeID, rbdVol); err != nil {
if os.IsNotExist(errors.Cause(err)) {
return &csi.DeleteVolumeResponse{}, nil
}
return nil, err
}
volName := rbdVol.VolName
// Deleting rbd image
klog.V(4).Infof("deleting volume %s", volName)
if err := deleteRBDImage(rbdVol, rbdVol.AdminID, req.GetSecrets()); err != nil {
// TODO: can we detect "already deleted" situations here and proceed?
klog.V(3).Infof("failed to delete rbd image: %s/%s with error: %v", rbdVol.Pool, volName, err)
return nil, err
}
if err := cs.MetadataStore.Delete(volumeID); err != nil {
return nil, err
}
delete(rbdVolumes, volumeID)
return &csi.DeleteVolumeResponse{}, nil
}
// ValidateVolumeCapabilities checks whether the volume capabilities requested
// are supported.
func (cs *ControllerServer) ValidateVolumeCapabilities(ctx context.Context, req *csi.ValidateVolumeCapabilitiesRequest) (*csi.ValidateVolumeCapabilitiesResponse, error) {
for _, cap := range req.VolumeCapabilities {
if cap.GetAccessMode().GetMode() != csi.VolumeCapability_AccessMode_SINGLE_NODE_WRITER {
return &csi.ValidateVolumeCapabilitiesResponse{Message: ""}, nil
}
}
return &csi.ValidateVolumeCapabilitiesResponse{
Confirmed: &csi.ValidateVolumeCapabilitiesResponse_Confirmed{
VolumeCapabilities: req.VolumeCapabilities,
},
}, nil
}
// ControllerUnpublishVolume returns success response
func (cs *ControllerServer) ControllerUnpublishVolume(ctx context.Context, req *csi.ControllerUnpublishVolumeRequest) (*csi.ControllerUnpublishVolumeResponse, error) {
return &csi.ControllerUnpublishVolumeResponse{}, nil
}
// ControllerPublishVolume returns success response
func (cs *ControllerServer) ControllerPublishVolume(ctx context.Context, req *csi.ControllerPublishVolumeRequest) (*csi.ControllerPublishVolumeResponse, error) {
return &csi.ControllerPublishVolumeResponse{}, nil
}
// CreateSnapshot creates the snapshot in backend and stores metadata
// in store
func (cs *ControllerServer) CreateSnapshot(ctx context.Context, req *csi.CreateSnapshotRequest) (*csi.CreateSnapshotResponse, error) {
if err := cs.validateSnapshotReq(req); err != nil {
return nil, err
}
snapshotNameMutex.LockKey(req.GetName())
defer func() {
if err := snapshotNameMutex.UnlockKey(req.GetName()); err != nil {
klog.Warningf("failed to unlock mutex snapshot:%s %v", req.GetName(), err)
}
}()
// Need to check for already existing snapshot name, and if found
// check for the requested source volume id and already allocated source volume id
if exSnap, err := getRBDSnapshotByName(req.GetName()); err == nil {
if req.SourceVolumeId == exSnap.SourceVolumeID {
return &csi.CreateSnapshotResponse{
Snapshot: &csi.Snapshot{
SizeBytes: exSnap.SizeBytes,
SnapshotId: exSnap.SnapID,
SourceVolumeId: exSnap.SourceVolumeID,
CreationTime: &timestamp.Timestamp{
Seconds: exSnap.CreatedAt,
},
ReadyToUse: true,
},
}, nil
}
return nil, status.Errorf(codes.AlreadyExists, "Snapshot with the same name: %s but with different source volume id already exist", req.GetName())
}
rbdSnap, err := getRBDSnapshotOptions(req.GetParameters())
if err != nil {
return nil, err
}
// Generating Snapshot Name and Snapshot ID, as according to CSI spec they MUST be different
snapName := req.GetName()
uniqueID := uuid.NewUUID().String()
rbdVolume, err := getRBDVolumeByID(req.GetSourceVolumeId())
if err != nil {
return nil, status.Errorf(codes.NotFound, "Source Volume ID %s cannot found", req.GetSourceVolumeId())
}
if !hasSnapshotFeature(rbdVolume.ImageFeatures) {
return nil, fmt.Errorf("volume(%s) has not snapshot feature(layering)", req.GetSourceVolumeId())
}
rbdSnap.VolName = rbdVolume.VolName
rbdSnap.SnapName = snapName
snapshotID := "csi-rbd-" + rbdVolume.VolName + "-snap-" + uniqueID
rbdSnap.SnapID = snapshotID
rbdSnap.SourceVolumeID = req.GetSourceVolumeId()
rbdSnap.SizeBytes = rbdVolume.VolSize
err = cs.doSnapshot(rbdSnap, req.GetSecrets())
// if we already have the snapshot, return the snapshot
if err != nil {
return nil, err
}
rbdSnap.CreatedAt = ptypes.TimestampNow().GetSeconds()
if err = cs.storeSnapMetadata(rbdSnap, req.GetSecrets()); err != nil {
return nil, err
}
rbdSnapshots[snapshotID] = rbdSnap
return &csi.CreateSnapshotResponse{
Snapshot: &csi.Snapshot{
SizeBytes: rbdSnap.SizeBytes,
SnapshotId: snapshotID,
SourceVolumeId: req.GetSourceVolumeId(),
CreationTime: &timestamp.Timestamp{
Seconds: rbdSnap.CreatedAt,
},
ReadyToUse: true,
},
}, nil
}
func (cs *ControllerServer) storeSnapMetadata(rbdSnap *rbdSnapshot, secret map[string]string) error {
errCreate := cs.MetadataStore.Create(rbdSnap.SnapID, rbdSnap)
if errCreate != nil {
klog.Warningf("rbd: failed to store snapInfo with error: %v", errCreate)
// Unprotect snapshot
err := unprotectSnapshot(rbdSnap, rbdSnap.AdminID, secret)
if err != nil {
return status.Errorf(codes.Unknown, "This Snapshot should be removed but failed to unprotect snapshot: %s/%s with error: %v", rbdSnap.Pool, rbdSnap.SnapName, err)
}
// Deleting snapshot
klog.V(4).Infof("deleting Snaphot %s", rbdSnap.SnapName)
if err = deleteSnapshot(rbdSnap, rbdSnap.AdminID, secret); err != nil {
return status.Errorf(codes.Unknown, "This Snapshot should be removed but failed to delete snapshot: %s/%s with error: %v", rbdSnap.Pool, rbdSnap.SnapName, err)
}
}
return errCreate
}
func (cs *ControllerServer) validateSnapshotReq(req *csi.CreateSnapshotRequest) error {
if err := cs.Driver.ValidateControllerServiceRequest(csi.ControllerServiceCapability_RPC_CREATE_DELETE_SNAPSHOT); err != nil {
klog.Warningf("invalid create snapshot req: %v", req)
return err
}
// Check sanity of request Snapshot Name, Source Volume Id
if len(req.Name) == 0 {
return status.Error(codes.InvalidArgument, "Snapshot Name cannot be empty")
}
if len(req.SourceVolumeId) == 0 {
return status.Error(codes.InvalidArgument, "Source Volume ID cannot be empty")
}
return nil
}
func (cs *ControllerServer) doSnapshot(rbdSnap *rbdSnapshot, secret map[string]string) error {
err := createSnapshot(rbdSnap, rbdSnap.AdminID, secret)
// if we already have the snapshot, return the snapshot
if err != nil {
if exitErr, ok := err.(*exec.ExitError); ok {
if status, ok := exitErr.Sys().(syscall.WaitStatus); ok {
if status.ExitStatus() == int(syscall.EEXIST) {
klog.Warningf("Snapshot with the same name: %s, we return this.", rbdSnap.SnapName)
} else {
klog.Warningf("failed to create snapshot: %v", err)
return err
}
} else {
klog.Warningf("failed to create snapshot: %v", err)
return err
}
} else {
klog.Warningf("failed to create snapshot: %v", err)
return err
}
} else {
klog.V(4).Infof("create snapshot %s", rbdSnap.SnapName)
err = protectSnapshot(rbdSnap, rbdSnap.AdminID, secret)
if err != nil {
err = deleteSnapshot(rbdSnap, rbdSnap.AdminID, secret)
if err != nil {
return fmt.Errorf("snapshot is created but failed to protect and delete snapshot: %v", err)
}
return fmt.Errorf("snapshot is created but failed to protect snapshot")
}
}
return nil
}
// DeleteSnapshot deletes the snapshot in backend and removes the
//snapshot metadata from store
func (cs *ControllerServer) DeleteSnapshot(ctx context.Context, req *csi.DeleteSnapshotRequest) (*csi.DeleteSnapshotResponse, error) {
if err := cs.Driver.ValidateControllerServiceRequest(csi.ControllerServiceCapability_RPC_CREATE_DELETE_SNAPSHOT); err != nil {
klog.Warningf("invalid delete snapshot req: %v", req)
return nil, err
}
snapshotID := req.GetSnapshotId()
if len(snapshotID) == 0 {
return nil, status.Error(codes.InvalidArgument, "Snapshot ID cannot be empty")
}
snapshotIDMutex.LockKey(snapshotID)
defer func() {
if err := snapshotIDMutex.UnlockKey(snapshotID); err != nil {
klog.Warningf("failed to unlock mutex snapshot:%s %v", snapshotID, err)
}
}()
rbdSnap := &rbdSnapshot{}
if err := cs.MetadataStore.Get(snapshotID, rbdSnap); err != nil {
return nil, err
}
// Unprotect snapshot
err := unprotectSnapshot(rbdSnap, rbdSnap.AdminID, req.GetSecrets())
if err != nil {
return nil, status.Errorf(codes.FailedPrecondition, "failed to unprotect snapshot: %s/%s with error: %v", rbdSnap.Pool, rbdSnap.SnapName, err)
}
// Deleting snapshot
klog.V(4).Infof("deleting Snaphot %s", rbdSnap.SnapName)
if err := deleteSnapshot(rbdSnap, rbdSnap.AdminID, req.GetSecrets()); err != nil {
return nil, status.Errorf(codes.FailedPrecondition, "failed to delete snapshot: %s/%s with error: %v", rbdSnap.Pool, rbdSnap.SnapName, err)
}
if err := cs.MetadataStore.Delete(snapshotID); err != nil {
return nil, err
}
delete(rbdSnapshots, snapshotID)
return &csi.DeleteSnapshotResponse{}, nil
}
// ListSnapshots lists the snapshots in the store
func (cs *ControllerServer) ListSnapshots(ctx context.Context, req *csi.ListSnapshotsRequest) (*csi.ListSnapshotsResponse, error) {
if err := cs.Driver.ValidateControllerServiceRequest(csi.ControllerServiceCapability_RPC_LIST_SNAPSHOTS); err != nil {
klog.Warningf("invalid list snapshot req: %v", req)
return nil, err
}
sourceVolumeID := req.GetSourceVolumeId()
// TODO (sngchlko) list with token
// TODO (#94) protect concurrent access to global data structures
// list only a specific snapshot which has snapshot ID
if snapshotID := req.GetSnapshotId(); len(snapshotID) != 0 {
if rbdSnap, ok := rbdSnapshots[snapshotID]; ok {
// if source volume ID also set, check source volume id on the cache.
if len(sourceVolumeID) != 0 && rbdSnap.SourceVolumeID != sourceVolumeID {
return nil, status.Errorf(codes.Unknown, "Requested Source Volume ID %s is different from %s", sourceVolumeID, rbdSnap.SourceVolumeID)
}
return &csi.ListSnapshotsResponse{
Entries: []*csi.ListSnapshotsResponse_Entry{
{
Snapshot: &csi.Snapshot{
SizeBytes: rbdSnap.SizeBytes,
SnapshotId: rbdSnap.SnapID,
SourceVolumeId: rbdSnap.SourceVolumeID,
CreationTime: &timestamp.Timestamp{
Seconds: rbdSnap.CreatedAt,
},
ReadyToUse: true,
},
},
},
}, nil
}
return nil, status.Errorf(codes.NotFound, "Snapshot ID %s cannot found", snapshotID)
}
entries := []*csi.ListSnapshotsResponse_Entry{}
for _, rbdSnap := range rbdSnapshots {
// if source volume ID also set, check source volume id on the cache.
if len(sourceVolumeID) != 0 && rbdSnap.SourceVolumeID != sourceVolumeID {
continue
}
entries = append(entries, &csi.ListSnapshotsResponse_Entry{
Snapshot: &csi.Snapshot{
SizeBytes: rbdSnap.SizeBytes,
SnapshotId: rbdSnap.SnapID,
SourceVolumeId: rbdSnap.SourceVolumeID,
CreationTime: &timestamp.Timestamp{
Seconds: rbdSnap.CreatedAt,
},
ReadyToUse: true,
},
})
}
return &csi.ListSnapshotsResponse{
Entries: entries,
}, nil
}