0010066fe3
This helps the reliability of s3backer as the fuse mount is done on NodeStageVolume and only once per volume per node.
199 lines
5.8 KiB
Go
199 lines
5.8 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package s3
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import (
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"os"
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"github.com/golang/glog"
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"golang.org/x/net/context"
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"github.com/container-storage-interface/spec/lib/go/csi/v0"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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"k8s.io/kubernetes/pkg/util/mount"
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"github.com/kubernetes-csi/drivers/pkg/csi-common"
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)
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type nodeServer struct {
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*csicommon.DefaultNodeServer
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*s3
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}
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func (ns *nodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublishVolumeRequest) (*csi.NodePublishVolumeResponse, error) {
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// Check arguments
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if req.GetVolumeCapability() == nil {
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return nil, status.Error(codes.InvalidArgument, "Volume capability missing in request")
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}
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if len(req.GetVolumeId()) == 0 {
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return nil, status.Error(codes.InvalidArgument, "Volume ID missing in request")
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}
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if len(req.GetStagingTargetPath()) == 0 {
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return nil, status.Error(codes.InvalidArgument, "Staging Target path missing in request")
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}
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if len(req.GetTargetPath()) == 0 {
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return nil, status.Error(codes.InvalidArgument, "Target path missing in request")
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}
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targetPath := req.GetTargetPath()
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stagingPath := req.GetStagingTargetPath()
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notMnt, err := checkMount(targetPath)
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if err != nil {
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return nil, status.Error(codes.Internal, err.Error())
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}
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if !notMnt {
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return &csi.NodePublishVolumeResponse{}, nil
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}
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deviceID := ""
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if req.GetPublishInfo() != nil {
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deviceID = req.GetPublishInfo()[deviceID]
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}
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readOnly := req.GetReadonly()
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volumeID := req.GetVolumeId()
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attrib := req.GetVolumeAttributes()
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mountFlags := req.GetVolumeCapability().GetMount().GetMountFlags()
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glog.V(4).Infof("target %v\ndevice %v\nreadonly %v\nvolumeId %v\nattributes %v\nmountflags %v\n",
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targetPath, deviceID, readOnly, volumeID, attrib, mountFlags)
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mounter, err := newMounter(volumeID, ns.s3.cfg)
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if err != nil {
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return nil, err
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}
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if err := mounter.Mount(stagingPath, targetPath); err != nil {
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return nil, err
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}
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glog.V(4).Infof("s3: bucket %s successfuly mounted to %s", volumeID, targetPath)
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return &csi.NodePublishVolumeResponse{}, nil
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}
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func (ns *nodeServer) NodeUnpublishVolume(ctx context.Context, req *csi.NodeUnpublishVolumeRequest) (*csi.NodeUnpublishVolumeResponse, error) {
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// Check arguments
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if len(req.GetVolumeId()) == 0 {
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return nil, status.Error(codes.InvalidArgument, "Volume ID missing in request")
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}
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if len(req.GetTargetPath()) == 0 {
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return nil, status.Error(codes.InvalidArgument, "Target path missing in request")
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}
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mounter, err := newMounter(req.GetVolumeId(), ns.s3.cfg)
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if err != nil {
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return nil, err
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}
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if err := mounter.Unmount(req.GetTargetPath()); err != nil {
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return nil, status.Error(codes.Internal, err.Error())
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}
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glog.V(4).Infof("s3: bucket %s has been unmounted.", req.GetVolumeId())
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return &csi.NodeUnpublishVolumeResponse{}, nil
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}
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func (ns *nodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVolumeRequest) (*csi.NodeStageVolumeResponse, error) {
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// Check arguments
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if len(req.GetVolumeId()) == 0 {
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return nil, status.Error(codes.InvalidArgument, "Volume ID missing in request")
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}
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if len(req.GetStagingTargetPath()) == 0 {
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return nil, status.Error(codes.InvalidArgument, "Target path missing in request")
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}
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if req.VolumeCapability == nil {
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return nil, status.Error(codes.InvalidArgument, "NodeStageVolume Volume Capability must be provided")
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}
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stagingPath := req.GetStagingTargetPath()
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notMnt, err := checkMount(stagingPath)
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if err != nil {
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return nil, status.Error(codes.Internal, err.Error())
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}
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if !notMnt {
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return &csi.NodeStageVolumeResponse{}, nil
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}
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mounter, err := newMounter(req.GetVolumeId(), ns.s3.cfg)
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if err != nil {
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return nil, err
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}
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if err := mounter.Stage(stagingPath); err != nil {
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return nil, err
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}
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return &csi.NodeStageVolumeResponse{}, nil
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}
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func (ns *nodeServer) NodeUnstageVolume(ctx context.Context, req *csi.NodeUnstageVolumeRequest) (*csi.NodeUnstageVolumeResponse, error) {
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// Check arguments
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if len(req.GetVolumeId()) == 0 {
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return nil, status.Error(codes.InvalidArgument, "Volume ID missing in request")
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}
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if len(req.GetStagingTargetPath()) == 0 {
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return nil, status.Error(codes.InvalidArgument, "Target path missing in request")
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}
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mounter, err := newMounter(req.GetVolumeId(), ns.s3.cfg)
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if err != nil {
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return nil, err
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}
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if err := mounter.Unstage(req.GetStagingTargetPath()); err != nil {
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return nil, err
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}
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return &csi.NodeUnstageVolumeResponse{}, nil
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}
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// NodeGetCapabilities returns the supported capabilities of the node server
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func (ns *nodeServer) NodeGetCapabilities(ctx context.Context, req *csi.NodeGetCapabilitiesRequest) (*csi.NodeGetCapabilitiesResponse, error) {
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// currently there is a single NodeServer capability according to the spec
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nscap := &csi.NodeServiceCapability{
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Type: &csi.NodeServiceCapability_Rpc{
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Rpc: &csi.NodeServiceCapability_RPC{
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Type: csi.NodeServiceCapability_RPC_STAGE_UNSTAGE_VOLUME,
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},
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},
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}
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return &csi.NodeGetCapabilitiesResponse{
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Capabilities: []*csi.NodeServiceCapability{
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nscap,
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},
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}, nil
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}
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func checkMount(targetPath string) (bool, error) {
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notMnt, err := mount.New("").IsLikelyNotMountPoint(targetPath)
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if err != nil {
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if os.IsNotExist(err) {
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if err = os.MkdirAll(targetPath, 0750); err != nil {
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return false, err
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}
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notMnt = true
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} else {
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return false, err
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}
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}
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return notMnt, nil
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}
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