ecf1031dfc
Previously, multiple containers with the same mounted volume resulted in multiple FUSE processes. This behaviour was breaking parallel modifications from different containers, consumed extra resources, and after mounting via systemd was introduced, led to the total inability to mount the same volume into multiple containers on the same host. Now only one FUSE process is started per volume, per host.
244 lines
7.5 KiB
Go
244 lines
7.5 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 driver
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import (
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"fmt"
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"os"
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"os/exec"
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"regexp"
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"strconv"
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"github.com/yandex-cloud/k8s-csi-s3/pkg/mounter"
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"github.com/yandex-cloud/k8s-csi-s3/pkg/s3"
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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"
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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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csicommon "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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}
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func getMeta(bucketName, prefix string, context map[string]string) *s3.FSMeta {
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mountOptions := make([]string, 0)
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mountOptStr := context[mounter.OptionsKey]
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if mountOptStr != "" {
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re, _ := regexp.Compile(`([^\s"]+|"([^"\\]+|\\")*")+`)
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re2, _ := regexp.Compile(`"([^"\\]+|\\")*"`)
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re3, _ := regexp.Compile(`\\(.)`)
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for _, opt := range re.FindAll([]byte(mountOptStr), -1) {
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// Unquote options
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opt = re2.ReplaceAllFunc(opt, func(q []byte) []byte {
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return re3.ReplaceAll(q[1 : len(q)-1], []byte("$1"))
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})
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mountOptions = append(mountOptions, string(opt))
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}
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}
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capacity, _ := strconv.ParseInt(context["capacity"], 10, 64)
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return &s3.FSMeta{
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BucketName: bucketName,
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Prefix: prefix,
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Mounter: context[mounter.TypeKey],
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MountOptions: mountOptions,
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CapacityBytes: capacity,
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}
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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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volumeID := req.GetVolumeId()
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targetPath := req.GetTargetPath()
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stagingTargetPath := req.GetStagingTargetPath()
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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(volumeID) == 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(stagingTargetPath) == 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(targetPath) == 0 {
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return nil, status.Error(codes.InvalidArgument, "Target path missing in request")
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}
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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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// TODO: Implement readOnly & mountFlags
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readOnly := req.GetReadonly()
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mountFlags := req.GetVolumeCapability().GetMount().GetMountFlags()
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attrib := req.GetVolumeContext()
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glog.V(4).Infof("target %v\nreadonly %v\nvolumeId %v\nattributes %v\nmountflags %v\n",
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targetPath, readOnly, volumeID, attrib, mountFlags)
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cmd := exec.Command("mount", "--bind", stagingTargetPath, targetPath)
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cmd.Stderr = os.Stderr
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glog.V(3).Infof("Binding volume %v from %v to %v", volumeID, stagingTargetPath, targetPath)
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out, err := cmd.Output()
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if err != nil {
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return nil, fmt.Errorf("Error running mount --bind %v %v: %s", stagingTargetPath, targetPath, out)
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}
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glog.V(4).Infof("s3: volume %s successfully 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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volumeID := req.GetVolumeId()
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targetPath := req.GetTargetPath()
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// Check arguments
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if len(volumeID) == 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(targetPath) == 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 err := mounter.Unmount(targetPath); 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: volume %s has been unmounted.", volumeID)
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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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volumeID := req.GetVolumeId()
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stagingTargetPath := req.GetStagingTargetPath()
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bucketName, prefix := volumeIDToBucketPrefix(volumeID)
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// Check arguments
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if len(volumeID) == 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(stagingTargetPath) == 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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notMnt, err := checkMount(stagingTargetPath)
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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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client, err := s3.NewClientFromSecret(req.GetSecrets())
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if err != nil {
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return nil, fmt.Errorf("failed to initialize S3 client: %s", err)
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}
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meta := getMeta(bucketName, prefix, req.VolumeContext)
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mounter, err := mounter.New(meta, client.Config)
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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(stagingTargetPath, volumeID); 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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volumeID := req.GetVolumeId()
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stagingTargetPath := req.GetStagingTargetPath()
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// Check arguments
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if len(volumeID) == 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(stagingTargetPath) == 0 {
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return nil, status.Error(codes.InvalidArgument, "Target path missing in request")
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}
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proc, err := mounter.FindFuseMountProcess(stagingTargetPath)
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if err != nil {
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return nil, err
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}
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exists := false
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if proc == nil {
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exists, err = mounter.SystemdUnmount(volumeID)
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if exists && err != nil {
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return nil, err
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}
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}
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if !exists {
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err = mounter.FuseUnmount(stagingTargetPath)
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}
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glog.V(4).Infof("s3: volume %s has been unmounted from stage path %v.", volumeID, stagingTargetPath)
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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 (ns *nodeServer) NodeExpandVolume(ctx context.Context, req *csi.NodeExpandVolumeRequest) (*csi.NodeExpandVolumeResponse, error) {
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return &csi.NodeExpandVolumeResponse{}, status.Error(codes.Unimplemented, "NodeExpandVolume is not implemented")
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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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