Implement CSI volume snapshots
parent
a378789f10
commit
b3f1fd3848
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@ -9,6 +9,7 @@ require (
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golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb
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golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
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google.golang.org/grpc v1.33.1
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google.golang.org/protobuf v1.24.0
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k8s.io/klog v1.0.0
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k8s.io/utils v0.0.0-20210305010621-2afb4311ab10
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)
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@ -20,6 +20,7 @@ import (
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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"google.golang.org/protobuf/types/known/timestamppb"
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"github.com/container-storage-interface/spec/lib/go/csi"
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)
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@ -45,6 +46,7 @@ type InodeConfig struct
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ParentPool uint64 `json:"parent_pool,omitempty"`
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ParentId uint64 `json:"parent_id,omitempty"`
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Readonly bool `json:"readonly,omitempty"`
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CreateTs uint64 `json:"create_ts,omitempty"`
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}
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type ControllerServer struct
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@ -184,21 +186,11 @@ func (cs *ControllerServer) CreateVolume(ctx context.Context, req *csi.CreateVol
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{
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if (strings.Index(err.Error(), "already exists") > 0)
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{
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stat, err := invokeCLI(ctxVars, []string{ "ls", "--json", volName })
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inodeCfg, err := invokeList(ctxVars, volName, true)
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if (err != nil)
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{
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return nil, err
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}
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var inodeCfg []InodeConfig
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err = json.Unmarshal(stat, &inodeCfg)
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "Invalid JSON in vitastor-cli ls: "+err.Error())
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}
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if (len(inodeCfg) == 0)
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{
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return nil, status.Error(codes.Internal, "vitastor-cli create said that image already exists, but ls can't find it")
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}
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if (inodeCfg[0].Size < uint64(volSize))
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{
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return nil, status.Error(codes.Internal, "image "+volName+" is already created, but size is less than expected")
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@ -230,15 +222,15 @@ func (cs *ControllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVol
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return nil, status.Error(codes.InvalidArgument, "request cannot be empty")
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}
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ctxVars := make(map[string]string)
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err := json.Unmarshal([]byte(req.VolumeId), &ctxVars)
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volVars := make(map[string]string)
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err := json.Unmarshal([]byte(req.VolumeId), &volVars)
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "volume ID not in JSON format")
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}
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volName := ctxVars["name"]
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volName := volVars["name"]
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ctxVars, _, _ = GetConnectionParams(ctxVars)
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ctxVars, _, _ := GetConnectionParams(volVars)
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_, err = invokeCLI(ctxVars, []string{ "rm", volName })
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if (err != nil)
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@ -342,8 +334,9 @@ func (cs *ControllerServer) ControllerGetCapabilities(ctx context.Context, req *
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for _, capability := range []csi.ControllerServiceCapability_RPC_Type{
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csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME,
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csi.ControllerServiceCapability_RPC_LIST_VOLUMES,
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csi.ControllerServiceCapability_RPC_EXPAND_VOLUME,
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csi.ControllerServiceCapability_RPC_CREATE_DELETE_SNAPSHOT,
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csi.ControllerServiceCapability_RPC_LIST_SNAPSHOTS,
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// TODO: csi.ControllerServiceCapability_RPC_CLONE_VOLUME,
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} {
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controllerServerCapabilities = append(controllerServerCapabilities, functionControllerServerCapabilities(capability))
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}
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@ -353,22 +346,165 @@ func (cs *ControllerServer) ControllerGetCapabilities(ctx context.Context, req *
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}, nil
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}
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func invokeList(ctxVars map[string]string, pattern string, expectExist bool) ([]InodeConfig, error)
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{
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stat, err := invokeCLI(ctxVars, []string{ "ls", "--json", pattern })
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if (err != nil)
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{
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return nil, err
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}
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var inodeCfg []InodeConfig
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err = json.Unmarshal(stat, &inodeCfg)
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "Invalid JSON in vitastor-cli ls: "+err.Error())
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}
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if (expectExist && len(inodeCfg) == 0)
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{
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return nil, status.Error(codes.Internal, "Can't find expected image "+pattern+" via vitastor-cli ls")
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}
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return inodeCfg, nil
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}
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// CreateSnapshot create snapshot of an existing PV
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func (cs *ControllerServer) CreateSnapshot(ctx context.Context, req *csi.CreateSnapshotRequest) (*csi.CreateSnapshotResponse, error)
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{
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return nil, status.Error(codes.Unimplemented, "")
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klog.Infof("received controller create snapshot request %+v", protosanitizer.StripSecrets(req))
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if (req == nil)
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{
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return nil, status.Errorf(codes.InvalidArgument, "request cannot be empty")
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}
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if (req.SourceVolumeId == "" || req.Name == "")
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{
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return nil, status.Error(codes.InvalidArgument, "source volume ID and snapshot name are required fields")
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}
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// snapshot name
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snapName := req.Name
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// req.VolumeId is an ugly json string in our case :)
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ctxVars := make(map[string]string)
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err := json.Unmarshal([]byte(req.SourceVolumeId), &ctxVars)
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "volume ID not in JSON format")
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}
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volName := ctxVars["name"]
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// Create image using vitastor-cli
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_, err = invokeCLI(ctxVars, []string{ "create", "--snapshot", snapName, volName })
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if (err != nil && strings.Index(err.Error(), "already exists") <= 0)
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{
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return nil, err
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}
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// Check created snapshot
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inodeCfg, err := invokeList(ctxVars, volName+"@"+snapName, true)
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if (err != nil)
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{
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return nil, err
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}
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// Use ugly JSON snapshot ID again, DeleteSnapshot doesn't have context :-(
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ctxVars["snapshot"] = snapName
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snapIdJson, _ := json.Marshal(ctxVars)
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return &csi.CreateSnapshotResponse{
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Snapshot: &csi.Snapshot{
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SizeBytes: int64(inodeCfg[0].Size),
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SnapshotId: string(snapIdJson),
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SourceVolumeId: req.SourceVolumeId,
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CreationTime: ×tamppb.Timestamp{ Seconds: int64(inodeCfg[0].CreateTs) },
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ReadyToUse: true,
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},
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}, nil
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}
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// DeleteSnapshot delete provided snapshot of a PV
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func (cs *ControllerServer) DeleteSnapshot(ctx context.Context, req *csi.DeleteSnapshotRequest) (*csi.DeleteSnapshotResponse, error)
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{
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return nil, status.Error(codes.Unimplemented, "")
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klog.Infof("received controller delete snapshot request %+v", protosanitizer.StripSecrets(req))
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if (req == nil)
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{
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return nil, status.Errorf(codes.InvalidArgument, "request cannot be empty")
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}
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if (req.SnapshotId == "")
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{
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return nil, status.Error(codes.InvalidArgument, "snapshot ID is a required field")
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}
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volVars := make(map[string]string)
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err := json.Unmarshal([]byte(req.SnapshotId), &volVars)
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "snapshot ID not in JSON format")
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}
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volName := volVars["name"]
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snapName := volVars["snapshot"]
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ctxVars, _, _ := GetConnectionParams(volVars)
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_, err = invokeCLI(ctxVars, []string{ "rm", volName+"@"+snapName })
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if (err != nil)
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{
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return nil, err
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}
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return &csi.DeleteSnapshotResponse{}, nil
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}
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// ListSnapshots list the snapshots of a PV
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func (cs *ControllerServer) ListSnapshots(ctx context.Context, req *csi.ListSnapshotsRequest) (*csi.ListSnapshotsResponse, error)
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{
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return nil, status.Error(codes.Unimplemented, "")
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klog.Infof("received controller list snapshots request %+v", protosanitizer.StripSecrets(req))
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if (req == nil)
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{
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return nil, status.Error(codes.InvalidArgument, "request cannot be empty")
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}
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volVars := make(map[string]string)
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err := json.Unmarshal([]byte(req.SourceVolumeId), &volVars)
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "volume ID not in JSON format")
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}
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volName := volVars["name"]
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ctxVars, _, _ := GetConnectionParams(volVars)
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inodeCfg, err := invokeList(ctxVars, volName+"@*", false)
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if (err != nil)
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{
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return nil, err
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}
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resp := &csi.ListSnapshotsResponse{}
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for _, ino := range inodeCfg
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{
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snapName := ino.Name[len(volName)+1:]
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if (len(req.StartingToken) > 0 && snapName < req.StartingToken)
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{
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}
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else if (req.MaxEntries == 0 || len(resp.Entries) < int(req.MaxEntries))
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{
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volVars["snapshot"] = snapName
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snapIdJson, _ := json.Marshal(volVars)
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resp.Entries = append(resp.Entries, &csi.ListSnapshotsResponse_Entry{
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Snapshot: &csi.Snapshot{
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SizeBytes: int64(ino.Size),
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SnapshotId: string(snapIdJson),
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SourceVolumeId: req.SourceVolumeId,
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CreationTime: ×tamppb.Timestamp{ Seconds: int64(ino.CreateTs) },
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ReadyToUse: true,
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},
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})
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}
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else
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{
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resp.NextToken = snapName
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break
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}
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}
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return resp, nil
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}
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// ControllerExpandVolume resizes a volume
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