Initial commit

pkg/dsm/common/config.go

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2021 Synology Inc.
+ */
+
+package common
+
+import (
+	"io/ioutil"
+	"gopkg.in/yaml.v2"
+	log "github.com/sirupsen/logrus"
+)
+
+type ClientInfo struct {
+	Host            string `yaml:"host"`
+	Port            int    `yaml:"port"`
+	Https           bool   `yaml:"https"`
+	Username        string `yaml:"username"`
+	Password        string `yaml:"password"`
+}
+
+type SynoInfo struct {
+	Clients []ClientInfo `yaml:"clients"`
+}
+
+func LoadConfig(configPath string) (*SynoInfo, error) {
+	file, err := ioutil.ReadFile(configPath)
+	if err != nil {
+		log.Errorf("Unable to open config file: %v", err)
+		return nil, err
+	}
+
+	info := SynoInfo{}
+	err = yaml.Unmarshal(file, &info)
+	if err != nil {
+		log.Errorf("Failed to parse config: %v", err)
+		return nil, err
+	}
+
+	return &info, nil
+}

pkg/dsm/service/dsm.go

@@ -0,0 +1,624 @@
+/*
+ * Copyright 2021 Synology Inc.
+ */
+
+package service
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/cenkalti/backoff/v4"
+	log "github.com/sirupsen/logrus"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"strconv"
+	"time"
+	"strings"
+	"github.com/SynologyOpenSource/synology-csi/pkg/dsm/common"
+	"github.com/SynologyOpenSource/synology-csi/pkg/dsm/webapi"
+	"github.com/SynologyOpenSource/synology-csi/pkg/models"
+	"github.com/SynologyOpenSource/synology-csi/pkg/utils"
+)
+
+type DsmService struct {
+	dsms map[string]*webapi.DSM
+}
+
+func NewDsmService() *DsmService {
+	return &DsmService{
+		dsms: make(map[string]*webapi.DSM),
+	}
+}
+
+func (service *DsmService) AddDsm(client common.ClientInfo) error {
+	// TODO: use sn or other identifiers as key
+	if _, ok := service.dsms[client.Host]; ok {
+		log.Infof("Adding DSM [%s] already present.", client.Host)
+		return nil
+	}
+
+	dsm := &webapi.DSM{
+		Ip:       client.Host,
+		Port:     client.Port,
+		Username: client.Username,
+		Password: client.Password,
+		Https:    client.Https,
+	}
+	err := dsm.Login()
+	if err != nil {
+		return fmt.Errorf("Failed to login to DSM: [%s]. err: %v", dsm.Ip, err)
+	}
+	service.dsms[dsm.Ip] = dsm
+	log.Infof("Add DSM [%s].", dsm.Ip)
+	return nil
+}
+
+func (service *DsmService) RemoveAllDsms() {
+	for _, dsm := range service.dsms {
+		log.Infof("Going to logout DSM [%s]", dsm.Ip)
+
+		for i := 0; i < 3; i++ {
+			err := dsm.Logout()
+			if err == nil {
+				break
+			}
+			log.Debugf("Retry to logout DSM [%s], retry: %d", dsm.Ip, i)
+		}
+	}
+	return
+}
+
+func (service *DsmService) GetDsm(ip string) (*webapi.DSM, error) {
+	dsm, ok := service.dsms[ip]
+	if !ok {
+		return nil, fmt.Errorf("Requested dsm [%s] does not exist", ip)
+	}
+	return dsm, nil
+}
+
+func (service *DsmService) GetDsmsCount() int {
+	return len(service.dsms)
+}
+
+func (service *DsmService) ListDsmVolumes(ip string) ([]webapi.VolInfo, error) {
+	var allVolInfos []webapi.VolInfo
+
+	for _, dsm := range service.dsms {
+		if ip != "" && dsm.Ip != ip {
+			continue
+		}
+
+		volInfos, err := dsm.VolumeList()
+		if err != nil {
+			continue
+		}
+
+		allVolInfos = append(allVolInfos, volInfos...)
+	}
+
+	return allVolInfos, nil
+}
+
+func (service *DsmService) getFirstAvailableVolume(dsm *webapi.DSM, sizeInBytes int64) (webapi.VolInfo, error) {
+	volInfos, err := dsm.VolumeList()
+	if err != nil {
+		return webapi.VolInfo{}, err
+	}
+
+	for _, volInfo := range volInfos {
+		free, err := strconv.ParseInt(volInfo.Free, 10, 64)
+		if err != nil {
+			return webapi.VolInfo{}, err
+		}
+		if free < utils.UNIT_GB {
+			continue
+		}
+		if volInfo.Status == "crashed" || volInfo.Status == "read_only" || volInfo.Status == "deleting" || free <= sizeInBytes {
+			continue
+		}
+		// ignore esata disk
+		if volInfo.Container == "external" && volInfo.Location == "sata" {
+			continue
+		}
+		return volInfo, nil
+	}
+	return webapi.VolInfo{}, fmt.Errorf("Cannot find any available volume")
+}
+
+func getLunTypeByInputParams(lunType string, isThin bool, locationFsType string) (string, error) {
+	log.Debugf("Input lunType: %v, isThin: %v, locationFsType: %v", lunType, isThin, locationFsType)
+	if lunType != "" {
+		return lunType, nil
+	}
+
+	if locationFsType == models.FsTypeExt4 {
+		if isThin {
+			return models.LunTypeAdv, nil // ADV
+		} else {
+			return models.LunTypeFile, nil // FILE
+		}
+	} else if locationFsType == models.FsTypeBtrfs {
+		if isThin {
+			return models.LunTypeBlun, nil // BLUN
+		} else {
+			return models.LunTypeBlunThick, nil // BLUN_THICK
+		}
+	}
+
+	return "", fmt.Errorf("Unknown volume fs type: %s", locationFsType)
+}
+
+func (service *DsmService) createMappingTarget(dsm *webapi.DSM, spec *models.CreateK8sVolumeSpec, lunUuid string) error {
+	dsmInfo, err := dsm.DsmInfoGet()
+
+	if err != nil {
+		return status.Errorf(codes.Internal, fmt.Sprintf("Failed to get DSM[%s] info", dsm.Ip));
+	}
+
+	genTargetIqn := func() string {
+		iqn := models.IqnPrefix + fmt.Sprintf("%s.%s", dsmInfo.Hostname, spec.K8sVolumeName)
+		iqn = strings.ReplaceAll(iqn, "_", "-")
+		iqn = strings.ReplaceAll(iqn, "+", "p")
+
+		if len(iqn) > models.MaxIqnLen {
+			return iqn[:models.MaxIqnLen]
+		}
+		return iqn
+	}
+	targetSpec := webapi.TargetCreateSpec{
+		Name: spec.TargetName,
+		Iqn: genTargetIqn(),
+	}
+
+	log.Debugf("TargetCreate spec: %v", targetSpec)
+	targetId, err := dsm.TargetCreate(targetSpec)
+
+	if err != nil && !errors.Is(err, utils.AlreadyExistError("")) {
+		return status.Errorf(codes.Internal, fmt.Sprintf("Failed to create target with spec: %v, err: %v", targetSpec, err))
+	}
+
+	if targetInfo, err := dsm.TargetGet(targetSpec.Name); err != nil {
+		return status.Errorf(codes.Internal, fmt.Sprintf("Failed to get target with spec: %v, err: %v", targetSpec, err))
+	} else {
+		targetId = strconv.Itoa(targetInfo.TargetId);
+	}
+
+	if spec.MultipleSession == true {
+		if err := dsm.TargetSet(targetId, 0); err != nil {
+			return status.Errorf(codes.Internal, fmt.Sprintf("Failed to set target [%s] max session, err: %v", spec.TargetName, err))
+		}
+	}
+
+	err = dsm.LunMapTarget([]string{targetId}, lunUuid)
+	if err != nil {
+		return status.Errorf(codes.Internal, fmt.Sprintf("Failed to map target [%s] to lun [%s], err: %v", spec.TargetName, lunUuid, err))
+	}
+
+	return nil
+}
+
+func (service *DsmService) createVolumeByDsm(dsm *webapi.DSM, spec *models.CreateK8sVolumeSpec) (webapi.LunInfo, error) {
+	// 1. Find a available location
+	if spec.Location == "" {
+		vol, err := service.getFirstAvailableVolume(dsm, spec.Size)
+		if err != nil {
+			return webapi.LunInfo{},
+				status.Errorf(codes.Internal, fmt.Sprintf("Failed to get available location, err: %v", err))
+		}
+		spec.Location = vol.Path
+	}
+
+	// 2. Check if location exists
+	dsmVolInfo, err := dsm.VolumeGet(spec.Location)
+	if err != nil {
+		return webapi.LunInfo{},
+			status.Errorf(codes.InvalidArgument, fmt.Sprintf("Unable to find location %s", spec.Location))
+	}
+
+	lunType, err := getLunTypeByInputParams(spec.Type, spec.ThinProvisioning, dsmVolInfo.FsType)
+	if err != nil {
+		return webapi.LunInfo{},
+			status.Errorf(codes.InvalidArgument, fmt.Sprintf("Unknown volume fs type: %s, location: %s", dsmVolInfo.FsType, spec.Location))
+	}
+
+	// 3. Create LUN
+	lunSpec := webapi.LunCreateSpec{
+		Name:     spec.LunName,
+		Location: spec.Location,
+		Size:     spec.Size,
+		Type:     lunType,
+	}
+
+	log.Debugf("LunCreate spec: %v", lunSpec)
+	_, err = dsm.LunCreate(lunSpec)
+
+	if err != nil && !errors.Is(err, utils.AlreadyExistError("")) {
+		return webapi.LunInfo{},
+			status.Errorf(codes.Internal, fmt.Sprintf("Failed to create Volume with name: %s, err: %v", spec.K8sVolumeName, err))
+	}
+
+	// No matter lun existed or not, Get Lun by name
+	lunInfo, err := dsm.LunGet(spec.LunName)
+	if err != nil {
+		return webapi.LunInfo{},
+			// discussion with log
+			status.Errorf(codes.Internal, fmt.Sprintf("Failed to get existed LUN with name: %s, err: %v", spec.LunName, err))
+	}
+
+	// 4. Create Target and Map to Lun
+	err = service.createMappingTarget(dsm, spec, lunInfo.Uuid)
+	if err != nil {
+		// FIXME need to delete lun and target
+		return webapi.LunInfo{},
+			status.Errorf(codes.Internal, fmt.Sprintf("Failed to create and map target, err: %v", err))
+	}
+
+	log.Debugf("[%s] CreateVolume Successfully. VolumeId: %s", dsm.Ip, lunInfo.Uuid);
+
+	return lunInfo, nil
+}
+
+func waitCloneFinished(dsm *webapi.DSM, lunName string) error {
+	cloneBackoff := backoff.NewExponentialBackOff()
+	cloneBackoff.InitialInterval = 1 * time.Second
+	cloneBackoff.Multiplier = 2
+	cloneBackoff.RandomizationFactor = 0.1
+	cloneBackoff.MaxElapsedTime = 20 * time.Second
+
+	checkFinished := func() error {
+		lunInfo, err := dsm.LunGet(lunName)
+		if err != nil {
+			return backoff.Permanent(fmt.Errorf("Failed to get existed LUN with name: %s, err: %v", lunName, err))
+		}
+
+		if lunInfo.IsActionLocked != false {
+			return fmt.Errorf("Clone not yet completed. Lun: %s", lunName)
+		}
+		return nil
+	}
+
+	cloneNotify := func(err error, duration time.Duration) {
+		log.Infof("Lun is being locked for lun clone, waiting %3.2f seconds .....", float64(duration.Seconds()))
+	}
+
+	if err := backoff.RetryNotify(checkFinished, cloneBackoff, cloneNotify); err != nil {
+		log.Errorf("Could not finish clone after %3.2f seconds. err: %v", float64(cloneBackoff.MaxElapsedTime.Seconds()), err)
+		return err
+	}
+
+	log.Debugf("Clone successfully. Lun: %v", lunName)
+	return nil
+}
+
+func (service *DsmService) createVolumeBySnapshot(dsm *webapi.DSM, spec *models.CreateK8sVolumeSpec, snapshotInfo webapi.SnapshotInfo) (webapi.LunInfo, error) {
+	if spec.Size != 0 && spec.Size != snapshotInfo.TotalSize {
+		return webapi.LunInfo{}, status.Errorf(codes.OutOfRange, "Lun size [%d] is not equal to snapshot size [%d]", spec.Size, snapshotInfo.TotalSize)
+	}
+
+	snapshotCloneSpec := webapi.SnapshotCloneSpec{
+		Name:            spec.LunName,
+		SrcLunUuid:      snapshotInfo.ParentUuid,
+		SrcSnapshotUuid: snapshotInfo.Uuid,
+	}
+
+	if _, err := dsm.SnapshotClone(snapshotCloneSpec); err != nil && !errors.Is(err, utils.AlreadyExistError("")) {
+		return webapi.LunInfo{},
+			status.Errorf(codes.Internal, fmt.Sprintf("Failed to create volume with source snapshot ID: %s, err: %v", snapshotInfo.Uuid, err))
+	}
+
+	if err := waitCloneFinished(dsm, spec.LunName); err != nil {
+		return webapi.LunInfo{}, status.Errorf(codes.Internal, err.Error())
+	}
+
+	lunInfo, err := dsm.LunGet(spec.LunName)
+	if err != nil {
+		return webapi.LunInfo{},
+			status.Errorf(codes.Internal, fmt.Sprintf("Failed to get existed LUN with name: %s, err: %v", spec.LunName, err))
+	}
+
+	err = service.createMappingTarget(dsm, spec, lunInfo.Uuid)
+	if err != nil {
+		// FIXME need to delete lun and target
+		return webapi.LunInfo{},
+			status.Errorf(codes.Internal, fmt.Sprintf("Failed to create and map target, err: %v", err))
+	}
+
+	log.Debugf("[%s] createVolumeBySnapshot Successfully. VolumeId: %s", dsm.Ip, lunInfo.Uuid);
+
+	return lunInfo, nil
+}
+
+func (service *DsmService) createVolumeByVolume(dsm *webapi.DSM, spec *models.CreateK8sVolumeSpec, srcLunInfo webapi.LunInfo) (webapi.LunInfo, error) {
+	if spec.Size != 0 && spec.Size != int64(srcLunInfo.Size) {
+		return webapi.LunInfo{}, status.Errorf(codes.OutOfRange, "Lun size [%d] is not equal to src lun size [%d]", spec.Size, srcLunInfo.Size)
+	}
+
+	if spec.Location == "" {
+		spec.Location = srcLunInfo.Location
+	}
+
+	lunCloneSpec := webapi.LunCloneSpec{
+		Name:            spec.LunName,
+		SrcLunUuid:      srcLunInfo.Uuid,
+		Location:        spec.Location,
+	}
+
+	if _, err := dsm.LunClone(lunCloneSpec); err != nil && !errors.Is(err, utils.AlreadyExistError("")) {
+		return webapi.LunInfo{},
+			status.Errorf(codes.Internal, fmt.Sprintf("Failed to create volume with source volume ID: %s, err: %v", srcLunInfo.Uuid, err))
+	}
+
+	if err := waitCloneFinished(dsm, spec.LunName); err != nil {
+		return webapi.LunInfo{}, status.Errorf(codes.Internal, err.Error())
+	}
+
+	lunInfo, err := dsm.LunGet(spec.LunName)
+	if err != nil {
+		return webapi.LunInfo{},
+			status.Errorf(codes.Internal, fmt.Sprintf("Failed to get existed LUN with name: %s, err: %v", spec.LunName, err))
+	}
+
+	err = service.createMappingTarget(dsm, spec, lunInfo.Uuid)
+	if err != nil {
+		// FIXME need to delete lun and target
+		return webapi.LunInfo{},
+			status.Errorf(codes.Internal, fmt.Sprintf("Failed to create and map target, err: %v", err))
+	}
+
+	log.Debugf("[%s] createVolumeByVolume Successfully. VolumeId: %s", dsm.Ip, lunInfo.Uuid);
+
+	return lunInfo, nil
+}
+
+func (service *DsmService) CreateVolume(spec *models.CreateK8sVolumeSpec) (webapi.LunInfo, string, error) {
+	if spec.SourceVolumeId != "" {
+		/* Create volume by exists volume (Clone) */
+		k8sVolume := service.GetVolume(spec.SourceVolumeId)
+		if k8sVolume == nil {
+			return webapi.LunInfo{}, "", status.Errorf(codes.NotFound, fmt.Sprintf("No such volume id: %s", spec.SourceVolumeId))
+		}
+
+		dsm, err := service.GetDsm(k8sVolume.DsmIp)
+		if err != nil {
+			return webapi.LunInfo{}, "", status.Errorf(codes.Internal, fmt.Sprintf("Failed to get DSM[%s]", k8sVolume.DsmIp))
+		}
+
+		lunInfo, err := service.createVolumeByVolume(dsm, spec, k8sVolume.Lun)
+		return lunInfo, dsm.Ip, err
+	} else if spec.SourceSnapshotId != "" {
+		/* Create volume by snapshot */
+		for _, dsm := range service.dsms {
+			snapshotInfo, err := dsm.SnapshotGet(spec.SourceSnapshotId)
+			if err != nil {
+				continue
+			}
+
+			lunInfo, err := service.createVolumeBySnapshot(dsm, spec, snapshotInfo)
+			return lunInfo, dsm.Ip, err
+		}
+		return webapi.LunInfo{}, "", status.Errorf(codes.NotFound, fmt.Sprintf("No such snapshot id: %s", spec.SourceSnapshotId))
+	} else if spec.DsmIp != "" {
+		/* Create volume by specific dsm ip */
+		dsm, err := service.GetDsm(spec.DsmIp)
+		if err != nil {
+			return webapi.LunInfo{}, "", status.Errorf(codes.Internal, fmt.Sprintf("%v", err))
+		}
+		lunInfo, err := service.createVolumeByDsm(dsm, spec)
+		return lunInfo, dsm.Ip, err
+	} else {
+		/* Find appropriate dsm to create volume */
+		for _, dsm := range service.dsms {
+			lunInfo, err := service.createVolumeByDsm(dsm, spec)
+			if err != nil {
+				log.Errorf("[%s] Failed to create Volume: %v", dsm.Ip, err)
+				continue
+			}
+			return lunInfo, dsm.Ip, nil
+		}
+		return webapi.LunInfo{}, "", status.Errorf(codes.Internal, fmt.Sprintf("Couldn't find any host available to create Volume"))
+	}
+}
+
+func (service *DsmService) DeleteVolume(volumeId string) error {
+	k8sVolume := service.GetVolume(volumeId)
+	if k8sVolume == nil {
+		log.Infof("Skip delete volume[%s] that is no exist", volumeId)
+		return nil
+	}
+
+	lun, target := k8sVolume.Lun, k8sVolume.Target
+	dsm, err := service.GetDsm(k8sVolume.DsmIp)
+
+	if err != nil {
+		return status.Errorf(codes.Internal, fmt.Sprintf("Failed to get DSM[%s]", k8sVolume.DsmIp))
+	}
+
+	if err := dsm.LunDelete(lun.Uuid); err != nil {
+		return err
+	}
+
+	if len(target.MappedLuns) != 1 {
+		log.Infof("Skip deletes target[%s] that was mapped with lun. DSM[%s]", target.Name, dsm.Ip)
+		return nil
+	}
+
+	if err := dsm.TargetDelete(strconv.Itoa(target.TargetId)); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (service *DsmService) listVolumesByDsm(dsm *webapi.DSM, infos *[]*models.ListK8sVolumeRespSpec) {
+	targetInfos, err := dsm.TargetList()
+	if err != nil {
+		log.Errorf("[%s] Failed to list targets: %v", dsm.Ip, err)
+	}
+
+	for _, target := range targetInfos {
+		// TODO: use target.ConnectedSessions to filter targets
+		for _, mapping := range target.MappedLuns {
+			lun, err := dsm.LunGet(mapping.LunUuid)
+			if err != nil {
+				log.Errorf("[%s] Failed to get LUN(%s): %v", dsm.Ip, mapping.LunUuid, err)
+			}
+
+			if !strings.HasPrefix(lun.Name, models.LunPrefix) {
+				continue
+			}
+
+			*infos = append(*infos, &models.ListK8sVolumeRespSpec{
+				DsmIp:  dsm.Ip,
+				Target: target,
+				Lun:    lun,
+			})
+		}
+	}
+	return
+}
+
+func (service *DsmService) ListVolumes() []*models.ListK8sVolumeRespSpec {
+	var infos []*models.ListK8sVolumeRespSpec
+
+	for _, dsm := range service.dsms {
+		service.listVolumesByDsm(dsm, &infos)
+	}
+
+	return infos
+}
+
+func (service *DsmService) GetVolume(lunUuid string) *models.ListK8sVolumeRespSpec {
+	volumes := service.ListVolumes()
+
+	for _, volume := range volumes {
+		if volume.Lun.Uuid == lunUuid {
+			return volume
+		}
+	}
+
+	return nil
+}
+
+func (service *DsmService) ExpandLun(lunUuid string, newSize int64) error {
+	k8sVolume := service.GetVolume(lunUuid);
+	if k8sVolume == nil {
+		return status.Errorf(codes.InvalidArgument, fmt.Sprintf("Can't find volume[%s].", lunUuid))
+	}
+
+	if int64(k8sVolume.Lun.Size) > newSize {
+		return status.Errorf(codes.InvalidArgument,
+			fmt.Sprintf("Failed to expand volume[%s], because expand size[%d] bigger than before[%d].",
+				lunUuid, newSize, k8sVolume.Lun.Size))
+	}
+
+	spec := webapi.LunUpdateSpec{
+		Uuid: lunUuid,
+		NewSize: uint64(newSize),
+	}
+
+	dsm, err := service.GetDsm(k8sVolume.DsmIp)
+	if err != nil {
+		return status.Errorf(codes.Internal, fmt.Sprintf("Failed to get DSM[%s]", k8sVolume.DsmIp))
+	}
+
+	if err := dsm.LunUpdate(spec); err != nil {
+		return status.Errorf(codes.InvalidArgument,
+			fmt.Sprintf("Failed to expand volume[%s]. err: %v", lunUuid, err))
+	}
+
+	return nil
+}
+
+func (service *DsmService) CreateSnapshot(spec *models.CreateK8sVolumeSnapshotSpec) (string, error) {
+	k8sVolume := service.GetVolume(spec.K8sVolumeId);
+	if k8sVolume == nil {
+		return "", status.Errorf(codes.NotFound, fmt.Sprintf("Can't find volume[%s].", spec.K8sVolumeId))
+	}
+
+	snapshotSpec := webapi.SnapshotCreateSpec{
+		Name:    spec.SnapshotName,
+		LunUuid: spec.K8sVolumeId,
+		Description: spec.Description,
+		TakenBy: spec.TakenBy,
+		IsLocked: spec.IsLocked,
+	}
+
+	dsm, err := service.GetDsm(k8sVolume.DsmIp)
+	if err != nil {
+		return "", status.Errorf(codes.InvalidArgument, fmt.Sprintf("Failed to get dsm: %v", err))
+	}
+
+	snapshotUuid, err := dsm.SnapshotCreate(snapshotSpec)
+	if err != nil {
+		return "", err
+	}
+
+	return snapshotUuid, nil
+}
+
+func (service *DsmService) DeleteSnapshot(snapshotUuid string) error {
+	for _, dsm := range service.dsms {
+		_, err := dsm.SnapshotGet(snapshotUuid)
+		if err != nil {
+			continue
+		}
+
+		err = dsm.SnapshotDelete(snapshotUuid)
+		if err != nil {
+			return status.Errorf(codes.Internal, fmt.Sprintf("Failed to delete snapshot [%s]. err: %v", snapshotUuid, err))
+		}
+
+		return nil
+	}
+
+	return nil
+}
+
+func (service *DsmService) ListAllSnapshots() ([]webapi.SnapshotInfo, error) {
+	var allInfos []webapi.SnapshotInfo
+
+	for _, dsm := range service.dsms {
+		infos, err := dsm.SnapshotList("")
+		if err != nil {
+			continue
+		}
+
+		allInfos = append(allInfos, infos...)
+	}
+
+	return allInfos, nil
+}
+
+func (service *DsmService) ListSnapshots(lunUuid string) ([]webapi.SnapshotInfo, error) {
+	k8sVolume := service.GetVolume(lunUuid);
+	if k8sVolume == nil {
+		return []webapi.SnapshotInfo{}, nil // return empty when the volume does not exist
+	}
+
+	dsm, err := service.GetDsm(k8sVolume.DsmIp)
+	if err != nil {
+		return nil, status.Errorf(codes.InvalidArgument, fmt.Sprintf("Failed to get dsm: %v", err))
+	}
+
+	infos, err := dsm.SnapshotList(lunUuid)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal,
+			fmt.Sprintf("Failed to list snapshot on lun [%s]. err: %v", lunUuid, err))
+	}
+
+	return infos, nil
+}
+
+func (service *DsmService) GetSnapshot(snapshotUuid string) (webapi.SnapshotInfo, error) {
+	for _, dsm := range service.dsms {
+		info, err := dsm.SnapshotGet(snapshotUuid)
+		if err != nil {
+			continue
+		}
+
+		return info, nil
+	}
+
+	return webapi.SnapshotInfo{}, status.Errorf(codes.Internal, fmt.Sprintf("No such snapshot uuid [%s]", snapshotUuid))
+}

pkg/dsm/webapi/dsmwebapi.go

@@ -0,0 +1,208 @@
+/*
+ * Copyright 2021 Synology Inc.
+ */
+
+package webapi
+
+import (
+	"crypto/tls"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	log "github.com/sirupsen/logrus"
+	"net/http"
+	"net/url"
+	"regexp"
+	"github.com/SynologyOpenSource/synology-csi/pkg/logger"
+)
+
+type DSM struct {
+	Ip       string
+	Port     int
+	Username string
+	Password string
+	Sid      string
+	Https    bool
+}
+
+type errData struct {
+	Code int `json:"code"`
+}
+
+type dsmApiResp struct {
+	Success bool    `json:"success"`
+	Err     errData `json:"error"`
+}
+
+type Response struct {
+	StatusCode int
+	ErrorCode  int
+	Success    bool
+	Data       interface{}
+}
+
+func (dsm *DSM) sendRequest(data string, apiTemplate interface{}, params url.Values, cgiPath string) (Response, error) {
+	resp, err := dsm.sendRequestWithoutConnectionCheck(data, apiTemplate, params, cgiPath)
+	if err != nil && resp.ErrorCode == 119 { // WEBAPI_ERR_SID_NOT_FOUND
+		// Re-login
+		if err := dsm.Login(); err != nil {
+			return Response{}, fmt.Errorf("Failed to re-login to DSM: [%s]. err: %v", dsm.Ip, err)
+		}
+		log.Info("Re-login succeeded.")
+		return dsm.sendRequestWithoutConnectionCheck(data, apiTemplate, params, cgiPath);
+	}
+
+	return resp, err
+}
+
+func (dsm *DSM) sendRequestWithoutConnectionCheck(data string, apiTemplate interface{}, params url.Values, cgiPath string) (Response, error) {
+	client := &http.Client{}
+	var req *http.Request
+	var err error
+	var cgiUrl string
+
+	// Ex: http://10.12.12.14:5000/webapi/auth.cgi
+	if dsm.Https {
+		// TODO: input CA certificate and fill in tls config
+		// Skip Verify when https
+		tr := &http.Transport{
+			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+		}
+		client = &http.Client{Transport: tr}
+		cgiUrl = fmt.Sprintf("https://%s:%d/%s", dsm.Ip, dsm.Port, cgiPath)
+	} else {
+		cgiUrl = fmt.Sprintf("http://%s:%d/%s", dsm.Ip, dsm.Port, cgiPath)
+	}
+
+	baseUrl, err := url.Parse(cgiUrl)
+	if err != nil {
+		return Response{}, err
+	}
+
+	baseUrl.RawQuery = params.Encode()
+
+	if logger.WebapiDebug {
+		log.Debugln(baseUrl.RawQuery)
+	}
+
+	if data != "" {
+		req, err = http.NewRequest("POST", baseUrl.String(), nil)
+	} else {
+		req, err = http.NewRequest("GET", baseUrl.String(), nil)
+	}
+
+	if dsm.Sid != "" {
+		cookie := http.Cookie{Name: "id", Value: dsm.Sid}
+		req.AddCookie(&cookie)
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return Response{}, err
+	}
+	defer resp.Body.Close()
+
+	// For debug print text body
+	var bodyText []byte
+	if logger.WebapiDebug {
+		bodyText, err = ioutil.ReadAll(resp.Body)
+		if err != nil {
+			return Response{}, err
+		}
+		s := string(bodyText)
+		log.Debugln(s)
+	}
+
+	if resp.StatusCode != 200 && resp.StatusCode != 302 {
+		return Response{}, fmt.Errorf("Bad response status code: %d", resp.StatusCode)
+	}
+
+	// Strip data json data from response
+	type envelop struct {
+		dsmApiResp
+		Data json.RawMessage `json:"data"`
+	}
+
+	e := envelop{}
+	var outResp Response
+
+	if logger.WebapiDebug {
+		if err := json.Unmarshal(bodyText, &e); err != nil {
+			return Response{}, err
+		}
+	} else {
+		decoder := json.NewDecoder(resp.Body)
+
+		if err := decoder.Decode(&e); err != nil {
+			return Response{}, err
+		}
+	}
+	outResp.Success = e.Success
+	outResp.ErrorCode = e.Err.Code
+	outResp.StatusCode = resp.StatusCode
+
+	if !e.Success {
+		return outResp, fmt.Errorf("DSM Api error. Error code:%d", outResp.ErrorCode)
+	}
+
+	if e.Data != nil {
+		if err := json.Unmarshal(e.Data, apiTemplate); err != nil {
+			return Response{}, err
+		}
+	}
+
+	outResp.Data = apiTemplate
+
+	if err != nil {
+		return Response{}, err
+	}
+
+	return outResp, nil
+}
+
+// Login by given user name and password
+func (dsm *DSM) Login() error {
+	params := url.Values{}
+	params.Add("api", "SYNO.API.Auth")
+	params.Add("method", "login")
+	params.Add("version", "3")
+	params.Add("account", dsm.Username)
+	params.Add("passwd", dsm.Password)
+	params.Add("format", "sid")
+
+	type LoginResp struct {
+		Sid string `json:"sid"`
+	}
+
+	resp, err := dsm.sendRequestWithoutConnectionCheck("", &LoginResp{}, params, "webapi/auth.cgi")
+	if err != nil {
+		r, _ := regexp.Compile("passwd=.*&")
+		temp := r.ReplaceAllString(err.Error(), "")
+
+		return fmt.Errorf("%s", temp)
+	}
+
+	loginResp, ok := resp.Data.(*LoginResp)
+	if !ok {
+		return fmt.Errorf("Failed to assert response to %T", &LoginResp{})
+	}
+	dsm.Sid = loginResp.Sid
+
+	return nil
+}
+
+// Logout on current IP and reset the synoToken
+func (dsm *DSM) Logout() error {
+	params := url.Values{}
+	params.Add("api", "SYNO.API.Auth")
+	params.Add("method", "logout")
+	params.Add("version", "1")
+
+	_, err := dsm.sendRequestWithoutConnectionCheck("", &struct{}{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return err
+	}
+	dsm.Sid = ""
+
+	return nil
+}

pkg/dsm/webapi/iscsi.go

@@ -0,0 +1,500 @@
+// Copyright 2021 Synology Inc.
+
+package webapi
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/url"
+	"strconv"
+	"strings"
+	log "github.com/sirupsen/logrus"
+	"github.com/SynologyOpenSource/synology-csi/pkg/logger"
+	"github.com/SynologyOpenSource/synology-csi/pkg/utils"
+)
+
+type LunInfo struct {
+	Name             string `json:"name"`
+	Uuid             string `json:"uuid"`
+	LunType          int    `json:"type"`
+	Location         string `json:"location"`
+	Size             uint64 `json:"size"`
+	Used             uint64 `json:"allocated_size"`
+	Status           string `json:"status"`
+	FlashcacheStatus string `json:"flashcache_status"`
+	IsActionLocked   bool   `json:"is_action_locked"`
+}
+
+type MappedLun struct {
+	LunUuid      string `json:"lun_uuid"`
+	MappingIndex int    `json:"mapping_index"`
+}
+
+type ConncetedSession struct {
+	Iqn string `json:"iqn"`
+	Ip  string `json:"ip"`
+}
+
+type NetworkPortal struct {
+	ControllerId  int    `json:"controller_id"`
+	InterfaceName string `json:"interface_name"`
+}
+
+type TargetInfo struct {
+	Name              string             `json:"name"`
+	Iqn               string             `json:"iqn"`
+	Status            string             `json:"status"`
+	MaxSessions       int                `json:"max_sessions"`
+	MappedLuns        []MappedLun        `json:"mapped_luns"`
+	ConnectedSessions []ConncetedSession `json:"connected_sessions"`
+	NetworkPortals    []NetworkPortal    `json:"network_portals"`
+	TargetId          int                `json:"target_id"`
+}
+
+type SnapshotInfo struct {
+	Name              string             `json:"name"`
+	Uuid              string             `json:"uuid"`
+	ParentUuid        string             `json:"parent_uuid"`
+	Status            string             `json:"status"`
+	TotalSize         int64              `json:"total_size"`
+	CreateTime        int64              `json:"create_time"`
+}
+
+type LunDevAttrib struct {
+	DevAttrib string `json:"dev_attrib"`
+	Enable    int    `json:"enable"`
+}
+
+type LunCreateSpec struct {
+	Name       string
+	Location   string
+	Size       int64
+	Type       string
+	DevAttribs []LunDevAttrib
+}
+
+type LunUpdateSpec struct {
+	Uuid    string
+	NewSize uint64
+}
+
+type LunCloneSpec struct {
+	Name            string
+	SrcLunUuid      string
+	Location        string
+}
+
+type TargetCreateSpec struct {
+	Name string
+	Iqn  string
+}
+
+type SnapshotCreateSpec struct {
+	Name        string
+	LunUuid     string
+	Description string
+	TakenBy     string
+	IsLocked    bool
+}
+
+type SnapshotCloneSpec struct {
+	Name            string
+	SrcLunUuid      string
+	SrcSnapshotUuid string
+}
+
+func errCodeMapping(errCode int, oriErr error) error {
+	switch errCode {
+	case 18990002: // Out of free space
+		return utils.OutOfFreeSpaceError("")
+	case 18990538: // Duplicated LUN name
+		return utils.AlreadyExistError("")
+	case 18990541:
+		return utils.LunReachMaxCountError("")
+	case 18990542:
+		return utils.TargetReachMaxCountError("")
+	case 18990744: // Duplicated Target name
+		return utils.AlreadyExistError("")
+	case 18990532:
+		return utils.NoSuchSnapshotError("")
+	case 18990500:
+		return utils.BadLunTypeError("")
+	case 18990543:
+		return utils.SnapshotReachMaxCountError("")
+	}
+
+	if errCode > 18990000 {
+		return utils.IscsiDefaultError("")
+	}
+	return oriErr
+}
+
+func (dsm *DSM) LunList() ([]LunInfo, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.LUN")
+	params.Add("method", "list")
+	params.Add("version", "1")
+	params.Add("types", "[\"BLOCK\", \"FILE\", \"THIN\", \"ADV\", \"SINK\", \"CINDER\", \"CINDER_BLUN\", \"CINDER_BLUN_THICK\", \"BLUN\", \"BLUN_THICK\", \"BLUN_SINK\", \"BLUN_THICK_SINK\"]")
+	params.Add("additional", "[\"allocated_size\",\"status\",\"flashcache_status\", \"is_action_locked\"]")
+
+	type LunInfos struct {
+		Luns []LunInfo `json:"luns"`
+	}
+
+	resp, err := dsm.sendRequest("", &LunInfos{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return nil, err
+	}
+
+	lunInfos, ok := resp.Data.(*LunInfos)
+	if !ok {
+		return nil, fmt.Errorf("Failed to assert response to %T", &LunInfos{})
+	}
+	return lunInfos.Luns, nil
+}
+
+func (dsm *DSM) LunCreate(spec LunCreateSpec) (string, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.LUN")
+	params.Add("method", "create")
+	params.Add("version", "1")
+	params.Add("name", strconv.Quote(spec.Name))
+	params.Add("size", strconv.FormatInt(int64(spec.Size), 10))
+	params.Add("type", spec.Type)
+	params.Add("location", spec.Location)
+
+	js, err := json.Marshal(spec.DevAttribs)
+	if err != nil {
+		return "", err
+	}
+	params.Add("dev_attribs", string(js))
+
+	type LunCreateResp struct {
+		Uuid string `json:"uuid"`
+	}
+
+	resp, err := dsm.sendRequest("", &LunCreateResp{}, params, "webapi/entry.cgi")
+	err = errCodeMapping(resp.ErrorCode, err)
+	if err != nil {
+		return "", err
+	}
+
+	lunResp, ok := resp.Data.(*LunCreateResp)
+	if !ok {
+		return "", fmt.Errorf("Failed to assert response to %T", &LunCreateResp{})
+	}
+
+	return lunResp.Uuid, nil
+}
+
+func (dsm *DSM) LunUpdate(spec LunUpdateSpec) error {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.LUN")
+	params.Add("method", "set")
+	params.Add("version", "1")
+	params.Add("uuid", strconv.Quote(spec.Uuid))
+	params.Add("new_size", strconv.FormatInt(int64(spec.NewSize), 10))
+
+	_, err := dsm.sendRequest("", &struct{}{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (dsm *DSM) LunGet(uuid string) (LunInfo, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.LUN")
+	params.Add("method", "get")
+	params.Add("version", "1")
+	params.Add("uuid", strconv.Quote(uuid))
+	params.Add("additional", "[\"allocated_size\",\"status\",\"flashcache_status\", \"is_action_locked\"]")
+
+	type Info struct {
+		Lun LunInfo `json:"lun"`
+	}
+	info := Info{}
+
+	_, err := dsm.sendRequest("", &info, params, "webapi/entry.cgi")
+	if err != nil {
+		return LunInfo{}, err
+	}
+
+	return info.Lun, nil
+}
+
+func (dsm *DSM) LunClone(spec LunCloneSpec) (string, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.LUN")
+	params.Add("method", "clone")
+	params.Add("version", "1")
+	params.Add("src_lun_uuid", strconv.Quote(spec.SrcLunUuid))
+	params.Add("dst_lun_name", strconv.Quote(spec.Name))
+	params.Add("dst_location", strconv.Quote(spec.Location))
+
+	type LunCloneResp struct {
+		Uuid string `json:"dst_lun_uuid"`
+	}
+
+	resp, err := dsm.sendRequest("", &LunCloneResp{}, params, "webapi/entry.cgi")
+	err = errCodeMapping(resp.ErrorCode, err)
+	if err != nil {
+		return "", err
+	}
+
+	cloneLunResp, ok := resp.Data.(*LunCloneResp)
+	if !ok {
+		return "", fmt.Errorf("Failed to assert response to %T", &LunCloneResp{})
+	}
+
+	return cloneLunResp.Uuid, nil
+}
+
+func (dsm *DSM) TargetList() ([]TargetInfo, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.Target")
+	params.Add("method", "list")
+	params.Add("version", "1")
+	params.Add("additional", "[\"mapped_lun\", \"connected_sessions\"]")
+
+	type TargetInfos struct {
+		Targets []TargetInfo `json:"targets"`
+	}
+
+	resp, err := dsm.sendRequest("", &TargetInfos{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return nil, err
+	}
+
+	trgInfos, ok := resp.Data.(*TargetInfos)
+	if !ok {
+		return nil, fmt.Errorf("Failed to assert response to %T", &TargetInfos{})
+	}
+	return trgInfos.Targets, nil
+}
+
+func (dsm *DSM) TargetGet(targetId string) (TargetInfo, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.Target")
+	params.Add("method", "get")
+	params.Add("version", "1")
+	params.Add("target_id", strconv.Quote(targetId))
+	params.Add("additional", "[\"mapped_lun\", \"connected_sessions\"]")
+
+	type Info struct {
+		Target TargetInfo `json:"target"`
+	}
+	info := Info{}
+
+	_, err := dsm.sendRequest("", &info, params, "webapi/entry.cgi")
+	if err != nil {
+		return TargetInfo{}, err
+	}
+
+	return info.Target, nil
+}
+
+// Enable muti session
+func (dsm *DSM) TargetSet(targetId string, maxSession int) error {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.Target")
+	params.Add("method", "set")
+	params.Add("version", "1")
+	params.Add("target_id", strconv.Quote(targetId))
+	params.Add("max_sessions", strconv.Itoa(maxSession))
+
+	_, err := dsm.sendRequest("", &struct{}{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (dsm *DSM) TargetCreate(spec TargetCreateSpec) (string, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.Target")
+	params.Add("method", "create")
+	params.Add("version", "1")
+	params.Add("name", spec.Name)
+	params.Add("auth_type", "0")
+	params.Add("iqn", spec.Iqn)
+
+	type TrgCreateResp struct {
+		TargetId int `json:"target_id"`
+	}
+
+	resp, err := dsm.sendRequest("", &TrgCreateResp{}, params, "webapi/entry.cgi")
+	err = errCodeMapping(resp.ErrorCode, err)
+	if err != nil {
+		return "", err
+	}
+
+	trgResp, ok := resp.Data.(*TrgCreateResp)
+	if !ok {
+		return "", fmt.Errorf("Failed to assert response to %T", &TrgCreateResp{})
+	}
+
+	return strconv.Itoa(trgResp.TargetId), nil
+}
+
+func (dsm *DSM) LunMapTarget(targetIds []string, lunUuid string) error {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.LUN")
+	params.Add("method", "map_target")
+	params.Add("version", "1")
+	params.Add("uuid", strconv.Quote(lunUuid))
+	params.Add("target_ids", fmt.Sprintf("[%s]", strings.Join(targetIds, ",")))
+
+	if logger.WebapiDebug {
+		log.Debugln(params)
+	}
+
+	_, err := dsm.sendRequest("", &struct{}{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (dsm *DSM) LunDelete(lunUuid string) error {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.LUN")
+	params.Add("method", "delete")
+	params.Add("version", "1")
+	params.Add("uuid", strconv.Quote(lunUuid))
+
+	_, err := dsm.sendRequest("", &struct{}{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (dsm *DSM) TargetDelete(targetName string) error {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.Target")
+	params.Add("method", "delete")
+	params.Add("version", "1")
+	params.Add("target_id", strconv.Quote(targetName))
+
+	_, err := dsm.sendRequest("", &struct{}{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (dsm *DSM) SnapshotCreate(spec SnapshotCreateSpec) (string, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.LUN")
+	params.Add("method", "take_snapshot")
+	params.Add("version", "1")
+	params.Add("src_lun_uuid", strconv.Quote(spec.LunUuid))
+	params.Add("snapshot_name", strconv.Quote(spec.Name))
+	params.Add("description", strconv.Quote(spec.Description))
+	params.Add("taken_by", strconv.Quote(spec.TakenBy))
+	params.Add("is_locked", strconv.FormatBool(spec.IsLocked))
+	params.Add("is_app_consistent", strconv.FormatBool(false))
+
+	type SnapshotCreateResp struct {
+		Uuid string `json:"snapshot_uuid"`
+	}
+
+	resp, err := dsm.sendRequest("", &SnapshotCreateResp{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return "", errCodeMapping(resp.ErrorCode, err)
+	}
+
+	snapshotResp, ok := resp.Data.(*SnapshotCreateResp)
+	if !ok {
+		return "", fmt.Errorf("Failed to assert response to %T", &SnapshotCreateResp{})
+	}
+
+	return snapshotResp.Uuid, nil
+}
+
+func (dsm *DSM) SnapshotDelete(snapshotUuid string) error {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.LUN")
+	params.Add("method", "delete_snapshot")
+	params.Add("version", "1")
+	params.Add("snapshot_uuid", strconv.Quote(snapshotUuid))
+
+	resp, err := dsm.sendRequest("", &struct{}{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return errCodeMapping(resp.ErrorCode, err)
+	}
+	return nil
+}
+
+func (dsm *DSM) SnapshotGet(snapshotUuid string) (SnapshotInfo, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.LUN")
+	params.Add("method", "get_snapshot")
+	params.Add("version", "1")
+	params.Add("snapshot_uuid", strconv.Quote(snapshotUuid))
+
+	type Info struct {
+		Snapshot SnapshotInfo `json:"snapshot"`
+	}
+	info := Info{}
+
+	resp, err := dsm.sendRequest("", &info, params, "webapi/entry.cgi")
+	if err != nil {
+		return SnapshotInfo{}, errCodeMapping(resp.ErrorCode, err)
+	}
+
+	return info.Snapshot, nil
+}
+
+func (dsm *DSM) SnapshotList(lunUuid string) ([]SnapshotInfo, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.LUN")
+	params.Add("method", "list_snapshot")
+	params.Add("version", "1")
+	params.Add("src_lun_uuid", strconv.Quote(lunUuid))
+
+	type Infos struct {
+		Snapshots []SnapshotInfo `json:"snapshots"`
+	}
+
+	resp, err := dsm.sendRequest("", &Infos{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return nil, errCodeMapping(resp.ErrorCode, err)
+	}
+
+	infos, ok := resp.Data.(*Infos)
+	if !ok {
+		return nil, fmt.Errorf("Failed to assert response to %T", &Infos{})
+	}
+
+	return infos.Snapshots, nil
+}
+
+func (dsm *DSM) SnapshotClone(spec SnapshotCloneSpec) (string, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.ISCSI.LUN")
+	params.Add("method", "clone_snapshot")
+	params.Add("version", "1")
+	params.Add("src_lun_uuid", strconv.Quote(spec.SrcLunUuid))
+	params.Add("snapshot_uuid", strconv.Quote(spec.SrcSnapshotUuid))
+	params.Add("cloned_lun_name", strconv.Quote(spec.Name))
+
+	type SnapshotCloneResp struct {
+		Uuid string `json:"cloned_lun_uuid"`
+	}
+
+	resp, err := dsm.sendRequest("", &SnapshotCloneResp{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return "", errCodeMapping(resp.ErrorCode, err)
+	}
+
+	snapshotCloneResp, ok := resp.Data.(*SnapshotCloneResp)
+	if !ok {
+		return "", fmt.Errorf("Failed to assert response to %T", &SnapshotCloneResp{})
+	}
+
+	return snapshotCloneResp.Uuid, nil
+}

pkg/dsm/webapi/share.go

@@ -0,0 +1,87 @@
+// Copyright 2021 Synology Inc.
+
+package webapi
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/url"
+	"strconv"
+)
+
+type ShareInfo struct {
+	Name                string `json:"name"`
+	VolPath             string `json:"vol_path"`
+	Desc                string `json:"desc"`
+	EnableShareCow      bool   `json:"enable_share_cow"`
+	EnableRecycleBin    bool   `json:"enable_recycle_bin"`
+	RecycleBinAdminOnly bool   `json:"recycle_bin_admin_only"`
+	Encryption          int    `json:"encryption"`
+}
+
+type ShareCreateSpec struct {
+	Name      string    `json:"name"`
+	ShareInfo ShareInfo `json:"shareinfo"`
+}
+
+func (dsm *DSM) ShareList() ([]ShareInfo, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.Share")
+	params.Add("method", "list")
+	params.Add("version", "1")
+	params.Add("additional", "[\"encryption\"]")
+
+	type ShareInfos struct {
+		Shares []ShareInfo `json:"shares"`
+	}
+
+	resp, err := dsm.sendRequest("", &ShareInfos{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return nil, err
+	}
+
+	infos, ok := resp.Data.(*ShareInfos)
+	if !ok {
+		return nil, fmt.Errorf("Failed to assert response to %T", &ShareInfos{})
+	}
+
+	return infos.Shares, nil
+}
+
+func (dsm *DSM) ShareCreate(spec ShareCreateSpec) error {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.Share")
+	params.Add("method", "create")
+	params.Add("version", "1")
+	params.Add("name", strconv.Quote(spec.Name))
+
+	js, err := json.Marshal(spec.ShareInfo)
+	if err != nil {
+		return err
+	}
+	params.Add("shareinfo", string(js))
+
+	// response : {"data":{"name":"Share-2"},"success":true}
+	_, err = dsm.sendRequest("", &struct{}{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (dsm *DSM) ShareDelete(shareName string) error {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.Share")
+	params.Add("method", "delete")
+	params.Add("version", "1")
+	params.Add("name", strconv.Quote(shareName))
+
+	// response : {"success":true}
+	_, err := dsm.sendRequest("", &struct{}{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

pkg/dsm/webapi/storage.go

@@ -0,0 +1,67 @@
+// Copyright 2021 Synology Inc.
+
+package webapi
+
+import (
+	"fmt"
+	"strconv"
+	"net/url"
+)
+
+type VolInfo struct {
+	Name      string `json:"display_name"`
+	Path      string `json:"volume_path"`
+	Status    string `json:"status"`
+	FsType    string `json:"fs_type"`
+	Size      string `json:"size_total_byte"`
+	Free      string `json:"size_free_byte"`
+	Container string `json:"container"`
+	Location  string `json:"location"`
+}
+
+func (dsm *DSM) VolumeList() ([]VolInfo, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.Storage.Volume")
+	params.Add("method", "list")
+	params.Add("version", "1")
+	params.Add("offset", "0")
+	params.Add("limit", "-1")
+	params.Add("location", "all")
+
+	type VolInfos struct {
+		Vols []VolInfo `json:"volumes"`
+	}
+
+	resp, err := dsm.sendRequest("", &VolInfos{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return nil, err
+	}
+
+	volInfos, ok := resp.Data.(*VolInfos)
+	if !ok {
+		return nil, fmt.Errorf("Failed to assert response to %T", &VolInfos{})
+	}
+
+	return volInfos.Vols, nil
+}
+
+func (dsm *DSM) VolumeGet(name string) (VolInfo, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.Storage.Volume")
+	params.Add("method", "get")
+	params.Add("version", "1")
+	params.Add("volume_path", strconv.Quote(name))
+
+	type Info struct {
+		Volume VolInfo `json:"volume"`
+	}
+	info := Info{}
+
+	_, err := dsm.sendRequest("", &info, params, "webapi/entry.cgi")
+	if err != nil {
+		return VolInfo{}, err
+	}
+
+	return info.Volume, nil
+}
+

pkg/dsm/webapi/systeminfo.go

@@ -0,0 +1,57 @@
+// Copyright 2021 Synology Inc.
+
+package webapi
+
+import (
+	"fmt"
+	"net/url"
+)
+
+type DsmInfo struct {
+	Hostname string `json:"hostname"`
+}
+
+type DsmSysInfo struct {
+	Model       string `json:"model"`
+	FirmwareVer string `json:"firmware_ver"`
+	Serial      string `json:"serial"`
+}
+
+func (dsm *DSM) DsmInfoGet() (*DsmInfo, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.System")
+	params.Add("method", "info")
+	params.Add("version", "1")
+	params.Add("type", "network")
+
+	resp, err := dsm.sendRequest("", &DsmInfo{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return nil, err
+	}
+
+	dsmInfo, ok := resp.Data.(*DsmInfo)
+	if !ok {
+		return nil, fmt.Errorf("Failed to assert response to %T", &DsmInfo{})
+	}
+
+	return dsmInfo, nil
+}
+
+func (dsm *DSM) DsmSystemInfoGet() (*DsmSysInfo, error) {
+	params := url.Values{}
+	params.Add("api", "SYNO.Core.System")
+	params.Add("method", "info")
+	params.Add("version", "1")
+
+	resp, err := dsm.sendRequest("", &DsmSysInfo{}, params, "webapi/entry.cgi")
+	if err != nil {
+		return nil, err
+	}
+
+	dsmInfo, ok := resp.Data.(*DsmSysInfo)
+	if !ok {
+		return nil, fmt.Errorf("Failed to assert response to %T", &DsmSysInfo{})
+	}
+
+	return dsmInfo, nil
+}

pkg/dsm/webapi/utils.go

@@ -0,0 +1 @@
+package webapi