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proxy.go
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proxy.go
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package driver
import (
"errors"
"github.com/alibaba/pouch/storage/plugins"
)
// the following const variables is the protocol of remote volume driver.
const (
// remoteVolumeCreateService is the service path of creating volume.
remoteVolumeCreateService = "/VolumeDriver.Create"
// remoteVolumeRemoveService is the service path of removing volume.
remoteVolumeRemoveService = "/VolumeDriver.Remove"
// remoteVolumeMountService is the service path of mounting volume.
remoteVolumeMountService = "/VolumeDriver.Mount"
// remoteVolumeUnmountService is the service path of unmounting volume.
remoteVolumeUnmountService = "/VolumeDriver.Unmount"
// remoteVolumePathService is the service path of getting volume's mountpath.
remoteVolumePathService = "/VolumeDriver.Path"
// remoteVolumeGetService is the service path of getting volume.
remoteVolumeGetService = "/VolumeDriver.Get"
// remoteVolumeListService is the service path of listing all volumes.
remoteVolumeListService = "/VolumeDriver.List"
// remoteVolumeListService is the service path of getting the volume driver' capabilities.
remoteVolumeCapabilitiesService = "/VolumeDriver.Capabilities"
)
// remoteDriverProxy is a remote driver proxy.
type remoteDriverProxy struct {
Name string
client *plugins.PluginClient
}
// Create creates a volume.
func (proxy *remoteDriverProxy) Create(name string, opts map[string]string) error {
var req = remoteVolumeCreateReq{
Name: name,
Opts: opts,
}
var resp remoteVolumeCreateResp
if err := proxy.client.CallService(remoteVolumeCreateService, &req, &resp, true); err != nil {
return err
}
if resp.Err != "" {
return errors.New(resp.Err)
}
return nil
}
// Remove deletes a volume.
func (proxy *remoteDriverProxy) Remove(name string) error {
var req = remoteVolumeRemoveReq{
Name: name,
}
var resp remoteVolumeCreateResp
if err := proxy.client.CallService(remoteVolumeRemoveService, &req, &resp, true); err != nil {
return err
}
if resp.Err != "" {
return errors.New(resp.Err)
}
return nil
}
// Mount mounts a volume.
func (proxy *remoteDriverProxy) Mount(name, id string) (string, error) {
var req = remoteVolumeMountReq{
Name: name,
ID: id,
}
var resp remoteVolumeMountResp
if err := proxy.client.CallService(remoteVolumeMountService, &req, &resp, true); err != nil {
return "", err
}
if resp.Err != "" {
return "", errors.New(resp.Err)
}
return resp.Mountpoint, nil
}
/// Umount unmounts a volume.
func (proxy *remoteDriverProxy) Unmount(name, id string) error {
var req = remoteVolumeUnmountReq{
Name: name,
ID: id,
}
var resp remoteVolumeUnmountResp
if err := proxy.client.CallService(remoteVolumeUnmountService, &req, &resp, true); err != nil {
return err
}
if resp.Err != "" {
return errors.New(resp.Err)
}
return nil
}
// Path returns the mount path.
func (proxy *remoteDriverProxy) Path(name string) (string, error) {
var req = remoteVolumePathReq{
Name: name,
}
var resp remoteVolumePathResp
if err := proxy.client.CallService(remoteVolumePathService, &req, &resp, true); err != nil {
return "", err
}
if resp.Err != "" {
return "", errors.New(resp.Err)
}
return resp.Mountpoint, nil
}
// Get returns the remote volume.
func (proxy *remoteDriverProxy) Get(name string) (*remoteVolumeDesc, error) {
var req = remoteVolumeGetReq{
Name: name,
}
var resp remoteVolumeGetResp
if err := proxy.client.CallService(remoteVolumeGetService, &req, &resp, true); err != nil {
return nil, err
}
if resp.Err != "" {
return nil, errors.New(resp.Err)
}
return resp.Volume, nil
}
// List returns all remote volumes.
func (proxy *remoteDriverProxy) List() ([]*remoteVolumeDesc, error) {
var req remoteVolumeListReq
var resp remoteVolumeListResp
if err := proxy.client.CallService(remoteVolumeListService, &req, &resp, true); err != nil {
return nil, err
}
if resp.Err != "" {
return nil, errors.New(resp.Err)
}
return resp.Volumes, nil
}
// Capabilities returns the driver capabilities.
func (proxy *remoteDriverProxy) Capabilities() (*remoteVolumeCapability, error) {
var req remoteVolumeCapabilitiesReq
var resp remoteVolumeCapabilitiesResp
if err := proxy.client.CallService(remoteVolumeCapabilitiesService, &req, &resp, true); err != nil {
return nil, err
}
if resp.Err != "" {
return nil, errors.New(resp.Err)
}
return resp.Capabilities, nil
}