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proxy.go
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proxy.go
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package graphdriver // import "github.com/docker/docker/daemon/graphdriver"
import (
"errors"
"fmt"
"io"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/containerfs"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/plugingetter"
"github.com/docker/docker/pkg/plugins"
)
type graphDriverProxy struct {
name string
p plugingetter.CompatPlugin
caps Capabilities
client *plugins.Client
}
type graphDriverRequest struct {
ID string `json:",omitempty"`
Parent string `json:",omitempty"`
MountLabel string `json:",omitempty"`
StorageOpt map[string]string `json:",omitempty"`
}
type graphDriverResponse struct {
Err string `json:",omitempty"`
Dir string `json:",omitempty"`
Exists bool `json:",omitempty"`
Status [][2]string `json:",omitempty"`
Changes []archive.Change `json:",omitempty"`
Size int64 `json:",omitempty"`
Metadata map[string]string `json:",omitempty"`
Capabilities Capabilities `json:",omitempty"`
}
type graphDriverInitRequest struct {
Home string
Opts []string `json:"Opts"`
idtools.IdentityMapping
}
func (d *graphDriverProxy) Init(home string, opts []string, idMap idtools.IdentityMapping) error {
if !d.p.IsV1() {
if cp, ok := d.p.(plugingetter.CountedPlugin); ok {
// always acquire here, it will be cleaned up on daemon shutdown
cp.Acquire()
}
}
args := &graphDriverInitRequest{
Home: home,
Opts: opts,
IdentityMapping: idMap,
}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Init", args, &ret); err != nil {
return err
}
if ret.Err != "" {
return errors.New(ret.Err)
}
caps, err := d.fetchCaps()
if err != nil {
return err
}
d.caps = caps
return nil
}
func (d *graphDriverProxy) fetchCaps() (Capabilities, error) {
args := &graphDriverRequest{}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Capabilities", args, &ret); err != nil {
if !plugins.IsNotFound(err) {
return Capabilities{}, err
}
}
return ret.Capabilities, nil
}
func (d *graphDriverProxy) String() string {
return d.name
}
func (d *graphDriverProxy) Capabilities() Capabilities {
return d.caps
}
func (d *graphDriverProxy) CreateReadWrite(id, parent string, opts *CreateOpts) error {
return d.create("GraphDriver.CreateReadWrite", id, parent, opts)
}
func (d *graphDriverProxy) Create(id, parent string, opts *CreateOpts) error {
return d.create("GraphDriver.Create", id, parent, opts)
}
func (d *graphDriverProxy) create(method, id, parent string, opts *CreateOpts) error {
args := &graphDriverRequest{
ID: id,
Parent: parent,
}
if opts != nil {
args.MountLabel = opts.MountLabel
args.StorageOpt = opts.StorageOpt
}
var ret graphDriverResponse
if err := d.client.Call(method, args, &ret); err != nil {
return err
}
if ret.Err != "" {
return errors.New(ret.Err)
}
return nil
}
func (d *graphDriverProxy) Remove(id string) error {
args := &graphDriverRequest{ID: id}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Remove", args, &ret); err != nil {
return err
}
if ret.Err != "" {
return errors.New(ret.Err)
}
return nil
}
func (d *graphDriverProxy) Get(id, mountLabel string) (containerfs.ContainerFS, error) {
args := &graphDriverRequest{
ID: id,
MountLabel: mountLabel,
}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Get", args, &ret); err != nil {
return nil, err
}
var err error
if ret.Err != "" {
err = errors.New(ret.Err)
}
return containerfs.NewLocalContainerFS(d.p.ScopedPath(ret.Dir)), err
}
func (d *graphDriverProxy) Put(id string) error {
args := &graphDriverRequest{ID: id}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Put", args, &ret); err != nil {
return err
}
if ret.Err != "" {
return errors.New(ret.Err)
}
return nil
}
func (d *graphDriverProxy) Exists(id string) bool {
args := &graphDriverRequest{ID: id}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Exists", args, &ret); err != nil {
return false
}
return ret.Exists
}
func (d *graphDriverProxy) Status() [][2]string {
args := &graphDriverRequest{}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Status", args, &ret); err != nil {
return nil
}
return ret.Status
}
func (d *graphDriverProxy) GetMetadata(id string) (map[string]string, error) {
args := &graphDriverRequest{
ID: id,
}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.GetMetadata", args, &ret); err != nil {
return nil, err
}
if ret.Err != "" {
return nil, errors.New(ret.Err)
}
return ret.Metadata, nil
}
func (d *graphDriverProxy) Cleanup() error {
if !d.p.IsV1() {
if cp, ok := d.p.(plugingetter.CountedPlugin); ok {
// always release
defer cp.Release()
}
}
args := &graphDriverRequest{}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Cleanup", args, &ret); err != nil {
return nil
}
if ret.Err != "" {
return errors.New(ret.Err)
}
return nil
}
func (d *graphDriverProxy) Diff(id, parent string) (io.ReadCloser, error) {
args := &graphDriverRequest{
ID: id,
Parent: parent,
}
body, err := d.client.Stream("GraphDriver.Diff", args)
if err != nil {
return nil, err
}
return body, nil
}
func (d *graphDriverProxy) Changes(id, parent string) ([]archive.Change, error) {
args := &graphDriverRequest{
ID: id,
Parent: parent,
}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.Changes", args, &ret); err != nil {
return nil, err
}
if ret.Err != "" {
return nil, errors.New(ret.Err)
}
return ret.Changes, nil
}
func (d *graphDriverProxy) ApplyDiff(id, parent string, diff io.Reader) (int64, error) {
var ret graphDriverResponse
if err := d.client.SendFile(fmt.Sprintf("GraphDriver.ApplyDiff?id=%s&parent=%s", id, parent), diff, &ret); err != nil {
return -1, err
}
if ret.Err != "" {
return -1, errors.New(ret.Err)
}
return ret.Size, nil
}
func (d *graphDriverProxy) DiffSize(id, parent string) (int64, error) {
args := &graphDriverRequest{
ID: id,
Parent: parent,
}
var ret graphDriverResponse
if err := d.client.Call("GraphDriver.DiffSize", args, &ret); err != nil {
return -1, err
}
if ret.Err != "" {
return -1, errors.New(ret.Err)
}
return ret.Size, nil
}