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/
plugin_volume.go
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/
plugin_volume.go
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// Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
package main
import (
"encoding/json"
"errors"
"fmt"
"log"
"net/http"
"path"
"regexp"
"github.com/NVIDIA/nvidia-docker/src/nvidia"
)
var (
ErrVolumeBadFormat = errors.New("bad volume format")
ErrVolumeUnsupported = errors.New("unsupported volume")
ErrVolumeNotFound = errors.New("no such volume")
ErrVolumeVersion = errors.New("invalid volume version")
)
type pluginVolume struct{}
func (p *pluginVolume) implement() string { return "VolumeDriver" }
func (p *pluginVolume) register(api *PluginAPI) {
prefix := "/" + p.implement()
api.Handle("POST", prefix+".Create", p.create)
api.Handle("POST", prefix+".Remove", p.remove)
api.Handle("POST", prefix+".Mount", p.mount)
api.Handle("POST", prefix+".Unmount", p.unmount)
api.Handle("POST", prefix+".Path", p.path)
api.Handle("POST", prefix+".Get", p.get)
api.Handle("POST", prefix+".List", p.list)
api.Handle("POST", prefix+".Capabilities", p.capabilities)
}
func fmtError(err error, vol string) *string {
s := fmt.Sprintf("%v: %s", err, vol)
return &s
}
func getVolume(name string) (*nvidia.Volume, string, error) {
re := regexp.MustCompile("^([a-zA-Z0-9_.-]+)_([0-9.]+)$")
m := re.FindStringSubmatch(name)
if len(m) != 3 {
return nil, "", ErrVolumeBadFormat
}
volume, version := Volumes[m[1]], m[2]
if volume == nil {
return nil, "", ErrVolumeUnsupported
}
return volume, version, nil
}
func (p *pluginVolume) create(resp http.ResponseWriter, req *http.Request) {
var q struct{ Name string }
var r struct{ Err *string }
assert(json.NewDecoder(req.Body).Decode(&q))
log.Printf("Received create request for volume '%s'\n", q.Name)
volume, version, err := getVolume(q.Name)
if err != nil {
r.Err = fmtError(err, q.Name)
assert(json.NewEncoder(resp).Encode(r))
return
}
// The volume version requested needs to match the volume version in cache
if version != volume.Version {
r.Err = fmtError(ErrVolumeVersion, q.Name)
assert(json.NewEncoder(resp).Encode(r))
return
}
ok, err := volume.Exists()
assert(err)
if !ok {
assert(volume.Create(nvidia.LinkStrategy{}))
}
assert(json.NewEncoder(resp).Encode(r))
}
func (p *pluginVolume) remove(resp http.ResponseWriter, req *http.Request) {
var q struct{ Name string }
var r struct{ Err *string }
assert(json.NewDecoder(req.Body).Decode(&q))
log.Printf("Received remove request for volume '%s'\n", q.Name)
volume, version, err := getVolume(q.Name)
if err != nil {
r.Err = fmtError(err, q.Name)
} else {
assert(volume.Remove(version))
}
assert(json.NewEncoder(resp).Encode(r))
}
func (p *pluginVolume) mount(resp http.ResponseWriter, req *http.Request) {
var q struct{ Name string }
var r struct{ Mountpoint, Err *string }
assert(json.NewDecoder(req.Body).Decode(&q))
log.Printf("Received mount request for volume '%s'\n", q.Name)
volume, version, err := getVolume(q.Name)
if err != nil {
r.Err = fmtError(err, q.Name)
assert(json.NewEncoder(resp).Encode(r))
return
}
ok, err := volume.Exists(version)
assert(err)
if !ok {
r.Err = fmtError(ErrVolumeNotFound, q.Name)
} else {
p := path.Join(volume.Path, version)
r.Mountpoint = &p
}
assert(json.NewEncoder(resp).Encode(r))
}
func (p *pluginVolume) unmount(resp http.ResponseWriter, req *http.Request) {
var q struct{ Name string }
var r struct{ Err *string }
assert(json.NewDecoder(req.Body).Decode(&q))
log.Printf("Received unmount request for volume '%s'\n", q.Name)
_, _, err := getVolume(q.Name)
if err != nil {
r.Err = fmtError(err, q.Name)
}
assert(json.NewEncoder(resp).Encode(r))
}
func (p *pluginVolume) path(resp http.ResponseWriter, req *http.Request) {
p.mount(resp, req)
}
func (p *pluginVolume) get(resp http.ResponseWriter, req *http.Request) {
type Volume struct{ Name, Mountpoint string }
var q struct{ Name string }
var r struct {
Volume *Volume
Err *string
}
assert(json.NewDecoder(req.Body).Decode(&q))
volume, version, err := getVolume(q.Name)
if err != nil {
r.Err = fmtError(err, q.Name)
assert(json.NewEncoder(resp).Encode(r))
return
}
ok, err := volume.Exists(version)
assert(err)
if !ok {
r.Err = fmtError(ErrVolumeNotFound, q.Name)
} else {
r.Volume = &Volume{
Name: q.Name,
Mountpoint: path.Join(volume.Path, version),
}
}
assert(json.NewEncoder(resp).Encode(r))
}
func (p *pluginVolume) list(resp http.ResponseWriter, req *http.Request) {
type Volume struct{ Name, Mountpoint string }
var r struct {
Volumes []Volume
Err *string
}
for _, vol := range Volumes {
versions, err := vol.ListVersions()
assert(err)
for _, v := range versions {
r.Volumes = append(r.Volumes, Volume{
Name: fmt.Sprintf("%s_%s", vol.Name, v),
Mountpoint: path.Join(vol.Path, v),
})
}
}
assert(json.NewEncoder(resp).Encode(r))
}
func (p *pluginVolume) capabilities(resp http.ResponseWriter, req *http.Request) {
type Capabilities struct{ Scope string }
var r struct {
Capabilities Capabilities
}
r.Capabilities = Capabilities{
Scope: "local",
}
assert(json.NewEncoder(resp).Encode(r))
}