package volumedrivers import ( "errors" "strings" "github.com/Sirupsen/logrus" "github.com/docker/docker/volume" ) var ( errNoSuchVolume = errors.New("no such volume") ) type volumeDriverAdapter struct { name string capabilities *volume.Capability proxy *volumeDriverProxy } func (a *volumeDriverAdapter) Name() string { return a.name } func (a *volumeDriverAdapter) Create(name string, opts map[string]string) (volume.Volume, error) { if err := a.proxy.Create(name, opts); err != nil { return nil, err } return &volumeAdapter{ proxy: a.proxy, name: name, driverName: a.name, }, nil } func (a *volumeDriverAdapter) Remove(v volume.Volume) error { return a.proxy.Remove(v.Name()) } func (a *volumeDriverAdapter) List() ([]volume.Volume, error) { ls, err := a.proxy.List() if err != nil { return nil, err } var out []volume.Volume for _, vp := range ls { out = append(out, &volumeAdapter{ proxy: a.proxy, name: vp.Name, driverName: a.name, eMount: vp.Mountpoint, }) } return out, nil } func (a *volumeDriverAdapter) Get(name string) (volume.Volume, error) { v, err := a.proxy.Get(name) if err != nil { return nil, err } // plugin may have returned no volume and no error if v == nil { return nil, errNoSuchVolume } return &volumeAdapter{ proxy: a.proxy, name: v.Name, driverName: a.Name(), eMount: v.Mountpoint, status: v.Status, }, nil } func (a *volumeDriverAdapter) Scope() string { cap := a.getCapabilities() return cap.Scope } func (a *volumeDriverAdapter) getCapabilities() volume.Capability { if a.capabilities != nil { return *a.capabilities } cap, err := a.proxy.Capabilities() if err != nil { // `GetCapabilities` is a not a required endpoint. // On error assume it's a local-only driver logrus.Warnf("Volume driver %s returned an error while trying to query its capabilities, using default capabilties: %v", a.name, err) return volume.Capability{Scope: volume.LocalScope} } // don't spam the warn log below just because the plugin didn't provide a scope if len(cap.Scope) == 0 { cap.Scope = volume.LocalScope } cap.Scope = strings.ToLower(cap.Scope) if cap.Scope != volume.LocalScope && cap.Scope != volume.GlobalScope { logrus.Warnf("Volume driver %q returned an invalid scope: %q", a.Name(), cap.Scope) cap.Scope = volume.LocalScope } a.capabilities = &cap return cap } type volumeAdapter struct { proxy *volumeDriverProxy name string driverName string eMount string // ephemeral host volume path status map[string]interface{} } type proxyVolume struct { Name string Mountpoint string Status map[string]interface{} } func (a *volumeAdapter) Name() string { return a.name } func (a *volumeAdapter) DriverName() string { return a.driverName } func (a *volumeAdapter) Path() string { if len(a.eMount) == 0 { a.eMount, _ = a.proxy.Path(a.name) } return a.eMount } func (a *volumeAdapter) CachedPath() string { return a.eMount } func (a *volumeAdapter) Mount(id string) (string, error) { var err error a.eMount, err = a.proxy.Mount(a.name, id) return a.eMount, err } func (a *volumeAdapter) Unmount(id string) error { err := a.proxy.Unmount(a.name, id) if err == nil { a.eMount = "" } return err } func (a *volumeAdapter) Status() map[string]interface{} { out := make(map[string]interface{}, len(a.status)) for k, v := range a.status { out[k] = v } return out }