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rename.go
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rename.go
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// Copyright 2020 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package spaces
import (
"github.com/juju/errors"
"github.com/juju/mgo/v2/txn"
"github.com/juju/names/v4"
apiservererrors "github.com/DavinZhang/juju/apiserver/errors"
"github.com/DavinZhang/juju/apiserver/params"
"github.com/DavinZhang/juju/controller"
"github.com/DavinZhang/juju/core/network"
"github.com/DavinZhang/juju/core/settings"
"github.com/DavinZhang/juju/state"
)
// RenameSpace describes a space that can be renamed.
type RenameSpace interface {
Refresh() error
Id() string
Name() string
RenameSpaceOps(toName string) []txn.Op
}
// RenameSpaceState describes state operations required
// to execute the renameSpace operation.
type RenameSpaceState interface {
// ControllerConfig returns current ControllerConfig.
ControllerConfig() (controller.Config, error)
// ConstraintsBySpaceName returns all the constraints
// that refer to the input space name.
ConstraintsBySpaceName(spaceName string) ([]Constraints, error)
}
// Settings describes methods for interacting with settings to apply
// space-based configuration deltas.
type Settings interface {
DeltaOps(key string, delta settings.ItemChanges) ([]txn.Op, error)
}
type renameSpaceState struct {
*state.State
}
func (st renameSpaceState) ConstraintsBySpaceName(spaceName string) ([]Constraints, error) {
stateCons, err := st.State.ConstraintsBySpaceName(spaceName)
if err != nil {
return nil, errors.Trace(err)
}
spaceCons := make([]Constraints, len(stateCons))
for i, cons := range stateCons {
spaceCons[i] = cons
}
return spaceCons, nil
}
type spaceRenameModelOp struct {
st RenameSpaceState
isController bool
space RenameSpace
settings Settings
toName string
}
func NewRenameSpaceOp(
isController bool, settings Settings, st RenameSpaceState, space RenameSpace, toName string,
) *spaceRenameModelOp {
return &spaceRenameModelOp{
st: st,
settings: settings,
space: space,
isController: isController,
toName: toName,
}
}
// Build (state.ModelOperation) creates and returns a slice of transaction
// operations necessary to rename a space.
func (o *spaceRenameModelOp) Build(attempt int) ([]txn.Op, error) {
if attempt > 0 {
if err := o.space.Refresh(); err != nil {
return nil, errors.Trace(err)
}
}
ops := o.space.RenameSpaceOps(o.toName)
constraintsWithSpace, err := o.st.ConstraintsBySpaceName(o.space.Name())
if err != nil {
return nil, errors.Trace(err)
}
for _, cons := range constraintsWithSpace {
ops = append(ops, cons.ChangeSpaceNameOps(o.space.Name(), o.toName)...)
}
if o.isController {
settingsDelta, err := o.getSettingsChanges(o.space.Name(), o.toName)
if err != nil {
return nil, errors.Annotatef(err, "retrieving settings changes")
}
newSettingsOps, err := o.settings.DeltaOps(state.ControllerSettingsGlobalKey, settingsDelta)
if err != nil {
return nil, errors.Trace(err)
}
ops = append(ops, newSettingsOps...)
}
return ops, nil
}
// getSettingsChanges get's skipped and returns nil if we are not in the controllerModel
func (o *spaceRenameModelOp) getSettingsChanges(fromSpaceName, toName string) (settings.ItemChanges, error) {
currentControllerConfig, err := o.st.ControllerConfig()
if err != nil {
return nil, errors.Trace(err)
}
var deltas settings.ItemChanges
if mgmtSpace := currentControllerConfig.JujuManagementSpace(); mgmtSpace == fromSpaceName {
change := settings.MakeModification(controller.JujuManagementSpace, fromSpaceName, toName)
deltas = append(deltas, change)
}
if haSpace := currentControllerConfig.JujuHASpace(); haSpace == fromSpaceName {
change := settings.MakeModification(controller.JujuHASpace, fromSpaceName, toName)
deltas = append(deltas, change)
}
return deltas, nil
}
// RenameSpace renames a space.
func (api *API) RenameSpace(args params.RenameSpacesParams) (params.ErrorResults, error) {
result := params.ErrorResults{}
if err := api.ensureSpacesAreMutable(); err != nil {
return result, err
}
result.Results = make([]params.ErrorResult, len(args.Changes))
for i, spaceRename := range args.Changes {
fromTag, err := names.ParseSpaceTag(spaceRename.FromSpaceTag)
if err != nil {
result.Results[i].Error = apiservererrors.ServerError(errors.Trace(err))
continue
}
if fromTag.Id() == network.AlphaSpaceName {
newErr := errors.Errorf("the %q space cannot be renamed", network.AlphaSpaceName)
result.Results[i].Error = apiservererrors.ServerError(newErr)
continue
}
toTag, err := names.ParseSpaceTag(spaceRename.ToSpaceTag)
if err != nil {
result.Results[i].Error = apiservererrors.ServerError(errors.Trace(err))
continue
}
toSpace, err := api.backing.SpaceByName(toTag.Id())
if err != nil && !errors.IsNotFound(err) {
newErr := errors.Annotatef(err, "retrieving space %q", toTag.Id())
result.Results[i].Error = apiservererrors.ServerError(errors.Trace(newErr))
continue
}
if toSpace != nil {
newErr := errors.AlreadyExistsf("space %q", toTag.Id())
result.Results[i].Error = apiservererrors.ServerError(errors.Trace(newErr))
continue
}
operation, err := api.opFactory.NewRenameSpaceOp(fromTag.Id(), toTag.Id())
if err != nil {
result.Results[i].Error = apiservererrors.ServerError(errors.Trace(err))
continue
}
if err = api.backing.ApplyOperation(operation); err != nil {
result.Results[i].Error = apiservererrors.ServerError(errors.Trace(err))
continue
}
}
return result, nil
}
func (o *spaceRenameModelOp) Done(err error) error {
return err
}