// EnsureAvailabilitySingle applies a single StateServersSpec specification to the current environment.
// Exported so it can be called by the legacy client API in the client package.
func EnsureAvailabilitySingle(st *state.State, spec params.StateServersSpec) (params.StateServersChanges, error) {
if !st.IsStateServer() {
return params.StateServersChanges{}, errors.New("unsupported with hosted environments")
}
// Check if changes are allowed and the command may proceed.
blockChecker := common.NewBlockChecker(st)
if err := blockChecker.ChangeAllowed(); err != nil {
return params.StateServersChanges{}, errors.Trace(err)
}
// Validate the environment tag if present.
if spec.EnvironTag != "" {
tag, err := names.ParseEnvironTag(spec.EnvironTag)
if err != nil {
return params.StateServersChanges{}, errors.Errorf("invalid environment tag: %v", err)
}
if _, err := st.FindEntity(tag); err != nil {
return params.StateServersChanges{}, err
}
}
series := spec.Series
if series == "" {
ssi, err := st.StateServerInfo()
if err != nil {
return params.StateServersChanges{}, err
}
// We should always have at least one voting machine
// If we *really* wanted we could just pick whatever series is
// in the majority, but really, if we always copy the value of
// the first one, then they'll stay in sync.
if len(ssi.VotingMachineIds) == 0 {
// Better than a panic()?
return params.StateServersChanges{}, fmt.Errorf("internal error, failed to find any voting machines")
}
templateMachine, err := st.Machine(ssi.VotingMachineIds[0])
if err != nil {
return params.StateServersChanges{}, err
}
series = templateMachine.Series()
}
changes, err := st.EnsureAvailability(spec.NumStateServers, spec.Constraints, series, spec.Placement)
if err != nil {
return params.StateServersChanges{}, err
}
return stateServersChanges(changes), nil
}
// NewAPI creates a new instance of the Backups API facade.
func NewAPI(st *state.State, resources *common.Resources, authorizer common.Authorizer) (*API, error) {
if !authorizer.AuthClient() {
return nil, errors.Trace(common.ErrPerm)
}
// For now, backup operations are only permitted on the controller environment.
if !st.IsStateServer() {
return nil, errors.New("backups are not supported for hosted environments")
}
// Get the backup paths.
dataDir, err := extractResourceValue(resources, "dataDir")
if err != nil {
return nil, errors.Trace(err)
}
logsDir, err := extractResourceValue(resources, "logDir")
if err != nil {
return nil, errors.Trace(err)
}
paths := backups.Paths{
DataDir: dataDir,
LogsDir: logsDir,
}
// Build the API.
machineID, err := extractResourceValue(resources, "machineID")
if err != nil {
return nil, errors.Trace(err)
}
b := API{
st: st,
paths: &paths,
machineID: machineID,
}
return &b, nil
}