// NextOp is defined on the Resolver interface.
func (s *storageResolver) NextOp(
localState resolver.LocalState,
remoteState remotestate.Snapshot,
opFactory operation.Factory,
) (operation.Operation, error) {
var changed []names.StorageTag
for tag, storage := range remoteState.Storage {
life, ok := s.life[tag]
if !ok || life != storage.Life {
s.life[tag] = storage.Life
changed = append(changed, tag)
}
}
for tag := range s.life {
if _, ok := remoteState.Storage[tag]; !ok {
changed = append(changed, tag)
delete(s.life, tag)
}
}
if len(changed) > 0 {
return opFactory.NewUpdateStorage(changed)
}
if !localState.Installed && s.storage.Pending() == 0 {
logger.Infof("initial storage attachments ready")
}
return s.nextOp(localState, remoteState, opFactory)
}