// Life requests the life cycle of the given entity from the given
// server-side API facade via the given caller.
func Life(caller base.Caller, facadeName string, tag names.Tag) (params.Life, error) {
var result params.LifeResults
args := params.Entities{
Entities: []params.Entity{{Tag: tag.String()}},
}
if err := caller.Call(facadeName, "", "Life", args, &result); err != nil {
return "", err
}
if len(result.Results) != 1 {
return "", errors.Errorf("expected 1 result, got %d", len(result.Results))
}
if err := result.Results[0].Error; err != nil {
return "", err
}
return result.Results[0].Life, nil
}
// Watch starts a NotifyWatcher for the entity with the specified tag.
func Watch(caller base.Caller, facadeName string, tag names.Tag) (watcher.NotifyWatcher, error) {
var results params.NotifyWatchResults
args := params.Entities{
Entities: []params.Entity{{Tag: tag.String()}},
}
err := caller.Call(facadeName, "", "Watch", args, &results)
if err != nil {
return nil, err
}
if len(results.Results) != 1 {
return nil, fmt.Errorf("expected 1 result, got %d", len(results.Results))
}
result := results.Results[0]
if result.Error != nil {
return nil, result.Error
}
return watcher.NewNotifyWatcher(caller, result), nil
}