code: func (p *LocalProvider) CreateLocalDiscoveryService(mspID string) (fab.DiscoveryService, error) {
  	ref, err := p.cache.Get(lazycache.NewStringKey(mspID))
  	if err != nil {
  		return nil, errors.WithMessage(err, "failed to get local discovery service from cache")
  	}
  	return ref.(fab.DiscoveryService), nil
  }
docs: // CreateLocalDiscoveryService returns a local discovery service