code: func (ga *gossipAdapterImpl) GetIdentityByPKIID(pkiID common.PKIidType) api.PeerIdentityType {
  	identity, err := ga.idMapper.Get(pkiID)
  	if err != nil {
  		return nil
  	}
  	return identity
  }
docs: // GetIdentityByPKIID returns an identity of a peer with a certain
  // pkiID, or nil if not found