code: func (is *identityMapperImpl) Get(pkiID common.PKIidType) (api.PeerIdentityType, error) {
  	is.RLock()
  	defer is.RUnlock()
  	storedIdentity, exists := is.pkiID2Cert[string(pkiID)]
  	if !exists {
  		return nil, errors.New("PKIID wasn't found")
  	}
  	return storedIdentity.fetchIdentity(), nil
  }
docs: // get returns the identity of a given pkiID, or error if such an identity
  // isn't found