package netmap import ( "errors" "github.com/nspcc-dev/neofs-api-go/pkg/netmap" ) // Source is an interface that wraps // basic network map receiving method. type Source interface { // GetNetMap reads the diff-th past network map from the storage. // Calling with zero diff returns latest network map. // It returns the pointer to requested network map and any error encountered. // // GetNetMap must return exactly one non-nil value. // GetNetMap must return ErrNotFound if the network map is not in storage. // // Implementations must not retain the network map pointer and modify // the network map through it. GetNetMap(diff uint64) (*netmap.Netmap, error) } // ErrNotFound is the error returned when network map was not found in storage. var ErrNotFound = errors.New("network map not found") // GetLatestNetworkMap requests and returns latest network map from storage. func GetLatestNetworkMap(src Source) (*netmap.Netmap, error) { return src.GetNetMap(0) } // GetPreviousNetworkMap requests and returns previous from latest network map from storage. func GetPreviousNetworkMap(src Source) (*netmap.Netmap, error) { return src.GetNetMap(1) }