def message(self, block: Union[str, int] = 'genesis') -> bytes:
"""Get payload for the failing noop operation
:param block: Specify operation branch (default is genesis)
:returns: Message bytes
"""
if len(self.contents) != 1 or self.contents[0]['kind'] != 'failing_noop':
raise NotImplementedError('Use for signing messages only')
branch = block if is_bh(str(block)) else self.shell.blocks[block].hash()
return b'\x03' + bytes.fromhex(self._spawn(branch=branch).forge())
def __call__(self) -> list: # type: ignore
""" Get block hashes (base58) for this interval.
"""
header = self._getitem(self._stop).header()
if is_bh(self._stop):
head = self._stop
else:
head = header['hash']
if self._start < 0:
length = abs(self._start)
else:
length = header['level'] - self._start + 1
return super(BlockSliceQuery, self).__call__(length=min(header['level'], length), head=head)
def __call__(self) -> list:
""" Get block hashes (base58) for this interval.
"""
if is_bh(self._stop):
head = self._stop
else:
head = self._getitem(self._stop).hash()
if self._start < 0:
length = abs(self._start)
else:
header = self._getitem(self._stop).header()
length = header['level'] - self._start + 1
return super(BlockSliceQuery, self).__call__(length=length, head=head)
def __call__(self, length=1, head=None, min_date=None):
""" Lists known heads of the blockchain sorted with decreasing fitness.
Optional arguments allows to returns the list of predecessors for known heads
or the list of predecessors for a given list of blocks.
:param length: The requested number of predecessors to returns (per requested head).
:param head: An empty argument requests blocks from the current heads. \
A non empty list allow to request specific fragment of the chain.
:param min_date: When `min_date` is provided, heads with a timestamp before `min_date` are filtered out
:rtype: list[list[str]]
"""
if isinstance(head, str) and not is_bh(head):
head = self.__getitem__(head).calculate_hash()
if min_date and not isinstance(min_date, int):
min_date = to_timestamp(min_date)
return super(BlocksQuery, self).__call__(length=length,
head=head,
min_date=min_date)
def test_is_bh(self, value, expected):
self.assertEqual(expected, is_bh(value))