def test_delete(self):
self._clear_db()
db = LevelDB(DB_PATH, True)
self.assertFalse(b"test_key3" in db)
db.put(b"test_key3", b"test")
self.assertTrue(b"test_key3" in db)
db.delete(b"test_key3")
self.assertFalse(b"test_key3" in db)
db.close()
class LevelDBLevelManager:
# tag_ids = {45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 118}
def __init__(self, directory: str):
self._directory = directory
self._db = LevelDB(os.path.join(self._directory, "db"))
# self._levels format Dict[level, Dict[Tuple[cx, cz], List[Tuple[full_key, key_extension]]]]
self._levels: Dict[InternalDimension, Set[ChunkCoordinates]] = {}
self._dimension_name_map: Dict["Dimension", InternalDimension] = {}
self._batch_temp: Dict[bytes, Union[bytes, None]] = {}
self.register_dimension(None, "overworld")
self.register_dimension(1, "nether")
self.register_dimension(2, "end")
for key in self._db.keys():
if 9 <= len(key) <= 10 and key[8] == 118:
self._add_chunk(key)
elif 13 <= len(key) <= 14 and key[12] == 118:
self._add_chunk(key, has_level=True)
def save(self):
batch = {}
for key, val in self._batch_temp.items():
if val is None:
self._db.delete(key)
else:
batch[key] = val
self._db.putBatch(batch)
self._batch_temp.clear()
def close(self):
self._db.close()
@property
def dimensions(self) -> List["Dimension"]:
"""A list of all the levels contained in the world"""
return list(self._dimension_name_map.keys())
def register_dimension(
self,
dimension_internal: InternalDimension,
dimension_name: Optional["Dimension"] = None,
):
"""
Register a new dimension.
:param dimension_internal: The internal representation of the dimension
:param dimension_name: The name of the dimension shown to the user
:return:
"""
if dimension_name is None:
dimension_name: "Dimension" = f"DIM{dimension_internal}"
if (
dimension_internal not in self._levels
and dimension_name not in self._dimension_name_map
):
self._levels[dimension_internal] = set()
self._dimension_name_map[dimension_name] = dimension_internal
def _get_internal_dimension(self, dimension: "Dimension") -> InternalDimension:
if dimension in self._dimension_name_map:
return self._dimension_name_map[dimension]
else:
raise LevelDoesNotExist(dimension)
def all_chunk_coords(self, dimension: "Dimension") -> Set[ChunkCoordinates]:
internal_dimension = self._get_internal_dimension(dimension)
if internal_dimension in self._levels:
return self._levels[internal_dimension]
else:
return set()
def _add_chunk(self, key_: bytes, has_level: bool = False):
if has_level:
cx, cz, level = struct.unpack("<iii", key_[:12])
else:
cx, cz = struct.unpack("<ii", key_[:8])
level = None
if level not in self._levels:
self.register_dimension(level)
self._levels[level].add((cx, cz))
def get_chunk_data(
self, cx: int, cz: int, dimension: "Dimension"
) -> Dict[bytes, bytes]:
"""Get a dictionary of chunk key extension in bytes to the raw data in the key.
chunk key extension are the character(s) after <cx><cz>[level] in the key
Will raise ChunkDoesNotExist if the chunk does not exist
"""
iter_start = struct.pack("<ii", cx, cz)
iter_end = iter_start + b"\xff"
internal_dimension = self._get_internal_dimension(dimension)
if (
internal_dimension in self._levels
and (cx, cz) in self._levels[internal_dimension]
):
chunk_data = {}
for key, val in self._db.iterate(iter_start, iter_end):
if internal_dimension is None:
if 9 <= len(key) <= 10:
key_extension = key[8:]
else:
continue
else:
if (
13 <= len(key) <= 14
and struct.unpack("<i", key[8:12])[0] == internal_dimension
):
key_extension = key[12:]
else:
continue
chunk_data[key_extension] = val
return chunk_data
else:
raise ChunkDoesNotExist
def put_chunk_data(
self, cx: int, cz: int, data: Dict[bytes, bytes], dimension: "Dimension"
):
"""pass data to the region file class"""
# get the region key
internal_dimension = self._get_internal_dimension(dimension)
self._levels[internal_dimension].add((cx, cz))
if internal_dimension is None:
key_prefix = struct.pack("<ii", cx, cz)
else:
key_prefix = struct.pack("<iii", cx, cz, internal_dimension)
for key, val in data.items():
self._batch_temp[key_prefix + key] = val
def delete_chunk(self, cx: int, cz: int, dimension: "Dimension"):
if dimension in self._dimension_name_map:
internal_dimension = self._dimension_name_map[dimension]
if (
internal_dimension in self._levels
and (cx, cz) in self._levels[internal_dimension]
):
chunk_data = self.get_chunk_data(cx, cz, dimension)
self._levels[internal_dimension].remove((cx, cz))
for key in chunk_data.keys():
if internal_dimension is None:
key_prefix = struct.pack("<ii", cx, cz)
else:
key_prefix = struct.pack("<iii", cx, cz, internal_dimension)
self._batch_temp[key_prefix + key] = None