def read_backblaze_meta_chunk(self,
req,
storage_method,
meta_chunk,
meta_start=None,
meta_end=None):
container_id = safe_get_header(req, 'container_id')
sysmeta = {'container_id': container_id}
key_file = self.conf.get('key_file')
try:
creds = BackblazeUtils.get_credentials(storage_method, key_file)
except ConfigurationException as exc:
return Response(exc, 500)
if meta_start is not None:
if meta_start < 0:
offset = meta_start
size = -meta_start
elif meta_end is not None:
offset = meta_start
size = meta_end - meta_start + 1
else:
offset = meta_start
size = None
elif meta_end is not None:
offset = 0
size = meta_end + 1
handler = BackblazeChunkDownloadHandler(sysmeta, meta_chunk, offset,
size, None, creds)
stream = handler.get_stream()
return Response(stream, 200)
def _fetch_stream_backblaze(self, meta, chunks, ranges, storage_method, key_file):
backblaze_info = self._b2_credentials(storage_method, key_file)
total_bytes = 0
current_offset = 0
size = None
offset = 0
for pos in range(len(chunks)):
if ranges:
offset = ranges[pos][0]
size = ranges[pos][1]
if size is None:
size = int(meta["length"])
chunk_size = int(chunks[pos][0]["size"])
if total_bytes >= size:
break
if current_offset + chunk_size > offset:
if current_offset < offset:
_offset = offset - current_offset
else:
_offset = 0
if chunk_size + total_bytes > size:
_size = size - total_bytes
else:
_size = chunk_size
handler = BackblazeChunkDownloadHandler(meta, chunks[pos], _offset, _size, backblaze_info=backblaze_info)
stream = handler.get_stream()
if not stream:
raise exc.OioException("Error while downloading")
total_bytes += len(stream)
yield stream
current_offset += chunk_size
def read_backblaze_meta_chunk(self, req, storage_method, meta_chunk,
meta_start=None, meta_end=None):
container_id = req.headers[sys_headers['container_id']]
sysmeta = {'container_id': container_id}
key_file = self.conf.get('key_file')
try:
creds = BackblazeUtils.get_credentials(storage_method, key_file)
except BackblazeUtilsException as exc:
return Response(exc, 500)
if meta_start is not None:
if meta_start < 0:
offset = meta_start
size = -meta_start
elif meta_end is not None:
offset = meta_start
size = meta_end - meta_start + 1
else:
offset = meta_start
size = None
elif meta_end is not None:
offset = 0
size = meta_end + 1
handler = BackblazeChunkDownloadHandler(sysmeta, meta_chunk,
offset, size,
None, creds)
stream = handler.get_stream()
return Response(stream, 200)
def _fetch_stream_backblaze(self, meta, chunks, ranges,
storage_method, key_file):
backblaze_info = self._b2_credentials(storage_method, key_file)
total_bytes = 0
current_offset = 0
size = None
offset = 0
for pos in range(len(chunks)):
if ranges:
offset = ranges[pos][0]
size = ranges[pos][1]
if size is None:
size = int(meta["length"])
chunk_size = int(chunks[pos][0]["size"])
if total_bytes >= size:
break
if current_offset + chunk_size > offset:
if current_offset < offset:
_offset = offset - current_offset
else:
_offset = 0
if chunk_size + total_bytes > size:
_size = size - total_bytes
else:
_size = chunk_size
handler = BackblazeChunkDownloadHandler(
meta, chunks[pos], _offset, _size,
backblaze_info=backblaze_info)
stream = handler.get_stream()
if not stream:
raise exc.OioException("Error while downloading")
total_bytes += len(stream)
yield stream
current_offset += chunk_size
