def open_for_reading(self):
"""
open blob for reading
returns a file like object that can be read() from, and closed() when
finished
"""
if self._verified is True:
f = open(self.file_path, 'rb')
reader = HashBlobReader(f, self.reader_finished)
self.readers += 1
return reader
return None
def read(self, write_func):
def close_self(*args):
self.close_read_handle(file_handle)
return args[0]
file_sender = FileSender()
reader = HashBlobReader(write_func)
file_handle = self.open_for_reading()
if file_handle is not None:
d = file_sender.beginFileTransfer(file_handle, reader)
d.addCallback(close_self)
else:
d = defer.fail(IOError("Could not read the blob"))
return d