def get(self, key):
""" GETs a file from the server """
sock = self._connect()
f = sock.makefile()
f.write(struct.pack("B", BERTHA_GET))
f.write(from_hex(key))
f.flush()
sock.shutdown(socket.SHUT_WR)
return f
def size(self, key):
""" Returns the size of the blob on the server.
When the file does not exist, a KeyError is raised. """
sock = self._connect()
f = sock.makefile()
f.write(struct.pack("B", BERTHA_SIZE))
f.write(from_hex(key))
f.flush()
sock.shutdown(socket.SHUT_WR)
raw_size = f.read(8)
if len(raw_size) == 0:
raise KeyError
size = struct.unpack("<Q", raw_size)[0]
return size
def sget(self, key):
""" SGETs a file from the server. That is: a pair (fd, s)
is returned, where fd is a file object to read from
and s is the length of fd """
sock = self._connect()
f = sock.makefile()
f.write(struct.pack("B", BERTHA_SGET))
f.write(from_hex(key))
f.flush()
sock.shutdown(socket.SHUT_WR)
raw_size = f.read(8)
if len(raw_size) == 0:
raise KeyError
size = struct.unpack("<Q", raw_size)[0]
return (f, size)
