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HEADER_SIZE = 4
# this module is for sending discree messages over TCP
# this is achieved by prefixing all messages with their length
# calls to send and recv will also keep attempting to send all data unless this proves impossible
def send(sock, msg):
length = len(msg)
header = length.to_bytes(4, byteorder="big")
totalmsg = header + msg
sock.sendall(totalmsg)
def receive(sock):
header = recvall(sock, 4) #sock.recv(4)
length = int.from_bytes(header, byteorder="big")
return recvall(sock, length)
def recvall(sock, length):
chunks = []
bytes_recd = 0
while bytes_recd < length:
chunk = sock.recv(min(length - bytes_recd, 4096))
if chunk == b'':
break
#raise RuntimeError("socket connection broken")
chunks.append(chunk)
bytes_recd = bytes_recd + len(chunk)
return b''.join(chunks)
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