def read_connection_packet(self):
if len(self.recvbuf) < 3:
return None
packet_size = struct.unpack("<L", rzpad(self.recvbuf[:3], 4))[0]
if len(self.recvbuf) < 3 + packet_size:
return
self.recvbuf = self.recvbuf[3:]
packet = self.recvbuf[:packet_size]
self.recvbuf = self.recvbuf[packet_size:]
if len(packet) > 3:
packet = packet[-3:] + packet[:-3]
return packet
def _on_data(self):
"""Try to read P2P messages from the recv buffer.
This method reads data from the buffer in a loop. It deserializes,
parses and verifies the P2P header, then passes the P2P payload to
the on_message callback for processing."""
try:
while True:
if len(self.recvbuf) < 3:
return
packet_size = struct.unpack("<L", rzpad(self.recvbuf[:3],
4))[0]
if len(self.recvbuf) < 3 + packet_size:
return
packet_id = self.recvbuf[3]
if packet_id != PACKET_HELLO and packet_id != PACKET_DISCONNECT and (
not self.had_hello):
raise ValueError("bad protocol")
payload = self.recvbuf[4:3 + packet_size]
self.recvbuf = self.recvbuf[3 + packet_size:]
self._log_message("receive", packet_id)
if packet_id == PACKET_HELLO:
self.on_hello(payload)
elif packet_id == PACKET_DISCONNECT:
disconnect = rlp.decode(payload, Disconnect)
self.on_disconnect(disconnect)
elif packet_id == PACKET_PING:
self.on_ping()
elif packet_id == PACKET_PONG:
self.on_pong()
elif packet_id == PACKET_PONG:
pass
else:
assert packet_id == PACKET_PROTOCOL
self.on_protocol_packet(payload)
except Exception as e:
logger.exception('Error reading message: ' + repr(e))
raise
