def step_impl(context):
from pyethereum.utils import big_endian_to_int as idec
decoded_packet = context.packeter.load_packet(context.packet)[1][3]
port = idec(decoded_packet[4])
node_id = decoded_packet[5]
assert(context.peer.port == port)
assert(context.peer.node_id == node_id)
def load_packet(cls, packet):
'''
Though TCP provides a connection-oriented medium, Ethereum nodes
communicate in terms of packets. These packets are formed as a 4-byte
synchronisation token (0x22400891), a 4-byte "payload size", to be
interpreted as a big-endian integer and finally an N-byte
RLP-serialised data structure, where N is the aforementioned
"payload size". To be clear, the payload size specifies the number of
bytes in the packet ''following'' the first 8.
:return: (success, result), where result should be None when fail,
and (header, payload_len, cmd, data) when success
'''
header = idec(packet[:4])
if header != cls.SYNCHRONIZATION_TOKEN:
return False, 'check header failed, skipping message,'\
'sync token was hex: %s' % hex(header)
try:
payload_len = idec(packet[4:8])
except Exception as e:
return False, str(e)
if len(packet) < payload_len + 8:
return False, 'Packet is broken'
try:
payload = lrlp_decode(packet[8:8 + payload_len])
except Exception as e:
return False, str(e)
#logger.debug('load packet, cmd:%d %r', idec(payload[0]), Packeter.cmd_map.get(idec(payload[0]),'unknown'))
if (not len(payload)) or (idec(payload[0]) not in cls.cmd_map):
return False, 'check cmd %r failed' % idec(payload[0])
cmd = Packeter.cmd_map.get(idec(payload[0]))
remain = packet[8 + payload_len:]
return True, (header, payload_len, cmd, payload[1:], remain)
def load_packet(cls, packet):
'''
Though TCP provides a connection-oriented medium, Ethereum nodes
communicate in terms of packets. These packets are formed as a 4-byte
synchronisation token (0x22400891), a 4-byte "payload size", to be
interpreted as a big-endian integer and finally an N-byte
RLP-serialised data structure, where N is the aforementioned
"payload size". To be clear, the payload size specifies the number of
bytes in the packet ''following'' the first 8.
:return: (success, result), where result should be None when fail,
and (header, payload_len, cmd, data) when success
'''
header = idec(packet[:4])
if header != cls.SYNCHRONIZATION_TOKEN:
return False, 'check header failed, skipping message,'\
'sync token was hex: %s' % hex(header)
try:
payload_len = idec(packet[4:8])
except Exception as e:
return False, str(e)
if len(packet) < payload_len + 8:
return False, 'Packet is broken'
try:
payload = lrlp_decode(packet[8:8 + payload_len])
except Exception as e:
return False, str(e)
#logger.debug('load packet, cmd:%d %r', idec(payload[0]), Packeter.cmd_map.get(idec(payload[0]),'unknown'))
if (not len(payload)) or (idec(payload[0]) not in cls.cmd_map):
return False, 'check cmd %r failed' % idec(payload[0])
cmd = Packeter.cmd_map.get(idec(payload[0]))
remain = packet[8 + payload_len:]
return True, (header, payload_len, cmd, payload[1:], remain)
def packet_cmd(cls, packet):
try:
v = idec(rlp.descend(packet[8:200], 0))
except rlp.DecodingError:
v = -1
return Packeter.cmd_map.get(v, 'invalid')
def packet_size(cls, packet):
return idec(packet[4:8]) + 8
def packet_cmd(cls, packet):
try:
v = idec(rlp.descend(packet[8:200], 0))
except rlp.DecodingError:
v = -1
return Packeter.cmd_map.get(v, 'invalid')
def packet_size(cls, packet):
return idec(packet[4:8]) + 8
def packet_cmd(cls, packet):
return Packeter.cmd_map.get(idec(rlp.descend(packet[8:200], 0)))
def packet_cmd(cls, packet):
return Packeter.cmd_map.get(idec(rlp.descend(packet[8:200],0)))
