Implementation of Bitcoin's p2p protocol
'''
-from __future__ import division
-
-import hashlib
import random
-import struct
import time
from twisted.internet import defer, protocol, reactor, task
-from twisted.python import log
-import p2pool
from . import data as bitcoin_data
-from p2pool.util import datachunker, deferral, pack, variable
-
-class TooLong(Exception):
- pass
-
-class BaseProtocol(protocol.Protocol):
- def __init__(self, message_prefix, max_payload_length):
- self._message_prefix = message_prefix
- self._max_payload_length = max_payload_length
- self.dataReceived = datachunker.DataChunker(self.dataReceiver())
-
- def dataReceiver(self):
- while True:
- start = ''
- while start != self._message_prefix:
- start = (start + (yield 1))[-len(self._message_prefix):]
-
- command = (yield 12).rstrip('\0')
- length, = struct.unpack('<I', (yield 4))
- if length > self._max_payload_length:
- print 'length too large'
- continue
- checksum = yield 4
- payload = yield length
-
- if hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4] != checksum:
- print 'invalid hash for', self.transport.getPeer().host, repr(command), length, checksum.encode('hex'), hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4].encode('hex'), payload.encode('hex')
- continue
-
- type_ = getattr(self, 'message_' + command, None)
- if type_ is None:
- if p2pool.DEBUG:
- print 'no type for', repr(command)
- continue
-
- try:
- self.packetReceived(command, type_.unpack(payload))
- except:
- print 'RECV', command, payload[:100].encode('hex') + ('...' if len(payload) > 100 else '')
- log.err(None, 'Error handling message: (see RECV line)')
- self.badPeerHappened()
-
- def packetReceived(self, command, payload2):
- handler = getattr(self, 'handle_' + command, None)
- if handler is None:
- if p2pool.DEBUG:
- print 'no handler for', repr(command)
- return
-
- handler(**payload2)
-
- def badPeerHappened(self):
- self.transport.loseConnection()
-
- def sendPacket(self, command, payload2):
- if len(command) >= 12:
- raise ValueError('command too long')
- type_ = getattr(self, 'message_' + command, None)
- if type_ is None:
- raise ValueError('invalid command')
- #print 'SEND', command, repr(payload2)[:500]
- payload = type_.pack(payload2)
- if len(payload) > self._max_payload_length:
- raise TooLong('payload too long')
- self.transport.write(self._message_prefix + struct.pack('<12sI', command, len(payload)) + hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4] + payload)
-
- def __getattr__(self, attr):
- prefix = 'send_'
- if attr.startswith(prefix):
- command = attr[len(prefix):]
- return lambda **payload2: self.sendPacket(command, payload2)
- #return protocol.Protocol.__getattr__(self, attr)
- raise AttributeError(attr)
+from p2pool.util import deferral, p2protocol, pack, variable
-class Protocol(BaseProtocol):
+class Protocol(p2protocol.Protocol):
def __init__(self, net):
- BaseProtocol.__init__(self, net.P2P_PREFIX, 1000000)
+ p2protocol.Protocol.__init__(self, net.P2P_PREFIX, 1000000)
def connectionMade(self):
self.send_version(