def get_locator(self):
"""
Get a block locator object to give our remote peer when fetching headers/merkle blocks.
"""
locator = CBlockLocator()
parent = self.get_block_id(self.get_height())
def rollback(parent, n):
for i in range(n):
parent = self._get_parent(parent)
return parent
step = -1
start = 0
height = self.get_height()
while (True):
if start >= 10:
step *= 2
start = 0
locator.vHave.append(lx(parent))
parent = rollback(parent, abs(step))
start += 1
height += step
if height <= self._get_starting_height() + abs(step):
break
return locator
class msg_getheaders(MsgSerializable):
command = b"getheaders"
def __init__(self, protover=PROTO_VERSION):
super(msg_getheaders, self).__init__(protover)
self.locator = CBlockLocator()
self.hashstop = b'\x00'*32
@classmethod
def msg_deser(cls, f, protover=PROTO_VERSION):
c = cls()
c.locator = CBlockLocator.stream_deserialize(f)
c.hashstop = ser_read(f, 32)
return c
def msg_ser(self, f):
self.locator.stream_serialize(f)
f.write(self.hashstop)
def __repr__(self):
return "msg_getheaders(locator=%s hashstop=%s)" % (repr(self.locator), b2x(self.hashstop))
class msg_getheaders(MsgSerializable):
command = b"getheaders"
def __init__(self, protover=PROTO_VERSION):
super(msg_getheaders, self).__init__(protover)
self.locator = CBlockLocator()
self.hashstop = b"\x00" * 32
@classmethod
def msg_deser(cls, f, protover=PROTO_VERSION):
c = cls()
c.locator = CBlockLocator.stream_deserialize(f)
c.hashstop = ser_read(f, 32)
return c
def msg_ser(self, f):
self.locator.stream_serialize(f)
f.write(self.hashstop)
def __repr__(self):
return "msg_getheaders(locator=%s hashstop=%s)" % (repr(self.locator), b2x(self.hashstop))
def send_getheaders(self, block_hash_string):
locator = CBlockLocator()
locator.vHave = [lx(block_hash_string)]
msg = msg_getheaders()
msg.locator = locator
self.send_message(msg)
def msg_deser(cls, f, protover=PROTO_VERSION):
c = cls()
c.locator = CBlockLocator.stream_deserialize(f)
c.hashstop = ser_read(f, 32)
return c
def __init__(self, protover=PROTO_VERSION):
super(msg_getheaders, self).__init__(protover)
self.locator = CBlockLocator()
self.hashstop = b'\x00'*32
def msg_deser(cls, f, protover=PROTO_VERSION):
c = cls()
c.locator = CBlockLocator.stream_deserialize(f)
c.hashstop = ser_read(f, 32)
return c
def __init__(self, protover=PROTO_VERSION):
super(msg_getheaders, self).__init__(protover)
self.locator = CBlockLocator()
self.hashstop = b"\x00" * 32
