def start(self, from_, to, n):
self._ended = False
self.conv.send(cbor.dumps([
0,
[cbor.VarList(from_), to, n]
]))
yield from self._receive_stream(n)
def __call__(self, from_, to):
self.conv.send(cbor.dumps([cbor.VarList(from_), [to] if to else []]))
tag, data = cbor.loads(self.conv.receive()) # sum type MsgHeaders
if tag == 1: # NoHeaders
print('no headers', data)
return []
return [DecodedBlockHeader(item) for item in data]
def handle_get_headers(node, conv):
'Peer wants some block headers from us.'
store = node.store
limit = config.CHAIN['block']['recoveryHeadersMessage']
while True:
checkpoints, tip = cbor.loads(conv.receive())
tip = tip[0] if tip else None
if node.retriever.recovering():
conv.send(cbor.dumps((1, b'server node is in recovery mode')))
continue
headers = None
if not checkpoints:
# return single header
headers = [store.blockheader(tip) if tip else store.tip()]
else:
# TODO filter in mainchain.
# get most recent checkpoint
checkpoint = max(checkpoints,
key=lambda k: store.blockheader(k).slot())
count = 0
headers = []
for h in store.iter_header_hash(checkpoint):
count += 1
if count > limit:
break
headers.append(store.blockheader(h))
if headers:
conv.send(
cbor.dumps((0, cbor.VarList(hdr.data for hdr in headers))))
else:
conv.send(cbor.dumps((1, b'loaded empty headers')))
def pack_addr_payload(path, hdpass):
'packHDAddressAttr'
plaintext = cbor.dumps(cbor.VarList(path))
return bytes(
CHACHA20_POLY1305(hdpass, 'python').seal(b'serokellfore', plaintext,
b''))