def _run_ff(blockchain):
# this kind of works, but it's lame because we put
# peers into a queue, so they'll never be garbage collected
# even if they vanish. I think.
while 1:
priority, (peer, lbi, rate_dict) = yield from peer_queue.get()
if lbi - blockchain.length() > 0:
# let's get some headers from this guy!
start_time = time.time()
h = blockchain.last_block_hash()
try:
headers = yield from asyncio.wait_for(get_headers_hashes(
peer, h),
timeout=10)
except EOFError:
# this peer is dead... so don't put it back in the queue
continue
except asyncio.TimeoutError:
# this peer timed out. How useless
continue
# TODO: what if the stupid client sends us bogus headers?
# how will we ever figure this out?
# answer: go through headers and remove fake ones or ones that we've seen
# check hash, difficulty, difficulty against hash, and that they form
# a chain. This make it expensive to produce bogus headers
time_elapsed = time.time() - start_time
rate_dict["total_seconds"] += time_elapsed
rate_dict["records"] += len(headers)
priority = -rate_dict["records"] / rate_dict["total_seconds"]
# let's make sure we actually extend the chain
ops = blockchain.add_nodes(
(h.hash(), h.previous_block_hash, h.difficulty)
for h in headers)
## this hack is necessary because the stupid default client
# does not send the genesis block!
try:
while len(ops) == 0:
ops = yield from asyncio.wait_for(_fetch_missing(
peer, blockchain),
timeout=30)
except Exception:
logging.exception("problem fetching missing parents")
if len(ops) > 0:
peer_queue.put_nowait((priority, (peer, lbi, rate_dict)))
def _run_ff(blockchain):
# this kind of works, but it's lame because we put
# peers into a queue, so they'll never be garbage collected
# even if they vanish. I think.
while 1:
priority, (peer, lbi, rate_dict) = yield from peer_queue.get()
if lbi - blockchain.length() > 0:
# let's get some headers from this guy!
start_time = time.time()
h = blockchain.last_block_hash()
try:
headers = yield from asyncio.wait_for(get_headers_hashes(peer, h), timeout=10)
except EOFError:
# this peer is dead... so don't put it back in the queue
continue
except asyncio.TimeoutError:
# this peer timed out. How useless
continue
# TODO: what if the stupid client sends us bogus headers?
# how will we ever figure this out?
# answer: go through headers and remove fake ones or ones that we've seen
# check hash, difficulty, difficulty against hash, and that they form
# a chain. This make it expensive to produce bogus headers
time_elapsed = time.time() - start_time
rate_dict["total_seconds"] += time_elapsed
rate_dict["records"] += len(headers)
priority = - rate_dict["records"] / rate_dict["total_seconds"]
# let's make sure we actually extend the chain
ops = blockchain.add_headers(headers)
## this hack is necessary because the stupid default client
# does not send the genesis block!
try:
while len(ops) == 0:
ops = yield from asyncio.wait_for(_fetch_missing(peer, blockchain), timeout=30)
except Exception:
logging.exception("problem fetching missing parents")
if len(ops) > 0:
peer_queue.put_nowait((priority, (peer, lbi, rate_dict)))
def run_peer2():
r = []
headers = yield from standards.get_headers_hashes(peer2, after_block_hash=b"\0" * 32)
r.append(headers)
return r
def run_peer2():
r = []
headers = yield from standards.get_headers_hashes(
peer2, after_block_hash=b'\0' * 32)
r.append(headers)
return r
def run_peer2():
r = []
headers = yield from standards.get_headers_hashes(peer2, until_block_hash=b'\0' * 32)
r.append(headers)
return r
