def peer_check(peer, DB):
peers=tools.db_get('peers')
if peers[peer]['length']==0 or random.random()<0.1:
ask_for_count(peer)
out=trade_peers(peer)
if type(out)==dict and 'error' in out:
return 1
peers=tools.db_get('peers')
length = tools.db_get('length')
diffLength= tools.db_get('diffLength')
size = max(len(diffLength), len(peers[peer]['diffLength']))
us = tools.buffer_(diffLength, size)
them = tools.buffer_(peers[peer]['diffLength'], size)
if them < us:
return give_block(peer, DB, peers[peer]['length'])
elif us == them:
try:
ask_for_count(peer)
trade_peers(peer)
return ask_for_txs(peer, DB)
except Exception as exc:
tools.log('ask for tx error')
tools.log(exc)
else:
return download_blocks(peer, DB, peers[peer]['length'], length)
def peer_check(i, peers, DB):
peer=peers[i][0]
block_count = cmd(peer, {'type': 'blockCount'})
if not isinstance(block_count, dict):
return
if 'error' in block_count.keys():
return
peers[i][2]=block_count['diffLength']
peers[i][3]=block_count['length']
length = tools.db_get('length')
diffLength= tools.db_get('diffLength')
size = max(len(diffLength), len(block_count['diffLength']))
us = tools.buffer_(diffLength, size)
them = tools.buffer_(block_count['diffLength'], size)
if them < us:
give_block(peer, DB, block_count['length'])
elif us == them:
try:
ask_for_txs(peer, DB)
except Exception as exc:
tools.log('ask for tx error')
tools.log(exc)
else:
download_blocks(peer, DB, block_count, length)
F=False
my_peers=tools.db_get('peers_ranked')
their_peers=cmd(peer, {'type':'peers'})
if type(my_peers)==list:
for p in their_peers:
if p not in my_peers:
F=True
my_peers.append(p)
if F:
tools.db_put('peers_ranked', my_peers)
def peer_check(peer, DB):
def cmd(x):
return networking.send_command(peer, x)
def download_blocks(peer, DB, peers_block_count, length):
def fork_check(newblocks, DB):
block = blockchain.db_get(DB['length'], DB)
recent_hash = tools.det_hash(block)
their_hashes = map(tools.det_hash, newblocks)
return recent_hash not in their_hashes
def bounds(length, peers_block_count):
if peers_block_count['length'] - length > custom.download_many:
end = length + custom.download_many - 1
else:
end = peers_block_count['length']
return [max(length - 2, 0), end]
blocks = cmd({'type': 'rangeRequest',
'range': bounds(length, peers_block_count)})
if not isinstance(blocks, list):
return []
for i in range(2): # Only delete a max of 2 blocks, otherwise a
# peer might trick us into deleting everything over and over.
if fork_check(blocks, DB):
blockchain.delete_block(DB)
DB['suggested_blocks'].extend(blocks)
return
def ask_for_txs(peer, DB):
txs = cmd({'type': 'txs'})
DB['suggested_txs'].extend(txs)
pushers = [x for x in DB['txs'] if x not in txs]
for push in pushers:
cmd({'type': 'pushtx', 'tx': push})
return []
def give_block(peer, DB, block_count):
cmd({'type': 'pushblock',
'block': blockchain.db_get(block_count['length'] + 1,
DB)})
return []
block_count = cmd({'type': 'blockCount'})
if not isinstance(block_count, dict):
return
if 'error' in block_count.keys():
return
length = DB['length']
size = max(len(DB['diffLength']), len(block_count['diffLength']))
us = tools.buffer_(DB['diffLength'], size)
them = tools.buffer_(block_count['diffLength'], size)
if them < us:
return give_block(peer, DB, block_count)
if us == them:
return ask_for_txs(peer, DB)
return download_blocks(peer, DB, block_count, length)
def peer_check(peer, DB):
block_count = cmd(peer, {'type': 'blockCount'})
if not isinstance(block_count, dict):
return
if 'error' in block_count.keys():
return
length = DB['length']
size = max(len(DB['diffLength']), len(block_count['diffLength']))
us = tools.buffer_(DB['diffLength'], size)
them = tools.buffer_(block_count['diffLength'], size)
if them < us:
return give_block(peer, DB, block_count['length'])
if us == them:
return ask_for_txs(peer, DB)
return download_blocks(peer, DB, block_count, length)
def send_msg(data, sock):
data=tools.package(data)
data=tools.buffer_(str(len(data)), 5)+data
while data:
time.sleep(0.0001)
try:
sent = sock.send(data)
except:
return 'peer died'
data = data[sent:]
return 0
def hexInvert(n):
# Use double-size for division, to reduce information leakage.
return tools.buffer_(str(hex(int('f' * 128, 16) / int(n, 16)))[2: -1], 64)
def hexSum(a, b):
# Sum of numbers expressed as hexidecimal strings
return tools.buffer_(str(hex(int(a, 16)+int(b, 16)))[2: -1], 64)
def targetTimesFloat(target, number):
a = int(str(target), 16)
b = int(a * number)
return tools.buffer_(str(hex(b))[2:-1], 64)
def targetTimesFloat(target, number):
a = int(str(target), 16)
b = int(a * number)
return tools.buffer_(str(hex(b))[2: -1], 64)
def hexSum(a, b):
# Sum of numbers expressed as hexidecimal strings
return tools.buffer_(str(hex(int(a, 16) + int(b, 16)))[2:-1], 64)
def hexInvert(n):
# Use double-size for division, to reduce information leakage.
return tools.buffer_(str(hex(int('f' * 128, 16) / int(n, 16)))[2:-1], 64)
def targetTimesFloat(target, number):
a = int(str(target), 16)
b = int(
a * number
) # this should be rational multiplication followed by integer estimation
return tools.buffer_(str(hex(b))[2:-1], 64)
def targetTimesFloat(target, number):
a = int(str(target), 16)
b = int(a * number)#this should be rational multiplication followed by integer estimation
return tools.buffer_(str(hex(b))[2: -1], 64)
def peer_check(peer, DB):
def cmd(x):
return networking.send_command(peer, x)
def download_blocks(peer, DB, peers_block_count, length):
def fork_check(newblocks, DB):
length = copy.deepcopy(DB['length'])
block = blockchain.db_get(length, DB)
recent_hash = tools.det_hash(block)
their_hashes = map(tools.det_hash, newblocks)
return recent_hash not in map(tools.det_hash, newblocks)
def bounds(length, peers_block_count, DB):
if peers_block_count['length'] - length > custom.download_many:
end = length + custom.download_many - 1
else:
end = peers_block_count['length']
return [max(length - 2, 0), end]
blocks = cmd({
'type': 'rangeRequest',
'range': bounds(length, peers_block_count, DB)
})
if type(blocks) != type([1, 2]):
return []
for i in range(10): # Only delete a max of 20 blocks, otherwise a
# peer might trick us into deleting everything over and over.
if fork_check(blocks, DB):
blockchain.delete_block(DB)
DB['suggested_blocks'] += blocks
return
def ask_for_txs(peer, DB):
txs = cmd({'type': 'txs'})
for tx in txs:
DB['suggested_txs'].append(tx)
pushers = [x for x in DB['txs'] if x not in txs]
for push in pushers:
cmd({'type': 'pushtx', 'tx': push})
return []
def give_block(peer, DB, block_count):
cmd({
'type': 'pushblock',
'block': blockchain.db_get(block_count['length'] + 1, DB)
})
return []
block_count = cmd({'type': 'blockCount'})
if type(block_count) != type({'a': 1}):
return
if 'error' in block_count.keys():
return
length = DB['length']
size = max(len(DB['diffLength']), len(block_count['diffLength']))
us = tools.buffer_(DB['diffLength'], size)
them = tools.buffer_(block_count['diffLength'], size)
if them < us:
return give_block(peer, DB, block_count)
if us == them:
return ask_for_txs(peer, DB)
return download_blocks(peer, DB, block_count, length)