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async block headers: avoid duplicate tip fields, handle electrumx server skipping blocks

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Janus 2018-09-04 12:36:47 +02:00 • committed by SomberNight
parent 4d95452ae7
commit 9c363db440
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2 changed files with 27 additions and 28 deletions
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40
electrum/interface.py
View file

@ -204,30 +204,26 @@ class Interface(PrintError):
@aiosafe
async def run_fetch_blocks(self, sub_reply, replies, conniface):
async with self.network.bhi_lock:
bhi = BlockHeaderInterface(conniface, sub_reply['height'], self.blockchain.height()+1, self)
bhi = BlockHeaderInterface(conniface, self.blockchain.height()+1, self)
await replies.put(blockchain.deserialize_header(bfh(sub_reply['hex']), sub_reply['height']))
self.print_error("checking if catched up {}-1 > {}, tip {}".format(sub_reply['height'], self.blockchain.height(), bhi.tip))
if sub_reply['height']-1 > self.blockchain.height():
last_status = await bhi.sync_until()
assert last_status == 'catchup', last_status
assert self.blockchain.height()+1 == bhi.height, (self.blockchain.height(), bhi.height)
while True:
self.network.notify('updated')
item = await replies.get()
async with self.network.bhi_lock:
if self.blockchain.height()-1 < item['block_height']:
await bhi.sync_until()
if self.blockchain.height() >= bhi.height and self.blockchain.check_header(item):
# another interface amended the blockchain
self.print_error("SKIPPING HEADER", bhi.height)
continue
if bhi.tip < bhi.height:
bhi.height = bhi.tip
if self.tip < bhi.height:
bhi.height = self.tip
await bhi.step(item)
bhi.tip = max(bhi.height, bhi.tip)
self.tip = max(bhi.height, self.tip)
class BlockHeaderInterface(PrintError):
def __init__(self, conn, tip, height, iface):
self.tip = tip
def __init__(self, conn, height, iface):
self.height = height
self.conn = conn
self.iface = iface
@ -237,31 +233,33 @@ class BlockHeaderInterface(PrintError):
async def sync_until(self, next_height=None):
if next_height is None:
next_height = self.tip
next_height = self.iface.tip
last = None
while last is None or self.height < next_height:
if next_height > self.height + 10:
could_connect, num_headers = await self.conn.request_chunk(self.height, next_height)
self.tip = max(self.height + num_headers, self.tip)
self.iface.tip = max(self.height + num_headers, self.iface.tip)
if not could_connect:
if self.height <= self.iface.network.max_checkpoint():
raise Exception('server chain conflicts with checkpoints or genesis')
last = await self.step()
self.tip = max(self.height, self.tip)
self.iface.tip = max(self.height, self.iface.tip)
continue
self.height = (self.height // 2016 * 2016) + num_headers
if self.height > next_height:
assert False, (self.height, self.tip)
assert False, (self.height, self.iface.tip)
last = 'catchup'
else:
last = await self.step()
self.tip = max(self.height, self.tip)
self.iface.tip = max(self.height, self.iface.tip)
return last
async def step(self, header=None):
assert self.height != 0
if header is None:
header = await self.conn.get_block_header(self.height, 'catchup')
chain = self.iface.blockchain.check_header(header) if 'mock' not in header else header['mock']['check'](header)
if chain: return 'catchup'
can_connect = blockchain.can_connect(header) if 'mock' not in header else header['mock']['connect'](self)
bad_header = None
@ -284,8 +282,8 @@ class BlockHeaderInterface(PrintError):
while not chain and not can_connect:
bad = self.height
bad_header = header
delta = self.tip - self.height
next_height = self.tip - 2 * delta
delta = self.iface.tip - self.height
next_height = self.iface.tip - 2 * delta
checkp = False
if next_height <= self.iface.network.max_checkpoint():
next_height = self.iface.network.max_checkpoint() + 1
@ -305,7 +303,7 @@ class BlockHeaderInterface(PrintError):
if type(can_connect) is bool:
# mock
self.height += 1
if self.height > self.tip:
if self.height > self.iface.tip:
assert False
return 'catchup'
self.iface.blockchain = can_connect
@ -360,7 +358,7 @@ class BlockHeaderInterface(PrintError):
return 'join'
else:
if ismocking and branch['parent']['check'](header) or not ismocking and branch.parent().check_header(header):
self.print_error('reorg', bad, self.tip)
self.print_error('reorg', bad, self.iface.tip)
self.iface.blockchain = branch.parent() if not ismocking else branch['parent']
self.height = bad
header = await self.conn.get_block_header(self.height, 'binary')
@ -394,7 +392,7 @@ class BlockHeaderInterface(PrintError):
return 'fork'
else:
assert bh == good
if bh < self.tip:
if bh < self.iface.tip:
self.print_error("catching up from %d"% (bh + 1))
self.height = bh + 1
return 'no_fork'

15
electrum/tests/test_network.py
View file

@ -30,6 +30,7 @@ class TestNetwork(unittest.TestCase):
class FakeIface:
blockchain = b
network = FakeNetwork
tip = 12
return FakeIface
def test_new_fork(self):
@ -43,7 +44,7 @@ class TestNetwork(unittest.TestCase):
conn.q.put_nowait({'block_height': 4, 'mock': {'binary':1,'check':lambda x: True, 'connect': lambda x: True}})
conn.q.put_nowait({'block_height': 5, 'mock': {'binary':1,'check':lambda x: True, 'connect': lambda x: True}})
conn.q.put_nowait({'block_height': 6, 'mock': {'binary':1,'check':lambda x: True, 'connect': lambda x: True}})
ifa = BlockHeaderInterface(conn, 12, 8, self.blockchain_iface_pair())
ifa = BlockHeaderInterface(conn, 8, self.blockchain_iface_pair())
self.assertEqual('fork', asyncio.get_event_loop().run_until_complete(ifa.sync_until(next_height=8)))
self.assertEqual(conn.q.qsize(), 0)
@ -57,7 +58,7 @@ class TestNetwork(unittest.TestCase):
conn.q.put_nowait({'block_height': 2, 'mock': {'backward':1, 'check': lambda x: False, 'connect': mock_connect, 'fork': self.mock_fork}})
conn.q.put_nowait({'block_height': 3, 'mock': {'catchup':1, 'check': lambda x: False, 'connect': lambda x: True}})
conn.q.put_nowait({'block_height': 4, 'mock': {'catchup':1, 'check': lambda x: False, 'connect': lambda x: True}})
ifa = BlockHeaderInterface(conn, 12, 8, self.blockchain_iface_pair())
ifa = BlockHeaderInterface(conn, 8, self.blockchain_iface_pair())
self.assertEqual('catchup', asyncio.get_event_loop().run_until_complete(ifa.sync_until(next_height=5)))
self.assertEqual(conn.q.qsize(), 0)
@ -73,9 +74,9 @@ class TestNetwork(unittest.TestCase):
conn.q.put_nowait({'block_height': 2, 'mock': {'backward':1, 'check': lambda x: True, 'connect': mock_connect}})
conn.q.put_nowait({'block_height': 4, 'mock': {'binary':1, 'check': lambda x: False, 'fork': self.mock_fork, 'connect': mock_connect}})
conn.q.put_nowait({'block_height': 3, 'mock': {'binary':1, 'check': lambda x: True, 'connect': lambda x: True}})
conn.q.put_nowait({'block_height': 5, 'mock': {'catchup':1, 'check': lambda x: True, 'connect': lambda x: True}})
conn.q.put_nowait({'block_height': 6, 'mock': {'catchup':1, 'check': lambda x: True, 'connect': lambda x: True}})
ifa = BlockHeaderInterface(conn, 12, 8, self.blockchain_iface_pair(1000))
conn.q.put_nowait({'block_height': 5, 'mock': {'catchup':1, 'check': lambda x: False, 'connect': lambda x: True}})
conn.q.put_nowait({'block_height': 6, 'mock': {'catchup':1, 'check': lambda x: False, 'connect': lambda x: True}})
ifa = BlockHeaderInterface(conn, 8, self.blockchain_iface_pair(1000))
self.assertEqual('catchup', asyncio.get_event_loop().run_until_complete(ifa.sync_until(next_height=7)))
self.assertEqual(conn.q.qsize(), 0)
@ -88,7 +89,7 @@ class TestNetwork(unittest.TestCase):
conn.q.put_nowait({'block_height': 4, 'mock': {'binary':1, 'check': lambda x: True, 'connect': lambda x: False}})
conn.q.put_nowait({'block_height': 5, 'mock': {'binary':1, 'check': lambda x: True, 'connect': lambda x: False}})
conn.q.put_nowait({'block_height': 6, 'mock': {'binary':1, 'check': lambda x: True, 'connect': lambda x: True}})
ifa = BlockHeaderInterface(conn, 12, 8, self.blockchain_iface_pair())
ifa = BlockHeaderInterface(conn, 8, self.blockchain_iface_pair())
self.assertEqual('join', asyncio.get_event_loop().run_until_complete(ifa.sync_until(next_height=7)))
self.assertEqual(conn.q.qsize(), 0)
@ -108,7 +109,7 @@ class TestNetwork(unittest.TestCase):
conn.q.put_nowait({'block_height': 5, 'mock': {'binary':1, 'check': lambda x: 1, 'connect': lambda x: False}})
conn.q.put_nowait({'block_height': 6, 'mock': {'binary':1, 'check': lambda x: 1, 'connect': lambda x: True}})
conn.q.put_nowait({'block_height': 7, 'mock': {'binary':1, 'check': lambda x: False, 'connect': lambda x: True}})
ifa = BlockHeaderInterface(conn, 12, 8, self.blockchain_iface_pair())
ifa = BlockHeaderInterface(conn, 8, self.blockchain_iface_pair())
self.assertEqual('join', asyncio.get_event_loop().run_until_complete(ifa.sync_until(next_height=8)))
self.assertEqual(conn.q.qsize(), 0)
self.assertEqual(times, 2)