160 lines
6.1 KiB
Python
Executable file
160 lines
6.1 KiB
Python
Executable file
#!/usr/bin/env python2
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# Copyright (c) 2016 The Bitcoin Core developers
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# Distributed under the MIT/X11 software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#
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from test_framework.mininode import *
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import *
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import time
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from test_framework.blocktools import create_block, create_coinbase
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'''
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Test version bits' warning system.
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Generate chains with block versions that appear to be signalling unknown
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soft-forks, and test that warning alerts are generated.
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'''
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VB_PERIOD = 144 # versionbits period length for regtest
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VB_THRESHOLD = 108 # versionbits activation threshold for regtest
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VB_TOP_BITS = 0x20000000
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VB_UNKNOWN_BIT = 27 # Choose a bit unassigned to any deployment
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# TestNode: bare-bones "peer". Used mostly as a conduit for a test to sending
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# p2p messages to a node, generating the messages in the main testing logic.
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class TestNode(NodeConnCB):
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def __init__(self):
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NodeConnCB.__init__(self)
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self.connection = None
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self.ping_counter = 1
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self.last_pong = msg_pong()
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def add_connection(self, conn):
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self.connection = conn
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def on_inv(self, conn, message):
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pass
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# Wrapper for the NodeConn's send_message function
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def send_message(self, message):
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self.connection.send_message(message)
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def on_pong(self, conn, message):
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self.last_pong = message
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# Sync up with the node after delivery of a block
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def sync_with_ping(self, timeout=30):
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self.connection.send_message(msg_ping(nonce=self.ping_counter))
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received_pong = False
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sleep_time = 0.05
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while not received_pong and timeout > 0:
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time.sleep(sleep_time)
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timeout -= sleep_time
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with mininode_lock:
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if self.last_pong.nonce == self.ping_counter:
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received_pong = True
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self.ping_counter += 1
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return received_pong
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class VersionBitsWarningTest(BitcoinTestFramework):
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def setup_chain(self):
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initialize_chain_clean(self.options.tmpdir, 1)
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def setup_network(self):
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self.nodes = []
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self.alert_filename = os.path.join(self.options.tmpdir, "alert.txt")
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# Open and close to create zero-length file
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with open(self.alert_filename, 'w') as f:
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pass
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self.node_options = ["-debug", "-logtimemicros=1", "-alertnotify=echo %s >> \"" + self.alert_filename + "\""]
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self.nodes.append(start_node(0, self.options.tmpdir, self.node_options))
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import re
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self.vb_pattern = re.compile("^Warning.*versionbit")
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# Send numblocks blocks via peer with nVersionToUse set.
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def send_blocks_with_version(self, peer, numblocks, nVersionToUse):
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tip = self.nodes[0].getbestblockhash()
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height = self.nodes[0].getblockcount()
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block_time = self.nodes[0].getblockheader(tip)["time"]+1
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tip = int(tip, 16)
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for i in xrange(numblocks):
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block = create_block(tip, create_coinbase(height+1), block_time)
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block.nVersion = nVersionToUse
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block.solve()
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peer.send_message(msg_block(block))
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block_time += 1
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height += 1
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tip = block.sha256
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peer.sync_with_ping()
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def test_versionbits_in_alert_file(self):
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with open(self.alert_filename, 'r') as f:
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alert_text = f.read()
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assert(self.vb_pattern.match(alert_text))
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def run_test(self):
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# Setup the p2p connection and start up the network thread.
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test_node = TestNode()
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connections = []
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connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], test_node))
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test_node.add_connection(connections[0])
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NetworkThread().start() # Start up network handling in another thread
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# Test logic begins here
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test_node.wait_for_verack()
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# 1. Have the node mine one period worth of blocks
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self.nodes[0].generate(VB_PERIOD)
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# 2. Now build one period of blocks on the tip, with < VB_THRESHOLD
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# blocks signaling some unknown bit.
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nVersion = VB_TOP_BITS | (1<<VB_UNKNOWN_BIT)
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self.send_blocks_with_version(test_node, VB_THRESHOLD-1, nVersion)
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# Fill rest of period with regular version blocks
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self.nodes[0].generate(VB_PERIOD - VB_THRESHOLD + 1)
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# Check that we're not getting any versionbit-related errors in
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# getinfo()
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assert(not self.vb_pattern.match(self.nodes[0].getinfo()["errors"]))
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# 3. Now build one period of blocks with >= VB_THRESHOLD blocks signaling
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# some unknown bit
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self.send_blocks_with_version(test_node, VB_THRESHOLD, nVersion)
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self.nodes[0].generate(VB_PERIOD - VB_THRESHOLD)
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# Might not get a versionbits-related alert yet, as we should
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# have gotten a different alert due to more than 51/100 blocks
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# being of unexpected version.
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# Check that getinfo() shows some kind of error.
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assert(len(self.nodes[0].getinfo()["errors"]) != 0)
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# Mine a period worth of expected blocks so the generic block-version warning
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# is cleared, and restart the node. This should move the versionbit state
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# to ACTIVE.
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self.nodes[0].generate(VB_PERIOD)
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stop_node(self.nodes[0], 0)
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wait_bitcoinds()
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# Empty out the alert file
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with open(self.alert_filename, 'w') as f:
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pass
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self.nodes[0] = start_node(0, self.options.tmpdir, ["-debug", "-logtimemicros=1", "-alertnotify=echo %s >> \"" + self.alert_filename + "\""])
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# Connecting one block should be enough to generate an error.
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self.nodes[0].generate(1)
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assert(len(self.nodes[0].getinfo()["errors"]) != 0)
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stop_node(self.nodes[0], 0)
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wait_bitcoinds()
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self.test_versionbits_in_alert_file()
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# Test framework expects the node to still be running...
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self.nodes[0] = start_node(0, self.options.tmpdir, ["-debug", "-logtimemicros=1", "-alertnotify=echo %s >> \"" + self.alert_filename + "\""])
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if __name__ == '__main__':
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VersionBitsWarningTest().main()
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