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#!/usr/bin/env python3
# Copyright (c) 2015-2016 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test behavior of -maxuploadtarget.
* Verify that getdata requests for old blocks (>1week) are dropped
if uploadtarget has been reached.
* Verify that getdata requests for recent blocks are respecteved even
if uploadtarget has been reached.
* Verify that the upload counters are reset after 24 hours.
"""
from test_framework.mininode import *
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import *
import time
# TestNode: bare-bones "peer". Used mostly as a conduit for a test to sending
# p2p messages to a node, generating the messages in the main testing logic.
class TestNode(NodeConnCB):
def __init__(self):
super().__init__()
self.connection = None
self.ping_counter = 1
self.last_pong = msg_pong()
self.block_receive_map = {}
def add_connection(self, conn):
self.connection = conn
self.peer_disconnected = False
def on_inv(self, conn, message):
pass
# Track the last getdata message we receive (used in the test)
def on_getdata(self, conn, message):
self.last_getdata = message
def on_block(self, conn, message):
message.block.calc_sha256()
try:
self.block_receive_map[message.block.sha256] += 1
except KeyError as e:
self.block_receive_map[message.block.sha256] = 1
# Spin until verack message is received from the node.
# We use this to signal that our test can begin. This
# is called from the testing thread, so it needs to acquire
# the global lock.
def wait_for_verack(self):
def veracked():
return self.verack_received
return wait_until(veracked, timeout=10)
def wait_for_disconnect(self):
def disconnected():
return self.peer_disconnected
return wait_until(disconnected, timeout=10)
# Wrapper for the NodeConn's send_message function
def send_message(self, message):
self.connection.send_message(message)
def on_pong(self, conn, message):
self.last_pong = message
def on_close(self, conn):
self.peer_disconnected = True
# Sync up with the node after delivery of a block
def sync_with_ping(self, timeout=30):
def received_pong():
return (self.last_pong.nonce == self.ping_counter)
self.connection.send_message(msg_ping(nonce=self.ping_counter))
success = wait_until(received_pong, timeout=timeout)
self.ping_counter += 1
return success
class MaxUploadTest(BitcoinTestFramework):
def __init__(self):
super().__init__()
self.setup_clean_chain = True
self.num_nodes = 1
# Cache for utxos, as the listunspent may take a long time later in the test
self.utxo_cache = []
def setup_network(self):
# Start a node with maxuploadtarget of 200 MB (/24h)
self.nodes = []
self.nodes.append(start_node(0, self.options.tmpdir, ["-maxuploadtarget=800", "-blockmaxsize=999000"]))
def run_test(self):
# Before we connect anything, we first set the time on the node
# to be in the past, otherwise things break because the CNode
# time counters can't be reset backward after initialization
old_time = int(time.time() - 2*60*60*24*7)
self.nodes[0].setmocktime(old_time)
# Generate some old blocks
self.nodes[0].generate(130)
# test_nodes[0] will only request old blocks
# test_nodes[1] will only request new blocks
# test_nodes[2] will test resetting the counters
test_nodes = []
connections = []
for i in range(3):
test_nodes.append(TestNode())
connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], test_nodes[i]))
test_nodes[i].add_connection(connections[i])
NetworkThread().start() # Start up network handling in another thread
[x.wait_for_verack() for x in test_nodes]
# Test logic begins here
# Now mine a big block
mine_large_block(self.nodes[0], self.utxo_cache)
# Store the hash; we'll request this later
big_old_block = self.nodes[0].getbestblockhash()
old_block_size = self.nodes[0].getblock(big_old_block, True)['size']
big_old_block = int(big_old_block, 16)
# Advance to two days ago
self.nodes[0].setmocktime(int(time.time()) - 2*60*60*24)
# Mine one more block, so that the prior block looks old
mine_large_block(self.nodes[0], self.utxo_cache)
# We'll be requesting this new block too
big_new_block = self.nodes[0].getbestblockhash()
big_new_block = int(big_new_block, 16)
# test_nodes[0] will test what happens if we just keep requesting the
# the same big old block too many times (expect: disconnect)
getdata_request = msg_getdata()
getdata_request.inv.append(CInv(2, big_old_block))
max_bytes_per_day = 800*1024*1024
daily_buffer = 144 * 4000000
max_bytes_available = max_bytes_per_day - daily_buffer
success_count = max_bytes_available // old_block_size
# 576MB will be reserved for relaying new blocks, so expect this to
# succeed for ~235 tries.
for i in range(success_count):
test_nodes[0].send_message(getdata_request)
test_nodes[0].sync_with_ping()
assert_equal(test_nodes[0].block_receive_map[big_old_block], i+1)
assert_equal(len(self.nodes[0].getpeerinfo()), 3)
# At most a couple more tries should succeed (depending on how long
# the test has been running so far).
for i in range(3):
test_nodes[0].send_message(getdata_request)
test_nodes[0].wait_for_disconnect()
assert_equal(len(self.nodes[0].getpeerinfo()), 2)
self.log.info("Peer 0 disconnected after downloading old block too many times")
# Requesting the current block on test_nodes[1] should succeed indefinitely,
# even when over the max upload target.
# We'll try 800 times
getdata_request.inv = [CInv(2, big_new_block)]
for i in range(800):
test_nodes[1].send_message(getdata_request)
test_nodes[1].sync_with_ping()
assert_equal(test_nodes[1].block_receive_map[big_new_block], i+1)
self.log.info("Peer 1 able to repeatedly download new block")
# But if test_nodes[1] tries for an old block, it gets disconnected too.
getdata_request.inv = [CInv(2, big_old_block)]
test_nodes[1].send_message(getdata_request)
test_nodes[1].wait_for_disconnect()
assert_equal(len(self.nodes[0].getpeerinfo()), 1)
self.log.info("Peer 1 disconnected after trying to download old block")
self.log.info("Advancing system time on node to clear counters...")
# If we advance the time by 24 hours, then the counters should reset,
# and test_nodes[2] should be able to retrieve the old block.
self.nodes[0].setmocktime(int(time.time()))
test_nodes[2].sync_with_ping()
test_nodes[2].send_message(getdata_request)
test_nodes[2].sync_with_ping()
assert_equal(test_nodes[2].block_receive_map[big_old_block], 1)
self.log.info("Peer 2 able to download old block")
[c.disconnect_node() for c in connections]
#stop and start node 0 with 1MB maxuploadtarget, whitelist 127.0.0.1
self.log.info("Restarting nodes with -whitelist=127.0.0.1")
stop_node(self.nodes[0], 0)
self.nodes[0] = start_node(0, self.options.tmpdir, ["-whitelist=127.0.0.1", "-maxuploadtarget=1", "-blockmaxsize=999000"])
#recreate/reconnect 3 test nodes
test_nodes = []
connections = []
for i in range(3):
test_nodes.append(TestNode())
connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], test_nodes[i]))
test_nodes[i].add_connection(connections[i])
NetworkThread().start() # Start up network handling in another thread
[x.wait_for_verack() for x in test_nodes]
#retrieve 20 blocks which should be enough to break the 1MB limit
getdata_request.inv = [CInv(2, big_new_block)]
for i in range(20):
test_nodes[1].send_message(getdata_request)
test_nodes[1].sync_with_ping()
assert_equal(test_nodes[1].block_receive_map[big_new_block], i+1)
getdata_request.inv = [CInv(2, big_old_block)]
test_nodes[1].send_message(getdata_request)
test_nodes[1].wait_for_disconnect()
assert_equal(len(self.nodes[0].getpeerinfo()), 3) #node is still connected because of the whitelist
self.log.info("Peer 1 still connected after trying to download old block (whitelisted)")
[c.disconnect_node() for c in connections]
if __name__ == '__main__':
MaxUploadTest().main()
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