#!/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 collections import defaultdict import time from test_framework.mininode import * from test_framework.test_framework import BitcoinTestFramework from test_framework.util import * class TestNode(NodeConnCB): def __init__(self): super().__init__() self.block_receive_map = defaultdict(int) def on_inv(self, conn, message): pass def on_block(self, conn, message): message.block.calc_sha256() self.block_receive_map[message.block.sha256] += 1 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 a test node test_nodes = [TestNode()] connections = [NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], test_nodes[0])] test_nodes[0].add_connection(connections[0]) NetworkThread().start() # Start up network handling in another thread test_nodes[0].wait_for_verack() #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[0].send_message(getdata_request) test_nodes[0].sync_with_ping() assert_equal(test_nodes[0].block_receive_map[big_new_block], i+1) getdata_request.inv = [CInv(2, big_old_block)] test_nodes[0].send_and_ping(getdata_request) assert_equal(len(self.nodes[0].getpeerinfo()), 1) #node is still connected because of the whitelist self.log.info("Peer still connected after trying to download old block (whitelisted)") if __name__ == '__main__': MaxUploadTest().main()