test/functional/maxuploadtarget.py

   1 #!/usr/bin/env python3
   2 # Copyright (c) 2015-2016 The Bitcoin Core developers
   3 # Distributed under the MIT software license, see the accompanying
   4 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5 """Test behavior of -maxuploadtarget.
   6
   7 * Verify that getdata requests for old blocks (>1week) are dropped
   8 if uploadtarget has been reached.
   9 * Verify that getdata requests for recent blocks are respecteved even
  10 if uploadtarget has been reached.
  11 * Verify that the upload counters are reset after 24 hours.
  12 """
  13 from collections import defaultdict
  14 import time
  15
  16 from test_framework.mininode import *
  17 from test_framework.test_framework import BitcoinTestFramework
  18 from test_framework.util import *
  19
  20 class TestNode(P2PInterface):
  21     def __init__(self):
  22         super().__init__()
  23         self.block_receive_map = defaultdict(int)
  24
  25     def on_inv(self, message):
  26         pass
  27
  28     def on_block(self, message):
  29         message.block.calc_sha256()
  30         self.block_receive_map[message.block.sha256] += 1
  31
  32 class MaxUploadTest(BitcoinTestFramework):
  33
  34     def set_test_params(self):
  35         self.setup_clean_chain = True
  36         self.num_nodes = 1
  37         self.extra_args = [["-maxuploadtarget=800", "-blockmaxsize=999000"]]
  38
  39         # Cache for utxos, as the listunspent may take a long time later in the test
  40         self.utxo_cache = []
  41
  42     def run_test(self):
  43         # Before we connect anything, we first set the time on the node
  44         # to be in the past, otherwise things break because the CNode
  45         # time counters can't be reset backward after initialization
  46         old_time = int(time.time() - 2*60*60*24*7)
  47         self.nodes[0].setmocktime(old_time)
  48
  49         # Generate some old blocks
  50         self.nodes[0].generate(130)
  51
  52         # p2p_conns[0] will only request old blocks
  53         # p2p_conns[1] will only request new blocks
  54         # p2p_conns[2] will test resetting the counters
  55         p2p_conns = []
  56
  57         for _ in range(3):
  58             p2p_conns.append(self.nodes[0].add_p2p_connection(TestNode()))
  59
  60         network_thread_start()
  61         for p2pc in p2p_conns:
  62             p2pc.wait_for_verack()
  63
  64         # Test logic begins here
  65
  66         # Now mine a big block
  67         mine_large_block(self.nodes[0], self.utxo_cache)
  68
  69         # Store the hash; we'll request this later
  70         big_old_block = self.nodes[0].getbestblockhash()
  71         old_block_size = self.nodes[0].getblock(big_old_block, True)['size']
  72         big_old_block = int(big_old_block, 16)
  73
  74         # Advance to two days ago
  75         self.nodes[0].setmocktime(int(time.time()) - 2*60*60*24)
  76
  77         # Mine one more block, so that the prior block looks old
  78         mine_large_block(self.nodes[0], self.utxo_cache)
  79
  80         # We'll be requesting this new block too
  81         big_new_block = self.nodes[0].getbestblockhash()
  82         big_new_block = int(big_new_block, 16)
  83
  84         # p2p_conns[0] will test what happens if we just keep requesting the
  85         # the same big old block too many times (expect: disconnect)
  86
  87         getdata_request = msg_getdata()
  88         getdata_request.inv.append(CInv(2, big_old_block))
  89
  90         max_bytes_per_day = 800*1024*1024
  91         daily_buffer = 144 * 4000000
  92         max_bytes_available = max_bytes_per_day - daily_buffer
  93         success_count = max_bytes_available // old_block_size
  94
  95         # 576MB will be reserved for relaying new blocks, so expect this to
  96         # succeed for ~235 tries.
  97         for i in range(success_count):
  98             p2p_conns[0].send_message(getdata_request)
  99             p2p_conns[0].sync_with_ping()
 100             assert_equal(p2p_conns[0].block_receive_map[big_old_block], i+1)
 101
 102         assert_equal(len(self.nodes[0].getpeerinfo()), 3)
 103         # At most a couple more tries should succeed (depending on how long
 104         # the test has been running so far).
 105         for i in range(3):
 106             p2p_conns[0].send_message(getdata_request)
 107         p2p_conns[0].wait_for_disconnect()
 108         assert_equal(len(self.nodes[0].getpeerinfo()), 2)
 109         self.log.info("Peer 0 disconnected after downloading old block too many times")
 110
 111         # Requesting the current block on p2p_conns[1] should succeed indefinitely,
 112         # even when over the max upload target.
 113         # We'll try 800 times
 114         getdata_request.inv = [CInv(2, big_new_block)]
 115         for i in range(800):
 116             p2p_conns[1].send_message(getdata_request)
 117             p2p_conns[1].sync_with_ping()
 118             assert_equal(p2p_conns[1].block_receive_map[big_new_block], i+1)
 119
 120         self.log.info("Peer 1 able to repeatedly download new block")
 121
 122         # But if p2p_conns[1] tries for an old block, it gets disconnected too.
 123         getdata_request.inv = [CInv(2, big_old_block)]
 124         p2p_conns[1].send_message(getdata_request)
 125         p2p_conns[1].wait_for_disconnect()
 126         assert_equal(len(self.nodes[0].getpeerinfo()), 1)
 127
 128         self.log.info("Peer 1 disconnected after trying to download old block")
 129
 130         self.log.info("Advancing system time on node to clear counters...")
 131
 132         # If we advance the time by 24 hours, then the counters should reset,
 133         # and p2p_conns[2] should be able to retrieve the old block.
 134         self.nodes[0].setmocktime(int(time.time()))
 135         p2p_conns[2].sync_with_ping()
 136         p2p_conns[2].send_message(getdata_request)
 137         p2p_conns[2].sync_with_ping()
 138         assert_equal(p2p_conns[2].block_receive_map[big_old_block], 1)
 139
 140         self.log.info("Peer 2 able to download old block")
 141
 142         self.nodes[0].disconnect_p2ps()
 143
 144         #stop and start node 0 with 1MB maxuploadtarget, whitelist 127.0.0.1
 145         self.log.info("Restarting nodes with -whitelist=127.0.0.1")
 146         self.stop_node(0)
 147         self.start_node(0, ["-whitelist=127.0.0.1", "-maxuploadtarget=1", "-blockmaxsize=999000"])
 148
 149         # Reconnect to self.nodes[0]
 150         self.nodes[0].add_p2p_connection(TestNode())
 151
 152         network_thread_start()
 153         self.nodes[0].p2p.wait_for_verack()
 154
 155         #retrieve 20 blocks which should be enough to break the 1MB limit
 156         getdata_request.inv = [CInv(2, big_new_block)]
 157         for i in range(20):
 158             self.nodes[0].p2p.send_message(getdata_request)
 159             self.nodes[0].p2p.sync_with_ping()
 160             assert_equal(self.nodes[0].p2p.block_receive_map[big_new_block], i+1)
 161
 162         getdata_request.inv = [CInv(2, big_old_block)]
 163         self.nodes[0].p2p.send_and_ping(getdata_request)
 164         assert_equal(len(self.nodes[0].getpeerinfo()), 1) #node is still connected because of the whitelist
 165
 166         self.log.info("Peer still connected after trying to download old block (whitelisted)")
 167
 168 if __name__ == '__main__':
 169     MaxUploadTest().main()