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308 lines
13 KiB
308 lines
13 KiB
#!/usr/bin/env python3
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# Copyright (c) 2015-2018 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Test processing of unrequested blocks.
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Setup: two nodes, node0+node1, not connected to each other. Node1 will have
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nMinimumChainWork set to 0x10, so it won't process low-work unrequested blocks.
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We have one P2PInterface connection to node0 called test_node, and one to node1
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called min_work_node.
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The test:
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1. Generate one block on each node, to leave IBD.
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2. Mine a new block on each tip, and deliver to each node from node's peer.
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The tip should advance for node0, but node1 should skip processing due to
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nMinimumChainWork.
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Node1 is unused in tests 3-7:
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3. Mine a block that forks from the genesis block, and deliver to test_node.
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Node0 should not process this block (just accept the header), because it
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is unrequested and doesn't have more or equal work to the tip.
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4a,b. Send another two blocks that build on the forking block.
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Node0 should process the second block but be stuck on the shorter chain,
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because it's missing an intermediate block.
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4c.Send 288 more blocks on the longer chain (the number of blocks ahead
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we currently store).
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Node0 should process all but the last block (too far ahead in height).
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5. Send a duplicate of the block in #3 to Node0.
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Node0 should not process the block because it is unrequested, and stay on
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the shorter chain.
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6. Send Node0 an inv for the height 3 block produced in #4 above.
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Node0 should figure out that Node0 has the missing height 2 block and send a
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getdata.
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7. Send Node0 the missing block again.
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Node0 should process and the tip should advance.
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8. Create a fork which is invalid at a height longer than the current chain
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(ie to which the node will try to reorg) but which has headers built on top
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of the invalid block. Check that we get disconnected if we send more headers
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on the chain the node now knows to be invalid.
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9. Test Node1 is able to sync when connected to node0 (which should have sufficient
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work on its chain).
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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, create_tx_with_script
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class AcceptBlockTest(BitcoinTestFramework):
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def set_test_params(self):
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self.setup_clean_chain = True
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self.num_nodes = 2
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self.extra_args = [[], ["-minimumchainwork=0x10"]]
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def setup_network(self):
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# Node0 will be used to test behavior of processing unrequested blocks
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# from peers which are not whitelisted, while Node1 will be used for
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# the whitelisted case.
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# Node2 will be used for non-whitelisted peers to test the interaction
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# with nMinimumChainWork.
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self.setup_nodes()
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def run_test(self):
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# Setup the p2p connections
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# test_node connects to node0 (not whitelisted)
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test_node = self.nodes[0].add_p2p_connection(P2PInterface())
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# min_work_node connects to node1 (whitelisted)
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min_work_node = self.nodes[1].add_p2p_connection(P2PInterface())
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# 1. Have nodes mine a block (leave IBD)
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[ n.generate(1) for n in self.nodes ]
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tips = [ int("0x" + n.getbestblockhash(), 0) for n in self.nodes ]
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# 2. Send one block that builds on each tip.
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# This should be accepted by node0
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blocks_h2 = [] # the height 2 blocks on each node's chain
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block_time = int(time.time()) + 1
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for i in range(2):
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blocks_h2.append(create_block(tips[i], create_coinbase(2), block_time))
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blocks_h2[i].solve()
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block_time += 1
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test_node.send_message(msg_block(blocks_h2[0]))
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min_work_node.send_message(msg_block(blocks_h2[1]))
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for x in [test_node, min_work_node]:
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x.sync_with_ping()
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assert_equal(self.nodes[0].getblockcount(), 2)
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assert_equal(self.nodes[1].getblockcount(), 1)
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self.log.info("First height 2 block accepted by node0; correctly rejected by node1")
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# 3. Send another block that builds on genesis.
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block_h1f = create_block(int("0x" + self.nodes[0].getblockhash(0), 0), create_coinbase(1), block_time)
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block_time += 1
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block_h1f.solve()
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test_node.send_message(msg_block(block_h1f))
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test_node.sync_with_ping()
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tip_entry_found = False
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for x in self.nodes[0].getchaintips():
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if x['hash'] == block_h1f.hash:
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assert_equal(x['status'], "headers-only")
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tip_entry_found = True
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assert(tip_entry_found)
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assert_raises_rpc_error(-1, "Block not found on disk", self.nodes[0].getblock, block_h1f.hash)
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# 4. Send another two block that build on the fork.
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block_h2f = create_block(block_h1f.sha256, create_coinbase(2), block_time)
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block_time += 1
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block_h2f.solve()
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test_node.send_message(msg_block(block_h2f))
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test_node.sync_with_ping()
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# Since the earlier block was not processed by node, the new block
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# can't be fully validated.
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tip_entry_found = False
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for x in self.nodes[0].getchaintips():
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if x['hash'] == block_h2f.hash:
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assert_equal(x['status'], "headers-only")
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tip_entry_found = True
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assert(tip_entry_found)
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# But this block should be accepted by node since it has equal work.
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self.nodes[0].getblock(block_h2f.hash)
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self.log.info("Second height 2 block accepted, but not reorg'ed to")
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# 4b. Now send another block that builds on the forking chain.
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block_h3 = create_block(block_h2f.sha256, create_coinbase(3), block_h2f.nTime+1)
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block_h3.solve()
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test_node.send_message(msg_block(block_h3))
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test_node.sync_with_ping()
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# Since the earlier block was not processed by node, the new block
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# can't be fully validated.
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tip_entry_found = False
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for x in self.nodes[0].getchaintips():
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if x['hash'] == block_h3.hash:
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assert_equal(x['status'], "headers-only")
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tip_entry_found = True
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assert(tip_entry_found)
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self.nodes[0].getblock(block_h3.hash)
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# But this block should be accepted by node since it has more work.
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self.nodes[0].getblock(block_h3.hash)
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self.log.info("Unrequested more-work block accepted")
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# 4c. Now mine 288 more blocks and deliver; all should be processed but
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# the last (height-too-high) on node (as long as it is not missing any headers)
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tip = block_h3
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all_blocks = []
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for i in range(288):
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next_block = create_block(tip.sha256, create_coinbase(i + 4), tip.nTime+1)
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next_block.solve()
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all_blocks.append(next_block)
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tip = next_block
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# Now send the block at height 5 and check that it wasn't accepted (missing header)
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test_node.send_message(msg_block(all_blocks[1]))
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test_node.sync_with_ping()
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assert_raises_rpc_error(-5, "Block not found", self.nodes[0].getblock, all_blocks[1].hash)
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assert_raises_rpc_error(-5, "Block not found", self.nodes[0].getblockheader, all_blocks[1].hash)
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# The block at height 5 should be accepted if we provide the missing header, though
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headers_message = msg_headers()
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headers_message.headers.append(CBlockHeader(all_blocks[0]))
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test_node.send_message(headers_message)
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test_node.send_message(msg_block(all_blocks[1]))
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test_node.sync_with_ping()
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self.nodes[0].getblock(all_blocks[1].hash)
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# Now send the blocks in all_blocks
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for i in range(288):
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test_node.send_message(msg_block(all_blocks[i]))
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test_node.sync_with_ping()
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# Blocks 1-287 should be accepted, block 288 should be ignored because it's too far ahead
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for x in all_blocks[:-1]:
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self.nodes[0].getblock(x.hash)
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assert_raises_rpc_error(-1, "Block not found on disk", self.nodes[0].getblock, all_blocks[-1].hash)
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# 5. Test handling of unrequested block on the node that didn't process
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# Should still not be processed (even though it has a child that has more
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# work).
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# The node should have requested the blocks at some point, so
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# disconnect/reconnect first
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self.nodes[0].disconnect_p2ps()
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self.nodes[1].disconnect_p2ps()
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test_node = self.nodes[0].add_p2p_connection(P2PInterface())
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test_node.send_message(msg_block(block_h1f))
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test_node.sync_with_ping()
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assert_equal(self.nodes[0].getblockcount(), 2)
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self.log.info("Unrequested block that would complete more-work chain was ignored")
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# 6. Try to get node to request the missing block.
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# Poke the node with an inv for block at height 3 and see if that
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# triggers a getdata on block 2 (it should if block 2 is missing).
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with mininode_lock:
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# Clear state so we can check the getdata request
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test_node.last_message.pop("getdata", None)
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test_node.send_message(msg_inv([CInv(2, block_h3.sha256)]))
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test_node.sync_with_ping()
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with mininode_lock:
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getdata = test_node.last_message["getdata"]
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# Check that the getdata includes the right block
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assert_equal(getdata.inv[0].hash, block_h1f.sha256)
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self.log.info("Inv at tip triggered getdata for unprocessed block")
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# 7. Send the missing block for the third time (now it is requested)
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test_node.send_message(msg_block(block_h1f))
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test_node.sync_with_ping()
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assert_equal(self.nodes[0].getblockcount(), 290)
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self.nodes[0].getblock(all_blocks[286].hash)
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assert_equal(self.nodes[0].getbestblockhash(), all_blocks[286].hash)
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assert_raises_rpc_error(-1, "Block not found on disk", self.nodes[0].getblock, all_blocks[287].hash)
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self.log.info("Successfully reorged to longer chain from non-whitelisted peer")
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# 8. Create a chain which is invalid at a height longer than the
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# current chain, but which has more blocks on top of that
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block_289f = create_block(all_blocks[284].sha256, create_coinbase(289), all_blocks[284].nTime+1)
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block_289f.solve()
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block_290f = create_block(block_289f.sha256, create_coinbase(290), block_289f.nTime+1)
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block_290f.solve()
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block_291 = create_block(block_290f.sha256, create_coinbase(291), block_290f.nTime+1)
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# block_291 spends a coinbase below maturity!
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block_291.vtx.append(create_tx_with_script(block_290f.vtx[0], 0, script_sig=b"42", amount=1))
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block_291.hashMerkleRoot = block_291.calc_merkle_root()
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block_291.solve()
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block_292 = create_block(block_291.sha256, create_coinbase(292), block_291.nTime+1)
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block_292.solve()
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# Now send all the headers on the chain and enough blocks to trigger reorg
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headers_message = msg_headers()
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headers_message.headers.append(CBlockHeader(block_289f))
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headers_message.headers.append(CBlockHeader(block_290f))
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headers_message.headers.append(CBlockHeader(block_291))
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headers_message.headers.append(CBlockHeader(block_292))
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test_node.send_message(headers_message)
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test_node.sync_with_ping()
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tip_entry_found = False
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for x in self.nodes[0].getchaintips():
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if x['hash'] == block_292.hash:
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assert_equal(x['status'], "headers-only")
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tip_entry_found = True
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assert(tip_entry_found)
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assert_raises_rpc_error(-1, "Block not found on disk", self.nodes[0].getblock, block_292.hash)
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test_node.send_message(msg_block(block_289f))
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test_node.send_message(msg_block(block_290f))
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test_node.sync_with_ping()
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self.nodes[0].getblock(block_289f.hash)
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self.nodes[0].getblock(block_290f.hash)
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test_node.send_message(msg_block(block_291))
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# At this point we've sent an obviously-bogus block, wait for full processing
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# without assuming whether we will be disconnected or not
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try:
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# Only wait a short while so the test doesn't take forever if we do get
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# disconnected
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test_node.sync_with_ping(timeout=1)
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except AssertionError:
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test_node.wait_for_disconnect()
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self.nodes[0].disconnect_p2ps()
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test_node = self.nodes[0].add_p2p_connection(P2PInterface())
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# We should have failed reorg and switched back to 290 (but have block 291)
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assert_equal(self.nodes[0].getblockcount(), 290)
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assert_equal(self.nodes[0].getbestblockhash(), all_blocks[286].hash)
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assert_equal(self.nodes[0].getblock(block_291.hash)["confirmations"], -1)
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# Now send a new header on the invalid chain, indicating we're forked off, and expect to get disconnected
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block_293 = create_block(block_292.sha256, create_coinbase(293), block_292.nTime+1)
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block_293.solve()
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headers_message = msg_headers()
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headers_message.headers.append(CBlockHeader(block_293))
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test_node.send_message(headers_message)
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test_node.wait_for_disconnect()
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# 9. Connect node1 to node0 and ensure it is able to sync
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connect_nodes(self.nodes[0], 1)
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sync_blocks([self.nodes[0], self.nodes[1]])
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self.log.info("Successfully synced nodes 1 and 0")
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if __name__ == '__main__':
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AcceptBlockTest().main()
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