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460 lines
20 KiB
460 lines
20 KiB
3 years ago
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#!/usr/bin/env python3
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# Copyright (c) 2014-2020 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 the pruning code.
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WARNING:
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This test uses 4GB of disk space.
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This test takes 30 mins or more (up to 2 hours)
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"""
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import os
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from test_framework.blocktools import create_coinbase
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from test_framework.messages import CBlock
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from test_framework.script import (
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CScript,
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OP_NOP,
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OP_RETURN,
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)
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import (
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assert_equal,
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assert_greater_than,
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assert_raises_rpc_error,
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)
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# Rescans start at the earliest block up to 2 hours before a key timestamp, so
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# the manual prune RPC avoids pruning blocks in the same window to be
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# compatible with pruning based on key creation time.
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TIMESTAMP_WINDOW = 2 * 60 * 60
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def mine_large_blocks(node, n):
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# Make a large scriptPubKey for the coinbase transaction. This is OP_RETURN
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# followed by 950k of OP_NOP. This would be non-standard in a non-coinbase
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# transaction but is consensus valid.
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# Set the nTime if this is the first time this function has been called.
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# A static variable ensures that time is monotonicly increasing and is therefore
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# different for each block created => blockhash is unique.
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if "nTimes" not in mine_large_blocks.__dict__:
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mine_large_blocks.nTime = 0
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# Get the block parameters for the first block
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big_script = CScript([OP_RETURN] + [OP_NOP] * 950000)
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best_block = node.getblock(node.getbestblockhash())
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height = int(best_block["height"]) + 1
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mine_large_blocks.nTime = max(mine_large_blocks.nTime, int(best_block["time"])) + 1
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previousblockhash = int(best_block["hash"], 16)
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for _ in range(n):
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# Build the coinbase transaction (with large scriptPubKey)
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coinbase_tx = create_coinbase(height)
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coinbase_tx.vin[0].nSequence = 2 ** 32 - 1
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coinbase_tx.vout[0].scriptPubKey = big_script
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coinbase_tx.rehash()
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# Build the block
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block = CBlock()
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block.nVersion = best_block["version"]
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block.hashPrevBlock = previousblockhash
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block.nTime = mine_large_blocks.nTime
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block.nBits = int('207fffff', 16)
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block.nNonce = 0
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block.vtx = [coinbase_tx]
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block.hashMerkleRoot = block.calc_merkle_root()
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block.solve()
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# Submit to the node
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node.submitblock(block.serialize().hex())
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previousblockhash = block.sha256
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height += 1
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mine_large_blocks.nTime += 1
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def calc_usage(blockdir):
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return sum(os.path.getsize(blockdir + f) for f in os.listdir(blockdir) if os.path.isfile(os.path.join(blockdir, f))) / (1024. * 1024.)
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class PruneTest(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 = 6
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self.supports_cli = False
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# Create nodes 0 and 1 to mine.
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# Create node 2 to test pruning.
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self.full_node_default_args = ["-maxreceivebuffer=20000", "-checkblocks=5"]
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# Create nodes 3 and 4 to test manual pruning (they will be re-started with manual pruning later)
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# Create nodes 5 to test wallet in prune mode, but do not connect
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self.extra_args = [
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self.full_node_default_args,
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self.full_node_default_args,
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["-maxreceivebuffer=20000", "-prune=550"],
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["-maxreceivebuffer=20000"],
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["-maxreceivebuffer=20000"],
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["-prune=550"],
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]
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self.rpc_timeout = 120
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def skip_test_if_missing_module(self):
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self.skip_if_no_wallet()
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def setup_network(self):
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self.setup_nodes()
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self.prunedir = os.path.join(self.nodes[2].datadir, self.chain, 'blocks', '')
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self.connect_nodes(0, 1)
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self.connect_nodes(1, 2)
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self.connect_nodes(0, 2)
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self.connect_nodes(0, 3)
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self.connect_nodes(0, 4)
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self.sync_blocks(self.nodes[0:5])
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def setup_nodes(self):
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self.add_nodes(self.num_nodes, self.extra_args)
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self.start_nodes()
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self.import_deterministic_coinbase_privkeys()
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def create_big_chain(self):
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# Start by creating some coinbases we can spend later
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self.nodes[1].generate(200)
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self.sync_blocks(self.nodes[0:2])
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self.nodes[0].generate(150)
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# Then mine enough full blocks to create more than 550MiB of data
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mine_large_blocks(self.nodes[0], 645)
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self.sync_blocks(self.nodes[0:5])
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def test_height_min(self):
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assert os.path.isfile(os.path.join(self.prunedir, "blk00000.dat")), "blk00000.dat is missing, pruning too early"
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self.log.info("Success")
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self.log.info("Though we're already using more than 550MiB, current usage: %d" % calc_usage(self.prunedir))
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self.log.info("Mining 25 more blocks should cause the first block file to be pruned")
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# Pruning doesn't run until we're allocating another chunk, 20 full blocks past the height cutoff will ensure this
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mine_large_blocks(self.nodes[0], 25)
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# Wait for blk00000.dat to be pruned
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self.wait_until(lambda: not os.path.isfile(os.path.join(self.prunedir, "blk00000.dat")), timeout=30)
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self.log.info("Success")
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usage = calc_usage(self.prunedir)
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self.log.info("Usage should be below target: %d" % usage)
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assert_greater_than(550, usage)
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def create_chain_with_staleblocks(self):
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# Create stale blocks in manageable sized chunks
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self.log.info("Mine 24 (stale) blocks on Node 1, followed by 25 (main chain) block reorg from Node 0, for 12 rounds")
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for _ in range(12):
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# Disconnect node 0 so it can mine a longer reorg chain without knowing about node 1's soon-to-be-stale chain
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# Node 2 stays connected, so it hears about the stale blocks and then reorg's when node0 reconnects
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self.disconnect_nodes(0, 1)
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self.disconnect_nodes(0, 2)
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# Mine 24 blocks in node 1
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mine_large_blocks(self.nodes[1], 24)
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# Reorg back with 25 block chain from node 0
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mine_large_blocks(self.nodes[0], 25)
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# Create connections in the order so both nodes can see the reorg at the same time
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self.connect_nodes(0, 1)
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self.connect_nodes(0, 2)
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self.sync_blocks(self.nodes[0:3])
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self.log.info("Usage can be over target because of high stale rate: %d" % calc_usage(self.prunedir))
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def reorg_test(self):
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# Node 1 will mine a 300 block chain starting 287 blocks back from Node 0 and Node 2's tip
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# This will cause Node 2 to do a reorg requiring 288 blocks of undo data to the reorg_test chain
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height = self.nodes[1].getblockcount()
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self.log.info("Current block height: %d" % height)
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self.forkheight = height - 287
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self.forkhash = self.nodes[1].getblockhash(self.forkheight)
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self.log.info("Invalidating block %s at height %d" % (self.forkhash, self.forkheight))
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self.nodes[1].invalidateblock(self.forkhash)
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# We've now switched to our previously mined-24 block fork on node 1, but that's not what we want
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# So invalidate that fork as well, until we're on the same chain as node 0/2 (but at an ancestor 288 blocks ago)
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mainchainhash = self.nodes[0].getblockhash(self.forkheight - 1)
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curhash = self.nodes[1].getblockhash(self.forkheight - 1)
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while curhash != mainchainhash:
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self.nodes[1].invalidateblock(curhash)
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curhash = self.nodes[1].getblockhash(self.forkheight - 1)
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assert self.nodes[1].getblockcount() == self.forkheight - 1
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self.log.info("New best height: %d" % self.nodes[1].getblockcount())
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# Disconnect node1 and generate the new chain
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self.disconnect_nodes(0, 1)
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self.disconnect_nodes(1, 2)
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self.log.info("Generating new longer chain of 300 more blocks")
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self.nodes[1].generate(300)
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self.log.info("Reconnect nodes")
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self.connect_nodes(0, 1)
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self.connect_nodes(1, 2)
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self.sync_blocks(self.nodes[0:3], timeout=120)
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self.log.info("Verify height on node 2: %d" % self.nodes[2].getblockcount())
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self.log.info("Usage possibly still high because of stale blocks in block files: %d" % calc_usage(self.prunedir))
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self.log.info("Mine 220 more large blocks so we have requisite history")
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mine_large_blocks(self.nodes[0], 220)
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self.sync_blocks(self.nodes[0:3], timeout=120)
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usage = calc_usage(self.prunedir)
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self.log.info("Usage should be below target: %d" % usage)
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assert_greater_than(550, usage)
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def reorg_back(self):
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# Verify that a block on the old main chain fork has been pruned away
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assert_raises_rpc_error(-1, "Block not available (pruned data)", self.nodes[2].getblock, self.forkhash)
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with self.nodes[2].assert_debug_log(expected_msgs=['block verification stopping at height', '(pruning, no data)']):
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self.nodes[2].verifychain(checklevel=4, nblocks=0)
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self.log.info("Will need to redownload block %d" % self.forkheight)
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# Verify that we have enough history to reorg back to the fork point
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# Although this is more than 288 blocks, because this chain was written more recently
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# and only its other 299 small and 220 large blocks are in the block files after it,
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# it is expected to still be retained
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self.nodes[2].getblock(self.nodes[2].getblockhash(self.forkheight))
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first_reorg_height = self.nodes[2].getblockcount()
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curchainhash = self.nodes[2].getblockhash(self.mainchainheight)
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self.nodes[2].invalidateblock(curchainhash)
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goalbestheight = self.mainchainheight
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goalbesthash = self.mainchainhash2
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# As of 0.10 the current block download logic is not able to reorg to the original chain created in
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# create_chain_with_stale_blocks because it doesn't know of any peer that's on that chain from which to
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# redownload its missing blocks.
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# Invalidate the reorg_test chain in node 0 as well, it can successfully switch to the original chain
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# because it has all the block data.
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# However it must mine enough blocks to have a more work chain than the reorg_test chain in order
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# to trigger node 2's block download logic.
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# At this point node 2 is within 288 blocks of the fork point so it will preserve its ability to reorg
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if self.nodes[2].getblockcount() < self.mainchainheight:
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blocks_to_mine = first_reorg_height + 1 - self.mainchainheight
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self.log.info("Rewind node 0 to prev main chain to mine longer chain to trigger redownload. Blocks needed: %d" % blocks_to_mine)
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self.nodes[0].invalidateblock(curchainhash)
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assert_equal(self.nodes[0].getblockcount(), self.mainchainheight)
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assert_equal(self.nodes[0].getbestblockhash(), self.mainchainhash2)
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goalbesthash = self.nodes[0].generate(blocks_to_mine)[-1]
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goalbestheight = first_reorg_height + 1
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self.log.info("Verify node 2 reorged back to the main chain, some blocks of which it had to redownload")
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# Wait for Node 2 to reorg to proper height
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self.wait_until(lambda: self.nodes[2].getblockcount() >= goalbestheight, timeout=900)
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assert_equal(self.nodes[2].getbestblockhash(), goalbesthash)
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# Verify we can now have the data for a block previously pruned
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assert_equal(self.nodes[2].getblock(self.forkhash)["height"], self.forkheight)
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def manual_test(self, node_number, use_timestamp):
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# at this point, node has 995 blocks and has not yet run in prune mode
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self.start_node(node_number)
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node = self.nodes[node_number]
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assert_equal(node.getblockcount(), 995)
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assert_raises_rpc_error(-1, "not in prune mode", node.pruneblockchain, 500)
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# now re-start in manual pruning mode
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self.restart_node(node_number, extra_args=["-prune=1"])
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node = self.nodes[node_number]
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assert_equal(node.getblockcount(), 995)
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def height(index):
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if use_timestamp:
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return node.getblockheader(node.getblockhash(index))["time"] + TIMESTAMP_WINDOW
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else:
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return index
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def prune(index):
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ret = node.pruneblockchain(height=height(index))
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assert_equal(ret, node.getblockchaininfo()['pruneheight'])
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def has_block(index):
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return os.path.isfile(os.path.join(self.nodes[node_number].datadir, self.chain, "blocks", "blk{:05}.dat".format(index)))
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# should not prune because chain tip of node 3 (995) < PruneAfterHeight (1000)
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assert_raises_rpc_error(-1, "Blockchain is too short for pruning", node.pruneblockchain, height(500))
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# Save block transaction count before pruning, assert value
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block1_details = node.getblock(node.getblockhash(1))
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assert_equal(block1_details["nTx"], len(block1_details["tx"]))
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# mine 6 blocks so we are at height 1001 (i.e., above PruneAfterHeight)
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node.generate(6)
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assert_equal(node.getblockchaininfo()["blocks"], 1001)
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# Pruned block should still know the number of transactions
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assert_equal(node.getblockheader(node.getblockhash(1))["nTx"], block1_details["nTx"])
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# negative heights should raise an exception
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assert_raises_rpc_error(-8, "Negative", node.pruneblockchain, -10)
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# height=100 too low to prune first block file so this is a no-op
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prune(100)
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assert has_block(0), "blk00000.dat is missing when should still be there"
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# Does nothing
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node.pruneblockchain(height(0))
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assert has_block(0), "blk00000.dat is missing when should still be there"
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# height=500 should prune first file
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prune(500)
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assert not has_block(0), "blk00000.dat is still there, should be pruned by now"
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assert has_block(1), "blk00001.dat is missing when should still be there"
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# height=650 should prune second file
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prune(650)
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assert not has_block(1), "blk00001.dat is still there, should be pruned by now"
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# height=1000 should not prune anything more, because tip-288 is in blk00002.dat.
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prune(1000)
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assert has_block(2), "blk00002.dat is still there, should be pruned by now"
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# advance the tip so blk00002.dat and blk00003.dat can be pruned (the last 288 blocks should now be in blk00004.dat)
|
||
|
|
node.generate(288)
|
||
|
|
prune(1000)
|
||
|
|
assert not has_block(2), "blk00002.dat is still there, should be pruned by now"
|
||
|
|
assert not has_block(3), "blk00003.dat is still there, should be pruned by now"
|
||
|
|
|
||
|
|
# stop node, start back up with auto-prune at 550 MiB, make sure still runs
|
||
|
|
self.restart_node(node_number, extra_args=["-prune=550"])
|
||
|
|
|
||
|
|
self.log.info("Success")
|
||
|
|
|
||
|
|
def wallet_test(self):
|
||
|
|
# check that the pruning node's wallet is still in good shape
|
||
|
|
self.log.info("Stop and start pruning node to trigger wallet rescan")
|
||
|
|
self.restart_node(2, extra_args=["-prune=550"])
|
||
|
|
self.log.info("Success")
|
||
|
|
|
||
|
|
# check that wallet loads successfully when restarting a pruned node after IBD.
|
||
|
|
# this was reported to fail in #7494.
|
||
|
|
self.log.info("Syncing node 5 to test wallet")
|
||
|
|
self.connect_nodes(0, 5)
|
||
|
|
nds = [self.nodes[0], self.nodes[5]]
|
||
|
|
self.sync_blocks(nds, wait=5, timeout=300)
|
||
|
|
self.restart_node(5, extra_args=["-prune=550"]) # restart to trigger rescan
|
||
|
|
self.log.info("Success")
|
||
|
|
|
||
|
|
def run_test(self):
|
||
|
|
self.log.info("Warning! This test requires 4GB of disk space")
|
||
|
|
|
||
|
|
self.log.info("Mining a big blockchain of 995 blocks")
|
||
|
|
self.create_big_chain()
|
||
|
|
# Chain diagram key:
|
||
|
|
# * blocks on main chain
|
||
|
|
# +,&,$,@ blocks on other forks
|
||
|
|
# X invalidated block
|
||
|
|
# N1 Node 1
|
||
|
|
#
|
||
|
|
# Start by mining a simple chain that all nodes have
|
||
|
|
# N0=N1=N2 **...*(995)
|
||
|
|
|
||
|
|
# stop manual-pruning node with 995 blocks
|
||
|
|
self.stop_node(3)
|
||
|
|
self.stop_node(4)
|
||
|
|
|
||
|
|
self.log.info("Check that we haven't started pruning yet because we're below PruneAfterHeight")
|
||
|
|
self.test_height_min()
|
||
|
|
# Extend this chain past the PruneAfterHeight
|
||
|
|
# N0=N1=N2 **...*(1020)
|
||
|
|
|
||
|
|
self.log.info("Check that we'll exceed disk space target if we have a very high stale block rate")
|
||
|
|
self.create_chain_with_staleblocks()
|
||
|
|
# Disconnect N0
|
||
|
|
# And mine a 24 block chain on N1 and a separate 25 block chain on N0
|
||
|
|
# N1=N2 **...*+...+(1044)
|
||
|
|
# N0 **...**...**(1045)
|
||
|
|
#
|
||
|
|
# reconnect nodes causing reorg on N1 and N2
|
||
|
|
# N1=N2 **...*(1020) *...**(1045)
|
||
|
|
# \
|
||
|
|
# +...+(1044)
|
||
|
|
#
|
||
|
|
# repeat this process until you have 12 stale forks hanging off the
|
||
|
|
# main chain on N1 and N2
|
||
|
|
# N0 *************************...***************************(1320)
|
||
|
|
#
|
||
|
|
# N1=N2 **...*(1020) *...**(1045) *.. ..**(1295) *...**(1320)
|
||
|
|
# \ \ \
|
||
|
|
# +...+(1044) &.. $...$(1319)
|
||
|
|
|
||
|
|
# Save some current chain state for later use
|
||
|
|
self.mainchainheight = self.nodes[2].getblockcount() # 1320
|
||
|
|
self.mainchainhash2 = self.nodes[2].getblockhash(self.mainchainheight)
|
||
|
|
|
||
|
|
self.log.info("Check that we can survive a 288 block reorg still")
|
||
|
|
self.reorg_test() # (1033, )
|
||
|
|
# Now create a 288 block reorg by mining a longer chain on N1
|
||
|
|
# First disconnect N1
|
||
|
|
# Then invalidate 1033 on main chain and 1032 on fork so height is 1032 on main chain
|
||
|
|
# N1 **...*(1020) **...**(1032)X..
|
||
|
|
# \
|
||
|
|
# ++...+(1031)X..
|
||
|
|
#
|
||
|
|
# Now mine 300 more blocks on N1
|
||
|
|
# N1 **...*(1020) **...**(1032) @@...@(1332)
|
||
|
|
# \ \
|
||
|
|
# \ X...
|
||
|
|
# \ \
|
||
|
|
# ++...+(1031)X.. ..
|
||
|
|
#
|
||
|
|
# Reconnect nodes and mine 220 more blocks on N1
|
||
|
|
# N1 **...*(1020) **...**(1032) @@...@@@(1552)
|
||
|
|
# \ \
|
||
|
|
# \ X...
|
||
|
|
# \ \
|
||
|
|
# ++...+(1031)X.. ..
|
||
|
|
#
|
||
|
|
# N2 **...*(1020) **...**(1032) @@...@@@(1552)
|
||
|
|
# \ \
|
||
|
|
# \ *...**(1320)
|
||
|
|
# \ \
|
||
|
|
# ++...++(1044) ..
|
||
|
|
#
|
||
|
|
# N0 ********************(1032) @@...@@@(1552)
|
||
|
|
# \
|
||
|
|
# *...**(1320)
|
||
|
|
|
||
|
|
self.log.info("Test that we can rerequest a block we previously pruned if needed for a reorg")
|
||
|
|
self.reorg_back()
|
||
|
|
# Verify that N2 still has block 1033 on current chain (@), but not on main chain (*)
|
||
|
|
# Invalidate 1033 on current chain (@) on N2 and we should be able to reorg to
|
||
|
|
# original main chain (*), but will require redownload of some blocks
|
||
|
|
# In order to have a peer we think we can download from, must also perform this invalidation
|
||
|
|
# on N0 and mine a new longest chain to trigger.
|
||
|
|
# Final result:
|
||
|
|
# N0 ********************(1032) **...****(1553)
|
||
|
|
# \
|
||
|
|
# X@...@@@(1552)
|
||
|
|
#
|
||
|
|
# N2 **...*(1020) **...**(1032) **...****(1553)
|
||
|
|
# \ \
|
||
|
|
# \ X@...@@@(1552)
|
||
|
|
# \
|
||
|
|
# +..
|
||
|
|
#
|
||
|
|
# N1 doesn't change because 1033 on main chain (*) is invalid
|
||
|
|
|
||
|
|
self.log.info("Test manual pruning with block indices")
|
||
|
|
self.manual_test(3, use_timestamp=False)
|
||
|
|
|
||
|
|
self.log.info("Test manual pruning with timestamps")
|
||
|
|
self.manual_test(4, use_timestamp=True)
|
||
|
|
|
||
|
|
self.log.info("Test wallet re-scan")
|
||
|
|
self.wallet_test()
|
||
|
|
|
||
|
|
self.log.info("Done")
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
PruneTest().main()
|