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dash/test/functional/feature_pruning.py
MarcoFalke fce74ffd0c
Merge #15686: [tests] make pruning test faster 
03d6d23810 [tests] make pruning test faster (John Newbery)
1c29ac40fb [tests] style fixes in feature_pruning.py (John Newbery)

Pull request description:

  This commit makes the pruning.py much faster.

  Key insights to do this:

  - pruning.py doesn't care what kind of transactions make up the big
  blocks that are pruned in the test. Instead of making blocks with
  several large, expensive to construct and validate transactions,
  instead make the large blocks contain a single coinbase transaction with
  a huge OP_RETURN txout.
  - avoid stop-starting nodes where possible.

ACKs for commit 03d6d2:
  MarcoFalke:
    utACK 03d6d238104d228acfae9f3e122879bddef8d27d

Tree-SHA512: 511642ce0fa294319dce3486fe06d75970d8ab66deda7f692be081d3056b4ce5b4cf91a7b5762eefbba224ba6c848750016454ff1e5d564acc507b1c41213628
2021-10-20 05:05:09 +05:30

471 lines
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#!/usr/bin/env python3
# Copyright (c) 2014-2016 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 the pruning code.
WARNING:
This test uses 4GB of disk space.
This test takes 30 mins or more (up to 2 hours)
"""
import os
from test_framework.blocktools import create_coinbase
from test_framework.messages import CBlock, ToHex
from test_framework.script import CScript, OP_RETURN, OP_NOP
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import assert_equal, assert_greater_than, assert_raises_rpc_error, connect_nodes, disconnect_nodes, wait_until
MIN_BLOCKS_TO_KEEP = 288
# Rescans start at the earliest block up to 2 hours before a key timestamp, so
# the manual prune RPC avoids pruning blocks in the same window to be
# compatible with pruning based on key creation time.
TIMESTAMP_WINDOW = 2 * 60 * 60
def mine_large_blocks(node, n):
# Make a large scriptPubKey for the coinbase transaction. This is OP_RETURN
# followed by 950k of OP_NOP. This would be non-standard in a non-coinbase
# transaction but is consensus valid.
# Get the block parameters for the first block
big_script = CScript([OP_RETURN] + [OP_NOP] * 950000)
best_block = node.getblock(node.getbestblockhash())
height = int(best_block["height"]) + 1
try:
# Static variable ensures that time is monotonicly increasing and is therefore
# different for each block created => blockhash is unique.
mine_large_blocks.nTime = min(mine_large_blocks.nTime, int(best_block["time"])) + 1
except AttributeError:
mine_large_blocks.nTime = int(best_block["time"]) + 1
previousblockhash = int(best_block["hash"], 16)
for _ in range(n):
# Build the coinbase transaction (with large scriptPubKey)
coinbase_tx = create_coinbase(height)
coinbase_tx.vin[0].nSequence = 2 ** 32 - 1
coinbase_tx.vout[0].scriptPubKey = big_script
coinbase_tx.rehash()
# Build the block
block = CBlock()
block.nVersion = best_block["version"]
block.hashPrevBlock = previousblockhash
block.nTime = mine_large_blocks.nTime
block.nBits = int('207fffff', 16)
block.nNonce = 0
block.vtx = [coinbase_tx]
block.hashMerkleRoot = block.calc_merkle_root()
block.solve()
# Submit to the node
node.submitblock(ToHex(block))
previousblockhash = block.sha256
height += 1
mine_large_blocks.nTime += 1
def calc_usage(blockdir):
return sum(os.path.getsize(blockdir + f) for f in os.listdir(blockdir) if os.path.isfile(os.path.join(blockdir, f))) / (1024. * 1024.)
class PruneTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 6
# Create nodes 0 and 1 to mine.
# Create node 2 to test pruning.
self.full_node_default_args = ["-dip3params=2000:2000", "-dip8params=2000", "-maxreceivebuffer=20000", "-blockmaxsize=999000", "-checkblocks=5"]
# Create nodes 3 and 4 to test manual pruning (they will be re-started with manual pruning later)
# Create nodes 5 to test wallet in prune mode, but do not connect
self.extra_args = [
self.full_node_default_args,
self.full_node_default_args,
["-dip3params=2000:2000", "-dip8params=2000", "-disablegovernance","-txindex=0","-maxreceivebuffer=20000","-prune=550"],
["-dip3params=2000:2000", "-dip8params=2000", "-disablegovernance","-txindex=0","-maxreceivebuffer=20000","-blockmaxsize=999000"],
["-dip3params=2000:2000", "-dip8params=2000", "-disablegovernance","-txindex=0","-maxreceivebuffer=20000","-blockmaxsize=999000"],
["-dip3params=2000:2000", "-dip8params=2000", "-disablegovernance","-txindex=0","-prune=550"],
]
def skip_test_if_missing_module(self):
self.skip_if_no_wallet()
def setup_network(self):
self.setup_nodes()
self.prunedir = os.path.join(self.nodes[2].datadir, self.chain, 'blocks', '')
connect_nodes(self.nodes[0], 1)
connect_nodes(self.nodes[1], 2)
connect_nodes(self.nodes[0], 2)
connect_nodes(self.nodes[0], 3)
connect_nodes(self.nodes[0], 4)
self.sync_blocks(self.nodes[0:5])
def setup_nodes(self):
self.add_nodes(self.num_nodes, self.extra_args)
self.start_nodes()
def create_big_chain(self):
# Start by creating some coinbases we can spend later
self.nodes[1].generate(200)
self.sync_blocks(self.nodes[0:2])
self.nodes[0].generate(150)
# Then mine enough full blocks to create more than 550MiB of data
mine_large_blocks(self.nodes[0], 645)
self.sync_blocks(self.nodes[0:5])
def test_height_min(self):
assert os.path.isfile(os.path.join(self.prunedir, "blk00000.dat")), "blk00000.dat is missing, pruning too early"
self.log.info("Success")
self.log.info("Though we're already using more than 550MiB, current usage: %d" % calc_usage(self.prunedir))
self.log.info("Mining 25 more blocks should cause the first block file to be pruned")
# Pruning doesn't run until we're allocating another chunk, 20 full blocks past the height cutoff will ensure this
mine_large_blocks(self.nodes[0], 25)
# Wait for blk00000.dat to be pruned
wait_until(lambda: not os.path.isfile(os.path.join(self.prunedir, "blk00000.dat")), timeout=30)
self.log.info("Success")
usage = calc_usage(self.prunedir)
self.log.info("Usage should be below target: %d" % usage)
assert_greater_than(550, usage)
def create_chain_with_staleblocks(self):
# Create stale blocks in manageable sized chunks
self.log.info("Mine 24 (stale) blocks on Node 1, followed by 25 (main chain) block reorg from Node 0, for 12 rounds")
for j in range(12):
# Disconnect node 0 so it can mine a longer reorg chain without knowing about node 1's soon-to-be-stale chain
# Node 2 stays connected, so it hears about the stale blocks and then reorg's when node0 reconnects
disconnect_nodes(self.nodes[0], 1)
disconnect_nodes(self.nodes[0], 2)
# Mine 24 blocks in node 1
mine_large_blocks(self.nodes[1], 24)
# Reorg back with 25 block chain from node 0
mine_large_blocks(self.nodes[0], 25)
# Create connections in the order so both nodes can see the reorg at the same time
connect_nodes(self.nodes[0], 1)
connect_nodes(self.nodes[0], 2)
self.sync_blocks(self.nodes[0:3])
self.log.info("Usage can be over target because of high stale rate: %d" % calc_usage(self.prunedir))
def reorg_test(self):
# Node 1 will mine a 300 block chain starting 287 blocks back from Node 0 and Node 2's tip
# This will cause Node 2 to do a reorg requiring 288 blocks of undo data to the reorg_test chain
height = self.nodes[1].getblockcount()
self.log.info("Current block height: %d" % height)
self.forkheight = height - 287
self.forkhash = self.nodes[1].getblockhash(self.forkheight)
self.log.info("Invalidating block %s at height %d" % (self.forkhash, self.forkheight))
self.nodes[1].invalidateblock(self.forkhash)
# We've now switched to our previously mined-24 block fork on node 1, but that's not what we want
# So invalidate that fork as well, until we're on the same chain as node 0/2 (but at an ancestor 288 blocks ago)
mainchainhash = self.nodes[0].getblockhash(self.forkheight - 1)
curhash = self.nodes[1].getblockhash(self.forkheight - 1)
while curhash != mainchainhash:
self.nodes[1].invalidateblock(curhash)
curhash = self.nodes[1].getblockhash(self.forkheight - 1)
assert self.nodes[1].getblockcount() == self.forkheight - 1
self.log.info("New best height: %d" % self.nodes[1].getblockcount())
# Mine one block to avoid automatic recovery from forks on restart
self.nodes[1].generate(1)
# Disconnect node1 and generate the new chain
disconnect_nodes(self.nodes[0], 1)
disconnect_nodes(self.nodes[1], 2)
self.log.info("Generating new longer chain of 300 more blocks")
self.nodes[1].generate(299)
self.log.info("Reconnect nodes")
connect_nodes(self.nodes[0], 1)
connect_nodes(self.nodes[1], 2)
self.sync_blocks(self.nodes[0:3], timeout=120)
self.log.info("Verify height on node 2: %d" % self.nodes[2].getblockcount())
self.log.info("Usage possibly still high because of stale blocks in block files: %d" % calc_usage(self.prunedir))
self.log.info("Mine 220 more large blocks so we have requisite history")
mine_large_blocks(self.nodes[0], 220)
usage = calc_usage(self.prunedir)
self.log.info("Usage should be below target: %d" % usage)
assert_greater_than(550, usage)
def reorg_back(self):
# Verify that a block on the old main chain fork has been pruned away
assert_raises_rpc_error(-1, "Block not available (pruned data)", self.nodes[2].getblock, self.forkhash)
with self.nodes[2].assert_debug_log(expected_msgs=['block verification stopping at height', '(pruning, no data)']):
self.nodes[2].verifychain(checklevel=4, nblocks=0)
self.log.info("Will need to redownload block %d" % self.forkheight)
# Verify that we have enough history to reorg back to the fork point
# Although this is more than 288 blocks, because this chain was written more recently
# and only its other 299 small and 220 large blocks are in the block files after it,
# it is expected to still be retained
self.nodes[2].getblock(self.nodes[2].getblockhash(self.forkheight))
first_reorg_height = self.nodes[2].getblockcount()
curchainhash = self.nodes[2].getblockhash(self.mainchainheight)
self.nodes[2].invalidateblock(curchainhash)
goalbestheight = self.mainchainheight
goalbesthash = self.mainchainhash2
# As of 0.10 the current block download logic is not able to reorg to the original chain created in
# create_chain_with_stale_blocks because it doesn't know of any peer that's on that chain from which to
# redownload its missing blocks.
# Invalidate the reorg_test chain in node 0 as well, it can successfully switch to the original chain
# because it has all the block data.
# However it must mine enough blocks to have a more work chain than the reorg_test chain in order
# to trigger node 2's block download logic.
# At this point node 2 is within 288 blocks of the fork point so it will preserve its ability to reorg
if self.nodes[2].getblockcount() < self.mainchainheight:
blocks_to_mine = first_reorg_height + 1 - self.mainchainheight
self.log.info("Rewind node 0 to prev main chain to mine longer chain to trigger redownload. Blocks needed: %d" % blocks_to_mine)
self.nodes[0].invalidateblock(curchainhash)
assert_equal(self.nodes[0].getblockcount(), self.mainchainheight)
assert_equal(self.nodes[0].getbestblockhash(), self.mainchainhash2)
goalbesthash = self.nodes[0].generate(blocks_to_mine)[-1]
goalbestheight = first_reorg_height + 1
self.log.info("Verify node 2 reorged back to the main chain, some blocks of which it had to redownload")
# Wait for Node 2 to reorg to proper height
wait_until(lambda: self.nodes[2].getblockcount() >= goalbestheight, timeout=900)
assert_equal(self.nodes[2].getbestblockhash(), goalbesthash)
# Verify we can now have the data for a block previously pruned
assert_equal(self.nodes[2].getblock(self.forkhash)["height"], self.forkheight)
def manual_test(self, node_number, use_timestamp):
# at this point, node has 995 blocks and has not yet run in prune mode
self.start_node(node_number, extra_args=["-dip3params=2000:2000", "-dip8params=2000", "-disablegovernance", "-txindex=0"])
node = self.nodes[node_number]
assert_equal(node.getblockcount(), 995)
assert_raises_rpc_error(-1, "not in prune mode", node.pruneblockchain, 500)
# now re-start in manual pruning mode
self.stop_node(node_number, expected_stderr='Warning: You are starting with governance validation disabled.')
self.start_node(node_number, extra_args=["-dip3params=2000:2000", "-dip8params=2000", "-disablegovernance", "-txindex=0", "-prune=1"])
node = self.nodes[node_number]
assert_equal(node.getblockcount(), 995)
def height(index):
if use_timestamp:
return node.getblockheader(node.getblockhash(index))["time"] + TIMESTAMP_WINDOW
else:
return index
def prune(index, expected_ret=None):
ret = node.pruneblockchain(height=height(index))
# Check the return value. When use_timestamp is True, just check
# that the return value is less than or equal to the expected
# value, because when more than one block is generated per second,
# a timestamp will not be granular enough to uniquely identify an
# individual block.
if expected_ret is None:
expected_ret = index
if use_timestamp:
assert_greater_than(ret, 0)
assert_greater_than(expected_ret + 1, ret)
else:
assert_equal(ret, expected_ret)
def has_block(index):
return os.path.isfile(os.path.join(self.nodes[node_number].datadir, self.chain, "blocks", "blk{:05}.dat".format(index)))
# should not prune because chain tip of node 3 (995) < PruneAfterHeight (1000)
assert_raises_rpc_error(-1, "Blockchain is too short for pruning", node.pruneblockchain, height(500))
# Save block transaction count before pruning, assert value
block1_details = node.getblock(node.getblockhash(1))
assert_equal(block1_details["nTx"], len(block1_details["tx"]))
# mine 6 blocks so we are at height 1001 (i.e., above PruneAfterHeight)
node.generate(6)
assert_equal(node.getblockchaininfo()["blocks"], 1001)
# Pruned block should still know the number of transactions
assert_equal(node.getblockheader(node.getblockhash(1))["nTx"], block1_details["nTx"])
# negative heights should raise an exception
assert_raises_rpc_error(-8, "Negative", node.pruneblockchain, -10)
# height=100 too low to prune first block file so this is a no-op
prune(100)
assert has_block(0), "blk00000.dat is missing when should still be there"
# Does nothing
node.pruneblockchain(height(0))
assert has_block(0), "blk00000.dat is missing when should still be there"
# height=500 should prune first file
prune(500)
assert not has_block(0), "blk00000.dat is still there, should be pruned by now"
assert has_block(1), "blk00001.dat is missing when should still be there"
# height=650 should prune second file
prune(650)
assert not has_block(1), "blk00001.dat is still there, should be pruned by now"
# height=1000 should not prune anything more, because tip-288 is in blk00002.dat.
prune(1000, 1001 - MIN_BLOCKS_TO_KEEP)
assert has_block(2), "blk00002.dat is still there, should be pruned by now"
# 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.stop_node(node_number, expected_stderr='Warning: You are starting with governance validation disabled. This is expected because you are running a pruned node.')
self.start_node(node_number, extra_args=["-dip3params=2000:2000", "-dip8params=2000", "-disablegovernance", "-txindex=0", "-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.stop_node(2, expected_stderr='Warning: You are starting with governance validation disabled. This is expected because you are running a pruned node.')
self.start_node(2, extra_args=["-dip3params=2000:2000", "-dip8params=2000", "-disablegovernance", "-txindex=0", "-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")
connect_nodes(self.nodes[0], 5)
nds = [self.nodes[0], self.nodes[5]]
self.sync_blocks(nds, wait=5, timeout=300)
self.stop_node(5, expected_stderr='Warning: You are starting with governance validation disabled. This is expected because you are running a pruned node.') # stop and start to trigger rescan
self.start_node(5, extra_args=["-dip3params=2000:2000", "-dip8params=2000", "-disablegovernance", "-txindex=0", "-prune=550"])
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, expected_stderr='Warning: You are starting with governance validation disabled.')
self.stop_node(4, expected_stderr='Warning: You are starting with governance validation disabled.')
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("Stopping pruned nodes manually")
for i in range(2, 6):
self.log.info("Stopping pruned node%d" % i)
self.stop_node(i, expected_stderr='Warning: You are starting with governance validation disabled. This is expected because you are running a pruned node.')
self.log.info("Done")
if __name__ == '__main__':
PruneTest().main()
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