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#!/usr/bin/env python3
# Copyright (c) 2014-2021 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 mempool persistence.
By default, bitcoind will dump mempool on shutdown and
then reload it on startup. This can be overridden with
the -persistmempool=0 command line option.
Test is as follows:
- start node0, node1 and node2. node1 has -persistmempool=0
- create 5 transactions on node2 to its own address. Note that these
are not sent to node0 or node1 addresses because we don't want
them to be saved in the wallet.
- check that node0 and node1 have 5 transactions in their mempools
- shutdown all nodes.
- startup node0. Verify that it still has 5 transactions
in its mempool. Shutdown node0. This tests that by default the
mempool is persistent.
- startup node1. Verify that its mempool is empty. Shutdown node1.
This tests that with -persistmempool=0, the mempool is not
dumped to disk when the node is shut down.
- Restart node0 with -persistmempool=0. Verify that its mempool is
empty. Shutdown node0. This tests that with -persistmempool=0,
the mempool is not loaded from disk on start up.
- Restart node0 with -persistmempool. Verify that it has 5
transactions in its mempool. This tests that -persistmempool=0
does not overwrite a previously valid mempool stored on disk.
- Remove node0 mempool.dat and verify savemempool RPC recreates it
and verify that node1 can load it and has 5 transactions in its
mempool.
- Verify that savemempool throws when the RPC is called if
node1 can't write to disk.
"""
from decimal import Decimal
import os
import time
from test_framework.p2p import P2PTxInvStore
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
assert_greater_than_or_equal,
assert_raises_rpc_error,
)
from test_framework.wallet import MiniWallet
class MempoolPersistTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 3
self.extra_args = [[], ["-persistmempool=0"], []]
def run_test(self):
self.mini_wallet = MiniWallet(self.nodes[2])
self.mini_wallet.rescan_utxos()
if self.is_sqlite_compiled():
self.nodes[2].createwallet(
wallet_name="watch",
descriptors=True,
disable_private_keys=True,
load_on_startup=False,
)
wallet_watch = self.nodes[2].get_wallet_rpc("watch")
assert_equal([{'success': True}], wallet_watch.importdescriptors([{'desc': self.mini_wallet.get_descriptor(), 'timestamp': 0}]))
self.log.debug("Send 5 transactions from node2 (to its own address)")
tx_creation_time_lower = int(time.time())
for _ in range(5):
last_txid = self.mini_wallet.send_self_transfer(from_node=self.nodes[2])["txid"]
if self.is_sqlite_compiled():
self.nodes[2].syncwithvalidationinterfacequeue() # Flush mempool to wallet
node2_balance = wallet_watch.getbalance()
self.sync_all()
tx_creation_time_higher = int(time.time())
self.log.debug("Verify that node0 and node1 have 5 transactions in their mempools")
assert_equal(len(self.nodes[0].getrawmempool()), 5)
assert_equal(len(self.nodes[1].getrawmempool()), 5)
total_fee_old = self.nodes[0].getmempoolinfo()['total_fee']
self.log.debug("Prioritize a transaction on node0")
fees = self.nodes[0].getmempoolentry(txid=last_txid)['fees']
assert_equal(fees['base'], fees['modified'])
self.nodes[0].prioritisetransaction(txid=last_txid, fee_delta=1000)
fees = self.nodes[0].getmempoolentry(txid=last_txid)['fees']
assert_equal(fees['base'] + Decimal('0.00001000'), fees['modified'])
self.log.info('Check the total base fee is unchanged after prioritisetransaction')
assert_equal(total_fee_old, self.nodes[0].getmempoolinfo()['total_fee'])
assert_equal(total_fee_old, sum(v['fees']['base'] for k, v in self.nodes[0].getrawmempool(verbose=True).items()))
last_entry = self.nodes[0].getmempoolentry(txid=last_txid)
tx_creation_time = last_entry['time']
assert_greater_than_or_equal(tx_creation_time, tx_creation_time_lower)
assert_greater_than_or_equal(tx_creation_time_higher, tx_creation_time)
# disconnect nodes & make a txn that remains in the unbroadcast set.
self.disconnect_nodes(0, 1)
assert_equal(len(self.nodes[0].getpeerinfo()), 0)
assert_equal(len(self.nodes[0].p2ps), 0)
self.mini_wallet.send_self_transfer(from_node=self.nodes[0])
# Test persistence of prioritisation for transactions not in the mempool.
# Create a tx and prioritise but don't submit until after the restart.
tx_prioritised_not_submitted = self.mini_wallet.create_self_transfer()
self.nodes[0].prioritisetransaction(txid=tx_prioritised_not_submitted['txid'], fee_delta=9999)
self.log.debug("Stop-start the nodes. Verify that node0 has the transactions in its mempool and node1 does not. Verify that node2 calculates its balance correctly after loading wallet transactions.")
self.stop_nodes()
# Give this node a head-start, so we can be "extra-sure" that it didn't load anything later
# Also don't store the mempool, to keep the datadir clean
self.start_node(1, extra_args=["-persistmempool=0"])
self.start_node(0)
self.start_node(2)
assert self.nodes[0].getmempoolinfo()["loaded"] # start_node is blocking on the mempool being loaded
assert self.nodes[2].getmempoolinfo()["loaded"]
assert_equal(len(self.nodes[0].getrawmempool()), 6)
assert_equal(len(self.nodes[2].getrawmempool()), 5)
# The others have loaded their mempool. If node_1 loaded anything, we'd probably notice by now:
assert_equal(len(self.nodes[1].getrawmempool()), 0)
self.log.debug('Verify prioritization is loaded correctly')
fees = self.nodes[0].getmempoolentry(txid=last_txid)['fees']
assert_equal(fees['base'] + Decimal('0.00001000'), fees['modified'])
self.log.debug('Verify all fields are loaded correctly')
assert_equal(last_entry, self.nodes[0].getmempoolentry(txid=last_txid))
self.nodes[0].sendrawtransaction(tx_prioritised_not_submitted['hex'])
entry_prioritised_before_restart = self.nodes[0].getmempoolentry(txid=tx_prioritised_not_submitted['txid'])
assert_equal(entry_prioritised_before_restart['fees']['base'] + Decimal('0.00009999'), entry_prioritised_before_restart['fees']['modified'])
# Verify accounting of mempool transactions after restart is correct
if self.is_sqlite_compiled():
self.nodes[2].loadwallet("watch")
wallet_watch = self.nodes[2].get_wallet_rpc("watch")
self.nodes[2].syncwithvalidationinterfacequeue() # Flush mempool to wallet
assert_equal(node2_balance, wallet_watch.getbalance())
self.log.debug("Stop-start node0 with -persistmempool=0. Verify that it doesn't load its mempool.dat file.")
self.stop_nodes()
self.start_node(0, extra_args=["-persistmempool=0"])
assert self.nodes[0].getmempoolinfo()["loaded"]
assert_equal(len(self.nodes[0].getrawmempool()), 0)
self.log.debug("Stop-start node0. Verify that it has the transactions in its mempool.")
self.stop_nodes()
self.start_node(0)
assert self.nodes[0].getmempoolinfo()["loaded"]
assert_equal(len(self.nodes[0].getrawmempool()), 7)
mempooldat0 = os.path.join(self.nodes[0].datadir, self.chain, 'mempool.dat')
mempooldat1 = os.path.join(self.nodes[1].datadir, self.chain, 'mempool.dat')
self.log.debug("Remove the mempool.dat file. Verify that savemempool to disk via RPC re-creates it")
os.remove(mempooldat0)
result0 = self.nodes[0].savemempool()
assert os.path.isfile(mempooldat0)
assert_equal(result0['filename'], mempooldat0)
self.log.debug("Stop nodes, make node1 use mempool.dat from node0. Verify it has 7 transactions")
os.rename(mempooldat0, mempooldat1)
self.stop_nodes()
self.start_node(1, extra_args=["-persistmempool"])
assert self.nodes[1].getmempoolinfo()["loaded"]
assert_equal(len(self.nodes[1].getrawmempool()), 7)
self.log.debug("Prevent bitcoind from writing mempool.dat to disk. Verify that `savemempool` fails")
# to test the exception we are creating a tmp folder called mempool.dat.new
# which is an implementation detail that could change and break this test
mempooldotnew1 = mempooldat1 + '.new'
os.mkdir(mempooldotnew1)
assert_raises_rpc_error(-1, "Unable to dump mempool to disk", self.nodes[1].savemempool)
os.rmdir(mempooldotnew1)
self.test_persist_unbroadcast()
def test_persist_unbroadcast(self):
node0 = self.nodes[0]
self.start_node(0)
# clear out mempool
self.generate(node0, 1, sync_fun=self.no_op)
# ensure node0 doesn't have any connections
# make a transaction that will remain in the unbroadcast set
assert_equal(len(node0.getpeerinfo()), 0)
assert_equal(len(node0.p2ps), 0)
self.mini_wallet.send_self_transfer(from_node=node0)
# shutdown, then startup with wallet disabled
self.restart_node(0, extra_args=["-disablewallet"])
# check that txn gets broadcast due to unbroadcast logic
conn = node0.add_p2p_connection(P2PTxInvStore())
node0.mockscheduler(16 * 60) # 15 min + 1 for buffer
self.wait_until(lambda: len(conn.get_invs()) == 1)
if __name__ == "__main__":
MempoolPersistTest().main()
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