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mempool_persist.py
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#!/usr/bin/env python3
# Copyright (c) 2014-2020 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.test_framework import BitcoinTestFramework
from test_framework.mininode import P2PTxInvStore
from test_framework.util import (
assert_equal,
assert_greater_than_or_equal,
assert_raises_rpc_error,
connect_nodes,
disconnect_nodes,
wait_until,
)
class MempoolPersistTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 3
self.extra_args = [[], ["-persistmempool=0"], []]
def skip_test_if_missing_module(self):
self.skip_if_no_wallet()
def run_test(self):
self.log.debug("Send 5 transactions from node2 (to its own address)")
tx_creation_time_lower = int(time.time())
for i in range(5):
last_txid = self.nodes[2].sendtoaddress(self.nodes[2].getnewaddress(), Decimal("10"))
node2_balance = self.nodes[2].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)
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'])
tx_creation_time = self.nodes[0].getmempoolentry(txid=last_txid)['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.
disconnect_nodes(self.nodes[0], 1)
assert(len(self.nodes[0].getpeerinfo()) == 0)
assert(len(self.nodes[0].p2ps) == 0)
self.nodes[0].sendtoaddress(self.nodes[2].getnewaddress(), Decimal("12"))
connect_nodes(self.nodes[0], 2)
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 time is loaded correctly')
assert_equal(tx_creation_time, self.nodes[0].getmempoolentry(txid=last_txid)['time'])
# Verify accounting of mempool transactions after restart is correct
self.nodes[2].syncwithvalidationinterfacequeue() # Flush mempool to wallet
assert_equal(node2_balance, self.nodes[2].getbalance())
# start node0 with wallet disabled so wallet transactions don't get resubmitted
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", "-disablewallet"])
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()), 6)
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)
self.nodes[0].savemempool()
assert os.path.isfile(mempooldat0)
self.log.debug("Stop nodes, make node1 use mempool.dat from node0. Verify it has 6 transactions")
os.rename(mempooldat0, mempooldat1)
self.stop_nodes()
self.start_node(1, extra_args=[])
assert self.nodes[1].getmempoolinfo()["loaded"]
assert_equal(len(self.nodes[1].getrawmempool()), 6)
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
node0.generate(1)
# ensure node0 doesn't have any connections
# make a transaction that will remain in the unbroadcast set
assert(len(node0.getpeerinfo()) == 0)
assert(len(node0.p2ps) == 0)
node0.sendtoaddress(self.nodes[1].getnewaddress(), Decimal("12"))
# shutdown, then startup with wallet disabled
self.stop_nodes()
self.start_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
wait_until(lambda: len(conn.get_invs()) == 1)
if __name__ == '__main__':
MempoolPersistTest().main()