124 lines
5.6 KiB
Python
Executable File
124 lines
5.6 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2014-2018 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 mempool persistence.
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By default, bitcoind will dump mempool on shutdown and
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then reload it on startup. This can be overridden with
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the -persistmempool=0 command line option.
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Test is as follows:
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- start node0, node1 and node2. node1 has -persistmempool=0
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- create 5 transactions on node2 to its own address. Note that these
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are not sent to node0 or node1 addresses because we don't want
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them to be saved in the wallet.
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- check that node0 and node1 have 5 transactions in their mempools
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- shutdown all nodes.
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- startup node0. Verify that it still has 5 transactions
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in its mempool. Shutdown node0. This tests that by default the
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mempool is persistent.
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- startup node1. Verify that its mempool is empty. Shutdown node1.
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This tests that with -persistmempool=0, the mempool is not
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dumped to disk when the node is shut down.
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- Restart node0 with -persistmempool=0. Verify that its mempool is
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empty. Shutdown node0. This tests that with -persistmempool=0,
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the mempool is not loaded from disk on start up.
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- Restart node0 with -persistmempool. Verify that it has 5
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transactions in its mempool. This tests that -persistmempool=0
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does not overwrite a previously valid mempool stored on disk.
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- Remove node0 mempool.dat and verify savemempool RPC recreates it
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and verify that node1 can load it and has 5 transactions in its
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mempool.
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- Verify that savemempool throws when the RPC is called if
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node1 can't write to disk.
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"""
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from decimal import Decimal
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import os
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import time
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import assert_equal, assert_raises_rpc_error, wait_until
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class MempoolPersistTest(BitcoinTestFramework):
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def set_test_params(self):
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self.num_nodes = 3
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self.extra_args = [[], ["-persistmempool=0"], []]
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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 run_test(self):
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chain_height = self.nodes[0].getblockcount()
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assert_equal(chain_height, 200)
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self.log.debug("Mine a single block to get out of IBD")
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self.nodes[0].generate(1)
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self.sync_all()
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self.log.debug("Send 5 transactions from node2 (to its own address)")
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for i in range(5):
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self.nodes[2].sendtoaddress(self.nodes[2].getnewaddress(), Decimal("10"))
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node2_balance = self.nodes[2].getbalance()
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self.sync_all()
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self.log.debug("Verify that node0 and node1 have 5 transactions in their mempools")
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assert_equal(len(self.nodes[0].getrawmempool()), 5)
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assert_equal(len(self.nodes[1].getrawmempool()), 5)
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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.")
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self.stop_nodes()
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# Give this node a head-start, so we can be "extra-sure" that it didn't load anything later
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# Also don't store the mempool, to keep the datadir clean
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self.start_node(1, extra_args=["-persistmempool=0"])
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self.start_node(0)
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self.start_node(2)
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# Give bitcoind a second to reload the mempool
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wait_until(lambda: len(self.nodes[0].getrawmempool()) == 5, timeout=1)
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wait_until(lambda: len(self.nodes[2].getrawmempool()) == 5, timeout=1)
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# The others have loaded their mempool. If node_1 loaded anything, we'd probably notice by now:
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assert_equal(len(self.nodes[1].getrawmempool()), 0)
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# Verify accounting of mempool transactions after restart is correct
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self.nodes[2].syncwithvalidationinterfacequeue() # Flush mempool to wallet
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assert_equal(node2_balance, self.nodes[2].getbalance())
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self.log.debug("Stop-start node0 with -persistmempool=0. Verify that it doesn't load its mempool.dat file.")
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self.stop_nodes()
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self.start_node(0, extra_args=["-persistmempool=0"])
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# Give bitcoind a second to reload the mempool
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time.sleep(1)
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assert_equal(len(self.nodes[0].getrawmempool()), 0)
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self.log.debug("Stop-start node0. Verify that it has the transactions in its mempool.")
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self.stop_nodes()
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self.start_node(0)
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wait_until(lambda: len(self.nodes[0].getrawmempool()) == 5)
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mempooldat0 = os.path.join(self.nodes[0].datadir, 'regtest', 'mempool.dat')
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mempooldat1 = os.path.join(self.nodes[1].datadir, 'regtest', 'mempool.dat')
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self.log.debug("Remove the mempool.dat file. Verify that savemempool to disk via RPC re-creates it")
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os.remove(mempooldat0)
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self.nodes[0].savemempool()
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assert os.path.isfile(mempooldat0)
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self.log.debug("Stop nodes, make node1 use mempool.dat from node0. Verify it has 5 transactions")
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os.rename(mempooldat0, mempooldat1)
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self.stop_nodes()
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self.start_node(1, extra_args=[])
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wait_until(lambda: len(self.nodes[1].getrawmempool()) == 5)
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self.log.debug("Prevent bitcoind from writing mempool.dat to disk. Verify that `savemempool` fails")
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# to test the exception we are creating a tmp folder called mempool.dat.new
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# which is an implementation detail that could change and break this test
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mempooldotnew1 = mempooldat1 + '.new'
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os.mkdir(mempooldotnew1)
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assert_raises_rpc_error(-1, "Unable to dump mempool to disk", self.nodes[1].savemempool)
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os.rmdir(mempooldotnew1)
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if __name__ == '__main__':
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MempoolPersistTest().main()
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