r1

test/functional/mempool_persist.py

@@ -0,0 +1,117 @@
+#!/usr/bin/env python3
+# Copyright (c) 2014-2017 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 transaction in its
+    mempool.
+  - Verify that savemempool throws when the RPC is called if
+    node1 can't write to disk.
+
+"""
+import os
+import time
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import *
+
+class MempoolPersistTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 3
+        self.extra_args = [[], ["-persistmempool=0"], []]
+
+    def run_test(self):
+        chain_height = self.nodes[0].getblockcount()
+        assert_equal(chain_height, 200)
+
+        self.log.debug("Mine a single block to get out of IBD")
+        self.nodes[0].generate(1)
+        self.sync_all()
+
+        self.log.debug("Send 5 transactions from node2 (to its own address)")
+        for i in range(5):
+            self.nodes[2].sendtoaddress(self.nodes[2].getnewaddress(), Decimal("10"))
+        node2_balance = self.nodes[2].getbalance()
+        self.sync_all()
+
+        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("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()
+        self.start_node(1)  # Give this one a head-start, so we can be "extra-sure" that it didn't load anything later
+        self.start_node(0)
+        self.start_node(2)
+        # Give bitcoind a second to reload the mempool
+        wait_until(lambda: len(self.nodes[0].getrawmempool()) == 5, timeout=1)
+        wait_until(lambda: len(self.nodes[2].getrawmempool()) == 5, timeout=1)
+        # 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)
+
+        # 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())
+
+        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"])
+        # Give bitcoind a second to reload the mempool
+        time.sleep(1)
+        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)
+        wait_until(lambda: len(self.nodes[0].getrawmempool()) == 5)
+
+        mempooldat0 = os.path.join(self.options.tmpdir, 'node0', 'regtest', 'mempool.dat')
+        mempooldat1 = os.path.join(self.options.tmpdir, 'node1', 'regtest', '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 5 transactions")
+        os.rename(mempooldat0, mempooldat1)
+        self.stop_nodes()
+        self.start_node(1, extra_args=[])
+        wait_until(lambda: len(self.nodes[1].getrawmempool()) == 5)
+
+        self.log.debug("Prevent bitcoind from writing mempool.dat to disk. Verify that `savemempool` fails")
+        # to test the exception we are setting bad permissions on a tmp file called mempool.dat.new
+        # which is an implementation detail that could change and break this test
+        mempooldotnew1 = mempooldat1 + '.new'
+        with os.fdopen(os.open(mempooldotnew1, os.O_CREAT, 0o000), 'w'):
+            pass
+        assert_raises_rpc_error(-1, "Unable to dump mempool to disk", self.nodes[1].savemempool)
+        os.remove(mempooldotnew1)
+
+if __name__ == '__main__':
+    MempoolPersistTest().main()