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9d33b30a87
dac7a111bdd3b0233d94cf68dae7a8bfc6ac9c64 refactor: test: use _ variable for unused loop counters (Sebastian Falbesoner)
Pull request description:
This tiny PR substitutes Python loops in the form of `for x in range(N): ...` by `for _ in range(N): ...` where applicable. The idea is indicating to the reader that a block (or statement, in list comprehensions) is just repeated N times, and that the loop counter is not used in the body, hence using the throwaway variable. This is already done quite often in the current tests (see e.g. `$ git grep "for _ in range("`). Another alternative would be using `itertools.repeat` (according to Python core developer Raymond Hettinger it's [even faster](https://twitter.com/raymondh/status/1144527183341375488)), but that doesn't seem to be widespread in use and I'm not sure about a readability increase.
The only drawback I see is that whenever one wants to debug loop iterations, one would need to introduce a loop variable again. Reviewing this is basically a no-brainer, since tests would fail immediately if a a substitution has taken place on a loop where the variable is used.
Instances to replace were found by `$ git grep "for.*in range("` and manually checked.
ACKs for top commit:
darosior:
ACK dac7a111bdd3b0233d94cf68dae7a8bfc6ac9c64
instagibbs:
manual inspection ACK dac7a111bd
practicalswift:
ACK dac7a111bdd3b0233d94cf68dae7a8bfc6ac9c64 -- the updated code is easier to reason about since the throwaway nature of a variable is expressed explicitly (using the Pythonic `_` idiom) instead of implicitly. Explicit is better than implicit was we all know by now :)
Tree-SHA512: 5f43ded9ce14e5e00b3876ec445b90acda1842f813149ae7bafa93f3ac3d510bb778e2c701187fd2c73585e6b87797bb2d2987139bd1a9ba7d58775a59392406
180 lines
8.3 KiB
Python
Executable File
180 lines
8.3 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2014-2020 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, dashd 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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from test_framework.test_framework import BitcoinTestFramework
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# from test_framework.mininode import P2PTxInvStore
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from test_framework.util import (
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assert_equal,
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assert_greater_than_or_equal, assert_raises_rpc_error,
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)
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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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self.log.debug("Send 5 transactions from node2 (to its own address)")
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tx_creation_time_lower = self.mocktime
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for _ in range(5):
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last_txid = 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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tx_creation_time_higher = self.mocktime
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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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total_fee_old = self.nodes[0].getmempoolinfo()['total_fee']
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self.log.debug("Prioritize a transaction on node0")
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fees = self.nodes[0].getmempoolentry(txid=last_txid)['fees']
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assert_equal(fees['base'], fees['modified'])
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self.nodes[0].prioritisetransaction(txid=last_txid, fee_delta=1000)
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fees = self.nodes[0].getmempoolentry(txid=last_txid)['fees']
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assert_equal(fees['base'] + Decimal('0.00001000'), fees['modified'])
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self.log.info('Check the total base fee is unchanged after prioritisetransaction')
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assert_equal(total_fee_old, self.nodes[0].getmempoolinfo()['total_fee'])
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assert_equal(total_fee_old, sum(v['fees']['base'] for k, v in self.nodes[0].getrawmempool(verbose=True).items()))
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tx_creation_time = self.nodes[0].getmempoolentry(txid=last_txid)['time']
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assert_greater_than_or_equal(tx_creation_time, tx_creation_time_lower)
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assert_greater_than_or_equal(tx_creation_time_higher, tx_creation_time)
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# disconnect nodes & make a txn that remains in the unbroadcast set.
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self.disconnect_nodes(0, 1)
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assert(len(self.nodes[0].getpeerinfo()) == 0)
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assert(len(self.nodes[0].p2ps) == 0)
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self.nodes[0].sendtoaddress(self.nodes[2].getnewaddress(), Decimal("12"))
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self.connect_nodes(0, 2)
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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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assert self.nodes[0].getmempoolinfo()["loaded"] # start_node is blocking on the mempool being loaded
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assert self.nodes[2].getmempoolinfo()["loaded"]
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assert_equal(len(self.nodes[0].getrawmempool()), 6)
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assert_equal(len(self.nodes[2].getrawmempool()), 5)
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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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self.log.debug('Verify prioritization is loaded correctly')
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fees = self.nodes[0].getmempoolentry(txid=last_txid)['fees']
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assert_equal(fees['base'] + Decimal('0.00001000'), fees['modified'])
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self.log.debug('Verify time is loaded correctly')
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assert_equal(tx_creation_time, self.nodes[0].getmempoolentry(txid=last_txid)['time'])
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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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# start node0 with wallet disabled so wallet transactions don't get resubmitted
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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", "-disablewallet"])
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assert self.nodes[0].getmempoolinfo()["loaded"]
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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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assert self.nodes[0].getmempoolinfo()["loaded"]
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assert_equal(len(self.nodes[0].getrawmempool()), 6)
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mempooldat0 = os.path.join(self.nodes[0].datadir, self.chain, 'mempool.dat')
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mempooldat1 = os.path.join(self.nodes[1].datadir, self.chain, '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 6 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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assert self.nodes[1].getmempoolinfo()["loaded"]
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assert_equal(len(self.nodes[1].getrawmempool()), 6)
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self.log.debug("Prevent dashd 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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self.test_persist_unbroadcast()
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def test_persist_unbroadcast(self):
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node0 = self.nodes[0]
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self.start_node(0)
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# clear out mempool
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node0.generate(1)
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# ensure node0 doesn't have any connections
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# make a transaction that will remain in the unbroadcast set
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assert(len(node0.getpeerinfo()) == 0)
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assert(len(node0.p2ps) == 0)
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node0.sendtoaddress(self.nodes[1].getnewaddress(), Decimal("12"))
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# shutdown, then startup with wallet disabled
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self.stop_nodes()
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self.start_node(0, extra_args=["-disablewallet"])
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# check that txn gets broadcast due to unbroadcast logic
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# conn = node0.add_p2p_connection(P2PTxInvStore())
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# node0.mockscheduler(16*60) # 15 min + 1 for buffer
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# wait_until(lambda: len(conn.get_invs()) == 1)
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if __name__ == '__main__':
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MempoolPersistTest().main()
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