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https://github.com/Retropex/bitcoin.git
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1abbdac677
When a wallet uses avoid_reuse and has a large number of outputs in a single destination, it groups these outputs in OutputGroups that are no larger than OUTPUT_GROUP_MAX_ENTRIES. The goal is to spend as many outputs as possible from the destination while not breaking consensus due to a huge number of inputs and also not surprise the use with high fees. If there are n outputs in a destination and n > OUTPUT_GROUP_MAX_ENTRIES then this results in one or many groups of size OUTPUT_GROUP_MAX_ENTRIES and possibly one group of size < OUTPUT_GROUP_MAX_ENTRIES. Prior to this commit the coin selection in the case where n > OUTPUT_GROUP_MAX_ENTRIES was skewed towards the one group of size < OUTPUT_GROUP_MAX_ENTRIES if it exists and the amount to be spent by the transaction is smaller than the aggregate of those of the group size < OUTPUT_GROUP_MAX_ENTRIES. The reason is that the coin selection decides between the different groups based on fees and mostly the smaller group will cause smaller fees. The behavior that users of the avoid_reuse flag seek is that the full groups of size OUTPUT_GROUP_MAX_ENTRIES get used first. This commit implements this by pretending that the small group has a large number of ancestors (one smallet than the maximum allowed for this wallet). This dumps the small group to the bottom of the list of priorities in the coin selection algorithm.
383 lines
16 KiB
Python
Executable File
383 lines
16 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2018-2020 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 the avoid_reuse and setwalletflag features."""
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import (
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assert_approx,
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assert_equal,
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assert_raises_rpc_error,
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connect_nodes,
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)
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def reset_balance(node, discardaddr):
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'''Throw away all owned coins by the node so it gets a balance of 0.'''
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balance = node.getbalance(avoid_reuse=False)
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if balance > 0.5:
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node.sendtoaddress(address=discardaddr, amount=balance, subtractfeefromamount=True, avoid_reuse=False)
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def count_unspent(node):
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'''Count the unspent outputs for the given node and return various statistics'''
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r = {
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"total": {
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"count": 0,
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"sum": 0,
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},
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"reused": {
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"count": 0,
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"sum": 0,
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},
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}
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supports_reused = True
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for utxo in node.listunspent(minconf=0):
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r["total"]["count"] += 1
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r["total"]["sum"] += utxo["amount"]
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if supports_reused and "reused" in utxo:
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if utxo["reused"]:
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r["reused"]["count"] += 1
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r["reused"]["sum"] += utxo["amount"]
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else:
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supports_reused = False
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r["reused"]["supported"] = supports_reused
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return r
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def assert_unspent(node, total_count=None, total_sum=None, reused_supported=None, reused_count=None, reused_sum=None):
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'''Make assertions about a node's unspent output statistics'''
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stats = count_unspent(node)
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if total_count is not None:
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assert_equal(stats["total"]["count"], total_count)
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if total_sum is not None:
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assert_approx(stats["total"]["sum"], total_sum, 0.001)
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if reused_supported is not None:
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assert_equal(stats["reused"]["supported"], reused_supported)
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if reused_count is not None:
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assert_equal(stats["reused"]["count"], reused_count)
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if reused_sum is not None:
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assert_approx(stats["reused"]["sum"], reused_sum, 0.001)
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def assert_balances(node, mine):
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'''Make assertions about a node's getbalances output'''
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got = node.getbalances()["mine"]
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for k,v in mine.items():
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assert_approx(got[k], v, 0.001)
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class AvoidReuseTest(BitcoinTestFramework):
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def set_test_params(self):
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self.setup_clean_chain = False
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self.num_nodes = 2
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# This test isn't testing txn relay/timing, so set whitelist on the
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# peers for instant txn relay. This speeds up the test run time 2-3x.
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self.extra_args = [["-whitelist=noban@127.0.0.1"]] * self.num_nodes
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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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'''Set up initial chain and run tests defined below'''
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self.test_persistence()
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self.test_immutable()
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self.nodes[0].generate(110)
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self.sync_all()
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self.test_change_remains_change(self.nodes[1])
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reset_balance(self.nodes[1], self.nodes[0].getnewaddress())
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self.test_fund_send_fund_senddirty()
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reset_balance(self.nodes[1], self.nodes[0].getnewaddress())
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self.test_fund_send_fund_send("legacy")
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reset_balance(self.nodes[1], self.nodes[0].getnewaddress())
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self.test_fund_send_fund_send("p2sh-segwit")
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reset_balance(self.nodes[1], self.nodes[0].getnewaddress())
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self.test_fund_send_fund_send("bech32")
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reset_balance(self.nodes[1], self.nodes[0].getnewaddress())
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self.test_getbalances_used()
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reset_balance(self.nodes[1], self.nodes[0].getnewaddress())
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self.test_full_destination_group_is_preferred()
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reset_balance(self.nodes[1], self.nodes[0].getnewaddress())
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self.test_all_destination_groups_are_used()
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def test_persistence(self):
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'''Test that wallet files persist the avoid_reuse flag.'''
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self.log.info("Test wallet files persist avoid_reuse flag")
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# Configure node 1 to use avoid_reuse
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self.nodes[1].setwalletflag('avoid_reuse')
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# Flags should be node1.avoid_reuse=false, node2.avoid_reuse=true
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assert_equal(self.nodes[0].getwalletinfo()["avoid_reuse"], False)
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assert_equal(self.nodes[1].getwalletinfo()["avoid_reuse"], True)
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# Stop and restart node 1
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self.stop_node(1)
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self.start_node(1)
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connect_nodes(self.nodes[0], 1)
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# Flags should still be node1.avoid_reuse=false, node2.avoid_reuse=true
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assert_equal(self.nodes[0].getwalletinfo()["avoid_reuse"], False)
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assert_equal(self.nodes[1].getwalletinfo()["avoid_reuse"], True)
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# Attempting to set flag to its current state should throw
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assert_raises_rpc_error(-8, "Wallet flag is already set to false", self.nodes[0].setwalletflag, 'avoid_reuse', False)
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assert_raises_rpc_error(-8, "Wallet flag is already set to true", self.nodes[1].setwalletflag, 'avoid_reuse', True)
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def test_immutable(self):
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'''Test immutable wallet flags'''
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self.log.info("Test immutable wallet flags")
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# Attempt to set the disable_private_keys flag; this should not work
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assert_raises_rpc_error(-8, "Wallet flag is immutable", self.nodes[1].setwalletflag, 'disable_private_keys')
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tempwallet = ".wallet_avoidreuse.py_test_immutable_wallet.dat"
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# Create a wallet with disable_private_keys set; this should work
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self.nodes[1].createwallet(tempwallet, True)
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w = self.nodes[1].get_wallet_rpc(tempwallet)
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# Attempt to unset the disable_private_keys flag; this should not work
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assert_raises_rpc_error(-8, "Wallet flag is immutable", w.setwalletflag, 'disable_private_keys', False)
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# Unload temp wallet
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self.nodes[1].unloadwallet(tempwallet)
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def test_change_remains_change(self, node):
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self.log.info("Test that change doesn't turn into non-change when spent")
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reset_balance(node, node.getnewaddress())
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addr = node.getnewaddress()
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txid = node.sendtoaddress(addr, 1)
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out = node.listunspent(minconf=0, query_options={'minimumAmount': 2})
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assert_equal(len(out), 1)
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assert_equal(out[0]['txid'], txid)
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changeaddr = out[0]['address']
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# Make sure it's starting out as change as expected
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assert node.getaddressinfo(changeaddr)['ischange']
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for logical_tx in node.listtransactions():
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assert logical_tx.get('address') != changeaddr
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# Spend it
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reset_balance(node, node.getnewaddress())
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# It should still be change
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assert node.getaddressinfo(changeaddr)['ischange']
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for logical_tx in node.listtransactions():
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assert logical_tx.get('address') != changeaddr
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def test_fund_send_fund_senddirty(self):
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'''
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Test the same as test_fund_send_fund_send, except send the 10 BTC with
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the avoid_reuse flag set to false. This means the 10 BTC send should succeed,
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where it fails in test_fund_send_fund_send.
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'''
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self.log.info("Test fund send fund send dirty")
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fundaddr = self.nodes[1].getnewaddress()
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retaddr = self.nodes[0].getnewaddress()
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self.nodes[0].sendtoaddress(fundaddr, 10)
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self.nodes[0].generate(1)
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self.sync_all()
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# listunspent should show 1 single, unused 10 btc output
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assert_unspent(self.nodes[1], total_count=1, total_sum=10, reused_supported=True, reused_count=0)
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# getbalances should show no used, 10 btc trusted
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assert_balances(self.nodes[1], mine={"used": 0, "trusted": 10})
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# node 0 should not show a used entry, as it does not enable avoid_reuse
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assert("used" not in self.nodes[0].getbalances()["mine"])
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self.nodes[1].sendtoaddress(retaddr, 5)
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self.nodes[0].generate(1)
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self.sync_all()
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# listunspent should show 1 single, unused 5 btc output
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assert_unspent(self.nodes[1], total_count=1, total_sum=5, reused_supported=True, reused_count=0)
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# getbalances should show no used, 5 btc trusted
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assert_balances(self.nodes[1], mine={"used": 0, "trusted": 5})
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self.nodes[0].sendtoaddress(fundaddr, 10)
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self.nodes[0].generate(1)
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self.sync_all()
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# listunspent should show 2 total outputs (5, 10 btc), one unused (5), one reused (10)
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assert_unspent(self.nodes[1], total_count=2, total_sum=15, reused_count=1, reused_sum=10)
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# getbalances should show 10 used, 5 btc trusted
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assert_balances(self.nodes[1], mine={"used": 10, "trusted": 5})
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self.nodes[1].sendtoaddress(address=retaddr, amount=10, avoid_reuse=False)
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# listunspent should show 1 total outputs (5 btc), unused
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assert_unspent(self.nodes[1], total_count=1, total_sum=5, reused_count=0)
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# getbalances should show no used, 5 btc trusted
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assert_balances(self.nodes[1], mine={"used": 0, "trusted": 5})
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# node 1 should now have about 5 btc left (for both cases)
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assert_approx(self.nodes[1].getbalance(), 5, 0.001)
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assert_approx(self.nodes[1].getbalance(avoid_reuse=False), 5, 0.001)
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def test_fund_send_fund_send(self, second_addr_type):
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'''
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Test the simple case where [1] generates a new address A, then
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[0] sends 10 BTC to A.
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[1] spends 5 BTC from A. (leaving roughly 5 BTC useable)
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[0] sends 10 BTC to A again.
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[1] tries to spend 10 BTC (fails; dirty).
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[1] tries to spend 4 BTC (succeeds; change address sufficient)
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'''
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self.log.info("Test fund send fund send")
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fundaddr = self.nodes[1].getnewaddress(label="", address_type="legacy")
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retaddr = self.nodes[0].getnewaddress()
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self.nodes[0].sendtoaddress(fundaddr, 10)
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self.nodes[0].generate(1)
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self.sync_all()
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# listunspent should show 1 single, unused 10 btc output
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assert_unspent(self.nodes[1], total_count=1, total_sum=10, reused_supported=True, reused_count=0)
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# getbalances should show no used, 10 btc trusted
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assert_balances(self.nodes[1], mine={"used": 0, "trusted": 10})
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self.nodes[1].sendtoaddress(retaddr, 5)
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self.nodes[0].generate(1)
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self.sync_all()
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# listunspent should show 1 single, unused 5 btc output
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assert_unspent(self.nodes[1], total_count=1, total_sum=5, reused_supported=True, reused_count=0)
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# getbalances should show no used, 5 btc trusted
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assert_balances(self.nodes[1], mine={"used": 0, "trusted": 5})
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# For the second send, we transmute it to a related single-key address
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# to make sure it's also detected as re-use
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fund_spk = self.nodes[0].getaddressinfo(fundaddr)["scriptPubKey"]
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fund_decoded = self.nodes[0].decodescript(fund_spk)
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if second_addr_type == "p2sh-segwit":
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new_fundaddr = fund_decoded["segwit"]["p2sh-segwit"]
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elif second_addr_type == "bech32":
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new_fundaddr = fund_decoded["segwit"]["addresses"][0]
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else:
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new_fundaddr = fundaddr
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assert_equal(second_addr_type, "legacy")
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self.nodes[0].sendtoaddress(new_fundaddr, 10)
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self.nodes[0].generate(1)
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self.sync_all()
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# listunspent should show 2 total outputs (5, 10 btc), one unused (5), one reused (10)
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assert_unspent(self.nodes[1], total_count=2, total_sum=15, reused_count=1, reused_sum=10)
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# getbalances should show 10 used, 5 btc trusted
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assert_balances(self.nodes[1], mine={"used": 10, "trusted": 5})
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# node 1 should now have a balance of 5 (no dirty) or 15 (including dirty)
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assert_approx(self.nodes[1].getbalance(), 5, 0.001)
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assert_approx(self.nodes[1].getbalance(avoid_reuse=False), 15, 0.001)
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assert_raises_rpc_error(-6, "Insufficient funds", self.nodes[1].sendtoaddress, retaddr, 10)
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self.nodes[1].sendtoaddress(retaddr, 4)
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# listunspent should show 2 total outputs (1, 10 btc), one unused (1), one reused (10)
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assert_unspent(self.nodes[1], total_count=2, total_sum=11, reused_count=1, reused_sum=10)
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# getbalances should show 10 used, 1 btc trusted
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assert_balances(self.nodes[1], mine={"used": 10, "trusted": 1})
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# node 1 should now have about 1 btc left (no dirty) and 11 (including dirty)
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assert_approx(self.nodes[1].getbalance(), 1, 0.001)
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assert_approx(self.nodes[1].getbalance(avoid_reuse=False), 11, 0.001)
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def test_getbalances_used(self):
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'''
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getbalances and listunspent should pick up on reused addresses
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immediately, even for address reusing outputs created before the first
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transaction was spending from that address
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'''
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self.log.info("Test getbalances used category")
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# node under test should be completely empty
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assert_equal(self.nodes[1].getbalance(avoid_reuse=False), 0)
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new_addr = self.nodes[1].getnewaddress()
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ret_addr = self.nodes[0].getnewaddress()
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# send multiple transactions, reusing one address
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for _ in range(11):
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self.nodes[0].sendtoaddress(new_addr, 1)
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self.nodes[0].generate(1)
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self.sync_all()
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# send transaction that should not use all the available outputs
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# per the current coin selection algorithm
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self.nodes[1].sendtoaddress(ret_addr, 5)
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# getbalances and listunspent should show the remaining outputs
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# in the reused address as used/reused
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assert_unspent(self.nodes[1], total_count=2, total_sum=6, reused_count=1, reused_sum=1)
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assert_balances(self.nodes[1], mine={"used": 1, "trusted": 5})
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def test_full_destination_group_is_preferred(self):
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'''
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Test the case where [1] only has 11 outputs of 1 BTC in the same reused
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address and tries to send a small payment of 0.5 BTC. The wallet
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should use 10 outputs from the reused address as inputs and not a
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single 1 BTC input, in order to join several outputs from the reused
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address.
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'''
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self.log.info("Test that full destination groups are preferred in coin selection")
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# Node under test should be empty
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assert_equal(self.nodes[1].getbalance(avoid_reuse=False), 0)
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new_addr = self.nodes[1].getnewaddress()
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ret_addr = self.nodes[0].getnewaddress()
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# Send 11 outputs of 1 BTC to the same, reused address in the wallet
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for _ in range(11):
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self.nodes[0].sendtoaddress(new_addr, 1)
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self.nodes[0].generate(1)
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self.sync_all()
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# Sending a transaction that is smaller than each one of the
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# available outputs
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txid = self.nodes[1].sendtoaddress(address=ret_addr, amount=0.5)
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inputs = self.nodes[1].getrawtransaction(txid, 1)["vin"]
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# The transaction should use 10 inputs exactly
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assert_equal(len(inputs), 10)
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def test_all_destination_groups_are_used(self):
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'''
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Test the case where [1] only has 22 outputs of 1 BTC in the same reused
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address and tries to send a payment of 20.5 BTC. The wallet
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should use all 22 outputs from the reused address as inputs.
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'''
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self.log.info("Test that all destination groups are used")
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# Node under test should be empty
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assert_equal(self.nodes[1].getbalance(avoid_reuse=False), 0)
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new_addr = self.nodes[1].getnewaddress()
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ret_addr = self.nodes[0].getnewaddress()
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# Send 22 outputs of 1 BTC to the same, reused address in the wallet
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for _ in range(22):
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self.nodes[0].sendtoaddress(new_addr, 1)
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self.nodes[0].generate(1)
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self.sync_all()
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# Sending a transaction that needs to use the full groups
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# of 10 inputs but also the incomplete group of 2 inputs.
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txid = self.nodes[1].sendtoaddress(address=ret_addr, amount=20.5)
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inputs = self.nodes[1].getrawtransaction(txid, 1)["vin"]
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# The transaction should use 22 inputs exactly
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assert_equal(len(inputs), 22)
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if __name__ == '__main__':
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AvoidReuseTest().main()
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