diff options
| -rw-r--r-- | src/rpc/client.cpp | 2 | ||||
| -rw-r--r-- | src/wallet/rpc/wallet.cpp | 112 | ||||
| -rwxr-xr-x | test/functional/test_runner.py | 2 | ||||
| -rwxr-xr-x | test/functional/wallet_simulaterawtx.py | 129 |
4 files changed, 245 insertions, 0 deletions
diff --git a/src/rpc/client.cpp b/src/rpc/client.cpp index 9be3ab7df0..ee287656b6 100644 --- a/src/rpc/client.cpp +++ b/src/rpc/client.cpp @@ -147,6 +147,8 @@ static const CRPCConvertParam vRPCConvertParams[] = { "sendall", 1, "conf_target" }, { "sendall", 3, "fee_rate"}, { "sendall", 4, "options" }, + { "simulaterawtransaction", 0, "rawtxs" }, + { "simulaterawtransaction", 1, "options" }, { "importprivkey", 2, "rescan" }, { "importaddress", 2, "rescan" }, { "importaddress", 3, "p2sh" }, diff --git a/src/wallet/rpc/wallet.cpp b/src/wallet/rpc/wallet.cpp index 0fe8871152..eb275f9951 100644 --- a/src/wallet/rpc/wallet.cpp +++ b/src/wallet/rpc/wallet.cpp @@ -590,6 +590,117 @@ static RPCHelpMan upgradewallet() }; } +RPCHelpMan simulaterawtransaction() +{ + return RPCHelpMan{"simulaterawtransaction", + "\nCalculate the balance change resulting in the signing and broadcasting of the given transaction(s).\n", + { + {"rawtxs", RPCArg::Type::ARR, RPCArg::Optional::OMITTED_NAMED_ARG, "An array of hex strings of raw transactions.\n", + { + {"rawtx", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, ""}, + }, + }, + {"options", RPCArg::Type::OBJ_USER_KEYS, RPCArg::Optional::OMITTED_NAMED_ARG, "Options", + { + {"include_watchonly", RPCArg::Type::BOOL, RPCArg::DefaultHint{"true for watch-only wallets, otherwise false"}, "Whether to include watch-only addresses (see RPC importaddress)"}, + }, + }, + }, + RPCResult{ + RPCResult::Type::OBJ, "", "", + { + {RPCResult::Type::STR_AMOUNT, "balance_change", "The wallet balance change (negative means decrease)."}, + } + }, + RPCExamples{ + HelpExampleCli("simulaterawtransaction", "[\"myhex\"]") + + HelpExampleRpc("simulaterawtransaction", "[\"myhex\"]") + }, + [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue +{ + const std::shared_ptr<const CWallet> rpc_wallet = GetWalletForJSONRPCRequest(request); + if (!rpc_wallet) return UniValue::VNULL; + const CWallet& wallet = *rpc_wallet; + + RPCTypeCheck(request.params, {UniValue::VARR, UniValue::VOBJ}, true); + + LOCK(wallet.cs_wallet); + + UniValue include_watchonly(UniValue::VNULL); + if (request.params[1].isObject()) { + UniValue options = request.params[1]; + RPCTypeCheckObj(options, + { + {"include_watchonly", UniValueType(UniValue::VBOOL)}, + }, + true, true); + + include_watchonly = options["include_watchonly"]; + } + + isminefilter filter = ISMINE_SPENDABLE; + if (ParseIncludeWatchonly(include_watchonly, wallet)) { + filter |= ISMINE_WATCH_ONLY; + } + + const auto& txs = request.params[0].get_array(); + CAmount changes{0}; + std::map<COutPoint, CAmount> new_utxos; // UTXO:s that were made available in transaction array + std::set<COutPoint> spent; + + for (size_t i = 0; i < txs.size(); ++i) { + CMutableTransaction mtx; + if (!DecodeHexTx(mtx, txs[i].get_str(), /* try_no_witness */ true, /* try_witness */ true)) { + throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Transaction hex string decoding failure."); + } + + // Fetch previous transactions (inputs) + std::map<COutPoint, Coin> coins; + for (const CTxIn& txin : mtx.vin) { + coins[txin.prevout]; // Create empty map entry keyed by prevout. + } + wallet.chain().findCoins(coins); + + // Fetch debit; we are *spending* these; if the transaction is signed and + // broadcast, we will lose everything in these + for (const auto& txin : mtx.vin) { + const auto& outpoint = txin.prevout; + if (spent.count(outpoint)) { + throw JSONRPCError(RPC_INVALID_PARAMETER, "Transaction(s) are spending the same output more than once"); + } + if (new_utxos.count(outpoint)) { + changes -= new_utxos.at(outpoint); + new_utxos.erase(outpoint); + } else { + if (coins.at(outpoint).IsSpent()) { + throw JSONRPCError(RPC_INVALID_PARAMETER, "One or more transaction inputs are missing or have been spent already"); + } + changes -= wallet.GetDebit(txin, filter); + } + spent.insert(outpoint); + } + + // Iterate over outputs; we are *receiving* these, if the wallet considers + // them "mine"; if the transaction is signed and broadcast, we will receive + // everything in these + // Also populate new_utxos in case these are spent in later transactions + + const auto& hash = mtx.GetHash(); + for (size_t i = 0; i < mtx.vout.size(); ++i) { + const auto& txout = mtx.vout[i]; + bool is_mine = 0 < (wallet.IsMine(txout) & filter); + changes += new_utxos[COutPoint(hash, i)] = is_mine ? txout.nValue : 0; + } + } + + UniValue result(UniValue::VOBJ); + result.pushKV("balance_change", ValueFromAmount(changes)); + + return result; +} + }; +} + // addresses RPCHelpMan getaddressinfo(); RPCHelpMan getnewaddress(); @@ -721,6 +832,7 @@ Span<const CRPCCommand> GetWalletRPCCommands() {"wallet", &setwalletflag}, {"wallet", &signmessage}, {"wallet", &signrawtransactionwithwallet}, + {"wallet", &simulaterawtransaction}, {"wallet", &sendall}, {"wallet", &unloadwallet}, {"wallet", &upgradewallet}, diff --git a/test/functional/test_runner.py b/test/functional/test_runner.py index e5784eb614..2b365d8d10 100755 --- a/test/functional/test_runner.py +++ b/test/functional/test_runner.py @@ -265,6 +265,8 @@ BASE_SCRIPTS = [ 'wallet_implicitsegwit.py --legacy-wallet', 'rpc_named_arguments.py', 'feature_startupnotify.py', + 'wallet_simulaterawtx.py --legacy-wallet', + 'wallet_simulaterawtx.py --descriptors', 'wallet_listsinceblock.py --legacy-wallet', 'wallet_listsinceblock.py --descriptors', 'wallet_listdescriptors.py --descriptors', diff --git a/test/functional/wallet_simulaterawtx.py b/test/functional/wallet_simulaterawtx.py new file mode 100755 index 0000000000..a408b99515 --- /dev/null +++ b/test/functional/wallet_simulaterawtx.py @@ -0,0 +1,129 @@ +#!/usr/bin/env python3 +# Copyright (c) 2021 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 simulaterawtransaction. +""" + +from decimal import Decimal +from test_framework.blocktools import COINBASE_MATURITY +from test_framework.test_framework import BitcoinTestFramework +from test_framework.util import ( + assert_approx, + assert_equal, + assert_raises_rpc_error, +) + +class SimulateTxTest(BitcoinTestFramework): + def set_test_params(self): + self.setup_clean_chain = True + self.num_nodes = 1 + + def skip_test_if_missing_module(self): + self.skip_if_no_wallet() + + def setup_network(self, split=False): + self.setup_nodes() + + def run_test(self): + node = self.nodes[0] + + self.generate(node, 1, sync_fun=self.no_op) # Leave IBD + + node.createwallet(wallet_name='w0') + node.createwallet(wallet_name='w1') + node.createwallet(wallet_name='w2', disable_private_keys=True) + w0 = node.get_wallet_rpc('w0') + w1 = node.get_wallet_rpc('w1') + w2 = node.get_wallet_rpc('w2') + + self.generatetoaddress(node, COINBASE_MATURITY + 1, w0.getnewaddress()) + assert_equal(w0.getbalance(), 50.0) + assert_equal(w1.getbalance(), 0.0) + + address1 = w1.getnewaddress() + address2 = w1.getnewaddress() + + # Add address1 as watch-only to w2 + w2.importpubkey(pubkey=w1.getaddressinfo(address1)["pubkey"]) + + tx1 = node.createrawtransaction([], [{address1: 5.0}]) + tx2 = node.createrawtransaction([], [{address2: 10.0}]) + + # w0 should be unaffected, w2 should see +5 for tx1 + assert_equal(w0.simulaterawtransaction([tx1])["balance_change"], 0.0) + assert_equal(w2.simulaterawtransaction([tx1])["balance_change"], 5.0) + + # w1 should see +5 balance for tx1 + assert_equal(w1.simulaterawtransaction([tx1])["balance_change"], 5.0) + + # w0 should be unaffected, w2 should see +5 for both transactions + assert_equal(w0.simulaterawtransaction([tx1, tx2])["balance_change"], 0.0) + assert_equal(w2.simulaterawtransaction([tx1, tx2])["balance_change"], 5.0) + + # w1 should see +15 balance for both transactions + assert_equal(w1.simulaterawtransaction([tx1, tx2])["balance_change"], 15.0) + + # w0 funds transaction; it should now see a decrease in (tx fee and payment), and w1 should see the same as above + funding = w0.fundrawtransaction(tx1) + tx1 = funding["hex"] + tx1changepos = funding["changepos"] + bitcoin_fee = Decimal(funding["fee"]) + + # w0 sees fee + 5 btc decrease, w2 sees + 5 btc + assert_approx(w0.simulaterawtransaction([tx1])["balance_change"], -(Decimal("5") + bitcoin_fee)) + assert_approx(w2.simulaterawtransaction([tx1])["balance_change"], Decimal("5")) + + # w1 sees same as before + assert_equal(w1.simulaterawtransaction([tx1])["balance_change"], 5.0) + + # same inputs (tx) more than once should error + assert_raises_rpc_error(-8, "Transaction(s) are spending the same output more than once", w0.simulaterawtransaction, [tx1,tx1]) + + tx1ob = node.decoderawtransaction(tx1) + tx1hex = tx1ob["txid"] + tx1vout = 1 - tx1changepos + # tx3 spends new w1 UTXO paying to w0 + tx3 = node.createrawtransaction([{"txid": tx1hex, "vout": tx1vout}], {w0.getnewaddress(): 4.9999}) + # tx4 spends new w1 UTXO paying to w1 + tx4 = node.createrawtransaction([{"txid": tx1hex, "vout": tx1vout}], {w1.getnewaddress(): 4.9999}) + + # on their own, both should fail due to missing input(s) + assert_raises_rpc_error(-8, "One or more transaction inputs are missing or have been spent already", w0.simulaterawtransaction, [tx3]) + assert_raises_rpc_error(-8, "One or more transaction inputs are missing or have been spent already", w1.simulaterawtransaction, [tx3]) + assert_raises_rpc_error(-8, "One or more transaction inputs are missing or have been spent already", w0.simulaterawtransaction, [tx4]) + assert_raises_rpc_error(-8, "One or more transaction inputs are missing or have been spent already", w1.simulaterawtransaction, [tx4]) + + # they should succeed when including tx1: + # wallet tx3 tx4 + # w0 -5 - bitcoin_fee + 4.9999 -5 - bitcoin_fee + # w1 0 +4.9999 + assert_approx(w0.simulaterawtransaction([tx1, tx3])["balance_change"], -Decimal("5") - bitcoin_fee + Decimal("4.9999")) + assert_approx(w1.simulaterawtransaction([tx1, tx3])["balance_change"], 0) + assert_approx(w0.simulaterawtransaction([tx1, tx4])["balance_change"], -Decimal("5") - bitcoin_fee) + assert_approx(w1.simulaterawtransaction([tx1, tx4])["balance_change"], Decimal("4.9999")) + + # they should fail if attempting to include both tx3 and tx4 + assert_raises_rpc_error(-8, "Transaction(s) are spending the same output more than once", w0.simulaterawtransaction, [tx1, tx3, tx4]) + assert_raises_rpc_error(-8, "Transaction(s) are spending the same output more than once", w1.simulaterawtransaction, [tx1, tx3, tx4]) + + # send tx1 to avoid reusing same UTXO below + node.sendrawtransaction(w0.signrawtransactionwithwallet(tx1)["hex"]) + self.generate(node, 1, sync_fun=self.no_op) # Confirm tx to trigger error below + self.sync_all() + + # w0 funds transaction 2; it should now see a decrease in (tx fee and payment), and w1 should see the same as above + funding = w0.fundrawtransaction(tx2) + tx2 = funding["hex"] + bitcoin_fee2 = Decimal(funding["fee"]) + assert_approx(w0.simulaterawtransaction([tx2])["balance_change"], -(Decimal("10") + bitcoin_fee2)) + assert_approx(w1.simulaterawtransaction([tx2])["balance_change"], +(Decimal("10"))) + assert_approx(w2.simulaterawtransaction([tx2])["balance_change"], 0) + + # w0-w2 error due to tx1 already being mined + assert_raises_rpc_error(-8, "One or more transaction inputs are missing or have been spent already", w0.simulaterawtransaction, [tx1, tx2]) + assert_raises_rpc_error(-8, "One or more transaction inputs are missing or have been spent already", w1.simulaterawtransaction, [tx1, tx2]) + assert_raises_rpc_error(-8, "One or more transaction inputs are missing or have been spent already", w2.simulaterawtransaction, [tx1, tx2]) + +if __name__ == '__main__': + SimulateTxTest().main() |