2f717fb5cd
26fe9b9909Add support for descriptors to utxoupdatepsbt (Pieter Wuille)3135c1a2d2Abstract out UpdatePSBTOutput from FillPSBT (Pieter Wuille)fb90ec3c33Abstract out EvalDescriptorStringOrObject from scantxoutset (Pieter Wuille)eaf4f88734Abstract out IsSegWitOutput from utxoupdatepsbt (Pieter Wuille) Pull request description: This adds a descriptors argument to the `utxoupdatepsbt` RPC. This means: * Input and output scripts and keys will be filled in when known. * P2SH-witness inputs will be filled in from the UTXO set when a descriptor is provided that shows they're spending segwit outputs. This also moves some (newly) shared code to separate functions: `UpdatePSBTOutput` (an analogue to `SignPSBTInput`), `IsSegWitOutput`, and `EvalDescriptorStringOrObject` (implementing the string or object notation parsing used in `scantxoutset`). ACKs for top commit: jnewbery: utACK26fe9b9909laanwj: utACK26fe9b9909(will hold merging until response to promag's comments) promag: ACK26fe9b9, checked refactors and tests look comprehensive. Still missing a release note but can be added later. Tree-SHA512: 1d833b7351b59d6c5ded6da399ff371a8a2a6ad04c0a8f90e6e46105dc737fa6f2740b1e5340280d59e01f42896c40b720c042f44417e38dfbee6477b894b245
398 lines
21 KiB
Python
Executable file
398 lines
21 KiB
Python
Executable file
#!/usr/bin/env python3
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# Copyright (c) 2018-2019 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 Partially Signed Transaction RPCs.
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"""
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from decimal import Decimal
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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_equal,
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assert_greater_than,
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assert_raises_rpc_error,
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connect_nodes_bi,
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disconnect_nodes,
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find_output,
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)
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import json
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import os
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MAX_BIP125_RBF_SEQUENCE = 0xfffffffd
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# Create one-input, one-output, no-fee transaction:
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class PSBTTest(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 = 3
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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 test_utxo_conversion(self):
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mining_node = self.nodes[2]
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offline_node = self.nodes[0]
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online_node = self.nodes[1]
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# Disconnect offline node from others
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disconnect_nodes(offline_node, 1)
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disconnect_nodes(online_node, 0)
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disconnect_nodes(offline_node, 2)
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disconnect_nodes(mining_node, 0)
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# Mine a transaction that credits the offline address
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offline_addr = offline_node.getnewaddress(address_type="p2sh-segwit")
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online_addr = online_node.getnewaddress(address_type="p2sh-segwit")
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online_node.importaddress(offline_addr, "", False)
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mining_node.sendtoaddress(address=offline_addr, amount=1.0)
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mining_node.generate(nblocks=1)
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self.sync_blocks([mining_node, online_node])
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# Construct an unsigned PSBT on the online node (who doesn't know the output is Segwit, so will include a non-witness UTXO)
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utxos = online_node.listunspent(addresses=[offline_addr])
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raw = online_node.createrawtransaction([{"txid":utxos[0]["txid"], "vout":utxos[0]["vout"]}],[{online_addr:0.9999}])
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psbt = online_node.walletprocesspsbt(online_node.converttopsbt(raw))["psbt"]
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assert "non_witness_utxo" in mining_node.decodepsbt(psbt)["inputs"][0]
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# Have the offline node sign the PSBT (which will update the UTXO to segwit)
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signed_psbt = offline_node.walletprocesspsbt(psbt)["psbt"]
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assert "witness_utxo" in mining_node.decodepsbt(signed_psbt)["inputs"][0]
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# Make sure we can mine the resulting transaction
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txid = mining_node.sendrawtransaction(mining_node.finalizepsbt(signed_psbt)["hex"])
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mining_node.generate(1)
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self.sync_blocks([mining_node, online_node])
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assert_equal(online_node.gettxout(txid,0)["confirmations"], 1)
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# Reconnect
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connect_nodes_bi(self.nodes, 0, 1)
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connect_nodes_bi(self.nodes, 0, 2)
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def run_test(self):
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# Create and fund a raw tx for sending 10 BTC
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psbtx1 = self.nodes[0].walletcreatefundedpsbt([], {self.nodes[2].getnewaddress():10})['psbt']
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# Node 1 should not be able to add anything to it but still return the psbtx same as before
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psbtx = self.nodes[1].walletprocesspsbt(psbtx1)['psbt']
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assert_equal(psbtx1, psbtx)
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# Sign the transaction and send
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signed_tx = self.nodes[0].walletprocesspsbt(psbtx)['psbt']
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final_tx = self.nodes[0].finalizepsbt(signed_tx)['hex']
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self.nodes[0].sendrawtransaction(final_tx)
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# Create p2sh, p2wpkh, and p2wsh addresses
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pubkey0 = self.nodes[0].getaddressinfo(self.nodes[0].getnewaddress())['pubkey']
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pubkey1 = self.nodes[1].getaddressinfo(self.nodes[1].getnewaddress())['pubkey']
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pubkey2 = self.nodes[2].getaddressinfo(self.nodes[2].getnewaddress())['pubkey']
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p2sh = self.nodes[1].addmultisigaddress(2, [pubkey0, pubkey1, pubkey2], "", "legacy")['address']
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p2wsh = self.nodes[1].addmultisigaddress(2, [pubkey0, pubkey1, pubkey2], "", "bech32")['address']
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p2sh_p2wsh = self.nodes[1].addmultisigaddress(2, [pubkey0, pubkey1, pubkey2], "", "p2sh-segwit")['address']
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p2wpkh = self.nodes[1].getnewaddress("", "bech32")
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p2pkh = self.nodes[1].getnewaddress("", "legacy")
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p2sh_p2wpkh = self.nodes[1].getnewaddress("", "p2sh-segwit")
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# fund those addresses
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rawtx = self.nodes[0].createrawtransaction([], {p2sh:10, p2wsh:10, p2wpkh:10, p2sh_p2wsh:10, p2sh_p2wpkh:10, p2pkh:10})
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rawtx = self.nodes[0].fundrawtransaction(rawtx, {"changePosition":3})
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signed_tx = self.nodes[0].signrawtransactionwithwallet(rawtx['hex'])['hex']
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txid = self.nodes[0].sendrawtransaction(signed_tx)
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self.nodes[0].generate(6)
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self.sync_all()
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# Find the output pos
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p2sh_pos = -1
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p2wsh_pos = -1
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p2wpkh_pos = -1
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p2pkh_pos = -1
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p2sh_p2wsh_pos = -1
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p2sh_p2wpkh_pos = -1
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decoded = self.nodes[0].decoderawtransaction(signed_tx)
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for out in decoded['vout']:
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if out['scriptPubKey']['addresses'][0] == p2sh:
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p2sh_pos = out['n']
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elif out['scriptPubKey']['addresses'][0] == p2wsh:
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p2wsh_pos = out['n']
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elif out['scriptPubKey']['addresses'][0] == p2wpkh:
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p2wpkh_pos = out['n']
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elif out['scriptPubKey']['addresses'][0] == p2sh_p2wsh:
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p2sh_p2wsh_pos = out['n']
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elif out['scriptPubKey']['addresses'][0] == p2sh_p2wpkh:
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p2sh_p2wpkh_pos = out['n']
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elif out['scriptPubKey']['addresses'][0] == p2pkh:
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p2pkh_pos = out['n']
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# spend single key from node 1
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rawtx = self.nodes[1].walletcreatefundedpsbt([{"txid":txid,"vout":p2wpkh_pos},{"txid":txid,"vout":p2sh_p2wpkh_pos},{"txid":txid,"vout":p2pkh_pos}], {self.nodes[1].getnewaddress():29.99})['psbt']
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walletprocesspsbt_out = self.nodes[1].walletprocesspsbt(rawtx)
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assert_equal(walletprocesspsbt_out['complete'], True)
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self.nodes[1].sendrawtransaction(self.nodes[1].finalizepsbt(walletprocesspsbt_out['psbt'])['hex'])
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# feeRate of 0.1 BTC / KB produces a total fee slightly below -maxtxfee (~0.05280000):
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res = self.nodes[1].walletcreatefundedpsbt([{"txid":txid,"vout":p2wpkh_pos},{"txid":txid,"vout":p2sh_p2wpkh_pos},{"txid":txid,"vout":p2pkh_pos}], {self.nodes[1].getnewaddress():29.99}, 0, {"feeRate": 0.1})
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assert_greater_than(res["fee"], 0.05)
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assert_greater_than(0.06, res["fee"])
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# feeRate of 10 BTC / KB produces a total fee well above -maxtxfee
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# previously this was silenty capped at -maxtxfee
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assert_raises_rpc_error(-4, "Fee exceeds maximum configured by -maxtxfee", self.nodes[1].walletcreatefundedpsbt, [{"txid":txid,"vout":p2wpkh_pos},{"txid":txid,"vout":p2sh_p2wpkh_pos},{"txid":txid,"vout":p2pkh_pos}], {self.nodes[1].getnewaddress():29.99}, 0, {"feeRate": 10})
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# partially sign multisig things with node 1
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psbtx = self.nodes[1].walletcreatefundedpsbt([{"txid":txid,"vout":p2wsh_pos},{"txid":txid,"vout":p2sh_pos},{"txid":txid,"vout":p2sh_p2wsh_pos}], {self.nodes[1].getnewaddress():29.99})['psbt']
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walletprocesspsbt_out = self.nodes[1].walletprocesspsbt(psbtx)
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psbtx = walletprocesspsbt_out['psbt']
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assert_equal(walletprocesspsbt_out['complete'], False)
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# partially sign with node 2. This should be complete and sendable
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walletprocesspsbt_out = self.nodes[2].walletprocesspsbt(psbtx)
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assert_equal(walletprocesspsbt_out['complete'], True)
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self.nodes[2].sendrawtransaction(self.nodes[2].finalizepsbt(walletprocesspsbt_out['psbt'])['hex'])
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# check that walletprocesspsbt fails to decode a non-psbt
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rawtx = self.nodes[1].createrawtransaction([{"txid":txid,"vout":p2wpkh_pos}], {self.nodes[1].getnewaddress():9.99})
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assert_raises_rpc_error(-22, "TX decode failed", self.nodes[1].walletprocesspsbt, rawtx)
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# Convert a non-psbt to psbt and make sure we can decode it
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rawtx = self.nodes[0].createrawtransaction([], {self.nodes[1].getnewaddress():10})
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rawtx = self.nodes[0].fundrawtransaction(rawtx)
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new_psbt = self.nodes[0].converttopsbt(rawtx['hex'])
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self.nodes[0].decodepsbt(new_psbt)
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# Make sure that a non-psbt with signatures cannot be converted
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# Error could be either "TX decode failed" (segwit inputs causes parsing to fail) or "Inputs must not have scriptSigs and scriptWitnesses"
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# We must set iswitness=True because the serialized transaction has inputs and is therefore a witness transaction
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signedtx = self.nodes[0].signrawtransactionwithwallet(rawtx['hex'])
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assert_raises_rpc_error(-22, "", self.nodes[0].converttopsbt, hexstring=signedtx['hex'], iswitness=True)
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assert_raises_rpc_error(-22, "", self.nodes[0].converttopsbt, hexstring=signedtx['hex'], permitsigdata=False, iswitness=True)
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# Unless we allow it to convert and strip signatures
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self.nodes[0].converttopsbt(signedtx['hex'], True)
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# Explicitly allow converting non-empty txs
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new_psbt = self.nodes[0].converttopsbt(rawtx['hex'])
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self.nodes[0].decodepsbt(new_psbt)
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# Create outputs to nodes 1 and 2
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node1_addr = self.nodes[1].getnewaddress()
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node2_addr = self.nodes[2].getnewaddress()
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txid1 = self.nodes[0].sendtoaddress(node1_addr, 13)
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txid2 = self.nodes[0].sendtoaddress(node2_addr, 13)
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blockhash = self.nodes[0].generate(6)[0]
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self.sync_all()
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vout1 = find_output(self.nodes[1], txid1, 13, blockhash=blockhash)
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vout2 = find_output(self.nodes[2], txid2, 13, blockhash=blockhash)
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# Create a psbt spending outputs from nodes 1 and 2
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psbt_orig = self.nodes[0].createpsbt([{"txid":txid1, "vout":vout1}, {"txid":txid2, "vout":vout2}], {self.nodes[0].getnewaddress():25.999})
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# Update psbts, should only have data for one input and not the other
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psbt1 = self.nodes[1].walletprocesspsbt(psbt_orig)['psbt']
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psbt1_decoded = self.nodes[0].decodepsbt(psbt1)
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assert psbt1_decoded['inputs'][0] and not psbt1_decoded['inputs'][1]
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psbt2 = self.nodes[2].walletprocesspsbt(psbt_orig)['psbt']
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psbt2_decoded = self.nodes[0].decodepsbt(psbt2)
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assert not psbt2_decoded['inputs'][0] and psbt2_decoded['inputs'][1]
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# Combine, finalize, and send the psbts
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combined = self.nodes[0].combinepsbt([psbt1, psbt2])
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finalized = self.nodes[0].finalizepsbt(combined)['hex']
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self.nodes[0].sendrawtransaction(finalized)
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self.nodes[0].generate(6)
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self.sync_all()
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# Test additional args in walletcreatepsbt
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# Make sure both pre-included and funded inputs
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# have the correct sequence numbers based on
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# replaceable arg
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block_height = self.nodes[0].getblockcount()
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unspent = self.nodes[0].listunspent()[0]
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psbtx_info = self.nodes[0].walletcreatefundedpsbt([{"txid":unspent["txid"], "vout":unspent["vout"]}], [{self.nodes[2].getnewaddress():unspent["amount"]+1}], block_height+2, {"replaceable":True}, False)
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decoded_psbt = self.nodes[0].decodepsbt(psbtx_info["psbt"])
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for tx_in, psbt_in in zip(decoded_psbt["tx"]["vin"], decoded_psbt["inputs"]):
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assert_equal(tx_in["sequence"], MAX_BIP125_RBF_SEQUENCE)
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assert "bip32_derivs" not in psbt_in
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assert_equal(decoded_psbt["tx"]["locktime"], block_height+2)
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# Same construction with only locktime set
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psbtx_info = self.nodes[0].walletcreatefundedpsbt([{"txid":unspent["txid"], "vout":unspent["vout"]}], [{self.nodes[2].getnewaddress():unspent["amount"]+1}], block_height, {}, True)
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decoded_psbt = self.nodes[0].decodepsbt(psbtx_info["psbt"])
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for tx_in, psbt_in in zip(decoded_psbt["tx"]["vin"], decoded_psbt["inputs"]):
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assert tx_in["sequence"] > MAX_BIP125_RBF_SEQUENCE
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assert "bip32_derivs" in psbt_in
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assert_equal(decoded_psbt["tx"]["locktime"], block_height)
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# Same construction without optional arguments
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psbtx_info = self.nodes[0].walletcreatefundedpsbt([{"txid":unspent["txid"], "vout":unspent["vout"]}], [{self.nodes[2].getnewaddress():unspent["amount"]+1}])
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decoded_psbt = self.nodes[0].decodepsbt(psbtx_info["psbt"])
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for tx_in in decoded_psbt["tx"]["vin"]:
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assert tx_in["sequence"] > MAX_BIP125_RBF_SEQUENCE
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assert_equal(decoded_psbt["tx"]["locktime"], 0)
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# Make sure change address wallet does not have P2SH innerscript access to results in success
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# when attempting BnB coin selection
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self.nodes[0].walletcreatefundedpsbt([], [{self.nodes[2].getnewaddress():unspent["amount"]+1}], block_height+2, {"changeAddress":self.nodes[1].getnewaddress()}, False)
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# Regression test for 14473 (mishandling of already-signed witness transaction):
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psbtx_info = self.nodes[0].walletcreatefundedpsbt([{"txid":unspent["txid"], "vout":unspent["vout"]}], [{self.nodes[2].getnewaddress():unspent["amount"]+1}])
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complete_psbt = self.nodes[0].walletprocesspsbt(psbtx_info["psbt"])
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double_processed_psbt = self.nodes[0].walletprocesspsbt(complete_psbt["psbt"])
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assert_equal(complete_psbt, double_processed_psbt)
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# We don't care about the decode result, but decoding must succeed.
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self.nodes[0].decodepsbt(double_processed_psbt["psbt"])
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# BIP 174 Test Vectors
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# Check that unknown values are just passed through
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unknown_psbt = "cHNidP8BAD8CAAAAAf//////////////////////////////////////////AAAAAAD/////AQAAAAAAAAAAA2oBAAAAAAAACg8BAgMEBQYHCAkPAQIDBAUGBwgJCgsMDQ4PAAA="
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unknown_out = self.nodes[0].walletprocesspsbt(unknown_psbt)['psbt']
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assert_equal(unknown_psbt, unknown_out)
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# Open the data file
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with open(os.path.join(os.path.dirname(os.path.realpath(__file__)), 'data/rpc_psbt.json'), encoding='utf-8') as f:
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d = json.load(f)
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invalids = d['invalid']
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valids = d['valid']
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creators = d['creator']
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signers = d['signer']
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combiners = d['combiner']
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finalizers = d['finalizer']
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extractors = d['extractor']
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# Invalid PSBTs
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for invalid in invalids:
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assert_raises_rpc_error(-22, "TX decode failed", self.nodes[0].decodepsbt, invalid)
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# Valid PSBTs
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for valid in valids:
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self.nodes[0].decodepsbt(valid)
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# Creator Tests
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for creator in creators:
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created_tx = self.nodes[0].createpsbt(creator['inputs'], creator['outputs'])
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assert_equal(created_tx, creator['result'])
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# Signer tests
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for i, signer in enumerate(signers):
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self.nodes[2].createwallet("wallet{}".format(i))
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wrpc = self.nodes[2].get_wallet_rpc("wallet{}".format(i))
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for key in signer['privkeys']:
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wrpc.importprivkey(key)
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signed_tx = wrpc.walletprocesspsbt(signer['psbt'])['psbt']
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assert_equal(signed_tx, signer['result'])
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# Combiner test
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for combiner in combiners:
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combined = self.nodes[2].combinepsbt(combiner['combine'])
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assert_equal(combined, combiner['result'])
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# Empty combiner test
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assert_raises_rpc_error(-8, "Parameter 'txs' cannot be empty", self.nodes[0].combinepsbt, [])
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# Finalizer test
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for finalizer in finalizers:
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finalized = self.nodes[2].finalizepsbt(finalizer['finalize'], False)['psbt']
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assert_equal(finalized, finalizer['result'])
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# Extractor test
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for extractor in extractors:
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extracted = self.nodes[2].finalizepsbt(extractor['extract'], True)['hex']
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assert_equal(extracted, extractor['result'])
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# Unload extra wallets
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for i, signer in enumerate(signers):
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self.nodes[2].unloadwallet("wallet{}".format(i))
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self.test_utxo_conversion()
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# Test that psbts with p2pkh outputs are created properly
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p2pkh = self.nodes[0].getnewaddress(address_type='legacy')
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psbt = self.nodes[1].walletcreatefundedpsbt([], [{p2pkh : 1}], 0, {"includeWatching" : True}, True)
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self.nodes[0].decodepsbt(psbt['psbt'])
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# Test decoding error: invalid base64
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assert_raises_rpc_error(-22, "TX decode failed invalid base64", self.nodes[0].decodepsbt, ";definitely not base64;")
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# Send to all types of addresses
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addr1 = self.nodes[1].getnewaddress("", "bech32")
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txid1 = self.nodes[0].sendtoaddress(addr1, 11)
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vout1 = find_output(self.nodes[0], txid1, 11)
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addr2 = self.nodes[1].getnewaddress("", "legacy")
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txid2 = self.nodes[0].sendtoaddress(addr2, 11)
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vout2 = find_output(self.nodes[0], txid2, 11)
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addr3 = self.nodes[1].getnewaddress("", "p2sh-segwit")
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txid3 = self.nodes[0].sendtoaddress(addr3, 11)
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vout3 = find_output(self.nodes[0], txid3, 11)
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self.sync_all()
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def test_psbt_input_keys(psbt_input, keys):
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"""Check that the psbt input has only the expected keys."""
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assert_equal(set(keys), set(psbt_input.keys()))
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# Create a PSBT. None of the inputs are filled initially
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psbt = self.nodes[1].createpsbt([{"txid":txid1, "vout":vout1},{"txid":txid2, "vout":vout2},{"txid":txid3, "vout":vout3}], {self.nodes[0].getnewaddress():32.999})
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decoded = self.nodes[1].decodepsbt(psbt)
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test_psbt_input_keys(decoded['inputs'][0], [])
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test_psbt_input_keys(decoded['inputs'][1], [])
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test_psbt_input_keys(decoded['inputs'][2], [])
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# Update a PSBT with UTXOs from the node
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# Bech32 inputs should be filled with witness UTXO. Other inputs should not be filled because they are non-witness
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updated = self.nodes[1].utxoupdatepsbt(psbt)
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decoded = self.nodes[1].decodepsbt(updated)
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test_psbt_input_keys(decoded['inputs'][0], ['witness_utxo'])
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test_psbt_input_keys(decoded['inputs'][1], [])
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test_psbt_input_keys(decoded['inputs'][2], [])
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# Try again, now while providing descriptors, making P2SH-segwit work, and causing bip32_derivs and redeem_script to be filled in
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descs = [self.nodes[1].getaddressinfo(addr)['desc'] for addr in [addr1,addr2,addr3]]
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updated = self.nodes[1].utxoupdatepsbt(psbt, descs)
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decoded = self.nodes[1].decodepsbt(updated)
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test_psbt_input_keys(decoded['inputs'][0], ['witness_utxo', 'bip32_derivs'])
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test_psbt_input_keys(decoded['inputs'][1], [])
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test_psbt_input_keys(decoded['inputs'][2], ['witness_utxo', 'bip32_derivs', 'redeem_script'])
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# Two PSBTs with a common input should not be joinable
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psbt1 = self.nodes[1].createpsbt([{"txid":txid1, "vout":vout1}], {self.nodes[0].getnewaddress():Decimal('10.999')})
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assert_raises_rpc_error(-8, "exists in multiple PSBTs", self.nodes[1].joinpsbts, [psbt1, updated])
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# Join two distinct PSBTs
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addr4 = self.nodes[1].getnewaddress("", "p2sh-segwit")
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txid4 = self.nodes[0].sendtoaddress(addr4, 5)
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vout4 = find_output(self.nodes[0], txid4, 5)
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self.nodes[0].generate(6)
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self.sync_all()
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psbt2 = self.nodes[1].createpsbt([{"txid":txid4, "vout":vout4}], {self.nodes[0].getnewaddress():Decimal('4.999')})
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psbt2 = self.nodes[1].walletprocesspsbt(psbt2)['psbt']
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psbt2_decoded = self.nodes[0].decodepsbt(psbt2)
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assert "final_scriptwitness" in psbt2_decoded['inputs'][0] and "final_scriptSig" in psbt2_decoded['inputs'][0]
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joined = self.nodes[0].joinpsbts([psbt, psbt2])
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joined_decoded = self.nodes[0].decodepsbt(joined)
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assert len(joined_decoded['inputs']) == 4 and len(joined_decoded['outputs']) == 2 and "final_scriptwitness" not in joined_decoded['inputs'][3] and "final_scriptSig" not in joined_decoded['inputs'][3]
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# Newly created PSBT needs UTXOs and updating
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addr = self.nodes[1].getnewaddress("", "p2sh-segwit")
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txid = self.nodes[0].sendtoaddress(addr, 7)
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addrinfo = self.nodes[1].getaddressinfo(addr)
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blockhash = self.nodes[0].generate(6)[0]
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self.sync_all()
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vout = find_output(self.nodes[0], txid, 7, blockhash=blockhash)
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psbt = self.nodes[1].createpsbt([{"txid":txid, "vout":vout}], {self.nodes[0].getnewaddress("", "p2sh-segwit"):Decimal('6.999')})
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analyzed = self.nodes[0].analyzepsbt(psbt)
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assert not analyzed['inputs'][0]['has_utxo'] and not analyzed['inputs'][0]['is_final'] and analyzed['inputs'][0]['next'] == 'updater' and analyzed['next'] == 'updater'
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# After update with wallet, only needs signing
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updated = self.nodes[1].walletprocesspsbt(psbt, False, 'ALL', True)['psbt']
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analyzed = self.nodes[0].analyzepsbt(updated)
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assert analyzed['inputs'][0]['has_utxo'] and not analyzed['inputs'][0]['is_final'] and analyzed['inputs'][0]['next'] == 'signer' and analyzed['next'] == 'signer' and analyzed['inputs'][0]['missing']['signatures'][0] == addrinfo['embedded']['witness_program']
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# Check fee and size things
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assert analyzed['fee'] == Decimal('0.001') and analyzed['estimated_vsize'] == 134 and analyzed['estimated_feerate'] == Decimal('0.00746268')
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# After signing and finalizing, needs extracting
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signed = self.nodes[1].walletprocesspsbt(updated)['psbt']
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analyzed = self.nodes[0].analyzepsbt(signed)
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assert analyzed['inputs'][0]['has_utxo'] and analyzed['inputs'][0]['is_final'] and analyzed['next'] == 'extractor'
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if __name__ == '__main__':
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PSBTTest().main()
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