Add rpc test for segwit

Amended by Pieter Wuille to use multisig 1-of-1 for P2WSH tests, and BIP9
based switchover logic.

Author: morcos

qa/rpc-tests/segwit.py

@@ -0,0 +1,215 @@
+#!/usr/bin/env python2
+# Copyright (c) 2014 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 the SegWit changeover logic
+#
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import *
+import os
+import shutil
+import hashlib
+from binascii import hexlify
+
+NODE_0 = 0
+NODE_1 = 1
+NODE_2 = 2
+WIT_V0 = 0
+WIT_V1 = 1
+
+def sha256(s):
+    return hashlib.new('sha256', s).digest()
+
+def ripemd160(s):
+    return hashlib.new('ripemd160', s).digest()
+
+def witness_script(version, pubkey):
+    if (version == 0):
+        pubkeyhash = hexlify(ripemd160(sha256(pubkey.decode("hex"))))
+        pkscript = "0014" + pubkeyhash
+    elif (version == 1):
+        # 1-of-1 multisig
+        scripthash = hexlify(sha256(("5121" + pubkey + "51ae").decode("hex")))
+        pkscript = "0020" + scripthash
+    else:
+        assert("Wrong version" == "0 or 1")
+    return pkscript
+
+def addlength(script):
+    scriptlen = format(len(script)/2, 'x')
+    assert(len(scriptlen) == 2)
+    return scriptlen + script
+
+def create_witnessprogram(version, node, utxo, pubkey, encode_p2sh, amount):
+    pkscript = witness_script(version, pubkey);
+    if (encode_p2sh):
+        p2sh_hash = hexlify(ripemd160(sha256(pkscript.decode("hex"))))
+        pkscript = "a914"+p2sh_hash+"87"
+    inputs = []
+    outputs = {}
+    inputs.append({ "txid" : utxo["txid"], "vout" : utxo["vout"]} )
+    DUMMY_P2SH = "2MySexEGVzZpRgNQ1JdjdP5bRETznm3roQ2" # P2SH of "OP_1 OP_DROP"
+    outputs[DUMMY_P2SH] = amount
+    tx_to_witness = node.createrawtransaction(inputs,outputs)
+    #replace dummy output with our own
+    tx_to_witness = tx_to_witness[0:110] + addlength(pkscript) + tx_to_witness[-8:]
+    return tx_to_witness
+
+def send_to_witness(version, node, utxo, pubkey, encode_p2sh, amount, sign=True, insert_redeem_script=""):
+    tx_to_witness = create_witnessprogram(version, node, utxo, pubkey, encode_p2sh, amount)
+    if (sign):
+        signed = node.signrawtransaction(tx_to_witness)
+        return node.sendrawtransaction(signed["hex"])
+    else:
+        if (insert_redeem_script):
+            tx_to_witness = tx_to_witness[0:82] + addlength(insert_redeem_script) + tx_to_witness[84:]
+
+    return node.sendrawtransaction(tx_to_witness)
+
+def getutxo(txid):
+    utxo = {}
+    utxo["vout"] = 0
+    utxo["txid"] = txid
+    return utxo
+
+class SegWitTest(BitcoinTestFramework):
+
+    def setup_chain(self):
+        print("Initializing test directory "+self.options.tmpdir)
+        initialize_chain_clean(self.options.tmpdir, 3)
+
+    def setup_network(self):
+        self.nodes = []
+        self.nodes.append(start_node(0, self.options.tmpdir, ["-logtimemicros", "-debug"]))
+        self.nodes.append(start_node(1, self.options.tmpdir, ["-logtimemicros", "-debug", "-blockversion=4", "-promiscuousmempoolflags=517", "-prematurewitness"]))
+        self.nodes.append(start_node(2, self.options.tmpdir, ["-logtimemicros", "-debug", "-blockversion=536870915", "-promiscuousmempoolflags=517", "-prematurewitness"]))
+        connect_nodes(self.nodes[1], 0)
+        connect_nodes(self.nodes[2], 1)
+        connect_nodes(self.nodes[0], 2)
+        self.is_network_split = False
+        self.sync_all()
+
+    def success_mine(self, node, txid, sign, redeem_script=""):
+        send_to_witness(1, node, getutxo(txid), self.pubkey[0], False, Decimal("49.998"), sign, redeem_script)
+        block = node.generate(1)
+        assert_equal(len(node.getblock(block[0])["tx"]), 2)
+        sync_blocks(self.nodes)
+
+    def skip_mine(self, node, txid, sign, redeem_script=""):
+        send_to_witness(1, node, getutxo(txid), self.pubkey[0], False, Decimal("49.998"), sign, redeem_script)
+        block = node.generate(1)
+        assert_equal(len(node.getblock(block[0])["tx"]), 1)
+        sync_blocks(self.nodes)
+
+    def fail_accept(self, node, txid, sign, redeem_script=""):
+        try:
+            send_to_witness(1, node, getutxo(txid), self.pubkey[0], False, Decimal("49.998"), sign, redeem_script)
+        except JSONRPCException as exp:
+            assert(exp.error["code"] == -26)
+        else:
+            raise AssertionError("Tx should not have been accepted")
+
+    def fail_mine(self, node, txid, sign, redeem_script=""):
+        send_to_witness(1, node, getutxo(txid), self.pubkey[0], False, Decimal("49.998"), sign, redeem_script)
+        try:
+            node.generate(1)
+        except JSONRPCException as exp:
+            assert(exp.error["code"] == -1)
+        else:
+            raise AssertionError("Created valid block when TestBlockValidity should have failed")
+        sync_blocks(self.nodes)
+
+    def run_test(self):
+        self.nodes[0].generate(160) #block 160
+
+        self.pubkey = []
+        p2sh_ids = [] # p2sh_ids[NODE][VER] is an array of txids that spend to a witness version VER pkscript to an address for NODE embedded in p2sh
+        wit_ids = [] # wit_ids[NODE][VER] is an array of txids that spend to a witness version VER pkscript to an address for NODE via bare witness
+        for i in xrange(3):
+            newaddress = self.nodes[i].getnewaddress()
+            self.pubkey.append(self.nodes[i].validateaddress(newaddress)["pubkey"])
+            multiaddress = self.nodes[i].addmultisigaddress(1, [self.pubkey[-1]])
+            self.nodes[i].addwitnessaddress(newaddress)
+            self.nodes[i].addwitnessaddress(multiaddress)
+            p2sh_ids.append([])
+            wit_ids.append([])
+            for v in xrange(2):
+                p2sh_ids[i].append([])
+                wit_ids[i].append([])
+
+        for i in xrange(5):
+            for n in xrange(3):
+                for v in xrange(2):
+                    wit_ids[n][v].append(send_to_witness(v, self.nodes[0], self.nodes[0].listunspent()[0], self.pubkey[n], False, Decimal("49.999")))
+                    p2sh_ids[n][v].append(send_to_witness(v, self.nodes[0], self.nodes[0].listunspent()[0], self.pubkey[n], True, Decimal("49.999")))
+
+        self.nodes[0].generate(1) #block 161
+        sync_blocks(self.nodes)
+
+        # Make sure all nodes recognize the transactions as theirs
+        assert_equal(self.nodes[0].getbalance(), 60*50 - 60*50 + 20*Decimal("49.999") + 50)
+        assert_equal(self.nodes[1].getbalance(), 20*Decimal("49.999"))
+        assert_equal(self.nodes[2].getbalance(), 20*Decimal("49.999"))
+
+        self.nodes[0].generate(262) #block 423
+        sync_blocks(self.nodes)
+
+        print "Verify default node can't accept any witness format txs before fork"
+        # unsigned, no scriptsig
+        self.fail_accept(self.nodes[0], wit_ids[NODE_0][WIT_V0][0], False)
+        self.fail_accept(self.nodes[0], wit_ids[NODE_0][WIT_V1][0], False)
+        self.fail_accept(self.nodes[0], p2sh_ids[NODE_0][WIT_V0][0], False)
+        self.fail_accept(self.nodes[0], p2sh_ids[NODE_0][WIT_V1][0], False)
+        # unsigned with redeem script
+        self.fail_accept(self.nodes[0], p2sh_ids[NODE_0][WIT_V0][0], False, addlength(witness_script(0, self.pubkey[0])))
+        self.fail_accept(self.nodes[0], p2sh_ids[NODE_0][WIT_V1][0], False, addlength(witness_script(1, self.pubkey[0])))
+        # signed
+        self.fail_accept(self.nodes[0], wit_ids[NODE_0][WIT_V0][0], True)
+        self.fail_accept(self.nodes[0], wit_ids[NODE_0][WIT_V1][0], True)
+        self.fail_accept(self.nodes[0], p2sh_ids[NODE_0][WIT_V0][0], True)
+        self.fail_accept(self.nodes[0], p2sh_ids[NODE_0][WIT_V1][0], True)
+
+        print "Verify witness txs are skipped for mining before the fork"
+        self.skip_mine(self.nodes[2], wit_ids[NODE_2][WIT_V0][0], True) #block 424
+        self.skip_mine(self.nodes[2], wit_ids[NODE_2][WIT_V1][0], True) #block 425
+        self.skip_mine(self.nodes[2], p2sh_ids[NODE_2][WIT_V0][0], True) #block 426
+        self.skip_mine(self.nodes[2], p2sh_ids[NODE_2][WIT_V1][0], True) #block 427
+
+        # TODO: An old node would see these txs without witnesses and be able to mine them
+
+        print "Verify unsigned bare witness txs in versionbits-setting blocks are valid before the fork"
+        self.success_mine(self.nodes[2], wit_ids[NODE_2][WIT_V0][1], False) #block 428
+        self.success_mine(self.nodes[2], wit_ids[NODE_2][WIT_V1][1], False) #block 429
+
+        print "Verify unsigned p2sh witness txs without a redeem script are invalid"
+        self.fail_accept(self.nodes[2], p2sh_ids[NODE_2][WIT_V0][1], False)
+        self.fail_accept(self.nodes[2], p2sh_ids[NODE_2][WIT_V1][1], False)
+
+        print "Verify unsigned p2sh witness txs with a redeem script in versionbits-settings blocks are valid before the fork"
+        self.success_mine(self.nodes[2], p2sh_ids[NODE_2][WIT_V0][1], False, addlength(witness_script(0, self.pubkey[2]))) #block 430
+        self.success_mine(self.nodes[2], p2sh_ids[NODE_2][WIT_V1][1], False, addlength(witness_script(1, self.pubkey[2]))) #block 431
+
+        print "Verify previous witness txs skipped for mining can now be mined"
+        assert_equal(len(self.nodes[2].getrawmempool()), 4)
+        block = self.nodes[2].generate(1) #block 432 (first block with new rules; 432 = 144 * 3)
+        sync_blocks(self.nodes)
+        assert_equal(len(self.nodes[2].getrawmempool()), 0)
+        assert_equal(len(self.nodes[2].getblock(block[0])["tx"]), 5)
+
+        print "Verify witness txs without witness data are invalid after the fork"
+        self.fail_mine(self.nodes[2], wit_ids[NODE_2][WIT_V0][2], False)
+        self.fail_mine(self.nodes[2], wit_ids[NODE_2][WIT_V1][2], False)
+        self.fail_mine(self.nodes[2], p2sh_ids[NODE_2][WIT_V0][2], False, addlength(witness_script(0, self.pubkey[2])))
+        self.fail_mine(self.nodes[2], p2sh_ids[NODE_2][WIT_V1][2], False, addlength(witness_script(1, self.pubkey[2])))
+
+        print "Verify default node can now use witness txs"
+        self.success_mine(self.nodes[0], wit_ids[NODE_0][WIT_V0][0], True) #block 432
+        self.success_mine(self.nodes[0], wit_ids[NODE_0][WIT_V1][0], True) #block 433
+        self.success_mine(self.nodes[0], p2sh_ids[NODE_0][WIT_V0][0], True) #block 434
+        self.success_mine(self.nodes[0], p2sh_ids[NODE_0][WIT_V1][0], True) #block 435
+
+if __name__ == '__main__':
+    SegWitTest().main()