Merge #20292: test: Fix intermittent feature_taproot issue

fab900802d74799ac1004265951be1b66e70cf76 ci: Bump timeout factor (MarcoFalke)
50eb0c2512842b96a0128a7d592a357665f6e006 Small improvements to the Taproot functional tests (Pieter Wuille)
fac865b72d5c0e01fce74b84ab21e5ebbf069327 test: Fix intermittent feature_taproot issue (MarcoFalke)
fa1dea19fc50db449386c9f969adc5ad327a0f0d test: Fix deser issue in create_block (MarcoFalke)
fa762a3fd43e49f8572be69e9129cd9170855f76 test: Remove unused unnamed parameter from block.serialize call (MarcoFalke)

Pull request description:

  This fixes three bugs. Also, fix some unrelated code style issues.

  Please refer to the commit messages for more information.

ACKs for top commit:
  laanwj:
    Code review ACK fab900802d74799ac1004265951be1b66e70cf76

Tree-SHA512: 4e22c240cf345710f3b21fc63243126b90014b3656d0865ff87156e958dd1442e6572c6c0a5701dbbe503eee931a0ceb66eeeb3553137f3d1f5afd27a9f9cada

3 files changed, 23 insertions, 16 deletions

diff --git a/test/functional/feature_taproot.py b/test/functional/feature_taproot.py
index 3e47e24a3b..6e28cfb265 100755
--- a/test/functional/feature_taproot.py
+++ b/test/functional/feature_taproot.py
@@ -9,6 +9,7 @@ from test_framework.blocktools import (
     create_block,
     add_witness_commitment,
     MAX_BLOCK_SIGOPS_WEIGHT,
+    NORMAL_GBT_REQUEST_PARAMS,
     WITNESS_SCALE_FACTOR,
 )
 from test_framework.messages import (
@@ -1199,7 +1200,7 @@ class TaprootTest(BitcoinTestFramework):
         self.num_nodes = 2
         self.setup_clean_chain = True
         # Node 0 has Taproot inactive, Node 1 active.
-        self.extra_args = [["-whitelist=127.0.0.1", "-par=1", "-vbparams=taproot:1:1"], ["-whitelist=127.0.0.1", "-par=1"]]
+        self.extra_args = [["-par=1", "-vbparams=taproot:1:1"], ["-par=1"]]
 
     def block_submit(self, node, txs, msg, err_msg, cb_pubkey=None, fees=0, sigops_weight=0, witness=False, accept=False):
 
@@ -1218,7 +1219,7 @@ class TaprootTest(BitcoinTestFramework):
         witness and add_witness_commitment(block)
         block.rehash()
         block.solve()
-        block_response = node.submitblock(block.serialize(True).hex())
+        block_response = node.submitblock(block.serialize().hex())
         if err_msg is not None:
             assert block_response is not None and err_msg in block_response, "Missing error message '%s' from block response '%s': %s" % (err_msg, "(None)" if block_response is None else block_response, msg)
         if (accept):
@@ -1436,17 +1437,27 @@ class TaprootTest(BitcoinTestFramework):
         self.log.info("  - Done")
 
     def run_test(self):
-        self.connect_nodes(0, 1)
-
         # Post-taproot activation tests go first (pre-taproot tests' blocks are invalid post-taproot).
         self.log.info("Post-activation tests...")
         self.nodes[1].generate(101)
         self.test_spenders(self.nodes[1], spenders_taproot_active(), input_counts=[1, 2, 2, 2, 2, 3])
 
-        # Transfer % of funds to pre-taproot node.
+        # Transfer funds to pre-taproot node.
         addr = self.nodes[0].getnewaddress()
-        self.nodes[1].sendtoaddress(address=addr, amount=int(self.nodes[1].getbalance() * 70000000) / 100000000)
-        self.nodes[1].generate(1)
+        rawtx = self.nodes[1].createrawtransaction(
+            inputs=[{
+                'txid': i['txid'],
+                'vout': i['vout']
+            } for i in self.nodes[1].listunspent()],
+            outputs={addr: self.nodes[1].getbalance()},
+        )
+        rawtx = self.nodes[1].signrawtransactionwithwallet(rawtx)['hex']
+        # Transaction is too large to fit into the mempool, so put it into a block
+        block = create_block(tmpl=self.nodes[1].getblocktemplate(NORMAL_GBT_REQUEST_PARAMS), txlist=[rawtx])
+        add_witness_commitment(block)
+        block.rehash()
+        block.solve()
+        assert_equal(None, self.nodes[1].submitblock(block.serialize().hex()))
         self.sync_blocks()
 
         # Pre-taproot activation tests.
diff --git a/test/functional/test_framework/blocktools.py b/test/functional/test_framework/blocktools.py
index 64bc7e0485..6b7214f03a 100644
--- a/test/functional/test_framework/blocktools.py
+++ b/test/functional/test_framework/blocktools.py
@@ -5,7 +5,6 @@
 """Utilities for manipulating blocks and transactions."""
 
 from binascii import a2b_hex
-import io
 import struct
 import time
 import unittest
@@ -45,7 +44,6 @@ from .script import (
     hash160,
 )
 from .util import assert_equal
-from io import BytesIO
 
 WITNESS_SCALE_FACTOR = 4
 MAX_BLOCK_SIGOPS = 20000
@@ -78,9 +76,7 @@ def create_block(hashprev=None, coinbase=None, ntime=None, *, version=None, tmpl
     if txlist:
         for tx in txlist:
             if not hasattr(tx, 'calc_sha256'):
-                txo = CTransaction()
-                txo.deserialize(io.BytesIO(tx))
-                tx = txo
+                tx = FromHex(CTransaction(), tx)
             block.vtx.append(tx)
     block.hashMerkleRoot = block.calc_merkle_root()
     block.calc_sha256()
@@ -166,8 +162,7 @@ def create_transaction(node, txid, to_address, *, amount):
         sign for the output that is being spent.
     """
     raw_tx = create_raw_transaction(node, txid, to_address, amount=amount)
-    tx = CTransaction()
-    tx.deserialize(BytesIO(hex_str_to_bytes(raw_tx)))
+    tx = FromHex(CTransaction(), raw_tx)
     return tx
 
 def create_raw_transaction(node, txid, to_address, *, amount):
diff --git a/test/functional/test_framework/key.py b/test/functional/test_framework/key.py
index abf2507154..f3d13c049b 100644
--- a/test/functional/test_framework/key.py
+++ b/test/functional/test_framework/key.py
@@ -10,7 +10,6 @@ import csv
 import hashlib
 import os
 import random
-import sys
 import unittest
 
 from .util import modinv
@@ -22,6 +21,7 @@ def TaggedHash(tag, data):
     return hashlib.sha256(ss).digest()
 
 def xor_bytes(b0, b1):
+    assert len(b0) == len(b1)
     return bytes(x ^ y for (x, y) in zip(b0, b1))
 
 def jacobi_symbol(n, k):
@@ -523,7 +523,8 @@ class TestFrameworkKey(unittest.TestCase):
     def test_schnorr_testvectors(self):
         """Implement the BIP340 test vectors (read from bip340_test_vectors.csv)."""
         num_tests = 0
-        with open(os.path.join(sys.path[0], 'test_framework', 'bip340_test_vectors.csv'), newline='', encoding='utf8') as csvfile:
+        vectors_file = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'bip340_test_vectors.csv')
+        with open(vectors_file, newline='', encoding='utf8') as csvfile:
             reader = csv.reader(csvfile)
             next(reader)
             for row in reader: