Merge #18545: test: refactor rpc_signrawtransaction and add logging

9cdddae test: add rpc_signrawtransaction logging (Jon Atack)
4d6cde3 test: refactor rpc_signrawtransaction witness script tests (Jon Atack)

Pull request description:

  As a follow-up to #18484, the new tests are good but bury the one non-duplicate line in each test that sets the witness script, and there is no logging in the testfile. This PR makes it easy to see what is unique to each of the new tests and adds logging.

ACKs for top commit:
  theStack:
    ACK bitcoin/bitcoin@9cdddae 🥚 🐰

Tree-SHA512: 7b1ca303326658afb90b7635abc9fe8bb65f0be004124d4dcf38702bb6f38bc06ce33c0642be4ad5d511453d003cdefeea691e66e3b963a4feb66f6237a3c241

Author: MarcoFalke

test/functional/rpc_signrawtransaction.py

@@ -27,6 +27,7 @@ def successful_signing_test(self):
 
         1) The transaction has a complete set of signatures
         2) No script verification error occurred"""
+        self.log.info("Test valid raw transaction with one input")
         privKeys = ['cUeKHd5orzT3mz8P9pxyREHfsWtVfgsfDjiZZBcjUBAaGk1BTj7N', 'cVKpPfVKSJxKqVpE9awvXNWuLHCa5j5tiE7K6zbUSptFpTEtiFrA']
 
         inputs = [
@@ -49,7 +50,7 @@ def successful_signing_test(self):
         assert 'errors' not in rawTxSigned
 
     def test_with_lock_outputs(self):
-        """Test correct error reporting when trying to sign a locked output"""
+        self.log.info("Test correct error reporting when trying to sign a locked output")
         self.nodes[0].encryptwallet("password")
 
         rawTx = '020000000156b958f78e3f24e0b2f4e4db1255426b0902027cb37e3ddadb52e37c3557dddb0000000000ffffffff01c0a6b929010000001600149a2ee8c77140a053f36018ac8124a6ececc1668a00000000'
@@ -65,6 +66,7 @@ def script_verification_error_test(self):
         4) Two script verification errors occurred
         5) Script verification errors have certain properties ("txid", "vout", "scriptSig", "sequence", "error")
         6) The verification errors refer to the invalid (vin 1) and missing input (vin 2)"""
+        self.log.info("Test script verification errors")
         privKeys = ['cUeKHd5orzT3mz8P9pxyREHfsWtVfgsfDjiZZBcjUBAaGk1BTj7N']
 
         inputs = [
@@ -147,7 +149,7 @@ def script_verification_error_test(self):
         assert not rawTxSigned['errors'][0]['witness']
 
     def witness_script_test(self):
-        # Now test signing transaction to P2SH-P2WSH addresses without wallet
+        self.log.info("Test signing transaction to P2SH-P2WSH addresses without wallet")
         # Create a new P2SH-P2WSH 1-of-1 multisig address:
         embedded_address = self.nodes[1].getaddressinfo(self.nodes[1].getnewaddress())
         embedded_privkey = self.nodes[1].dumpprivkey(embedded_address["address"])
@@ -169,29 +171,18 @@ def witness_script_test(self):
         assert 'complete' in spending_tx_signed
         assert_equal(spending_tx_signed['complete'], True)
 
-        self.log.info('Try with a P2PKH script as the witnessScript')
-        embedded_addr_info = self.nodes[1].getaddressinfo(self.nodes[1].getnewaddress('', 'legacy'))
-        embedded_privkey = self.nodes[1].dumpprivkey(embedded_addr_info['address'])
-        witness_script = embedded_addr_info['scriptPubKey']
-        redeem_script = CScript([OP_0, sha256(check_script(witness_script))]).hex()
-        addr = script_to_p2sh(redeem_script)
-        script_pub_key = self.nodes[1].validateaddress(addr)['scriptPubKey']
-        # Fund that address
-        txid = self.nodes[0].sendtoaddress(addr, 10)
-        vout = find_vout_for_address(self.nodes[0], txid, addr)
-        self.nodes[0].generate(1)
-        # Now create and sign a transaction spending that output on node[0], which doesn't know the scripts or keys
-        spending_tx = self.nodes[0].createrawtransaction([{'txid': txid, 'vout': vout}], {self.nodes[1].getnewaddress(): Decimal("9.999")})
-        spending_tx_signed = self.nodes[0].signrawtransactionwithkey(spending_tx, [embedded_privkey], [{'txid': txid, 'vout': vout, 'scriptPubKey': script_pub_key, 'redeemScript': redeem_script, 'witnessScript': witness_script, 'amount': 10}])
-        # Check the signing completed successfully
-        assert 'complete' in spending_tx_signed
-        assert_equal(spending_tx_signed['complete'], True)
-        self.nodes[0].sendrawtransaction(spending_tx_signed['hex'])
+        # Now test with P2PKH and P2PK scripts as the witnessScript
+        for tx_type in ['P2PKH', 'P2PK']:  # these tests are order-independent
+            self.verify_txn_with_witness_script(tx_type)
 
-        self.log.info('Try with a P2PK script as the witnessScript')
+    def verify_txn_with_witness_script(self, tx_type):
+        self.log.info("Test with a {} script as the witnessScript".format(tx_type))
         embedded_addr_info = self.nodes[1].getaddressinfo(self.nodes[1].getnewaddress('', 'legacy'))
         embedded_privkey = self.nodes[1].dumpprivkey(embedded_addr_info['address'])
-        witness_script = CScript([hex_str_to_bytes(embedded_addr_info['pubkey']), OP_CHECKSIG]).hex()
+        witness_script = {
+            'P2PKH': embedded_addr_info['scriptPubKey'],
+            'P2PK': CScript([hex_str_to_bytes(embedded_addr_info['pubkey']), OP_CHECKSIG]).hex()
+        }.get(tx_type, "Invalid tx_type")
         redeem_script = CScript([OP_0, sha256(check_script(witness_script))]).hex()
         addr = script_to_p2sh(redeem_script)
         script_pub_key = self.nodes[1].validateaddress(addr)['scriptPubKey']