test: add logging to rpc_decodescript.py

Also remove the enumerations ("1)", "2)"...) from the test
cases as those potentially hinder maintainability; e.g. if a
new case in inserted in-between, all the remaining
enumerations would need to be adapted.

Author: theStack

test/functional/rpc_decodescript.py

@@ -27,29 +27,29 @@ def decodescript_script_sig(self):
 
         # below are test cases for all of the standard transaction types
 
-        # 1) P2PK scriptSig
+        self.log.info("- P2PK")
         # the scriptSig of a public key scriptPubKey simply pushes a signature onto the stack
         rpc_result = self.nodes[0].decodescript(push_signature)
         assert_equal(signature, rpc_result['asm'])
 
-        # 2) P2PKH scriptSig
+        self.log.info("- P2PKH")
         rpc_result = self.nodes[0].decodescript(push_signature + push_public_key)
         assert_equal(signature + ' ' + public_key, rpc_result['asm'])
 
-        # 3) multisig scriptSig
+        self.log.info("- multisig")
         # this also tests the leading portion of a P2SH multisig scriptSig
         # OP_0 <A sig> <B sig>
         rpc_result = self.nodes[0].decodescript('00' + push_signature + push_signature)
         assert_equal('0 ' + signature + ' ' + signature, rpc_result['asm'])
 
-        # 4) P2SH scriptSig
+        self.log.info("- P2SH")
         # an empty P2SH redeemScript is valid and makes for a very simple test case.
         # thus, such a spending scriptSig would just need to pass the outer redeemScript
         # hash test and leave true on the top of the stack.
         rpc_result = self.nodes[0].decodescript('5100')
         assert_equal('1 0', rpc_result['asm'])
 
-        # 5) null data scriptSig - no such thing because null data scripts can not be spent.
+        # null data scriptSig - no such thing because null data scripts can not be spent.
         # thus, no test case for that standard transaction type is here.
 
     def decodescript_script_pub_key(self):
@@ -63,21 +63,21 @@ def decodescript_script_pub_key(self):
 
         # below are test cases for all of the standard transaction types
 
-        # 1) P2PK scriptPubKey
+        self.log.info("- P2PK")
         # <pubkey> OP_CHECKSIG
         rpc_result = self.nodes[0].decodescript(push_public_key + 'ac')
         assert_equal(public_key + ' OP_CHECKSIG', rpc_result['asm'])
         # P2PK is translated to P2WPKH
         assert_equal('0 ' + public_key_hash, rpc_result['segwit']['asm'])
 
-        # 2) P2PKH scriptPubKey
+        self.log.info("- P2PKH")
         # OP_DUP OP_HASH160 <PubKeyHash> OP_EQUALVERIFY OP_CHECKSIG
         rpc_result = self.nodes[0].decodescript('76a9' + push_public_key_hash + '88ac')
         assert_equal('OP_DUP OP_HASH160 ' + public_key_hash + ' OP_EQUALVERIFY OP_CHECKSIG', rpc_result['asm'])
         # P2PKH is translated to P2WPKH
         assert_equal('0 ' + public_key_hash, rpc_result['segwit']['asm'])
 
-        # 3) multisig scriptPubKey
+        self.log.info("- multisig")
         # <m> <A pubkey> <B pubkey> <C pubkey> <n> OP_CHECKMULTISIG
         # just imagine that the pub keys used below are different.
         # for our purposes here it does not matter that they are the same even though it is unrealistic.
@@ -88,7 +88,7 @@ def decodescript_script_pub_key(self):
         multisig_script_hash = sha256(bytes.fromhex(multisig_script)).hex()
         assert_equal('0 ' + multisig_script_hash, rpc_result['segwit']['asm'])
 
-        # 4) P2SH scriptPubKey
+        self.log.info ("- P2SH")
         # OP_HASH160 <Hash160(redeemScript)> OP_EQUAL.
         # push_public_key_hash here should actually be the hash of a redeem script.
         # but this works the same for purposes of this test.
@@ -97,7 +97,7 @@ def decodescript_script_pub_key(self):
         # P2SH does not work in segwit secripts. decodescript should not return a result for it.
         assert 'segwit' not in rpc_result
 
-        # 5) null data scriptPubKey
+        self.log.info("- null data")
         # use a signature look-alike here to make sure that we do not decode random data as a signature.
         # this matters if/when signature sighash decoding comes along.
         # would want to make sure that no such decoding takes place in this case.
@@ -106,7 +106,8 @@ def decodescript_script_pub_key(self):
         rpc_result = self.nodes[0].decodescript('6a' + signature_imposter)
         assert_equal('OP_RETURN ' + signature_imposter[2:], rpc_result['asm'])
 
-        # 6) a CLTV redeem script. redeem scripts are in-effect scriptPubKey scripts, so adding a test here.
+        self.log.info("- CLTV redeem script")
+        # redeem scripts are in-effect scriptPubKey scripts, so adding a test here.
         # OP_NOP2 is also known as OP_CHECKLOCKTIMEVERIFY.
         # just imagine that the pub keys used below are different.
         # for our purposes here it does not matter that they are the same even though it is unrealistic.
@@ -126,15 +127,15 @@ def decodescript_script_pub_key(self):
         cltv_script_hash = sha256(bytes.fromhex(cltv_script)).hex()
         assert_equal('0 ' + cltv_script_hash, rpc_result['segwit']['asm'])
 
-        # 7) P2PK scriptPubKey
+        self.log.info("- P2PK with uncompressed pubkey")
         # <pubkey> OP_CHECKSIG
         rpc_result = self.nodes[0].decodescript(push_uncompressed_public_key + 'ac')
         assert_equal(uncompressed_public_key + ' OP_CHECKSIG', rpc_result['asm'])
         # uncompressed pubkeys are invalid for checksigs in segwit scripts.
         # decodescript should not return a P2WPKH equivalent.
         assert 'segwit' not in rpc_result
 
-        # 8) multisig scriptPubKey with an uncompressed pubkey
+        self.log.info("- multisig with uncompressed pubkey")
         # <m> <A pubkey> <B pubkey> <n> OP_CHECKMULTISIG
         # just imagine that the pub keys used below are different.
         # the purpose of this test is to check that a segwit script is not returned for bare multisig scripts
@@ -145,15 +146,15 @@ def decodescript_script_pub_key(self):
         # decodescript should not return a P2WPKH equivalent.
         assert 'segwit' not in rpc_result
 
-        # 9) P2WPKH scriptpubkey
+        self.log.info("- P2WPKH")
         # 0 <PubKeyHash>
         rpc_result = self.nodes[0].decodescript('00' + push_public_key_hash)
         assert_equal('0 ' + public_key_hash, rpc_result['asm'])
         # segwit scripts do not work nested into each other.
         # a nested segwit script should not be returned in the results.
         assert 'segwit' not in rpc_result
 
-        # 10) P2WSH scriptpubkey
+        self.log.info("- P2WSH")
         # 0 <ScriptHash>
         # even though this hash is of a P2PK script which is better used as bare P2WPKH, it should not matter
         # for the purpose of this test.
@@ -169,7 +170,8 @@ def decoderawtransaction_asm_sighashtype(self):
         This test is in with the "decodescript" tests because they are testing the same "asm" script decodes.
         """
 
-        # this test case uses a random plain vanilla mainnet transaction with a single P2PKH input and output
+        self.log.info("- various mainnet txs")
+        # this test case uses a mainnet transaction that has a P2SH input and both P2PKH and P2SH outputs.
         tx = '0100000001696a20784a2c70143f634e95227dbdfdf0ecd51647052e70854512235f5986ca010000008a47304402207174775824bec6c2700023309a168231ec80b82c6069282f5133e6f11cbb04460220570edc55c7c5da2ca687ebd0372d3546ebc3f810516a002350cac72dfe192dfb014104d3f898e6487787910a690410b7a917ef198905c27fb9d3b0a42da12aceae0544fc7088d239d9a48f2828a15a09e84043001f27cc80d162cb95404e1210161536ffffffff0100e1f505000000001976a914eb6c6e0cdb2d256a32d97b8df1fc75d1920d9bca88ac00000000'
         rpc_result = self.nodes[0].decoderawtransaction(tx)
         assert_equal('304402207174775824bec6c2700023309a168231ec80b82c6069282f5133e6f11cbb04460220570edc55c7c5da2ca687ebd0372d3546ebc3f810516a002350cac72dfe192dfb[ALL] 04d3f898e6487787910a690410b7a917ef198905c27fb9d3b0a42da12aceae0544fc7088d239d9a48f2828a15a09e84043001f27cc80d162cb95404e1210161536', rpc_result['vin'][0]['scriptSig']['asm'])
@@ -185,11 +187,13 @@ def decoderawtransaction_asm_sighashtype(self):
         assert_equal('OP_HASH160 2a5edea39971049a540474c6a99edf0aa4074c58 OP_EQUAL', rpc_result['vout'][1]['scriptPubKey']['asm'])
         txSave = tx_from_hex(tx)
 
+        self.log.info("- tx not passing DER signature checks")
         # make sure that a specifically crafted op_return value will not pass all the IsDERSignature checks and then get decoded as a sighash type
         tx = '01000000015ded05872fdbda629c7d3d02b194763ce3b9b1535ea884e3c8e765d42e316724020000006b48304502204c10d4064885c42638cbff3585915b322de33762598321145ba033fc796971e2022100bb153ad3baa8b757e30a2175bd32852d2e1cb9080f84d7e32fcdfd667934ef1b012103163c0ff73511ea1743fb5b98384a2ff09dd06949488028fd819f4d83f56264efffffffff0200000000000000000b6a0930060201000201000180380100000000001976a9141cabd296e753837c086da7a45a6c2fe0d49d7b7b88ac00000000'
         rpc_result = self.nodes[0].decoderawtransaction(tx)
         assert_equal('OP_RETURN 300602010002010001', rpc_result['vout'][0]['scriptPubKey']['asm'])
 
+        self.log.info("- tx passing DER signature checks")
         # verify that we have not altered scriptPubKey processing even of a specially crafted P2PKH pubkeyhash and P2SH redeem script hash that is made to pass the der signature checks
         tx = '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'
         rpc_result = self.nodes[0].decoderawtransaction(tx)
@@ -207,7 +211,7 @@ def decoderawtransaction_asm_sighashtype(self):
         push_signature_2 = '48' + signature_2
         signature_2_sighash_decoded = der_signature + '[NONE|ANYONECANPAY]'
 
-        # 1) P2PK scriptSig
+        self.log.info("- P2PK scriptSig")
         txSave.vin[0].scriptSig = bytes.fromhex(push_signature)
         rpc_result = self.nodes[0].decoderawtransaction(txSave.serialize().hex())
         assert_equal(signature_sighash_decoded, rpc_result['vin'][0]['scriptSig']['asm'])
@@ -217,20 +221,23 @@ def decoderawtransaction_asm_sighashtype(self):
         rpc_result = self.nodes[0].decoderawtransaction(txSave.serialize().hex())
         assert_equal(signature_2_sighash_decoded, rpc_result['vin'][0]['scriptSig']['asm'])
 
-        # 2) multisig scriptSig
+        self.log.info("- multisig scriptSig")
         txSave.vin[0].scriptSig = bytes.fromhex('00' + push_signature + push_signature_2)
         rpc_result = self.nodes[0].decoderawtransaction(txSave.serialize().hex())
         assert_equal('0 ' + signature_sighash_decoded + ' ' + signature_2_sighash_decoded, rpc_result['vin'][0]['scriptSig']['asm'])
 
-        # 3) test a scriptSig that contains more than push operations.
+        self.log.info("- scriptSig that contains more than push operations")
         # in fact, it contains an OP_RETURN with data specially crafted to cause improper decode if the code does not catch it.
         txSave.vin[0].scriptSig = bytes.fromhex('6a143011020701010101010101020601010101010101')
         rpc_result = self.nodes[0].decoderawtransaction(txSave.serialize().hex())
         assert_equal('OP_RETURN 3011020701010101010101020601010101010101', rpc_result['vin'][0]['scriptSig']['asm'])
 
     def run_test(self):
+        self.log.info("Test decoding of standard input scripts [scriptSig]")
         self.decodescript_script_sig()
+        self.log.info("Test decoding of standard output scripts [scriptPubKey]")
         self.decodescript_script_pub_key()
+        self.log.info("Test 'asm' script decoding of transactions")
         self.decoderawtransaction_asm_sighashtype()
 
 if __name__ == '__main__':