def _on_data(self):
        """Try to read P2P messages from the recv buffer.

        This method reads data from the buffer in a loop. It deserializes,
        parses and verifies the P2P header, then passes the P2P payload to
        the on_message callback for processing."""
        try:
            while True:
                if len(self.recvbuf) < 4:
                    return
                if self.recvbuf[:4] != self.magic_bytes:
                    raise ValueError("magic bytes mismatch: {} != {}".format(repr(self.magic_bytes), repr(self.recvbuf)))
                if len(self.recvbuf) < 4 + 12 + 4 + 4:
                    return
                command = self.recvbuf[4:4+12].split(b"\x00", 1)[0]
                msglen = struct.unpack("<i", self.recvbuf[4+12:4+12+4])[0]
                checksum = self.recvbuf[4+12+4:4+12+4+4]
                if len(self.recvbuf) < 4 + 12 + 4 + 4 + msglen:
                    return
                msg = self.recvbuf[4+12+4+4:4+12+4+4+msglen]
                th = sha256(msg)
                h = sha256(th)
                if checksum != h[:4]:
                    raise ValueError("got bad checksum " + repr(self.recvbuf))
                self.recvbuf = self.recvbuf[4+12+4+4+msglen:]
                if command not in MESSAGEMAP:
                    raise ValueError("Received unknown command from %s:%d: '%s' %s" % (self.dstaddr, self.dstport, command, repr(msg)))
                f = BytesIO(msg)
                t = MESSAGEMAP[command]()
                t.deserialize(f)
                self._log_message("receive", t)
                self.on_message(t)
        except Exception as e:
            logger.exception('Error reading message:', repr(e))
            raise

 def build_message(self, message):
     """Build a serialized P2P message"""
     command = message.command
     data = message.serialize()
     tmsg = self.magic_bytes
     tmsg += command
     tmsg += b"\x00" * (12 - len(command))
     tmsg += struct.pack("<I", len(data))
     th = sha256(data)
     h = sha256(th)
     tmsg += h[:4]
     tmsg += data
     return tmsg

 def p2pkh_address_to_script(self,v):
     pubkey = hex_str_to_bytes(v['pubkey'])
     p2wpkh = CScript([OP_0, hash160(pubkey)])
     p2sh_p2wpkh = CScript([OP_HASH160, hash160(p2wpkh), OP_EQUAL])
     p2pk = CScript([pubkey, OP_CHECKSIG])
     p2pkh = CScript(hex_str_to_bytes(v['scriptPubKey']))
     p2sh_p2pk = CScript([OP_HASH160, hash160(p2pk), OP_EQUAL])
     p2sh_p2pkh = CScript([OP_HASH160, hash160(p2pkh), OP_EQUAL])
     p2wsh_p2pk = CScript([OP_0, sha256(p2pk)])
     p2wsh_p2pkh = CScript([OP_0, sha256(p2pkh)])
     p2sh_p2wsh_p2pk = CScript([OP_HASH160, hash160(p2wsh_p2pk), OP_EQUAL])
     p2sh_p2wsh_p2pkh = CScript([OP_HASH160, hash160(p2wsh_p2pkh), OP_EQUAL])
     return [p2wpkh, p2sh_p2wpkh, p2pk, p2pkh, p2sh_p2pk, p2sh_p2pkh, p2wsh_p2pk, p2wsh_p2pkh, p2sh_p2wsh_p2pk, p2sh_p2wsh_p2pkh]

 def _build_message(self, message):
     """Build a serialized P2P message"""
     command = message.command
     data = message.serialize()
     tmsg = MAGIC_BYTES[self.network]
     tmsg += command
     tmsg += b"\x00" * (12 - len(command))
     tmsg += struct.pack("<I", len(data))
     th = sha256(data)
     h = sha256(th)
     tmsg += h[:4]
     tmsg += data
     return tmsg

 def witness_script_test(self):
     # Now 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"])
     p2sh_p2wsh_address = self.nodes[1].addmultisigaddress(1, [embedded_address["pubkey"]], "", "p2sh-segwit")
     # send transaction to P2SH-P2WSH 1-of-1 multisig address
     self.nodes[0].generate(101)
     self.nodes[0].sendtoaddress(p2sh_p2wsh_address["address"], 49.999)
     self.nodes[0].generate(1)
     self.sync_all()
     # Find the UTXO for the transaction node[1] should have received, check witnessScript matches
     unspent_output = self.nodes[1].listunspent(0, 999999, [p2sh_p2wsh_address["address"]])[0]
     assert_equal(unspent_output["witnessScript"], p2sh_p2wsh_address["redeemScript"])
     p2sh_redeemScript = CScript([OP_0, sha256(hex_str_to_bytes(p2sh_p2wsh_address["redeemScript"]))])
     assert_equal(unspent_output["redeemScript"], p2sh_redeemScript.hex())
     # 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([unspent_output], {self.nodes[1].getnewaddress(): Decimal("49.998")})
     spending_tx_signed = self.nodes[0].signrawtransactionwithkey(spending_tx, [embedded_privkey], [unspent_output])
     # Check the signing completed successfully
     assert 'complete' in spending_tx_signed
     assert_equal(spending_tx_signed['complete'], True)

#.........这里部分代码省略.........
        assert_equal(address_assert['iswatchonly'], False)
        assert_equal(address_assert['ismine'], True)

        # P2WSH multisig address without scripts or keys
        sig_address_1 = self.nodes[0].getaddressinfo(self.nodes[0].getnewaddress())
        sig_address_2 = self.nodes[0].getaddressinfo(self.nodes[0].getnewaddress())
        multi_sig_script = self.nodes[0].addmultisigaddress(2, [sig_address_1['pubkey'], sig_address_2['pubkey']], "", "bech32")
        self.log.info("Should import a p2wsh multisig as watch only without respective redeem script and private keys")
        result = self.nodes[1].importmulti([{
            "scriptPubKey": {
                "address": multi_sig_script['address']
            },
            "timestamp": "now"
        }])
        assert_equal(result[0]['success'], True)
        address_assert = self.nodes[1].getaddressinfo(multi_sig_script['address'])
        assert_equal(address_assert['solvable'], False)

        # Same P2WSH multisig address as above, but now with witnessscript + private keys
        self.log.info("Should import a p2wsh with respective redeem script and private keys")
        result = self.nodes[1].importmulti([{
            "scriptPubKey": {
                "address": multi_sig_script['address']
            },
            "timestamp": "now",
            "witnessscript": multi_sig_script['redeemScript'],
            "keys": [ self.nodes[0].dumpprivkey(sig_address_1['address']), self.nodes[0].dumpprivkey(sig_address_2['address']) ]
        }])
        assert_equal(result[0]['success'], True)
        address_assert = self.nodes[1].getaddressinfo(multi_sig_script['address'])
        assert_equal(address_assert['solvable'], True)
        assert_equal(address_assert['ismine'], True)
        assert_equal(address_assert['sigsrequired'], 2)

        # P2SH-P2WPKH address with no redeemscript or public or private key
        sig_address_1 = self.nodes[0].getaddressinfo(self.nodes[0].getnewaddress(address_type="p2sh-segwit"))
        pubkeyhash = hash160(hex_str_to_bytes(sig_address_1['pubkey']))
        pkscript = CScript([OP_0, pubkeyhash])
        self.log.info("Should import a p2sh-p2wpkh without redeem script or keys")
        result = self.nodes[1].importmulti([{
            "scriptPubKey": {
                "address": sig_address_1['address']
            },
            "timestamp": "now"
        }])
        assert_equal(result[0]['success'], True)
        address_assert = self.nodes[1].getaddressinfo(sig_address_1['address'])
        assert_equal(address_assert['solvable'], False)
        assert_equal(address_assert['ismine'], False)

        # P2SH-P2WPKH address + redeemscript + public key with no private key
        self.log.info("Should import a p2sh-p2wpkh with respective redeem script and pubkey as solvable")
        result = self.nodes[1].importmulti([{
            "scriptPubKey": {
                "address": sig_address_1['address']
            },
            "timestamp": "now",
            "redeemscript": bytes_to_hex_str(pkscript),
            "pubkeys": [ sig_address_1['pubkey'] ]
        }])
        assert_equal(result[0]['success'], True)
        address_assert = self.nodes[1].getaddressinfo(sig_address_1['address'])
        assert_equal(address_assert['solvable'], True)
        assert_equal(address_assert['ismine'], False)

        # P2SH-P2WPKH address + redeemscript + private key
        sig_address_1 = self.nodes[0].getaddressinfo(self.nodes[0].getnewaddress(address_type="p2sh-segwit"))
        pubkeyhash = hash160(hex_str_to_bytes(sig_address_1['pubkey']))
        pkscript = CScript([OP_0, pubkeyhash])
        self.log.info("Should import a p2sh-p2wpkh with respective redeem script and private keys")
        result = self.nodes[1].importmulti([{
            "scriptPubKey": {
                "address": sig_address_1['address']
            },
            "timestamp": "now",
            "redeemscript": bytes_to_hex_str(pkscript),
            "keys": [ self.nodes[0].dumpprivkey(sig_address_1['address'])]
        }])
        assert_equal(result[0]['success'], True)
        address_assert = self.nodes[1].getaddressinfo(sig_address_1['address'])
        assert_equal(address_assert['solvable'], True)
        assert_equal(address_assert['ismine'], True)

        # P2SH-P2WSH 1-of-1 multisig + redeemscript with no private key
        sig_address_1 = self.nodes[0].getaddressinfo(self.nodes[0].getnewaddress())
        multi_sig_script = self.nodes[0].addmultisigaddress(1, [sig_address_1['pubkey']], "", "p2sh-segwit")
        scripthash = sha256(hex_str_to_bytes(multi_sig_script['redeemScript']))
        redeem_script = CScript([OP_0, scripthash])
        self.log.info("Should import a p2sh-p2wsh with respective redeem script but no private key")
        result = self.nodes[1].importmulti([{
            "scriptPubKey": {
                "address": multi_sig_script['address']
            },
            "timestamp": "now",
            "redeemscript": bytes_to_hex_str(redeem_script),
            "witnessscript": multi_sig_script['redeemScript']
        }])
        assert_equal(result[0]['success'], True)
        address_assert = self.nodes[1].getaddressinfo(multi_sig_script['address'])
        assert_equal(address_assert['solvable'], True)

#.........这里部分代码省略.........
        tmpl = self.nodes[0].getblocktemplate({'rules':['segwit']})
        assert(tmpl['sizelimit'] >= 3999577)  # actual maximum size is lower due to minimum mandatory non-witness data
        assert(tmpl['weightlimit'] == 4000000)
        assert(tmpl['sigoplimit'] == 80000)
        assert(tmpl['transactions'][0]['txid'] == txid)
        assert(tmpl['transactions'][0]['sigops'] == 8)

        self.nodes[0].generate(1) # Mine a block to clear the gbt cache

        self.log.info("Non-segwit miners are able to use GBT response after activation.")
        # Create a 3-tx chain: tx1 (non-segwit input, paying to a segwit output) ->
        #                      tx2 (segwit input, paying to a non-segwit output) ->
        #                      tx3 (non-segwit input, paying to a non-segwit output).
        # tx1 is allowed to appear in the block, but no others.
        txid1 = send_to_witness(1, self.nodes[0], find_spendable_utxo(self.nodes[0], 50), self.pubkey[0], False, Decimal("49.996"))
        hex_tx = self.nodes[0].gettransaction(txid)['hex']
        tx = FromHex(CTransaction(), hex_tx)
        assert(tx.wit.is_null()) # This should not be a segwit input
        assert(txid1 in self.nodes[0].getrawmempool())

        # Now create tx2, which will spend from txid1.
        tx = CTransaction()
        tx.vin.append(CTxIn(COutPoint(int(txid1, 16), 0), b''))
        tx.vout.append(CTxOut(int(49.99 * COIN), CScript([OP_TRUE, OP_DROP] * 15 + [OP_TRUE])))
        tx2_hex = self.nodes[0].signrawtransactionwithwallet(ToHex(tx))['hex']
        txid2 = self.nodes[0].sendrawtransaction(tx2_hex)
        tx = FromHex(CTransaction(), tx2_hex)
        assert(not tx.wit.is_null())

        # Now create tx3, which will spend from txid2
        tx = CTransaction()
        tx.vin.append(CTxIn(COutPoint(int(txid2, 16), 0), b""))
        tx.vout.append(CTxOut(int(49.95 * COIN), CScript([OP_TRUE, OP_DROP] * 15 + [OP_TRUE])))  # Huge fee
        tx.calc_sha256()
        txid3 = self.nodes[0].sendrawtransaction(ToHex(tx))
        assert(tx.wit.is_null())
        assert(txid3 in self.nodes[0].getrawmempool())

        # Now try calling getblocktemplate() without segwit support.
        template = self.nodes[0].getblocktemplate()

        # Check that tx1 is the only transaction of the 3 in the template.
        template_txids = [ t['txid'] for t in template['transactions'] ]
        assert(txid2 not in template_txids and txid3 not in template_txids)
        assert(txid1 in template_txids)

        # Check that running with segwit support results in all 3 being included.
        template = self.nodes[0].getblocktemplate({"rules": ["segwit"]})
        template_txids = [ t['txid'] for t in template['transactions'] ]
        assert(txid1 in template_txids)
        assert(txid2 in template_txids)
        assert(txid3 in template_txids)

        # Check that wtxid is properly reported in mempool entry
        assert_equal(int(self.nodes[0].getmempoolentry(txid3)["wtxid"], 16), tx.calc_sha256(True))

        # Mine a block to clear the gbt cache again.
        self.nodes[0].generate(1)

        self.log.info("Verify behaviour of importaddress, addwitnessaddress and listunspent")

        # Some public keys to be used later
        pubkeys = [
            "0363D44AABD0F1699138239DF2F042C3282C0671CC7A76826A55C8203D90E39242", # cPiM8Ub4heR9NBYmgVzJQiUH1if44GSBGiqaeJySuL2BKxubvgwb
            "02D3E626B3E616FC8662B489C123349FECBFC611E778E5BE739B257EAE4721E5BF", # cPpAdHaD6VoYbW78kveN2bsvb45Q7G5PhaPApVUGwvF8VQ9brD97
            "04A47F2CBCEFFA7B9BCDA184E7D5668D3DA6F9079AD41E422FA5FD7B2D458F2538A62F5BD8EC85C2477F39650BD391EA6250207065B2A81DA8B009FC891E898F0E", # 91zqCU5B9sdWxzMt1ca3VzbtVm2YM6Hi5Rxn4UDtxEaN9C9nzXV

 def p2sh_address_to_script(self,v):
     bare = CScript(hex_str_to_bytes(v['hex']))
     p2sh = CScript(hex_str_to_bytes(v['scriptPubKey']))
     p2wsh = CScript([OP_0, sha256(bare)])
     p2sh_p2wsh = CScript([OP_HASH160, hash160(p2wsh), OP_EQUAL])
     return([bare, p2sh, p2wsh, p2sh_p2wsh])

    def decodescript_script_pub_key(self):
        public_key = '03b0da749730dc9b4b1f4a14d6902877a92541f5368778853d9c4a0cb7802dcfb2'
        push_public_key = '21' + public_key
        public_key_hash = '5dd1d3a048119c27b28293056724d9522f26d945'
        push_public_key_hash = '14' + public_key_hash
        uncompressed_public_key = '04b0da749730dc9b4b1f4a14d6902877a92541f5368778853d9c4a0cb7802dcfb25e01fc8fde47c96c98a4f3a8123e33a38a50cf9025cc8c4494a518f991792bb7'
        push_uncompressed_public_key = '41' + uncompressed_public_key
        p2wsh_p2pk_script_hash = 'd8590cf8ea0674cf3d49fd7ca249b85ef7485dea62c138468bddeb20cd6519f7'

        # below are test cases for all of the standard transaction types

        # 1) P2PK scriptPubKey
        # <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
        # 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
        # <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.
        multisig_script = '52' + push_public_key + push_public_key + push_public_key + '53ae'
        rpc_result = self.nodes[0].decodescript(multisig_script)
        assert_equal('2 ' + public_key + ' ' + public_key + ' ' + public_key +  ' 3 OP_CHECKMULTISIG', rpc_result['asm'])
        # multisig in P2WSH
        multisig_script_hash = sha256(hex_str_to_bytes(multisig_script)).hex()
        assert_equal('0 ' + multisig_script_hash, rpc_result['segwit']['asm'])

        # 4) P2SH scriptPubKey
        # 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.
        rpc_result = self.nodes[0].decodescript('a9' + push_public_key_hash + '87')
        assert_equal('OP_HASH160 ' + public_key_hash + ' OP_EQUAL', rpc_result['asm'])
        # 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
        # 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.
        signature_imposter = '48304502207fa7a6d1e0ee81132a269ad84e68d695483745cde8b541e3bf630749894e342a022100c1f7ab20e13e22fb95281a870f3dcf38d782e53023ee313d741ad0cfbc0c509001'
        # OP_RETURN <data>
        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.
        # 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.
        #
        # OP_IF
        #   <receiver-pubkey> OP_CHECKSIGVERIFY
        # OP_ELSE
        #   <lock-until> OP_CHECKLOCKTIMEVERIFY OP_DROP
        # OP_ENDIF
        # <sender-pubkey> OP_CHECKSIG
        #
        # lock until block 500,000
        cltv_script = '63' + push_public_key + 'ad670320a107b17568' + push_public_key + 'ac'
        rpc_result = self.nodes[0].decodescript(cltv_script)
        assert_equal('OP_IF ' + public_key + ' OP_CHECKSIGVERIFY OP_ELSE 500000 OP_CHECKLOCKTIMEVERIFY OP_DROP OP_ENDIF ' + public_key + ' OP_CHECKSIG', rpc_result['asm'])
        # CLTV script in P2WSH
        cltv_script_hash = sha256(hex_str_to_bytes(cltv_script)).hex()
        assert_equal('0 ' + cltv_script_hash, rpc_result['segwit']['asm'])

        # 7) P2PK scriptPubKey
        # <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
        # <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
        # with an uncompressed pubkey in them.
        rpc_result = self.nodes[0].decodescript('52' + push_public_key + push_uncompressed_public_key +'52ae')
        assert_equal('2 ' + public_key + ' ' + uncompressed_public_key + ' 2 OP_CHECKMULTISIG', 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

        # 9) P2WPKH scriptpubkey
        # 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
#.........这里部分代码省略.........