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https://github.com/alexgo-io/stacks-puppet-node.git
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191 lines
6.0 KiB
Python
191 lines
6.0 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Blockstack-client
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~~~~~
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copyright: (c) 2014-2015 by Halfmoon Labs, Inc.
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copyright: (c) 2016 by Blockstack.org
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This file is part of Blockstack-client.
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Blockstack-client is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Blockstack-client is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Blockstack-client. If not, see <http://www.gnu.org/licenses/>.
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"""
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import pybitcoin
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from pybitcoin import embed_data_in_blockchain, make_op_return_tx, BlockchainInfoClient, \
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hex_hash160, broadcast_transaction, serialize_transaction, \
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make_op_return_outputs, make_op_return_script, make_pay_to_address_script
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from pybitcoin.transactions.outputs import calculate_change_amount
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from utilitybelt import is_hex
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from binascii import hexlify, unhexlify
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from ..b40 import b40_to_hex, bin_to_b40, is_b40
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from ..config import *
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from ..scripts import *
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import virtualchain
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log = virtualchain.get_logger("blockstack-server")
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def update_sanity_test( name, consensus_hash, data_hash ):
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"""
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Verify the validity of an update's data
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Return True if valid
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Raise exception if not
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"""
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if name is not None and (not is_b40( name ) or "+" in name or name.count(".") > 1):
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raise Exception("Name '%s' has non-base-38 characters" % name)
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if data_hash is not None and not is_hex( data_hash ):
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raise Exception("Invalid hex string '%s': not hex" % (data_hash))
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if len(data_hash) != 2 * LENGTH_VALUE_HASH:
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raise Exception("Invalid hex string '%s': bad length" % (data_hash))
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return True
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def build(name, consensus_hash, data_hash=None):
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"""
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Takes in the name to update the data for and the data update itself.
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Name must include the namespace ID, but not the scheme.
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Record format:
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0 2 3 19 39
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|-----|--|-----------------------------------|-----------------------|
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magic op hash128(name.ns_id,consensus hash) hash160(data)
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"""
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rc = update_sanity_test( name, consensus_hash, data_hash )
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if not rc:
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raise Exception("Invalid update data")
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hex_name = hash256_trunc128( name + consensus_hash )
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readable_script = 'NAME_UPDATE 0x%s 0x%s' % (hex_name, data_hash)
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hex_script = blockstack_script_to_hex(readable_script)
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packaged_script = add_magic_bytes(hex_script)
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return packaged_script
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def make_outputs( data, inputs, change_address, tx_fee, pay_fee=True ):
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"""
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Make outputs for an update.
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Raise ValueError if there are not enough inputs to make the transaction
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"""
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dust_fee = None
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op_fee = None
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dust_value = None
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if pay_fee:
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dust_fee = (len(inputs) + 1) * DEFAULT_DUST_FEE + DEFAULT_OP_RETURN_FEE + tx_fee
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op_fee = DEFAULT_DUST_FEE
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dust_value = DEFAULT_DUST_FEE
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else:
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# will be subsidized
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dust_fee = 0
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op_fee = 0
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dust_value = 0
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return [
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# main output
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{"script_hex": make_op_return_script(str(data), format='hex'),
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"value": 0},
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# change output
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{"script_hex": virtualchain.make_payment_script(change_address),
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"value": calculate_change_amount(inputs, op_fee, dust_fee)}
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]
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def make_transaction(name, data_hash, consensus_hash, owner_addr, blockchain_client, tx_fee=0, subsidize=False, safety=True):
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"""
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Write a name update into the blockchain.
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Returns a JSON object with 'data' set to the nulldata and 'transaction_hash' set to the transaction hash on success.
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"""
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name = str(name)
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data_hash = str(data_hash)
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consensus_hash = str(consensus_hash)
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owner_addr = str(owner_addr)
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tx_fee = int(tx_fee)
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assert len(consensus_hash) == LENGTH_CONSENSUS_HASH * 2
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assert is_name_valid(name)
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# sanity check
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pay_fee = True
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if subsidize:
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pay_fee = False
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inputs = tx_get_unspents( owner_addr, blockchain_client )
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if safety:
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assert len(inputs) > 0, "No UTXOs for {}".format(owner_addr)
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nulldata = build(name, consensus_hash, data_hash=data_hash)
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outputs = make_outputs( nulldata, inputs, owner_addr, tx_fee, pay_fee=pay_fee )
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return (inputs, outputs)
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def get_fees( inputs, outputs ):
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"""
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Given a transaction's outputs, look up its fees:
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* there should be two outputs: the OP_RETURN and change address
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Return (dust fees, operation fees) on success
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Return (None, None) on invalid output listing
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"""
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if len(outputs) != 2:
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log.debug("Got %s outputs, not 2" % len(outputs))
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return (None, None)
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# 0: op_return
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if not tx_output_is_op_return( outputs[0] ):
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log.debug("Not an OP_RETURN output: %s" % outputs[0])
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return (None, None)
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if outputs[0]["value"] != 0:
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log.debug("Outputs[0] has non-zero value")
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return (None, None)
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# 1: change address
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if virtualchain.script_hex_to_address( outputs[1]["script_hex"] ) is None:
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return (None, None)
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dust_fee = (len(inputs) + 1) * DEFAULT_DUST_FEE + DEFAULT_OP_RETURN_FEE
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op_fee = 0
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return (dust_fee, op_fee)
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def snv_consensus_extras( name_rec, block_id, blockchain_name_data ):
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"""
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Given a name record most recently affected by an instance of this operation,
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find the dict of consensus-affecting fields from the operation that are not
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already present in the name record.
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"""
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ret_op = {}
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# reconstruct name_hash
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ret_op['name_consensus_hash'] = hash256_trunc128( str(name_rec['name']) + str(name_rec['consensus_hash']) )
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return ret_op
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