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https://github.com/alexgo-io/stacks-puppet-node.git
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151 lines
4.2 KiB
Python
151 lines
4.2 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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from binascii import hexlify
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from ..config import *
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from ..scripts import *
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from ..logger import get_logger
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import virtualchain
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log = get_logger("blockstack-client")
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def build(name):
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"""
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Takes in the name, including the namespace ID (but not the id: scheme)
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Returns a hex string representing up to the maximum name length bytes.
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Record format:
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0 2 3 39
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|----|--|-----------------------------|
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magic op name.ns_id (37 bytes)
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"""
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if not is_name_valid( name ):
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raise Exception("Invalid name '%s'" % name)
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readable_script = "NAME_REVOKE 0x%s" % (hexlify(name))
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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 a revoke.
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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": virtualchain.make_data_script(str(data)),
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"value": 0},
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# change output
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{"script": virtualchain.make_payment_script(change_address),
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"value": virtualchain.calculate_change_amount(inputs, op_fee, dust_fee)}
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]
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def make_transaction(name, owner_addr, blockchain_client, tx_fee=0, subsidize=False, safety=True ):
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name = str(name)
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owner_addr = str(owner_addr)
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tx_fee = int(tx_fee)
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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)
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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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return (None, None)
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# 0: op_return
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if not virtualchain.tx_output_has_data( outputs[0] ):
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return (None, None)
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if outputs[0]["value"] != 0:
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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"] ) is None:
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return (None, None)
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# should match make_outputs().
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# the +1 comes from one new output
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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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Calculate any derived missing data that goes into the check() operation,
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given the block number, the name record at the block number, and the db.
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"""
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ret_op = {}
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return ret_op
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