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https://github.com/alexgo-io/stacks-puppet-node.git
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119 lines
3.6 KiB
Python
119 lines
3.6 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, hex_hash160, \
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make_op_return_tx, serialize_transaction, broadcast_transaction, make_op_return_script
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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-client")
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def build( namespace_id):
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"""
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Record to mark the end of a namespace import in the blockchain.
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Takes an base40-encoded namespace ID to mark the end.
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Format:
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0 2 3 4 23
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|-----|--|--|------------|
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magic op . ns_id
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"""
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# sanity check
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if not is_b40( namespace_id ) or "+" in namespace_id or namespace_id.count(".") > 0:
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raise Exception("Namespace ID '%s' has non-base-38 characters" % namespace_id)
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if len(namespace_id) == 0 or len(namespace_id) > LENGTH_MAX_NAMESPACE_ID:
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raise Exception("Invalid namespace ID '%s (expected length between 1 and %s)" % (namespace_id, LENGTH_MAX_NAMESPACE_ID))
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readable_script = "NAMESPACE_READY 0x%s" % (hexlify("." + namespace_id))
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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( nulldata, inputs, change_addr, fee=0, format='bin' ):
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"""
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Make namespace-ready outputs
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"""
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return [
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{ "script_hex": make_op_return_script(nulldata, format=format),
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"value": 0
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},
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# change output
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{ "script_hex": virtualchain.make_payment_script(change_addr),
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"value": calculate_change_amount(inputs, 0, fee)
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}
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]
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def make_transaction( namespace_id, reveal_addr, blockchain_client, tx_fee=0, safety=True ):
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"""
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Make the namespace ready transaction
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Raise ValueError if there are not enough inputs to make the transaction
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"""
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namespace_id = str(namespace_id)
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reveal_addr = str(reveal_addr)
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tx_fee = int(tx_fee)
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assert is_namespace_valid( namespace_id )
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nulldata = build( namespace_id )
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# get inputs and from public key
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inputs = tx_get_unspents( reveal_addr, blockchain_client )
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if safety:
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assert len(inputs) > 0
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# OP_RETURN outputs
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outputs = make_outputs( nulldata, inputs, reveal_addr, fee=(DEFAULT_OP_RETURN_FEE + tx_fee), format='hex' )
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return (inputs, outputs)
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def get_fees( inputs, outputs ):
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"""
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Blockstack currently does not allow
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the subsidization of namespaces.
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"""
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return (None, None)
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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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return {}
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