eth-address-index

signed metadata declarations for ethereum addresses
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declarator.py (2069B)

      1 # Author:	Louis Holbrook <dev@holbrook.no> 0826EDA1702D1E87C6E2875121D2E7BB88C2A746
      2 # SPDX-License-Identifier:	GPL-3.0-or-later
      3 # File-version: 1
      4 # Description: Python interface to abi and bin files for faucet contracts
      5 
      6 # standard imports
      7 import logging
      8 import json
      9 import os
     10 import hashlib
     11 
     12 # external imports
     13 from hexathon import (
     14         strip_0x,
     15         add_0x,
     16         )
     17 from chainlib.eth.tx import (
     18         TxFormat,
     19         TxFactory,
     20         )
     21 from chainlib.eth.contract import (
     22         ABIContractEncoder,
     23         ABIContractType,
     24         abi_decode_single,
     25         )
     26 from chainlib.eth.constant import ZERO_ADDRESS
     27 
     28 # local imports
     29 from eth_address_declarator import Declarator
     30 
     31 logg = logging.getLogger(__name__)
     32 
     33 moddir = os.path.dirname(__file__)
     34 datadir = os.path.join(moddir, 'data')
     35 
     36 
     37 def to_declarator_key(declarator_address_hex, declaration_address_hex):
     38     h = hashlib.new('sha256')
     39     h.update(bytes.fromhex(strip_0x(declaration_address_hex)))
     40     h.update(bytes.fromhex(strip_0x(declarator_address_hex)))
     41     return h.digest()
     42 
     43 
     44 class AddressDeclarator(Declarator):
     45 
     46     __abi = None
     47     __bytecode = None
     48 
     49     @staticmethod
     50     def abi():
     51         if AddressDeclarator.__abi == None:
     52             f = open(os.path.join(datadir, 'AddressDeclarator.json'), 'r')
     53             AddressDeclarator.__abi = json.load(f)
     54             f.close()
     55         return AddressDeclarator.__abi
     56 
     57 
     58     @staticmethod
     59     def bytecode():
     60         if AddressDeclarator.__bytecode == None:
     61             f = open(os.path.join(datadir, 'AddressDeclarator.bin'))
     62             AddressDeclarator.__bytecode = f.read()
     63             f.close()
     64         return AddressDeclarator.__bytecode
     65 
     66 
     67     @staticmethod
     68     def gas(code=None):
     69         return 2000000
     70 
     71 
     72     def constructor(self, sender_address, description):
     73         code = AddressDeclarator.bytecode()
     74         enc = ABIContractEncoder()
     75         enc.bytes32(description)
     76         code += enc.get()
     77         tx = self.template(sender_address, None, use_nonce=True)
     78         tx = self.set_code(tx, code)
     79         return self.build(tx)