erc20-vend

Create ERC20 tokens the can be minted by existing ERC20 token balance
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vend.py (5114B)

      1 # standard imports
      2 import logging
      3 import os
      4 import enum
      5 
      6 # external imports
      7 from chainlib.eth.constant import ZERO_ADDRESS
      8 from chainlib.eth.contract import (
      9     ABIContractEncoder,
     10     ABIContractDecoder,
     11     ABIContractType,
     12     abi_decode_single,
     13 )
     14 from chainlib.eth.jsonrpc import to_blockheight_param
     15 from chainlib.eth.error import RequestMismatchException
     16 from chainlib.eth.tx import (
     17     TxFactory,
     18     TxFormat,
     19 )
     20 from chainlib.jsonrpc import JSONRPCRequest
     21 from chainlib.block import BlockSpec
     22 from hexathon import (
     23     add_0x,
     24     strip_0x,
     25 )
     26 from chainlib.eth.cli.encode import CLIEncoder
     27 
     28 # local imports
     29 from erc20_vend.data import data_dir
     30 
     31 logg = logging.getLogger()
     32 
     33 
     34 
     35 class Vend(TxFactory):
     36 
     37     __abi = None
     38     __bytecode = None
     39 
     40     def constructor(self, sender_address, token_address, decimals=0, mint=False, tx_format=TxFormat.JSONRPC, version=None):
     41         code = self.cargs(token_address, decimals=decimals, mint=mint, version=version)
     42         tx = self.template(sender_address, None, use_nonce=True)
     43         tx = self.set_code(tx, code)
     44         return self.finalize(tx, tx_format)
     45 
     46 
     47     @staticmethod
     48     def cargs(token_address, decimals=0, mint=False, version=None):
     49         code = Vend.bytecode(version=version)
     50         enc = ABIContractEncoder()
     51         enc.address(token_address)
     52         enc.uintn(decimals, 8)
     53         enc.bool(mint)
     54         args = enc.get()
     55         code += args
     56         logg.debug('constructor code: ' + args)
     57         return code
     58 
     59 
     60     @staticmethod
     61     def gas(code=None):
     62         return 4000000
     63 
     64 
     65 
     66     @staticmethod
     67     def abi():
     68         if Vend.__abi == None:
     69             f = open(os.path.join(data_dir, 'Vend.json'), 'r')
     70             Vend.__abi = json.load(f)
     71             f.close()
     72         return Vend.__abi
     73 
     74 
     75     @staticmethod
     76     def bytecode(version=None):
     77         if Vend.__bytecode == None:
     78             f = open(os.path.join(data_dir, 'Vend.bin'))
     79             Vend.__bytecode = f.read()
     80             f.close()
     81         return Vend.__bytecode
     82 
     83     
     84     def create(self, contract_address, sender_address, name, symbol, tx_format=TxFormat.JSONRPC, id_generator=None):
     85         enc = ABIContractEncoder()
     86         enc.method('create')
     87         enc.typ(ABIContractType.STRING)
     88         enc.typ(ABIContractType.STRING)
     89         enc.string(name)
     90         enc.string(symbol)
     91         data = add_0x(enc.get())
     92         tx = self.template(sender_address, contract_address, use_nonce=True)
     93         tx = self.set_code(tx, data)
     94         tx = self.finalize(tx, tx_format, id_generator=id_generator)
     95         return tx
     96 
     97 
     98     def deposit(self, contract_address, sender_address, token_address, tx_format=TxFormat.JSONRPC, id_generator=None):
     99         enc = ABIContractEncoder()
    100         enc.method('deposit')
    101         enc.typ(ABIContractType.ADDRESS)
    102         enc.typ(ABIContractType.UINT256)
    103         enc.address(token_address)
    104         enc.uint256(0)
    105         data = add_0x(enc.get())
    106         tx = self.template(sender_address, contract_address, use_nonce=True)
    107         tx = self.set_code(tx, data)
    108         tx = self.finalize(tx, tx_format, id_generator=id_generator)
    109         return tx
    110 
    111 
    112     def withdraw(self, contract_address, sender_address, token_address, tx_format=TxFormat.JSONRPC, id_generator=None):
    113         enc = ABIContractEncoder()
    114         enc.method('withdraw')
    115         enc.typ(ABIContractType.ADDRESS)
    116         enc.typ(ABIContractType.UINT256)
    117         enc.address(token_address)
    118         enc.uint256(0)
    119         data = add_0x(enc.get())
    120         tx = self.template(sender_address, contract_address, use_nonce=True)
    121         tx = self.set_code(tx, data)
    122         tx = self.finalize(tx, tx_format, id_generator=id_generator)
    123         return tx
    124 
    125 
    126     def get_token(self, contract_address, token_idx, sender_address=ZERO_ADDRESS, id_generator=None):
    127         j = JSONRPCRequest(id_generator)
    128         o = j.template()
    129         o['method'] = 'eth_call'
    130         enc = ABIContractEncoder()
    131         enc.method('getTokenByIndex')
    132         enc.typ(ABIContractType.UINT256)
    133         enc.uint256(token_idx)
    134         data = add_0x(enc.get())
    135         tx = self.template(sender_address, contract_address)
    136         tx = self.set_code(tx, data)
    137         o['params'].append(self.normalize(tx))
    138         o['params'].append('latest')
    139         o = j.finalize(o)
    140         return o
    141 
    142 
    143     def parse_token(self, v):
    144         dec = ABIContractDecoder()
    145         dec.typ(ABIContractType.ADDRESS)
    146         dec.val(v)
    147         r = dec.get()
    148         return r[0]
    149 
    150 
    151 def bytecode(**kwargs):
    152     return Vend.bytecode(version=kwargs.get('version'))
    153 
    154 
    155 def create(**kwargs):
    156     enc = CLIEncoder()
    157     (typ, token_address) = enc.translate('a', strip_0x(kwargs['token_address']))
    158     decimals = kwargs.get('decimals', 0)
    159     if decimals != None:
    160         (typ, decimals) = enc.translate('u', decimals)
    161     return Vend.cargs(token_address, decimals=decimals, mint=kwargs.get('mint'), version=kwargs.get('version'))
    162 
    163 
    164 def args(v):
    165     if v == 'create':
    166         return (['token_address'], ['decimals', 'mint'],)
    167     elif v == 'default' or v == 'bytecode':
    168         return ([], ['version'],)
    169     raise ValueError('unknown command: ' + v)