erc20-demurrage-token/python/erc20_demurrage_token/token.py

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# standard imports
import os
import logging
# external imports
from chainlib.eth.tx import (
TxFactory,
TxFormat,
)
from chainlib.hash import keccak256_string_to_hex
from chainlib.eth.contract import (
ABIContractEncoder,
ABIContractType,
abi_decode_single,
)
from chainlib.eth.constant import ZERO_ADDRESS
from chainlib.jsonrpc import jsonrpc_template
from eth_erc20 import ERC20
from hexathon import (
add_0x,
strip_0x,
)
# local imports
from erc20_demurrage_token.data import data_dir
logg = logging.getLogger(__name__)
class DemurrageTokenSettings:
def __init__(self):
self.name = None
self.symbol = None
self.decimals = None
self.demurrage_level = None
self.period_minutes = None
self.sink_address = None
class DemurrageToken(ERC20):
__abi = None
__bytecode = None
def constructor(self, sender_address, settings, redistribute=True, cap=0, tx_format=TxFormat.JSONRPC):
if not redistribute or cap:
raise NotImplementedError('token cap and sink only redistribution not yet implemented')
code = DemurrageToken.bytecode()
enc = ABIContractEncoder()
enc.string(settings.name)
enc.string(settings.symbol)
enc.uint256(settings.decimals)
enc.uint256(settings.demurrage_level)
enc.uint256(settings.period_minutes)
enc.address(settings.sink_address)
code += enc.get()
tx = self.template(sender_address, None, use_nonce=True)
tx = self.set_code(tx, code)
return self.finalize(tx, tx_format)
@staticmethod
def gas(code=None):
return 3500000
@staticmethod
def abi():
if DemurrageToken.__abi == None:
f = open(os.path.join(data_dir, 'DemurrageTokenMultiNocap.json'), 'r')
DemurrageToken.__abi = json.load(f)
f.close()
return DemurrageToken.__abi
@staticmethod
def bytecode():
if DemurrageToken.__bytecode == None:
f = open(os.path.join(data_dir, 'DemurrageTokenMultiNocap.bin'), 'r')
DemurrageToken.__bytecode = f.read()
f.close()
return DemurrageToken.__bytecode
def add_minter(self, contract_address, sender_address, address, tx_format=TxFormat.JSONRPC):
enc = ABIContractEncoder()
enc.method('addMinter')
enc.typ(ABIContractType.ADDRESS)
enc.address(address)
data = enc.get()
tx = self.template(sender_address, contract_address, use_nonce=True)
tx = self.set_code(tx, data)
tx = self.finalize(tx, tx_format)
return tx
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def remove_minter(self, contract_address, sender_address, address, tx_format=TxFormat.JSONRPC):
enc = ABIContractEncoder()
enc.method('removeMinter')
enc.typ(ABIContractType.ADDRESS)
enc.address(address)
data = enc.get()
tx = self.template(sender_address, contract_address, use_nonce=True)
tx = self.set_code(tx, data)
tx = self.finalize(tx, tx_format)
return tx
def mint_to(self, contract_address, sender_address, address, value, tx_format=TxFormat.JSONRPC):
enc = ABIContractEncoder()
enc.method('mintTo')
enc.typ(ABIContractType.ADDRESS)
enc.typ(ABIContractType.UINT256)
enc.address(address)
enc.uint256(value)
data = enc.get()
tx = self.template(sender_address, contract_address, use_nonce=True)
tx = self.set_code(tx, data)
tx = self.finalize(tx, tx_format)
return tx
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def to_base_amount(self, contract_address, value, sender_address=ZERO_ADDRESS):
o = jsonrpc_template()
o['method'] = 'eth_call'
enc = ABIContractEncoder()
enc.method('toBaseAmount')
enc.typ(ABIContractType.UINT256)
enc.uint256(value)
data = add_0x(enc.get())
tx = self.template(sender_address, contract_address)
tx = self.set_code(tx, data)
o['params'].append(self.normalize(tx))
o['params'].append('latest')
return o
def apply_demurrage(self, contract_address, sender_address):
return self.transact_noarg('applyDemurrage', contract_address, sender_address)
def actual_period(self, contract_address, sender_address=ZERO_ADDRESS):
return self.call_noarg('actualPeriod', contract_address, sender_address=sender_address)
def demurrage_amount(self, contract_address, sender_address=ZERO_ADDRESS):
return self.call_noarg('demurrageAmount', contract_address, sender_address=sender_address)
def parse_actual_period(self, v):
return abi_decode_single(ABIContractType.UINT256, v)
def parse_demurrage_amount(self, v):
return abi_decode_single(ABIContractType.UINT256, v)
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def parse_to_base_amount(self, v):
return abi_decode_single(ABIContractType.UINT256, v)