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 = {}
__bytecode = {}
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valid_modes = [
'MultiNocap',
'SingleNocap',
'MultiCap',
'SingleCap',
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]
def constructor(self, sender_address, settings, redistribute=True, cap=0, tx_format=TxFormat.JSONRPC):
if int(cap) < 0:
raise ValueError('cap must be 0 or positive integer')
code = DemurrageToken.bytecode(multi=redistribute, cap=cap>0)
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)
if cap > 0:
enc.uint256(cap)
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 __to_contract_name(multi, cap):
name = 'DemurrageToken'
if multi:
name += 'Multi'
else:
name += 'Single'
if cap:
name += 'Cap'
else:
name += 'Nocap'
return name
@staticmethod
def abi(multi=True, cap=False):
name = DemurrageToken.__to_contract_name(multi, cap)
if DemurrageToken.__abi.get(name) == None:
f = open(os.path.join(data_dir, name + '.json'), 'r')
DemurrageToken.__abi[name] = json.load(f)
f.close()
return DemurrageToken.__abi[name]
@staticmethod
def bytecode(multi=True, cap=False):
name = DemurrageToken.__to_contract_name(multi, cap)
if DemurrageToken.__bytecode.get(name) == None:
f = open(os.path.join(data_dir, name + '.bin'), 'r')
DemurrageToken.__bytecode[name] = f.read()
f.close()
return DemurrageToken.__bytecode[name]
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
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def remainder(self, contract_address, parts, whole, sender_address=ZERO_ADDRESS):
o = jsonrpc_template()
o['method'] = 'eth_call'
enc = ABIContractEncoder()
enc.method('remainder')
enc.typ(ABIContractType.UINT256)
enc.typ(ABIContractType.UINT256)
enc.uint256(parts)
enc.uint256(whole)
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
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def redistributions(self, contract_address, idx, sender_address=ZERO_ADDRESS):
o = jsonrpc_template()
o['method'] = 'eth_call'
enc = ABIContractEncoder()
enc.method('redistributions')
enc.typ(ABIContractType.UINT256)
enc.uint256(idx)
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
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def account_period(self, contract_address, address, sender_address=ZERO_ADDRESS):
o = jsonrpc_template()
o['method'] = 'eth_call'
enc = ABIContractEncoder()
enc.method('accountPeriod')
enc.typ(ABIContractType.ADDRESS)
enc.address(address)
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
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def to_redistribution_period(self, contract_address, redistribution, sender_address=ZERO_ADDRESS):
o = jsonrpc_template()
o['method'] = 'eth_call'
enc = ABIContractEncoder()
enc.method('toRedistributionPeriod')
enc.typ(ABIContractType.BYTES32)
enc.bytes32(redistribution)
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)
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def change_period(self, contract_address, sender_address):
return self.transact_noarg('changePeriod', contract_address, sender_address)
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def apply_redistribution_on_account(self, contract_address, sender_address, address, tx_format=TxFormat.JSONRPC):
enc = ABIContractEncoder()
enc.method('applyRedistributionOnAccount')
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 actual_period(self, contract_address, sender_address=ZERO_ADDRESS):
return self.call_noarg('actualPeriod', contract_address, sender_address=sender_address)
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def period_start(self, contract_address, sender_address=ZERO_ADDRESS):
return self.call_noarg('periodStart', contract_address, sender_address=sender_address)
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def period_duration(self, contract_address, sender_address=ZERO_ADDRESS):
return self.call_noarg('periodDuration', contract_address, sender_address=sender_address)
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def demurrage_amount(self, contract_address, sender_address=ZERO_ADDRESS):
return self.call_noarg('demurrageAmount', contract_address, sender_address=sender_address)
def supply_cap(self, contract_address, sender_address=ZERO_ADDRESS):
return self.call_noarg('supplyCap', contract_address, sender_address=sender_address)
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@classmethod
def parse_actual_period(self, v):
return abi_decode_single(ABIContractType.UINT256, v)
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@classmethod
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def parse_period_start(self, v):
return abi_decode_single(ABIContractType.UINT256, v)
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@classmethod
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def parse_period_duration(self, v):
return abi_decode_single(ABIContractType.UINT256, v)
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@classmethod
def parse_demurrage_amount(self, v):
return abi_decode_single(ABIContractType.UINT256, v)
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@classmethod
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def parse_remainder(self, v):
return abi_decode_single(ABIContractType.UINT256, v)
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@classmethod
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def parse_to_base_amount(self, v):
return abi_decode_single(ABIContractType.UINT256, v)
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@classmethod
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def parse_redistributions(self, v):
return abi_decode_single(ABIContractType.BYTES32, v)
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@classmethod
def parse_account_period(self, v):
return abi_decode_single(ABIContractType.ADDRESS, v)
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@classmethod
def parse_to_redistribution_period(self, v):
return abi_decode_single(ABIContractType.UINT256, v)
@classmethod
def parse_supply_cap(self, v):
return abi_decode_single(ABIContractType.UINT256, v)