Bump eth-erc20. add initial single and cap contract adaptations
This commit is contained in:
nolash
parent
3c871e5758
commit
093fcbccd5
GPG Key ID:
21D2E7BB88C2A746
File diff suppressed because one or more lines are too long
File diff suppressed because one or more lines are too long
File diff suppressed because one or more lines are too long
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@ -40,13 +40,13 @@ class DemurrageTokenSettings:
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class DemurrageToken(ERC20):
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__abi = None
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__bytecode = None
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__abi = {}
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__bytecode = {}
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def constructor(self, sender_address, settings, redistribute=True, cap=0, tx_format=TxFormat.JSONRPC):
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if not redistribute or cap:
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raise NotImplementedError('token cap and sink only redistribution not yet implemented')
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code = DemurrageToken.bytecode()
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if int(cap) < 0:
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raise ValueError('cap must be 0 or positive integer')
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code = DemurrageToken.bytecode(multi=redistribute, cap=cap>0)
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enc = ABIContractEncoder()
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enc.string(settings.name)
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enc.string(settings.symbol)
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@ -64,22 +64,39 @@ class DemurrageToken(ERC20):
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def gas(code=None):
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return 3500000
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@staticmethod
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def abi():
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if DemurrageToken.__abi == None:
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f = open(os.path.join(data_dir, 'DemurrageTokenMultiNocap.json'), 'r')
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DemurrageToken.__abi = json.load(f)
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f.close()
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return DemurrageToken.__abi
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def __to_contract_name(multi, cap):
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name = 'DemurrageToken'
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if multi:
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name += 'Multi'
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else:
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name += 'Single'
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if cap:
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name += 'Cap'
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else:
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name += 'Nocap'
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return name
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@staticmethod
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def bytecode():
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if DemurrageToken.__bytecode == None:
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f = open(os.path.join(data_dir, 'DemurrageTokenMultiNocap.bin'), 'r')
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DemurrageToken.__bytecode = f.read()
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def abi(multi=True, cap=False):
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name = DemurrageToken.__to_contract_name(multi, cap)
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if DemurrageToken.__abi.get(name) == None:
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f = open(os.path.join(data_dir, name + '.json'), 'r')
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DemurrageToken.__abi[name] = json.load(f)
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f.close()
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return DemurrageToken.__bytecode
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return DemurrageToken.__abi[name]
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@staticmethod
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def bytecode(multi=True, cap=False):
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name = DemurrageToken.__to_contract_name(multi, cap)
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if DemurrageToken.__bytecode.get(name) == None:
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f = open(os.path.join(data_dir, name + '.bin'), 'r')
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DemurrageToken.__bytecode[name] = f.read()
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f.close()
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return DemurrageToken.__bytecode[name]
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def add_minter(self, contract_address, sender_address, address, tx_format=TxFormat.JSONRPC):
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@ -1,3 +1,3 @@
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chainlib~=0.0.3rc3
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eth-erc20~=0.0.9a3
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eth-erc20~=0.0.9a4
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crypto-dev-signer~=0.4.14b3
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@ -35,6 +35,10 @@ class TestDemurrage(EthTesterCase):
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def setUp(self):
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super(TestDemurrage, self).setUp()
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self.tax_level = TAX_LEVEL
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self.period = PERIOD
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nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
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self.settings = DemurrageTokenSettings()
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self.settings.name = 'Foo Token'
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@ -64,16 +68,31 @@ class TestDemurrage(EthTesterCase):
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class TestDemurrageDefault(TestDemurrage):
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def __deploy(self, interface):
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self.default_supply = 1000000000000
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self.supply_cap = self.default_supply * 10
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(tx_hash, o) = interface.constructor(self.accounts[0], self.settings, redistribute=True, cap=0)
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r = self.rpc.do(o)
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o = receipt(tx_hash)
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r = self.rpc.do(o)
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self.assertEqual(r['status'], 1)
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self.addresses['MultiNocap'] = r['contract_address']
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(tx_hash, o) = interface.constructor(self.accounts[0], self.settings, redistribute=False, cap=0)
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r = self.rpc.do(o)
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o = receipt(tx_hash)
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r = self.rpc.do(o)
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self.assertEqual(r['status'], 1)
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self.addresses['SingleNocap'] = r['contract_address']
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def setUp(self):
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super(TestDemurrageDefault, self).setUp()
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nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
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c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
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(tx_hash, o) = c.constructor(self.accounts[0], self.settings)
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r = self.rpc.do(o)
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o = receipt(tx_hash)
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r = self.rpc.do(o)
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self.assertEqual(r['status'], 1)
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self.address = r['contract_address']
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self.addresses = {}
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self.__deploy(c)
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self.address = self.addresses['MultiNocap']
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@ -26,11 +26,6 @@ logg = logging.getLogger()
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testdir = os.path.dirname(__file__)
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#BLOCKTIME = 5 # seconds
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TAX_LEVEL = 10000 * 2 # 2%
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#PERIOD = int(60/BLOCKTIME) * 60 * 24 * 30 # month
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PERIOD = 1
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class TestRedistribution(TestDemurrageDefault):
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@ -104,7 +99,7 @@ class TestRedistribution(TestDemurrageDefault):
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def test_redistribution_balance_on_zero_participants(self):
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supply = 1000000000000
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supply = self.default_supply
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nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
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c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
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@ -127,7 +122,7 @@ class TestRedistribution(TestDemurrageDefault):
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o = c.total_supply(self.address, sender_address=self.accounts[0])
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r = self.rpc.do(o)
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total_supply = c.parse_total_supply(r)
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sink_increment = int(total_supply * (TAX_LEVEL / 1000000))
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sink_increment = int(total_supply * (self.tax_level / 1000000))
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self.assertEqual(supply, total_supply)
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for l in rcpt['logs']:
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@ -136,14 +131,14 @@ class TestRedistribution(TestDemurrageDefault):
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self.assertEqual(period, 2)
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b = bytes.fromhex(strip_0x(l['data']))
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remainder = int.from_bytes(b, 'big')
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self.assertEqual(remainder, int((1000000 - TAX_LEVEL) * (10 ** 32)))
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self.assertEqual(remainder, int((1000000 - self.tax_level) * (10 ** 32)))
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o = c.balance_of(self.address, self.sink_address, sender_address=self.accounts[0])
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r = self.rpc.do(o)
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sink_balance = c.parse_balance_of(r)
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self.assertEqual(sink_balance, int(sink_increment * 0.98))
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self.assertEqual(sink_balance, int(sink_increment * (1000000 - TAX_LEVEL) / 1000000))
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self.assertEqual(sink_balance, int(sink_increment * (1000000 - self.tax_level) / 1000000))
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o = c.balance_of(self.address, self.accounts[1], sender_address=self.accounts[0])
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r = self.rpc.do(o)
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@ -215,14 +210,14 @@ class TestRedistribution(TestDemurrageDefault):
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r = self.rpc.do(o)
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bummer_balance = c.parse_balance_of(r)
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self.assertEqual(bummer_balance, mint_amount - (mint_amount * (TAX_LEVEL / 1000000)))
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self.assertEqual(bummer_balance, mint_amount - (mint_amount * (self.tax_level / 1000000)))
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logg.debug('bal {} '.format(bummer_balance))
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o = c.balance_of(self.address, self.accounts[1], sender_address=self.accounts[0])
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r = self.rpc.do(o)
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bummer_balance = c.parse_balance_of(r)
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spender_balance = mint_amount - spend_amount
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spender_decayed_balance = int(spender_balance - (spender_balance * (TAX_LEVEL / 1000000)))
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spender_decayed_balance = int(spender_balance - (spender_balance * (self.tax_level / 1000000)))
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self.assertEqual(bummer_balance, spender_decayed_balance)
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logg.debug('bal {} '.format(bummer_balance))
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@ -254,9 +249,9 @@ class TestRedistribution(TestDemurrageDefault):
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actual_period = c.parse_actual_period(r)
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logg.debug('period {}'.format(actual_period))
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redistribution = int((z / 2) * (TAX_LEVEL / 1000000))
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redistribution = int((z / 2) * (self.tax_level / 1000000))
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spender_new_base_balance = ((mint_amount - spend_amount) + redistribution)
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spender_new_decayed_balance = int(spender_new_base_balance - (spender_new_base_balance * (TAX_LEVEL / 1000000)))
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spender_new_decayed_balance = int(spender_new_base_balance - (spender_new_base_balance * (self.tax_level / 1000000)))
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o = c.balance_of(self.address, self.accounts[1], sender_address=self.accounts[0])
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r = self.rpc.do(o)
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@ -0,0 +1,61 @@
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import os
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import unittest
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import json
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import logging
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# external imports
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from chainlib.eth.constant import ZERO_ADDRESS
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from chainlib.eth.nonce import RPCNonceOracle
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from chainlib.eth.tx import receipt
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from chainlib.eth.block import block_latest
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from chainlib.eth.address import to_checksum_address
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from hexathon import (
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strip_0x,
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add_0x,
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)
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# local imports
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from erc20_demurrage_token import DemurrageToken
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# test imports
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from tests.base import TestDemurrageDefault
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logging.basicConfig(level=logging.DEBUG)
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logg = logging.getLogger()
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testdir = os.path.dirname(__file__)
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class TestRedistributionSingle(TestDemurrageDefault):
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def test_single_even_if_multiple(self):
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nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
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c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
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(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[1], 100000000)
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r = self.rpc.do(o)
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external_address = to_checksum_address('0x' + os.urandom(20).hex())
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nonce_oracle = RPCNonceOracle(self.accounts[2], self.rpc)
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c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
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(tx_hash, o) = c.transfer(self.address, self.accounts[1], external_address, 10000000)
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r = self.rpc.do(o)
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nonce_oracle = RPCNonceOracle(self.accounts[3], self.rpc)
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c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
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(tx_hash, o) = c.transfer(self.address, self.accounts[2], external_address, 20000000)
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r = self.rpc.do(o)
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self.backend.time_travel(self.start_time + 61)
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(tx_hash, o) = c.apply_demurrage(self.address, self.accounts[0])
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self.rpc.do(o)
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o = receipt(tx_hash)
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rcpt = self.rpc.do(o)
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self.assertEqual(rcpt['status'], 1)
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(tx_hash, o) = c.change_period(self.address, self.accounts[0])
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self.rpc.do(o)
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o = receipt(tx_hash)
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r = self.rpc.do(o)
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self.assertEqual(r['status'], 1)
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@ -0,0 +1,616 @@
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pragma solidity > 0.6.11;
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// SPDX-License-Identifier: GPL-3.0-or-later
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contract DemurrageTokenMultiCap {
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// Redistribution bit field, with associated shifts and masks
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// (Uses sub-byte boundaries)
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bytes32[] public redistributions; // uint1(isFractional) | uint95(unused) | uint20(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
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uint8 constant shiftRedistributionPeriod = 0;
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uint256 constant maskRedistributionPeriod = 0x00000000000000000000000000000000000000000000000000000000ffffffff; // (1 << 32) - 1
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uint8 constant shiftRedistributionValue = 32;
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uint256 constant maskRedistributionValue = 0x00000000000000000000000000000000000000ffffffffffffffffff00000000; // ((1 << 72) - 1) << 32
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uint8 constant shiftRedistributionParticipants = 104;
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uint256 constant maskRedistributionParticipants = 0x00000000000000000000000000000fffffffff00000000000000000000000000; // ((1 << 36) - 1) << 104
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uint8 constant shiftRedistributionDemurrage = 140;
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uint256 constant maskRedistributionDemurrage = 0x000000000000000000000000fffff00000000000000000000000000000000000; // ((1 << 20) - 1) << 140
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uint8 constant shiftRedistributionIsFractional = 255;
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uint256 constant maskRedistributionIsFractional = 0x8000000000000000000000000000000000000000000000000000000000000000; // 1 << 255
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// Account bit field, with associated shifts and masks
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// Mirrors structure of redistributions for consistency
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mapping (address => bytes32) account; // uint152(unused) | uint32(period) | uint72(value)
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uint8 constant shiftAccountValue = 0;
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uint256 constant maskAccountValue = 0x0000000000000000000000000000000000000000000000ffffffffffffffffff; // (1 << 72) - 1
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uint8 constant shiftAccountPeriod = 72;
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uint256 constant maskAccountPeriod = 0x00000000000000000000000000000000000000ffffffff000000000000000000; // ((1 << 32) - 1) << 72
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// Cached demurrage amount, ppm with 38 digit resolution
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uint128 public demurrageAmount;
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// Cached demurrage period; the period for which demurrageAmount was calculated
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uint128 public demurragePeriod;
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// Implements EIP172
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address public owner;
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address newOwner;
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// Implements ERC20
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string public name;
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// Implements ERC20
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string public symbol;
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// Implements ERC20
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uint256 public decimals;
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// Implements ERC20
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uint256 public totalSupply;
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// Maximum amount of tokens that can be minted
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uint256 public supplyCap;
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// Minimum amount of (demurraged) tokens an account must spend to participate in redistribution for a particular period
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uint256 public minimumParticipantSpend;
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// 128 bit resolution of the demurrage divisor
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// (this constant x 1000000 is contained within 128 bits)
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uint256 constant ppmDivider = 100000000000000000000000000000000;
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// Timestamp of start of periods (time which contract constructor was called)
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uint256 public immutable periodStart;
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// Duration of a single redistribution period in seconds
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uint256 public immutable periodDuration;
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// Demurrage in ppm per minute
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uint256 public immutable taxLevel;
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// Addresses allowed to mint new tokens
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mapping (address => bool) minter;
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// Storage for ERC20 approve/transferFrom methods
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mapping (address => mapping (address => uint256 ) ) allowance; // holder -> spender -> amount (amount is subject to demurrage)
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// Address to send unallocated redistribution tokens
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address sinkAddress;
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// Implements ERC20
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event Transfer(address indexed _from, address indexed _to, uint256 _value);
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// Implements ERC20
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event Approval(address indexed _owner, address indexed _spender, uint256 _value);
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// New tokens minted
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event Mint(address indexed _minter, address indexed _beneficiary, uint256 _value);
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// New demurrage cache milestone calculated
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event Decayed(uint256 indexed _period, uint256 indexed _periodCount, uint256 indexed _oldAmount, uint256 _newAmount);
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// When a new period threshold has been crossed
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event Period(uint256 _period);
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// Redistribution applied on a single eligible account
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event Redistribution(address indexed _account, uint256 indexed _period, uint256 _value);
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// Temporary event used in development, will be removed on prod
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event Debug(bytes32 _foo);
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// EIP173
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event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); // EIP173
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constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _taxLevelMinute, uint256 _periodMinutes, address _defaultSinkAddress uint256 _supplyCap) public {
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// ACL setup
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owner = msg.sender;
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minter[owner] = true;
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// ERC20 setup
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name = _name;
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symbol = _symbol;
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decimals = _decimals;
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// Demurrage setup
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periodStart = block.timestamp;
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periodDuration = _periodMinutes * 60;
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demurrageAmount = uint128(ppmDivider * 1000000); // Represents 38 decimal places
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demurragePeriod = 1;
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taxLevel = _taxLevelMinute; // Represents 38 decimal places
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bytes32 initialRedistribution = toRedistribution(0, 1000000, 0, 1);
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redistributions.push(initialRedistribution);
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// Misc settings
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supplyCap = supplyCap;
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sinkAddress = _defaultSinkAddress;
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minimumParticipantSpend = 10 ** uint256(_decimals);
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}
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// Given address will be allowed to call the mintTo() function
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function addMinter(address _minter) public returns (bool) {
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require(msg.sender == owner);
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minter[_minter] = true;
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return true;
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}
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// Given address will no longer be allowed to call the mintTo() function
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function removeMinter(address _minter) public returns (bool) {
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require(msg.sender == owner || _minter == msg.sender);
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minter[_minter] = false;
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return true;
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}
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/// Implements ERC20
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function balanceOf(address _account) public view returns (uint256) {
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uint256 baseBalance;
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uint256 currentDemurragedAmount;
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uint256 periodCount;
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baseBalance = baseBalanceOf(_account);
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periodCount = actualPeriod() - demurragePeriod;
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currentDemurragedAmount = uint128(decayBy(demurrageAmount, periodCount));
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return (baseBalance * currentDemurragedAmount) / (ppmDivider * 1000000);
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}
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/// Balance unmodified by demurrage
|
||||
function baseBalanceOf(address _account) public view returns (uint256) {
|
||||
return uint256(account[_account]) & maskAccountValue;
|
||||
}
|
||||
|
||||
/// Increases base balance for a single account
|
||||
function increaseBaseBalance(address _account, uint256 _delta) private returns (bool) {
|
||||
uint256 oldBalance;
|
||||
uint256 newBalance;
|
||||
uint256 workAccount;
|
||||
|
||||
workAccount = uint256(account[_account]);
|
||||
|
||||
if (_delta == 0) {
|
||||
return false;
|
||||
}
|
||||
|
||||
oldBalance = baseBalanceOf(_account);
|
||||
newBalance = oldBalance + _delta;
|
||||
require(uint160(newBalance) > uint160(oldBalance), 'ERR_WOULDWRAP'); // revert if increase would result in a wrapped value
|
||||
workAccount &= (~maskAccountValue);
|
||||
workAccount |= (newBalance & maskAccountValue);
|
||||
account[_account] = bytes32(workAccount);
|
||||
return true;
|
||||
}
|
||||
|
||||
/// Decreases base balance for a single account
|
||||
function decreaseBaseBalance(address _account, uint256 _delta) private returns (bool) {
|
||||
uint256 oldBalance;
|
||||
uint256 newBalance;
|
||||
uint256 workAccount;
|
||||
|
||||
workAccount = uint256(account[_account]);
|
||||
|
||||
if (_delta == 0) {
|
||||
return false;
|
||||
}
|
||||
|
||||
oldBalance = baseBalanceOf(_account);
|
||||
require(oldBalance >= _delta, 'ERR_OVERSPEND'); // overspend guard
|
||||
newBalance = oldBalance - _delta;
|
||||
workAccount &= (~maskAccountValue);
|
||||
workAccount |= (newBalance & maskAccountValue);
|
||||
account[_account] = bytes32(workAccount);
|
||||
return true;
|
||||
}
|
||||
|
||||
// Creates new tokens out of thin air, and allocates them to the given address
|
||||
// Triggers tax
|
||||
function mintTo(address _beneficiary, uint256 _amount) external returns (bool) {
|
||||
uint256 baseAmount;
|
||||
|
||||
require(minter[msg.sender]);
|
||||
require(_amount + totalSupply <= supplyCap);
|
||||
|
||||
changePeriod();
|
||||
baseAmount = _amount;
|
||||
totalSupply += _amount;
|
||||
increaseBaseBalance(_beneficiary, baseAmount);
|
||||
emit Mint(msg.sender, _beneficiary, _amount);
|
||||
saveRedistributionSupply();
|
||||
return true;
|
||||
}
|
||||
|
||||
// Deserializes the redistribution word
|
||||
// uint1(isFractional) | uint95(unused) | uint20(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
|
||||
function toRedistribution(uint256 _participants, uint256 _demurrageModifierPpm, uint256 _value, uint256 _period) private pure returns(bytes32) {
|
||||
bytes32 redistribution;
|
||||
|
||||
redistribution |= bytes32((_demurrageModifierPpm << shiftRedistributionDemurrage) & maskRedistributionDemurrage);
|
||||
redistribution |= bytes32((_participants << shiftRedistributionParticipants) & maskRedistributionParticipants);
|
||||
redistribution |= bytes32((_value << shiftRedistributionValue) & maskRedistributionValue);
|
||||
redistribution |= bytes32(_period & maskRedistributionPeriod);
|
||||
return redistribution;
|
||||
}
|
||||
|
||||
// Serializes the demurrage period part of the redistribution word
|
||||
function toRedistributionPeriod(bytes32 redistribution) public pure returns (uint256) {
|
||||
return uint256(redistribution) & maskRedistributionPeriod;
|
||||
}
|
||||
|
||||
// Serializes the supply part of the redistribution word
|
||||
function toRedistributionSupply(bytes32 redistribution) public pure returns (uint256) {
|
||||
return (uint256(redistribution) & maskRedistributionValue) >> shiftRedistributionValue;
|
||||
}
|
||||
|
||||
// Serializes the number of participants part of the redistribution word
|
||||
function toRedistributionParticipants(bytes32 redistribution) public pure returns (uint256) {
|
||||
return (uint256(redistribution) & maskRedistributionParticipants) >> shiftRedistributionParticipants;
|
||||
}
|
||||
|
||||
// Serializes the number of participants part of the redistribution word
|
||||
function toRedistributionDemurrageModifier(bytes32 redistribution) public pure returns (uint256) {
|
||||
return (uint256(redistribution) & maskRedistributionDemurrage) >> shiftRedistributionDemurrage;
|
||||
}
|
||||
|
||||
// Client accessor to the redistributions array length
|
||||
function redistributionCount() public view returns (uint256) {
|
||||
return redistributions.length;
|
||||
}
|
||||
|
||||
// Add number of participants for the current redistribution period by one
|
||||
function incrementRedistributionParticipants() private returns (bool) {
|
||||
bytes32 currentRedistribution;
|
||||
uint256 tmpRedistribution;
|
||||
uint256 participants;
|
||||
|
||||
currentRedistribution = redistributions[redistributions.length-1];
|
||||
participants = toRedistributionParticipants(currentRedistribution) + 1;
|
||||
tmpRedistribution = uint256(currentRedistribution);
|
||||
tmpRedistribution &= (~maskRedistributionParticipants);
|
||||
tmpRedistribution |= ((participants << shiftRedistributionParticipants) & maskRedistributionParticipants);
|
||||
|
||||
redistributions[redistributions.length-1] = bytes32(tmpRedistribution);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
// Save the current total supply amount to the current redistribution period
|
||||
function saveRedistributionSupply() private returns (bool) {
|
||||
uint256 currentRedistribution;
|
||||
|
||||
currentRedistribution = uint256(redistributions[redistributions.length-1]);
|
||||
currentRedistribution &= (~maskRedistributionValue);
|
||||
currentRedistribution |= (totalSupply << shiftRedistributionValue);
|
||||
|
||||
redistributions[redistributions.length-1] = bytes32(currentRedistribution);
|
||||
return true;
|
||||
}
|
||||
|
||||
// Get the demurrage period of the current block number
|
||||
function actualPeriod() public view returns (uint128) {
|
||||
return uint128((block.timestamp - periodStart) / periodDuration + 1);
|
||||
}
|
||||
|
||||
// Add an entered demurrage period to the redistribution array
|
||||
function checkPeriod() private view returns (bytes32) {
|
||||
bytes32 lastRedistribution;
|
||||
uint256 currentPeriod;
|
||||
|
||||
lastRedistribution = redistributions[redistributions.length-1];
|
||||
currentPeriod = this.actualPeriod();
|
||||
if (currentPeriod <= toRedistributionPeriod(lastRedistribution)) {
|
||||
return bytes32(0x00);
|
||||
}
|
||||
return lastRedistribution;
|
||||
}
|
||||
|
||||
// Deserialize the pemurrage period for the given account is participating in
|
||||
function accountPeriod(address _account) public view returns (uint256) {
|
||||
return (uint256(account[_account]) & maskAccountPeriod) >> shiftAccountPeriod;
|
||||
}
|
||||
|
||||
// Save the given demurrage period as the currently participation period for the given address
|
||||
function registerAccountPeriod(address _account, uint256 _period) private returns (bool) {
|
||||
account[_account] &= bytes32(~maskAccountPeriod);
|
||||
account[_account] |= bytes32((_period << shiftAccountPeriod) & maskAccountPeriod);
|
||||
incrementRedistributionParticipants();
|
||||
return true;
|
||||
}
|
||||
|
||||
// Determine whether the unit number is rounded down, rounded up or evenly divides.
|
||||
// Returns 0 if evenly distributed, or the remainder as a positive number
|
||||
// A _numParts value 0 will be interpreted as the value 1
|
||||
function remainder(uint256 _numParts, uint256 _sumWhole) public pure returns (uint256) {
|
||||
uint256 unit;
|
||||
uint256 truncatedResult;
|
||||
|
||||
if (_numParts == 0) { // no division by zero please
|
||||
revert('ERR_NUMPARTS_ZERO');
|
||||
}
|
||||
require(_numParts < _sumWhole); // At least you are never LESS than the sum of your parts. Think about that.
|
||||
|
||||
unit = _sumWhole / _numParts;
|
||||
truncatedResult = unit * _numParts;
|
||||
return _sumWhole - truncatedResult;
|
||||
}
|
||||
|
||||
// Called in the edge case where participant number is 0. It will override the participant count to 1.
|
||||
// Returns the remainder sent to the sink address
|
||||
function applyDefaultRedistribution(bytes32 _redistribution) private returns (uint256) {
|
||||
uint256 redistributionSupply;
|
||||
uint256 redistributionPeriod;
|
||||
uint256 unit;
|
||||
uint256 truncatedResult;
|
||||
|
||||
redistributionSupply = toRedistributionSupply(_redistribution);
|
||||
|
||||
unit = (redistributionSupply * taxLevel) / 1000000;
|
||||
truncatedResult = (unit * 1000000) / taxLevel;
|
||||
|
||||
if (truncatedResult < redistributionSupply) {
|
||||
redistributionPeriod = toRedistributionPeriod(_redistribution); // since we reuse period here, can possibly be optimized by passing period instead
|
||||
redistributions[redistributionPeriod-1] &= bytes32(~maskRedistributionParticipants); // just to be safe, zero out all participant count data, in this case there will be only one
|
||||
redistributions[redistributionPeriod-1] |= bytes32(maskRedistributionIsFractional | (1 << shiftRedistributionParticipants));
|
||||
}
|
||||
|
||||
increaseBaseBalance(sinkAddress, unit / ppmDivider);
|
||||
return unit;
|
||||
}
|
||||
|
||||
// sets the remainder bit for the given period and books the remainder to the sink address balance
|
||||
// returns false if no change was made
|
||||
function applyRemainderOnPeriod(uint256 _remainder, uint256 _period) private returns (bool) {
|
||||
uint256 periodSupply;
|
||||
|
||||
if (_remainder == 0) {
|
||||
return false;
|
||||
}
|
||||
|
||||
// TODO: is this needed?
|
||||
redistributions[_period-1] |= bytes32(maskRedistributionIsFractional);
|
||||
|
||||
periodSupply = toRedistributionSupply(redistributions[_period-1]);
|
||||
increaseBaseBalance(sinkAddress, periodSupply - _remainder);
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
// Calculate and cache the demurrage value corresponding to the (period of the) time of the method call
|
||||
function applyDemurrage() public returns (bool) {
|
||||
uint128 epochPeriodCount;
|
||||
uint128 periodCount;
|
||||
uint256 lastDemurrageAmount;
|
||||
uint256 newDemurrageAmount;
|
||||
|
||||
epochPeriodCount = actualPeriod();
|
||||
periodCount = epochPeriodCount - demurragePeriod;
|
||||
if (periodCount == 0) {
|
||||
return false;
|
||||
}
|
||||
lastDemurrageAmount = demurrageAmount;
|
||||
demurrageAmount = uint128(decayBy(lastDemurrageAmount, periodCount));
|
||||
demurragePeriod = epochPeriodCount;
|
||||
emit Decayed(epochPeriodCount, periodCount, lastDemurrageAmount, demurrageAmount);
|
||||
return true;
|
||||
}
|
||||
|
||||
// Return timestamp of start of period threshold
|
||||
function getPeriodTimeDelta(uint256 _periodCount) public view returns (uint256) {
|
||||
return periodStart + (_periodCount * periodDuration);
|
||||
}
|
||||
|
||||
// Amount of demurrage cycles inbetween the current timestamp and the given target time
|
||||
function demurrageCycles(uint256 _target) public view returns (uint256) {
|
||||
return (block.timestamp - _target) / 60;
|
||||
}
|
||||
|
||||
// Recalculate the demurrage modifier for the new period
|
||||
// After this, all REPORTED balances will have been reduced by the corresponding ratio (but the effecive totalsupply stays the same)
|
||||
function changePeriod() public returns (bool) {
|
||||
bytes32 currentRedistribution;
|
||||
bytes32 nextRedistribution;
|
||||
uint256 currentPeriod;
|
||||
uint256 currentParticipants;
|
||||
uint256 currentRemainder;
|
||||
uint256 currentDemurrageAmount;
|
||||
uint256 nextRedistributionDemurrage;
|
||||
uint256 demurrageCounts;
|
||||
uint256 periodTimestamp;
|
||||
uint256 nextPeriod;
|
||||
|
||||
currentRedistribution = checkPeriod();
|
||||
if (currentRedistribution == bytes32(0x00)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
currentPeriod = toRedistributionPeriod(currentRedistribution);
|
||||
nextPeriod = currentPeriod + 1;
|
||||
periodTimestamp = getPeriodTimeDelta(currentPeriod);
|
||||
|
||||
applyDemurrage();
|
||||
currentDemurrageAmount = demurrageAmount;
|
||||
|
||||
demurrageCounts = demurrageCycles(periodTimestamp);
|
||||
if (demurrageCounts > 0) {
|
||||
nextRedistributionDemurrage = growBy(currentDemurrageAmount, demurrageCounts) / ppmDivider;
|
||||
} else {
|
||||
nextRedistributionDemurrage = currentDemurrageAmount / ppmDivider;
|
||||
}
|
||||
|
||||
nextRedistribution = toRedistribution(0, nextRedistributionDemurrage, totalSupply, nextPeriod);
|
||||
redistributions.push(nextRedistribution);
|
||||
|
||||
currentParticipants = toRedistributionParticipants(currentRedistribution);
|
||||
if (currentParticipants == 0) {
|
||||
currentRemainder = applyDefaultRedistribution(currentRedistribution);
|
||||
} else {
|
||||
currentRemainder = remainder(currentParticipants, totalSupply); // we can use totalSupply directly because it will always be the same as the recorded supply on the current redistribution
|
||||
applyRemainderOnPeriod(currentRemainder, currentPeriod);
|
||||
}
|
||||
emit Period(nextPeriod);
|
||||
return true;
|
||||
}
|
||||
|
||||
// Reverse a value reduced by demurrage by the given period to its original value
|
||||
function growBy(uint256 _value, uint256 _period) public view returns (uint256) {
|
||||
uint256 valueFactor;
|
||||
uint256 truncatedTaxLevel;
|
||||
|
||||
valueFactor = 1000000;
|
||||
truncatedTaxLevel = taxLevel / ppmDivider;
|
||||
|
||||
for (uint256 i = 0; i < _period; i++) {
|
||||
valueFactor = valueFactor + ((valueFactor * truncatedTaxLevel) / 1000000);
|
||||
}
|
||||
return (valueFactor * _value) / 1000000;
|
||||
}
|
||||
|
||||
// Calculate a value reduced by demurrage by the given period
|
||||
// TODO: higher precision if possible
|
||||
function decayBy(uint256 _value, uint256 _period) public view returns (uint256) {
|
||||
uint256 valueFactor;
|
||||
uint256 truncatedTaxLevel;
|
||||
|
||||
valueFactor = 1000000;
|
||||
truncatedTaxLevel = taxLevel / ppmDivider;
|
||||
|
||||
for (uint256 i = 0; i < _period; i++) {
|
||||
valueFactor = valueFactor - ((valueFactor * truncatedTaxLevel) / 1000000);
|
||||
}
|
||||
return (valueFactor * _value) / 1000000;
|
||||
}
|
||||
|
||||
// If the given account is participating in a period and that period has been crossed
|
||||
// THEN increase the base value of the account with its share of the value reduction of the period
|
||||
function applyRedistributionOnAccount(address _account) public returns (bool) {
|
||||
bytes32 periodRedistribution;
|
||||
uint256 supply;
|
||||
uint256 participants;
|
||||
uint256 baseValue;
|
||||
uint256 value;
|
||||
uint256 period;
|
||||
uint256 demurrage;
|
||||
|
||||
period = accountPeriod(_account);
|
||||
if (period == 0 || period >= actualPeriod()) {
|
||||
return false;
|
||||
}
|
||||
periodRedistribution = redistributions[period-1];
|
||||
participants = toRedistributionParticipants(periodRedistribution);
|
||||
if (participants == 0) {
|
||||
return false;
|
||||
}
|
||||
|
||||
supply = toRedistributionSupply(periodRedistribution);
|
||||
demurrage = toRedistributionDemurrageModifier(periodRedistribution);
|
||||
baseValue = ((supply / participants) * (taxLevel / 1000000)) / ppmDivider;
|
||||
value = (baseValue * demurrage) / 1000000;
|
||||
|
||||
// zero out period for the account
|
||||
account[_account] &= bytes32(~maskAccountPeriod);
|
||||
increaseBaseBalance(_account, value);
|
||||
|
||||
emit Redistribution(_account, period, value);
|
||||
return true;
|
||||
}
|
||||
|
||||
// Inflates the given amount according to the current demurrage modifier
|
||||
function toBaseAmount(uint256 _value) public view returns (uint256) {
|
||||
//return (_value * ppmDivider * 1000000) / toDemurrageAmount(demurrageModifier);
|
||||
return (_value * ppmDivider * 1000000) / demurrageAmount;
|
||||
}
|
||||
|
||||
// Implements ERC20, triggers tax and/or redistribution
|
||||
function approve(address _spender, uint256 _value) public returns (bool) {
|
||||
uint256 baseValue;
|
||||
|
||||
changePeriod();
|
||||
applyRedistributionOnAccount(msg.sender);
|
||||
|
||||
baseValue = toBaseAmount(_value);
|
||||
allowance[msg.sender][_spender] += baseValue;
|
||||
emit Approval(msg.sender, _spender, _value);
|
||||
return true;
|
||||
}
|
||||
|
||||
// Implements ERC20, triggers tax and/or redistribution
|
||||
function transfer(address _to, uint256 _value) public returns (bool) {
|
||||
uint256 baseValue;
|
||||
bool result;
|
||||
|
||||
changePeriod();
|
||||
applyRedistributionOnAccount(msg.sender);
|
||||
|
||||
baseValue = toBaseAmount(_value);
|
||||
result = transferBase(msg.sender, _to, baseValue);
|
||||
emit Transfer(msg.sender, _to, _value);
|
||||
return result;
|
||||
}
|
||||
|
||||
|
||||
// Implements ERC20, triggers tax and/or redistribution
|
||||
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
|
||||
uint256 baseValue;
|
||||
bool result;
|
||||
|
||||
changePeriod();
|
||||
applyRedistributionOnAccount(msg.sender);
|
||||
|
||||
baseValue = toBaseAmount(_value);
|
||||
require(allowance[_from][msg.sender] >= baseValue);
|
||||
|
||||
result = transferBase(_from, _to, baseValue);
|
||||
emit Transfer(_from, _to, _value);
|
||||
return result;
|
||||
}
|
||||
|
||||
// ERC20 transfer backend for transfer, transferFrom
|
||||
function transferBase(address _from, address _to, uint256 _value) private returns (bool) {
|
||||
uint256 period;
|
||||
|
||||
decreaseBaseBalance(_from, _value);
|
||||
increaseBaseBalance(_to, _value);
|
||||
|
||||
period = actualPeriod();
|
||||
if (_value >= minimumParticipantSpend && accountPeriod(_from) != period && _from != _to) {
|
||||
registerAccountPeriod(_from, period);
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
// Implements EIP173
|
||||
function transferOwnership(address _newOwner) public returns (bool) {
|
||||
require(msg.sender == owner);
|
||||
newOwner = _newOwner;
|
||||
}
|
||||
|
||||
// Implements OwnedAccepter
|
||||
function acceptOwnership() public returns (bool) {
|
||||
address oldOwner;
|
||||
|
||||
require(msg.sender == newOwner);
|
||||
oldOwner = owner;
|
||||
owner = newOwner;
|
||||
newOwner = address(0);
|
||||
emit OwnershipTransferred(oldOwner, owner);
|
||||
}
|
||||
|
||||
// Implements EIP165
|
||||
function supportsInterface(bytes4 _sum) public pure returns (bool) {
|
||||
if (_sum == 0xc6bb4b70) { // ERC20
|
||||
return true;
|
||||
}
|
||||
if (_sum == 0x449a52f8) { // Minter
|
||||
return true;
|
||||
}
|
||||
if (_sum == 0x01ffc9a7) { // EIP165
|
||||
return true;
|
||||
}
|
||||
if (_sum == 0x9493f8b2) { // EIP173
|
||||
return true;
|
||||
}
|
||||
if (_sum == 0x37a47be4) { // OwnedAccepter
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
|
@ -2,7 +2,7 @@ pragma solidity > 0.6.11;
|
|||
|
||||
// SPDX-License-Identifier: GPL-3.0-or-later
|
||||
|
||||
contract RedistributedDemurrageToken {
|
||||
contract DemurrageTokenMultiNocap {
|
||||
|
||||
// Redistribution bit field, with associated shifts and masks
|
||||
// (Uses sub-byte boundaries)
|
||||
|
|
|
|||
|
|
@ -0,0 +1,609 @@
|
|||
pragma solidity > 0.6.11;
|
||||
|
||||
// SPDX-License-Identifier: GPL-3.0-or-later
|
||||
|
||||
contract DemurrageTokenSingleNocap {
|
||||
|
||||
// Redistribution bit field, with associated shifts and masks
|
||||
// (Uses sub-byte boundaries)
|
||||
bytes32[] public redistributions; // uint1(isFractional) | uint95(unused) | uint20(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
|
||||
uint8 constant shiftRedistributionPeriod = 0;
|
||||
uint256 constant maskRedistributionPeriod = 0x00000000000000000000000000000000000000000000000000000000ffffffff; // (1 << 32) - 1
|
||||
uint8 constant shiftRedistributionValue = 32;
|
||||
uint256 constant maskRedistributionValue = 0x00000000000000000000000000000000000000ffffffffffffffffff00000000; // ((1 << 72) - 1) << 32
|
||||
uint8 constant shiftRedistributionParticipants = 104;
|
||||
uint256 constant maskRedistributionParticipants = 0x00000000000000000000000000000fffffffff00000000000000000000000000; // ((1 << 36) - 1) << 104
|
||||
uint8 constant shiftRedistributionDemurrage = 140;
|
||||
uint256 constant maskRedistributionDemurrage = 0x000000000000000000000000fffff00000000000000000000000000000000000; // ((1 << 20) - 1) << 140
|
||||
uint8 constant shiftRedistributionIsFractional = 255;
|
||||
uint256 constant maskRedistributionIsFractional = 0x8000000000000000000000000000000000000000000000000000000000000000; // 1 << 255
|
||||
|
||||
// Account bit field, with associated shifts and masks
|
||||
// Mirrors structure of redistributions for consistency
|
||||
mapping (address => bytes32) account; // uint152(unused) | uint32(period) | uint72(value)
|
||||
uint8 constant shiftAccountValue = 0;
|
||||
uint256 constant maskAccountValue = 0x0000000000000000000000000000000000000000000000ffffffffffffffffff; // (1 << 72) - 1
|
||||
uint8 constant shiftAccountPeriod = 72;
|
||||
uint256 constant maskAccountPeriod = 0x00000000000000000000000000000000000000ffffffff000000000000000000; // ((1 << 32) - 1) << 72
|
||||
|
||||
// Cached demurrage amount, ppm with 38 digit resolution
|
||||
uint128 public demurrageAmount;
|
||||
|
||||
// Cached demurrage period; the period for which demurrageAmount was calculated
|
||||
uint128 public demurragePeriod;
|
||||
|
||||
// Implements EIP172
|
||||
address public owner;
|
||||
|
||||
address newOwner;
|
||||
|
||||
// Implements ERC20
|
||||
string public name;
|
||||
|
||||
// Implements ERC20
|
||||
string public symbol;
|
||||
|
||||
// Implements ERC20
|
||||
uint256 public decimals;
|
||||
|
||||
// Implements ERC20
|
||||
uint256 public totalSupply;
|
||||
|
||||
// Minimum amount of (demurraged) tokens an account must spend to participate in redistribution for a particular period
|
||||
uint256 public minimumParticipantSpend;
|
||||
|
||||
// 128 bit resolution of the demurrage divisor
|
||||
// (this constant x 1000000 is contained within 128 bits)
|
||||
uint256 constant ppmDivider = 100000000000000000000000000000000;
|
||||
|
||||
// Timestamp of start of periods (time which contract constructor was called)
|
||||
uint256 public immutable periodStart;
|
||||
|
||||
// Duration of a single redistribution period in seconds
|
||||
uint256 public immutable periodDuration;
|
||||
|
||||
// Demurrage in ppm per minute
|
||||
uint256 public immutable taxLevel;
|
||||
|
||||
// Addresses allowed to mint new tokens
|
||||
mapping (address => bool) minter;
|
||||
|
||||
// Storage for ERC20 approve/transferFrom methods
|
||||
mapping (address => mapping (address => uint256 ) ) allowance; // holder -> spender -> amount (amount is subject to demurrage)
|
||||
|
||||
// Address to send unallocated redistribution tokens
|
||||
address sinkAddress;
|
||||
|
||||
// Implements ERC20
|
||||
event Transfer(address indexed _from, address indexed _to, uint256 _value);
|
||||
|
||||
// Implements ERC20
|
||||
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
|
||||
|
||||
// New tokens minted
|
||||
event Mint(address indexed _minter, address indexed _beneficiary, uint256 _value);
|
||||
|
||||
// New demurrage cache milestone calculated
|
||||
event Decayed(uint256 indexed _period, uint256 indexed _periodCount, uint256 indexed _oldAmount, uint256 _newAmount);
|
||||
|
||||
// When a new period threshold has been crossed
|
||||
event Period(uint256 _period);
|
||||
|
||||
// Redistribution applied on a single eligible account
|
||||
event Redistribution(address indexed _account, uint256 indexed _period, uint256 _value);
|
||||
|
||||
// Temporary event used in development, will be removed on prod
|
||||
event Debug(bytes32 _foo);
|
||||
|
||||
// EIP173
|
||||
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); // EIP173
|
||||
|
||||
constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _taxLevelMinute, uint256 _periodMinutes, address _defaultSinkAddress) public {
|
||||
// ACL setup
|
||||
owner = msg.sender;
|
||||
minter[owner] = true;
|
||||
|
||||
// ERC20 setup
|
||||
name = _name;
|
||||
symbol = _symbol;
|
||||
decimals = _decimals;
|
||||
|
||||
// Demurrage setup
|
||||
periodStart = block.timestamp;
|
||||
periodDuration = _periodMinutes * 60;
|
||||
demurrageAmount = uint128(ppmDivider * 1000000); // Represents 38 decimal places
|
||||
demurragePeriod = 1;
|
||||
taxLevel = _taxLevelMinute; // Represents 38 decimal places
|
||||
bytes32 initialRedistribution = toRedistribution(0, 1000000, 0, 1);
|
||||
redistributions.push(initialRedistribution);
|
||||
|
||||
// Misc settings
|
||||
sinkAddress = _defaultSinkAddress;
|
||||
minimumParticipantSpend = 10 ** uint256(_decimals);
|
||||
}
|
||||
|
||||
// Given address will be allowed to call the mintTo() function
|
||||
function addMinter(address _minter) public returns (bool) {
|
||||
require(msg.sender == owner);
|
||||
minter[_minter] = true;
|
||||
return true;
|
||||
}
|
||||
|
||||
// Given address will no longer be allowed to call the mintTo() function
|
||||
function removeMinter(address _minter) public returns (bool) {
|
||||
require(msg.sender == owner || _minter == msg.sender);
|
||||
minter[_minter] = false;
|
||||
return true;
|
||||
}
|
||||
|
||||
/// Implements ERC20
|
||||
function balanceOf(address _account) public view returns (uint256) {
|
||||
uint256 baseBalance;
|
||||
uint256 currentDemurragedAmount;
|
||||
uint256 periodCount;
|
||||
|
||||
baseBalance = baseBalanceOf(_account);
|
||||
|
||||
periodCount = actualPeriod() - demurragePeriod;
|
||||
|
||||
currentDemurragedAmount = uint128(decayBy(demurrageAmount, periodCount));
|
||||
|
||||
return (baseBalance * currentDemurragedAmount) / (ppmDivider * 1000000);
|
||||
}
|
||||
|
||||
/// Balance unmodified by demurrage
|
||||
function baseBalanceOf(address _account) public view returns (uint256) {
|
||||
return uint256(account[_account]) & maskAccountValue;
|
||||
//return uint256(account[_account]);
|
||||
}
|
||||
|
||||
/// Increases base balance for a single account
|
||||
function increaseBaseBalance(address _account, uint256 _delta) private returns (bool) {
|
||||
uint256 oldBalance;
|
||||
uint256 newBalance;
|
||||
uint256 workAccount;
|
||||
|
||||
workAccount = uint256(account[_account]);
|
||||
|
||||
if (_delta == 0) {
|
||||
return false;
|
||||
}
|
||||
|
||||
oldBalance = baseBalanceOf(_account);
|
||||
newBalance = oldBalance + _delta;
|
||||
require(uint160(newBalance) > uint160(oldBalance), 'ERR_WOULDWRAP'); // revert if increase would result in a wrapped value
|
||||
workAccount &= (~maskAccountValue);
|
||||
workAccount |= (newBalance & maskAccountValue);
|
||||
return true;
|
||||
}
|
||||
|
||||
/// Decreases base balance for a single account
|
||||
function decreaseBaseBalance(address _account, uint256 _delta) private returns (bool) {
|
||||
uint256 oldBalance;
|
||||
uint256 newBalance;
|
||||
uint256 workAccount;
|
||||
|
||||
workAccount = uint256(account[_account]);
|
||||
|
||||
if (_delta == 0) {
|
||||
return false;
|
||||
}
|
||||
|
||||
oldBalance = baseBalanceOf(_account);
|
||||
require(oldBalance >= _delta, 'ERR_OVERSPEND'); // overspend guard
|
||||
newBalance = oldBalance - _delta;
|
||||
workAccount &= (~maskAccountValue);
|
||||
workAccount |= (newBalance & maskAccountValue);
|
||||
account[_account] = bytes32(workAccount);
|
||||
return true;
|
||||
}
|
||||
|
||||
// Creates new tokens out of thin air, and allocates them to the given address
|
||||
// Triggers tax
|
||||
function mintTo(address _beneficiary, uint256 _amount) external returns (bool) {
|
||||
uint256 baseAmount;
|
||||
|
||||
require(minter[msg.sender]);
|
||||
|
||||
changePeriod();
|
||||
baseAmount = _amount;
|
||||
totalSupply += _amount;
|
||||
increaseBaseBalance(_beneficiary, baseAmount);
|
||||
emit Mint(msg.sender, _beneficiary, _amount);
|
||||
saveRedistributionSupply();
|
||||
return true;
|
||||
}
|
||||
|
||||
// Deserializes the redistribution word
|
||||
// uint1(isFractional) | uint95(unused) | uint20(demurrageModifier) | uint36(participants) | uint72(value) | uint32(period)
|
||||
function toRedistribution(uint256 _participants, uint256 _demurrageModifierPpm, uint256 _value, uint256 _period) private pure returns(bytes32) {
|
||||
bytes32 redistribution;
|
||||
|
||||
redistribution |= bytes32((_demurrageModifierPpm << shiftRedistributionDemurrage) & maskRedistributionDemurrage);
|
||||
redistribution |= bytes32((_participants << shiftRedistributionParticipants) & maskRedistributionParticipants);
|
||||
redistribution |= bytes32((_value << shiftRedistributionValue) & maskRedistributionValue);
|
||||
redistribution |= bytes32(_period & maskRedistributionPeriod);
|
||||
return redistribution;
|
||||
}
|
||||
|
||||
// Serializes the demurrage period part of the redistribution word
|
||||
function toRedistributionPeriod(bytes32 redistribution) public pure returns (uint256) {
|
||||
return uint256(redistribution) & maskRedistributionPeriod;
|
||||
}
|
||||
|
||||
// Serializes the supply part of the redistribution word
|
||||
function toRedistributionSupply(bytes32 redistribution) public pure returns (uint256) {
|
||||
return (uint256(redistribution) & maskRedistributionValue) >> shiftRedistributionValue;
|
||||
}
|
||||
|
||||
// Serializes the number of participants part of the redistribution word
|
||||
function toRedistributionParticipants(bytes32 redistribution) public pure returns (uint256) {
|
||||
return (uint256(redistribution) & maskRedistributionParticipants) >> shiftRedistributionParticipants;
|
||||
}
|
||||
|
||||
// Serializes the number of participants part of the redistribution word
|
||||
function toRedistributionDemurrageModifier(bytes32 redistribution) public pure returns (uint256) {
|
||||
return (uint256(redistribution) & maskRedistributionDemurrage) >> shiftRedistributionDemurrage;
|
||||
}
|
||||
|
||||
// Client accessor to the redistributions array length
|
||||
function redistributionCount() public view returns (uint256) {
|
||||
return redistributions.length;
|
||||
}
|
||||
|
||||
// Add number of participants for the current redistribution period by one
|
||||
function incrementRedistributionParticipants() private returns (bool) {
|
||||
bytes32 currentRedistribution;
|
||||
uint256 tmpRedistribution;
|
||||
uint256 participants;
|
||||
|
||||
currentRedistribution = redistributions[redistributions.length-1];
|
||||
participants = toRedistributionParticipants(currentRedistribution) + 1;
|
||||
tmpRedistribution = uint256(currentRedistribution);
|
||||
tmpRedistribution &= (~maskRedistributionParticipants);
|
||||
tmpRedistribution |= ((participants << shiftRedistributionParticipants) & maskRedistributionParticipants);
|
||||
|
||||
redistributions[redistributions.length-1] = bytes32(tmpRedistribution);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
// Save the current total supply amount to the current redistribution period
|
||||
function saveRedistributionSupply() private returns (bool) {
|
||||
uint256 currentRedistribution;
|
||||
|
||||
currentRedistribution = uint256(redistributions[redistributions.length-1]);
|
||||
currentRedistribution &= (~maskRedistributionValue);
|
||||
currentRedistribution |= (totalSupply << shiftRedistributionValue);
|
||||
|
||||
redistributions[redistributions.length-1] = bytes32(currentRedistribution);
|
||||
return true;
|
||||
}
|
||||
|
||||
// Get the demurrage period of the current block number
|
||||
function actualPeriod() public view returns (uint128) {
|
||||
return uint128((block.timestamp - periodStart) / periodDuration + 1);
|
||||
}
|
||||
|
||||
// Add an entered demurrage period to the redistribution array
|
||||
function checkPeriod() private view returns (bytes32) {
|
||||
bytes32 lastRedistribution;
|
||||
uint256 currentPeriod;
|
||||
|
||||
lastRedistribution = redistributions[redistributions.length-1];
|
||||
currentPeriod = this.actualPeriod();
|
||||
if (currentPeriod <= toRedistributionPeriod(lastRedistribution)) {
|
||||
return bytes32(0x00);
|
||||
}
|
||||
return lastRedistribution;
|
||||
}
|
||||
|
||||
// Deserialize the pemurrage period for the given account is participating in
|
||||
function accountPeriod(address _account) public view returns (uint256) {
|
||||
return (uint256(account[_account]) & maskAccountPeriod) >> shiftAccountPeriod;
|
||||
}
|
||||
|
||||
// Save the given demurrage period as the currently participation period for the given address
|
||||
function registerAccountPeriod(address _account, uint256 _period) private returns (bool) {
|
||||
account[_account] &= bytes32(~maskAccountPeriod);
|
||||
account[_account] |= bytes32((_period << shiftAccountPeriod) & maskAccountPeriod);
|
||||
incrementRedistributionParticipants();
|
||||
return true;
|
||||
}
|
||||
|
||||
// Determine whether the unit number is rounded down, rounded up or evenly divides.
|
||||
// Returns 0 if evenly distributed, or the remainder as a positive number
|
||||
// A _numParts value 0 will be interpreted as the value 1
|
||||
function remainder(uint256 _numParts, uint256 _sumWhole) public pure returns (uint256) {
|
||||
uint256 unit;
|
||||
uint256 truncatedResult;
|
||||
|
||||
if (_numParts == 0) { // no division by zero please
|
||||
revert('ERR_NUMPARTS_ZERO');
|
||||
}
|
||||
require(_numParts < _sumWhole); // At least you are never LESS than the sum of your parts. Think about that.
|
||||
|
||||
unit = _sumWhole / _numParts;
|
||||
truncatedResult = unit * _numParts;
|
||||
return _sumWhole - truncatedResult;
|
||||
}
|
||||
|
||||
// Returns the amount sent to the sink address
|
||||
function applyDefaultRedistribution(bytes32 _redistribution) private returns (uint256) {
|
||||
uint256 redistributionSupply;
|
||||
uint256 redistributionPeriod;
|
||||
uint256 unit;
|
||||
uint256 truncatedResult;
|
||||
|
||||
redistributionSupply = toRedistributionSupply(_redistribution);
|
||||
|
||||
unit = (redistributionSupply * taxLevel) / 1000000;
|
||||
truncatedResult = (unit * 1000000) / taxLevel;
|
||||
|
||||
if (truncatedResult < redistributionSupply) {
|
||||
redistributionPeriod = toRedistributionPeriod(_redistribution); // since we reuse period here, can possibly be optimized by passing period instead
|
||||
redistributions[redistributionPeriod-1] &= bytes32(~maskRedistributionParticipants); // just to be safe, zero out all participant count data, in this case there will be only one
|
||||
redistributions[redistributionPeriod-1] |= bytes32(maskRedistributionIsFractional | (1 << shiftRedistributionParticipants));
|
||||
}
|
||||
|
||||
increaseBaseBalance(sinkAddress, unit / ppmDivider);
|
||||
return unit;
|
||||
}
|
||||
|
||||
// sets the remainder bit for the given period and books the remainder to the sink address balance
|
||||
// returns false if no change was made
|
||||
function applyRemainderOnPeriod(uint256 _remainder, uint256 _period) private returns (bool) {
|
||||
uint256 periodSupply;
|
||||
|
||||
if (_remainder == 0) {
|
||||
return false;
|
||||
}
|
||||
|
||||
// TODO: is this needed?
|
||||
redistributions[_period-1] |= bytes32(maskRedistributionIsFractional);
|
||||
|
||||
periodSupply = toRedistributionSupply(redistributions[_period-1]);
|
||||
increaseBaseBalance(sinkAddress, periodSupply - _remainder);
|
||||
return true;
|
||||
}
|
||||
|
||||
|
||||
// Calculate and cache the demurrage value corresponding to the (period of the) time of the method call
|
||||
function applyDemurrage() public returns (bool) {
|
||||
uint128 epochPeriodCount;
|
||||
uint128 periodCount;
|
||||
uint256 lastDemurrageAmount;
|
||||
uint256 newDemurrageAmount;
|
||||
|
||||
epochPeriodCount = actualPeriod();
|
||||
periodCount = epochPeriodCount - demurragePeriod;
|
||||
if (periodCount == 0) {
|
||||
return false;
|
||||
}
|
||||
lastDemurrageAmount = demurrageAmount;
|
||||
demurrageAmount = uint128(decayBy(lastDemurrageAmount, periodCount));
|
||||
demurragePeriod = epochPeriodCount;
|
||||
emit Decayed(epochPeriodCount, periodCount, lastDemurrageAmount, demurrageAmount);
|
||||
return true;
|
||||
}
|
||||
|
||||
// Return timestamp of start of period threshold
|
||||
function getPeriodTimeDelta(uint256 _periodCount) public view returns (uint256) {
|
||||
return periodStart + (_periodCount * periodDuration);
|
||||
}
|
||||
|
||||
// Amount of demurrage cycles inbetween the current timestamp and the given target time
|
||||
function demurrageCycles(uint256 _target) public view returns (uint256) {
|
||||
return (block.timestamp - _target) / 60;
|
||||
}
|
||||
|
||||
// Recalculate the demurrage modifier for the new period
|
||||
function changePeriod() public returns (bool) {
|
||||
bytes32 currentRedistribution;
|
||||
bytes32 nextRedistribution;
|
||||
uint256 currentPeriod;
|
||||
uint256 currentParticipants;
|
||||
uint256 currentRemainder;
|
||||
uint256 currentDemurrageAmount;
|
||||
uint256 nextRedistributionDemurrage;
|
||||
uint256 demurrageCounts;
|
||||
uint256 periodTimestamp;
|
||||
uint256 nextPeriod;
|
||||
|
||||
currentRedistribution = checkPeriod();
|
||||
if (currentRedistribution == bytes32(0x00)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
currentPeriod = toRedistributionPeriod(currentRedistribution);
|
||||
nextPeriod = currentPeriod + 1;
|
||||
periodTimestamp = getPeriodTimeDelta(currentPeriod);
|
||||
|
||||
applyDemurrage();
|
||||
currentDemurrageAmount = demurrageAmount;
|
||||
|
||||
demurrageCounts = demurrageCycles(periodTimestamp);
|
||||
if (demurrageCounts > 0) {
|
||||
nextRedistributionDemurrage = growBy(currentDemurrageAmount, demurrageCounts) / ppmDivider;
|
||||
} else {
|
||||
nextRedistributionDemurrage = currentDemurrageAmount / ppmDivider;
|
||||
}
|
||||
|
||||
nextRedistribution = toRedistribution(0, nextRedistributionDemurrage, totalSupply, nextPeriod);
|
||||
redistributions.push(nextRedistribution);
|
||||
|
||||
//currentParticipants = toRedistributionParticipants(currentRedistribution);
|
||||
//if (currentParticipants == 0) {
|
||||
currentRemainder = applyDefaultRedistribution(currentRedistribution);
|
||||
//} else {
|
||||
// currentRemainder = remainder(currentParticipants, totalSupply); // we can use totalSupply directly because it will always be the same as the recorded supply on the current redistribution
|
||||
// applyRemainderOnPeriod(currentRemainder, currentPeriod);
|
||||
//}
|
||||
emit Period(nextPeriod);
|
||||
return true;
|
||||
}
|
||||
|
||||
// Reverse a value reduced by demurrage by the given period to its original value
|
||||
function growBy(uint256 _value, uint256 _period) public view returns (uint256) {
|
||||
uint256 valueFactor;
|
||||
uint256 truncatedTaxLevel;
|
||||
|
||||
valueFactor = 1000000;
|
||||
truncatedTaxLevel = taxLevel / ppmDivider;
|
||||
|
||||
for (uint256 i = 0; i < _period; i++) {
|
||||
valueFactor = valueFactor + ((valueFactor * truncatedTaxLevel) / 1000000);
|
||||
}
|
||||
return (valueFactor * _value) / 1000000;
|
||||
}
|
||||
|
||||
// Calculate a value reduced by demurrage by the given period
|
||||
// TODO: higher precision if possible
|
||||
function decayBy(uint256 _value, uint256 _period) public view returns (uint256) {
|
||||
uint256 valueFactor;
|
||||
uint256 truncatedTaxLevel;
|
||||
|
||||
valueFactor = 1000000;
|
||||
truncatedTaxLevel = taxLevel / ppmDivider;
|
||||
|
||||
for (uint256 i = 0; i < _period; i++) {
|
||||
valueFactor = valueFactor - ((valueFactor * truncatedTaxLevel) / 1000000);
|
||||
}
|
||||
return (valueFactor * _value) / 1000000;
|
||||
}
|
||||
|
||||
// If the given account is participating in a period and that period has been crossed
|
||||
// THEN increase the base value of the account with its share of the value reduction of the period
|
||||
function applyRedistributionOnAccount(address _account) public returns (bool) {
|
||||
// bytes32 periodRedistribution;
|
||||
// uint256 supply;
|
||||
// uint256 participants;
|
||||
// uint256 baseValue;
|
||||
// uint256 value;
|
||||
uint256 period;
|
||||
// uint256 demurrage;
|
||||
//
|
||||
period = accountPeriod(_account);
|
||||
if (period == 0 || period >= actualPeriod()) {
|
||||
return false;
|
||||
}
|
||||
// periodRedistribution = redistributions[period-1];
|
||||
// participants = toRedistributionParticipants(periodRedistribution);
|
||||
// if (participants == 0) {
|
||||
// return false;
|
||||
// }
|
||||
//
|
||||
// supply = toRedistributionSupply(periodRedistribution);
|
||||
// demurrage = toRedistributionDemurrageModifier(periodRedistribution);
|
||||
// baseValue = ((supply / participants) * (taxLevel / 1000000)) / ppmDivider;
|
||||
// value = (baseValue * demurrage) / 1000000;
|
||||
//
|
||||
// // zero out period for the account
|
||||
account[_account] &= bytes32(~maskAccountPeriod);
|
||||
// increaseBaseBalance(_account, value);
|
||||
//
|
||||
// emit Redistribution(_account, period, value);
|
||||
return true;
|
||||
}
|
||||
|
||||
// Inflates the given amount according to the current demurrage modifier
|
||||
function toBaseAmount(uint256 _value) public view returns (uint256) {
|
||||
//return (_value * ppmDivider * 1000000) / toDemurrageAmount(demurrageModifier);
|
||||
return (_value * ppmDivider * 1000000) / demurrageAmount;
|
||||
}
|
||||
|
||||
// Implements ERC20, triggers tax and/or redistribution
|
||||
function approve(address _spender, uint256 _value) public returns (bool) {
|
||||
uint256 baseValue;
|
||||
|
||||
changePeriod();
|
||||
//applyRedistributionOnAccount(msg.sender);
|
||||
|
||||
baseValue = toBaseAmount(_value);
|
||||
allowance[msg.sender][_spender] += baseValue;
|
||||
emit Approval(msg.sender, _spender, _value);
|
||||
return true;
|
||||
}
|
||||
|
||||
// Implements ERC20, triggers tax and/or redistribution
|
||||
function transfer(address _to, uint256 _value) public returns (bool) {
|
||||
uint256 baseValue;
|
||||
bool result;
|
||||
|
||||
changePeriod();
|
||||
//applyRedistributionOnAccount(msg.sender);
|
||||
|
||||
baseValue = toBaseAmount(_value);
|
||||
result = transferBase(msg.sender, _to, baseValue);
|
||||
emit Transfer(msg.sender, _to, _value);
|
||||
return result;
|
||||
}
|
||||
|
||||
|
||||
// Implements ERC20, triggers tax and/or redistribution
|
||||
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
|
||||
uint256 baseValue;
|
||||
bool result;
|
||||
|
||||
changePeriod();
|
||||
//applyRedistributionOnAccount(msg.sender);
|
||||
|
||||
baseValue = toBaseAmount(_value);
|
||||
require(allowance[_from][msg.sender] >= baseValue);
|
||||
|
||||
result = transferBase(_from, _to, baseValue);
|
||||
emit Transfer(_from, _to, _value);
|
||||
return result;
|
||||
}
|
||||
|
||||
// ERC20 transfer backend for transfer, transferFrom
|
||||
function transferBase(address _from, address _to, uint256 _value) private returns (bool) {
|
||||
uint256 period;
|
||||
|
||||
decreaseBaseBalance(_from, _value);
|
||||
increaseBaseBalance(_to, _value);
|
||||
|
||||
period = actualPeriod();
|
||||
if (_value >= minimumParticipantSpend && accountPeriod(_from) != period && _from != _to) {
|
||||
registerAccountPeriod(_from, period);
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
// Implements EIP173
|
||||
function transferOwnership(address _newOwner) public returns (bool) {
|
||||
require(msg.sender == owner);
|
||||
newOwner = _newOwner;
|
||||
}
|
||||
|
||||
// Implements OwnedAccepter
|
||||
function acceptOwnership() public returns (bool) {
|
||||
address oldOwner;
|
||||
|
||||
require(msg.sender == newOwner);
|
||||
oldOwner = owner;
|
||||
owner = newOwner;
|
||||
newOwner = address(0);
|
||||
emit OwnershipTransferred(oldOwner, owner);
|
||||
}
|
||||
|
||||
// Implements EIP165
|
||||
function supportsInterface(bytes4 _sum) public pure returns (bool) {
|
||||
if (_sum == 0xc6bb4b70) { // ERC20
|
||||
return true;
|
||||
}
|
||||
if (_sum == 0x449a52f8) { // Minter
|
||||
return true;
|
||||
}
|
||||
if (_sum == 0x01ffc9a7) { // EIP165
|
||||
return true;
|
||||
}
|
||||
if (_sum == 0x9493f8b2) { // EIP173
|
||||
return true;
|
||||
}
|
||||
if (_sum == 0x37a47be4) { // OwnedAccepter
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
|
@ -1,16 +1,32 @@
|
|||
SOLC = /usr/bin/solc
|
||||
|
||||
all:
|
||||
all: multi_nocap multi_cap single_nocap
|
||||
|
||||
|
||||
multi_nocap:
|
||||
$(SOLC) DemurrageTokenMultiNocap.sol --abi --evm-version byzantium | awk 'NR>3' > DemurrageTokenMultiNocap.json
|
||||
$(SOLC) DemurrageTokenMultiNocap.sol --bin --evm-version byzantium | awk 'NR>3' > DemurrageTokenMultiNocap.bin
|
||||
truncate -s -1 DemurrageTokenMultiCap.bin
|
||||
|
||||
multi_cap:
|
||||
$(SOLC) DemurrageTokenMultiCap.sol --abi --evm-version byzantium | awk 'NR>3' > DemurrageTokenMultiCap.json
|
||||
$(SOLC) DemurrageTokenMultiCap.sol --bin --evm-version byzantium | awk 'NR>3' > DemurrageTokenMultiCap.bin
|
||||
truncate -s -1 DemurrageTokenMultiNocap.bin
|
||||
|
||||
multi: multi_nocap multi_cap
|
||||
|
||||
single_nocap:
|
||||
$(SOLC) DemurrageTokenSingleNocap.sol --abi --evm-version byzantium | awk 'NR>3' > DemurrageTokenSingleNocap.json
|
||||
$(SOLC) DemurrageTokenSingleNocap.sol --bin --evm-version byzantium | awk 'NR>3' > DemurrageTokenSingleNocap.bin
|
||||
truncate -s -1 DemurrageTokenSingleNocap.bin
|
||||
|
||||
test: all
|
||||
python ../python/tests/test_basic.py
|
||||
python ../python/tests/test_period.py
|
||||
python ../python/tests/test_redistribution.py
|
||||
python ../python/tests/test_pure.py
|
||||
|
||||
install: all
|
||||
cp -v DemurrageTokenMultiNocap.{json,bin} ../python/sarafu_token/data/
|
||||
cp -v DemurrageToken*.{json,bin} ../python/erc20_demurrage_token/data/
|
||||
|
||||
.PHONY: test install
|
||||
|
|
|
|||
Loading…
Reference in New Issue