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14 Commits

27 changed files with 829 additions and 168 deletions

5
CAVEAT Normal file
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@ -0,0 +1,5 @@
The contract is intended for slow rates of decay (e.g. 2% per month). Very high levels of decay (2% per minute) will lead to overflows, and will need a more flexible implementation to support it.
The contract is written with frequent usage in mind. If used for tokens with low usage freqency (e.g. several days idle), it is recommended to run a continuous process triggering the changePeriod() contract call, to reduce the amount of exponential calculation the application of demurrage will trigger.
When changing the period, the supply for the consecutive period will be taken at the time of code execution, and thus not necessarily at the time when the redistribution period threshold was crossed.

8
ROADMAP Normal file
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@ -0,0 +1,8 @@
- 0.1.3
* Snapshot supply for crossed redistribution thresholds before minting new tokens.
- 0.1.4
* Implement natural logarithm
- 0.1.5
* Port changes from SingleNocap to SingleCap
- 0.2.0
* Make decay resolutions configurable, to support high levels of decay.

1
VERSION Normal file
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@ -0,0 +1 @@
0.1.2

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@ -1,3 +1,9 @@
- 0.2.0
* Add token burn function
* Fix gas leak when calculating decay on period change
* Remove all but SingleNocap contract in make install
* Make approve explicitly set value
* Add increaseAllowance and decreaseAllowance methods
- 0.1.1 - 0.1.1
* Settable demurrage steps for apply demurrage cli tool * Settable demurrage steps for apply demurrage cli tool
- 0.1.0 - 0.1.0

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@ -9,8 +9,7 @@ from chainlib.eth.constant import ZERO_ADDRESS
# local imports # local imports
from .token import DemurrageToken from .token import DemurrageToken
logging.basicConfig(level=logging.DEBUG) logg = logging.getLogger(__name__)
logg = logging.getLogger()
class DemurrageCalculator: class DemurrageCalculator:

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@ -16,17 +16,7 @@ import math
# external imports # external imports
import confini import confini
from funga.eth.signer import EIP155Signer import chainlib.eth.cli
from funga.eth.keystore.dict import DictKeystore
from chainlib.chain import ChainSpec
from chainlib.eth.nonce import (
RPCNonceOracle,
OverrideNonceOracle,
)
from chainlib.eth.gas import (
RPCGasOracle,
OverrideGasOracle,
)
from chainlib.eth.block import ( from chainlib.eth.block import (
block_latest, block_latest,
block_by_number, block_by_number,
@ -35,8 +25,20 @@ from chainlib.eth.block import (
from chainlib.eth.connection import EthHTTPConnection from chainlib.eth.connection import EthHTTPConnection
from chainlib.eth.tx import receipt from chainlib.eth.tx import receipt
from chainlib.eth.constant import ZERO_ADDRESS from chainlib.eth.constant import ZERO_ADDRESS
import chainlib.eth.cli
from hexathon import to_int as hex_to_int from hexathon import to_int as hex_to_int
import chainlib.eth.cli
from chainlib.eth.settings import process_settings
from chainlib.settings import ChainSettings
from chainlib.eth.cli.arg import (
Arg,
ArgFlag,
process_args,
)
from chainlib.eth.cli.config import (
Config,
process_config,
)
from chainlib.eth.cli.log import process_log
# local imports # local imports
import erc20_demurrage_token import erc20_demurrage_token
@ -45,32 +47,38 @@ from erc20_demurrage_token import (
DemurrageTokenSettings, DemurrageTokenSettings,
) )
logging.basicConfig(level=logging.WARNING)
logg = logging.getLogger() logg = logging.getLogger()
script_dir = os.path.dirname(__file__)
data_dir = os.path.join(script_dir, '..', 'data')
config_dir = os.path.join(data_dir, 'config') def process_config_local(config, arg, args, flags):
config.add(args.steps, '_STEPS', False)
return config
arg_flags = chainlib.eth.cli.argflag_std_write | chainlib.eth.cli.Flag.EXEC
argparser = chainlib.eth.cli.ArgumentParser(arg_flags) arg_flags = ArgFlag()
arg = Arg(arg_flags)
flags = arg_flags.STD_WRITE | arg_flags.EXEC | arg_flags.WALLET
argparser = chainlib.eth.cli.ArgumentParser()
argparser = process_args(argparser, arg, flags)
argparser.add_argument('--steps', type=int, default=0, help='Max demurrage steps to apply per round') argparser.add_argument('--steps', type=int, default=0, help='Max demurrage steps to apply per round')
args = argparser.parse_args() args = argparser.parse_args()
config = chainlib.eth.cli.Config.from_args(args, arg_flags, default_fee_limit=DemurrageToken.gas(), base_config_dir=config_dir)
config.add(args.steps, '_STEPS', False) logg = process_log(args, logg)
config = Config()
config = process_config(config, arg, args, flags)
config = process_config_local(config, arg, args, flags)
logg.debug('config loaded:\n{}'.format(config)) logg.debug('config loaded:\n{}'.format(config))
wallet = chainlib.eth.cli.Wallet() settings = ChainSettings()
wallet.from_config(config) settings = process_settings(settings, config)
logg.debug('settings loaded:\n{}'.format(settings))
rpc = chainlib.eth.cli.Rpc(wallet=wallet)
conn = rpc.connect_by_config(config)
chain_spec = ChainSpec.from_chain_str(config.get('CHAIN_SPEC'))
def main(): def main():
chain_spec = settings.get('CHAIN_SPEC')
conn = settings.get('CONN')
o = block_latest() o = block_latest()
r = conn.do(o) r = conn.do(o)
@ -87,9 +95,9 @@ def main():
block_start_timestamp = block_start.timestamp block_start_timestamp = block_start.timestamp
block_start_datetime = datetime.datetime.fromtimestamp(block_start_timestamp) block_start_datetime = datetime.datetime.fromtimestamp(block_start_timestamp)
gas_oracle = rpc.get_gas_oracle() gas_oracle = settings.get('FEE_ORACLE')
c = DemurrageToken(chain_spec, gas_oracle=gas_oracle) c = DemurrageToken(chain_spec, gas_oracle=gas_oracle)
o = c.demurrage_timestamp(config.get('_EXEC_ADDRESS')) o = c.demurrage_timestamp(settings.get('EXEC'))
r = conn.do(o) r = conn.do(o)
demurrage_timestamp = None demurrage_timestamp = None
@ -120,17 +128,17 @@ def main():
last_tx_hash = None last_tx_hash = None
for i in range(rounds): for i in range(rounds):
signer = rpc.get_signer() signer = settings.get('SIGNER')
signer_address = rpc.get_sender_address() signer_address = settings.get('SENDER_ADDRESS')
nonce_oracle = rpc.get_nonce_oracle() nonce_oracle = settings.get('NONCE_ORACLE')
c = DemurrageToken(chain_spec, signer=signer, gas_oracle=gas_oracle, nonce_oracle=nonce_oracle) c = DemurrageToken(chain_spec, signer=signer, gas_oracle=gas_oracle, nonce_oracle=nonce_oracle)
(tx_hash_hex, o) = c.apply_demurrage(config.get('_EXEC_ADDRESS'), signer_address, limit=config.get('_STEPS')) (tx_hash_hex, o) = c.apply_demurrage(config.get('_EXEC_ADDRESS'), signer_address, limit=config.get('_STEPS'))
if config.get('_RPC_SEND'): if settings.get('RPC_SEND'):
print(tx_hash_hex) print(tx_hash_hex)
conn.do(o) conn.do(o)
if config.get('_WAIT_ALL') or (i == rounds - 1 and config.get('_WAIT')): if config.true('_WAIT_ALL') or (i == rounds - 1 and config.true('_WAIT')):
r = conn.wait(tx_hash_hex) r = conn.wait(tx_hash_hex)
if r['status'] == 0: if r['status'] == 0:
sys.stderr.write('EVM revert while deploying contract. Wish I had more to tell you') sys.stderr.write('EVM revert while deploying contract. Wish I had more to tell you')

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@ -14,21 +14,22 @@ import logging
# external imports # external imports
import confini import confini
from funga.eth.signer import EIP155Signer
from funga.eth.keystore.dict import DictKeystore
from chainlib.chain import ChainSpec
from chainlib.eth.nonce import (
RPCNonceOracle,
OverrideNonceOracle,
)
from chainlib.eth.gas import (
RPCGasOracle,
OverrideGasOracle,
)
from chainlib.eth.connection import EthHTTPConnection from chainlib.eth.connection import EthHTTPConnection
from chainlib.eth.tx import receipt from chainlib.eth.tx import receipt
from chainlib.eth.constant import ZERO_ADDRESS from chainlib.eth.constant import ZERO_ADDRESS
import chainlib.eth.cli import chainlib.eth.cli
from chainlib.eth.settings import process_settings
from chainlib.settings import ChainSettings
from chainlib.eth.cli.arg import (
Arg,
ArgFlag,
process_args,
)
from chainlib.eth.cli.config import (
Config,
process_config,
)
from chainlib.eth.cli.log import process_log
# local imports # local imports
import erc20_demurrage_token import erc20_demurrage_token
@ -37,84 +38,75 @@ from erc20_demurrage_token import (
DemurrageTokenSettings, DemurrageTokenSettings,
) )
logging.basicConfig(level=logging.WARNING)
logg = logging.getLogger() logg = logging.getLogger()
script_dir = os.path.dirname(__file__)
data_dir = os.path.join(script_dir, '..', 'data')
config_dir = os.path.join(data_dir, 'config') def process_config_local(config, arg, args, flags):
config.add(args.token_name, 'TOKEN_NAME', False)
config.add(args.token_symbol, 'TOKEN_SYMBOL', False)
config.add(args.token_decimals, 'TOKEN_DECIMALS', False)
config.add(args.sink_address, 'TOKEN_SINK_ADDRESS', False)
config.add(args.redistribution_period, 'TOKEN_REDISTRIBUTION_PERIOD', False)
config.add(args.demurrage_level, 'TOKEN_DEMURRAGE_LEVEL', False)
config.add(0, 'TOKEN_SUPPLY_LIMIT', False)
return config
arg_flags = chainlib.eth.cli.argflag_std_write
argparser = chainlib.eth.cli.ArgumentParser(arg_flags) arg_flags = ArgFlag()
arg = Arg(arg_flags)
flags = arg_flags.STD_WRITE | arg_flags.EXEC | arg_flags.WALLET
argparser = chainlib.eth.cli.ArgumentParser()
argparser = process_args(argparser, arg, flags)
argparser.add_argument('--name', dest='token_name', type=str, help='Token name') argparser.add_argument('--name', dest='token_name', type=str, help='Token name')
argparser.add_argument('--symbol', dest='token_symbol', required=True, type=str, help='Token symbol') argparser.add_argument('--symbol', dest='token_symbol', required=True, type=str, help='Token symbol')
argparser.add_argument('--decimals', dest='token_decimals', type=int, help='Token decimals') argparser.add_argument('--decimals', dest='token_decimals', type=int, help='Token decimals')
argparser.add_argument('--sink-address', dest='sink_address', type=str, help='demurrage level,ppm per minute') argparser.add_argument('--sink-address', dest='sink_address', type=str, help='demurrage level,ppm per minute')
argparser.add_argument('--supply-limit', dest='supply_limit', type=int, help='token supply limit (0 = no limit)') #argparser.add_argument('--supply-limit', dest='supply_limit', type=int, help='token supply limit (0 = no limit)')
argparser.add_argument('--redistribution-period', type=int, help='redistribution period, minutes (0 = deactivate)') # default 10080 = week argparser.add_argument('--redistribution-period', dest='redistribution_period', type=int, help='redistribution period, minutes (0 = deactivate)') # default 10080 = week
argparser.add_argument('--multi', action='store_true', help='automatic redistribution') #argparser.add_argument('--multi', action='store_true', help='automatic redistribution')
argparser.add_argument('--demurrage-level', dest='demurrage_level', type=int, help='demurrage level, ppm per minute') argparser.add_argument('--demurrage-level', dest='demurrage_level', type=int, help='demurrage level, ppm per minute')
args = argparser.parse_args() args = argparser.parse_args()
arg_flags = chainlib.eth.cli.argflag_std_write logg = process_log(args, logg)
extra_args = { config = Config()
'redistribution_period': 'TOKEN_REDISTRIBUTION_PERIOD', config = process_config(config, arg, args, flags)
'demurrage_level': 'TOKEN_DEMURRAGE_LEVEL', config = process_config_local(config, arg, args, flags)
'supply_limit': 'TOKEN_SUPPLY_LIMIT',
'token_name': 'TOKEN_NAME',
'token_symbol': 'TOKEN_SYMBOL',
'token_decimals': 'TOKEN_DECIMALS',
'sink_address': 'TOKEN_SINK_ADDRESS',
'multi': None,
}
config = chainlib.eth.cli.Config.from_args(args, arg_flags, extra_args=extra_args, default_fee_limit=DemurrageToken.gas(), base_config_dir=config_dir)
if not bool(config.get('TOKEN_NAME')):
logg.info('token name not set, using symbol {} as name'.format(config.get('TOKEN_SYMBOL')))
config.add(config.get('TOKEN_SYMBOL'), 'TOKEN_NAME', True)
if config.get('TOKEN_SUPPLY_LIMIT') == None:
config.add(0, 'TOKEN_SUPPLY_LIMIT', True)
if config.get('TOKEN_REDISTRIBUTION_PERIOD') == None:
config.add(10800, 'TOKEN_REDISTRIBUTION_PERIOD', True)
logg.debug('config loaded:\n{}'.format(config)) logg.debug('config loaded:\n{}'.format(config))
wallet = chainlib.eth.cli.Wallet() settings = ChainSettings()
wallet.from_config(config) settings = process_settings(settings, config)
logg.debug('settings loaded:\n{}'.format(settings))
rpc = chainlib.eth.cli.Rpc(wallet=wallet)
conn = rpc.connect_by_config(config)
chain_spec = ChainSpec.from_chain_str(config.get('CHAIN_SPEC'))
def main(): def main():
signer = rpc.get_signer() chain_spec = settings.get('CHAIN_SPEC')
signer_address = rpc.get_sender_address() conn = settings.get('CONN')
signer = settings.get('SIGNER')
signer_address = settings.get('SENDER_ADDRESS')
gas_oracle = rpc.get_gas_oracle() gas_oracle = settings.get('FEE_ORACLE')
nonce_oracle = rpc.get_nonce_oracle() nonce_oracle = settings.get('NONCE_ORACLE')
c = DemurrageToken(chain_spec, signer=signer, gas_oracle=gas_oracle, nonce_oracle=nonce_oracle) c = DemurrageToken(chain_spec, signer=signer, gas_oracle=gas_oracle, nonce_oracle=nonce_oracle)
settings = DemurrageTokenSettings() token_settings = DemurrageTokenSettings()
settings.name = config.get('TOKEN_NAME') token_settings.name = config.get('TOKEN_NAME')
settings.symbol = config.get('TOKEN_SYMBOL') token_settings.symbol = config.get('TOKEN_SYMBOL')
settings.decimals = int(config.get('TOKEN_DECIMALS')) token_settings.decimals = int(config.get('TOKEN_DECIMALS'))
settings.demurrage_level = int(config.get('TOKEN_DEMURRAGE_LEVEL')) token_settings.demurrage_level = int(config.get('TOKEN_DEMURRAGE_LEVEL'))
settings.period_minutes = int(config.get('TOKEN_REDISTRIBUTION_PERIOD')) token_settings.period_minutes = int(config.get('TOKEN_REDISTRIBUTION_PERIOD'))
settings.sink_address = config.get('TOKEN_SINK_ADDRESS') token_settings.sink_address = config.get('TOKEN_SINK_ADDRESS')
(tx_hash_hex, o) = c.constructor( (tx_hash_hex, o) = c.constructor(
signer_address, signer_address,
settings, token_settings,
redistribute=config.true('_MULTI'), redistribute=config.true('_MULTI'),
cap=int(config.get('TOKEN_SUPPLY_LIMIT')), cap=int(config.get('TOKEN_SUPPLY_LIMIT')),
) )
if config.get('_RPC_SEND'): if settings.get('RPC_SEND'):
conn.do(o) conn.do(o)
if config.get('_WAIT'): if config.true('_WAIT'):
r = conn.wait(tx_hash_hex) r = conn.wait(tx_hash_hex)
if r['status'] == 0: if r['status'] == 0:
sys.stderr.write('EVM revert while deploying contract. Wish I had more to tell you') sys.stderr.write('EVM revert while deploying contract. Wish I had more to tell you')

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@ -117,6 +117,34 @@ class DemurrageToken(ERC20):
return DemurrageToken.__bytecode[name] return DemurrageToken.__bytecode[name]
def increase_allowance(self, contract_address, sender_address, address, value, tx_format=TxFormat.JSONRPC):
enc = ABIContractEncoder()
enc.method('increaseAllowance')
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
def decrease_allowance(self, contract_address, sender_address, address, value, tx_format=TxFormat.JSONRPC):
enc = ABIContractEncoder()
enc.method('decreaseAllowance')
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
def add_minter(self, contract_address, sender_address, address, tx_format=TxFormat.JSONRPC): def add_minter(self, contract_address, sender_address, address, tx_format=TxFormat.JSONRPC):
enc = ABIContractEncoder() enc = ABIContractEncoder()
enc.method('addMinter') enc.method('addMinter')
@ -155,6 +183,33 @@ class DemurrageToken(ERC20):
return tx return tx
def burn(self, contract_address, sender_address, value, tx_format=TxFormat.JSONRPC):
enc = ABIContractEncoder()
enc.method('burn')
enc.typ(ABIContractType.UINT256)
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
def total_burned(self, contract_address, sender_address=ZERO_ADDRESS, id_generator=None):
j = JSONRPCRequest(id_generator)
o = j.template()
o['method'] = 'eth_call'
enc = ABIContractEncoder()
enc.method('totalBurned')
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')
o = j.finalize(o)
return o
def to_base_amount(self, contract_address, value, sender_address=ZERO_ADDRESS, id_generator=None): def to_base_amount(self, contract_address, value, sender_address=ZERO_ADDRESS, id_generator=None):
j = JSONRPCRequest(id_generator) j = JSONRPCRequest(id_generator)
o = j.template() o = j.template()
@ -526,6 +581,7 @@ class DemurrageToken(ERC20):
def parse_supply_cap(self, v): def parse_supply_cap(self, v):
return abi_decode_single(ABIContractType.UINT256, v) return abi_decode_single(ABIContractType.UINT256, v)
@classmethod @classmethod
def parse_grow_by(self, v): def parse_grow_by(self, v):
return abi_decode_single(ABIContractType.UINT256, v) return abi_decode_single(ABIContractType.UINT256, v)
@ -549,3 +605,8 @@ class DemurrageToken(ERC20):
@classmethod @classmethod
def parse_resolution_factor(self, v): def parse_resolution_factor(self, v):
return abi_decode_single(ABIContractType.UINT256, v) return abi_decode_single(ABIContractType.UINT256, v)
@classmethod
def parse_total_burned(self, v):
return abi_decode_single(ABIContractType.UINT256, v)

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@ -20,7 +20,7 @@ from erc20_demurrage_token import (
DemurrageToken, DemurrageToken,
) )
logg = logging.getLogger() logg = logging.getLogger(__name__)
#BLOCKTIME = 5 # seconds #BLOCKTIME = 5 # seconds
TAX_LEVEL = int(10000 * 2) # 2% TAX_LEVEL = int(10000 * 2) # 2%
@ -95,13 +95,6 @@ class TestDemurrage(EthTesterCase):
def setUp(self): def setUp(self):
super(TestDemurrage, self).setUp() super(TestDemurrage, self).setUp()
# token_deploy = TestTokenDeploy()
# self.settings = token_deploy.settings
# self.sink_address = token_deploy.sink_address
# self.start_block = token_deploy.start_block
# self.start_time = token_deploy.start_time
# self.default_supply = self.default_supply
# self.default_supply_cap = self.default_supply_cap
period = PERIOD period = PERIOD
try: try:
period = getattr(self, 'period') period = getattr(self, 'period')
@ -133,6 +126,13 @@ class TestDemurrage(EthTesterCase):
logg.debug('asserted within lower {} <= {} <= {}'.format(lower_target, v, target)) logg.debug('asserted within lower {} <= {} <= {}'.format(lower_target, v, target))
def assert_within_greater(self, v, target, tolerance_ppm):
higher_target = target + (target * (tolerance_ppm / 1000000))
self.assertLessEqual(v, higher_target)
self.assertGreaterEqual(v, target)
logg.debug('asserted within lower {} <= {} <= {}'.format(target, v, higher_target))
def tearDown(self): def tearDown(self):
pass pass

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@ -1,3 +1,3 @@
chainlib-eth>=0.1.0,<0.2.0 chainlib-eth~=0.4.6
eth-erc20~=0.3.0 eth-erc20~=0.5.1
funga-eth~=0.6.0 funga-eth~=0.6.0

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@ -6,15 +6,18 @@ set -e
export PYTHONPATH=. export PYTHONPATH=.
#modes=(MultiNocap MultiCap SingleCap SingleNocap) #modes=(MultiNocap MultiCap SingleCap SingleNocap)
modes=(SingleCap SingleNocap) # other contracts need to be updted #modes=(SingleCap SingleNocap) # other contracts need to be updted
modes=(SingleNocap) # other contracts need to be updted
for m in ${modes[@]}; do for m in ${modes[@]}; do
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_basic.py ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_basic.py
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_growth.py ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_growth.py
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_amounts.py ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_amounts.py
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_single.py ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_single.py
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_burn.py
done done
modes=(SingleCap) # other contracts need to be updted #modes=(SingleCap) # other contracts need to be updted
modes=()
for m in ${modes[@]}; do for m in ${modes[@]}; do
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_period.py ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_period.py
done done
@ -25,7 +28,8 @@ for m in ${modes[@]}; do
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_redistribution_single.py ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_redistribution_single.py
done done
modes=(MultiCap SingleCap) #modes=(MultiCap SingleCap)
modes=()
for m in ${modes[@]}; do for m in ${modes[@]}; do
ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_cap.py ERC20_DEMURRAGE_TOKEN_TEST_MODE=$m python tests/test_cap.py
done done

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@ -1,6 +1,6 @@
[metadata] [metadata]
name = erc20-demurrage-token name = erc20-demurrage-token
version = 0.1.1 version = 0.2.0
description = ERC20 token with redistributed continual demurrage description = ERC20 token with redistributed continual demurrage
author = Louis Holbrook author = Louis Holbrook
author_email = dev@holbrook.no author_email = dev@holbrook.no

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@ -276,7 +276,52 @@ class TestBasic(TestDemurrageDefault):
r = self.rpc.do(o) r = self.rpc.do(o)
self.assertEqual(r['status'], 1) self.assertEqual(r['status'], 1)
def test_approve(self):
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.approve(self.address, self.accounts[0], self.accounts[1], 500)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
(tx_hash, o) = c.approve(self.address, self.accounts[0], self.accounts[1], 600)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 0)
(tx_hash, o) = c.approve(self.address, self.accounts[0], self.accounts[1], 0)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
(tx_hash, o) = c.approve(self.address, self.accounts[0], self.accounts[1], 600)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
(tx_hash, o) = c.increase_allowance(self.address, self.accounts[0], self.accounts[1], 200)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
(tx_hash, o) = c.decrease_allowance(self.address, self.accounts[0], self.accounts[1], 800)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
(tx_hash, o) = c.approve(self.address, self.accounts[0], self.accounts[1], 42)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
def test_transfer_from(self): def test_transfer_from(self):
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc) nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
@ -315,6 +360,12 @@ class TestBasic(TestDemurrageDefault):
balance = c.parse_balance_of(r) balance = c.parse_balance_of(r)
self.assertEqual(balance, 500) self.assertEqual(balance, 500)
(tx_hash, o) = c.transfer_from(self.address, self.accounts[2], self.accounts[1], self.accounts[3], 1)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 0)
if __name__ == '__main__': if __name__ == '__main__':
unittest.main() unittest.main()

320
python/tests/test_burn.py Normal file
View File

@ -0,0 +1,320 @@
# standard imports
import os
import unittest
import json
import logging
import datetime
# external imports
from chainlib.eth.constant import ZERO_ADDRESS
from chainlib.eth.nonce import RPCNonceOracle
from chainlib.eth.tx import receipt
from chainlib.eth.block import (
block_latest,
block_by_number,
)
# local imports
from erc20_demurrage_token import DemurrageToken
# test imports
from erc20_demurrage_token.unittest.base import TestDemurrage
logging.basicConfig(level=logging.INFO)
logg = logging.getLogger()
testdir = os.path.dirname(__file__)
TAX_LEVEL = 2
class TestBurn(TestDemurrage):
def setUp(self):
super(TestBurn, self).setUp()
def deploy(self, tax_level=None):
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
self.mode = os.environ.get('ERC20_DEMURRAGE_TOKEN_TEST_MODE')
if self.mode == None:
self.mode = 'MultiNocap'
logg.debug('executing test setup default mode {}'.format(self.mode))
if tax_level != None:
self.deployer.settings.demurrage_level = tax_level * (10 ** 32)
self.deployer.settings.sink_address = self.accounts[9]
self.deployer.sink_address = self.accounts[9]
super(TestBurn, self).deploy(c, self.mode)
logg.info('deployed with mode {}'.format(self.mode))
# Burn tokens and immediately check balances and supply
def test_burn_basic(self):
self.deploy()
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[1], 1000000)
r = self.rpc.do(o)
nonce_oracle = RPCNonceOracle(self.accounts[1], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.burn(self.address, self.accounts[1], 600000)
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 0)
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.add_minter(self.address, self.accounts[0], self.accounts[1])
r = self.rpc.do(o)
nonce_oracle = RPCNonceOracle(self.accounts[1], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.burn(self.address, self.accounts[1], 600000)
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
self.assertEqual(new_supply, 400000)
o = c.total_burned(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
burned = c.parse_total_burned(r)
self.assertEqual(burned, 600000)
# burn tokens and check sink balance and supply after first redistribution period
def test_burned_redistribution(self):
self.deploy()
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[0], 1000000000)
r = self.rpc.do(o)
(tx_hash, o) = c.burn(self.address, self.accounts[0], 500000000)
r = self.rpc.do(o)
(tx_hash, o) = c.transfer(self.address, self.accounts[0], self.sink_address, 500000000)
r = self.rpc.do(o)
self.backend.time_travel(self.start_time + self.period_seconds)
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
bal = c.parse_balance(r)
self.assertEqual(bal, 416873881) # 9 periods demurrage
(tx_hash, o) = c.change_period(self.address, self.accounts[0])
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
self.assertEqual(new_supply, 500000000)
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
bal = c.parse_balance(r)
self.assert_within_lower(bal, 500000000, 0.0025)
self.backend.time_travel(self.start_time + (self.period_seconds * 2))
(tx_hash, o) = c.change_period(self.address, self.accounts[0])
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
self.assertEqual(new_supply, 500000000)
# if we don't burn anything more it should be the same
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
bal = c.parse_balance(r)
self.assert_within_lower(bal, 500000000, 0.0025)
# burn tokens and check sink and taxed balance and supply after first redistribution period
def test_burned_other_redistribution(self):
self.deploy()
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[0], 1000000000)
r = self.rpc.do(o)
(tx_hash, o) = c.burn(self.address, self.accounts[0], 500000000)
r = self.rpc.do(o)
(tx_hash, o) = c.transfer(self.address, self.accounts[0], self.accounts[1], 500000000)
r = self.rpc.do(o)
self.backend.time_travel(self.start_time + self.period_seconds)
o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
bal = c.parse_balance(r)
self.assertEqual(bal, 416873881) # 9 periods demurrage
(tx_hash, o) = c.change_period(self.address, self.accounts[0])
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
self.assertEqual(new_supply, 500000000)
o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
bal = c.parse_balance(r)
self.assertEqual(bal, 408536403) # 9 periods demurrage
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
sink_bal = c.parse_balance(r)
self.assert_within_lower(sink_bal, 500000000 - 408536403, 0.09) # TODO is this ok variance, 1.0 is ppm?
self.backend.time_travel(self.start_time + (self.period_seconds * 2))
(tx_hash, o) = c.change_period(self.address, self.accounts[0])
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
self.assertEqual(new_supply, 500000000)
o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
next_bal = c.parse_balance(r)
self.assertEqual(next_bal, 333803985) # 9 periods demurrage
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
prev_sink_bal = sink_bal
bal = prev_sink_bal + (bal - next_bal)
sink_bal = c.parse_balance(r)
self.assert_within_lower(sink_bal, bal, 0.09) # TODO is this ok variance, 1.0 is ppm?
# verify expected results of balance and supply after multiple redistribution periods
def test_burn_accumulate(self):
self.deploy(tax_level=2/1000)
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.add_minter(self.address, self.accounts[0], self.sink_address)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.sink_address, self.default_supply)
r = self.rpc.do(o)
balance_share = int(self.default_supply / 2)
nonce_oracle = RPCNonceOracle(self.sink_address, self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.transfer(self.address, self.sink_address, self.accounts[1], balance_share)
r = self.rpc.do(o)
new_supply = None
burn_rate = 1000
sink_bal = None
bob_bal = None
bob_refund = None
o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
bob_bal = c.parse_balance(r)
prev_bob_bal = bob_bal
iterations = 100
for i in range(1, iterations + 1):
nonce_oracle = RPCNonceOracle(self.sink_address, self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
if bob_refund != None:
(tx_hash, o) = c.transfer(self.address, self.sink_address, self.accounts[1], bob_refund)
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
(tx_hash, o) = c.burn(self.address, self.sink_address, burn_rate)
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
self.backend.time_travel(self.start_time + (self.period_seconds * i))
(tx_hash, o) = c.change_period(self.address, self.accounts[0])
self.rpc.do(o)
o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
bob_bal = c.parse_balance(r)
bob_refund = prev_bob_bal - bob_bal
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
burner_bal = c.parse_balance(r)
sum_supply = bob_bal + burner_bal
o = c.total_burned(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
total_burned = c.parse_balance(r)
o = c.to_base_amount(self.address, total_burned, sender_address=self.accounts[0])
r = self.rpc.do(o)
total_burned_base = c.parse_balance(r)
expected_supply = self.default_supply - (burn_rate * i)
logg.info('checking burn round {} balance burner {} bob {} supply {} expected {} summed {} burned {} base {}'.format(i, burner_bal, bob_bal, new_supply, expected_supply, sum_supply, total_burned, total_burned_base))
self.assertEqual(new_supply, expected_supply)
sum_supply = burner_bal + bob_bal
logg.debug('balances sink {} bob {} total {} supply real {} original {}'.format(sink_bal, bob_bal, sum_supply, new_supply, self.default_supply))
self.assert_within_lower(sum_supply, new_supply, 0.00001)
self.assert_within_greater(burner_bal, balance_share - total_burned, 0.1)
bob_delta = self.default_supply * ((2 / 1000000) / 1000)
self.assert_within_lower(bob_bal, balance_share - bob_delta, 0.1)
self.assertEqual(total_burned, iterations * burn_rate)
if __name__ == '__main__':
unittest.main()

View File

@ -0,0 +1,133 @@
# standard imports
import datetime
import unittest
import logging
import os
# external imports
from chainlib.eth.nonce import RPCNonceOracle
from chainlib.eth.tx import receipt
# local imports
from erc20_demurrage_token import DemurrageToken
from erc20_demurrage_token.demurrage import DemurrageCalculator
# test imports
from erc20_demurrage_token.unittest.base import TestDemurrage
logging.basicConfig(level=logging.INFO)
logg = logging.getLogger()
class TestDemurragePeriods(TestDemurrage):
def setUp(self):
super(TestDemurragePeriods, self).setUp()
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
self.mode = os.environ.get('ERC20_DEMURRAGE_TOKEN_TEST_MODE')
if self.mode == None:
self.mode = 'MultiNocap'
logg.debug('executing test setup default mode {}'.format(self.mode))
self.deployer.settings.demurrage_level = (2 / 1000) * (10 ** 32)
self.deployer.settings.sink_address = self.accounts[9]
self.deployer.sink_address = self.accounts[9]
self.deploy(c, self.mode)
logg.info('deployed with mode {}'.format(self.mode))
# verify that tax level calculation is in ppm as expected
def test_ppm(self):
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[1], self.default_supply)
r = self.rpc.do(o)
self.backend.time_travel(self.start_time + 60)
(tx_hash, o) = c.apply_demurrage(self.address, self.accounts[0])
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
bob_bal = c.parse_balance(r)
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
sink_bal = c.parse_balance(r)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
balance_delta = self.default_supply * ((2 / 1000000) / 1000)
self.assertEqual(bob_bal, self.default_supply - balance_delta)
# verify balances and supply after multiple demurrage periods
def test_over_time(self):
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[1], self.default_supply)
r = self.rpc.do(o)
o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
bob_bal = c.parse_balance(r)
prev_bob_bal = bob_bal
nonce_oracle = RPCNonceOracle(self.sink_address, self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
iterations = 100
for i in range(1, iterations + 1):
self.backend.time_travel(self.start_time + (self.period_seconds * i))
(tx_hash, o) = c.transfer(self.address, self.sink_address, self.accounts[1], prev_bob_bal - bob_bal)
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
(tx_hash, o) = c.apply_demurrage(self.address, self.sink_address)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
bob_bal = c.parse_balance(r)
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
sink_bal = c.parse_balance(r)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
logg.info('round {} supply {} balance sink {} bob {}'.format(i, new_supply, sink_bal, bob_bal))
sum_supply = sink_bal + bob_bal
bob_delta = self.default_supply * ((2 / 1000000) / 100)
self.assert_within_lower(sum_supply, new_supply, 0.00001)
self.assert_within_greater(bob_bal, self.default_supply - bob_delta, 0.001)
self.assert_within_lower(sink_bal, bob_delta, 1000)
if __name__ == '__main__':
unittest.main()

View File

@ -28,23 +28,23 @@ testdir = os.path.dirname(__file__)
class TestGrowth(TestDemurrageDefault): class TestGrowth(TestDemurrageDefault):
def test_grow_by(self): # def test_grow_by(self):
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc) # nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) # c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
#
growth_factor = (1000000 + self.tax_level) / 1000000 # growth_factor = (1000000 + self.tax_level) / 1000000
v = 1000000000 # v = 1000000000
o = c.grow_by(self.address, v, 1, sender_address=self.accounts[0]) # o = c.grow_by(self.address, v, 1, sender_address=self.accounts[0])
r = self.rpc.do(o) # r = self.rpc.do(o)
g = c.parse_grow_by(r) # g = c.parse_grow_by(r)
self.assertEqual(int(v * growth_factor), g) # self.assertEqual(int(v * growth_factor), g)
#
period = 10 # period = 10
growth_factor = (1 + (self.tax_level) / 1000000) ** period # growth_factor = (1 + (self.tax_level) / 1000000) ** period
o = c.grow_by(self.address, v, period, sender_address=self.accounts[0]) # o = c.grow_by(self.address, v, period, sender_address=self.accounts[0])
r = self.rpc.do(o) # r = self.rpc.do(o)
g = c.parse_grow_by(r) # g = c.parse_grow_by(r)
self.assertEqual(int(v * growth_factor), g) # self.assertEqual(int(v * growth_factor), g)
def test_decay_by(self): def test_decay_by(self):
@ -63,7 +63,7 @@ class TestGrowth(TestDemurrageDefault):
o = c.decay_by(self.address, v, period, sender_address=self.accounts[0]) o = c.decay_by(self.address, v, period, sender_address=self.accounts[0])
r = self.rpc.do(o) r = self.rpc.do(o)
g = c.parse_decay_by(r) g = c.parse_decay_by(r)
self.assertEqual(int(v * growth_factor), g) self.assertEqual(int(v * growth_factor), g)
if __name__ == '__main__': if __name__ == '__main__':

View File

@ -24,7 +24,7 @@ from erc20_demurrage_token import DemurrageToken
# test imports # test imports
from erc20_demurrage_token.unittest.base import TestDemurrageDefault from erc20_demurrage_token.unittest.base import TestDemurrageDefault
logging.basicConfig(level=logging.DEBUG) logging.basicConfig(level=logging.INFO)
logg = logging.getLogger() logg = logging.getLogger()
testdir = os.path.dirname(__file__) testdir = os.path.dirname(__file__)
@ -88,18 +88,31 @@ class TestRedistribution(TestDemurrageDefault):
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[0], supply) (tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[0], supply)
self.rpc.do(o) self.rpc.do(o)
self.backend.time_travel(self.start_time + (self.period_seconds * 10)) self.backend.time_travel(self.start_time + (self.period_seconds * 100))
for i in range(1, 11): balance_minter = None
logg.debug('checking period {}'.format(i)) balance_sink = None
real_supply = None
for i in range(1, 101):
(tx_hash, o) = c.change_period(self.address, self.accounts[0]) (tx_hash, o) = c.change_period(self.address, self.accounts[0])
self.rpc.do(o) self.rpc.do(o)
o = receipt(tx_hash) o = receipt(tx_hash)
r = self.rpc.do(o) r = self.rpc.do(o)
self.assertEqual(r['status'], 1) self.assertEqual(r['status'], 1)
i = 10 o = c.balance_of(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
balance_sink = c.parse_balance(r)
o = c.balance_of(self.address, self.accounts[0], sender_address=self.accounts[0])
r = self.rpc.do(o)
balance_minter = c.parse_balance(r)
real_supply = balance_sink + balance_minter
logg.info('period {} testing sink {} mint {} adds up to supply {} of original {} (delta {})'.format(i, balance_sink, balance_minter, real_supply, supply, supply - real_supply))
i = 100
o = c.redistributions(self.address, i, sender_address=self.accounts[0]) o = c.redistributions(self.address, i, sender_address=self.accounts[0])
redistribution = self.rpc.do(o) redistribution = self.rpc.do(o)
@ -122,7 +135,7 @@ class TestRedistribution(TestDemurrageDefault):
r = self.rpc.do(o) r = self.rpc.do(o)
balance_minter = c.parse_balance(r) balance_minter = c.parse_balance(r)
logg.debug('testing sink {} mint {} adds up to supply {} with demurrage between {} and {}'.format(balance_sink, balance_minter, supply, demurrage_previous, demurrage)) logg.debug('testing sink {} mint {} adds up to supply {} with demurrage between {} and {}'.format(balance_sink, balance_minter, real_supply, demurrage_previous, demurrage))
self.assert_within_lower(balance_minter + balance_sink, supply, 0.001) self.assert_within_lower(balance_minter + balance_sink, supply, 0.001)

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@ -1,7 +1,6 @@
pragma solidity > 0.6.11; pragma solidity >= 0.8.0;
// SPDX-License-Identifier: GPL-3.0-or-later // SPDX-License-Identifier: GPL-3.0-or-later
contract DemurrageTokenSingleCap { contract DemurrageTokenSingleCap {
// Redistribution bit field, with associated shifts and masks // Redistribution bit field, with associated shifts and masks
@ -12,7 +11,7 @@ contract DemurrageTokenSingleCap {
uint8 constant shiftRedistributionValue = 32; uint8 constant shiftRedistributionValue = 32;
uint256 constant maskRedistributionValue = 0x00000000000000000000000000000000000000ffffffffffffffffff00000000; // ((1 << 72) - 1) << 32 uint256 constant maskRedistributionValue = 0x00000000000000000000000000000000000000ffffffffffffffffff00000000; // ((1 << 72) - 1) << 32
uint8 constant shiftRedistributionDemurrage = 104; uint8 constant shiftRedistributionDemurrage = 104;
uint256 constant maskRedistributionDemurrage = 0x0000000000ffffffffffffffffffffffffffff00000000000000000000000000; // ((1 << 20) - 1) << 140 uint256 constant maskRedistributionDemurrage = 0x0000000000ffffffffffffffffffffffffffff00000000000000000000000000; // ((1 << 36) - 1) << 140
// Account balances // Account balances
mapping (address => uint256) account; mapping (address => uint256) account;
@ -38,7 +37,8 @@ contract DemurrageTokenSingleCap {
uint256 public decimals; uint256 public decimals;
// Implements ERC20 // Implements ERC20
uint256 public totalSupply; //uint256 public totalSupply;
uint256 supply;
// Last executed period // Last executed period
uint256 public lastPeriod; uint256 public lastPeriod;
@ -46,6 +46,9 @@ contract DemurrageTokenSingleCap {
// Last sink redistribution amount // Last sink redistribution amount
uint256 public totalSink; uint256 public totalSink;
// Value of burnt tokens (burnt tokens do not decay)
uint256 public burned;
// 128 bit resolution of the demurrage divisor // 128 bit resolution of the demurrage divisor
// (this constant x 1000000 is contained within 128 bits) // (this constant x 1000000 is contained within 128 bits)
uint256 constant nanoDivider = 100000000000000000000000000; // now nanodivider, 6 zeros less uint256 constant nanoDivider = 100000000000000000000000000; // now nanodivider, 6 zeros less
@ -95,6 +98,9 @@ contract DemurrageTokenSingleCap {
// Temporary event used in development, will be removed on prod // Temporary event used in development, will be removed on prod
event Debug(bytes32 _foo); event Debug(bytes32 _foo);
// Emitted when tokens are burned
event Burn(address indexed _burner, uint256 _value);
// EIP173 // EIP173
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); // EIP173 event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); // EIP173
@ -206,7 +212,7 @@ contract DemurrageTokenSingleCap {
changePeriod(); changePeriod();
baseAmount = toBaseAmount(_amount); baseAmount = toBaseAmount(_amount);
totalSupply += _amount; supply += _amount;
increaseBaseBalance(_beneficiary, baseAmount); increaseBaseBalance(_beneficiary, baseAmount);
emit Mint(msg.sender, _beneficiary, _amount); emit Mint(msg.sender, _beneficiary, _amount);
saveRedistributionSupply(); saveRedistributionSupply();
@ -249,7 +255,7 @@ contract DemurrageTokenSingleCap {
uint256 currentRedistribution; uint256 currentRedistribution;
uint256 grownSupply; uint256 grownSupply;
grownSupply = totalSupply; grownSupply = totalSupply();
currentRedistribution = uint256(redistributions[redistributions.length-1]); currentRedistribution = uint256(redistributions[redistributions.length-1]);
currentRedistribution &= (~maskRedistributionValue); currentRedistribution &= (~maskRedistributionValue);
currentRedistribution |= (grownSupply << shiftRedistributionValue); currentRedistribution |= (grownSupply << shiftRedistributionValue);
@ -263,7 +269,7 @@ contract DemurrageTokenSingleCap {
return uint128((block.timestamp - periodStart) / periodDuration + 1); return uint128((block.timestamp - periodStart) / periodDuration + 1);
} }
// Add an entered demurrage period to the redistribution array // Retrieve next redistribution if the period threshold has been crossed
function checkPeriod() private view returns (bytes32) { function checkPeriod() private view returns (bytes32) {
bytes32 lastRedistribution; bytes32 lastRedistribution;
uint256 currentPeriod; uint256 currentPeriod;
@ -349,14 +355,15 @@ contract DemurrageTokenSingleCap {
} }
// Recalculate the demurrage modifier for the new period // Recalculate the demurrage modifier for the new period
// Note that the supply for the consecutive period will be taken at the time of code execution, and thus not necessarily at the time when the redistribution period threshold was crossed.
function changePeriod() public returns (bool) { function changePeriod() public returns (bool) {
bytes32 currentRedistribution; bytes32 currentRedistribution;
bytes32 nextRedistribution; bytes32 nextRedistribution;
uint256 currentPeriod; uint256 currentPeriod;
uint256 currentDemurrageAmount; uint256 lastDemurrageAmount;
bytes32 lastRedistribution;
uint256 nextRedistributionDemurrage; uint256 nextRedistributionDemurrage;
uint256 demurrageCounts; uint256 demurrageCounts;
uint256 periodTimestamp;
uint256 nextPeriod; uint256 nextPeriod;
applyDemurrage(); applyDemurrage();
@ -365,20 +372,15 @@ contract DemurrageTokenSingleCap {
return false; return false;
} }
// calculate the decay from previous redistributino
lastRedistribution = redistributions[lastPeriod];
currentPeriod = toRedistributionPeriod(currentRedistribution); currentPeriod = toRedistributionPeriod(currentRedistribution);
nextPeriod = currentPeriod + 1; nextPeriod = currentPeriod + 1;
periodTimestamp = getPeriodTimeDelta(currentPeriod); lastDemurrageAmount = toRedistributionDemurrageModifier(lastRedistribution);
demurrageCounts = periodDuration / 60;
currentDemurrageAmount = demurrageAmount; nextRedistributionDemurrage = decayBy(lastDemurrageAmount, demurrageCounts);
demurrageCounts = demurrageCycles(periodTimestamp); nextRedistribution = toRedistribution(0, nextRedistributionDemurrage, totalSupply(), nextPeriod);
if (demurrageCounts > 0) {
nextRedistributionDemurrage = growBy(currentDemurrageAmount, demurrageCounts);
} else {
nextRedistributionDemurrage = currentDemurrageAmount;
}
nextRedistribution = toRedistribution(0, nextRedistributionDemurrage, totalSupply, nextPeriod);
redistributions.push(nextRedistribution); redistributions.push(nextRedistribution);
applyDefaultRedistribution(nextRedistribution); applyDefaultRedistribution(nextRedistribution);
@ -423,14 +425,45 @@ contract DemurrageTokenSingleCap {
function approve(address _spender, uint256 _value) public returns (bool) { function approve(address _spender, uint256 _value) public returns (bool) {
uint256 baseValue; uint256 baseValue;
if (allowance[msg.sender][_spender] > 0) {
require(_value == 0, 'ZERO_FIRST');
}
changePeriod(); changePeriod();
baseValue = toBaseAmount(_value); baseValue = toBaseAmount(_value);
allowance[msg.sender][_spender] += baseValue; allowance[msg.sender][_spender] = baseValue;
emit Approval(msg.sender, _spender, _value); emit Approval(msg.sender, _spender, _value);
return true; return true;
} }
// Reduce allowance by amount
function decreaseAllowance(address _spender, uint256 _value) public returns (bool) {
uint256 baseValue;
baseValue = toBaseAmount(_value);
require(allowance[msg.sender][_spender] >= baseValue);
changePeriod();
allowance[msg.sender][_spender] -= baseValue;
emit Approval(msg.sender, _spender, allowance[msg.sender][_spender]);
return true;
}
// Increase allowance by amount
function increaseAllowance(address _spender, uint256 _value) public returns (bool) {
uint256 baseValue;
changePeriod();
baseValue = toBaseAmount(_value);
allowance[msg.sender][_spender] += baseValue;
emit Approval(msg.sender, _spender, allowance[msg.sender][_spender]);
return true;
}
// Implements ERC20, triggers tax and/or redistribution // Implements ERC20, triggers tax and/or redistribution
function transfer(address _to, uint256 _value) public returns (bool) { function transfer(address _to, uint256 _value) public returns (bool) {
uint256 baseValue; uint256 baseValue;
@ -454,7 +487,9 @@ contract DemurrageTokenSingleCap {
baseValue = toBaseAmount(_value); baseValue = toBaseAmount(_value);
require(allowance[_from][msg.sender] >= baseValue); require(allowance[_from][msg.sender] >= baseValue);
allowance[_from][msg.sender] -= baseValue;
result = transferBase(_from, _to, baseValue); result = transferBase(_from, _to, baseValue);
emit Transfer(_from, _to, _value); emit Transfer(_from, _to, _value);
return result; return result;
} }
@ -486,6 +521,29 @@ contract DemurrageTokenSingleCap {
emit OwnershipTransferred(oldOwner, owner); emit OwnershipTransferred(oldOwner, owner);
} }
// Explicitly and irretrievably burn tokens
// Only token minters can burn tokens
function burn(uint256 _value) public {
require(minter[msg.sender]);
require(_value <= account[msg.sender]);
uint256 _delta = toBaseAmount(_value);
applyDemurrage();
decreaseBaseBalance(msg.sender, _delta);
burned += _value;
emit Burn(msg.sender, _value);
}
// Implements ERC20
function totalSupply() public view returns (uint256) {
return supply - burned;
}
// Return total number of burned tokens
function totalBurned() public view returns (uint256) {
return burned;
}
// Implements EIP165 // Implements EIP165
function supportsInterface(bytes4 _sum) public pure returns (bool) { function supportsInterface(bytes4 _sum) public pure returns (bool) {
if (_sum == 0xc6bb4b70) { // ERC20 if (_sum == 0xc6bb4b70) { // ERC20

View File

@ -32,7 +32,15 @@ test: all
python ../python/tests/test_redistribution.py python ../python/tests/test_redistribution.py
python ../python/tests/test_pure.py python ../python/tests/test_pure.py
install: all #install: all
install: single_nocap
#cp -v DemurrageToken*.{json,bin} ../python/erc20_demurrage_token/data/
cp -v DemurrageTokenSingleNocap.json ../python/erc20_demurrage_token/data/
cp -v DemurrageTokenSingleNocap.bin ../python/erc20_demurrage_token/data/
install-broken: all
cp -v DemurrageToken*.{json,bin} ../python/erc20_demurrage_token/data/ cp -v DemurrageToken*.{json,bin} ../python/erc20_demurrage_token/data/
.PHONY: test install .PHONY: test install