# 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 TestDemurrageDefault logging.basicConfig(level=logging.INFO) logg = logging.getLogger() testdir = os.path.dirname(__file__) #TAX_LEVEL = 2 class TestBurn(TestDemurrageDefault): def setUp(self): super(TestBurn, self).setUp() # # def publish(self, tax_level=None): # nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc) # c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) # # if tax_level != None: # self.publisher.settings.demurrage_level = tax_level * (10 ** 32) # self.publisher.settings.sink_address = self.accounts[9] # self.publisher.sink_address = self.accounts[9] # super(TestBurn, self).publish(c) # Burn tokens and immediately check balances and supply def test_burn_basic(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], 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): 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) 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.assert_within(bal, 490000000, 1) # 2% == 10000000 (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(bal, 500000000, 1) 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, 1) # burn tokens and check sink and taxed balance and supply after first redistribution period def test_burned_other_redistribution(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[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 self.assert_within(bal, 490000000, 1) (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.assert_within(bal, 490000000, 1) 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, 10000000, 1) # 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.assert_within(next_bal, 480200000, 0.01) 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): 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 o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0]) r = self.rpc.do(o) logg.info('sink has balance {}'.format(c.parse_balance(r))) 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, 1) self.assert_within_lower(burner_bal, balance_share - total_burned + bob_refund, 1) bob_delta = self.default_supply * ((2 / 1000000) / 1000) self.assert_within_greater(bob_bal, balance_share - bob_delta - bob_refund, 1) self.assertEqual(total_burned, iterations * burn_rate) if __name__ == '__main__': unittest.main()