test_burn.py (12440B)
1 # standard imports 2 import os 3 import unittest 4 import json 5 import logging 6 import datetime 7 8 # external imports 9 from chainlib.eth.constant import ZERO_ADDRESS 10 from chainlib.eth.nonce import RPCNonceOracle 11 from chainlib.eth.tx import receipt 12 from chainlib.eth.block import ( 13 block_latest, 14 block_by_number, 15 ) 16 17 # local imports 18 from erc20_demurrage_token import DemurrageToken 19 20 # test imports 21 from erc20_demurrage_token.unittest.base import TestDemurrageDefault 22 23 logging.basicConfig(level=logging.INFO) 24 logg = logging.getLogger() 25 26 testdir = os.path.dirname(__file__) 27 28 #TAX_LEVEL = 2 29 30 class TestBurn(TestDemurrageDefault): 31 32 def setUp(self): 33 super(TestBurn, self).setUp() 34 35 # 36 # def publish(self, tax_level=None): 37 # nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc) 38 # c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) 39 # 40 # if tax_level != None: 41 # self.publisher.settings.demurrage_level = tax_level * (10 ** 32) 42 # self.publisher.settings.sink_address = self.accounts[9] 43 # self.publisher.sink_address = self.accounts[9] 44 # super(TestBurn, self).publish(c) 45 46 47 # Burn tokens and immediately check balances and supply 48 def test_burn_basic(self): 49 nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc) 50 c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) 51 52 (tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[1], 1000000) 53 r = self.rpc.do(o) 54 55 nonce_oracle = RPCNonceOracle(self.accounts[1], self.rpc) 56 c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) 57 (tx_hash, o) = c.burn(self.address, self.accounts[1], 600000) 58 r = self.rpc.do(o) 59 o = receipt(tx_hash) 60 r = self.rpc.do(o) 61 self.assertEqual(r['status'], 0) 62 63 nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc) 64 c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) 65 (tx_hash, o) = c.add_minter(self.address, self.accounts[0], self.accounts[1]) 66 r = self.rpc.do(o) 67 68 nonce_oracle = RPCNonceOracle(self.accounts[1], self.rpc) 69 c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) 70 (tx_hash, o) = c.burn(self.address, self.accounts[1], 600000) 71 r = self.rpc.do(o) 72 o = receipt(tx_hash) 73 r = self.rpc.do(o) 74 self.assertEqual(r['status'], 1) 75 76 o = c.total_supply(self.address, sender_address=self.accounts[0]) 77 r = self.rpc.do(o) 78 new_supply = c.parse_total_supply(r) 79 self.assertEqual(new_supply, 400000) 80 81 o = c.total_burned(self.address, sender_address=self.accounts[0]) 82 r = self.rpc.do(o) 83 burned = c.parse_total_burned(r) 84 self.assertEqual(burned, 600000) 85 86 87 # burn tokens and check sink balance and supply after first redistribution period 88 def test_burned_redistribution(self): 89 nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc) 90 c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) 91 92 (tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[0], 1000000000) 93 r = self.rpc.do(o) 94 95 (tx_hash, o) = c.burn(self.address, self.accounts[0], 500000000) 96 self.rpc.do(o) 97 98 (tx_hash, o) = c.transfer(self.address, self.accounts[0], self.sink_address, 500000000) 99 r = self.rpc.do(o) 100 101 self.backend.time_travel(self.start_time + self.period_seconds) 102 103 o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0]) 104 r = self.rpc.do(o) 105 bal = c.parse_balance(r) 106 self.assert_within(bal, 490000000, 1) # 2% == 10000000 107 108 (tx_hash, o) = c.change_period(self.address, self.accounts[0]) 109 r = self.rpc.do(o) 110 o = receipt(tx_hash) 111 r = self.rpc.do(o) 112 self.assertEqual(r['status'], 1) 113 114 o = c.total_supply(self.address, sender_address=self.accounts[0]) 115 r = self.rpc.do(o) 116 new_supply = c.parse_total_supply(r) 117 self.assertEqual(new_supply, 500000000) 118 119 o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0]) 120 r = self.rpc.do(o) 121 bal = c.parse_balance(r) 122 self.assert_within(bal, 500000000, 1) 123 124 self.backend.time_travel(self.start_time + (self.period_seconds * 2)) 125 126 (tx_hash, o) = c.change_period(self.address, self.accounts[0]) 127 r = self.rpc.do(o) 128 o = receipt(tx_hash) 129 r = self.rpc.do(o) 130 self.assertEqual(r['status'], 1) 131 132 o = c.total_supply(self.address, sender_address=self.accounts[0]) 133 r = self.rpc.do(o) 134 new_supply = c.parse_total_supply(r) 135 self.assertEqual(new_supply, 500000000) 136 137 # if we don't burn anything more it should be the same 138 o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0]) 139 r = self.rpc.do(o) 140 bal = c.parse_balance(r) 141 self.assert_within_lower(bal, 500000000, 1) 142 143 144 # burn tokens and check sink and taxed balance and supply after first redistribution period 145 def test_burned_other_redistribution(self): 146 nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc) 147 c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) 148 149 (tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[0], 1000000000) 150 r = self.rpc.do(o) 151 152 (tx_hash, o) = c.burn(self.address, self.accounts[0], 500000000) 153 r = self.rpc.do(o) 154 155 (tx_hash, o) = c.transfer(self.address, self.accounts[0], self.accounts[1], 500000000) 156 r = self.rpc.do(o) 157 158 self.backend.time_travel(self.start_time + self.period_seconds) 159 160 o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0]) 161 r = self.rpc.do(o) 162 bal = c.parse_balance(r) 163 #self.assertEqual(bal, 416873881) # 9 periods demurrage 164 self.assert_within(bal, 490000000, 1) 165 166 (tx_hash, o) = c.change_period(self.address, self.accounts[0]) 167 r = self.rpc.do(o) 168 o = receipt(tx_hash) 169 r = self.rpc.do(o) 170 self.assertEqual(r['status'], 1) 171 172 o = c.total_supply(self.address, sender_address=self.accounts[0]) 173 r = self.rpc.do(o) 174 new_supply = c.parse_total_supply(r) 175 self.assertEqual(new_supply, 500000000) 176 177 o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0]) 178 r = self.rpc.do(o) 179 bal = c.parse_balance(r) 180 self.assert_within(bal, 490000000, 1) 181 182 o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0]) 183 r = self.rpc.do(o) 184 sink_bal = c.parse_balance(r) 185 self.assert_within_lower(sink_bal, 10000000, 1) # TODO is this ok variance, 1.0 is ppm? 186 187 self.backend.time_travel(self.start_time + (self.period_seconds * 2)) 188 189 (tx_hash, o) = c.change_period(self.address, self.accounts[0]) 190 r = self.rpc.do(o) 191 o = receipt(tx_hash) 192 r = self.rpc.do(o) 193 self.assertEqual(r['status'], 1) 194 195 o = c.total_supply(self.address, sender_address=self.accounts[0]) 196 r = self.rpc.do(o) 197 new_supply = c.parse_total_supply(r) 198 self.assertEqual(new_supply, 500000000) 199 200 o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0]) 201 r = self.rpc.do(o) 202 next_bal = c.parse_balance(r) 203 self.assert_within(next_bal, 480200000, 0.01) 204 205 o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0]) 206 r = self.rpc.do(o) 207 prev_sink_bal = sink_bal 208 bal = prev_sink_bal + (bal - next_bal) 209 sink_bal = c.parse_balance(r) 210 self.assert_within_lower(sink_bal, bal, 0.09) # TODO is this ok variance, 1.0 is ppm? 211 212 213 # verify expected results of balance and supply after multiple redistribution periods 214 def test_burn_accumulate(self): 215 nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc) 216 c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) 217 218 (tx_hash, o) = c.add_minter(self.address, self.accounts[0], self.sink_address) 219 self.rpc.do(o) 220 o = receipt(tx_hash) 221 r = self.rpc.do(o) 222 self.assertEqual(r['status'], 1) 223 224 (tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.sink_address, self.default_supply) 225 r = self.rpc.do(o) 226 227 balance_share = int(self.default_supply / 2) 228 nonce_oracle = RPCNonceOracle(self.sink_address, self.rpc) 229 c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) 230 (tx_hash, o) = c.transfer(self.address, self.sink_address, self.accounts[1], balance_share) 231 r = self.rpc.do(o) 232 233 new_supply = None 234 burn_rate = 1000 235 sink_bal = None 236 bob_bal = None 237 bob_refund = None 238 239 o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0]) 240 r = self.rpc.do(o) 241 bob_bal = c.parse_balance(r) 242 prev_bob_bal = bob_bal 243 244 o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0]) 245 r = self.rpc.do(o) 246 logg.info('sink has balance {}'.format(c.parse_balance(r))) 247 248 iterations = 100 249 250 for i in range(1, iterations + 1): 251 nonce_oracle = RPCNonceOracle(self.sink_address, self.rpc) 252 c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) 253 254 if bob_refund != None: 255 (tx_hash, o) = c.transfer(self.address, self.sink_address, self.accounts[1], bob_refund) 256 r = self.rpc.do(o) 257 o = receipt(tx_hash) 258 r = self.rpc.do(o) 259 self.assertEqual(r['status'], 1) 260 261 (tx_hash, o) = c.burn(self.address, self.sink_address, burn_rate) 262 r = self.rpc.do(o) 263 o = receipt(tx_hash) 264 r = self.rpc.do(o) 265 self.assertEqual(r['status'], 1) 266 267 nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc) 268 c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle) 269 o = c.total_supply(self.address, sender_address=self.accounts[0]) 270 r = self.rpc.do(o) 271 new_supply = c.parse_total_supply(r) 272 273 self.backend.time_travel(self.start_time + (self.period_seconds * i)) 274 275 (tx_hash, o) = c.change_period(self.address, self.accounts[0]) 276 self.rpc.do(o) 277 278 o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0]) 279 r = self.rpc.do(o) 280 bob_bal = c.parse_balance(r) 281 bob_refund = prev_bob_bal - bob_bal 282 283 o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0]) 284 r = self.rpc.do(o) 285 burner_bal = c.parse_balance(r) 286 287 sum_supply = bob_bal + burner_bal 288 289 o = c.total_burned(self.address, sender_address=self.accounts[0]) 290 r = self.rpc.do(o) 291 total_burned = c.parse_balance(r) 292 293 o = c.to_base_amount(self.address, total_burned, sender_address=self.accounts[0]) 294 r = self.rpc.do(o) 295 total_burned_base = c.parse_balance(r) 296 297 expected_supply = self.default_supply - (burn_rate * i) 298 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)) 299 self.assertEqual(new_supply, expected_supply) 300 301 sum_supply = burner_bal + bob_bal 302 logg.debug('balances sink {} bob {} total {} supply real {} original {}'.format(sink_bal, bob_bal, sum_supply, new_supply, self.default_supply)) 303 304 self.assert_within_lower(sum_supply, new_supply, 1) 305 self.assert_within_lower(burner_bal, balance_share - total_burned + bob_refund, 1) 306 307 bob_delta = self.default_supply * ((2 / 1000000) / 1000) 308 self.assert_within_greater(bob_bal, balance_share - bob_delta - bob_refund, 1) 309 310 self.assertEqual(total_burned, iterations * burn_rate) 311 312 313 if __name__ == '__main__': 314 unittest.main()