Add minter and burner python interface and test code

python/eth_burner/__init__.py

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+from .burn import EthBurner

python/eth_burner/burn.py

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+# external imports
+from chainlib.eth.tx import TxFormat
+from chainlib.eth.tx import TxFactory
+from chainlib.jsonrpc import JSONRPCRequest
+from chainlib.eth.constant import ZERO_ADDRESS
+from chainlib.eth.contract import ABIContractEncoder
+from chainlib.eth.contract import ABIContractType
+from chainlib.eth.contract import abi_decode_single
+from hexathon import add_0x
+
+
+class EthBurner(TxFactory):
+
+    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 burn_all(self, contract_address, sender_address, tx_format=TxFormat.JSONRPC):
+        enc = ABIContractEncoder()
+        enc.method('burn')
+        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

python/eth_burner/unittest/__init__.py

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+from .interface import TestEthBurnerInterface

python/eth_burner/unittest/base.py

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+# standard imports
+import os
+import logging
+import datetime
+
+# external imports
+from chainlib.eth.unittest.ethtester import EthTesterCase
+from chainlib.connection import RPCConnection
+from chainlib.eth.nonce import RPCNonceOracle
+from chainlib.eth.tx import receipt
+from chainlib.eth.tx import TxFactory
+from chainlib.eth.tx import TxFormat
+from chainlib.eth.contract import ABIContractEncoder
+from chainlib.eth.contract import ABIContractType
+
+# local imports
+from eth_burner import EthBurner
+
+script_dir = os.path.dirname(os.path.realpath(__file__))
+contract_dir = os.path.join(script_dir, '..', '..', 'solidity')
+
+logg = logging.getLogger(__name__)
+
+
+class TestEthBurner(EthTesterCase):
+
+    def setUp(self):
+        super(TestEthBurner, self).setUp()
+
+        self.conn = RPCConnection.connect(self.chain_spec, 'default')
+        nonce_oracle = RPCNonceOracle(self.accounts[0], self.conn)
+
+        f = open(os.path.join(contract_dir, 'BurnerTest.bin'))
+        code = f.read()
+        f.close()
+
+        txf = TxFactory(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        tx = txf.template(self.accounts[0], None, use_nonce=True)
+
+        self.initial_supply = 1024
+        enc = ABIContractEncoder()
+        enc = ABIContractEncoder()
+        enc.uint256(self.initial_supply)
+        args = enc.get()
+
+        tx = txf.set_code(tx, code + args)
+        (tx_hash_hex, o) = txf.build(tx)
+        self.conn.do(o)
+        o = receipt(tx_hash_hex)
+        r = self.conn.do(o)
+        self.assertEqual(r['status'], 1)
+        self.address = r['contract_address']
+        logg.debug('published burner test contract with hash {}'.format(r))

python/eth_burner/unittest/interface.py

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+# external imports
+from chainlib.eth.tx import receipt
+from chainlib.eth.nonce import RPCNonceOracle
+
+# local imports
+from eth_burner import EthBurner
+
+
+class TestEthBurnerInterface:
+
+    def test_supply(self):
+        self.alice = self.accounts[1]
+        nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
+        c = EthBurner(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        (tx_hash, o) = c.burn(self.address, self.accounts[0], int(self.initial_supply / 2))
+        self.rpc.do(o)
+        o = receipt(tx_hash)
+        r = self.rpc.do(o)
+        self.assertEqual(r['status'],1)