71 lines
2.3 KiB
Python
71 lines
2.3 KiB
Python
# third-party imports
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import sha3
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from hexathon import add_0x
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from eth_abi import encode_single
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from crypto_dev_signer.eth.transaction import EIP155Transaction
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# local imports
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from .hash import (
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keccak256_hex_to_hex,
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keccak256_string_to_hex,
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)
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from .constant import ZERO_ADDRESS
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from .rpc import jsonrpc_template
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from .tx import TxFactory
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# TODO: move to cic-contracts
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erc20_balance_signature = keccak256_string_to_hex('balanceOf(address)')[:8]
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erc20_decimals_signature = keccak256_string_to_hex('decimals()')[:8]
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erc20_transfer_signature = keccak256_string_to_hex('transfer(address,uint256)')[:8]
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class ERC20TxFactory(TxFactory):
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def build(self, tx):
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txe = EIP155Transaction(tx, tx['nonce'], tx['chainId'])
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self.signer.signTransaction(txe)
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tx_raw = txe.rlp_serialize()
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tx_raw_hex = add_0x(tx_raw.hex())
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tx_hash_hex = add_0x(keccak256_hex_to_hex(tx_raw_hex))
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o = jsonrpc_template()
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o['method'] = 'eth_sendRawTransaction'
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o['params'].append(tx_raw_hex)
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return (tx_hash_hex, o)
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def erc20_balance(self, contract_address, address, sender_address=ZERO_ADDRESS):
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o = jsonrpc_template()
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o['method'] = 'eth_call'
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data = erc20_balance_signature
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data += encode_single('address', address).hex()
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data = add_0x(data)
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tx = self.template(sender_address, contract_address)
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tx = self.set_code(tx, data)
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o['params'].append(self.normalize(tx))
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o['params'].append('latest')
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return o
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def erc20_decimals(self, contract_address, sender_address=ZERO_ADDRESS):
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o = jsonrpc_template()
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o['method'] = 'eth_call'
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data = add_0x(erc20_decimals_signature)
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tx = self.template(sender_address, contract_address)
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tx = self.set_code(tx, data)
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o['params'].append(self.normalize(tx))
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o['params'].append('latest')
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return o
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def erc20_transfer(self, contract_address, sender_address, recipient_address, value):
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data = erc20_transfer_signature
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data += encode_single('address', recipient_address).hex()
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data += encode_single('uint256', value).hex()
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data = add_0x(data)
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tx = self.template(sender_address, contract_address)
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tx = self.set_code(tx, data)
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return self.build(tx)
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