62 lines
1.4 KiB
Python
62 lines
1.4 KiB
Python
import sha3
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import uuid
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from hexathon import add_0x
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from eth_abi import encode_single
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from .hash import keccak256_hex
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from .constant import zero_address
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# TODO: move to cic-contracts
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erc20_balance_signature = keccak256_hex('balanceOf(address)')[:8]
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erc20_decimals_signature = keccak256_hex('decimals()')[:8]
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def jsonrpc_template():
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return {
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'jsonrpc': '2.0',
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'id': str(uuid.uuid4()),
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'method': None,
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'params': [],
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}
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def erc20_balance(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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a = call(contract_address, data=data)
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o['params'].append(a)
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o['params'].append('latest')
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return o
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def erc20_decimals(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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arg = add_0x(erc20_decimals_signature)
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#o['params'].append(arg)
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a = call(contract_address, arg)
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o['params'].append(a)
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o['params'].append('latest')
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return o
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def call(contract_address, data, sender_address=zero_address):
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return {
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'from': sender_address,
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'to': contract_address,
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'data': data,
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}
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def jsonrpc_result(o, ep):
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if o.get('error') != None:
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raise ep.translate(o)
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return o['result']
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