script to withdraw exact amount of tokens
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#!/opt/anaconda3/bin/python
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from web3 import Web3
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from web3.utils.transactions import wait_for_transaction_receipt
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import json
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from toml import load
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import sys
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from random import randint
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_tokenName = 'BridgeableToken'
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_abiFile = _tokenName+".abi"
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test_env_db = '/home/koal/parity/bridge/test_env_db.toml'
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try:
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test_env = load(test_env_db)
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except:
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sys.exit(1)
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bridge_config = load(test_env['bridge_config'])
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bridge_db = load(test_env['bridge_db'])
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_IPC_file = bridge_config['foreign']['ipc']
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web3 = Web3(Web3.IPCProvider(_IPC_file))
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_gasPrice = bridge_config['transactions']['withdraw_confirm']['gas_price']
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tokenContractAddress = web3.toChecksumAddress(test_env['token_contract_address'])
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bridgeContractAddress = web3.toChecksumAddress(bridge_db['foreign_contract_address'])
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if 'actor_address' in test_env:
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actor = web3.toChecksumAddress(test_env['actor_address'])
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else:
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sys.exit("actor is not set in testenv DB")
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#----------------------------------------------------------------------------
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# Read ABI
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#----------------------------------------------------------------------------
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with open(_abiFile) as f:
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_contractABI=json.load(f)
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f.close()
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#print(_contractABI[0])
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ContractFactory = web3.eth.contract(
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abi = _contractABI,
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)
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if (len(sys.argv) == 2):
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value = int(sys.argv[1])
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else:
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sys.exit(1)
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#############################################################################
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# MAIN PART STARTED HERE
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#############################################################################
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TokenContract = ContractFactory(tokenContractAddress)
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print("Withdraw", value, "from Foreign bridge")
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txTmpl = {'from': actor,
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'gasPrice': _gasPrice}
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txToSend = TokenContract.functions.approveAndCall(bridgeContractAddress, value, b'').buildTransaction(txTmpl)
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# This is needed since sendTransaction does not expect this argument parameter and does not skip it by some reason
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txToSend.pop('chainId', None)
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txHash = web3.personal.sendTransaction(txToSend, "11")
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wait_for_transaction_receipt(web3, txHash)
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print("TX:", txHash.hex())
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sys.exit(0)
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