Created
August 5, 2019 12:27
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import json | |
from eth_utils import encode_hex | |
from web3 import HTTPProvider, Web3 | |
from solc import compile_source | |
from web3.contract import ConciseContract | |
# Solidity source code | |
contract_source_code = ''' | |
pragma solidity ^0.4.18; | |
contract WETH9 { | |
string public name = "Wrapped Ether"; | |
string public symbol = "WETH"; | |
uint8 public decimals = 18; | |
event Approval(address indexed src, address indexed guy, uint wad); | |
event Transfer(address indexed src, address indexed dst, uint wad); | |
event Deposit(address indexed dst, uint wad); | |
event Withdrawal(address indexed src, uint wad); | |
mapping (address => uint) public balanceOf; | |
mapping (address => mapping (address => uint)) public allowance; | |
function() public payable { | |
deposit(); | |
} | |
function deposit() public payable { | |
balanceOf[msg.sender] += msg.value; | |
Deposit(msg.sender, msg.value); | |
} | |
function withdraw(uint wad) public { | |
require(balanceOf[msg.sender] >= wad); | |
balanceOf[msg.sender] -= wad; | |
msg.sender.transfer(wad); | |
Withdrawal(msg.sender, wad); | |
} | |
function totalSupply() public view returns (uint) { | |
return this.balance; | |
} | |
function approve(address guy, uint wad) public returns (bool) { | |
allowance[msg.sender][guy] = wad; | |
Approval(msg.sender, guy, wad); | |
return true; | |
} | |
function transfer(address dst, uint wad) public returns (bool) { | |
return transferFrom(msg.sender, dst, wad); | |
} | |
function transferFrom(address src, address dst, uint wad) | |
public | |
returns (bool) | |
{ | |
require(balanceOf[src] >= wad); | |
if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) { | |
require(allowance[src][msg.sender] >= wad); | |
allowance[src][msg.sender] -= wad; | |
} | |
balanceOf[src] -= wad; | |
balanceOf[dst] += wad; | |
Transfer(src, dst, wad); | |
return true; | |
} | |
} | |
''' | |
compiled_sol = compile_source(contract_source_code) # Compiled source code | |
contract_interface = compiled_sol['<stdin>:WETH9'] | |
# web3.py instance | |
w3 = Web3(HTTPProvider("http://127.0.0.1:8545")) | |
# set pre-funded account as sender | |
w3.eth.defaultAccount = w3.eth.accounts[0] | |
# Instantiate and deploy contract | |
weth = w3.eth.contract(abi=contract_interface['abi'], bytecode=contract_interface['bin']) | |
# Submit the transaction that deploys the contract | |
tx_hash = weth.constructor().transact() | |
print(f"Transaction hash: {encode_hex(tx_hash)}") | |
# Wait for the transaction to be mined, and get the transaction receipt | |
tx_receipt = w3.eth.waitForTransactionReceipt(tx_hash) | |
print(tx_receipt) | |
# Create the contract instance with the newly-deployed address | |
weth_proxy = w3.eth.contract( | |
address=tx_receipt.contractAddress, | |
abi=contract_interface['abi'], | |
) | |
reader = ConciseContract(weth_proxy) | |
assert reader.symbol() == "WETH" | |
assert reader.name() == "Wrapped Ether" | |
assert reader.decimals() == 18 |
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