dai_mint_burn.py

import requests
from tqdm import trange
from web3 import Web3, HTTPProvider


w3 = Web3(HTTPProvider('http://127.0.0.1:8545', {'timeout': 120}))


def get_contract(address):
    resp = requests.get(
        'http://api.etherscan.io/api',
        params=dict(module='contract', action='getabi', address=address, format='raw')
    )
    return w3.eth.contract(address, abi=resp.json())


def stream_logs(event, from_block, to_block, batch_size):
    for start in trange(from_block, to_block, batch_size):
        for log in event.createFilter(fromBlock=start, toBlock=start+step-1).get_all_entries():
            yield log


def count_total(logs):
    total_wei = sum(log['args']['wad'] for log in logs)
    return w3.fromWei(total_wei, 'ether')


def main():
    dai = get_contract('0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359')
    first_block, last_block = 4752008, w3.eth.blockNumber
    
    mint = count_total(stream_logs(dai.events.Mint, first_block, last_block, 4096))
    burn = count_total(stream_logs(dai.events.Burn, first_block, last_block, 4096))
    
    print(
        f'mint: {mint}',
        f'burn: {burn}',
        f'circ: {mint-burn}',
        sep='\n'
    )


if __name__ == "__main__":
    main()