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August 23, 2024 05:30
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script to monitor complex transactions
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| import csv | |
| import argparse | |
| from web3 import Web3 | |
| import os | |
| from datetime import datetime | |
| import time | |
| WEB3_PROVIDER_URI = 'https://eth-mainnet.g.alchemy.com/v2/token' | |
| # parse command-line arguments | |
| parser = argparse.ArgumentParser() | |
| parser.add_argument('outfile', type=str, help='CSV file to write txhash') | |
| args = parser.parse_args() | |
| outfile = args.outfile | |
| seen = set() | |
| if not os.path.exists(outfile): | |
| print(f"Creating file {outfile}") | |
| output = open(args.outfile, 'a') | |
| outfile = csv.writer(output) | |
| outfile.writerow(['Block', 'Transaction Hash', 'Gas Used', 'Gas Price']) | |
| else: | |
| print(f"Appending to file {outfile}") | |
| with open(outfile, 'r') as f: | |
| reader = csv.reader(f) | |
| for row in reader: | |
| if len(row) > 0: | |
| seen.add(row[2]) | |
| output = open(args.outfile, 'a') | |
| outfile = csv.writer(output) | |
| w3 = Web3(Web3.HTTPProvider(WEB3_PROVIDER_URI)) | |
| block_filter = w3.eth.filter('latest') | |
| def process_transaction(transaction): | |
| tx_hash = transaction['hash'].hex() | |
| gas_used = transaction.get('gas') | |
| gas_price = transaction.get('gasPrice') | |
| base_gas = 21000 | |
| if transaction.get('to') is None: | |
| # contract creation, assuming nobody hacks here | |
| if gas_used > base_gas * 50: # TODO update this threshold if necessary | |
| outfile.writerow([transaction['blockNumber'], tx_hash, gas_used, gas_price]) | |
| return tx_hash | |
| if gas_used > base_gas * 20: # TODO update this threshold if necessary | |
| outfile.writerow([transaction['blockNumber'], tx_hash, gas_used, gas_price]) | |
| return tx_hash | |
| return None | |
| def handle_block(block_hash): | |
| block = w3.eth.get_block(block_hash, full_transactions=True) | |
| for transaction in block.transactions: | |
| process_transaction(transaction) | |
| while True: | |
| try: | |
| for block_hash in block_filter.get_new_entries(): | |
| print(f'{datetime.now()} new block: {block_hash.hex()}') | |
| block = w3.eth.get_block(block_hash) | |
| handle_block(block_hash) | |
| except KeyboardInterrupt: | |
| output.flush() | |
| output.close() | |
| print("Exiting...") | |
| break | |
| except Exception as e: | |
| print(f"Exception: {e}") | |
| time.sleep(5) | |
| if '32000' in str(e): | |
| time.sleep(5) | |
| print('Restarting...') | |
| w3 = Web3(Web3.HTTPProvider(WEB3_PROVIDER_URI)) | |
| block_filter = w3.eth.filter('latest') | |
| continue |
to get actual gas consumed by the transaction, you need to call web3.eth.get_transaction_receipt(txhash) to get the transaction_receipt
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is not the actual gas used might need to treak this