first contract interation with aptos

gistfile1.txt

import time
from typing import Optional

from aptos_sdk.account import Account
from aptos_sdk.account_address import AccountAddress
from aptos_sdk.bcs import Serializer
from aptos_sdk.client import FaucetClient, RestClient
from aptos_sdk.transactions import (
    EntryFunction,
    TransactionArgument,
    TransactionPayload,
)

FAUCET_URL = "https://tap.devnet.prod.gcp.aptosdev.com"
NODE_URL = "https://fullnode.devnet.aptoslabs.com/v1"

class HelloBlockchainClient(RestClient):
    def get_message(
        self, contract_address: str, account_address: AccountAddress
    ) -> Optional[str]:
        return self.account_resource(
            account_address, f"0x{contract_address}::message::MessageHolder"
        )

    def set_message(self, contract_address: str, sender: Account, message: str) -> str:
        payload = EntryFunction.natural(
            f"0x{contract_address}::message",
            "set_message",
            [],
            [TransactionArgument(message, Serializer.str)],
        )
        signed_transaction = self.create_single_signer_bcs_transaction(
            sender, TransactionPayload(payload)
        )
        return self.submit_bcs_transaction(signed_transaction)


if __name__ == "__main__":
    contract_address = "xxxxx"

    alice = Account.generate()

    print("\n=== Addresses ===")
    print(f"Alice: {alice.address()}")

    rest_client = HelloBlockchainClient(NODE_URL)
    faucet_client = FaucetClient(FAUCET_URL, rest_client)
    faucet_client.fund_account(alice.address(), 1_000_000_000)

    print("\n=== Testing Alice ===")
    print(
        f"Initial value: {rest_client.get_message(contract_address, alice.address())}"
    )

    for i in range(100):
        start = time.time()
        txn_hash = rest_client.set_message(contract_address, alice, f"Hello, Blockchain {i}")
        rest_client.wait_for_transaction(txn_hash)
        finish = time.time()
        elapsed = (finish - start) * 1000 # aptos the "Solana killer"? Lets put it to the test!!

        new_msg = rest_client.get_message(contract_address, alice.address())
        print(f"elapsed (ms): {elapsed}, new_msg: {new_msg}")