1

When you request random number, the Chainlink VRF2 returns it by calling following function.

function fulfillRandomWords(
        uint256, /* requestId */
        uint256[] memory randomWords
    ) internal override {
        s_randomWords = randomWords;
        randomNum = s_randomWords[0];
    }

There is not guaranteed time. What is the best way to catch when it is arrived?

What I have:

def request_random():
    account = get_account()
    contract = AdvancedCollectible[-1]

    # Request Random
    tx = contract.requestRandom({"from": account})

    print("Waiting for the callback...")

    tx.wait(5)

    while True:
        random_num = contract.randomNum()

        if random_num != 0:
            print("Finally received random num:", random_num)
            break
        else:
            print("Waiting another 5 sn")
            time.sleep(5)

Another way would be events but since fulfillRandomWords function is called by coordinator, I can't create a transaction to listen event of this function.

I am sure there is better way to do so...

3
  • I'd use an event, if it is triggered by your contract you can use its address to filter the events.
    – Ismael
    Apr 21 at 4:12
  • Fallack function is triggered automatically. Thus, I cant access the event emiitted in it
    – Emrah
    Apr 21 at 4:46
  • You could modify fulfillRandomWords to trigger the event from there.
    – Ismael
    Apr 21 at 4:56

1 Answer 1

0

You can create a custom event for the randomNumberConsumer contract that you can listen for in a client (such as a frontend or javascript client).

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