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I have been trying to solve this issue for a while now and would really appreciate any help i can get.

i am essentially trying to create a loop that doesnt stop after one succesful tx. End goal is to produce a loop that will run the function which sends a tx to the smart contract. I have the function all sorted and its a simple tx to a smart contract on pancakeswap router.

Ive now tried a While True: loop, as well as the Scheduler but can never get it to run the function more than once, as once the statement is 'True' it simply stops. I just want to send tx every 3 seconds to a smart contract its that simple ahha!!

I would really appreciate any guidance

Thank you!

Example Code:

Pancakeswaptx = contract.functions.swapExactETHForTokens(
    0,
    [spend,tokentobuy],
    my_address,
    (int(start)+ 10000)
    ).buildTransaction({
    'from': my_address,
    'value': web3.toWei(0.001,'ether'),
    'gas': 250000,
    'gasPrice': web3.toWei('5','gwei'), 
    'nonce': web3.eth.get_transaction_count(my_address),
    })

def runtx():
    signed_tx = web3.eth.account.signTransaction(Pancakeswaptx, privatekey)
    transaction = web3.eth.send_raw_transaction(signed_tx.rawTransaction)
    print(web3.toHex(transaction))

while True: 
    time.sleep(1)
    runtx()

Note: i get the following error after 1 iteration and succesful tx, both when i use the loop and scheduler:

ValueError: {'code': -32000, 'message': 'already known'}
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7
  • show code (remove private infos) please, otherwise noone can help
    – Majd TL
    Oct 29, 2021 at 9:46
  • @MajdTL, added some example code using the 'while True' loop
    – user84407
    Oct 29, 2021 at 9:57
  • I think you are providing the exact same transaction everytime. The nonce part is especially problematic. Try incrementing the nonce for every transaction.
    – Itération 122442
    Oct 29, 2021 at 14:51
  • @Itération122442 surely the nonce would just update after each tx as its just counting the tx count? so when i run it again after a tx itll be one higher
    – user84407
    Oct 29, 2021 at 21:06
  • Nonce goes up when the transaction is mined. I doubt it is mined in less than 1 second, as per your script.
    – Itération 122442
    Oct 30, 2021 at 9:44

1 Answer 1

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if you think first tx sholud mine

def runtx():
signed_tx = web3.eth.account.signTransaction(Pancakeswaptx, privatekey)
transaction = web3.eth.send_raw_transaction(signed_tx.rawTransaction)    
wait_tx = web3.eth.get_transaction_receipt(transaction)
if wait_tx:
    nonce = nonce + 1

if transaction mine is nor important

def runtx():
signed_tx = web3.eth.account.signTransaction(Pancakeswaptx, privatekey)
transaction = web3.eth.send_raw_transaction(signed_tx.rawTransaction)
print(web3.toHex(transaction))
nonce = nonce + 1
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