Error in sending future transactions with Algorand Python SDK

post by Obi on Sep 29, 2021

I am trying to send a transaction 20 minutes into the future but I end up with this error

Traceback (most recent call last):
  File "C:\Users\0xEarl\anaconda3\lib\site-packages\algosdk\v2client\algod.py", line 73, in algod_request
    resp = urlopen(req)
  File "C:\Users\0xEarl\anaconda3\lib\urllib\request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "C:\Users\0xEarl\anaconda3\lib\urllib\request.py", line 531, in open
    response = meth(req, response)
  File "C:\Users\0xEarl\anaconda3\lib\urllib\request.py", line 640, in http_response
    response = self.parent.error(
  File "C:\Users\0xEarl\anaconda3\lib\urllib\request.py", line 569, in error
    return self._call_chain(*args)
  File "C:\Users\0xEarl\anaconda3\lib\urllib\request.py", line 502, in _call_chain
    result = func(*args)
  File "C:\Users\0xEarl\anaconda3\lib\urllib\request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 400: Bad Request

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\0xEarl\anaconda3\lib\site-packages\algosdk\v2client\algod.py", line 78, in algod_request
    raise error.AlgodHTTPError(json.loads(e)["message"], code)
algosdk.error.AlgodHTTPError: TransactionPool.Remember: txn dead: round 16527277 outside of 16527542--16528542

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "c:/Users/0xEarl/Desktop/Learn_Algo/futuretx.py", line 41, in <module>
    txid = algod_client.send_transaction(signed_txn) # send the transaction
  File "C:\Users\0xEarl\anaconda3\lib\site-packages\algosdk\v2client\algod.py", line 195, in send_transaction
    return self.send_raw_transaction(encoding.msgpack_encode(txn),
  File "C:\Users\0xEarl\anaconda3\lib\site-packages\algosdk\v2client\algod.py", line 214, in send_raw_transaction
    return self.algod_request("POST", req, data=txn, **kwargs)["txId"]
  File "C:\Users\0xEarl\anaconda3\lib\site-packages\algosdk\v2client\algod.py", line 80, in algod_request
    raise error.AlgodHTTPError(e, code)
algosdk.error.AlgodHTTPError: {"message":"TransactionPool.Remember: txn dead: round 16527277 outside of 16527542--16528542"}

post by fabrice on Sep 29, 2021

Welcome to Algorand!

The node will only accept the transaction when the current round is in the validity window. You need to have a service/script that waits until the moment the current round passes the first valid round of the transaction, and then only send the transaction.

post by Obi on Sep 30, 2021

Hello @fabrice i have attached the code for your review, thanks.

import json
from algosdk.v2client import algod
from algosdk import transaction

algod_address = "https://mainnet-algorand.api.purestake.io/ps2" # network address
algod_token = "🔑" # api key
headers = {
    "X-API-Key": algod_token,
}

# initiate a new client with the given parameters
algod_client = algod.AlgodClient(algod_token, algod_address, headers)

params = algod_client.suggested_params()
params.flat_fee = True
params.fee = 1000
fee = params.fee
gh = params.gh

# check node status
status = algod_client.status()
# to read json data
node_stat = json.dumps(status, indent=4)
node_stat = json.loads(node_stat)

current_round = int(node_stat["last-round"])
avg_block_time = 4.5
target_submission_time_in_seconds = 1200
avg_number_of_block_produced_within_time = int(target_submission_time_in_seconds/avg_block_time)
first_round = int(current_round + avg_number_of_block_produced_within_time)
last_round = int(first_round + 1000)

sender = 'I76WK5LC6JDKOIQ4AZ2BKGENET37AUR57V4NRKKDY3UARDTJ534LGPPVCE'
sender_key = '🔑'
reciever = '7WEP4COP42SO6XPCIUIEXYPBYWL2K3QNEV73FPNSU5WC26JYTXMNSC6QJI'
amount = 100000

payit = transaction.PaymentTxn(sender, fee, first_round, last_round, gh, reciever, amount)
signed_txn = payit.sign(sender_key)
# submit the transaction
txid = algod_client.send_transaction(signed_txn) # send the transaction
print(f"Successfully sent transaction with txID: {txid}") # prints the transaction id

post by fabrice on Sep 30, 2021

In this specific case, the issue is that

post by Obi on Sep 30, 2021

Hello Fabrice, i have fixed the issue thanks

post by TheD on Oct 16, 2021

Hello Obi, Can you please share the code with the solution. Thank you

post by Obi on Feb 10, 2022

def send_future_algo(time_in_milli_seconds: int, sender_addr: str, receiver: str, amount: int, sender_key: str) -> dict:

"""send timed algo transactions by the networks standards, but this is crap"""

transactioninfo = {}

params = algod_client.suggested_params()

status = algod_client.status()

current_round = status['last-round']

avg_blocktime = 4.5

avg_blocks_produced = time_in_milli_seconds/avg_blocktime

first_valid_round = int(current_round + avg_blocks_produced)

last_valid_round = int(first_valid_round + 1000)

params.flat_fee = True

params.fee = 1000

params.first = first_valid_round

params.last = last_valid_round

while 1 > 0:

status = algod_client.status()

current_round = int(status['last-round'])

if current_round > first_valid_round:

txn = PaymentTxn(sender_addr, params, receiver, amount)

signed_txn = txn.sign(sender_key)

txid = algod_client.send_transaction(signed_txn) # send the transaction

transactioninfo['txid'] = txid

transactioninfo['link'] = f"https://testnet.algoexplorer.io/tx/{txid}"

break

return transactioninfo