i trying to using bundle flashbots on python 3.10 but got error, how to solve this ? [Screenshot by Lightshot]
"""
Minimal viable example of flashbots usage with dynamic fee transactions.
Sends a bundle of two transactions which transfer some ETH into a random account.
Environment Variables:
- ETH_SENDER_KEY: Private key of account which will send the ETH.
- ETH_SIGNER_KEY: Private key of account which will sign the bundle.
- This account is only used for reputation on flashbots and should be empty.
- PROVIDER_URL: HTTP JSON-RPC Ethereum provider URL.
"""
import os
import secrets
import random
from uuid import uuid4
from eth_account.account import Account
from eth_account.signers.local import LocalAccount
from flashbots import flashbot
from web3 import Web3, HTTPProvider
from web3.exceptions import TransactionNotFound
from web3.types import TxParams
# change this to `False` if you want to use mainnet
USE_HOLESKY = False
CHAIN_ID = 17000 if USE_HOLESKY else 1
def env(key: str) -> str:
return os.environ.get(key)
def random_account() -> LocalAccount:
key = "0x" + secrets.token_hex(32)
return Account.from_key(key)
def main() -> None:
# account to send the transfer and sign transactions
sender: LocalAccount = Account.from_key("pvkeysender")
# account to receive the transfer
receiverAddress: str = "0xaddr_receiver"
# account to sign bundles & establish flashbots reputation
# NOTE: this account should not store funds
signer: LocalAccount = Account.from_key("pvkeysigner")
validatorlist = ["https://relay.flashbots.net","https://rpc.beaverbuild.org","https://rpc.titanbuilder.xyz","https://rsync-builder.xyz"]
validator = random.choice(validatorlist)
w3 = Web3(HTTPProvider("https://pancake-eth.rpc.blxrbdn.com"))
if USE_HOLESKY:
#https://docs.flashbots.net/flashbots-auction/advanced/rpc-endpoint
flashbot(w3, signer, validator)
else:
flashbot(w3, signer)
print(f"Sender address: {sender.address}")
print(f"Receiver address: {receiverAddress}")
print(
f"Sender account balance: {w3.from_wei(w3.eth.get_balance(sender.address), 'ether')} ETH"
)
print(
f"Receiver account balance: {w3.from_wei(w3.eth.get_balance(receiverAddress), 'ether')} ETH"
)
# bundle two EIP-1559 (type 2) transactions, pre-sign one of them
# NOTE: chainId is necessary for all EIP-1559 txns
# NOTE: nonce is required for signed txns
nonce = w3.eth.get_transaction_count(sender.address)
tx1: TxParams = {
"to": receiverAddress,
"value": w3.to_wei(0.00028, "ether"),
"gas": 21000,
"maxFeePerGas": w3.to_wei(6, "gwei"),
"maxPriorityFeePerGas": w3.to_wei(1, "gwei"),
"nonce": nonce,
"chainId": CHAIN_ID,
"type": 2,
}
tx1_signed = sender.sign_transaction(tx1)
tx2: TxParams = {
"to": receiverAddress,
"value": w3.to_wei(0.00028, "ether"),
"gas": 21000,
"maxFeePerGas": w3.to_wei(6, "gwei"),
"maxPriorityFeePerGas": w3.to_wei(1, "gwei"),
"nonce": nonce + 1,
"chainId": CHAIN_ID,
"type": 2,
}
tx2_signed = sender.sign_transaction(tx2)
bundle = [
{"signed_transaction": tx1_signed.rawTransaction},
{"signed_transaction": tx2_signed.rawTransaction},
#{"signer": sender, "transaction": tx2},
]
# keep trying to send bundle until it gets mined
while True:
block = w3.eth.block_number
print(f"Simulating on block {block}")
# simulate bundle on current block
try:
w3.flashbots.simulate(bundle, block)
print("Simulation successful.")
except Exception as e:
print("Simulation error", e)
return
# send bundle targeting next block
print(f"Sending bundle targeting block {block+1}")
replacement_uuid = str(uuid4())
print(f"replacementUuid {replacement_uuid}")
send_result = w3.flashbots.send_bundle(
bundle,
target_block_number=block + 1,
opts={"replacementUuid": replacement_uuid},
)
print("bundleHash", w3.toHex(send_result.bundle_hash()))
stats_v1 = w3.flashbots.get_bundle_stats(
w3.toHex(send_result.bundle_hash()), block
)
print("bundleStats v1", stats_v1)
stats_v2 = w3.flashbots.get_bundle_stats_v2(
w3.toHex(send_result.bundle_hash()), block
)
print("bundleStats v2", stats_v2)
send_result.wait()
try:
receipts = send_result.receipts()
print(f"\nBundle was mined in block {receipts[0].blockNumber}\a")
break
except TransactionNotFound:
print(f"Bundle not found in block {block+1}")
# essentially a no-op but it shows that the function works
cancel_res = w3.flashbots.cancel_bundles(replacement_uuid)
print(f"canceled {cancel_res}")
print(
f"Sender account balance: {w3.fromWei(w3.eth.get_balance(sender.address), 'ether')} ETH"
)
print(
f"Receiver account balance: {w3.fromWei(w3.eth.get_balance(receiverAddress), 'ether')} ETH"
)
if __name__ == "__main__":
main()
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent