From cf1506d2e4434b7dce3e637037cc812920fa5641 Mon Sep 17 00:00:00 2001
From: Prithviraj8 <prithvimurthy8@gmail.com>
Date: Wed, 7 Sep 2022 15:39:05 +0530
Subject: [PATCH] add flashbots file

---
 components/flashbots.py | 105 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 components/flashbots.py

diff --git a/components/flashbots.py b/components/flashbots.py
new file mode 100644
index 0000000..5078bd4
--- /dev/null
+++ b/components/flashbots.py
@@ -0,0 +1,105 @@
+from eth_account.signers.local import LocalAccount
+from web3.middleware import construct_sign_and_send_raw_middleware
+
+from flashbots import flashbot
+from flashbots.types import SignTx
+from eth_account.account import Account
+from web3 import Web3, HTTPProvider
+from web3.types import TxParams, Wei
+
+import os
+
+"""
+In this example we setup a transaction for 0.1 eth with a gasprice of 1
+From here we will use Flashbots to pass a bundle with the needed content
+"""
+
+# ETH_ACCOUNT_SIGNATURE is an Ethereum private key that does NOT store funds and is NOT your bot's primary key.
+#This is an identifying key for signing payloads to establish reputation and whitelisting
+ETH_ACCOUNT_SIGNATURE: LocalAccount = Account.from_key(os.environ.get("ETH_SIGNATURE_KEY"))
+ETH_ACCOUNT_FROM: LocalAccount = Account.from_key(os.environ.get("ETH_PRIVATE_FROM"))
+ETH_ACCOUNT_TO: LocalAccount = Account.from_key(os.environ.get("ETH_PRIVATE_TO"))
+
+print("Connecting to RPC")
+
+# Create a web3 object with a standard json rpc provider, such as Infura, Alchemy, or your own node.
+w3 = Web3(HTTPProvider("http://localhost:8545"))
+w3.middleware_onion.add(construct_sign_and_send_raw_middleware(ETH_ACCOUNT_FROM))
+
+# Flashbots providers require both a standard provider and ETH_ACCOUNT_SIGNATURE (to establish reputation)
+flashbot(w3, ETH_ACCOUNT_SIGNATURE)
+
+print(f"From account {ETH_ACCOUNT_FROM.address}: {w3.eth.get_balance(ETH_ACCOUNT_FROM.address)}")
+print(f"To account {ETH_ACCOUNT_TO.address}: {w3.eth.get_balance(ETH_ACCOUNT_TO.address)}")
+
+# Setting up an transaction with 1 in gasPrice where we are trying to send
+print("Sending request")
+params: TxParams = {
+    "from": ETH_ACCOUNT_FROM.address,
+    "to": ETH_ACCOUNT_TO.address,
+    "value": w3.toWei("1.0", "gwei"),
+    "gasPrice": w3.toWei("1.0", "gwei"),
+    "nonce": w3.eth.get_transaction_count(ETH_ACCOUNT_FROM.address),
+}
+
+try:
+    tx = w3.eth.send_transaction(
+        params,
+    )
+    print("Request sent! Waiting for receipt")
+except ValueError as e:
+    # Skipping if TX already is added and pending
+    if "replacement transaction underpriced" in e.args[0]["message"]:
+        print("Have TX in pool we can use for the example")
+    else:
+        raise
+
+
+print("Setting up flashbots request")
+nonce = w3.eth.get_transaction_count(ETH_ACCOUNT_FROM.address)
+bribe = w3.toWei("0.01", "ether")
+
+signed_tx: SignTx = {
+    "to": ETH_ACCOUNT_TO.address,
+    "value": bribe,
+    "nonce": nonce + 1,
+    "gasPrice": 0,
+    "gas": 25000,
+}
+
+signed_transaction = ETH_ACCOUNT_TO.sign_transaction(signed_tx)
+
+bundle = [
+    #  some transaction
+    {
+        "signer": ETH_ACCOUNT_FROM,
+        "transaction": {
+            "to": ETH_ACCOUNT_TO.address,
+            "value": Wei(123),
+            "nonce": nonce,
+            "gasPrice": 0,
+        },
+    },
+    # the bribe
+    {
+        "signed_transaction": signed_transaction.rawTransaction,
+    },
+]
+
+block = w3.eth.block_number
+
+result = w3.flashbots.send_bundle(bundle, target_block_number=w3.eth.blockNumber + 3)
+result.wait()
+receipts = result.receipts()
+block_number = receipts[0].blockNumber
+
+# the miner has received the amount expected
+bal_before = w3.eth.get_balance(ETH_ACCOUNT_FROM.address, block_number - 1)
+bal_after = w3.eth.get_balance(ETH_ACCOUNT_FROM.address, block_number)
+profit = bal_after - bal_before - w3.toWei("2", "ether")  # sub block reward
+print("Balance before", bal_before)
+print("Balance after", bal_after)
+assert profit == bribe
+
+# the tx is successful
+print(w3.eth.get_balance(ETH_ACCOUNT_TO.address))