scripts/deploy_chatlogger.py

#!/usr/bin/env python
"""
Compile & deploy ChatLogger.sol to the Ganache chain running on GANACHE_RPC_URL
then print the new contract address to STDOUT (no extra text).

• Requires env vars: GANACHE_RPC_URL, GANACHE_PK
• Writes ABI to app/core/chatlogger_abi.json so blockchain.py can load it.
"""

import json
import os
import pathlib
from web3 import Web3
from solcx import install_solc, compile_source

# --------------------------------------------------------------------------- #
#  Compile contract
# --------------------------------------------------------------------------- #
install_solc("0.8.20")

SRC_PATH = pathlib.Path("contracts/ChatLogger.sol")
ABI_PATH = pathlib.Path("app/core/chatlogger_abi.json")

source_code = SRC_PATH.read_text()
compiled = compile_source(
    source_code,
    solc_version="0.8.20",
    output_values=["abi", "bin"],
)
_, iface = compiled.popitem()
abi, bytecode = iface["abi"], iface["bin"]

# --------------------------------------------------------------------------- #
#  Deploy
# --------------------------------------------------------------------------- #
DEFAULT_PK = "0x4f3edf983ac636a65a842ce7c78d9aa706d3b113bce9c46f30d7d21715b23b1d"
private_key = os.getenv("GANACHE_PK", DEFAULT_PK)

w3 = Web3(Web3.HTTPProvider(os.getenv("GANACHE_RPC_URL", "http://127.0.0.1:8545")))
acct = w3.eth.account.from_key(private_key)

# ── build txn ──────────────────────────────────────────────────────────────
txn = (
    w3.eth.contract(abi=abi, bytecode=bytecode)
    .constructor()
    .build_transaction(
        {
            "from": acct.address,
            "nonce": w3.eth.get_transaction_count(acct.address),
            "gas": 3_000_000,
            "gasPrice": w3.to_wei("1", "gwei"),
        }
    )
)

signed = acct.sign_transaction(txn)
raw_tx = signed.raw_transaction if hasattr(signed, "raw_transaction") else signed.rawTransaction
tx_hash = w3.eth.send_raw_transaction(raw_tx)
receipt = w3.eth.wait_for_transaction_receipt(tx_hash)
address = receipt.contractAddress

# --------------------------------------------------------------------------- #
#  Persist ABI for runtime use and echo address
# --------------------------------------------------------------------------- #
ABI_PATH.parent.mkdir(parents=True, exist_ok=True)
ABI_PATH.write_text(json.dumps(abi, indent=2))
print(address, flush=True)          # Docker CMD captures this