node.py

import sys
import shutil
from typing import Generator
import subprocess
from time import sleep

class GanacheInstance:
    def __init__(self, provider: str, eth_address: str, eth_privkey: str):
        self.provider = provider
        self.eth_address = eth_address
        self.eth_privkey = eth_privkey

def fixture_ganache():
    """Fixture that runs ganache"""
    if not shutil.which("ganache"):
        raise Exception(
            "ganache was not found in PATH, you can install it with `npm install -g ganache`"
        )

    # Address #1 when ganache is run with `--wallet.seed test`, it starts with 1000 ETH
    eth_address = "0xae17D2dD99e07CA3bF2571CCAcEAA9e2Aefc2Dc6"
    eth_privkey = "0xe48ba530a63326818e116be262fd39ae6dcddd89da4b1f578be8afd4e8894b8d"
    eth = int(1e18 * 1e6)
    port = 8545
    proc = subprocess.Popen(
        f"""ganache
        --port {port}
        --chain.networkId 1
        --chain.chainId 1
        --account {eth_privkey},{eth}
        """.replace(
            "\n", " "
        ),
        shell=True,
        stdout=subprocess.DEVNULL,
        stderr=subprocess.STDOUT
    )

    sleep(3)
    return GanacheInstance(f"http://127.0.0.1:{port}", eth_address, eth_privkey), proc

if __name__ == "__main__":
    start_node()