Build & Sign Transaction using CardanoTools
===========================================

This module uses CardanoTools to build, sign, and submit a transaction: ::

    import json
    import base64
    from cardano_tools import WalletHTTP
    import ogmios

    WALLET_URL = "http://localhost"
    WALLET_PORT = 8090
    WALLET_NAME = "my-wallet"
    MNEMONIC_FILE = "./tests/test_wallet/test.seed"

    # Unsafe to use in production - read from environment variable instead
    WALLET_PASSPHRASE = "my-passphrase"


    cw_api = WalletHTTP(WALLET_URL, WALLET_PORT)

    # Import wallet if it hasn't been already
    if not (wallet_id := cw_api.get_wallet_by_name(WALLET_NAME).get("id")):
        with open(MNEMONIC_FILE, "r") as f:
            mnemonic = f.read()
            cw_api.create_wallet(WALLET_NAME, mnemonic.strip().split(" "), WALLET_PASSPHRASE)
            wallet_id = cw_api.get_wallet_by_name(WALLET_NAME).get("id")

    # Send 2 ADA and a native asset (CHOC) in quantity of 2000 to an address.
    target_addr = "addr_test1wztjpvnxahymaejx9qa9c3xddkt3ujhjykmt83uu8xfvprq7hxv53"
    lovelace_amt = 2 * 1e6
    token_policy = "57fca08abbaddee36da742a839f7d83a7e1d2419f1507fcbf3916522"
    asset_name = "CHOC"
    token_qty = 2000

    payload = json.loads(
        f"""{{
            "payments": [
                {{
                    "address": "{target_addr}",
                    "amount": {{
                        "quantity": {lovelace_amt},
                        "unit": "lovelace"
                    }},
                    "assets": [
                        {{
                            "policy_id": "{token_policy}",
                            "asset_name": "{asset_name}",
                            "quantity": {token_qty}
                        }}
                    ]
                }}
            ],
            "withdrawal": "self",
            "validity_interval": {{
                "invalid_hereafter": {{
                    "quantity": 3600,
                    "unit": "second"
                }}
            }},
            "encoding": "base16"
        }}"""
    )

    tx = cw_api.construct_transaction(wallet_id, payload)
    encoded_tx = tx.get("transaction")
    signed_tx = cw_api.sign_transaction(wallet_id, WALLET_PASSPHRASE, encoded_tx)
    tx_cbor = base64.b64decode(signed_tx.get("transaction")).hex()

    with ogmios.Client() as client:
        tx_id, _ = client.submit_transaction.execute(tx_cbor)


`Open this example on GitLab <https://gitlab.com/viperscience/ogmios-python/-/blob/main/examples/build_tx_cardanotools.py>`_