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Create stand-alone transaction

In this guide, we will generate some wealth for the Fetch.ai testnet and create a standalone transaction. After the completion of the transaction, we get the transaction digest. With this we can search for the transaction on the block explorer

This guide requires the aea-ledger-fetchai plug-in installed in your Python environment: 

pip install aea-ledger-fetchai

First, import the python and application specific libraries and set the static variables.

import logging

from aea_ledger_fetchai import FetchAICrypto

from aea.crypto.helpers import create_private_key, try_generate_testnet_wealth
from aea.crypto.ledger_apis import LedgerApis
from aea.crypto.wallet import Wallet


logger = logging.getLogger("aea")
logging.basicConfig(level=logging.INFO)

FETCHAI_PRIVATE_KEY_FILE_1 = "fetchai_private_key_1.txt"
FETCHAI_PRIVATE_KEY_FILE_2 = "fetchai_private_key_2.txt"

Create the private keys

    # Create a private keys
    create_private_key(
        FetchAICrypto.identifier, private_key_file=FETCHAI_PRIVATE_KEY_FILE_1
    )
    create_private_key(
        FetchAICrypto.identifier, private_key_file=FETCHAI_PRIVATE_KEY_FILE_2
    )

Create the wallets

Once we created the private keys we need to generate the wallets.

    # Set up the wallets
    wallet_1 = Wallet({FetchAICrypto.identifier: FETCHAI_PRIVATE_KEY_FILE_1})
    wallet_2 = Wallet({FetchAICrypto.identifier: FETCHAI_PRIVATE_KEY_FILE_2})

Generate wealth

Since we want to send funds from wallet_1 to wallet_2, we need to generate some wealth for the wallet_1. We can do this with the following code 

    # Generate some wealth
    try_generate_testnet_wealth(
        FetchAICrypto.identifier, wallet_1.addresses[FetchAICrypto.identifier]
    )

Send transaction

Finally, we create a transaction that sends the funds to the wallet_2

    # Create the transaction and send it to the ledger.
    tx_nonce = LedgerApis.generate_tx_nonce(
        FetchAICrypto.identifier,
        wallet_2.addresses.get(FetchAICrypto.identifier),
        wallet_1.addresses.get(FetchAICrypto.identifier),
    )
    transaction = LedgerApis.get_transfer_transaction(
        identifier=FetchAICrypto.identifier,
        sender_address=wallet_1.addresses.get(FetchAICrypto.identifier),
        destination_address=wallet_2.addresses.get(FetchAICrypto.identifier),
        amount=1,
        tx_fee=1,
        tx_nonce=tx_nonce,
    )
    signed_transaction = wallet_1.sign_transaction(
        FetchAICrypto.identifier, transaction
    )
    transaction_digest = LedgerApis.send_signed_transaction(
        FetchAICrypto.identifier, signed_transaction
    )

    logger.info("Transaction complete.")
    logger.info("The transaction digest is {}".format(transaction_digest))
Stand-alone transaction full code 
import logging

from aea_ledger_fetchai import FetchAICrypto

from aea.crypto.helpers import create_private_key, try_generate_testnet_wealth
from aea.crypto.ledger_apis import LedgerApis
from aea.crypto.wallet import Wallet


logger = logging.getLogger("aea")
logging.basicConfig(level=logging.INFO)

FETCHAI_PRIVATE_KEY_FILE_1 = "fetchai_private_key_1.txt"
FETCHAI_PRIVATE_KEY_FILE_2 = "fetchai_private_key_2.txt"


def run():
    """Run demo."""

    # Create a private keys
    create_private_key(
        FetchAICrypto.identifier, private_key_file=FETCHAI_PRIVATE_KEY_FILE_1
    )
    create_private_key(
        FetchAICrypto.identifier, private_key_file=FETCHAI_PRIVATE_KEY_FILE_2
    )

    # Set up the wallets
    wallet_1 = Wallet({FetchAICrypto.identifier: FETCHAI_PRIVATE_KEY_FILE_1})
    wallet_2 = Wallet({FetchAICrypto.identifier: FETCHAI_PRIVATE_KEY_FILE_2})

    # Generate some wealth
    try_generate_testnet_wealth(
        FetchAICrypto.identifier, wallet_1.addresses[FetchAICrypto.identifier]
    )

    logger.info(
        "Sending amount to {}".format(wallet_2.addresses.get(FetchAICrypto.identifier))
    )

    # Create the transaction and send it to the ledger.
    tx_nonce = LedgerApis.generate_tx_nonce(
        FetchAICrypto.identifier,
        wallet_2.addresses.get(FetchAICrypto.identifier),
        wallet_1.addresses.get(FetchAICrypto.identifier),
    )
    transaction = LedgerApis.get_transfer_transaction(
        identifier=FetchAICrypto.identifier,
        sender_address=wallet_1.addresses.get(FetchAICrypto.identifier),
        destination_address=wallet_2.addresses.get(FetchAICrypto.identifier),
        amount=1,
        tx_fee=1,
        tx_nonce=tx_nonce,
    )
    signed_transaction = wallet_1.sign_transaction(
        FetchAICrypto.identifier, transaction
    )
    transaction_digest = LedgerApis.send_signed_transaction(
        FetchAICrypto.identifier, signed_transaction
    )

    logger.info("Transaction complete.")
    logger.info("The transaction digest is {}".format(transaction_digest))


if __name__ == "__main__":
    run()
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