Get Mempool Contents
====================

This module submits a transaction, reads the contents of the mempool, and then waits for the mempool to empty: ::

    import ogmios
    import pycardano as pyc

    def submit_transaction():
        """Submit a transaction so we have something in the mempool."""
        with pyc.OgmiosV6ChainContext("localhost", 1337) as context:
            network = pyc.Network.TESTNET
            psk = pyc.PaymentExtendedSigningKey.load("./tests/test_wallet/test_addr0.skey")
            ssk = pyc.StakeExtendedSigningKey.load("./tests/test_wallet/test_stake.skey")
            pvk = pyc.PaymentVerificationKey.from_signing_key(psk)
            svk = pyc.StakeVerificationKey.from_signing_key(ssk)
            address = pyc.Address(pvk.hash(), svk.hash(), network)
            builder = pyc.TransactionBuilder(context)

            builder.add_input_address(address)
            builder.add_output(
                pyc.TransactionOutput(
                    address,
                    pyc.Value.from_primitive(
                        [
                            10000000,
                        ]
                    ),
                )
            )
            signed_tx = builder.build_and_sign([psk], change_address=address)
            context.submit_tx(signed_tx)


    def get_mempool_contents():
        """Get the contents of the mempool and wait for it to be empty."""
        with ogmios.Client() as client:
            mempool_txs = ogmios.utils.get_mempool_transactions(client)
            print(f"Mempool has {len(mempool_txs)} transactions:\n{mempool_txs}")

            # Optionally, turn the TX dicts into PyCardano TransactionBody objects
            for tx in mempool_txs:
                pyc_tx = ogmios.utils.tx_dict_to_pycardano_tx(tx)

            print("Waiting for mempool to be empty...")
            ogmios.utils.wait_for_empty_mempool(client)
            print("Mempool is empty!")


    if __name__ == "__main__":
        submit_transaction()
        get_mempool_contents()


Example output:

.. image:: ../_static/get_mempool_contents.png

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