Chia Password Coin Tutorial 5 Snippet 4

tutorial-5-snippet-4.py

@app.route('/spend', methods=('GET', 'POST'))
async def spend():
    await setup_blockchain_connection()

    # If a post request was made
    if request.method == 'POST':
        # Get variables from the form
        password = (await request.form)['password']
        address = (await request.form)['address']

        # Get Spend Bundle Parameters
        coin_reveal = create_coin_puzzle(
            create_coin_password_hash_from_string(password))
        coin_treehash = create_coin_treehash(
            create_coin_password_hash_from_string(password))
        coin_records = await full_node_rpc_client.get_coin_records_by_puzzle_hash(coin_treehash)

        # Let's spend the first available coin with this password
        # Note: Since all coins with the same password created with the puzzle in /password/password.clsp have the same
        #       puzzle_hash they will all be retrieved here. Even the ones that were NOT created by you!
        coin_to_spend = None
        for coin_record in coin_records:
            if not coin_record.spent:
                coin_to_spend = coin_record
                break

        # If there's no coin redirect back to the spend template
        if coin_to_spend == None:
            print("NO COIN AVAILABLE")
            # TODO: Show error on client
            return await render_template('spend.html')

        # Get the coin solution
        decoded_address = decode_puzzle_hash(address)
        coin_solution = solution_for_password(
            coin_to_spend.coin, password, decoded_address)

        # Put together our spend bundle
        tx_spend_bundle = SpendBundle(
            [
                CoinSpend(
                    coin_to_spend.coin,
                    coin_reveal,
                    coin_solution,
                )
            ],
            G2Element(),
        )

        # Try to send the spend bundle to the network
        await full_node_rpc_client.push_tx(tx_spend_bundle)

        # Redirect back to the home page on success
        return redirect(url_for('index'))

    # Show the spend form template
    # If GET method
    return await render_template('spend.html')