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Astro SDK allows rapid and clean development of {Extract, Load, Transform} workflows using Python and SQL, powered by Apache Airflow.

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<h1 align="center">
  astro
</h1>
  <h3 align="center">
  workflows made easy<br><br>
</h3>

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**Astro Python SDK** is a Python SDK for rapid development of extract, transform, and load workflows in [Apache Airflow](https://airflow.apache.org/). It allows you to express your workflows as a set of data dependencies without having to worry about ordering and tasks. The Astro Python SDK is maintained by [Astronomer](https://astronomer.io).

## Prerequisites

- Apache Airflow >= 2.1.0.

## Install

The Astro Python SDK is available at [PyPI](https://pypi.org/project/astro-sdk-python/). Use the standard Python
[installation tools](https://packaging.python.org/en/latest/tutorials/installing-packages/).

To install a cloud-agnostic version of the SDK, run:

```shell
pip install astro-sdk-python
```

You can also install dependencies for using the SDK with popular cloud providers:

```shell
pip install astro-sdk-python[amazon,google,snowflake,postgres]
```

## Quickstart
1. Ensure that your Airflow environment is set up correctly by running the following commands:

```shell
    export AIRFLOW_HOME=`pwd`
    airflow db init
    ```

> **Note:**
   > - `AIRFLOW__CORE__ENABLE_XCOM_PICKLING` no longer needs to be enabled from astro-sdk-python release 1.2 and above.
   > - For airflow version < 2.5 and astro-sdk-python release < 1.3 Users can either use a custom XCom backend [AstroCustomXcomBackend](https://astro-sdk-python.readthedocs.io/en/latest/guides/xcom_backend.html#xcom-backend) with Xcom pickling disabled (or) enable Xcom pickling.
   > - For airflow version >= 2.5 and astro-sdk-python release >= 1.3.3 Users can either use [Airflow's Xcom backend](https://astro-sdk-python.readthedocs.io/en/latest/guides/xcom_backend.html#airflow_xcom_backend) with Xcom pickling disabled (or) enable Xcom pickling.

The data format used by pickle is Python-specific. This has the advantage that there are no restrictions imposed by external standards such as JSON or XDR (which can’t represent pointer sharing); however it means that non-Python programs may not be able to reconstruct pickled Python objects.

Read more: [enable_xcom_pickling](https://airflow.apache.org/docs/apache-airflow/stable/configurations-ref.html#enable-xcom-pickling) and [pickle](https://docs.python.org/3/library/pickle.html#comparison-with-json):

2. Create a SQLite database for the example to run with:

```shell
    # The sqlite_default connection has different host for MAC vs. Linux
    export SQL_TABLE_NAME=`airflow connections get sqlite_default -o yaml | grep host | awk '{print $2}'`
    sqlite3 "$SQL_TABLE_NAME" "VACUUM;"
    ```

3. Copy the following workflow into a file named `calculate_popular_movies.py` and add it to the `dags` directory of your Airflow project:

https://github.com/astronomer/astro-sdk/blob/d5aa768b2d4bca72ef98f8d533fe3f99624b172f/example_dags/calculate_popular_movies.py#L1-L37

Alternatively, you can download `calculate_popular_movies.py`
   ```shell
    curl -O https://raw.githubusercontent.com/astronomer/astro-sdk/main/example_dags/calculate_popular_movies.py
   ```

4. Run the example DAG:

```sh
    airflow dags test calculate_popular_movies `date -Iseconds`
    ```

5. Check the result of your DAG by running:

```shell
    sqlite3 "$SQL_TABLE_NAME" "select * from top_animation;" ".exit"
    ```

You should see the following output:

## Supported technologies

## Available operations

The following are some key functions available in the SDK:

- [`load_file`](https://astro-sdk-python.readthedocs.io/en/stable/astro/sql/operators/load_file.html): Load a given file into a SQL table
- [`transform`](https://astro-sdk-python.readthedocs.io/en/stable/astro/sql/operators/transform.html): Applies a SQL select statement to a source table and saves the result to a destination table
- [`drop_table`](https://astro-sdk-python.readthedocs.io/en/stable/astro/sql/operators/drop_table.html): Drops a SQL table
- [`run_raw_sql`](https://astro-sdk-python.readthedocs.io/en/stable/astro/sql/operators/raw_sql.html): Run any SQL statement without handling its output
- [`append`](https://astro-sdk-python.readthedocs.io/en/stable/astro/sql/operators/append.html): Insert rows from the source SQL table into the destination SQL table, if there are no conflicts
- [`merge`](https://astro-sdk-python.readthedocs.io/en/stable/astro/sql/operators/merge.html): Insert rows from the source SQL table into the destination SQL table, depending on conflicts:
  - `ignore`: Do not add rows that already exist
  - `update`: Replace existing rows with new ones
- [`export_file`](https://astro-sdk-python.readthedocs.io/en/stable/astro/sql/operators/export.html): Export SQL table rows into a destination file
- [`dataframe`](https://astro-sdk-python.readthedocs.io/en/stable/astro/sql/operators/dataframe.html): Export given SQL table into in-memory Pandas data-frame

For a full list of available operators, see the [SDK reference documentation](https://astro-sdk-python.readthedocs.io/en/stable/operators.html).

## Documentation

The documentation is a work in progress--we aim to follow the [Diátaxis](https://diataxis.fr/) system:

- **[Getting Started Tutorial](https://docs.astronomer.io/tutorials/astro-python-sdk)**: A hands-on introduction to the Astro Python SDK
- **How-to guides**: Simple step-by-step user guides to accomplish specific tasks
- **[Reference guide](https://astro-sdk-python.readthedocs.io/)**: Commands, modules, classes and methods
- **Explanation**: Clarification and discussion of key decisions when designing the project

## Changelog

The Astro Python SDK follows semantic versioning for releases. Check the [changelog](python-sdk/docs/CHANGELOG.md) for the latest changes.

## Release managements

To learn more about our release philosophy and steps, see [Managing Releases](python-sdk/docs/development/RELEASE.md).

## Contribution guidelines

All contributions, bug reports, bug fixes, documentation improvements, enhancements, and ideas are welcome.

Read the [Contribution Guideline](python-sdk/docs/development/CONTRIBUTING.md) for a detailed overview on how to contribute.

Contributors and maintainers should abide by the [Contributor Code of Conduct](CODE_OF_CONDUCT.md).

## License

[Apache Licence 2.0](LICENSE)

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