diff --git a/local-data-platform/local_data_platform/cron_flow.py b/local-data-platform/local_data_platform/cron_flow.py new file mode 100644 index 0000000..ccd5d82 --- /dev/null +++ b/local-data-platform/local_data_platform/cron_flow.py @@ -0,0 +1,75 @@ +def cron_flow(cron_expression: str, etl_function: callable, *args, **kwargs) -> None: + """ + Schedule an ETL (Extract, Transform, Load) process to run at specific intervals using a cron job. + + Args: + cron_expression (str): The cron expression that specifies the schedule for the ETL job. It follows the standard + cron format: "minute hour day_of_month month day_of_week". + Example: "0 2 * * *" for running the ETL job daily at 2 AM. + etl_function (callable): The function that executes the ETL process, which can be passed as a reference. + This function should handle the extract, transform, and load stages of the process. + *args: Additional positional arguments to pass to the ETL function. + **kwargs: Additional keyword arguments to pass to the ETL function. + + Returns: + None + + Raises: + ValueError: If the cron expression is invalid or if the ETL function is not callable. + Exception: If an error occurs during the scheduling or execution of the ETL job. + + Example: + cron_flow("0 0 * * 0", run_etl_process, source="data_source", target="data_target") + + Notes: + - This function requires the cron job to be set up and managed using a task scheduler (e.g., cron in Unix-like + systems or any equivalent scheduling tool). + - Ensure that the ETL function handles any errors internally, as the scheduling system may not handle exceptions + r + """ + print("I Orchestrate!") + + + + +def run_etl_process(source: str, target: str, transform_function: callable = None, *args, **kwargs) -> None: + """ + Execute the ETL (Extract, Transform, Load) process. + + This function orchestrates the three stages of an ETL process: + 1. Extract data from a source. + 2. Optionally transform the data using a transformation function. + 3. Load the transformed (or raw) data into the target destination. + + Args: + source (str): The data source from which to extract the data. It can be a file path, database connection string, + or API endpoint. + target (str): The destination where the data will be loaded. It can be a database, file path, or another storage + mechanism. + transform_function (callable, optional): A function that performs the transformation of the extracted data. + This function should accept the extracted data as input and return the transformed data. If no transformation + is needed, this argument can be left as `None` (default is `None`). + *args: Additional positional arguments to pass to the transformation function or loading process. + **kwargs: Additional keyword arguments to pass to the transformation function or loading process. + + Returns: + None + + Raises: + ValueError: If the source or target is invalid or if the transformation function does not return the expected output. + IOError: If an error occurs during data extraction or loading. + Exception: For any other issues that occur during the ETL process. + + Example: + run_etl_process(source="database_connection_string", + target="data_warehouse", + transform_function=transform_data, + batch_size=1000) + + Notes: + - The `transform_function` is optional. If provided, it should handle the logic for transforming the extracted data. + - This function assumes that the source and target formats are compatible with the extraction and loading logic + implemented in the ETL process. + - The actual implementation of extraction, transformation, and loading will depend on the specific needs of the + application (e.g., connecting to databases, reading/writing files, etc.). + """