156 lines
4.1 KiB
Python
156 lines
4.1 KiB
Python
#!/usr/bin/env python3
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"""
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Template for creating API migration scripts.
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This module provides a template for creating scripts to migrate APIs
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between different versions while maintaining backward compatibility.
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It includes functions for loading data, transforming data, and saving data
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in the new format, along with error handling and logging.
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"""
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import argparse
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import json
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import logging
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import os
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import sys
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# Configure logging
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logging.basicConfig(
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level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s"
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)
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class MigrationError(Exception):
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"""Custom exception for migration-related errors."""
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pass
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def load_data(input_file):
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"""
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Loads data from a JSON file.
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Args:
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input_file (str): Path to the input JSON file.
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Returns:
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dict: The loaded data as a dictionary.
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Raises:
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MigrationError: If the file cannot be opened or parsed.
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"""
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try:
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with open(input_file, "r") as f:
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data = json.load(f)
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return data
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except FileNotFoundError:
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raise MigrationError(f"Input file not found: {input_file}")
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except json.JSONDecodeError:
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raise MigrationError(f"Invalid JSON format in file: {input_file}")
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except Exception as e:
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raise MigrationError(f"Error loading data from {input_file}: {e}")
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def transform_data(data):
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"""
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Transforms the data from the old format to the new format.
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This is where the core migration logic should be implemented.
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Args:
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data (dict): The data in the old format.
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Returns:
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dict: The data in the new format.
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Raises:
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MigrationError: If there is an error during the transformation.
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"""
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try:
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# Example transformation: Add a version field
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transformed_data = data.copy()
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transformed_data["version"] = "2.0" # Example version
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# Add your transformation logic here
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return transformed_data
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except Exception as e:
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raise MigrationError(f"Error transforming data: {e}")
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def save_data(data, output_file):
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"""
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Saves the transformed data to a JSON file.
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Args:
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data (dict): The transformed data.
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output_file (str): Path to the output JSON file.
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Raises:
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MigrationError: If the file cannot be written to.
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"""
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try:
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with open(output_file, "w") as f:
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json.dump(data, f, indent=4)
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except Exception as e:
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raise MigrationError(f"Error saving data to {output_file}: {e}")
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def migrate_api(input_file, output_file):
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"""
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Migrates the API data from the old format to the new format.
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Args:
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input_file (str): Path to the input JSON file.
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output_file (str): Path to the output JSON file.
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"""
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try:
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logging.info(f"Loading data from {input_file}...")
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data = load_data(input_file)
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logging.info("Transforming data...")
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transformed_data = transform_data(data)
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logging.info(f"Saving data to {output_file}...")
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save_data(transformed_data, output_file)
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logging.info("API migration completed successfully.")
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except MigrationError as e:
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logging.error(f"API migration failed: {e}")
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sys.exit(1)
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def main():
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"""
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Main function to parse arguments and run the migration.
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"""
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parser = argparse.ArgumentParser(
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description="Migrate API data between versions."
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)
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parser.add_argument(
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"input_file", help="Path to the input JSON file (old format)."
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)
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parser.add_argument(
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"output_file", help="Path to the output JSON file (new format)."
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)
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args = parser.parse_args()
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migrate_api(args.input_file, args.output_file)
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if __name__ == "__main__":
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# Example usage:
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# Create a dummy input file
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if not os.path.exists("input.json"):
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with open("input.json", "w") as f:
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json.dump({"name": "Example API", "version": "1.0"}, f, indent=4)
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# Run the migration
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try:
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main()
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except SystemExit:
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# Handle argparse exit (e.g., when -h is used)
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pass
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except Exception as e:
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logging.error(f"An unexpected error occurred: {e}")
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sys.exit(1) |