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function cancel_enhanced_workflow

Maturity: 50

Flask route handler that cancels an in-progress enhanced workflow by workflow ID, returning a JSON response indicating success or failure.

File:
/tf/active/vicechatdev/full_smartstat/app.py
Lines:
776 - 792
Complexity:
simple

Purpose

This endpoint provides a REST API interface to cancel running enhanced SQL workflows. It's designed to be called via POST request with a workflow_id parameter in the URL path. Currently implements a placeholder that logs the cancellation request but doesn't perform actual workflow termination logic. In production, this would integrate with a workflow management system to stop running processes.

Source Code

def cancel_enhanced_workflow(workflow_id):
    """Cancel an in-progress enhanced workflow"""
    try:
        # In a real implementation, you'd cancel the workflow here
        logger.info(f"Canceling enhanced workflow: {workflow_id}")
        
        return jsonify({
            'success': True,
            'message': 'Workflow canceled'
        })
        
    except Exception as e:
        logger.error(f"Error canceling workflow: {str(e)}")
        return jsonify({
            'success': False,
            'error': str(e)
        }), 500

Parameters

Name Type Default Kind
workflow_id - - positional_or_keyword

Parameter Details

workflow_id: String identifier for the workflow to be canceled. This should be a unique identifier (likely UUID) that was returned when the workflow was initially created or started. The parameter is extracted from the URL path by Flask's routing mechanism.

Return Value

Returns a Flask JSON response object. On success: returns a dictionary with 'success': True and 'message': 'Workflow canceled' with HTTP status 200. On error: returns a dictionary with 'success': False and 'error': <error_message> with HTTP status 500. The response is automatically serialized to JSON by Flask's jsonify function.

Dependencies

  • flask
  • logging
  • json
  • uuid
  • datetime
  • typing
  • pathlib
  • tempfile
  • base64
  • pandas
  • threading
  • time
  • werkzeug
  • os
  • shutil

Required Imports

from flask import Flask
from flask import jsonify
import logging

Usage Example

# Server-side Flask setup
from flask import Flask, jsonify
import logging

app = Flask(__name__)
logger = logging.getLogger(__name__)
logging.basicConfig(level=logging.INFO)

@app.route('/cancel_enhanced_workflow/<workflow_id>', methods=['POST'])
def cancel_enhanced_workflow(workflow_id):
    try:
        logger.info(f"Canceling enhanced workflow: {workflow_id}")
        return jsonify({
            'success': True,
            'message': 'Workflow canceled'
        })
    except Exception as e:
        logger.error(f"Error canceling workflow: {str(e)}")
        return jsonify({
            'success': False,
            'error': str(e)
        }), 500

# Client-side usage example
import requests

workflow_id = 'abc-123-def-456'
response = requests.post(f'http://localhost:5000/cancel_enhanced_workflow/{workflow_id}')
result = response.json()

if result['success']:
    print(f"Workflow canceled: {result['message']}")
else:
    print(f"Error: {result['error']}")

Best Practices

  • This is a stub implementation - in production, implement actual workflow cancellation logic that interacts with your workflow management system
  • Consider adding authentication/authorization checks before allowing workflow cancellation
  • Validate that the workflow_id exists and belongs to the requesting user before attempting cancellation
  • Add workflow state validation to ensure only cancellable workflows (e.g., 'running', 'pending') can be canceled
  • Consider returning more detailed information about the canceled workflow (e.g., current state, progress)
  • Implement idempotency - calling cancel on an already canceled workflow should not error
  • Add rate limiting to prevent abuse of the cancellation endpoint
  • Consider using a task queue (Celery, RQ) for actual workflow execution to enable proper cancellation
  • Log the user/session information along with the workflow_id for audit trails
  • Return appropriate HTTP status codes (e.g., 404 if workflow not found, 403 if unauthorized)

Tags

flask rest-api workflow-management cancellation http-post error-handling logging json-response web-endpoint workflow-control

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