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Flask route handler that retrieves and displays a list of recent analysis sessions from the analysis service.

Purpose

This function serves as a web endpoint to display recent analysis sessions to users. It fetches session data from the analysis service and renders it in an HTML template. If an error occurs during retrieval, it logs the error, displays a flash message to the user, and redirects to the index page. This is part of a Flask web application for managing statistical analysis sessions.

Source Code

def list_sessions():
    """List recent sessions"""
    try:
        sessions = analysis_service.get_recent_sessions()
        return render_template('sessions.html', sessions=sessions)
        
    except Exception as e:
        logger.error(f"Error listing sessions: {str(e)}")
        flash(f"Error loading sessions: {str(e)}", 'error')
        return redirect(url_for('index'))

Return Value

Returns a rendered HTML template ('sessions.html') with sessions data on success, or redirects to the index page on error. The return type is a Flask Response object containing either the rendered template or a redirect response.

Dependencies

• flask
• logging
• pandas
• werkzeug
• pathlib

Required Imports

from flask import Flask
from flask import render_template
from flask import redirect
from flask import url_for
from flask import flash
import logging

Usage Example

from flask import Flask, render_template, redirect, url_for, flash
import logging
from services import StatisticalAnalysisService

app = Flask(__name__)
app.secret_key = 'your-secret-key'
logger = logging.getLogger(__name__)
analysis_service = StatisticalAnalysisService()

@app.route('/sessions')
def list_sessions():
    """List recent sessions"""
    try:
        sessions = analysis_service.get_recent_sessions()
        return render_template('sessions.html', sessions=sessions)
    except Exception as e:
        logger.error(f"Error listing sessions: {str(e)}")
        flash(f"Error loading sessions: {str(e)}", 'error')
        return redirect(url_for('index'))

if __name__ == '__main__':
    app.run(debug=True)

Best Practices

• Always wrap route handlers in try-except blocks to handle unexpected errors gracefully
• Use flash messages to communicate errors to users in a user-friendly way
• Log errors with appropriate context for debugging and monitoring
• Redirect to a safe page (like index) when errors occur to prevent broken user experience
• Ensure the analysis_service.get_recent_sessions() method is properly implemented and returns expected data structure
• The sessions.html template should handle cases where sessions list might be empty
• Consider adding pagination if the number of sessions can grow large
• Consider adding authentication/authorization checks before allowing access to sessions
• Use more specific exception handling instead of catching all exceptions for better error diagnosis

Tags

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