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Flask route handler that retrieves and displays an analysis session by its ID, rendering the session details in a template or redirecting on error.

Purpose

This function serves as a web endpoint to view a specific analysis session. It fetches session summary data from the analysis service, handles success/failure cases, and renders the appropriate template or redirects to the index page with error messages. It's part of a Flask web application for managing and viewing statistical analysis sessions.

Source Code

def view_session(session_id):
    """View analysis session"""
    try:
        summary = analysis_service.get_session_summary(session_id)
        
        if not summary['success']:
            flash(f"Session not found: {session_id}", 'error')
            return redirect(url_for('index'))
        
        return render_template('session.html', 
                             session_data=summary,
                             session_id=session_id)
        
    except Exception as e:
        logger.error(f"Error viewing session: {str(e)}")
        flash(f"Error loading session: {str(e)}", 'error')
        return redirect(url_for('index'))

Parameters

Parameter Details

session_id: String identifier for the analysis session to retrieve. This is extracted from the URL path parameter and used to query the analysis service for session details. Expected to be a unique identifier (likely UUID format) that corresponds to an existing analysis session.

Return Value

Returns a Flask Response object. On success, renders 'session.html' template with session_data (summary dictionary) and session_id context variables. On failure (session not found or exception), redirects to the 'index' route after displaying a flash message. The function does not have explicit return type annotation but returns either render_template() or redirect() results.

Dependencies

• flask
• logging
• werkzeug

Required Imports

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

Usage Example

# This function is used as a Flask route handler
# Assuming Flask app setup:

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('/session/<session_id>')
def view_session(session_id):
    try:
        summary = analysis_service.get_session_summary(session_id)
        
        if not summary['success']:
            flash(f"Session not found: {session_id}", 'error')
            return redirect(url_for('index'))
        
        return render_template('session.html', 
                             session_data=summary,
                             session_id=session_id)
        
    except Exception as e:
        logger.error(f"Error viewing session: {str(e)}")
        flash(f"Error loading session: {str(e)}", 'error')
        return redirect(url_for('index'))

# Access via URL: http://localhost:5000/session/abc-123-def-456

Best Practices

• Always ensure the analysis_service is properly initialized before the route is accessed
• The function expects analysis_service.get_session_summary() to return a dictionary with a 'success' key
• Flash messages are used for user feedback, ensure Flask session is properly configured
• Error handling catches all exceptions to prevent application crashes
• Logger should be configured at application startup for proper error tracking
• The session.html template must be designed to accept session_data and session_id variables
• Consider adding authentication/authorization checks before allowing session access
• Session IDs should be validated for format before querying the service to prevent injection attacks
• The redirect to 'index' assumes that route exists and is accessible

Tags

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