feat: Add error handling, data validation, and improved comments #53
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- Wrapped database interactions in try-except blocks to handle errors and log them appropriately. - Ensured proper HTTP status codes for various scenarios (e.g., 400 for bad requests, 500 for server errors). - Added validation to check for missing input in the `/submit` route. - Improved data formatting when fetching messages to ensure proper rendering. - Enhanced code readability by adding comments explaining key sections and purpose of functions.
WalkthroughThe changes in the pull request primarily focus on enhancing error handling and improving documentation within the Changes
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Actionable comments posted: 2
🧹 Outside diff range and nitpick comments (1)
app.py (1)
22-34: Use theloggingmodule instead ofUsing the
loggingmodule offers better control over logging levels and is more suitable for production environments than print statements.Consider applying this change:
+import logging +logging.basicConfig(level=logging.ERROR) def init_db(): """Initializes the database by creating the necessary table if it doesn't exist. This function ensures that the database is prepared for use by the application. It creates a 'messages' table if it does not already exist.""" try: with app.app_context(): cur = mysql.connection.cursor() cur.execute(''' CREATE TABLE IF NOT EXISTS messages ( id INT AUTO_INCREMENT PRIMARY KEY, message TEXT NOT NULL ); ''') mysql.connection.commit() cur.close() except Exception as e: - print(f"Error initializing database: {e}") + logging.error(f"Error initializing database: {e}")
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📒 Files selected for processing (1)
app.py(2 hunks)
🔇 Additional comments (10)
app.py (10)
7-9: Well-documented MySQL configuration
The added comments improve the clarity and maintainability of the MySQL configuration settings.
19-21: Good addition of docstrings for init_db function
Providing a docstring enhances code readability and helps other developers understand the purpose of the function.
38-38: Good addition of docstring for index function
Adding a docstring improves code documentation and helps others understand the function's purpose.
39-48: Proper error handling in index function
Wrapping database operations in a try-except block and returning appropriate HTTP status codes enhances the application's robustness.
45-45: Efficient list comprehension for messages
Transforming the fetched messages into a list of strings ensures correct rendering in the template.
52-52: Good addition of docstring for submit function
Including a docstring enhances readability and provides clear documentation of the function's purpose.
54-55: Appropriate input validation for new_message
Checking for missing input and returning a 400 status code is a good practice for robust API design.
57-64: Proper error handling in submit function
Using a try-except block around the database insertion and returning appropriate HTTP status codes improves error management.
67-67: Initialization comment enhances clarity
Adding a comment before initializing the database helps others understand the application's startup process.
37-37: Verify the function rename from hello to index
Ensure that all references to the hello function are updated to index across the codebase, including templates and any external calls.
Run the following script to verify:
✅ Verification successful
Function rename from hello to index appears safe
The codebase scan shows that there are no direct function calls to hello() in any Python files. The only occurrence of "hello" is in the template's heading text, which is unrelated to the function name. The function rename appears to be safe as it doesn't impact any other parts of the codebase.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Find any references to the old `hello` function.
# Search for 'hello(' in Python files excluding 'app.py'
rg 'hello\(' --glob '!app.py' --type py
# Search for 'hello' in HTML templates
rg 'hello' --glob '*.html' templates/
Length of output: 228
Script:
#!/bin/bash
# Let's first check if there are any Python files and template directories
fd -e py
fd -t d templates
# Then let's search for any occurrence of 'hello' in all files to catch any potential references
rg -i 'hello'
# Let's also check the routes and URL patterns
ast-grep --pattern 'route("$_")'
Length of output: 205
| cur.close() | ||
| return jsonify({'message': new_message}), 201 | ||
| except Exception as e: | ||
| return jsonify({"error": f"Failed to insert message: {e}"}), 500 |
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Avoid exposing internal error details to clients
Returning detailed exception messages may reveal sensitive information. Log the exception and return a generic error message instead.
Consider applying this change:
except Exception as e:
- return jsonify({"error": f"Failed to insert message: {e}"}), 500
+ logging.error(f"Failed to insert message: {e}")
+ return jsonify({"error": "An internal server error occurred."}), 500Committable suggestion skipped: line range outside the PR's diff.
| messages = [msg[0] for msg in messages] | ||
| return render_template('index.html', messages=messages) | ||
| except Exception as e: | ||
| return jsonify({"error": f"Failed to fetch messages: {e}"}), 500 |
There was a problem hiding this comment.
Avoid exposing internal error details to clients
Returning exception details in error responses may expose sensitive information. Consider logging the exception and returning a generic error message.
Consider applying this change:
except Exception as e:
- return jsonify({"error": f"Failed to fetch messages: {e}"}), 500
+ logging.error(f"Failed to fetch messages: {e}")
+ return jsonify({"error": "An internal server error occurred."}), 500Committable suggestion skipped: line range outside the PR's diff.
/submitroute.Summary by CodeRabbit
New Features
Bug Fixes
messagefield in the database is marked asNOT NULL.