Stats endpoint

[morgante]

Add a /stats REST endpoint that explains how many items are currently in the Redis cache.

I want to be able to evaluate cache performance.

@autopilot Please do this.

[codeautopilot]

Potential solution

To implement the /stats endpoint, we will need to add a new route to the Flask application that interacts with the Redis cache to retrieve the number of items stored. The solution involves using the Redis command appropriate for the data structure used to store cache items. The documentation will also be updated to reflect this new endpoint.

How to implement

In the cookbook/codellama-server/main.py file, we will:

1. Import the necessary modules (redis and dotenv).
2. Load environment variables using dotenv.load_dotenv().
3. Initialize the Redis connection with the appropriate host, port, and database index.
4. Define a new route /stats that handles GET requests and uses the Redis command to retrieve the count of items.
5. Return the count in a JSON response or an error message if an exception occurs.

Here's the implementation:

from flask import Flask, jsonify
import os
import redis
import dotenv

dotenv.load_dotenv()

app = Flask(__name__)

# Initialize Redis connection
redis_host = os.getenv('REDIS_HOST', 'localhost')
redis_port = int(os.getenv('REDIS_PORT', 6379))
redis_db = int(os.getenv('REDIS_DB', 0))
redis_client = redis.StrictRedis(host=redis_host, port=redis_port, db=redis_db)

@app.route('/stats', methods=['GET'])
def stats():
    try:
        # Replace 'cache_items' with the actual key used for storing items in Redis
        item_count = redis_client.hlen('cache_items')
        return jsonify({'item_count': item_count}), 200
    except Exception as e:
        return jsonify({'error': str(e)}), 500

# ... existing code ...

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=4000)

In the docs/my-website/docs/proxy_server.md file, we will:

1. Add a new section titled "Statistics Endpoint".
2. Describe the purpose of the /stats endpoint.
3. Provide an example of how to use the endpoint.
4. Mention any authentication requirements.

Here's the documentation update:

## Statistics Endpoint

The `/stats` endpoint provides insights into the cache performance by reporting the number of items currently stored in the Redis cache. This can help in evaluating the effectiveness of the caching strategy.

### Usage

To retrieve cache statistics, issue a GET request to the `/stats` endpoint:

```shell
curl http://0.0.0.0:4000/stats

You will receive a response in JSON format with the count of items:

{
  "item_count": 1234
}

Authentication

Currently, there is no authentication required to access the /stats endpoint. This may be subject to change in future releases, so please consult the latest documentation for updates on access control.

Ensure that the new section is added in a logical place within the existing documentation structure and that the formatting is consistent with the rest of the document.
<!--- REPLY FORMAT END -->

[Click here to create a Pull Request with the proposed solution](https://api.codeautopilot.com/create-pr?task=19803&hash=f51918e544ceb393e1c7ff3341f022bf5e717fbac8c6a6d85d81d32ebe92acbc)

**Files used for this task:**

<details>
  <summary>Changes on cookbook/codellama-server/main.py</summary>
  
  To solve the task of adding a `/stats` endpoint to the Flask application, we need to implement a new route that interacts with the Redis cache to retrieve the count of items stored in it. Here's a practical proposal for how to achieve this:

1. Import the Redis library and initialize a Redis connection using environment variables for the Redis host, port, and any other necessary configuration.

2. Create a new route `/stats` that will handle GET requests.

3. Inside the `/stats` route, use the Redis connection to retrieve the count of items. Redis does not have a direct command to count all items, but if you are using a data structure like a hash, set, or sorted set, you can use the appropriate command (e.g., `HLEN`, `SCARD`, `ZCARD`) to get the count.

4. Return the count as a JSON response.

Here's how the code could look after implementing the above steps:

```python
from flask import Flask, jsonify
from flask_cors import CORS
import os
import redis
import dotenv

dotenv.load_dotenv()

app = Flask(__name__)
CORS(app)

# Initialize Redis connection
redis_host = os.getenv('REDIS_HOST', 'localhost')
redis_port = os.getenv('REDIS_PORT', 6379)
redis_db = os.getenv('REDIS_DB', 0)
redis_client = redis.StrictRedis(host=redis_host, port=redis_port, db=redis_db)

@app.route('/stats', methods=['GET'])
def stats():
    try:
        # Assuming that the Redis cache stores items in a hash called 'cache_items'
        item_count = redis_client.hlen('cache_items')
        return jsonify({'item_count': item_count}), 200
    except Exception as e:
        return jsonify({'error': str(e)}), 500

# ... existing code ...

if __name__ == "__main__":
    from waitress import serve
    serve(app, host="0.0.0.0", port=4000, threads=500)

Please note that the above code assumes that the Redis cache stores items in a hash named 'cache_items'. You will need to adjust the Redis command (hlen in this case) and the key name based on how the cache is actually structured in your application.

Also, ensure that the Redis environment variables (REDIS_HOST, REDIS_PORT, REDIS_DB) are set in your .env file or in your environment before running the application.

Changes on docs/my-website/docs/proxy_server.md

To address the task of updating the documentation to include information about the new /stats endpoint, you should add a new section in the proxy_server.md file that describes the purpose and usage of the /stats endpoint. Here's a practical proposal for the changes to be made to the documentation:

1. Add a new section titled "Statistics Endpoint" or "Cache Performance".
2. Explain the purpose of the /stats endpoint, which is to provide information on how many items are currently in the Redis cache.
3. Provide an example of how to use the endpoint, including the HTTP method and the expected response format.
4. Mention any authentication or permissions required to access the /stats endpoint, if applicable.

Here's an example of how the new section could look:

## Statistics Endpoint

The `/stats` endpoint allows users to monitor the performance of the cache by retrieving the current count of items stored in the Redis cache. This information can be useful for understanding the cache utilization and optimizing cache-related operations.

### Usage

To get the cache statistics, send a GET request to the `/stats` endpoint:

```shell
curl http://0.0.0.0:8000/stats

The response will be a JSON object containing the count of items:

{
  "item_count": 1234
}

Note: Replace http://0.0.0.0:8000 with the actual base URL of your proxy server if it's different.

Authentication

No authentication is required to access the /stats endpoint in the current configuration. However, this may change in future updates, so please refer to the latest documentation for any changes to access control.

Make sure to place this new section in an appropriate location within the `proxy_server.md` file, such as after the "Advanced" section or before the "Support/ talk with founders" section, depending on the logical flow of the document.

Remember to review the entire document to ensure that the new section fits seamlessly with the existing content and that there are no formatting issues. After updating the documentation, commit the changes with a clear commit message, such as "Add documentation for the new /stats endpoint".
  
</details>



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