The Current State of Error Logs

Oct 13, 2025 by pynkocean.com 47 views

Introduction

Error logs are a crucial component of any application, providing valuable insights into issues that may arise during execution. However, the current error log on an asset upload does not offer sufficient information about the uploaded asset. This article aims to address this limitation by exploring ways to enhance error logs and provide more detailed information about the uploaded asset.

The Current State of Error Logs

The current error log on an asset upload is limited in its information. For instance, when uploading the same asset twice, which results in an error due to a duplicate platform identifier, the error log appears as follows:

v1.3.20241030 2025-03-13 09:12:51.889 DEBUG connectionpool - _new_conn: Starting new HTTP connection (1): keycloak:8080
v1.3.20241030 2025-03-13 09:12:51.946 DEBUG connectionpool - _make_request: http://keycloak:8080 "POST /aiod-auth/realms/aiod/protocol/openid-connect/token/introspect HTTP/11" 200 786
INFO:     172.18.0.1:56544 - "POST /computational_assets/v1 HTTP/1.1" 200 OK
v1.3.20241030 2025-03-13 09:12:53.560 DEBUG connectionpool - _make_request: http://keycloak:8080 "POST /aiod-auth/realms/aiod/protocol/openid-connect/token/introspect HTTP/11" 200 786
v1.3.20241030 2025-03-13 09:12:53.580 DEBUG error_handling - http_exception_handler: {'reference': '2cf81bae8a154cc982588123f12e6a99', 'exception': "'409: There already exists a computational_asset with the same platform and platform_resource_identifier, with identifier=1.'", 'method': 'POST', 'path': '/computational_assets/v1', 'body': '<Data Stream with unknown content>'}

As can be seen, the error log lacks information about the uploaded asset, specifically the body data. This makes it challenging to diagnose and resolve issues related to asset uploads.

Enhancing Error Logs: A Solution

To address the limitation of the current error log, we can leverage the capabilities of FastAPI and Starlette to access the request body in an exception handler. This can be achieved by using the Request object and accessing its body attribute.

Accessing the Request Body in an Exception Handler

According to the FastAPI documentation, we can access the request body in an exception handler by using the Request object and accessing its body attribute. This can be achieved by modifying the exception handler to include the following code:

from fastapi import Request

# ...

async def http_exception_handler(request: Request, exc: HTTPException):
    # ...
    body = await request.body()
    # ...

By accessing the request body in the exception handler, we can provide more detailed information about the uploaded asset, making it easier to diagnose and resolve issues related to asset uploads.

Example Use Case

To illustrate the benefits of enhancing error logs, let's consider an example use case. Suppose we have an application that allows users to upload computational assets. When a user attempts to upload an asset that already exists, the application raises a 409 Conflict exception. In this scenario, the enhanced error log would provide more detailed information about the uploaded asset, including the body data.

v1.3.20241030 2025-03-13 09:12:53.580 DEBUG error_handling - http_exception_handler: {'reference': '2cf81bae8a154cc982588123f12e6a99', 'exception': "'409: There already exists a computational_asset with the same platform and platform_resource_identifier, with identifier=1.'", 'method': 'POST', 'path': '/computational_assets/v1', 'body': 'b\'<Data Stream with known content>\''}

As can be seen, the enhanced error log provides more detailed information about the uploaded asset, making it easier to diagnose and resolve issues related to asset uploads.

Conclusion

In conclusion, enhancing error logs for asset uploads is crucial for providing valuable insights into issues that may arise during execution. By leveraging the capabilities of FastAPI and Starlette, we can access the request body in an exception handler and provide more detailed information about the uploaded asset. This makes it easier to diagnose and resolve issues related to asset uploads, ultimately improving the overall user experience.

Useful Resources

For more information on custom request and route handling in FastAPI, please refer to the following resources:

Q: What is the current limitation of error logs for asset uploads?

A: The current error log on an asset upload does not provide sufficient information about the uploaded asset. Specifically, it lacks information about the body data, making it challenging to diagnose and resolve issues related to asset uploads.

Q: How can we enhance error logs for asset uploads?

A: We can leverage the capabilities of FastAPI and Starlette to access the request body in an exception handler. This can be achieved by modifying the exception handler to include the request body.

Q: What is the benefit of accessing the request body in an exception handler?

A: By accessing the request body in an exception handler, we can provide more detailed information about the uploaded asset, making it easier to diagnose and resolve issues related to asset uploads.

Q: How can we access the request body in an exception handler?

A: We can access the request body in an exception handler by using the Request object and accessing its body attribute. This can be achieved by modifying the exception handler to include the following code:

from fastapi import Request

# ...

async def http_exception_handler(request: Request, exc: HTTPException):
    # ...
    body = await request.body()
    # ...

Q: What is an example use case for enhancing error logs for asset uploads?

A: Suppose we have an application that allows users to upload computational assets. When a user attempts to upload an asset that already exists, the application raises a 409 Conflict exception. In this scenario, the enhanced error log would provide more detailed information about the uploaded asset, including the body data.

Q: How can we implement the enhanced error log in our application?

A: To implement the enhanced error log, we can modify the exception handler to include the request body. This can be achieved by modifying the exception handler to include the following code:

from fastapi import Request

# ...

async def http_exception_handler(request: Request, exc: HTTPException):
    # ...
    body = await request.body()
    # ...
    return {'reference': '2cf81bae8a154cc982588123f12e6a99', 'exception': exc.detail, 'method': request.method, 'path': request.path, 'body': body}

Q: What are the benefits of enhancing error logs for asset uploads?

A: The benefits of enhancing error logs for asset uploads include:

Improved diagnosis and resolution of issues related to asset uploads
More detailed information about the uploaded asset
Enhanced user experience

Q: What are some useful resources for learning more about custom request and route handling in FastAPI?

A: Some useful resources for learning more about custom request and route handling in FastAPI include:

By following the guidelines outlined in this article, developers can enhance error logs for asset uploads and provide more valuable insights into issues that may arise during execution.