Context.log Does Not Actually Accept Or Pass Forward Extra Kwargs

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Introduction

When working with the Context class in a logging context, it's essential to understand the behavior of its log method. The documentation suggests that the log method accepts additional keyword arguments (kwargs) through the **extra parameter. However, this is not the case, and attempting to pass extra kwargs will result in an error.

The Issue

The Context.log method is documented with the following signature:

await context.log(
    level: Log level (debug, info, warning, error)
    message: Log message
    logger_name: Optional logger name
    **extra: Additional structured data to include
)

However, when trying to use this method with extra kwargs, you'll encounter an error:

Context.log() got an unexpected keyword argument

This is because the log method does not actually accept any additional kwargs.

To Reproduce

To reproduce this issue, you can try using the context.info method with extra kwargs, like this:

await context.info(
    "request finished",
    channel_id=channel_id,
    status=response.get("ok"),
)

This will raise an error because the info method does not accept any additional kwargs.

Expected Behavior

The expected behavior is that the Context.log method should either be documented as not supporting additional structured data or the log message data should be structured to include the extra kwargs. For example, the log method could be implemented like this:

async def log(
    self,
    level: Literal["debug", "info", "warning", "error"],
    message: str,
    *,
    logger_name: str | None = None,
    **extra: Any
) -> None:
    """Send a log message to the client.

    Args:
        level: Log level (debug, info, warning, error)
        message: Log message
        logger_name: Optional logger name
        **extra: Additional structured data to include
    """
    log_data = {
        "message": message, **extra
    }
    await self.request_context.session.send_log_message(
        level=level, data=log_data, logger=logger_name
    )

This implementation would allow the log method to accept additional kwargs and structure the log message data accordingly.

Conclusion

In conclusion, the Context.log method does not actually accept or pass forward extra kwargs. This results in errors when trying to use the method with extra kwargs. To fix this issue, the log method should be either documented as not supporting additional structured data or the log message data should be structured to include the extra kwargs.

Recommendations

To avoid this issue, it's recommended to:

  1. Check the documentation of the Context.log method to see if it supports additional kwargs.
  2. If the method does not support additional kwargs, structure the log message data accordingly.
  3. If the method does support additional kwargs, ensure that the implementation is correct and does not raise an error.

Introduction

In our previous article, we discussed the issue with the Context.log method not accepting or passing forward extra kwargs. In this article, we'll provide a Q&A section to help you better understand the issue and how to resolve it.

Q: What is the issue with the Context.log method?

A: The issue is that the Context.log method does not actually accept or pass forward extra kwargs, despite being documented as supporting them. This results in errors when trying to use the method with extra kwargs.

Q: What happens when I try to use the Context.log method with extra kwargs?

A: When you try to use the Context.log method with extra kwargs, you'll encounter an error:

Context.log() got an unexpected keyword argument

This is because the log method does not actually accept any additional kwargs.

Q: Why is this an issue?

A: This is an issue because it can lead to unexpected behavior and errors in your code. If you're relying on the Context.log method to support extra kwargs, you may find that your code is not working as expected.

Q: How can I resolve this issue?

A: To resolve this issue, you can:

  1. Check the documentation of the Context.log method to see if it supports additional kwargs.
  2. If the method does not support additional kwargs, structure the log message data accordingly.
  3. If the method does support additional kwargs, ensure that the implementation is correct and does not raise an error.

Q: What is the expected behavior of the Context.log method?

A: The expected behavior of the Context.log method is that it should either be documented as not supporting additional structured data or the log message data should be structured to include the extra kwargs.

Q: How can I structure the log message data to include extra kwargs?

A: To structure the log message data to include extra kwargs, you can use a dictionary to store the extra data and then pass it to the log method. For example:

log_data = {
    "message": message, **extra
}
await self.request_context.session.send_log_message(
    level=level, data=log_data, logger=logger_name
)

Q: What are some best practices for using the Context.log method?

A: Some best practices for using the Context.log method include:

  1. Always check the documentation of the Context.log method to see if it supports additional kwargs.
  2. Structure the log message data accordingly to include extra kwargs.
  3. Ensure that the implementation of the log method is correct and does not raise an error.

Q: Can I use the Context.log method with other logging libraries?

A: Yes, you can use the Context.log method with other logging libraries. However, you should ensure that the implementation of the log method is correct and does not raise an error.

Q: What are some common use cases for the Context.log method?

A: Some common use cases for the Context.log method include:

  1. Logging user activity
  2. Logging system events
  3. Logging and exceptions

By following these best practices and use cases, you can effectively use the Context.log method to log important events in your application.