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Discover how to customize your `OmniAuth` logging in a Rails 5 application by directing error logs to `Rollbar` while keeping other log levels with `Rails.logger`.
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Configuring OmniAuth Logger for Dual Logging in Ruby on Rails

Managing logs in your Ruby on Rails application is crucial for debugging and maintaining the health of your app. When integrating authentication through OmniAuth, you may want to set up logging that behaves differently based on severity levels. For instance, you might want all error logs to be reported to Rollbar for more critical error tracking, while general logs are maintained by the standard Rails logger.

In this guide, we’ll walk through how to configure your OmniAuth logger to achieve this dual logging approach efficiently. Let’s break it down!

The Challenge

In your Rails 5 application using OmniAuth, you've attached the logger to Rails.logger as shown below:

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However, you're looking to change the behavior so that:

When the log level is error: Direct logs to Rollbar.

For all other log levels: Keep using Rails.logger.

The question arises: Is there a way to achieve this? Thankfully, the answer is yes!

The Solution: Creating a Proxy Logger

To address this requirement, you can create a custom class called a Proxy Logger, which will intelligently delegate logging based on the severity level. Here’s how you can implement it:

Step 1: Define the Proxy Logger

You will need to create a class that will manage the logging behavior. This class will delegate error logging to Rollbar while directing all other logs to Rails.logger. Here’s how you can set it up:

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Breakdown of the Code

Delegation: By using the delegate method, we specify that any calls to error should be forwarded to the @ error_logger, which will be our Rollbar logger.

Fallback Logging: The delegate_missing_to allows any other logging method calls that are not explicitly defined (like info, warn, etc.) to be forwarded to Rails.logger by default.

Step 2: Configure OmniAuth to Use the Proxy Logger

With the proxy logger defined, the next step is to configure OmniAuth to make use of this new logger. Implement this in your initializer setup:

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Why This Method Works

This approach provides a clean and effective way to direct logs based on their severity. It also maintains clarity and separation of concerns, as you don’t have to modify the core logging behavior of Rails or OmniAuth directly. Instead, you’re simply plugging in your custom logger that adheres to the existing logging paradigm.

Conclusion

Setting up custom logging for OmniAuth in a Ruby on Rails application allows you to better manage errors and maintain application health effectively. By using a ProxyLogger, you can delegate error-level logs to Rollbar, while having other log messages handled by Rails.logger. This method keeps your logging organization simple and effective, helping you get the most out of your error tracking.

By implementing this solution, you streamline your logging process, enhance error visibility, and ultimately improve the maintainability of your application.

Remember, effective logging is key to a successful application! Happy coding!