Should I Use a Single Global Logger or Separate Loggers for Goroutines in Go?

Choosing the Right Approach for Global Logging in Go

For applications logging in Go, selecting the most appropriate method can be crucial. Let's delve into the options you've outlined:

Single Global Logger vs. Pointer Passing

Creating a single log.Logger and passing it around or a pointer to it ensures that all goroutines can write to the same log object concurrently. While this approach allows for consistent logging, it is important to consider the potential for data corruption if multiple goroutines attempt to write to the writer simultaneously.

Logger Creation for Individual Tasks

Creating a logger for each goroutine or function is generally not recommended. Lightweight tasks handled by goroutines do not warrant the overhead of maintaining separate loggers. It is more efficient to use a single logger for a specific component of your application.

Global Logger as a Variable

Deciding whether to create the logger as a global variable depends on the specific application. For components that function independently, such as a mail service, having a separate logger per instance can provide flexibility in managing individual log output.

Recommended Approach

The most commonly recommended approach is to create a single log.Logger and pass it around by value. This ensures that each goroutine has its own copy of the Logger, eliminating the possibility of concurrent write conflicts. However, for larger components or packages, consider creating a separate logger for each instance, allowing for customized logging and error handling.

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