What's the Best Way to Implement Global Logging in Go?

Correct Approach to Global Logging in Go

When implementing logging in Go, several options arise: passing around a single log.Logger, a pointer to it, or creating a logger for each goroutine or function. Additionally, the logger can be declared as a global variable.

Passing a Single log.Logger vs. a Pointer

Passing a pointer to log.Logger is recommended, as log.New returns a pointer. Value passing would create a copy, potentially leading to concurrent write issues.

Creating Loggers for Goroutines or Functions

It's generally not advisable to create a separate logger for each goroutine or function. These tasks are lightweight and don't warrant dedicated loggers. Instead, consider creating loggers for larger components of the project.

Global Variables and Loggers

Declaring a logger as a global variable can be appropriate. For instance, in a mail service package, it makes sense to have one logger for each instance of the service, allowing users to differentiate between failures in different mail services (e.g., Gmail vs. local MTA).

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