How to Achieve MDC-like Logging in Golang Without Thread Local Storage?

Taming Threadless Logging: Achieving MDC in Golang

Achieving a logging mechanism similar to MDC (Mapped Diagnostic Context) in Java is not straightforward in Golang. The absence of thread local storage in Go poses a significant obstacle.

To circumnavigate this limitation, the recommended approach is to pass a Context through the request stack. This is becoming increasingly common in Golang libraries.

A typical implementation involves using a middleware to add a unique request ID to the context. Here's an example:

req = req.WithContext(context.WithValue(req.Context(), "requestId", ID))

This request ID can then be retrieved and utilized throughout the code by accessing ctx.Value("requestId").

To customize the logging process, a dedicated logger function can be created:

func logStuff(ctx context.Context, msg string) {
    log.Println(ctx.Value("requestId"), msg) // log using the stdlib logger
}

By integrating various methods, Golang developers can implement a logging mechanism that provides similar functionality to MDC in Java, allowing for efficient tracing of concurrent requests through customized logs.

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