How to Achieve MDC-Like Logging in GoLang?

Achieving MDC Logging in GoLang

Logging with Mapped Diagnostic Context (MDC) in Java allows for tracing concurrent requests by adding UUIDs to server logs. In Go, thread local storage, which MDC relies on in Java, is unavailable.

GoLang's Solution: Threading Context

To enable MDC-like logging in Go, it's necessary to thread a Context throughout the application stack. This approach has gained popularity among Go libraries.

A common implementation includes using a middleware package to add a request ID to the context of a web request. This allows you to retrieve the ID using ctx.Value("requestId") and use it for logging.

For instance, you can create a custom logger function:

<code class="go">func logStuff(ctx context.Context, msg string) {
    log.Println(ctx.Value("requestId"), msg) // Call the standard library logger
}</code>

This approach offers flexibility and allows you to handle request IDs as necessary. While it's not a direct equivalent of Java's MDC, it provides a viable solution for tracing concurrent requests in Go.

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