Go で文字列 TraceID から OpenTelemetry Span を作成するにはどうすればよいですか?

<code class="go">func constructNewSpanContext(request NewRequest) (spanContext trace.SpanContext, err error) {
    // Assuming the trace and span IDs are provided as strings in request struct.

    var traceID trace.TraceID
    traceID, err = trace.TraceIDFromHex(request.TraceID)
    if err != nil {
        fmt.Println("error:", err)
        return
    }

    var spanID trace.SpanID
    spanID, err = trace.SpanIDFromHex(request.SpanID)
    if err != nil {
        fmt.Println("error:", err)
        return
    }

    spanContextConfig := trace.SpanContextConfig{
        TraceID: traceID,
        SpanID:  spanID,
        // Other TraceFlag bits if desired
    }

    spanContext = trace.NewSpanContext(spanContextConfig)
    return spanContext, nil
}</code>

<code class="go">spanContext, err := constructNewSpanContext(request)
if err != nil {
    fmt.Println("ERROR:", err)
}

fmt.Println("IS VALID?", spanContext.IsValid()) // Check if the `spanContext` is valid

requestContext := context.Background()
requestContext = trace.ContextWithSpanContext(requestContext, spanContext)

// Start a new span within the enriched context
var requestInLoopSpan trace.Span
childContext, requestInLoopSpan := otel.Tracer("inboundmessage").Start(requestContext, "requestInLoopSpan")

requestInLoopSpan.AddEvent("processing....") // Should now work</code>