Constructing an OpenTelemetry Span from a String TraceID
To establish the parent-child relationship between spans, the headers must be utilized in situations where context propagation is not viable. In this scenario, a trace ID and span ID are contained within the message broker's headers, which allows the subscriber to create a new span with the parent trace ID.
Solution
The following steps can be taken to construct a context or span on the subscriber side using the trace ID:
- Define a function with the trace ID as an argument:
<code class="go">func constructNewSpanContext(traceID string) (spanContext trace.SpanContext, err error) { traceID, err := trace.TraceIDFromHex(traceID) if err != nil { return trace.SpanContext{}, err } return trace.NewSpanContext(trace.SpanContextConfig{ TraceID: traceID, }), nil }</code>
- Inside the channel, call the function to construct the span context:
<code class="go">spanContext, err := constructNewSpanContext(request.TraceID) if err != nil { log.Fatal(err) }</code>
- Enrich a context with the constructed span context:
<code class="go">requestContext := context.Background() requestContext = trace.ContextWithSpanContext(requestContext, spanContext)</code>
- Create a new span using the enriched context:
<code class="go">requestInLoopSpan, _ := otel.Tracer("requestInLoop").Start(requestContext, "requestInLoopSpan")</code>
By following these steps, you can successfully construct a new span on the subscriber side using the trace ID extracted from the message headers, ensuring the hierarchical relationship between the spans.
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