func FromTraceParentHeader()

in golang/pkg/utils/utils.go [206:235]

• 30 lines of code
• 13 McCabe index (conditional complexity)

func FromTraceParentHeader(header string) (*trace.SpanContext, bool) {
	if len(header) != 55 || header[0] != '0' ||
		header[1] != '0' ||
		header[2] != '-' ||
		header[35] != '-' ||
		header[52] != '-' {
		return nil, false
	}
	trace_id_str := header[3 : 3+32]
	span_id_str := header[36 : 36+16]
	options_str := header[53 : 53+2]
	trace_id, err := hex.DecodeString(trace_id_str)
	if err != nil || len(trace_id) != 16 {
		return nil, false
	}
	span_id, err := hex.DecodeString(span_id_str)
	if err != nil || len(span_id) != 8 {
		return nil, false
	}
	options, err := hex.DecodeString(options_str)
	if err != nil || len(options) != 1 {
		return nil, false
	}
	sc := trace.SpanContext{
		TraceOptions: trace.TraceOptions(options[0]),
	}
	copy(sc.TraceID[:], trace_id[:])
	copy(sc.SpanID[:], span_id[:])
	return &sc, true
}