Function trace_inject_traceparent

common/trace.c:144–174

If the `CLN_TRACEPARENT` envvar is set, we inject that as the * parent for the startup. This allows us to integrate the startup * tracing with whatever tooling we build around it. This only has an * effect if the envvar is set, otherwise the startup will create its * own parent. */

 * effect if the envvar is set, otherwise the startup will create its
 * own parent. */
static void trace_inject_traceparent(void)
{
	const char *traceparent;
	be64 trace_hi, trace_lo, span;

	traceparent = getenv("CLN_TRACEPARENT");
	if (!traceparent)
		return;

	assert(strlen(traceparent) == TRACEPARENT_LEN);
	current = trace_span_slot();
	assert(current);

	init_span(current, trace_key(&spans), "", NULL);
	assert(current && !current->parent);

	if (!hex_decode(traceparent + 3, 16, &trace_hi, sizeof(trace_hi)) ||
	    !hex_decode(traceparent + 3 + 16, 16, &trace_lo,
			sizeof(trace_lo)) ||
	    !hex_decode(traceparent + 3 + 16 + 16 + 1, 16, &span,
			sizeof(span))) {
		/* We failed to parse the traceparent, abandon. */
		fprintf(stderr, "Failed!");
		trace_span_clear(current);
		current = NULL;
	} else {
		current->trace_id_hi = be64_to_cpu(trace_hi);
		current->trace_id_lo = be64_to_cpu(trace_lo);
		current->id = be64_to_cpu(span);
	}
}

static void memleak_scan_spans(struct htable *memtable,
			       struct span_htable *spantable)