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If there are more parts, we only reject it if it's using version 00\n // See https://www.w3.org/TR/trace-context/#versioning-of-traceparent\n if (match[1] === '00' && match[5]) return null;\n\n return {\n traceId: match[2],\n spanId: match[3],\n traceFlags: parseInt(match[4], 16),\n };\n}\n\n/**\n * Propagates {@link SpanContext} through Trace Context format propagation.\n *\n * Based on the Trace Context specification:\n * https://www.w3.org/TR/trace-context/\n */\nexport class W3CTraceContextPropagator implements TextMapPropagator {\n inject(context: Context, carrier: unknown, setter: TextMapSetter): void {\n const spanContext = trace.getSpanContext(context);\n if (\n !spanContext ||\n isTracingSuppressed(context) ||\n !isSpanContextValid(spanContext)\n )\n return;\n\n const traceParent = `${VERSION}-${spanContext.traceId}-${\n spanContext.spanId\n }-0${Number(spanContext.traceFlags || TraceFlags.NONE).toString(16)}`;\n\n setter.set(carrier, TRACE_PARENT_HEADER, traceParent);\n if (spanContext.traceState) {\n setter.set(\n carrier,\n TRACE_STATE_HEADER,\n spanContext.traceState.serialize()\n );\n }\n }\n\n extract(context: Context, carrier: unknown, getter: TextMapGetter): Context {\n const traceParentHeader = getter.get(carrier, TRACE_PARENT_HEADER);\n if (!traceParentHeader) return context;\n const traceParent = Array.isArray(traceParentHeader)\n ? traceParentHeader[0]\n : traceParentHeader;\n if (typeof traceParent !== 'string') return context;\n const spanContext = parseTraceParent(traceParent);\n if (!spanContext) return context;\n\n spanContext.isRemote = true;\n\n const traceStateHeader = getter.get(carrier, TRACE_STATE_HEADER);\n if (traceStateHeader) {\n // If more than one `tracestate` header is found, we merge them into a\n // single header.\n const state = Array.isArray(traceStateHeader)\n ? traceStateHeader.join(',')\n : traceStateHeader;\n spanContext.traceState = new TraceState(\n typeof state === 'string' ? state : undefined\n );\n }\n return trace.setSpanContext(context, spanContext);\n }\n\n fields(): string[] {\n return [TRACE_PARENT_HEADER, TRACE_STATE_HEADER];\n }\n}\n"]} |