How to use the dd-trace.extract function in dd-trace
To help you get started, we’ve selected a few dd-trace examples, based on popular ways it is used in public projects.
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DataDog / datadog-lambda-layer-js / src / trace / listener.ts View on Github 
public onWrap any>(func: T): T {
const rootTraceContext = this.contextService.currentTraceHeaders;
const spanContext: SpanContext | null = Tracer.extract("http_headers", rootTraceContext);
const options: SpanOptions & TraceOptions = {};
if (this.context) {
options.tags = {
cold_start: this.coldstart,
event_source: this.eventSource,
function_arn: this.context.invokedFunctionArn,
request_id: this.context.awsRequestId,
resource_names: this.context.functionName,
};
}
if (spanContext !== null) {
options.childOf = spanContext;
}
return Tracer.wrap(this.handlerName, options, func);dd-trace
Datadog APM tracing client for JavaScript
