rollbar/src/tracing/tracer.js

Effortlessly track and debug errors in your JavaScript applications with Rollbar. This package includes advanced error tracking features and an intuitive interface to help you identify and fix issues more quickly.

import id from './id.js';
import { Span } from './span.js';

export class Tracer {
  constructor(tracing, spanProcessor) {
    this.spanProcessor = spanProcessor;
    this.tracing = tracing;
  }

  startSpan(
    name,
    options = {},
    context = this.tracing.contextManager.active(),
  ) {
    const parentSpan = this.tracing.getSpan(context);
    const parentSpanContext = parentSpan?.spanContext();
    const spanId = id.gen(8);
    let traceId;
    let traceFlags = 0;
    let traceState = null;
    let parentSpanId;
    if (parentSpanContext) {
      traceId = parentSpanContext.traceId;
      traceState = parentSpanContext.traceState;
      parentSpanId = parentSpanContext.spanId;
    } else {
      traceId = id.gen(16);
    }

    const kind = 0;
    const spanContext = { traceId, spanId, traceFlags, traceState };
    const resource = {
      attributes: {
        ...(this.tracing.resource?.attributes || {}),
        ...(options.resource?.attributes || {}),
      },
    };

    const span = new Span({
      resource: resource,
      scope: this.tracing.scope,
      session: this.tracing.session?.session,
      context,
      spanContext,
      name,
      kind,
      parentSpanId,
      spanProcessor: this.spanProcessor,
      startTime: options.startTime,
      usePerformance: options.usePerformance,
    });
    return span;
  }
}