Function objectToBaggageHeader

packages/core/src/utils/baggage.ts:149–168

(object: Record<string, string>)

 * is not spec compliant.
 */
export function objectToBaggageHeader(object: Record<string, string>): string | undefined {
  if (Object.keys(object).length === 0) {
    // An empty baggage header is not spec compliant: We return undefined.
    return undefined;
  }

  return Object.entries(object).reduce((baggageHeader, [objectKey, objectValue], currentIndex) => {
    const baggageEntry = `${encodeURIComponent(objectKey)}=${encodeURIComponent(objectValue)}`;
    const newBaggageHeader = currentIndex === 0 ? baggageEntry : `${baggageHeader},${baggageEntry}`;
    if (newBaggageHeader.length > MAX_BAGGAGE_STRING_LENGTH) {
      DEBUG_BUILD &&
        debug.warn(
          `Not adding key: ${objectKey} with val: ${objectValue} to baggage header due to exceeding baggage size limits.`,
        );
      return baggageHeader;
    } else {
      return newBaggageHeader;
    }
  }, '');
}

/**
 * Merge two baggage headers into one.