grafana/public/app/plugins/datasource/graphite/configuration/parseLokiLabelMappings.ts

import { GraphiteLokiMapping } from '../types';

/**
 * Converts a simple string used in LokiLogsMappings component (e.g. "servers.(name).*")
 * to data model saved in data source configuration.
 */
export function fromString(text: string): GraphiteLokiMapping {
  return {
    matchers: text.split('.').map((metricNode) => {
      if (metricNode.startsWith('(') && metricNode.endsWith(')')) {
        return {
          value: '*',
          labelName: metricNode.slice(1, -1),
        };
      } else {
        return { value: metricNode };
      }
    }),
  };
}

/**
 * Coverts configuration stored in data source configuration into a string displayed in LokiLogsMappings component.
 */
export function toString(mapping: GraphiteLokiMapping): string {
  return mapping.matchers
    .map((matcher) => {
      return matcher.labelName ? `(${matcher.labelName})` : `${matcher.value}`;
    })
    .join('.');
}