@grafana/alerting/dist/cjs/grafana/matchers/utils.cjs

Grafana Alerting Library – Build vertical integrations on top of the industry-leading alerting solution

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var data = require('@grafana/data');

"use strict";
function matchLabels(matchers, labels) {
  const matches = matchLabelsSet(matchers, labels);
  const details = labels.map((_label, index) => ({
    labelIndex: index,
    match: false,
    matcher: null
  }));
  matchers.forEach((matcher) => {
    const matchingLabelIndex = labels.findIndex((label) => isLabelMatch(matcher, label));
    if (matchingLabelIndex > -1) {
      details[matchingLabelIndex].match = true;
      details[matchingLabelIndex].matcher = matcher;
    }
  });
  return { matches, details };
}
function isLabelMatch(matcher, label) {
  const [labelKey, labelValue] = label;
  const { label: matcherLabel, type: matcherType, value: matcherValue } = matcher;
  if (labelKey !== matcherLabel) {
    return false;
  }
  const matchFunction = OperatorFunctions[matcherType];
  return matchFunction(labelValue, matcherValue);
}
function matchLabelsSet(matchers, labels) {
  for (const matcher of matchers) {
    if (!isLabelMatchInSet(matcher, labels)) {
      return false;
    }
  }
  return true;
}
function isLabelMatchInSet(matcher, labels) {
  const { label, type, value } = matcher;
  let labelValue = "";
  const labelForMatcher = Object.fromEntries(labels)[label];
  if (labelForMatcher) {
    labelValue = labelForMatcher;
  }
  const matchFunction = OperatorFunctions[type];
  try {
    return matchFunction(labelValue, value);
  } catch (err) {
    return false;
  }
}
const OperatorFunctions = {
  "=": (lv, mv) => lv === mv,
  "!=": (lv, mv) => lv !== mv,
  // At the time of writing, Alertmanager compiles to another (anchored) Regular Expression,
  // so we should also anchor our UI matches for consistency with this behaviour
  // https://github.com/prometheus/alertmanager/blob/fd37ce9c95898ca68be1ab4d4529517174b73c33/pkg/labels/matcher.go#L69
  "=~": (lv, mv) => {
    const valueWithFlagsParsed = data.parseFlags(`^(?:${mv})$`);
    const re = new RegExp(valueWithFlagsParsed.cleaned, valueWithFlagsParsed.flags);
    return re.test(lv);
  },
  "!~": (lv, mv) => {
    const valueWithFlagsParsed = data.parseFlags(`^(?:${mv})$`);
    const re = new RegExp(valueWithFlagsParsed.cleaned, valueWithFlagsParsed.flags);
    return !re.test(lv);
  }
};

exports.isLabelMatch = isLabelMatch;
exports.matchLabels = matchLabels;
exports.matchLabelsSet = matchLabelsSet;
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