Prometheus: Export interpolateQueryExpr for metrics drilldown links (#109713)

export interpolateQueryExpr for metrics drilldown links

packages/grafana-prometheus/src/datasource.ts

@@ -47,7 +47,7 @@ import {
   InstantQueryRefIdIndex,
   SUGGESTIONS_LIMIT,
 } from './constants';
-import { prometheusRegularEscape, prometheusSpecialRegexEscape } from './escaping';
+import { interpolateQueryExpr, prometheusRegularEscape } from './escaping';
 import {
   exportToAbstractQuery,
   importFromAbstractQuery,
@@ -379,22 +379,7 @@ export class PrometheusDatasource
   }
 
   interpolateQueryExpr(value: string | string[] = [], variable: QueryVariableModel | CustomVariableModel) {
-    // if no multi or include all do not regexEscape
-    if (!variable.multi && !variable.includeAll) {
-      return prometheusRegularEscape(value);
-    }
-
-    if (typeof value === 'string') {
-      return prometheusSpecialRegexEscape(value);
-    }
-
-    const escapedValues = value.map((val) => prometheusSpecialRegexEscape(val));
-
-    if (escapedValues.length === 1) {
-      return escapedValues[0];
-    }
-
-    return '(' + escapedValues.join('|') + ')';
+    return interpolateQueryExpr(value, variable);
   }
 
   targetContainsTemplate(target: PromQuery) {

packages/grafana-prometheus/src/escaping.ts

@@ -1,8 +1,31 @@
 // NOTE: these two functions are similar to the escapeLabelValueIn* functions
 // in language_utils.ts, but they are not exactly the same algorithm, and we found
 
+import { QueryVariableModel, CustomVariableModel } from '@grafana/data';
 import { config } from '@grafana/runtime';
 
+export function interpolateQueryExpr(
+  value: string | string[] = [],
+  variable: QueryVariableModel | CustomVariableModel
+) {
+  // if no multi or include all do not regexEscape
+  if (!variable.multi && !variable.includeAll) {
+    return prometheusRegularEscape(value);
+  }
+
+  if (typeof value === 'string') {
+    return prometheusSpecialRegexEscape(value);
+  }
+
+  const escapedValues = value.map((val) => prometheusSpecialRegexEscape(val));
+
+  if (escapedValues.length === 1) {
+    return escapedValues[0];
+  }
+
+  return '(' + escapedValues.join('|') + ')';
+}
+
 // no way to reuse one in the another or vice versa.
 export function prometheusRegularEscape<T>(value: T) {
   if (typeof value !== 'string') {

packages/grafana-prometheus/src/index.ts

@@ -58,6 +58,7 @@ export { PrometheusDatasource } from './datasource';
 // The parts
 export { addLabelToQuery } from './add_label_to_query';
 export { type QueryEditorMode, type PromQueryFormat, type Prometheus } from './dataquery';
+export { interpolateQueryExpr } from './escaping';
 export { loadResources } from './loadResources';
 export { PrometheusMetricFindQuery } from './metric_find_query';
 export { promqlGrammar } from './promql';