Loki: Allow multiple derived fields with the same name (#24437)

packages/grafana-ui/src/components/Logs/LogDetails.tsx

@@ -106,6 +106,10 @@ class UnThemedLogDetails extends PureComponent<Props> {
     );
   });
 
+  /**
+   * Returns all fields for log row which consists of fields we parse from the message itself and any derived fields
+   * setup in data source config.
+   */
   getAllFields = memoizeOne((row: LogRowModel) => {
     const fields = this.parseMessage(row.entry);
     const derivedFields = this.getDerivedFields(row);
@@ -121,18 +125,10 @@ class UnThemedLogDetails extends PureComponent<Props> {
       }
       return acc;
     }, {} as { [key: string]: FieldDef });
+
     const allFields = Object.values(fieldsMap);
-    allFields.sort((fieldA, fieldB) => {
-      if (fieldA.links?.length && !fieldB.links?.length) {
-        return -1;
-      }
+    allFields.sort(sortFieldsLinkFirst);
 
-      if (!fieldA.links?.length && fieldB.links?.length) {
-        return 1;
-      }
-
-      return fieldA.key > fieldB.key ? 1 : fieldA.key < fieldB.key ? -1 : 0;
-    });
     return allFields;
   });
 
@@ -233,5 +229,15 @@ class UnThemedLogDetails extends PureComponent<Props> {
   }
 }
 
+function sortFieldsLinkFirst(fieldA: FieldDef, fieldB: FieldDef) {
+  if (fieldA.links?.length && !fieldB.links?.length) {
+    return -1;
+  }
+  if (!fieldA.links?.length && fieldB.links?.length) {
+    return 1;
+  }
+  return fieldA.key > fieldB.key ? 1 : fieldA.key < fieldB.key ? -1 : 0;
+}
+
 export const LogDetails = withTheme(UnThemedLogDetails);
 LogDetails.displayName = 'LogDetails';

public/app/features/explore/utils/links.ts

@@ -5,7 +5,7 @@ import { serializeStateToUrlParam } from '../../../core/utils/explore';
 import { getDataSourceSrv } from '@grafana/runtime';
 
 /**
- * Get links from the filed of a dataframe that was given to as and in addition check if there is associated
+ * Get links from the field of a dataframe and in addition check if there is associated
  * metadata with datasource in which case we will add onClick to open the link in new split window. This assumes
  * that we just supply datasource name and field value and Explore split window will know how to render that
  * appropriately. This is for example used for transition from log with traceId to trace datasource to show that

public/app/plugins/datasource/loki/result_transformer.test.ts

@@ -131,6 +131,11 @@ describe('enhanceDataFrame', () => {
           name: 'trace2',
           datasourceUid: 'uid',
         },
+        {
+          matcherRegex: 'trace2=(\\w+)',
+          name: 'trace2',
+          datasourceUid: 'uid2',
+        },
       ],
     });
     expect(df.fields.length).toBe(3);
@@ -142,9 +147,14 @@ describe('enhanceDataFrame', () => {
     });
 
     expect(fc.getFieldByName('trace2').values.toArray()).toEqual([null, null, 'foo']);
+    expect(fc.getFieldByName('trace2').config.links.length).toBe(2);
     expect(fc.getFieldByName('trace2').config.links[0]).toEqual({
       title: '',
       meta: { datasourceUid: 'uid' },
     });
+    expect(fc.getFieldByName('trace2').config.links[1]).toEqual({
+      title: '',
+      meta: { datasourceUid: 'uid2' },
+    });
   });
 });

public/app/plugins/datasource/loki/result_transformer.ts

@@ -10,7 +10,6 @@ import {
   ArrayVector,
   MutableDataFrame,
   findUniqueLabels,
-  FieldConfig,
   DataFrameView,
   DataLink,
   Field,
@@ -332,14 +331,15 @@ export const enhanceDataFrame = (dataFrame: DataFrame, config: LokiOptions | nul
   if (!derivedFields.length) {
     return;
   }
-  const newFields = derivedFields.map(fieldFromDerivedFieldConfig);
-  const newFieldsMap = _.keyBy(newFields, 'name');
+  const derivedFieldsGrouped = _.groupBy(derivedFields, 'name');
+
+  const newFields = Object.values(derivedFieldsGrouped).map(fieldFromDerivedFieldConfig);
 
   const view = new DataFrameView(dataFrame);
   view.forEach((row: { line: string }) => {
-    for (const field of derivedFields) {
-      const logMatch = row.line.match(field.matcherRegex);
-      newFieldsMap[field.name].values.add(logMatch && logMatch[1]);
+    for (const field of newFields) {
+      const logMatch = row.line.match(derivedFieldsGrouped[field.name][0].matcherRegex);
+      field.values.add(logMatch && logMatch[1]);
     }
   });
 
@@ -349,28 +349,30 @@ export const enhanceDataFrame = (dataFrame: DataFrame, config: LokiOptions | nul
 /**
  * Transform derivedField config into dataframe field with config that contains link.
  */
-function fieldFromDerivedFieldConfig(derivedFieldConfig: DerivedFieldConfig): Field<any, ArrayVector> {
-  const config: FieldConfig = {};
+function fieldFromDerivedFieldConfig(derivedFieldConfigs: DerivedFieldConfig[]): Field<any, ArrayVector> {
+  const dataLinks = derivedFieldConfigs.reduce((acc, derivedFieldConfig) => {
     if (derivedFieldConfig.url || derivedFieldConfig.datasourceUid) {
-    const link: Partial<DataLink> = {
+      acc.push({
         // We do not know what title to give here so we count on presentation layer to create a title from metadata.
         title: '',
         url: derivedFieldConfig.url,
-    };
-
         // Having field.datasourceUid means it is an internal link.
-    if (derivedFieldConfig.datasourceUid) {
-      link.meta = {
+        meta: derivedFieldConfig.datasourceUid
+          ? {
               datasourceUid: derivedFieldConfig.datasourceUid,
-      };
             }
+          : undefined,
+      });
+    }
+    return acc;
+  }, [] as DataLink[]);
 
-    config.links = [link as DataLink];
-  }
   return {
-    name: derivedFieldConfig.name,
+    name: derivedFieldConfigs[0].name,
     type: FieldType.string,
-    config,
+    config: {
+      links: dataLinks,
+    },
     // We are adding values later on
     values: new ArrayVector<string>([]),
   };

scripts/ci-frontend-metrics.sh

@@ -4,7 +4,7 @@ echo -e "Collecting code stats (typescript errors & more)"
 
 
 
-ERROR_COUNT_LIMIT=728
+ERROR_COUNT_LIMIT=726
 DIRECTIVES_LIMIT=172
 CONTROLLERS_LIMIT=139