Loki: Fix error handling, remove legacy condition (#38633)

* Fix error handling, remove legacy condition

* Fix strict errors in Loki and lower error count

* Update

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

@@ -42,9 +42,9 @@ import {
   LokiOptions,
   LokiQuery,
   LokiRangeQueryRequest,
-  LokiResponse,
   LokiResultType,
   LokiStreamResponse,
+  LokiStreamResult,
 } from './types';
 import { LiveStreams, LokiLiveTarget } from './live_streams';
 import LanguageProvider from './language_provider';
@@ -156,7 +156,7 @@ export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
     };
 
     return this._request(INSTANT_QUERY_ENDPOINT, query).pipe(
-      map((response: { data: LokiResponse }) => {
+      map((response) => {
         if (response.data.data.resultType === LokiResultType.Stream) {
           return {
             data: response.data
@@ -176,7 +176,7 @@ export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
           key: `${target.refId}_instant`,
         };
       }),
-      catchError((err: any) => this.throwUnless(err, err.status === 404, target))
+      catchError((err) => throwError(() => this.processError(err, target)))
     );
   };
 
@@ -236,8 +236,8 @@ export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
     const query = this.createRangeQuery(target, options, maxDataPoints);
 
     return this._request(RANGE_QUERY_ENDPOINT, query).pipe(
-      catchError((err: any) => this.throwUnless(err, err.status === 404, target)),
+      catchError((err) => throwError(() => this.processError(err, target))),
-      switchMap((response: { data: LokiResponse; status: number }) =>
+      switchMap((response) =>
         processRangeQueryResponse(
           response.data,
           target,
@@ -281,7 +281,7 @@ export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
         state: LoadingState.Streaming,
       })),
       catchError((err: any) => {
-        return throwError(`Live tailing was stopped due to following error: ${err.reason}`);
+        return throwError(() => `Live tailing was stopped due to following error: ${err.reason}`);
       })
     );
   };
@@ -451,11 +451,7 @@ export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
     const reverse = options && options.direction === 'FORWARD';
     return lastValueFrom(
       this._request(RANGE_QUERY_ENDPOINT, target).pipe(
-        catchError((err: any) => {
+        catchError((err) => {
-          if (err.status === 404) {
-            return of(err);
-          }
-
           const error: DataQueryError = {
             message: 'Error during context query. Please check JS console logs.',
             status: err.status,
@@ -463,9 +459,11 @@ export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
           };
           throw error;
         }),
-        switchMap((res: { data: LokiStreamResponse; status: number }) =>
+        switchMap((res) =>
           of({
-            data: res.data ? res.data.data.result.map((stream) => lokiStreamResultToDataFrame(stream, reverse)) : [],
+            data: res.data
+              ? res.data.data.result.map((stream: LokiStreamResult) => lokiStreamResultToDataFrame(stream, reverse))
+              : [],
           })
         )
       )
@@ -625,15 +623,6 @@ export class LokiDatasource extends DataSourceApi<LokiQuery, LokiOptions> {
     return (row && row.searchWords && row.searchWords.length > 0) === true;
   }
 
-  throwUnless(err: FetchError, condition: boolean, target: LokiQuery) {
-    if (condition) {
-      return of(err);
-    }
-
-    const error = this.processError(err, target);
-    throw error;
-  }
-
   processError(err: FetchError, target: LokiQuery) {
     let error = cloneDeep(err);
     if (err.data.message.includes('escape') && target.expr.includes('\\')) {

scripts/ci-check-strict.sh

@@ -3,7 +3,7 @@ set -e
 
 echo -e "Collecting code stats (typescript errors & more)"
 
-ERROR_COUNT_LIMIT=49
+ERROR_COUNT_LIMIT=47
 ERROR_COUNT="$(./node_modules/.bin/tsc --project tsconfig.json --noEmit --strict true | grep -oP 'Found \K(\d+)')"
 
 if [ "$ERROR_COUNT" -gt $ERROR_COUNT_LIMIT ]; then