Add PPL query cancellation via Discover cancel button

src/plugins/query_enhancements/common/constants.ts

@@ -42,6 +42,7 @@ export const API = {
       INDEXES: `${BASE_API}/remote_cluster/indexes`,
     },
   },
+  PPL_CANCEL: `${BASE_API}/ppl/cancel`,
   PPL_GRAMMAR: `${BASE_API}/ppl/grammar`,
   AGENT_API: {
     CONFIG_EXISTS: `${BASE_API_ASSISTANT}/agent_config/_exists`,

src/plugins/query_enhancements/common/types.ts

@@ -30,6 +30,7 @@ export interface EnhancedFetchContext {
     pollQueryResultsParams?: PollQueryResultsParams;
     timeRange?: TimeRange;
     options?: Record<string, unknown>;
+    queryId?: string;
   };
 }
 

src/plugins/query_enhancements/common/utils.ts

@@ -78,6 +78,7 @@ export const fetch = (context: EnhancedFetchContext, query: Query, aggConfig?: Q
     pollQueryResultsParams: context.body?.pollQueryResultsParams,
     timeRange: context.body?.timeRange,
     ...(highlight && { highlight }),
+    ...(context.body?.queryId && { queryId: context.body.queryId }),
   });
 
   return from(
@@ -89,20 +90,38 @@ export const fetch = (context: EnhancedFetchContext, query: Query, aggConfig?: Q
         signal,
       })
       .catch(async (error) => {
-        if (error.name === 'AbortError' && context.body?.pollQueryResultsParams?.queryId) {
-          // Cancel job
-          try {
-            await http.fetch({
-              method: 'DELETE',
-              path: API.DATA_SOURCE.ASYNC_JOBS,
-              query: {
-                id: query.dataset?.dataSource?.id,
-                queryId: context.body?.pollQueryResultsParams.queryId,
-              },
-            });
-          } catch (cancelError) {
-            // eslint-disable-next-line no-console
-            console.error('Failed to cancel query:', cancelError);
+        if (error.name === 'AbortError') {
+          if (context.body?.pollQueryResultsParams?.queryId) {
+            // Cancel async job
+            try {
+              await http.fetch({
+                method: 'DELETE',
+                path: API.DATA_SOURCE.ASYNC_JOBS,
+                query: {
+                  id: query.dataset?.dataSource?.id,
+                  queryId: context.body?.pollQueryResultsParams.queryId,
+                },
+              });
+            } catch (cancelError) {
+              // eslint-disable-next-line no-console
+              console.error('Failed to cancel async query:', cancelError);
+            }
+          } else if (context.body?.queryId) {
+            // Fire-and-forget: notify backend to cancel the PPL task.
+            // No need to await — the UI should move on immediately.
+            http
+              .fetch({
+                method: 'POST',
+                path: API.PPL_CANCEL,
+                body: JSON.stringify({
+                  queryId: context.body.queryId,
+                  dataSourceId: query.dataset?.dataSource?.id,
+                }),
+              })
+              .catch((cancelError) => {
+                // eslint-disable-next-line no-console
+                console.error('Failed to cancel PPL query:', cancelError);
+              });
           }
         }
         throw error;

src/plugins/query_enhancements/public/search/ppl_search_interceptor.ts

@@ -4,6 +4,7 @@
  */
 
 import { trimEnd } from 'lodash';
+import { v4 as uuidv4 } from 'uuid';
 import { from, Observable } from 'rxjs';
 import { first, switchMap } from 'rxjs/operators';
 import { formatTimePickerDate, Query, UI_SETTINGS } from '../../../data/common';
@@ -54,13 +55,15 @@ export class PPLSearchInterceptor extends SearchInterceptor {
     strategy?: string
   ): Observable<IOpenSearchDashboardsSearchResponse> {
     const { id, ...searchRequest } = request;
+    const isAsync = strategy === SEARCH_STRATEGY.PPL_ASYNC;
     const context: EnhancedFetchContext = {
       http: this.deps.http,
       path: trimEnd(`${API.SEARCH}/${strategy}`),
       signal,
       body: {
         pollQueryResultsParams: request.params?.pollQueryResultsParams,
         timeRange: request.params?.body?.timeRange,
+        ...(!isAsync && { queryId: uuidv4() }),
       },
     };
 

src/plugins/query_enhancements/server/routes/index.ts

@@ -16,6 +16,7 @@ import { API, URI } from '../../common';
 import { registerQueryAssistRoutes } from './query_assist';
 import { registerDataSourceConnectionsRoutes } from './data_source_connection';
 import { registerResourceRoutes } from './resources';
+import { registerPPLCancelRoute } from './ppl_cancel';
 
 /**
  * Coerce status code to 503 for 500 errors from dependency services. Only use
@@ -90,6 +91,7 @@ export function defineSearchStrategyRouteProvider(logger: Logger, router: IRoute
             timeRange: schema.maybe(schema.object({}, { unknowns: 'allow' })),
             options: schema.maybe(schema.object({}, { unknowns: 'allow' })),
             highlight: schema.maybe(schema.object({}, { unknowns: 'allow' })),
+            queryId: schema.maybe(schema.string()),
           }),
         },
       },
@@ -187,6 +189,7 @@ export function defineRoutes(
   registerDataSourceConnectionsRoutes(router, client);
   registerQueryAssistRoutes(router);
   registerResourceRoutes(router);
+  registerPPLCancelRoute(router, logger);
 
   definePPLBundleRoute(logger, router);
 }

src/plugins/query_enhancements/server/routes/ppl_cancel.test.ts

@@ -0,0 +1,267 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { loggingSystemMock } from '../../../../core/server/mocks';
+import { registerPPLCancelRoute } from './ppl_cancel';
+
+describe('registerPPLCancelRoute', () => {
+  let handler: any;
+  let logger: ReturnType<typeof loggingSystemMock.create>['get'];
+
+  const createResponse = () => ({
+    ok: jest.fn((v) => v),
+    notFound: jest.fn((v) => v),
+    custom: jest.fn((v) => v),
+  });
+
+  const createContext = (transportRequestMock: jest.Mock) =>
+    ({
+      core: {
+        opensearch: {
+          client: {
+            asCurrentUser: {
+              transport: {
+                request: transportRequestMock,
+              },
+            },
+          },
+        },
+      },
+      dataSource: {
+        opensearch: {
+          getClient: jest.fn().mockResolvedValue({
+            transport: {
+              request: transportRequestMock,
+            },
+          }),
+        },
+      },
+    } as any);
+
+  const tasksResponseWithMatch = (queryId: string) => ({
+    body: {
+      nodes: {
+        node1: {
+          tasks: {
+            'node1:12345': {
+              description: `PPL [queryId=${queryId}]: source=test`,
+              action: 'indices:data/read/ppl',
+            },
+          },
+        },
+      },
+    },
+  });
+
+  const tasksResponseNoMatch = {
+    body: {
+      nodes: {
+        node1: {
+          tasks: {
+            'node1:99999': {
+              description: 'PPL [queryId=other-id]: source=test',
+              action: 'indices:data/read/ppl',
+            },
+          },
+        },
+      },
+    },
+  };
+
+  const tasksResponseEmpty = {
+    body: {
+      nodes: {},
+    },
+  };
+
+  beforeEach(() => {
+    const router = {
+      post: jest.fn((_, h) => {
+        handler = h;
+      }),
+    } as any;
+    logger = loggingSystemMock.create().get();
+    registerPPLCancelRoute(router, logger);
+  });
+
+  it('should cancel a matching PPL task successfully', async () => {
+    const queryId = 'test-uuid-1234';
+    const transportRequest = jest
+      .fn()
+      .mockResolvedValueOnce(tasksResponseWithMatch(queryId))
+      .mockResolvedValueOnce({ body: { nodes: {} } });
+
+    const context = createContext(transportRequest);
+    const req = { body: { queryId } } as any;
+    const res = createResponse();
+
+    await handler(context, req, res);
+
+    expect(transportRequest).toHaveBeenCalledWith({
+      method: 'GET',
+      path: '/_tasks',
+      querystring: { actions: '*ppl*', detailed: 'true' },
+    });
+    expect(transportRequest).toHaveBeenCalledWith({
+      method: 'POST',
+      path: '/_tasks/node1:12345/_cancel',
+    });
+    expect(res.ok).toHaveBeenCalledWith({
+      body: {
+        cancelled: true,
+        queryId,
+        tasks: [
+          expect.objectContaining({
+            taskId: 'node1:12345',
+            nodeId: 'node1',
+          }),
+        ],
+      },
+    });
+  });
+
+  it('should return 404 when no matching task is found', async () => {
+    const queryId = 'nonexistent-uuid';
+    const transportRequest = jest.fn().mockResolvedValueOnce(tasksResponseNoMatch);
+
+    const context = createContext(transportRequest);
+    const req = { body: { queryId } } as any;
+    const res = createResponse();
+
+    await handler(context, req, res);
+
+    expect(transportRequest).toHaveBeenCalledTimes(1);
+    expect(res.notFound).toHaveBeenCalledWith({
+      body: { message: `No running PPL task found for queryId: ${queryId}` },
+    });
+  });
+
+  it('should return 404 when no tasks exist', async () => {
+    const queryId = 'some-uuid';
+    const transportRequest = jest.fn().mockResolvedValueOnce(tasksResponseEmpty);
+
+    const context = createContext(transportRequest);
+    const req = { body: { queryId } } as any;
+    const res = createResponse();
+
+    await handler(context, req, res);
+
+    expect(res.notFound).toHaveBeenCalled();
+  });
+
+  it('should use data source client when dataSourceId is provided', async () => {
+    const queryId = 'ds-uuid';
+    const dataSourceId = 'ds-1';
+    const transportRequest = jest
+      .fn()
+      .mockResolvedValueOnce(tasksResponseWithMatch(queryId))
+      .mockResolvedValueOnce({ body: {} });
+
+    const context = createContext(transportRequest);
+    const req = { body: { queryId, dataSourceId } } as any;
+    const res = createResponse();
+
+    await handler(context, req, res);
+
+    expect(context.dataSource.opensearch.getClient).toHaveBeenCalledWith(dataSourceId);
+    expect(res.ok).toHaveBeenCalled();
+  });
+
+  it('should use core client when dataSourceId is not provided', async () => {
+    const queryId = 'local-uuid';
+    const transportRequest = jest
+      .fn()
+      .mockResolvedValueOnce(tasksResponseWithMatch(queryId))
+      .mockResolvedValueOnce({ body: {} });
+
+    const context = createContext(transportRequest);
+    const req = { body: { queryId } } as any;
+    const res = createResponse();
+
+    await handler(context, req, res);
+
+    expect(context.dataSource.opensearch.getClient).not.toHaveBeenCalled();
+    expect(res.ok).toHaveBeenCalled();
+  });
+
+  it('should handle OpenSearch errors and coerce 500 to 503', async () => {
+    const queryId = 'error-uuid';
+    const transportRequest = jest.fn().mockRejectedValueOnce({
+      statusCode: 500,
+      message: 'internal server error',
+    });
+
+    const context = createContext(transportRequest);
+    const req = { body: { queryId } } as any;
+    const res = createResponse();
+
+    await handler(context, req, res);
+
+    expect(res.custom).toHaveBeenCalledWith({
+      statusCode: 503,
+      body: 'internal server error',
+    });
+  });
+
+  it('should cancel all matching tasks across multiple nodes', async () => {
+    const queryId = 'multi-task-uuid';
+    const transportRequest = jest
+      .fn()
+      .mockResolvedValueOnce({
+        body: {
+          nodes: {
+            node1: {
+              tasks: {
+                'node1:111': {
+                  description: `PPL [queryId=${queryId}]: source=test`,
+                },
+              },
+            },
+            node2: {
+              tasks: {
+                'node2:222': {
+                  description: `PPL [queryId=${queryId}]: source=test | stats count()`,
+                },
+                'node2:333': {
+                  description: 'PPL [queryId=other]: source=other',
+                },
+              },
+            },
+          },
+        },
+      })
+      .mockResolvedValue({ body: {} });
+
+    const context = createContext(transportRequest);
+    const req = { body: { queryId } } as any;
+    const res = createResponse();
+
+    await handler(context, req, res);
+
+    // Should cancel both matching tasks, not the non-matching one
+    expect(transportRequest).toHaveBeenCalledWith({
+      method: 'POST',
+      path: '/_tasks/node1:111/_cancel',
+    });
+    expect(transportRequest).toHaveBeenCalledWith({
+      method: 'POST',
+      path: '/_tasks/node2:222/_cancel',
+    });
+    expect(transportRequest).not.toHaveBeenCalledWith({
+      method: 'POST',
+      path: '/_tasks/node2:333/_cancel',
+    });
+    expect(res.ok).toHaveBeenCalledWith({
+      body: {
+        cancelled: true,
+        queryId,
+        tasks: expect.arrayContaining([
+          expect.objectContaining({ taskId: 'node1:111', nodeId: 'node1' }),
+          expect.objectContaining({ taskId: 'node2:222', nodeId: 'node2' }),
+        ]),
+      },
+    });
+  });
+});