[Search] Search batching using bfetch

docs/development/plugins/data/public/kibana-plugin-plugins-data-public.plugin.setup.md

@@ -7,15 +7,15 @@
 <b>Signature:</b>
 
 ```typescript
-setup(core: CoreSetup<DataStartDependencies, DataPublicPluginStart>, { expressions, uiActions, usageCollection }: DataSetupDependencies): DataPublicPluginSetup;
+setup(core: CoreSetup<DataStartDependencies, DataPublicPluginStart>, { bfetch, expressions, uiActions, usageCollection }: DataSetupDependencies): DataPublicPluginSetup;
 ```
 
 ## Parameters
 
 |  Parameter | Type | Description |
 |  --- | --- | --- |
 |  core | <code>CoreSetup&lt;DataStartDependencies, DataPublicPluginStart&gt;</code> |  |
-|  { expressions, uiActions, usageCollection } | <code>DataSetupDependencies</code> |  |
+|  { bfetch, expressions, uiActions, usageCollection } | <code>DataSetupDependencies</code> |  |
 
 <b>Returns:</b>
 

docs/development/plugins/data/public/kibana-plugin-plugins-data-public.searchinterceptordeps.bfetch.md

@@ -0,0 +1,11 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-data-public](./kibana-plugin-plugins-data-public.md) &gt; [SearchInterceptorDeps](./kibana-plugin-plugins-data-public.searchinterceptordeps.md) &gt; [bfetch](./kibana-plugin-plugins-data-public.searchinterceptordeps.bfetch.md)
+
+## SearchInterceptorDeps.bfetch property
+
+<b>Signature:</b>
+
+```typescript
+bfetch: BfetchPublicSetup;
+```

docs/development/plugins/data/public/kibana-plugin-plugins-data-public.searchinterceptordeps.md

@@ -14,6 +14,7 @@ export interface SearchInterceptorDeps
 
 |  Property | Type | Description |
 |  --- | --- | --- |
+|  [bfetch](./kibana-plugin-plugins-data-public.searchinterceptordeps.bfetch.md) | <code>BfetchPublicSetup</code> |  |
 |  [http](./kibana-plugin-plugins-data-public.searchinterceptordeps.http.md) | <code>CoreSetup['http']</code> |  |
 |  [session](./kibana-plugin-plugins-data-public.searchinterceptordeps.session.md) | <code>ISessionService</code> |  |
 |  [startServices](./kibana-plugin-plugins-data-public.searchinterceptordeps.startservices.md) | <code>Promise&lt;[CoreStart, any, unknown]&gt;</code> |  |

docs/development/plugins/data/server/kibana-plugin-plugins-data-server.plugin.setup.md

@@ -7,7 +7,7 @@
 <b>Signature:</b>
 
 ```typescript
-setup(core: CoreSetup<DataPluginStartDependencies, DataPluginStart>, { expressions, usageCollection }: DataPluginSetupDependencies): {
+setup(core: CoreSetup<DataPluginStartDependencies, DataPluginStart>, { bfetch, expressions, usageCollection }: DataPluginSetupDependencies): {
         __enhance: (enhancements: DataEnhancements) => void;
         search: ISearchSetup;
         fieldFormats: {
@@ -21,7 +21,7 @@ setup(core: CoreSetup<DataPluginStartDependencies, DataPluginStart>, { expressio
 |  Parameter | Type | Description |
 |  --- | --- | --- |
 |  core | <code>CoreSetup&lt;DataPluginStartDependencies, DataPluginStart&gt;</code> |  |
-|  { expressions, usageCollection } | <code>DataPluginSetupDependencies</code> |  |
+|  { bfetch, expressions, usageCollection } | <code>DataPluginSetupDependencies</code> |  |
 
 <b>Returns:</b>
 

src/plugins/bfetch/public/batching/create_streaming_batched_function.test.ts

@@ -19,7 +19,7 @@
 
 import { createStreamingBatchedFunction } from './create_streaming_batched_function';
 import { fetchStreaming as fetchStreamingReal } from '../streaming/fetch_streaming';
-import { defer, of } from '../../../kibana_utils/public';
+import { AbortError, defer, of } from '../../../kibana_utils/public';
 import { Subject } from 'rxjs';
 
 const getPromiseState = (promise: Promise<unknown>): Promise<'resolved' | 'rejected' | 'pending'> =>
@@ -168,6 +168,28 @@ describe('createStreamingBatchedFunction()', () => {
       expect(fetchStreaming).toHaveBeenCalledTimes(1);
     });
 
+    test('ignores a request with an aborted signal', async () => {
+      const { fetchStreaming } = setup();
+      const fn = createStreamingBatchedFunction({
+        url: '/test',
+        fetchStreaming,
+        maxItemAge: 5,
+        flushOnMaxItems: 3,
+      });
+
+      const abortController = new AbortController();
+      abortController.abort();
+
+      of(fn({ foo: 'bar' }, abortController.signal));
+      fn({ baz: 'quix' });
+
+      await new Promise((r) => setTimeout(r, 6));
+      const { body } = fetchStreaming.mock.calls[0][0];
+      expect(JSON.parse(body)).toEqual({
+        batch: [{ baz: 'quix' }],
+      });
+    });
+
     test('sends POST request to correct endpoint with items in array batched sorted in call order', async () => {
       const { fetchStreaming } = setup();
       const fn = createStreamingBatchedFunction({
@@ -423,6 +445,73 @@ describe('createStreamingBatchedFunction()', () => {
       expect(result3).toEqual({ b: '3' });
     });
 
+    describe('when requests are aborted', () => {
+      test('aborts stream when all are aborted', async () => {
+        const { fetchStreaming } = setup();
+        const fn = createStreamingBatchedFunction({
+          url: '/test',
+          fetchStreaming,
+          maxItemAge: 5,
+          flushOnMaxItems: 3,
+        });
+
+        const abortController = new AbortController();
+        const promise = fn({ a: '1' }, abortController.signal);
+        const promise2 = fn({ a: '2' }, abortController.signal);
+        await new Promise((r) => setTimeout(r, 6));
+
+        expect(await isPending(promise)).toBe(true);
+        expect(await isPending(promise2)).toBe(true);
+
+        abortController.abort();
+        await new Promise((r) => setTimeout(r, 6));
+
+        expect(await isPending(promise)).toBe(false);
+        expect(await isPending(promise2)).toBe(false);
+        const [, error] = await of(promise);
+        const [, error2] = await of(promise2);
+        expect(error).toBeInstanceOf(AbortError);
+        expect(error2).toBeInstanceOf(AbortError);
+        expect(fetchStreaming.mock.calls[0][0].signal.aborted).toBeTruthy();
+      });
+
+      test('rejects promise on abort and lets others continue', async () => {
+        const { fetchStreaming, stream } = setup();
+        const fn = createStreamingBatchedFunction({
+          url: '/test',
+          fetchStreaming,
+          maxItemAge: 5,
+          flushOnMaxItems: 3,
+        });
+
+        const abortController = new AbortController();
+        const promise = fn({ a: '1' }, abortController.signal);
+        const promise2 = fn({ a: '2' });
+        await new Promise((r) => setTimeout(r, 6));
+
+        expect(await isPending(promise)).toBe(true);
+
+        abortController.abort();
+        await new Promise((r) => setTimeout(r, 6));
+
+        expect(await isPending(promise)).toBe(false);
+        const [, error] = await of(promise);
+        expect(error).toBeInstanceOf(AbortError);
+
+        stream.next(
+          JSON.stringify({
+            id: 1,
+            result: { b: '2' },
+          }) + '\n'
+        );
+
+        await new Promise((r) => setTimeout(r, 1));
+
+        const [result2] = await of(promise2);
+        expect(result2).toEqual({ b: '2' });
+      });
+    });
+
     describe('when stream closes prematurely', () => {
       test('rejects pending promises with CONNECTION error code', async () => {
         const { fetchStreaming, stream } = setup();

src/plugins/bfetch/public/batching/create_streaming_batched_function.ts

@@ -17,7 +17,7 @@
  * under the License.
  */
 
-import { defer, Defer } from '../../../kibana_utils/public';
+import { AbortError, abortSignalToPromise, defer } from '../../../kibana_utils/public';
 import {
   ItemBufferParams,
   TimedItemBufferParams,
@@ -27,13 +27,7 @@ import {
 } from '../../common';
 import { fetchStreaming, split } from '../streaming';
 import { normalizeError } from '../../common';
-
-export interface BatchItem<Payload, Result> {
-  payload: Payload;
-  future: Defer<Result>;
-}
-
-export type BatchedFunc<Payload, Result> = (payload: Payload) => Promise<Result>;
+import { BatchedFunc, BatchItem } from './types';
 
 export interface BatchedFunctionProtocolError extends ErrorLike {
   code: string;
@@ -82,32 +76,67 @@ export const createStreamingBatchedFunction = <Payload, Result extends object>(
     flushOnMaxItems = 25,
     maxItemAge = 10,
   } = params;
-  const [fn] = createBatchedFunction<BatchedFunc<Payload, Result>, BatchItem<Payload, Result>>({
-    onCall: (payload: Payload) => {
+  const [fn] = createBatchedFunction({
+    onCall: (payload: Payload, signal?: AbortSignal) => {
       const future = defer<Result>();
       const entry: BatchItem<Payload, Result> = {
         payload,
         future,
+        signal,
       };
       return [future.promise, entry];
     },
     onBatch: async (items) => {
       try {
-        let responsesReceived = 0;
-        const batch = items.map(({ payload }) => payload);
+        // Filter out any items whose signal is already aborted
+        items = items.filter((item) => {
+          if (item.signal?.aborted) item.future.reject(new AbortError());
+          return !item.signal?.aborted;
+        });
+
+        const donePromises: Array<Promise<any>> = items.map((item) => {
+          return new Promise<void>((resolve) => {
+            const { promise: abortPromise, cleanup } = item.signal
+              ? abortSignalToPromise(item.signal)
+              : {
+                  promise: undefined,
+                  cleanup: () => {},
+                };
+
+            const onDone = () => {
+              resolve();
+              cleanup();
+            };
+            if (abortPromise)
+              abortPromise.catch(() => {
+                item.future.reject(new AbortError());
+                onDone();
+              });
+            item.future.promise.then(onDone, onDone);
+          });
+        });
+
+        // abort when all items were either resolved, rejected or aborted
+        const abortController = new AbortController();
+        let isBatchDone = false;
+        Promise.all(donePromises).then(() => {
+          isBatchDone = true;
+          abortController.abort();
+        });
+        const batch = items.map((item) => item.payload);
+
         const { stream } = fetchStreamingInjected({
           url,
           body: JSON.stringify({ batch }),
           method: 'POST',
+          signal: abortController.signal,
         });
         stream.pipe(split('\n')).subscribe({
           next: (json: string) => {
             const response = JSON.parse(json) as BatchResponseItem<Result, ErrorLike>;
             if (response.error) {
-              responsesReceived++;
               items[response.id].future.reject(response.error);
             } else if (response.result !== undefined) {
-              responsesReceived++;
               items[response.id].future.resolve(response.result);
             }
           },
@@ -117,8 +146,7 @@ export const createStreamingBatchedFunction = <Payload, Result extends object>(
             for (const { future } of items) future.reject(normalizedError);
           },
           complete: () => {
-            const streamTerminatedPrematurely = responsesReceived !== items.length;
-            if (streamTerminatedPrematurely) {
+            if (!isBatchDone) {
               const error: BatchedFunctionProtocolError = {
                 message: 'Connection terminated prematurely.',
                 code: 'CONNECTION',

src/plugins/bfetch/public/batching/types.ts

@@ -0,0 +1,31 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { Defer } from '../../../kibana_utils/public';
+
+export interface BatchItem<Payload, Result> {
+  payload: Payload;
+  future: Defer<Result>;
+  signal?: AbortSignal;
+}
+
+export type BatchedFunc<Payload, Result> = (
+  payload: Payload,
+  signal?: AbortSignal
+) => Promise<Result>;

src/plugins/bfetch/public/index.ts

@@ -23,6 +23,8 @@ import { BfetchPublicPlugin } from './plugin';
 export { BfetchPublicSetup, BfetchPublicStart, BfetchPublicContract } from './plugin';
 export { split } from './streaming';
 
+export { BatchedFunc } from './batching/types';
+
 export function plugin(initializerContext: PluginInitializerContext) {
   return new BfetchPublicPlugin(initializerContext);
 }

src/plugins/bfetch/public/plugin.ts

@@ -22,9 +22,9 @@ import { fetchStreaming as fetchStreamingStatic, FetchStreamingParams } from './
 import { removeLeadingSlash } from '../common';
 import {
   createStreamingBatchedFunction,
-  BatchedFunc,
   StreamingBatchedFunctionParams,
 } from './batching/create_streaming_batched_function';
+import { BatchedFunc } from './batching/types';
 
 // eslint-disable-next-line
 export interface BfetchPublicSetupDependencies {}

src/plugins/bfetch/public/streaming/fetch_streaming.test.ts

@@ -132,6 +132,33 @@ test('completes stream observable when request finishes', async () => {
   expect(spy).toHaveBeenCalledTimes(1);
 });
 
+test('completes stream observable when aborted', async () => {
+  const env = setup();
+  const abort = new AbortController();
+  const { stream } = fetchStreaming({
+    url: 'http://example.com',
+    signal: abort.signal,
+  });
+
+  const spy = jest.fn();
+  stream.subscribe({
+    complete: spy,
+  });
+
+  expect(spy).toHaveBeenCalledTimes(0);
+
+  (env.xhr as any).responseText = 'foo';
+  env.xhr.onprogress!({} as any);
+
+  abort.abort();
+
+  (env.xhr as any).readyState = 4;
+  (env.xhr as any).status = 200;
+  env.xhr.onreadystatechange!({} as any);
+
+  expect(spy).toHaveBeenCalledTimes(1);
+});
+
 test('promise throws when request errors', async () => {
   const env = setup();
   const { stream } = fetchStreaming({

src/plugins/bfetch/public/streaming/fetch_streaming.ts

@@ -24,6 +24,7 @@ export interface FetchStreamingParams {
   headers?: Record<string, string>;
   method?: 'GET' | 'POST';
   body?: string;
+  signal?: AbortSignal;
 }
 
 /**
@@ -35,6 +36,7 @@ export function fetchStreaming({
   headers = {},
   method = 'POST',
   body = '',
+  signal,
 }: FetchStreamingParams) {
   const xhr = new window.XMLHttpRequest();
 
@@ -45,7 +47,7 @@ export function fetchStreaming({
   // Set the HTTP headers
   Object.entries(headers).forEach(([k, v]) => xhr.setRequestHeader(k, v));
 
-  const stream = fromStreamingXhr(xhr);
+  const stream = fromStreamingXhr(xhr, signal);
 
   // Send the payload to the server
   xhr.send(body);