Revert "[Search] Search batching using bfetch (#83418)"

This reverts commit 5708c5d.

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

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

@@ -14,7 +14,6 @@ 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>, { bfetch, expressions, usageCollection }: DataPluginSetupDependencies): {
+setup(core: CoreSetup<DataPluginStartDependencies, DataPluginStart>, { expressions, usageCollection }: DataPluginSetupDependencies): {
         __enhance: (enhancements: DataEnhancements) => void;
         search: ISearchSetup;
         fieldFormats: {
@@ -21,7 +21,7 @@ setup(core: CoreSetup<DataPluginStartDependencies, DataPluginStart>, { bfetch, e
 |  Parameter | Type | Description |
 |  --- | --- | --- |
 |  core | <code>CoreSetup&lt;DataPluginStartDependencies, DataPluginStart&gt;</code> |  |
-|  { bfetch, expressions, usageCollection } | <code>DataPluginSetupDependencies</code> |  |
+|  { 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 { AbortError, defer, of } from '../../../kibana_utils/public';
+import { defer, of } from '../../../kibana_utils/public';
 import { Subject } from 'rxjs';
 
 const getPromiseState = (promise: Promise<unknown>): Promise<'resolved' | 'rejected' | 'pending'> =>
@@ -168,28 +168,6 @@ 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({
@@ -445,73 +423,6 @@ 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 { AbortError, abortSignalToPromise, defer } from '../../../kibana_utils/public';
+import { defer, Defer } from '../../../kibana_utils/public';
 import {
   ItemBufferParams,
   TimedItemBufferParams,
@@ -27,7 +27,13 @@ import {
 } from '../../common';
 import { fetchStreaming, split } from '../streaming';
 import { normalizeError } from '../../common';
-import { BatchedFunc, BatchItem } from './types';
+
+export interface BatchItem<Payload, Result> {
+  payload: Payload;
+  future: Defer<Result>;
+}
+
+export type BatchedFunc<Payload, Result> = (payload: Payload) => Promise<Result>;
 
 export interface BatchedFunctionProtocolError extends ErrorLike {
   code: string;
@@ -76,67 +82,32 @@ export const createStreamingBatchedFunction = <Payload, Result extends object>(
     flushOnMaxItems = 25,
     maxItemAge = 10,
   } = params;
-  const [fn] = createBatchedFunction({
-    onCall: (payload: Payload, signal?: AbortSignal) => {
+  const [fn] = createBatchedFunction<BatchedFunc<Payload, Result>, BatchItem<Payload, Result>>({
+    onCall: (payload: Payload) => {
       const future = defer<Result>();
       const entry: BatchItem<Payload, Result> = {
         payload,
         future,
-        signal,
       };
       return [future.promise, entry];
     },
     onBatch: async (items) => {
       try {
-        // 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);
-
+        let responsesReceived = 0;
+        const batch = items.map(({ payload }) => 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);
             }
           },
@@ -146,7 +117,8 @@ export const createStreamingBatchedFunction = <Payload, Result extends object>(
             for (const { future } of items) future.reject(normalizedError);
           },
           complete: () => {
-            if (!isBatchDone) {
+            const streamTerminatedPrematurely = responsesReceived !== items.length;
+            if (streamTerminatedPrematurely) {
               const error: BatchedFunctionProtocolError = {
                 message: 'Connection terminated prematurely.',
                 code: 'CONNECTION',

src/plugins/bfetch/public/index.ts

@@ -23,8 +23,6 @@ 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

@@ -132,33 +132,6 @@ 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

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