[Files] Adds bulk delete method (elastic#155628)

## Summary

Closes elastic#154286


### Checklist

Delete any items that are not applicable to this PR.

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

### For maintainers

- [x] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

Co-authored-by: kibanamachine <[email protected]>

src/plugins/files/server/file_service/file_action_types.ts

@@ -62,6 +62,16 @@ export interface DeleteFileArgs {
   id: string;
 }
 
+/**
+ * Arguments to delete files in a bulk request.
+ */
+export interface BulkDeleteFilesArgs {
+  /**
+   * File IDs.
+   */
+  ids: string[];
+}
+
 /**
  * Arguments to get a file by ID.
  */

src/plugins/files/server/file_service/file_service.ts

@@ -12,6 +12,7 @@ import type {
   CreateFileArgs,
   UpdateFileArgs,
   DeleteFileArgs,
+  BulkDeleteFilesArgs,
   GetByIdArgs,
   FindFileArgs,
 } from './file_action_types';
@@ -43,6 +44,13 @@ export interface FileServiceStart {
    */
   delete(args: DeleteFileArgs): Promise<void>;
 
+  /**
+   * Delete multiple files at once.
+   *
+   * @param args - delete files args
+   */
+  bulkDelete(args: BulkDeleteFilesArgs): Promise<Array<PromiseSettledResult<void>>>;
+
   /**
    * Get a file by ID. Will throw if file cannot be found.
    *

src/plugins/files/server/file_service/file_service_factory.ts

@@ -94,7 +94,10 @@ export class FileServiceFactoryImpl implements FileServiceFactory {
         await internalFileService.updateFile(args);
       },
       async delete(args) {
-        return internalFileService.deleteFile(args);
+        return await internalFileService.deleteFile(args);
+      },
+      async bulkDelete(args) {
+        return await internalFileService.bulkDeleteFiles(args);
       },
       async getById<M>(args: GetByIdArgs) {
         return internalFileService.getById(args) as Promise<File<M>>;

src/plugins/files/server/file_service/internal_file_service.ts

@@ -8,6 +8,7 @@
 
 import { Logger, SavedObjectsErrorHelpers } from '@kbn/core/server';
 import { AuditEvent, AuditLogger } from '@kbn/security-plugin/server';
+import pLimit from 'p-limit';
 
 import { BlobStorageService } from '../blob_storage_service';
 import { InternalFileShareService } from '../file_share_service';
@@ -20,10 +21,14 @@ import type {
   CreateFileArgs,
   UpdateFileArgs,
   DeleteFileArgs,
+  BulkDeleteFilesArgs,
   FindFileArgs,
   GetByIdArgs,
 } from './file_action_types';
 import { createFileClient, FileClientImpl } from '../file_client/file_client';
+
+const bulkDeleteConcurrency = pLimit(10);
+
 /**
  * Service containing methods for working with files.
  *
@@ -64,6 +69,14 @@ export class InternalFileService {
     await file.delete();
   }
 
+  public async bulkDeleteFiles({
+    ids,
+  }: BulkDeleteFilesArgs): Promise<Array<PromiseSettledResult<void>>> {
+    const promises = ids.map((id) => bulkDeleteConcurrency(() => this.deleteFile({ id })));
+    const result = await Promise.allSettled(promises);
+    return result;
+  }
+
   private async get(id: string) {
     try {
       const { metadata } = await this.metadataClient.get({ id });

src/plugins/files/server/integration_tests/file_service.test.ts

@@ -99,7 +99,7 @@ describe('FileService', () => {
     return file;
   }
   afterEach(async () => {
-    await Promise.all(disposables.map((file) => file.delete()));
+    await fileService.bulkDelete({ ids: disposables.map((d) => d.id) });
     const { files } = await fileService.find({ kind: [fileKind] });
     expect(files.length).toBe(0);
     disposables = [];
@@ -246,14 +246,33 @@ describe('FileService', () => {
     expect(result3.files.length).toBe(2);
   });
 
-  it('deletes files', async () => {
+  it('deletes a single file', async () => {
     const file = await fileService.create({ fileKind, name: 'test' });
     const result = await fileService.find({ kind: [fileKind] });
     expect(result.files.length).toBe(1);
     await file.delete();
     expect(await fileService.find({ kind: [fileKind] })).toEqual({ files: [], total: 0 });
   });
 
+  it('deletes a single file using the bulk method', async () => {
+    const file = await fileService.create({ fileKind, name: 'test' });
+    const result = await fileService.find({ kind: [fileKind] });
+    expect(result.files.length).toBe(1);
+    await fileService.bulkDelete({ ids: [file.id] });
+    expect(await fileService.find({ kind: [fileKind] })).toEqual({ files: [], total: 0 });
+  });
+
+  it('deletes multiple files using the bulk method', async () => {
+    const promises = Array.from({ length: 15 }, (v, i) =>
+      fileService.create({ fileKind, name: 'test ' + i })
+    );
+    const files = await Promise.all(promises);
+    const result = await fileService.find({ kind: [fileKind] });
+    expect(result.files.length).toBe(15);
+    await fileService.bulkDelete({ ids: files.map((file) => file.id) });
+    expect(await fileService.find({ kind: [fileKind] })).toEqual({ files: [], total: 0 });
+  });
+
   interface CustomMeta {
     some: string;
   }

src/plugins/files/server/mocks.ts

@@ -15,6 +15,7 @@ import { FileClient, FileServiceFactory, FileServiceStart, FilesSetup } from '.'
 export const createFileServiceMock = (): DeeplyMockedKeys<FileServiceStart> => ({
   create: jest.fn(),
   delete: jest.fn(),
+  bulkDelete: jest.fn(),
   deleteShareObject: jest.fn(),
   find: jest.fn(),
   getById: jest.fn(),