chore: split interfaces for import and export (#5004)

## About the changes
This splits the interfaces for import and export, especially because the
import functionality has to be replaced in enterprise repo.

This is a breaking change because of the service renames, but I'll have
the PR for the other repository ready so we reduce the time to fix. I
intentionally avoided doing it backward compatible because of time.

src/lib/features/export-import-toggles/export-import-controller.ts

@@ -1,7 +1,10 @@
 import { Response } from 'express';
 import Controller from '../../routes/controller';
 import { Logger } from '../../logger';
-import ExportImportService from './export-import-service';
+import ExportImportService, {
+    IExportService,
+    IImportService,
+} from './export-import-service';
 import { OpenApiService } from '../../services';
 import {
     TransactionCreator,
@@ -32,32 +35,31 @@ import ApiUser from '../../types/api-user';
 class ExportImportController extends Controller {
     private logger: Logger;
 
-    /** @deprecated gradually rolling out exportImportV2 */
-    private exportImportService: ExportImportService;
+    private exportService: IExportService;
 
-    /** @deprecated gradually rolling out exportImportV2 */
+    /** @deprecated gradually rolling out importService */
     private transactionalExportImportService: (
         db: UnleashTransaction,
-    ) => Pick<ExportImportService, 'import' | 'validate'>;
+    ) => IImportService;
 
-    private exportImportServiceV2: WithTransactional<ExportImportService>;
+    private importService: WithTransactional<IImportService>;
 
     private openApiService: OpenApiService;
 
-    /** @deprecated gradually rolling out exportImportV2 */
+    /** @deprecated gradually rolling out importService */
     private readonly startTransaction: TransactionCreator<UnleashTransaction>;
 
     constructor(
         config: IUnleashConfig,
         {
-            exportImportService,
+            exportService,
             transactionalExportImportService,
-            exportImportServiceV2,
+            importService,
             openApiService,
         }: Pick<
             IUnleashServices,
-            | 'exportImportService'
-            | 'exportImportServiceV2'
+            | 'exportService'
+            | 'importService'
             | 'openApiService'
             | 'transactionalExportImportService'
         >,
@@ -65,10 +67,10 @@ class ExportImportController extends Controller {
     ) {
         super(config);
         this.logger = config.getLogger('/admin-api/export-import.ts');
-        this.exportImportService = exportImportService;
+        this.exportService = exportService;
         this.transactionalExportImportService =
             transactionalExportImportService;
-        this.exportImportServiceV2 = exportImportServiceV2;
+        this.importService = importService;
         this.startTransaction = startTransaction;
         this.openApiService = openApiService;
         this.route({
@@ -141,12 +143,7 @@ class ExportImportController extends Controller {
         const query = req.body;
         const userName = extractUsername(req);
 
-        const useTransactionalDecorator = this.config.flagResolver.isEnabled(
-            'transactionalDecorator',
-        );
-        const data = useTransactionalDecorator
-            ? await this.exportImportServiceV2.export(query, userName)
-            : await this.exportImportService.export(query, userName);
+        const data = await this.exportService.export(query, userName);
 
         this.openApiService.respondWithValidation(
             200,
@@ -168,7 +165,7 @@ class ExportImportController extends Controller {
             'transactionalDecorator',
         );
         const validation = useTransactionalDecorator
-            ? await this.exportImportServiceV2.transactional((service) =>
+            ? await this.importService.transactional((service) =>
                   service.validate(dto, user),
               )
             : await this.startTransaction(async (tx) =>
@@ -203,7 +200,7 @@ class ExportImportController extends Controller {
         );
 
         if (useTransactionalDecorator) {
-            await this.exportImportServiceV2.transactional((service) =>
+            await this.importService.transactional((service) =>
                 service.import(dto, user),
             );
         } else {

src/lib/features/export-import-toggles/export-import-service.ts

@@ -50,7 +50,25 @@ import { ImportValidationMessages } from './import-validation-messages';
 import { findDuplicates } from '../../util/findDuplicates';
 import { FeatureNameCheckResultWithFeaturePattern } from '../feature-toggle/feature-toggle-service';
 
-export default class ExportImportService {
+export type IImportService = {
+    validate(
+        dto: ImportTogglesSchema,
+        user: User,
+    ): Promise<ImportTogglesValidateSchema>;
+
+    import(dto: ImportTogglesSchema, user: User): Promise<void>;
+};
+
+export type IExportService = {
+    export(
+        query: ExportQuerySchema,
+        userName: string,
+    ): Promise<ExportResultSchema>;
+};
+
+export default class ExportImportService
+    implements IExportService, IImportService
+{
     private logger: Logger;
 
     private toggleStore: IFeatureToggleStore;

src/lib/services/index.ts

@@ -299,7 +299,7 @@ export const createServices = (
     const exportImportService = db
         ? createExportImportTogglesService(db, config)
         : createFakeExportImportTogglesService(config);
-    const exportImportServiceV2 = db
+    const importService = db
         ? withTransactional(deferredExportImportTogglesService(config), db)
         : withFakeTransactional(createFakeExportImportTogglesService(config));
     const transactionalExportImportService = (txDb: Knex.Transaction) =>
@@ -403,9 +403,9 @@ export const createServices = (
         instanceStatsService,
         favoritesService,
         maintenanceService,
-        exportImportService,
+        exportService: exportImportService,
         transactionalExportImportService,
-        exportImportServiceV2,
+        importService,
         schedulerService,
         configurationRevisionService,
         transactionalFeatureToggleService,

src/lib/types/services.ts

@@ -39,7 +39,10 @@ import MaintenanceService from '../services/maintenance-service';
 import { AccountService } from '../services/account-service';
 import { SchedulerService } from '../services/scheduler-service';
 import { Knex } from 'knex';
-import ExportImportService from '../features/export-import-toggles/export-import-service';
+import {
+    IExportService,
+    IImportService,
+} from '../features/export-import-toggles/export-import-service';
 import { ISegmentService } from '../segments/segment-service-interface';
 import ConfigurationRevisionService from '../features/feature-toggle/configuration-revision-service';
 import EventAnnouncerService from 'lib/services/event-announcer-service';
@@ -89,16 +92,13 @@ export interface IUnleashServices {
     instanceStatsService: InstanceStatsService;
     favoritesService: FavoritesService;
     maintenanceService: MaintenanceService;
-    /** @deprecated prefer exportImportServiceV2, we're doing a gradual rollout */
-    exportImportService: ExportImportService;
-    exportImportServiceV2: WithTransactional<ExportImportService>;
+    exportService: IExportService;
+    importService: WithTransactional<IImportService>;
     configurationRevisionService: ConfigurationRevisionService;
     schedulerService: SchedulerService;
     eventAnnouncerService: EventAnnouncerService;
     /** @deprecated prefer exportImportServiceV2, we're doing a gradual rollout */
-    transactionalExportImportService: (
-        db: Knex.Transaction,
-    ) => Pick<ExportImportService, 'import' | 'validate'>;
+    transactionalExportImportService: (db: Knex.Transaction) => IImportService;
     transactionalFeatureToggleService: (
         db: Knex.Transaction,
     ) => FeatureToggleService;