feat: return lifecycle state in feature overview (#6920)

src/lib/features/feature-lifecycle/fake-feature-lifecycle-read-model.ts

@@ -0,0 +1,12 @@
+import type { IFeatureLifecycleReadModel } from './feature-lifecycle-read-model-type';
+import type { IFeatureLifecycleStage } from '../../types';
+
+export class FakeFeatureLifecycleReadModel
+    implements IFeatureLifecycleReadModel
+{
+    findCurrentStage(
+        feature: string,
+    ): Promise<IFeatureLifecycleStage | undefined> {
+        return Promise.resolve(undefined);
+    }
+}

src/lib/features/feature-lifecycle/feature-lifecycle-read-model-type.ts

@@ -0,0 +1,7 @@
+import type { IFeatureLifecycleStage } from '../../types';
+
+export interface IFeatureLifecycleReadModel {
+    findCurrentStage(
+        feature: string,
+    ): Promise<IFeatureLifecycleStage | undefined>;
+}

src/lib/features/feature-lifecycle/feature-lifecycle-read-model.ts

@@ -0,0 +1,33 @@
+import type { Db } from '../../db/db';
+import type { IFeatureLifecycleReadModel } from './feature-lifecycle-read-model-type';
+import { getCurrentStage } from './get-current-stage';
+import type { IFeatureLifecycleStage, StageName } from '../../types';
+
+type DBType = {
+    feature: string;
+    stage: StageName;
+    created_at: Date;
+};
+
+export class FeatureLifecycleReadModel implements IFeatureLifecycleReadModel {
+    private db: Db;
+
+    constructor(db: Db) {
+        this.db = db;
+    }
+
+    async findCurrentStage(
+        feature: string,
+    ): Promise<IFeatureLifecycleStage | undefined> {
+        const results = await this.db('feature_lifecycles')
+            .where({ feature })
+            .orderBy('created_at', 'asc');
+
+        const stages = results.map(({ stage, created_at }: DBType) => ({
+            stage,
+            enteredStageAt: created_at,
+        }));
+
+        return getCurrentStage(stages);
+    }
+}

src/lib/features/feature-lifecycle/feature-lifecycle-service.test.ts

@@ -5,10 +5,10 @@ import {
     FEATURE_CREATED,
     type IEnvironment,
     type IUnleashConfig,
+    type StageName,
 } from '../../types';
 import { createFakeFeatureLifecycleService } from './createFeatureLifecycle';
 import EventEmitter from 'events';
-import type { StageName } from './feature-lifecycle-store-type';
 import { STAGE_ENTERED } from './feature-lifecycle-service';
 import noLoggerProvider from '../../../test/fixtures/no-logger';
 

src/lib/features/feature-lifecycle/feature-lifecycle-store-type.ts

@@ -1,21 +1,11 @@
-export type StageName =
+import type { IFeatureLifecycleStage, StageName } from '../../types';
-    | 'initial'
-    | 'pre-live'
-    | 'live'
-    | 'completed'
-    | 'archived';
 
 export type FeatureLifecycleStage = {
     feature: string;
     stage: StageName;
 };
 
-export type FeatureLifecycleStageView = {
+export type FeatureLifecycleView = IFeatureLifecycleStage[];
-    stage: StageName;
-    enteredStageAt: Date;
-};
-
-export type FeatureLifecycleView = FeatureLifecycleStageView[];
 
 export interface IFeatureLifecycleStore {
     insert(featureLifecycleStage: FeatureLifecycleStage): Promise<void>;

src/lib/features/feature-lifecycle/feature-lifecycle-store.ts

@@ -2,9 +2,9 @@ import type {
     FeatureLifecycleStage,
     IFeatureLifecycleStore,
     FeatureLifecycleView,
-    StageName,
 } from './feature-lifecycle-store-type';
 import type { Db } from '../../db/db';
+import type { StageName } from '../../types';
 
 type DBType = {
     feature: string;

src/lib/features/feature-lifecycle/feature-lifecycle.e2e.test.ts

@@ -9,13 +9,13 @@ import {
     FEATURE_ARCHIVED,
     FEATURE_CREATED,
     type IEventStore,
+    type StageName,
 } from '../../types';
 import type EventEmitter from 'events';
 import {
     type FeatureLifecycleService,
     STAGE_ENTERED,
 } from './feature-lifecycle-service';
-import type { StageName } from './feature-lifecycle-store-type';
 
 let app: IUnleashTest;
 let db: ITestDb;
@@ -69,10 +69,22 @@ function reachedStage(name: StageName) {
     );
 }
 
+const expectFeatureStage = async (stage: StageName) => {
+    const { body: feature } = await app.getProjectFeatures(
+        'default',
+        'my_feature_a',
+    );
+    expect(feature.lifecycle).toMatchObject({
+        stage,
+        enteredStageAt: expect.any(String),
+    });
+};
+
 test('should return lifecycle stages', async () => {
     await app.createFeature('my_feature_a');
     eventStore.emit(FEATURE_CREATED, { featureName: 'my_feature_a' });
     await reachedStage('initial');
+    await expectFeatureStage('initial');
     eventBus.emit(CLIENT_METRICS, {
         featureName: 'my_feature_a',
         environment: 'default',
@@ -87,6 +99,7 @@ test('should return lifecycle stages', async () => {
         environment: 'non-existent',
     });
     await reachedStage('live');
+    await expectFeatureStage('live');
     eventStore.emit(FEATURE_ARCHIVED, { featureName: 'my_feature_a' });
     await reachedStage('archived');
 
@@ -97,4 +110,6 @@ test('should return lifecycle stages', async () => {
         { stage: 'live', enteredStageAt: expect.any(String) },
         { stage: 'archived', enteredStageAt: expect.any(String) },
     ]);
+
+    await expectFeatureStage('archived');
 });

src/lib/features/feature-lifecycle/get-current-stage.test.ts

@@ -0,0 +1,39 @@
+import { getCurrentStage } from './get-current-stage';
+import type { IFeatureLifecycleStage } from '../../types';
+
+const irrelevantDate = new Date('2024-04-22T10:00:00Z');
+
+describe('getCurrentStage', () => {
+    it('should return the first matching stage based on the preferred order', () => {
+        const stages: IFeatureLifecycleStage[] = [
+            {
+                stage: 'initial',
+                enteredStageAt: irrelevantDate,
+            },
+            {
+                stage: 'completed',
+                enteredStageAt: irrelevantDate,
+            },
+            {
+                stage: 'archived',
+                enteredStageAt: irrelevantDate,
+            },
+            { stage: 'live', enteredStageAt: irrelevantDate },
+        ];
+
+        const result = getCurrentStage(stages);
+
+        expect(result).toEqual({
+            stage: 'archived',
+            enteredStageAt: irrelevantDate,
+        });
+    });
+
+    it('should handle an empty stages array', () => {
+        const stages: IFeatureLifecycleStage[] = [];
+
+        const result = getCurrentStage(stages);
+
+        expect(result).toBeUndefined();
+    });
+});

src/lib/features/feature-lifecycle/get-current-stage.ts

@@ -0,0 +1,23 @@
+import type { IFeatureLifecycleStage, StageName } from '../../types';
+
+const preferredOrder: StageName[] = [
+    'archived',
+    'completed',
+    'live',
+    'pre-live',
+    'initial',
+];
+
+export function getCurrentStage(
+    stages: IFeatureLifecycleStage[],
+): IFeatureLifecycleStage | undefined {
+    for (const preferredStage of preferredOrder) {
+        const foundStage = stages.find(
+            (stage) => stage.stage === preferredStage,
+        );
+        if (foundStage) {
+            return foundStage;
+        }
+    }
+    return undefined;
+}

src/lib/features/feature-toggle/createFeatureToggleService.ts

@@ -53,6 +53,8 @@ import {
 } from '../dependent-features/createDependentFeaturesService';
 import { createEventsService } from '../events/createEventsService';
 import { EventEmitter } from 'stream';
+import { FeatureLifecycleReadModel } from '../feature-lifecycle/feature-lifecycle-read-model';
+import { FakeFeatureLifecycleReadModel } from '../feature-lifecycle/fake-feature-lifecycle-read-model';
 
 export const createFeatureToggleService = (
     db: Db,
@@ -122,6 +124,8 @@ export const createFeatureToggleService = (
 
     const dependentFeaturesReadModel = new DependentFeaturesReadModel(db);
 
+    const featureLifecycleReadModel = new FeatureLifecycleReadModel(db);
+
     const dependentFeaturesService = createDependentFeaturesService(config)(db);
 
     const featureToggleService = new FeatureToggleService(
@@ -143,6 +147,7 @@ export const createFeatureToggleService = (
         privateProjectChecker,
         dependentFeaturesReadModel,
         dependentFeaturesService,
+        featureLifecycleReadModel,
     );
     return featureToggleService;
 };
@@ -185,6 +190,8 @@ export const createFakeFeatureToggleService = (
     const fakePrivateProjectChecker = createFakePrivateProjectChecker();
     const dependentFeaturesReadModel = new FakeDependentFeaturesReadModel();
     const dependentFeaturesService = createFakeDependentFeaturesService(config);
+    const featureLifecycleReadModel = new FakeFeatureLifecycleReadModel();
+
     const featureToggleService = new FeatureToggleService(
         {
             featureStrategiesStore,
@@ -204,6 +211,7 @@ export const createFakeFeatureToggleService = (
         fakePrivateProjectChecker,
         dependentFeaturesReadModel,
         dependentFeaturesService,
+        featureLifecycleReadModel,
     );
     return featureToggleService;
 };

src/lib/features/feature-toggle/feature-toggle-service.ts

@@ -15,7 +15,7 @@ import {
     type FeatureToggle,
     type FeatureToggleDTO,
     type FeatureToggleLegacy,
-    type FeatureToggleWithDependencies,
+    type FeatureToggleView,
     type FeatureToggleWithEnvironment,
     FeatureUpdatedEvent,
     FeatureVariantEvent,
@@ -24,6 +24,7 @@ import {
     type IDependency,
     type IFeatureEnvironmentInfo,
     type IFeatureEnvironmentStore,
+    type IFeatureLifecycleStage,
     type IFeatureNaming,
     type IFeatureOverview,
     type IFeatureStrategy,
@@ -108,6 +109,7 @@ import ArchivedFeatureError from '../../error/archivedfeature-error';
 import { FEATURES_CREATED_BY_PROCESSED } from '../../metric-events';
 import { allSettledWithRejection } from '../../util/allSettledWithRejection';
 import type EventEmitter from 'node:events';
+import type { IFeatureLifecycleReadModel } from '../feature-lifecycle/feature-lifecycle-read-model-type';
 
 interface IFeatureContext {
     featureName: string;
@@ -173,6 +175,8 @@ class FeatureToggleService {
 
     private dependentFeaturesReadModel: IDependentFeaturesReadModel;
 
+    private featureLifecycleReadModel: IFeatureLifecycleReadModel;
+
     private dependentFeaturesService: DependentFeaturesService;
 
     private eventBus: EventEmitter;
@@ -210,6 +214,7 @@ class FeatureToggleService {
         privateProjectChecker: IPrivateProjectChecker,
         dependentFeaturesReadModel: IDependentFeaturesReadModel,
         dependentFeaturesService: DependentFeaturesService,
+        featureLifecycleReadModel: IFeatureLifecycleReadModel,
     ) {
         this.logger = getLogger('services/feature-toggle-service.ts');
         this.featureStrategiesStore = featureStrategiesStore;
@@ -228,6 +233,7 @@ class FeatureToggleService {
         this.privateProjectChecker = privateProjectChecker;
         this.dependentFeaturesReadModel = dependentFeaturesReadModel;
         this.dependentFeaturesService = dependentFeaturesService;
+        this.featureLifecycleReadModel = featureLifecycleReadModel;
         this.eventBus = eventBus;
     }
 
@@ -980,7 +986,7 @@ class FeatureToggleService {
         projectId,
         environmentVariants,
         userId,
-    }: IGetFeatureParams): Promise<FeatureToggleWithDependencies> {
+    }: IGetFeatureParams): Promise<FeatureToggleView> {
         if (projectId) {
             await this.validateFeatureBelongsToProject({
                 featureName,
@@ -990,9 +996,11 @@ class FeatureToggleService {
 
         let dependencies: IDependency[] = [];
         let children: string[] = [];
-        [dependencies, children] = await Promise.all([
+        let lifecycle: IFeatureLifecycleStage | undefined = undefined;
+        [dependencies, children, lifecycle] = await Promise.all([
             this.dependentFeaturesReadModel.getParents(featureName),
             this.dependentFeaturesReadModel.getChildren([featureName]),
+            this.featureLifecycleReadModel.findCurrentStage(featureName),
         ]);
 
         if (environmentVariants) {
@@ -1006,6 +1014,7 @@ class FeatureToggleService {
                 ...result,
                 dependencies,
                 children,
+                lifecycle,
             };
         } else {
             const result =
@@ -1018,6 +1027,7 @@ class FeatureToggleService {
                 ...result,
                 dependencies,
                 children,
+                lifecycle,
             };
         }
     }

src/lib/openapi/spec/feature-schema.ts

@@ -130,6 +130,32 @@ export const featureSchema = {
                 example: 'some-feature',
             },
         },
+        lifecycle: {
+            type: 'object',
+            description: 'Current lifecycle stage of the feature',
+            additionalProperties: false,
+            required: ['stage', 'enteredStageAt'],
+            properties: {
+                stage: {
+                    description: 'The name of the current lifecycle stage',
+                    type: 'string',
+                    enum: [
+                        'initial',
+                        'pre-live',
+                        'live',
+                        'completed',
+                        'archived',
+                    ],
+                    example: 'initial',
+                },
+                enteredStageAt: {
+                    description: 'When the feature entered this stage',
+                    type: 'string',
+                    format: 'date-time',
+                    example: '2023-01-28T15:21:39.975Z',
+                },
+            },
+        },
         dependencies: {
             type: 'array',
             items: {

src/lib/services/feature-service-potentially-stale.test.ts

@@ -14,6 +14,7 @@ import type { IDependentFeaturesReadModel } from '../features/dependent-features
 import EventService from '../features/events/event-service';
 import FakeFeatureTagStore from '../../test/fixtures/fake-feature-tag-store';
 import type { DependentFeaturesService } from '../features/dependent-features/dependent-features-service';
+import type { IFeatureLifecycleReadModel } from '../features/feature-lifecycle/feature-lifecycle-read-model-type';
 
 test('Should only store events for potentially stale on', async () => {
     expect.assertions(2);
@@ -66,6 +67,7 @@ test('Should only store events for potentially stale on', async () => {
         {} as IPrivateProjectChecker,
         {} as IDependentFeaturesReadModel,
         {} as DependentFeaturesService,
+        {} as IFeatureLifecycleReadModel,
     );
 
     await featureToggleService.updatePotentiallyStaleFeatures();

src/lib/services/index.ts

@@ -129,6 +129,8 @@ import { JobService } from '../features/scheduler/job-service';
 import { JobStore } from '../features/scheduler/job-store';
 import { FeatureLifecycleService } from '../features/feature-lifecycle/feature-lifecycle-service';
 import { createFakeFeatureLifecycleService } from '../features/feature-lifecycle/createFeatureLifecycle';
+import { FeatureLifecycleReadModel } from '../features/feature-lifecycle/feature-lifecycle-read-model';
+import { FakeFeatureLifecycleReadModel } from '../features/feature-lifecycle/fake-feature-lifecycle-read-model';
 
 export const createServices = (
     stores: IUnleashStores,
@@ -158,6 +160,9 @@ export const createServices = (
     const dependentFeaturesReadModel = db
         ? new DependentFeaturesReadModel(db)
         : new FakeDependentFeaturesReadModel();
+    const featureLifecycleReadModel = db
+        ? new FeatureLifecycleReadModel(db)
+        : new FakeFeatureLifecycleReadModel();
     const segmentReadModel = db
         ? new SegmentReadModel(db)
         : new FakeSegmentReadModel();
@@ -258,6 +263,7 @@ export const createServices = (
         privateProjectChecker,
         dependentFeaturesReadModel,
         dependentFeaturesService,
+        featureLifecycleReadModel,
     );
     const transactionalEnvironmentService = db
         ? withTransactional(createEnvironmentService(config), db)

src/lib/types/model.ts

@@ -103,10 +103,10 @@ export interface FeatureToggleWithEnvironment extends FeatureToggle {
     environments: IEnvironmentDetail[];
 }
 
-export interface FeatureToggleWithDependencies
+export interface FeatureToggleView extends FeatureToggleWithEnvironment {
-    extends FeatureToggleWithEnvironment {
     dependencies: IDependency[];
     children: string[];
+    lifecycle: IFeatureLifecycleStage | undefined;
 }
 
 // @deprecated
@@ -153,6 +153,17 @@ export interface IDependency {
     enabled?: boolean;
 }
 
+export type StageName =
+    | 'initial'
+    | 'pre-live'
+    | 'live'
+    | 'completed'
+    | 'archived';
+export interface IFeatureLifecycleStage {
+    stage: StageName;
+    enteredStageAt: Date;
+}
+
 export interface IFeatureDependency {
     feature: string;
     dependency: IDependency;