implement QuantumKVCache.setMany and QuantumKVCache.seleteMany

packages/backend/src/core/ChannelFollowingService.ts

@@ -17,7 +17,6 @@ import { InternalEventService } from './InternalEventService.js';
 
 @Injectable()
 export class ChannelFollowingService implements OnModuleInit {
-	// TODO check for regs
 	public userFollowingChannelsCache: QuantumKVCache<Set<string>>;
 
 	constructor(

packages/backend/src/core/GlobalEventService.ts

@@ -265,7 +265,7 @@ export interface InternalEventTypes {
 	unmute: { muterId: MiUser['id']; muteeId: MiUser['id']; };
 	userListMemberAdded: { userListId: MiUserList['id']; memberId: MiUser['id']; };
 	userListMemberRemoved: { userListId: MiUserList['id']; memberId: MiUser['id']; };
-	quantumCacheUpdated: { name: string, key: string, op: 's' | 'd' };
+	quantumCacheUpdated: { name: string, keys: string[], op: 's' | 'd' };
 }
 
 type EventTypesToEventPayload<T> = EventUnionFromDictionary<UndefinedAsNullAll<SerializedAll<T>>>;

packages/backend/src/core/UserListService.ts

@@ -70,16 +70,16 @@ export class UserListService implements OnApplicationShutdown, OnModuleInit {
 			switch (type) {
 				case 'userListMemberAdded': {
 					const { userListId, memberId } = body;
-					if (this.membersCache.has(userListId)) {
-						const members = await this.membersCache.get(userListId);
+					const members = this.membersCache.get(userListId);
+					if (members) {
 						members.add(memberId);
 					}
 					break;
 				}
 				case 'userListMemberRemoved': {
 					const { userListId, memberId } = body;
-					if (this.membersCache.has(userListId)) {
-						const members = await this.membersCache.get(userListId);
+					const members = this.membersCache.get(userListId);
+					if (members) {
 						members.delete(memberId);
 					}
 					break;

packages/backend/src/core/UserMutingService.ts

@@ -43,8 +43,6 @@ export class UserMutingService {
 			id: In(mutings.map(m => m.id)),
 		});
 
-		await Promise.all(Array
-			.from(new Set(mutings.map(m => m.muterId)))
-			.map(muterId => this.cacheService.userMutingsCache.delete(muterId)));
+		await this.cacheService.userMutingsCache.deleteMany(mutings.map(m => m.muterId));
 	}
 }

packages/backend/src/core/UserRenoteMutingService.ts

@@ -44,8 +44,6 @@ export class UserRenoteMutingService {
 			id: In(mutings.map(m => m.id)),
 		});
 
-		await Promise.all(Array
-			.from(new Set(mutings.map(m => m.muterId)))
-			.map(muterId => this.cacheService.renoteMutingsCache.delete(muterId)));
+		await this.cacheService.renoteMutingsCache.deleteMany(mutings.map(m => m.muterId));
 	}
 }

packages/backend/src/misc/cache.ts

@@ -531,19 +531,54 @@ export class QuantumKVCache<T> implements Iterable<[key: string, value: T]> {
 
 		this.memoryCache.set(key, value);
 
-		await this.internalEventService.emit('quantumCacheUpdated', { name: this.name, op: 's', key });
+		await this.internalEventService.emit('quantumCacheUpdated', { name: this.name, op: 's', keys: [key] });
 
 		if (this.onSet) {
 			await this.onSet(key, this);
 		}
 	}
 
+	/**
+	 * Creates or updates multiple value in the cache, and erases any stale caches across the cluster.
+	 * Fires an onSet for each changed item event after the cache has been updated in all processes.
+	 * Skips if all values are unchanged.
+	 */
+	@bindThis
+	public async setMany(items: Iterable<[key: string, value: T]>): Promise<void> {
+		const changedKeys: string[] = [];
+
+		for (const item of items) {
+			if (this.memoryCache.get(item[0]) !== item[1]) {
+				changedKeys.push(item[0]);
+				this.memoryCache.set(item[0], item[1]);
+			}
+		}
+
+		if (changedKeys.length > 0) {
+			await this.internalEventService.emit('quantumCacheUpdated', { name: this.name, op: 's', keys: changedKeys });
+
+			if (this.onSet) {
+				for (const key of changedKeys) {
+					await this.onSet(key, this);
+				}
+			}
+		}
+	}
+
+	/**
+	 * Gets a value from the local memory cache, or returns undefined if not found.
+	 */
+	@bindThis
+	public get(key: string): T | undefined {
+		return this.memoryCache.get(key);
+	}
+
 	/**
 	 * Gets or fetches a value from the cache.
 	 * Fires an onSet event, but does not emit an update event to other processes.
 	 */
 	@bindThis
-	public async get(key: string): Promise<T> {
+	public async fetch(key: string): Promise<T> {
 		let value = this.memoryCache.get(key);
 		if (value === undefined) {
 			value = await this.fetcher(key, this);
@@ -556,15 +591,6 @@ export class QuantumKVCache<T> implements Iterable<[key: string, value: T]> {
 		return value;
 	}
 
-	/**
-	 * Alias to get(), included for backwards-compatibility with RedisKVCache.
-	 * @deprecated use get() instead
-	 */
-	@bindThis
-	public async fetch(key: string): Promise<T> {
-		return await this.get(key);
-	}
-
 	/**
 	 * Returns true is a key exists in memory.
 	 * This applies to the local subset view, not the cross-cluster cache state.
@@ -582,12 +608,35 @@ export class QuantumKVCache<T> implements Iterable<[key: string, value: T]> {
 	public async delete(key: string): Promise<void> {
 		this.memoryCache.delete(key);
 
-		await this.internalEventService.emit('quantumCacheUpdated', { name: this.name, op: 'd', key });
+		await this.internalEventService.emit('quantumCacheUpdated', { name: this.name, op: 'd', keys: [key] });
 
 		if (this.onDelete) {
 			await this.onDelete(key, this);
 		}
 	}
+	/**
+	 * Deletes multiple values from the cache, and erases any stale caches across the cluster.
+	 * Fires an onDelete event for each key after the cache has been updated in all processes.
+	 * Skips if the input is empty.
+	 */
+	@bindThis
+	public async deleteMany(keys: string[]): Promise<void> {
+		if (keys.length === 0) {
+			return;
+		}
+
+		for (const key of keys) {
+			this.memoryCache.delete(key);
+		}
+
+		await this.internalEventService.emit('quantumCacheUpdated', { name: this.name, op: 'd', keys });
+
+		if (this.onDelete) {
+			for (const key of keys) {
+				await this.onDelete(key, this);
+			}
+		}
+	}
 
 	/**
 	 * Refreshes the value of a key from the fetcher, and erases any stale caches across the cluster.
@@ -623,14 +672,16 @@ export class QuantumKVCache<T> implements Iterable<[key: string, value: T]> {
 	@bindThis
 	private async onQuantumCacheUpdated(data: InternalEventTypes['quantumCacheUpdated']): Promise<void> {
 		if (data.name === this.name) {
-			this.memoryCache.delete(data.key);
+			for (const key of data.keys) {
+				this.memoryCache.delete(key);
 
 				if (data.op === 's' && this.onSet) {
-				await this.onSet(data.key, this);
+					await this.onSet(key, this);
 				}
 
 				if (data.op === 'd' && this.onDelete) {
-				await this.onDelete(data.key, this);
+					await this.onDelete(key, this);
+				}
 			}
 		}
 	}

packages/backend/test/unit/misc/cache.ts

@@ -73,7 +73,7 @@ describe(QuantumKVCache, () => {
 
 		await cache.set('foo', 'bar');
 
-		expect(fakeInternalEventService._calls).toContainEqual(['emit', ['quantumCacheUpdated', { name: 'fake', op: 's', key: 'foo' }]]);
+		expect(fakeInternalEventService._calls).toContainEqual(['emit', ['quantumCacheUpdated', { name: 'fake', op: 's', keys: ['foo'] }]]);
 	});
 
 	it('should call onSet when storing', async () => {
@@ -110,13 +110,13 @@ describe(QuantumKVCache, () => {
 		expect(fakeOnSet).toHaveBeenCalledTimes(1);
 	});
 
-	it('should fetch when getting an unknown value', async () => {
+	it('should fetch an unknown value', async () => {
 		const cache = makeCache<string>({
 			name: 'fake',
 			fetcher: key => `value#${key}`,
 		});
 
-		const result = await cache.get('foo');
+		const result = await cache.fetch('foo');
 
 		expect(result).toBe('value#foo');
 	});
@@ -127,7 +127,7 @@ describe(QuantumKVCache, () => {
 			fetcher: key => `value#${key}`,
 		});
 
-		await cache.get('foo');
+		await cache.fetch('foo');
 
 		const result = cache.has('foo');
 		expect(result).toBe(true);
@@ -141,7 +141,7 @@ describe(QuantumKVCache, () => {
 			onSet: fakeOnSet,
 		});
 
-		await cache.get('foo');
+		await cache.fetch('foo');
 
 		expect(fakeOnSet).toHaveBeenCalledWith('foo', cache);
 	});
@@ -152,9 +152,9 @@ describe(QuantumKVCache, () => {
 			fetcher: key => `value#${key}`,
 		});
 
-		await cache.get('foo');
+		await cache.fetch('foo');
 
-		expect(fakeInternalEventService._calls).not.toContainEqual(['emit', ['quantumCacheUpdated', { name: 'fake', op: 's', key: 'foo' }]]);
+		expect(fakeInternalEventService._calls).not.toContainEqual(['emit', ['quantumCacheUpdated', { name: 'fake', op: 's', keys: ['foo'] }]]);
 	});
 
 	it('should delete from memory cache', async () => {
@@ -186,14 +186,14 @@ describe(QuantumKVCache, () => {
 		await cache.set('foo', 'bar');
 		await cache.delete('foo');
 
-		expect(fakeInternalEventService._calls).toContainEqual(['emit', ['quantumCacheUpdated', { name: 'fake', op: 'd', key: 'foo' }]]);
+		expect(fakeInternalEventService._calls).toContainEqual(['emit', ['quantumCacheUpdated', { name: 'fake', op: 'd', keys: ['foo'] }]]);
 	});
 
 	it('should delete when receiving set event', async () => {
 		const cache = makeCache<string>({ name: 'fake' });
 		await cache.set('foo', 'bar');
 
-		await fakeInternalEventService._emitRedis('quantumCacheUpdated', { name: 'fake', op: 's', key: 'foo' });
+		await fakeInternalEventService._emitRedis('quantumCacheUpdated', { name: 'fake', op: 's', keys: ['foo'] });
 
 		const result = cache.has('foo');
 		expect(result).toBe(false);
@@ -206,7 +206,7 @@ describe(QuantumKVCache, () => {
 			onSet: fakeOnSet,
 		});
 
-		await fakeInternalEventService._emitRedis('quantumCacheUpdated', { name: 'fake', op: 's', key: 'foo' });
+		await fakeInternalEventService._emitRedis('quantumCacheUpdated', { name: 'fake', op: 's', keys: ['foo'] });
 
 		expect(fakeOnSet).toHaveBeenCalledWith('foo', cache);
 	});
@@ -215,7 +215,7 @@ describe(QuantumKVCache, () => {
 		const cache = makeCache<string>({ name: 'fake' });
 		await cache.set('foo', 'bar');
 
-		await fakeInternalEventService._emitRedis('quantumCacheUpdated', { name: 'fake', op: 'd', key: 'foo' });
+		await fakeInternalEventService._emitRedis('quantumCacheUpdated', { name: 'fake', op: 'd', keys: ['foo'] });
 
 		const result = cache.has('foo');
 		expect(result).toBe(false);
@@ -229,26 +229,130 @@ describe(QuantumKVCache, () => {
 		});
 		await cache.set('foo', 'bar');
 
-		await fakeInternalEventService._emitRedis('quantumCacheUpdated', { name: 'fake', op: 'd', key: 'foo' });
+		await fakeInternalEventService._emitRedis('quantumCacheUpdated', { name: 'fake', op: 'd', keys: ['foo'] });
 
 		expect(fakeOnDelete).toHaveBeenCalledWith('foo', cache);
 	});
 
-	describe('fetch', () => {
-		it('should perform same logic as get', async () => {
+	describe('get', () => {
+		it('should return value if present', async () => {
+			const cache = makeCache<string>();
+			await cache.set('foo', 'bar');
+
+			const result = cache.get('foo');
+
+			expect(result).toBe('bar');
+		});
+		it('should return undefined if missing', () => {
+			const cache = makeCache<string>();
+
+			const result = cache.get('foo');
+
+			expect(result).toBe(undefined);
+		});
+	});
+
+	describe('setMany', () => {
+		it('should populate all values', async () => {
+			const cache = makeCache<string>();
+
+			await cache.setMany([['foo', 'bar'], ['alpha', 'omega']]);
+
+			expect(cache.has('foo')).toBe(true);
+			expect(cache.has('alpha')).toBe(true);
+		});
+
+		it('should emit one event', async () => {
+			const cache = makeCache<string>({
+				name: 'fake',
+			});
+
+			await cache.setMany([['foo', 'bar'], ['alpha', 'omega']]);
+
+			expect(fakeInternalEventService._calls).toContainEqual(['emit', ['quantumCacheUpdated', { name: 'fake', op: 's', keys: ['foo', 'alpha'] }]]);
+			expect(fakeInternalEventService._calls.filter(c => c[0] === 'emit')).toHaveLength(1);
+		});
+
+		it('should call onSet for each item', async () => {
 			const fakeOnSet = jest.fn(() => Promise.resolve());
 			const cache = makeCache<string>({
 				name: 'fake',
-				fetcher: key => `value#${key}`,
 				onSet: fakeOnSet,
 			});
 
-			// noinspection JSDeprecatedSymbols
-			const result = await cache.fetch('foo');
+			await cache.setMany([['foo', 'bar'], ['alpha', 'omega']]);
 
-			expect(result).toBe('value#foo');
 			expect(fakeOnSet).toHaveBeenCalledWith('foo', cache);
-			expect(fakeInternalEventService._calls).not.toContainEqual(['emit', ['quantumCacheUpdated', { name: 'fake', op: 's', key: 'foo' }]]);
+			expect(fakeOnSet).toHaveBeenCalledWith('alpha', cache);
+		});
+
+		it('should emit events only for changed items', async () => {
+			const fakeOnSet = jest.fn(() => Promise.resolve());
+			const cache = makeCache<string>({
+				name: 'fake',
+				onSet: fakeOnSet,
+			});
+
+			await cache.set('foo', 'bar');
+			fakeOnSet.mockClear();
+			fakeInternalEventService._reset();
+
+			await cache.setMany([['foo', 'bar'], ['alpha', 'omega']]);
+
+			expect(fakeInternalEventService._calls).toContainEqual(['emit', ['quantumCacheUpdated', { name: 'fake', op: 's', keys: ['alpha'] }]]);
+			expect(fakeInternalEventService._calls.filter(c => c[0] === 'emit')).toHaveLength(1);
+			expect(fakeOnSet).toHaveBeenCalledWith('alpha', cache);
+			expect(fakeOnSet).toHaveBeenCalledTimes(1);
+		});
+	});
+
+	describe('deleteMany', () => {
+		it('should remove keys from memory cache', async () => {
+			const cache = makeCache<string>();
+
+			await cache.set('foo', 'bar');
+			await cache.set('alpha', 'omega');
+			await cache.deleteMany(['foo', 'alpha']);
+
+			expect(cache.has('foo')).toBe(false);
+			expect(cache.has('alpha')).toBe(false);
+		});
+
+		it('should emit only one event', async () => {
+			const cache = makeCache<string>({
+				name: 'fake',
+			});
+
+			await cache.deleteMany(['foo', 'alpha']);
+
+			expect(fakeInternalEventService._calls).toContainEqual(['emit', ['quantumCacheUpdated', { name: 'fake', op: 'd', keys: ['foo', 'alpha'] }]]);
+			expect(fakeInternalEventService._calls.filter(c => c[0] === 'emit')).toHaveLength(1);
+		});
+
+		it('should call onDelete for each key', async () => {
+			const fakeOnDelete = jest.fn(() => Promise.resolve());
+			const cache = makeCache<string>({
+				name: 'fake',
+				onDelete: fakeOnDelete,
+			});
+
+			await cache.deleteMany(['foo', 'alpha']);
+
+			expect(fakeOnDelete).toHaveBeenCalledWith('foo', cache);
+			expect(fakeOnDelete).toHaveBeenCalledWith('alpha', cache);
+		});
+
+		it('should do nothing if no keys are provided', async () => {
+			const fakeOnDelete = jest.fn(() => Promise.resolve());
+			const cache = makeCache<string>({
+				name: 'fake',
+				onDelete: fakeOnDelete,
+			});
+
+			await cache.deleteMany([]);
+
+			expect(fakeOnDelete).not.toHaveBeenCalled();
+			expect(fakeInternalEventService._calls.filter(c => c[0] === 'emit')).toHaveLength(0);
 		});
 	});
 
@@ -296,7 +400,7 @@ describe(QuantumKVCache, () => {
 				onSet: fakeOnSet,
 			});
 
-			await cache.refresh('foo')
+			await cache.refresh('foo');
 
 			expect(fakeOnSet).toHaveBeenCalledWith('foo', cache);
 		});
@@ -309,7 +413,7 @@ describe(QuantumKVCache, () => {
 
 			await cache.refresh('foo');
 
-			expect(fakeInternalEventService._calls).toContainEqual(['emit', ['quantumCacheUpdated', { name: 'fake', op: 's', key: 'foo' }]]);
+			expect(fakeInternalEventService._calls).toContainEqual(['emit', ['quantumCacheUpdated', { name: 'fake', op: 's', keys: ['foo'] }]]);
 		});
 	});