feat: add is_vanished optimization with lazy hydration

vikashsiwach · vikashsiwach · commit 5436848136ec · 2026-04-18T18:08:03.000+05:30
diff --git a/migrations/20260410_230000_add_is_vanished_to_users_table.js b/migrations/20260410_230000_add_is_vanished_to_users_table.js
@@ -6,20 +6,12 @@ exports.up = async function (knex) {
   await knex.raw(`
     UPDATE users u
     SET is_vanished = true
-    FROM events e
-    WHERE u.pubkey = e.event_pubkey
-      AND e.event_kind = 62
-      AND e.deleted_at IS NULL
-  `)
-
-  await knex.raw(`
-    INSERT INTO users (pubkey, is_admitted, balance, is_vanished, created_at, updated_at)
-    SELECT DISTINCT e.event_pubkey, false, 0, true, NOW(), NOW()
-    FROM events e
-    LEFT JOIN users u ON u.pubkey = e.event_pubkey
-    WHERE e.event_kind = 62
-      AND e.deleted_at IS NULL
-      AND u.pubkey IS NULL
+    WHERE EXISTS (
+      SELECT 1 FROM events e
+      WHERE e.event_pubkey = u.pubkey
+        AND e.event_kind = 62
+        AND e.deleted_at IS NULL
+    )
   `)
 }
 
diff --git a/src/@types/repositories.ts b/src/@types/repositories.ts
@@ -62,4 +62,6 @@ export interface IUserRepository {
   findByPubkey(pubkey: Pubkey, client?: DatabaseClient): Promise<User | undefined>
   upsert(user: Partial<User>, client?: DatabaseClient): Promise<number>
   getBalanceByPubkey(pubkey: Pubkey, client?: DatabaseClient): Promise<bigint>
+  isVanished(pubkey: Pubkey, client?: DatabaseClient): Promise<boolean>
+  setVanished(pubkey: Pubkey, vanished: boolean, client?: DatabaseClient): Promise<number>
 }
diff --git a/src/@types/user.ts b/src/@types/user.ts
@@ -3,6 +3,7 @@ import { Pubkey } from './base'
 export interface User {
   pubkey: Pubkey
   isAdmitted: boolean
+  isVanished: boolean
   balance: bigint
   tosAcceptedAt?: Date | null
   createdAt: Date
@@ -12,6 +13,7 @@ export interface User {
 export interface DBUser {
   pubkey: Buffer
   is_admitted: boolean
+  is_vanished: boolean
   balance: bigint
   created_at: Date
   updated_at: Date
diff --git a/src/factories/controllers/get-admission-check-controller-factory.ts b/src/factories/controllers/get-admission-check-controller-factory.ts
@@ -1,12 +1,15 @@
+import { getMasterDbClient, getReadReplicaDbClient } from '../../database/client'
 import { createSettings } from '../settings-factory'
-import { getMasterDbClient } from '../../database/client'
+import { EventRepository } from '../../repositories/event-repository'
 import { GetSubmissionCheckController } from '../../controllers/admission/get-admission-check-controller'
 import { slidingWindowRateLimiterFactory } from '../rate-limiter-factory'
 import { UserRepository } from '../../repositories/user-repository'
 
 export const createGetAdmissionCheckController = () => {
   const dbClient = getMasterDbClient()
-  const userRepository = new UserRepository(dbClient)
+  const readReplicaDbClient = getReadReplicaDbClient()
+  const eventRepository = new EventRepository(dbClient, readReplicaDbClient)
+  const userRepository = new UserRepository(dbClient, eventRepository)
   
   return new GetSubmissionCheckController(
     userRepository,
diff --git a/src/factories/controllers/post-invoice-controller-factory.ts b/src/factories/controllers/post-invoice-controller-factory.ts
@@ -1,14 +1,17 @@
+import { getMasterDbClient, getReadReplicaDbClient } from '../../database/client'
 import { createPaymentsService } from '../payments-service-factory'
 import { createSettings } from '../settings-factory'
-import { getMasterDbClient } from '../../database/client'
+import { EventRepository } from '../../repositories/event-repository'
 import { IController } from '../../@types/controllers'
 import { PostInvoiceController } from '../../controllers/invoices/post-invoice-controller'
 import { slidingWindowRateLimiterFactory } from '../rate-limiter-factory'
 import { UserRepository } from '../../repositories/user-repository'
 
 export const createPostInvoiceController = (): IController => {
   const dbClient = getMasterDbClient()
-  const userRepository = new UserRepository(dbClient)
+  const readReplicaDbClient = getReadReplicaDbClient()
+  const eventRepository = new EventRepository(dbClient, readReplicaDbClient)
+  const userRepository = new UserRepository(dbClient, eventRepository)
   const paymentsService = createPaymentsService()
 
   return new PostInvoiceController(
diff --git a/src/factories/event-strategy-factory.ts b/src/factories/event-strategy-factory.ts
@@ -5,7 +5,7 @@ import { EphemeralEventStrategy } from '../handlers/event-strategies/ephemeral-e
 import { Event } from '../@types/event'
 import { Factory } from '../@types/base'
 import { GiftWrapEventStrategy } from '../handlers/event-strategies/gift-wrap-event-strategy'
-import { IEventRepository } from '../@types/repositories'
+import { IEventRepository, IUserRepository } from '../@types/repositories'
 import { IEventStrategy } from '../@types/message-handlers'
 import { IWebSocketAdapter } from '../@types/adapters'
 import { ParameterizedReplaceableEventStrategy } from '../handlers/event-strategies/parameterized-replaceable-event-strategy'
@@ -14,10 +14,11 @@ import { VanishEventStrategy } from '../handlers/event-strategies/vanish-event-s
 
 export const eventStrategyFactory = (
   eventRepository: IEventRepository,
+  userRepository: IUserRepository,
 ): Factory<IEventStrategy<Event, Promise<void>>, [Event, IWebSocketAdapter]> =>
   ([event, adapter]: [Event, IWebSocketAdapter]) => {
     if (isRequestToVanishEvent(event)) {
-      return new VanishEventStrategy(adapter, eventRepository)
+      return new VanishEventStrategy(adapter, eventRepository, userRepository)
     } else if (isGiftWrapEvent(event)) {
       return new GiftWrapEventStrategy(adapter, eventRepository)
     } else if (isReplaceableEvent(event)) {
diff --git a/src/factories/message-handler-factory.ts b/src/factories/message-handler-factory.ts
@@ -17,7 +17,7 @@ export const messageHandlerFactory = (
       {
         return new EventMessageHandler(
           adapter,
-          eventStrategyFactory(eventRepository),
+          eventStrategyFactory(eventRepository, userRepository),
           eventRepository,
           userRepository,
           createSettings,
diff --git a/src/factories/payments-service-factory.ts b/src/factories/payments-service-factory.ts
@@ -10,9 +10,9 @@ export const createPaymentsService = () => {
   const dbClient = getMasterDbClient()
   const rrDbClient = getReadReplicaDbClient()
   const invoiceRepository = new InvoiceRepository(dbClient)
-  const userRepository = new UserRepository(dbClient)
-  const paymentsProcessor = createPaymentsProcessor()
   const eventRepository = new EventRepository(dbClient, rrDbClient)
+  const userRepository = new UserRepository(dbClient, eventRepository)
+  const paymentsProcessor = createPaymentsProcessor()
 
   return new PaymentsService(
     dbClient,
diff --git a/src/factories/static-mirroring.worker-factory.ts b/src/factories/static-mirroring.worker-factory.ts
@@ -8,7 +8,7 @@ export const staticMirroringWorkerFactory = () => {
   const dbClient = getMasterDbClient()
   const readReplicaDbClient = getReadReplicaDbClient()
   const eventRepository = new EventRepository(dbClient, readReplicaDbClient)
-  const userRepository = new UserRepository(dbClient)
+  const userRepository = new UserRepository(dbClient, eventRepository)
 
   return new StaticMirroringWorker(
     eventRepository,
diff --git a/src/factories/worker-factory.ts b/src/factories/worker-factory.ts
@@ -16,7 +16,7 @@ export const workerFactory = (): AppWorker => {
   const dbClient = getMasterDbClient()
   const readReplicaDbClient = getReadReplicaDbClient()
   const eventRepository = new EventRepository(dbClient, readReplicaDbClient)
-  const userRepository = new UserRepository(dbClient)
+  const userRepository = new UserRepository(dbClient, eventRepository)
 
   const settings = createSettings()
 
diff --git a/src/handlers/event-message-handler.ts b/src/handlers/event-message-handler.ts
@@ -234,8 +234,8 @@ export class EventMessageHandler implements IMessageHandler {
       return
     }
 
-    const existingVanishRequest = await this.eventRepository.hasActiveRequestToVanish(event.pubkey)
-    if (existingVanishRequest) {
+    const isVanished = await this.userRepository.isVanished(event.pubkey)
+    if (isVanished) {
       return 'blocked: request to vanish active for pubkey'
     }
   }
diff --git a/src/handlers/event-strategies/vanish-event-strategy.ts b/src/handlers/event-strategies/vanish-event-strategy.ts
@@ -1,8 +1,8 @@
+import { IEventRepository, IUserRepository } from '../../@types/repositories'
 import { createCommandResult } from '../../utils/messages'
 import { createLogger } from '../../factories/logger-factory'
 import { Event } from '../../@types/event'
 import { EventKinds } from '../../constants/base'
-import { IEventRepository } from '../../@types/repositories'
 import { IEventStrategy } from '../../@types/message-handlers'
 import { IWebSocketAdapter } from '../../@types/adapters'
 import { WebSocketAdapterEvent } from '../../constants/adapter'
@@ -13,6 +13,7 @@ export class VanishEventStrategy implements IEventStrategy<Event, Promise<void>>
   public constructor(
     private readonly webSocket: IWebSocketAdapter,
     private readonly eventRepository: IEventRepository,
+    private readonly userRepository: IUserRepository,
   ) {}
 
   public async execute(event: Event): Promise<void> {
@@ -25,6 +26,8 @@ export class VanishEventStrategy implements IEventStrategy<Event, Promise<void>>
 
     const count = await this.eventRepository.create(event)
 
+    await this.userRepository.setVanished(event.pubkey, true)
+
     this.webSocket.emit(
       WebSocketAdapterEvent.Message,
       createCommandResult(event.id, true, count ? '' : 'duplicate:')
diff --git a/src/repositories/user-repository.ts b/src/repositories/user-repository.ts
@@ -1,15 +1,18 @@
-import { always, applySpec, omit, pipe, prop } from 'ramda'
-
+import { always, applySpec, defaultTo, omit, pipe, prop } from 'ramda'
 import { DatabaseClient, Pubkey } from '../@types/base'
 import { DBUser, User } from '../@types/user'
 import { fromDBUser, toBuffer } from '../utils/transform'
+import { IEventRepository, IUserRepository } from '../@types/repositories'
 import { createLogger } from '../factories/logger-factory'
-import { IUserRepository } from '../@types/repositories'
+
 
 const debug = createLogger('user-repository')
 
 export class UserRepository implements IUserRepository {
-  public constructor(private readonly dbClient: DatabaseClient) { }
+  public constructor(
+    private readonly dbClient: DatabaseClient,
+    private readonly eventRepository: IEventRepository,
+  ) { }
 
   public async findByPubkey(
     pubkey: Pubkey,
@@ -28,7 +31,7 @@ export class UserRepository implements IUserRepository {
   }
 
   public async upsert(
-    user: User,
+    user: Partial<User>,
     client: DatabaseClient = this.dbClient,
   ): Promise<number> {
     debug('upsert: %o', user)
@@ -37,7 +40,8 @@ export class UserRepository implements IUserRepository {
 
     const row = applySpec<DBUser>({
       pubkey: pipe(prop('pubkey'), toBuffer),
-      is_admitted: prop('isAdmitted'),
+      is_admitted: pipe(prop('isAdmitted'), defaultTo(false)),
+      is_vanished: pipe(prop('isVanished'), defaultTo(false)),
       tos_accepted_at: prop('tosAcceptedAt'),
       updated_at: always(date),
       created_at: always(date),
@@ -61,6 +65,62 @@ export class UserRepository implements IUserRepository {
     } as Promise<number>
   }
 
+  /**
+   * Returns vanish state from users.is_vanished, or lazily hydrates a user row from events once
+   * when no users row exists (single upsert; no duplicate inserts).
+   */
+  public async isVanished(
+    pubkey: Pubkey,
+    client: DatabaseClient = this.dbClient
+  ): Promise<boolean> {
+    const existing = await this.findByPubkey(pubkey, client)
+    if (existing) {
+      return existing.isVanished
+    }
+
+    const vanishedFromEvents = await this.eventRepository.hasActiveRequestToVanish(pubkey)
+    await this.upsertVanishState(pubkey, vanishedFromEvents, client)
+    return vanishedFromEvents
+  }
+
+  public setVanished(
+    pubkey: Pubkey,
+    vanished: boolean,
+    client: DatabaseClient = this.dbClient
+  ): Promise<number> {
+    return this.upsertVanishState(pubkey, vanished, client)
+  }
+
+  private upsertVanishState(
+    pubkey: Pubkey,
+    isVanished: boolean,
+    client: DatabaseClient,
+  ): Promise<number> {
+    debug('upsert vanish state for %s: %o', pubkey, isVanished)
+    const date = new Date()
+
+    const query = client<DBUser>('users')
+      .insert({
+        pubkey: toBuffer(pubkey),
+        is_admitted: false,
+        balance: 0n,
+        is_vanished: isVanished,
+        created_at: date,
+        updated_at: date,
+      })
+      .onConflict('pubkey')
+      .merge({
+        is_vanished: isVanished,
+        updated_at: date,
+      })
+
+    return {
+      then: <T1, T2>(onfulfilled: (value: number) => T1 | PromiseLike<T1>, onrejected: (reason: any) => T2 | PromiseLike<T2>) => query.then(prop('rowCount') as () => number).then(onfulfilled, onrejected),
+      catch: <T>(onrejected: (reason: any) => T | PromiseLike<T>) => query.catch(onrejected),
+      toString: (): string => query.toString(),
+    } as Promise<number>
+  }
+
   public async getBalanceByPubkey(
     pubkey: Pubkey,
     client: DatabaseClient = this.dbClient
diff --git a/src/utils/transform.ts b/src/utils/transform.ts
@@ -39,6 +39,7 @@ export const fromDBInvoice = applySpec<Invoice>({
 export const fromDBUser = applySpec<User>({
   pubkey: pipe(prop('pubkey') as () => Buffer, fromBuffer),
   isAdmitted: prop('is_admitted'),
+  isVanished: prop('is_vanished'),
   balance: prop('balance'),
   createdAt: prop('created_at'),
   updatedAt: prop('updated_at'),
diff --git a/test/unit/factories/event-strategy-factory.spec.ts b/test/unit/factories/event-strategy-factory.spec.ts
@@ -1,5 +1,6 @@
 import { expect } from 'chai'
 
+import { IEventRepository, IUserRepository } from '../../../src/@types/repositories'
 import { DefaultEventStrategy } from '../../../src/handlers/event-strategies/default-event-strategy'
 import { DeleteEventStrategy } from '../../../src/handlers/event-strategies/delete-event-strategy'
 import { EphemeralEventStrategy } from '../../../src/handlers/event-strategies/ephemeral-event-strategy'
@@ -8,7 +9,6 @@ import { EventKinds } from '../../../src/constants/base'
 import { eventStrategyFactory } from '../../../src/factories/event-strategy-factory'
 import { Factory } from '../../../src/@types/base'
 import { GiftWrapEventStrategy } from '../../../src/handlers/event-strategies/gift-wrap-event-strategy'
-import { IEventRepository } from '../../../src/@types/repositories'
 import { IEventStrategy } from '../../../src/@types/message-handlers'
 import { IWebSocketAdapter } from '../../../src/@types/adapters'
 import { ParameterizedReplaceableEventStrategy } from '../../../src/handlers/event-strategies/parameterized-replaceable-event-strategy'
@@ -17,16 +17,18 @@ import { VanishEventStrategy } from '../../../src/handlers/event-strategies/vani
 
 describe('eventStrategyFactory', () => {
   let eventRepository: IEventRepository
+  let userRepository: IUserRepository
   let event: Event
   let adapter: IWebSocketAdapter
   let factory: Factory<IEventStrategy<Event, Promise<void>>, [Event, IWebSocketAdapter]>
 
   beforeEach(() => {
     eventRepository = {} as any
+    userRepository = {} as any
     event = {} as any
     adapter = {} as any
 
-    factory = eventStrategyFactory(eventRepository)
+    factory = eventStrategyFactory(eventRepository, userRepository)
   })
 
   it('returns ReplaceableEvent given a set_metadata event', () => {
diff --git a/test/unit/handlers/event-message-handler.spec.ts b/test/unit/handlers/event-message-handler.spec.ts
diff --git a/test/unit/handlers/event-strategies/vanish-event-strategy.spec.ts b/test/unit/handlers/event-strategies/vanish-event-strategy.spec.ts

Original file line number	Diff line number	Diff line change
`@@ -62,4 +62,6 @@ export interface IUserRepository {`
`62`	`62`	`findByPubkey(pubkey: Pubkey, client?: DatabaseClient): Promise<User \| undefined>`
`63`	`63`	`upsert(user: Partial<User>, client?: DatabaseClient): Promise<number>`
`64`	`64`	`getBalanceByPubkey(pubkey: Pubkey, client?: DatabaseClient): Promise<bigint>`
	`65`	`+ isVanished(pubkey: Pubkey, client?: DatabaseClient): Promise<boolean>`
	`66`	`+ setVanished(pubkey: Pubkey, vanished: boolean, client?: DatabaseClient): Promise<number>`
`65`	`67`	`}`
Original file line number	Diff line number	Diff line change
`@@ -17,7 +17,7 @@ export const messageHandlerFactory = (`
`17`	`17`	`{`
`18`	`18`	`return new EventMessageHandler(`
`19`	`19`	`adapter,`
`20`		`- eventStrategyFactory(eventRepository),`
	`20`	`+ eventStrategyFactory(eventRepository, userRepository),`
`21`	`21`	`eventRepository,`
`22`	`22`	`userRepository,`
`23`	`23`	`createSettings,`