fix: various fixes, improved updates handing

packages/client/src/client.ts

@@ -149,6 +149,7 @@ import {
     _dispatchUpdate,
     _fetchUpdatesState,
     _handleUpdate,
+    _keepAliveAction,
     _loadStorage,
     _saveStorage,
     catchUp,
@@ -172,6 +173,7 @@ import { Readable } from 'stream'
 import {
     ArrayWithTotal,
     BotCommands,
+    BotStoppedUpdate,
     CallbackQuery,
     Chat,
     ChatEvent,
@@ -339,6 +341,13 @@ export interface TelegramClient extends BaseTelegramClient {
      * @param handler  History read handler
      */
     on(name: 'history_read', handler: (upd: HistoryReadUpdate) => void): this
+    /**
+     * Register a bot stopped handler
+     *
+     * @param name  Event name
+     * @param handler  Bot stopped handler
+     */
+    on(name: 'bot_stopped', handler: (upd: BotStoppedUpdate) => void): this
     /**
      * Accept the given TOS
      *
@@ -3660,6 +3669,7 @@ export class TelegramClient extends BaseTelegramClient {
     protected _dispatchUpdate = _dispatchUpdate
     _handleUpdate = _handleUpdate
     catchUp = catchUp
+    protected _keepAliveAction = _keepAliveAction
     blockUser = blockUser
     deleteProfilePhotos = deleteProfilePhotos
     getCommonChats = getCommonChats

packages/client/src/methods/_imports.ts

@@ -52,7 +52,8 @@ import {
     PollVoteUpdate,
     UserStatusUpdate,
     UserTypingUpdate,
-    Conversation
+    Conversation,
+    BotStoppedUpdate
 } from '../types'
 
 // @copy

packages/client/src/methods/updates.ts

@@ -10,7 +10,7 @@ import {
     getBarePeerId,
     getMarkedPeerId,
     markedPeerIdToBare,
-    MAX_CHANNEL_ID,
+    MAX_CHANNEL_ID, RpcError,
 } from '@mtqt/core'
 import { isDummyUpdate, isDummyUpdates } from '../utils/updates-utils'
 import { ChatsIndex, UsersIndex } from '../types'
@@ -1002,3 +1002,9 @@ export function catchUp(this: TelegramClient): Promise<void> {
         .then(() => this._updLock.release())
         .then(() => this._saveStorage())
 }
+
+/** @internal */
+export function _keepAliveAction(this: TelegramClient): void {
+    debug('no updates for >15 minutes, catching up')
+    this.catchUp().catch((err) => this._emitError(err))
+}

packages/core/src/base-client.ts

@@ -236,7 +236,7 @@ export class BaseTelegramClient extends EventEmitter {
     readonly _layer: number
 
     private _keepAliveInterval?: NodeJS.Timeout
-    private _lastRequestTime = 0
+    protected _lastUpdateTime = 0
     private _floodWaitedRequests: Record<string, number> = {}
 
     protected _config?: tl.RawConfig
@@ -332,6 +332,19 @@ export class BaseTelegramClient extends EventEmitter {
         await this.storage.save?.()
     }
 
+    protected _keepAliveAction(): void {
+        // telegram asks to fetch pending updates
+        // if there are no updates for 15 minutes.
+        // core does not have update handling,
+        // so we just use getState so the server knows
+        // we still do need updates
+        this.call({ _: 'updates.getState' }).catch((e) => {
+            if (!(e instanceof RpcError)) {
+                this.primaryConnection.reconnect()
+            }
+        })
+    }
+
     private _cleanupPrimaryConnection(forever = false): void {
         if (forever && this.primaryConnection) this.primaryConnection.destroy()
         if (this._keepAliveInterval) clearInterval(this._keepAliveInterval)
@@ -349,25 +362,19 @@ export class BaseTelegramClient extends EventEmitter {
             reconnectionStrategy: this._reconnectionStrategy,
             layer: this._layer,
         })
-        this.primaryConnection.on('usable', async () => {
+        this.primaryConnection.on('usable', async (isReconnection: boolean) => {
+            this._lastUpdateTime = Date.now()
+
             this._keepAliveInterval = setInterval(async () => {
-                // according to telethon, "We need to send some content-related request at least hourly
+                if (Date.now() - this._lastUpdateTime > 900_000) {
-                // for Telegram to keep delivering updates, otherwise they will just stop even if we're connected.
+                    this._keepAliveAction()
-                // Do so every 30 minutes"
+                    this._lastUpdateTime = Date.now()
-                if (Date.now() - this._lastRequestTime > 1800_000) {
-                    try {
-                        await this.call({ _: 'updates.getState' })
-                    } catch (e) {
-                        if (!(e instanceof RpcError)) {
-                            this.primaryConnection.reconnect()
-                        }
-                    }
                 }
             }, 60_000)
 
             // on reconnection we need to call updates.getState so Telegram
             // knows we still want the updates
-            if (!this._disableUpdates) {
+            if (isReconnection && !this._disableUpdates) {
                 setTimeout(async () => {
                     try {
                         await this.call({ _: 'updates.getState' })
@@ -380,6 +387,7 @@ export class BaseTelegramClient extends EventEmitter {
             }
         })
         this.primaryConnection.on('update', (update) => {
+            this._lastUpdateTime = Date.now()
             this._handleUpdate(update)
         })
         this.primaryConnection.on('wait', () =>
@@ -568,8 +576,6 @@ export class BaseTelegramClient extends EventEmitter {
             } as any // who cares
         }
 
-        this._lastRequestTime = Date.now()
-
         const connection = params?.connection ?? this.primaryConnection
 
         let lastError: Error | null = null

packages/core/src/network/persistent-connection.ts

@@ -82,12 +82,14 @@ export abstract class PersistentConnection extends EventEmitter {
     }
 
     protected onConnectionUsable(): void {
+        const isReconnection = this._consequentFails > 0
+
         // reset reconnection related state
         this._lastError = null
         this._consequentFails = 0
         this._previousWait = null
         this._usable = true
-        this.emit('usable')
+        this.emit('usable', isReconnection)
         this._rescheduleInactivity()
     }
 

packages/core/src/network/telegram-connection.ts

@@ -149,6 +149,7 @@ export class TelegramConnection extends PersistentConnection {
                 it.promise.reject(new Error('Connection destroyed'))
             )
             this._mtproto.reset()
+            this.removeAllListeners()
         }
     }