fix(core): handle MTPROTO_CLUSTER_INVALID

packages/core/scripts/generate-client.cjs

@@ -733,6 +733,7 @@ withParams(params: RpcCallOptions): this\n`)
         'computeNewPasswordHash',
         'changePrimaryDc',
         'getMtprotoMessageId',
+        'recreateDc',
     ].forEach((name) => {
         output.write(
             `TelegramClient.prototype.${name} = function(...args) {\n`

packages/core/src/highlevel/base.ts

@@ -346,4 +346,9 @@ export class BaseTelegramClient implements ITelegramClient {
     async getMtprotoMessageId(): Promise<Long> {
         return this.mt.network.getMtprotoMessageId()
     }
+
+    async recreateDc(dcId: number): Promise<void> {
+        await this.mt.network.config.update(true)
+        await this.mt.network.recreateDc(dcId)
+    }
 }

packages/core/src/highlevel/client.ts

@@ -3445,8 +3445,6 @@ export interface TelegramClient extends ITelegramClient {
             /**
              * Maximum message ID to return.
              *
-             * Unless {@link addOffset} is used, this will work the same as {@link offset}.
-             *
              * @default  `0` (disabled).
              */
             maxId?: number
@@ -6946,3 +6944,6 @@ TelegramClient.prototype.changePrimaryDc = function (...args) {
 TelegramClient.prototype.getMtprotoMessageId = function (...args) {
     return this._client.getMtprotoMessageId(...args)
 }
+TelegramClient.prototype.recreateDc = function (...args) {
+    return this._client.recreateDc(...args)
+}

packages/core/src/highlevel/client.types.ts

@@ -72,4 +72,6 @@ export interface ITelegramClient {
     computeSrpParams(request: tl.account.RawPassword, password: string): Promise<tl.RawInputCheckPasswordSRP>
     computeNewPasswordHash(algo: tl.TypePasswordKdfAlgo, password: string): Promise<Uint8Array>
     getMtprotoMessageId(): Promise<Long>
+
+    recreateDc(dcId: number): Promise<void>
 }

packages/core/src/highlevel/methods/files/download-iterable.ts

@@ -145,6 +145,12 @@ export async function* downloadAsIterable(
                 // todo: implement someday
                 // see: https://github.com/LonamiWebs/Telethon/blob/0e8bd8248cc649637b7c392616887c50986427a0/telethon/client/downloads.py#L99
                 throw new MtUnsupportedError('File ref expired!')
+            } else if (e.is('MTPROTO_CLUSTER_INVALID') && dcId != null) {
+                // this is a weird error that happens when we are trying to download a file from a "wrong" media dc
+                // (e.g. this happens when we load media dc ip from session, but the current media dc ip is different)
+                client.log.debug('received cluster invalid error for dc %d, recreating dc', dcId)
+                await client.recreateDc(dcId)
+                return downloadChunk(chunk)
             } else {
                 throw e
             }

packages/core/src/highlevel/worker/port.ts

@@ -56,6 +56,7 @@ export abstract class TelegramWorkerPort<Custom extends WorkerCustomMethods> imp
     readonly startUpdatesLoop: ITelegramClient['startUpdatesLoop']
     readonly stopUpdatesLoop: ITelegramClient['stopUpdatesLoop']
     readonly getMtprotoMessageId: ITelegramClient['getMtprotoMessageId']
+    readonly recreateDc: ITelegramClient['recreateDc']
 
     private _abortController = new AbortController()
     readonly stopSignal: AbortSignal = this._abortController.signal
@@ -92,6 +93,7 @@ export abstract class TelegramWorkerPort<Custom extends WorkerCustomMethods> imp
         this.startUpdatesLoop = bind('startUpdatesLoop')
         this.stopUpdatesLoop = bind('stopUpdatesLoop')
         this.getMtprotoMessageId = bind('getMtprotoMessageId')
+        this.recreateDc = bind('recreateDc')
 
         this.timers = new TimersManager()
         this.timers.onError(err => this.onError.emit(unknownToError(err)))

packages/core/src/network/network-manager.ts

@@ -487,6 +487,7 @@ export class NetworkManager {
 
     protected readonly _dcConnections: Map<number, DcConnectionManager> = new Map()
     protected _primaryDc?: DcConnectionManager
+    protected _primaryDcRecreationPromise?: Deferred<void>
 
     private _updateHandler: (upd: tl.TypeUpdates, fromClient: boolean) => void
 
@@ -804,7 +805,11 @@ export class NetworkManager {
         params?: RpcCallOptions,
     ): Promise<tl.RpcCallReturn[T['_']] | mtp.RawMt_rpc_error> => {
         if (!this._primaryDc) {
-            throw new MtcuteError('Not connected to any DC')
+            if (this._primaryDcRecreationPromise) {
+                await this._primaryDcRecreationPromise.promise
+            } else {
+                throw new MtcuteError('Not connected to any DC')
+            }
         }
 
         const kind = params?.kind ?? 'main'
@@ -812,10 +817,10 @@ export class NetworkManager {
 
         if (params?.manager) {
             manager = params.manager
-        } else if (params?.dcId && params.dcId !== this._primaryDc.dcId) {
+        } else if (params?.dcId && params.dcId !== this._primaryDc!.dcId) {
             manager = await this._getOtherDc(params.dcId)
         } else {
-            manager = this._primaryDc
+            manager = this._primaryDc!
         }
 
         let multi = manager[kind]
@@ -912,4 +917,46 @@ export class NetworkManager {
     getMtprotoMessageId(): Long {
         return this._primaryDc!.main._sessions[0].getMessageId()
     }
+
+    async recreateDc(dcId: number): Promise<void> {
+        this._log.debug('recreating dc %d', dcId)
+        const existing = this._dcConnections.get(dcId)
+        if (existing) {
+            await existing.destroy()
+        }
+
+        this._dcConnections.delete(dcId)
+
+        if (dcId === this._primaryDc?.dcId) {
+            const oldPrimaryDc = this._primaryDc
+            this._primaryDc = undefined
+            this._primaryDcRecreationPromise = new Deferred()
+
+            try {
+                const newDefaultDcs: DcOptions = {
+                    main: asNonNull(await this.config.findOption({
+                        dcId,
+                        allowIpv6: this.params.useIpv6,
+                    })),
+                    media: asNonNull(await this.config.findOption({
+                        dcId,
+                        allowIpv6: this.params.useIpv6,
+                        allowMedia: true,
+                        preferMedia: true,
+                    })),
+                }
+
+                await this._storage.dcs.store(newDefaultDcs)
+                await this.connect(newDefaultDcs)
+                this._primaryDcRecreationPromise.resolve()
+                this._primaryDcRecreationPromise = undefined
+            } catch (e) {
+                // restore old primary dc to avoid a deadlock
+                this._primaryDc = oldPrimaryDc
+                this._primaryDcRecreationPromise?.resolve()
+                this._primaryDcRecreationPromise = undefined
+                throw e
+            }
+        }
+    }
 }