Multiple bots

In some cases, you may need to run multiple bots at the same time. This can also be achieved with this module. To work with multiple bots, first create the bots. In this case, bot naming becomes mandatory.

import { Module } from '@nestjs/common';
import { ConfigModule } from '@nestjs/config';
import { TelegrafModule } from 'nestjs-telegraf';

@Module({
  imports: [
    ConfigModule.forRoot(),
    TelegrafModule.forRootAsync({
      imports: [ConfigModule],
      botName: 'cat',  
      useFactory: (configService: ConfigService) => ({
        token: configService.get<string>('CAT_BOT_TOKEN'),
      }),
      inject: [ConfigService],
    }),
    TelegrafModule.forRootAsync({
      imports: [ConfigModule.forFeature(telegrafModuleConfig)],
      botName: 'dog',  
      useFactory: async (configService: ConfigService) => ({
        token: configService.get<string>('DOG_BOT_TOKEN'),
      }),
      inject: [ConfigService],
    }),
  ],
})
export class AppModule {}

:::caution Please note that you shouldn't have multiple bots without a name, or with the same name, otherwise they will get overridden. :::

You can also inject the Bot for a given bot:

import { Injectable } from '@nestjs/common';
import { InjectBot, Telegraf, Context } from 'nestjs-telegraf';

@Injectable()
export class EchoService {
  constructor(@InjectBot('cat') private catBot: Telegraf<Context>) {}
}

To inject a given Bot to a custom provider (for example, factory provider), use the getBotToken() function passing the name of the bot as an argument.

{
  provide: CatsService,
  useFactory: (catBot: Telegraf<Context>) => {
    return new CatsService(catBot);
  },
  inject: [getBotToken('cat')],
}

Another useful feature of the nestjs-telegraf module is the ability to choose which modules should handle updates for each launched bot. By default, module searches for handlers throughout the whole app. To limit this scan to only a subset of modules, use the include property.

TelegrafModule.forRootAsync({
  imports: [ConfigModule],
  botName: 'cat',  
  useFactory: (configService: ConfigService) => ({
    token: configService.get<string>('CAT_BOT_TOKEN'),
    include: [CatsModule],  
  }),
  inject: [ConfigService],
}),