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ILshat Khamitov
ILshat Khamitov

Posted on

Add a module for process unhandled message in NestJS Telegram bot with Google Dialogflow API

#kaufmanbot #nestjs #telegram #dialogflow

Links

https://github.com/EndyKaufman/kaufman-bot - source code of bot

https://telegram.me/DevelopKaufmanBot - current bot in telegram

https://cloud.google.com/dialogflow/docs/support/getting-support - official docs

https://github.com/googleapis/nodejs-dialogflow - node library for work with dialogflow

Install dependecies

npm i --save @google-cloud/dialogflow uuid

endy@endy-virtual-machine:~/Projects/current/kaufman-bot$ npm i --save-dev @google-cloud/dialogflow uuid

added 42 packages, and audited 984 packages in 8s

115 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities
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npm i --save-dev @types/uuid

endy@endy-virtual-machine:~/Projects/current/kaufman-bot$ npm i --save-dev @types/uuid

added 1 package, and audited 985 packages in 2s

115 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities
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Setup dialogflow

Create project

Navigate to https://dialogflow.cloud.google.com/

Create new agent
Create new agent
Create new agent 2

After create you see two default intents
After create you see two default intents

Test welcome intent from UI
Test welcome intent from ui

Response for answer was selected from default responses
Response for answer was selected from default responses

Settings of authorizations

Navigate to project list
https://console.cloud.google.com/projectselector/iam-admin/serviceaccounts/create?supportedpurview=project

Select your project
Select your project

In the Service account description field, enter a description. For example, Service account for quickstart.
In the Service account description field

Select role with Dialogflow and click continue
Select role with Dialogflow

Click done
Click done

After click done you see list of accounts
After click done you see list of accounts

Click Keys
Click Keys

Click Add key, then click Create new key
Click Add key, then click Create new key

Click Create
Click Create

A JSON key file is downloaded to your computer, click Close
A JSON key file is downloaded to your computer, click Close

Copy downloaded file to root folder of application and add it file name to .gitignore
Copy downloaded file to root folder of application and add it file name to .gitignore

Update core source for correct work dialogflow logic

Update OnAfterBotCommands

libs/core/server/src/lib/bot-commands/bot-commands-types/on-after-bot-commands.interface.ts

import { BotCommandsProviderActionResultType } from './bot-commands-provider-action-result-type';
import { BotCommandsProviderActionMsg } from './bot-commands-provider.interface';

export interface OnAfterBotCommands {
  onAfterBotCommands<
    TMsg extends BotCommandsProviderActionMsg = BotCommandsProviderActionMsg
  >(
    result: BotCommandsProviderActionResultType<TMsg>,
    msg: TMsg,
    ctx?,
    defaultHandler?: () => Promise<unknown>
  ): Promise<{ result: BotCommandsProviderActionResultType<TMsg>; msg: TMsg }>;
}
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Update BotСommandsService

libs/core/server/src/lib/bot-commands/bot-commands-services/bot-commands.service.ts

import { Injectable } from '@nestjs/common';
import { CustomInject } from 'nestjs-custom-injector';
import { BotCommandsEnum } from '../bot-commands-types/bot-commands-enum';
import { BotCommandsProviderActionResultType } from '../bot-commands-types/bot-commands-provider-action-result-type';
import {
  BotCommandsProvider,
  BotCommandsProviderActionContext,
  BotCommandsProviderActionMsg,
  BOT_COMMANDS_PROVIDER,
} from '../bot-commands-types/bot-commands-provider.interface';
import { OnAfterBotCommands } from '../bot-commands-types/on-after-bot-commands.interface';
import { OnBeforeBotCommands } from '../bot-commands-types/on-before-bot-commands.interface';
import { BotСommandsToolsService } from './bot-commands-tools.service';
@Injectable()
export class BotСommandsService implements BotCommandsProvider {
  @CustomInject(BOT_COMMANDS_PROVIDER, { multi: true })
  private botCommandsProviders!: (BotCommandsProvider &
    Partial<OnBeforeBotCommands> &
    Partial<OnAfterBotCommands>)[];

  constructor(
    private readonly botСommandsToolsService: BotСommandsToolsService
  ) {}

  async process(ctx, defaultHandler?: () => Promise<unknown>) {
    let msg: BotCommandsProviderActionMsg = ctx.update.message;
    const result = await this.onMessage(msg, ctx, defaultHandler);
    if (result?.type === 'message') {
      msg = result.message;
    }
    if (result?.type === 'markdown') {
      await ctx.reply(result.markdown, { parse_mode: 'MarkdownV2' });
      return;
    }
    if (result?.type === 'text') {
      await ctx.reply(result.text);
      return;
    }
  }

  async onHelp<TMsg extends BotCommandsProviderActionMsg>(
    msg: TMsg,
    ctx: BotCommandsProviderActionContext
  ): Promise<BotCommandsProviderActionResultType<TMsg>> {
    const allResults: string[] = [];
    const len = this.botCommandsProviders.length;
    for (let i = 0; i < len; i++) {
      const botCommandsProvider = this.botCommandsProviders[i];

      const result = await botCommandsProvider.onHelp(msg, ctx);

      if (result !== null && result.type === 'text') {
        allResults.push(result.text);
      }

      if (result !== null && result.type === 'markdown') {
        allResults.push(result.markdown);
      }
    }
    return {
      type: 'markdown',
      markdown: allResults.join('\n\n'),
    };
  }

  async onMessage<TMsg extends BotCommandsProviderActionMsg>(
    msg: TMsg,
    ctx: BotCommandsProviderActionContext,
    defaultHandler?: () => Promise<unknown>
  ): Promise<BotCommandsProviderActionResultType<TMsg>> {
    msg = await this.processOnBeforeBotCommands(msg, ctx);

    const len = this.botCommandsProviders.length;
    let result: BotCommandsProviderActionResultType<TMsg> = null;
    for (let i = 0; i < len; i++) {
      if (!result) {
        const botCommandsProvider = this.botCommandsProviders[i];

        result = await botCommandsProvider.onMessage(msg, ctx);
      }
    }

    if (
      result === null &&
      this.botСommandsToolsService.checkCommands(
        msg.text,
        [BotCommandsEnum.help],
        msg.from.language_code
      )
    ) {
      return this.onHelp(msg, ctx);
    }

    const afterBotCommand = await this.processOnAfterBotCommands(
      result,
      msg,
      ctx,
      defaultHandler
    );

    if (defaultHandler) {
      await defaultHandler();
    }

    return afterBotCommand.result;
  }

  async processOnBeforeBotCommands<TMsg extends BotCommandsProviderActionMsg>(
    msg: TMsg,
    ctx?: BotCommandsProviderActionContext
  ): Promise<TMsg> {
    const len = this.botCommandsProviders.length;
    for (let i = 0; i < len; i++) {
      const botCommandsProvider = this.botCommandsProviders[i];
      if (botCommandsProvider.onBeforeBotCommands)
        msg = await botCommandsProvider.onBeforeBotCommands(msg, ctx);
    }
    return msg;
  }

  async processOnAfterBotCommands<TMsg extends BotCommandsProviderActionMsg>(
    result: BotCommandsProviderActionResultType<TMsg>,
    msg: TMsg,
    ctx?: BotCommandsProviderActionContext,
    defaultHandler?: () => Promise<unknown>
  ): Promise<{ result: BotCommandsProviderActionResultType<TMsg>; msg: TMsg }> {
    const len = this.botCommandsProviders.length;
    for (let i = 0; i < len; i++) {
      const botCommandsProvider = this.botCommandsProviders[i];
      if (botCommandsProvider.onAfterBotCommands) {
        const afterBotCommand =
          await botCommandsProvider.onAfterBotCommands<TMsg>(
            result,
            msg,
            ctx,
            defaultHandler
          );
        result = afterBotCommand.result;
        msg = afterBotCommand.msg;
      }
    }
    return { result, msg };
  }
}
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Update debug-messages modules files for reuse it in other libs

Create DebugService

libs/debug-messages/server/src/lib/debug-messages-services/debug.service.ts

import { BotCommandsProviderActionMsg } from '@kaufman-bot/core/server';
import { Injectable, Logger } from '@nestjs/common';

const DEBUG_MODE = 'debugMode';

@Injectable()
export class DebugService {
  private readonly logger = new Logger(DebugService.name);

  setDebugMode<
    TMsg extends BotCommandsProviderActionMsg = BotCommandsProviderActionMsg
  >(msg: TMsg, value: boolean) {
    if (!msg.botContext) {
      msg.botContext = {};
    }
    msg.botContext[DEBUG_MODE] = value;
    return msg;
  }

  sendDebugInfo<
    TMsg extends BotCommandsProviderActionMsg = BotCommandsProviderActionMsg
  >(
    msg: TMsg,
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    ctx: any,
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    data: any,
    context: string
  ) {
    if (msg.botContext?.[DEBUG_MODE]) {
      ctx.reply(
        [
          `*${context} \\(${+new Date()}\\):*`,
          '```

',
          JSON.stringify(data, undefined, 4),
          '

```',
        ].join('\n'),
        {
          parse_mode: 'MarkdownV2',
        }
      );
    }
    this.logger.debug(data, context);
  }
}
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Update DebugMessagesService

libs/debug-messages/server/src/lib/debug-messages-services/debug-messages.service.ts

import {
  BotCommandsEnum,
  BotCommandsProvider,
  BotCommandsProviderActionMsg,
  BotCommandsProviderActionResultType,
  BotСommandsToolsService,
  OnAfterBotCommands,
  OnBeforeBotCommands,
} from '@kaufman-bot/core/server';
import { Inject, Injectable, Logger } from '@nestjs/common';
import { getText } from 'class-validator-multi-lang';
import { TranslatesService } from 'nestjs-translates';
import {
  DebugMessagesConfig,
  DEBUG_MESSAGES_CONFIG,
} from '../debug-messages-config/debug-messages.config';
import { DebugMessagesCommandsEnum } from '../debug-messages-types/debug-messages-commands';
import { DebugMessagesStorage } from './debug-messages.storage';
import { DebugService } from './debug.service';

@Injectable()
export class DebugMessagesService
  implements BotCommandsProvider, OnBeforeBotCommands, OnAfterBotCommands
{
  private readonly logger = new Logger(DebugMessagesService.name);

  constructor(
    @Inject(DEBUG_MESSAGES_CONFIG)
    private readonly debugMessagesConfig: DebugMessagesConfig,
    private readonly translatesService: TranslatesService,
    private readonly debugMessagesStorage: DebugMessagesStorage,
    private readonly commandToolsService: BotСommandsToolsService,
    private readonly debugService: DebugService
  ) {}

  async onAfterBotCommands<
    TMsg extends BotCommandsProviderActionMsg = BotCommandsProviderActionMsg
  >(
    result: BotCommandsProviderActionResultType<TMsg>,
    msg: TMsg,
    ctx
  ): Promise<{ result: BotCommandsProviderActionResultType<TMsg>; msg: TMsg }> {
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    const { botContext, ...debugData } = msg;
    this.debugService.sendDebugInfo(
      msg,
      ctx,
      debugData,
      this.debugMessagesConfig.name
    );
    return {
      msg,
      result,
    };
  }

  async onBeforeBotCommands<
    TMsg extends BotCommandsProviderActionMsg = BotCommandsProviderActionMsg
  >(msg: TMsg): Promise<TMsg> {
    const debugMode = await this.debugMessagesStorage.getDebugModeOfUser(
      msg.from?.id
    );
    return this.debugService.setDebugMode(msg, debugMode);
  }

  async onHelp<
    TMsg extends BotCommandsProviderActionMsg = BotCommandsProviderActionMsg
  >(msg: TMsg): Promise<BotCommandsProviderActionResultType<TMsg>> {
    return await this.onMessage({
      ...msg,
      text: `${this.debugMessagesConfig.name} ${BotCommandsEnum.help}`,
    });
  }

  async onMessage<
    TMsg extends BotCommandsProviderActionMsg = BotCommandsProviderActionMsg
  >(msg: TMsg): Promise<BotCommandsProviderActionResultType<TMsg>> {
    const locale = msg.from?.language_code || 'en';

    const spyWord = this.debugMessagesConfig.spyWords.find((spyWord) =>
      this.commandToolsService.checkCommands(msg.text, [spyWord], locale)
    );
    if (spyWord) {
      if (
        this.commandToolsService.checkCommands(
          msg.text,
          [BotCommandsEnum.help],
          locale
        )
      ) {
        return {
          type: 'markdown',
          markdown: this.commandToolsService.generateHelpMessage(
            locale,
            this.debugMessagesConfig.name,
            this.debugMessagesConfig.descriptions,
            this.debugMessagesConfig.usage
          ),
        };
      }

      const processedMsg = await this.process(msg, locale);

      if (typeof processedMsg === 'string') {
        return {
          type: 'text',
          text: processedMsg,
        };
      }
      if (processedMsg) {
        return { type: 'message', message: processedMsg };
      }

      this.logger.warn(`Unhandled commands for text: "${msg.text}"`);
      this.logger.debug(msg);
    }
    return null;
  }

  private async process<
    TMsg extends BotCommandsProviderActionMsg = BotCommandsProviderActionMsg
  >(msg: TMsg, locale: string) {
    const debugMode = await this.debugMessagesStorage.getDebugModeOfUser(
      msg.from?.id
    );
    if (
      this.commandToolsService.checkCommands(
        msg.text,
        [DebugMessagesCommandsEnum.on],
        locale
      )
    ) {
      if (!debugMode) {
        await this.debugMessagesStorage.setDebugModeOfUser(msg.from?.id, true);
        return this.translatesService.translate(
          getText(`debug enabled`),
          locale,
          {
            locale,
          }
        );
      } else {
        return this.translatesService.translate(
          getText(`debug already enabled`),
          locale,
          {
            locale,
          }
        );
      }
    }
    if (
      this.commandToolsService.checkCommands(
        msg.text,
        [DebugMessagesCommandsEnum.off],
        locale
      )
    ) {
      if (debugMode) {
        await this.debugMessagesStorage.setDebugModeOfUser(msg.from?.id, false);
        return this.translatesService.translate(
          getText(`debug disabled`),
          locale,
          {
            locale,
          }
        );
      } else {
        return this.translatesService.translate(
          getText(`debug already disabled`),
          locale,
          {
            locale,
          }
        );
      }
    }
    if (
      this.commandToolsService.checkCommands(
        msg.text,
        [DebugMessagesCommandsEnum.current],
        locale
      )
    ) {
      return this.translatesService.translate(
        getText(`debug: {{debugMode}}`),
        locale,
        { debugMode: debugMode ? getText('enabled') : getText('disabled') }
      );
    }
    return null;
  }
}
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Update DebugMessagesModule

libs/debug-messages/server/src/lib/debug-messages.module.ts

...
import { DebugService } from './debug-messages-services/debug.service';

@Module({
  imports: [TranslatesModule, PrismaClientModule, BotCommandsModule],
  providers: [DebugMessagesStorage, DebugService],
  exports: [
    TranslatesModule,
    PrismaClientModule,
    BotCommandsModule,
    DebugMessagesStorage,
    DebugService,
  ],
})
export class DebugMessagesModule {
...
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Create DialogFlowModule

Create table for store metadata with user activity

Create migration

migrations/V202204030939__CreateDialogflowTable.pgsql

CREATE TABLE IF NOT EXISTS "DialogflowSession" (
    id uuid DEFAULT uuid_generate_v4 () NOT NULL,
    "userId" uuid NOT NULL CONSTRAINT "FK_DIALOGFLOW_SESSION__USER_ID" REFERENCES "User",
    "projectId" varchar(512) NOT NULL,
    "sessionId" uuid NOT NULL,
    "requestsMetadata" jsonb DEFAULT '[]' NOT NULL,
    "responsesMetadata" jsonb DEFAULT '[]' NOT NULL,
    "createdAt" timestamp DEFAULT now() NOT NULL,
    "updatedAt" timestamp DEFAULT now() NOT NULL,
    CONSTRAINT "PK_DIALOGFLOW_SESSION" PRIMARY KEY (id)
);

CREATE UNIQUE INDEX IF NOT EXISTS "UQ_DIALOGFLOW_SESSION" ON "DialogflowSession" ("userId", "projectId", "sessionId");
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Apply migrations

npm run migrate:local

endy@endy-virtual-machine:~/Projects/current/kaufman-bot$ npm run migrate:local

> kaufman-bot@0.0.0 migrate:local
> export $(xargs < ./.env.local) > /dev/null 2>&1 && export DATABASE_URL=$SERVER_POSTGRES_URL && npm run migrate


> kaufman-bot@0.0.0 migrate
> npm run flyway -- migrate


> kaufman-bot@0.0.0 flyway
> flyway -c .flyway.js "migrate"

Flyway Community Edition 6.3.2 by Redgate
Database: jdbc:postgresql://localhost:5432/kaufman_bot_develop (PostgreSQL 13.3)
WARNING: Flyway upgrade recommended: PostgreSQL 13.3 is newer than this version of Flyway and support has not been tested. The latest supported version of PostgreSQL is 12.
Successfully validated 4 migrations (execution time 00:00.020s)
Current version of schema "public": 202203310937
Migrating schema "public" to version 202204030939 - CreateDialogflowTable
Successfully applied 1 migration to schema "public" (execution time 00:00.051s)
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Apply migrations

Pull database to prisma schema and regenerate prisma client

npm run prisma:pull:local

endy@endy-virtual-machine:~/Projects/current/kaufman-bot$ npm run prisma:pull:local

> kaufman-bot@0.0.0 prisma:pull:local
> export $(xargs < ./.env.local) > /dev/null 2>&1 && export DATABASE_URL=$SERVER_POSTGRES_URL && npm run -- prisma db pull && npm run prisma:generate


> kaufman-bot@0.0.0 prisma
> prisma "db" "pull"

Prisma schema loaded from prisma/schema.prisma
Datasource "db": PostgreSQL database "kaufman_bot_develop", schema "public" at "localhost:5432"

Introspecting based on datasource defined in prisma/schema.prisma …

✔ Introspected 3 models and wrote them into prisma/schema.prisma in 212ms

Run prisma generate to generate Prisma Client.


> kaufman-bot@0.0.0 prisma:generate
> npm run -- prisma generate


> kaufman-bot@0.0.0 prisma
> prisma "generate"

Prisma schema loaded from prisma/schema.prisma

✔ Generated Prisma Client (3.11.1 | library) to ./node_modules/@prisma/client in 205ms
You can now start using Prisma Client in your code. Reference: https://pris.ly/d/client

import { PrismaClient } from '@prisma/client'
const prisma = new PrismaClient()
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Pull database to prisma schema and regenerate prisma client

New version of prisma schema
prisma/schema.prisma

generator client {
  provider      = "prisma-client-js"
  binaryTargets = ["native", "linux-musl"]
}

datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

model User {
  id                String              @id(map: "PK_USERS") @default(dbgenerated("uuid_generate_v4()")) @db.Uuid
  telegramId        String              @unique(map: "UQ_USERS__TELEGRAM_ID") @db.VarChar(64)
  langCode          String              @default("en") @db.VarChar(64)
  debugMode         Boolean             @default(false)
  DialogflowSession DialogflowSession[]
}

model migrations {
  installed_rank Int      @id(map: "__migrations_pk")
  version        String?  @db.VarChar(50)
  description    String   @db.VarChar(200)
  type           String   @db.VarChar(20)
  script         String   @db.VarChar(1000)
  checksum       Int?
  installed_by   String   @db.VarChar(100)
  installed_on   DateTime @default(now()) @db.Timestamp(6)
  execution_time Int
  success        Boolean

  @@index([success], map: "__migrations_s_idx")
  @@map("__migrations")
}

model DialogflowSession {
  id                String   @id(map: "PK_DIALOGFLOW_SESSION") @default(dbgenerated("uuid_generate_v4()")) @db.Uuid
  userId            String   @db.Uuid
  projectId         String   @db.VarChar(512)
  sessionId         String   @db.Uuid
  requestsMetadata  Json     @default("[]")
  responsesMetadata Json     @default("[]")
  createdAt         DateTime @default(now()) @db.Timestamp(6)
  updatedAt         DateTime @default(now()) @db.Timestamp(6)
  User              User     @relation(fields: [userId], references: [id], onDelete: NoAction, onUpdate: NoAction, map: "FK_DIALOGFLOW_SESSION__USER_ID")

  @@unique([userId, projectId, sessionId], map: "UQ_DIALOGFLOW_SESSION")
}
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Create nx lib

npm run -- nx g @nrwl/nest:lib dialogflow/server

endy@endy-virtual-machine:~/Projects/current/kaufman-bot$ npm run -- nx g @nrwl/nest:lib dialogflow/server

> kaufman-bot@0.0.0 nx
> nx "g" "@nrwl/nest:lib" "dialogflow/server"

CREATE libs/dialogflow/server/README.md
CREATE libs/dialogflow/server/.babelrc
CREATE libs/dialogflow/server/src/index.ts
CREATE libs/dialogflow/server/tsconfig.json
CREATE libs/dialogflow/server/tsconfig.lib.json
UPDATE tsconfig.base.json
CREATE libs/dialogflow/server/project.json
UPDATE workspace.json
CREATE libs/dialogflow/server/.eslintrc.json
CREATE libs/dialogflow/server/jest.config.js
CREATE libs/dialogflow/server/tsconfig.spec.json
CREATE libs/dialogflow/server/src/lib/dialogflow-server.module.ts
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Create nx lib

Add types

All work with dialogflow store in database, and it clear if user start work with another commands

libs/dialogflow/server/src/lib/dialogflow-types/dialogflow-session-metadata.ts

import { protos } from '@google-cloud/dialogflow';

export type DialogflowSessionRequestsMetadata = {
  ts: number;
  request: protos.google.cloud.dialogflow.v2.IDetectIntentRequest;
}[];

export type DialogflowSessionResponsesMetadata = {
  ts: number;
  response: protos.google.cloud.dialogflow.v2.IDetectIntentResponse;
}[];
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Add config interface

libs/dialogflow/server/src/lib/dialogflow-config/dialogflow.config.ts

export const DIALOGFLOW_CONFIG = 'DIALOGFLOW_CONFIG';

export interface DialogflowConfig {
  name: string;
  descriptions: string;
  usage: string[];
  spyWords: string[];
  projectId: string;
}
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Add storage service

libs/dialogflow/server/src/lib/dialogflow-services/dialogflow.storage.ts

import { PrismaClientService } from '@kaufman-bot/core/server';
import { Injectable } from '@nestjs/common';
import {
  DialogflowSessionRequestsMetadata,
  DialogflowSessionResponsesMetadata,
} from '../dialogflow-types/dialogflow-session-metadata';

export type SessionOfUsers = {
  sessionId: string;
  responsesMetadata: DialogflowSessionResponsesMetadata;
  requestsMetadata: DialogflowSessionRequestsMetadata;
};

@Injectable()
export class DialogflowStorage {
  private readonly sessionOfUsers: Record<number, SessionOfUsers> = {};

  constructor(private readonly prismaClientService: PrismaClientService) {}

  async getUserSession({
    telegramUserId,
    projectId,
  }: {
    telegramUserId: number;
    projectId: string;
  }): Promise<SessionOfUsers | null> {
    const currentSessionOfUsers: SessionOfUsers =
      this.sessionOfUsers[this.getKey({ telegramUserId, projectId })];
    if (currentSessionOfUsers) {
      return currentSessionOfUsers;
    }
    try {
      const currentFromDatabase =
        await this.prismaClientService.dialogflowSession.findFirst({
          where: {
            User: { telegramId: telegramUserId.toString() },
            projectId,
          },
          rejectOnNotFound: true,
        });
      this.sessionOfUsers[this.getKey({ telegramUserId, projectId })] = {
        sessionId: currentFromDatabase.sessionId,
        requestsMetadata: currentFromDatabase.requestsMetadata,
        responsesMetadata: currentFromDatabase.responsesMetadata,
      };
      return this.sessionOfUsers[this.getKey({ telegramUserId, projectId })];
    } catch (error) {
      return null;
    }
  }

  async appendToUserSession({
    telegramUserId,
    projectId,
    sessionOfUsers,
  }: {
    telegramUserId: number;
    projectId: string;
    sessionOfUsers: SessionOfUsers;
  }): Promise<void> {
    const user = await this.getUser(telegramUserId);

    const currentSessionOfUsers: SessionOfUsers =
      this.sessionOfUsers[this.getKey({ telegramUserId, projectId })] || {};
    currentSessionOfUsers.requestsMetadata = [
      ...(currentSessionOfUsers.requestsMetadata || []),
      ...sessionOfUsers.requestsMetadata,
    ];
    currentSessionOfUsers.responsesMetadata = [
      ...(currentSessionOfUsers.responsesMetadata || []),
      ...sessionOfUsers.responsesMetadata,
    ];

    await this.prismaClientService.dialogflowSession.upsert({
      create: {
        userId: user.id,
        projectId,
        sessionId: sessionOfUsers.sessionId,
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        requestsMetadata: currentSessionOfUsers.requestsMetadata as any,
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        responsesMetadata: currentSessionOfUsers.responsesMetadata as any,
      },
      update: {
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        requestsMetadata: currentSessionOfUsers.requestsMetadata as any,
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        responsesMetadata: currentSessionOfUsers.responsesMetadata as any,
      },
      where: {
        userId_projectId_sessionId: {
          projectId,
          userId: user.id,
          sessionId: sessionOfUsers.sessionId,
        },
      },
    });
    this.sessionOfUsers[this.getKey({ telegramUserId, projectId })] = {
      sessionId: sessionOfUsers.sessionId,
      requestsMetadata: currentSessionOfUsers.requestsMetadata,
      responsesMetadata: currentSessionOfUsers.responsesMetadata,
    };
  }

  private async getUser(telegramUserId: number) {
    let user;
    try {
      user = await this.prismaClientService.user.findFirst({
        select: { id: true },
        where: { telegramId: telegramUserId.toString() },
        rejectOnNotFound: true,
      });
    } catch (error) {
      user = await this.prismaClientService.user.create({
        data: { telegramId: telegramUserId.toString() },
      });
    }
    return user;
  }

  async setUserSession({
    telegramUserId,
    projectId,
    sessionOfUsers,
  }: {
    telegramUserId: number;
    projectId: string;
    sessionOfUsers: SessionOfUsers;
  }): Promise<void> {
    const user = await this.getUser(telegramUserId);

    const currentSessionOfUsers: SessionOfUsers =
      this.sessionOfUsers[this.getKey({ telegramUserId, projectId })] || {};
    currentSessionOfUsers.requestsMetadata = [
      ...sessionOfUsers.requestsMetadata,
    ];
    currentSessionOfUsers.responsesMetadata = [
      ...sessionOfUsers.responsesMetadata,
    ];

    await this.prismaClientService.dialogflowSession.upsert({
      create: {
        userId: user.id,
        projectId,
        sessionId: sessionOfUsers.sessionId,
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        requestsMetadata: currentSessionOfUsers.requestsMetadata as any,
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        responsesMetadata: currentSessionOfUsers.responsesMetadata as any,
      },
      update: {
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        requestsMetadata: currentSessionOfUsers.requestsMetadata as any,
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        responsesMetadata: currentSessionOfUsers.responsesMetadata as any,
      },
      where: {
        userId_projectId_sessionId: {
          projectId,
          userId: user.id,
          sessionId: sessionOfUsers.sessionId,
        },
      },
    });
    this.sessionOfUsers[this.getKey({ telegramUserId, projectId })] = {
      sessionId: sessionOfUsers.sessionId,
      requestsMetadata: currentSessionOfUsers.requestsMetadata,
      responsesMetadata: currentSessionOfUsers.responsesMetadata,
    };
  }

  async resetUserSession({
    telegramUserId,
    projectId,
  }: {
    telegramUserId: number;
    projectId: string;
  }) {
    const defaultUserSession =
      await this.prismaClientService.dialogflowSession.findFirst({
        where: {
          User: { telegramId: telegramUserId.toString() },
          projectId,
        },
      });
    if (defaultUserSession) {
      await this.prismaClientService.dialogflowSession.updateMany({
        data: {
          requestsMetadata: [],
          responsesMetadata: [],
        },
        where: {
          sessionId: defaultUserSession.sessionId,
          projectId,
        },
      });
      this.sessionOfUsers[this.getKey({ telegramUserId, projectId })] = {
        sessionId: defaultUserSession.sessionId,
        requestsMetadata: [],
        responsesMetadata: [],
      };
    }
  }

  private getKey({
    telegramUserId,
    projectId,
  }: {
    telegramUserId: number;
    projectId: string;
  }) {
    return `${telegramUserId}_${projectId}`;
  }
}
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Add service with command logics

libs/dialogflow/server/src/lib/dialogflow-services/dialogflow.service.ts

import dialogflow, { protos } from '@google-cloud/dialogflow';
import {
  BotCommandsEnum,
  BotCommandsProvider,
  BotCommandsProviderActionMsg,
  BotCommandsProviderActionResultType,
  BotСommandsToolsService,
  OnAfterBotCommands,
} from '@kaufman-bot/core/server';
import { DebugService } from '@kaufman-bot/debug-messages/server';
import { Inject, Injectable, Logger } from '@nestjs/common';
import { v4 } from 'uuid';
import {
  DialogflowConfig,
  DIALOGFLOW_CONFIG,
} from '../dialogflow-config/dialogflow.config';
import { DialogflowStorage } from './dialogflow.storage';

@Injectable()
export class DialogflowService
  implements BotCommandsProvider, OnAfterBotCommands
{
  private readonly logger = new Logger(DialogflowService.name);

  constructor(
    @Inject(DIALOGFLOW_CONFIG)
    private readonly dialogflowConfig: DialogflowConfig,
    private readonly dialogflowStorage: DialogflowStorage,
    private readonly botСommandsToolsService: BotСommandsToolsService,
    private readonly debugService: DebugService
  ) {}

  async onAfterBotCommands<
    TMsg extends BotCommandsProviderActionMsg = BotCommandsProviderActionMsg
  >(
    result: BotCommandsProviderActionResultType<TMsg>,
    msg: TMsg,
    ctx?,
    defaultHandler?: () => Promise<unknown>
  ): Promise<{ result: BotCommandsProviderActionResultType<TMsg>; msg: TMsg }> {
    if (!defaultHandler && result === null) {
      msg.text = `dialog ${msg.text}`;
      const dialogResult = await this.onMessage<TMsg>(msg, ctx);
      if (dialogResult !== null) {
        return { result: dialogResult, msg };
      }
    }

    if (result !== null) {
      this.debugService.sendDebugInfo(
        msg,
        ctx,
        `call:resetUserSession`,
        this.dialogflowConfig.name
      );
      // reset last session if unhandled with dialog commands
      await this.dialogflowStorage.resetUserSession({
        telegramUserId: msg.from.id,
        projectId: this.dialogflowConfig.projectId,
      });
    }

    return { result, msg };
  }

  async onHelp<
    TMsg extends BotCommandsProviderActionMsg = BotCommandsProviderActionMsg
  >(msg: TMsg, ctx): Promise<BotCommandsProviderActionResultType<TMsg>> {
    return await this.onMessage(
      {
        ...msg,
        text: `${this.dialogflowConfig.name} ${BotCommandsEnum.help}`,
      },
      ctx
    );
  }

  async onMessage<
    TMsg extends BotCommandsProviderActionMsg = BotCommandsProviderActionMsg
  >(msg: TMsg, ctx): Promise<BotCommandsProviderActionResultType<TMsg>> {
    const locale = msg.from?.language_code || 'en';

    const spyWord = this.dialogflowConfig.spyWords.find((spyWord) =>
      this.botСommandsToolsService.checkCommands(msg.text, [spyWord], locale)
    );
    if (spyWord) {
      if (
        this.botСommandsToolsService.checkCommands(
          msg.text,
          [BotCommandsEnum.help],
          locale
        )
      ) {
        return {
          type: 'markdown',
          markdown: this.botСommandsToolsService.generateHelpMessage(
            locale,
            this.dialogflowConfig.name,
            this.dialogflowConfig.descriptions,
            this.dialogflowConfig.usage
          ),
        };
      }

      const preparedText = this.botСommandsToolsService.clearCommands(
        msg.text,
        [spyWord],
        locale
      );

      const processedMsg = await this.process(msg, ctx, locale, preparedText);

      if (typeof processedMsg === 'string') {
        return {
          type: 'text',
          text: processedMsg,
        };
      }
      if (processedMsg) {
        return { type: 'message', message: processedMsg };
      }

      this.logger.warn(`Unhandled commands for text: "${msg.text}"`);
      this.logger.debug(msg);
    }
    return null;
  }

  private async process<
    TMsg extends BotCommandsProviderActionMsg = BotCommandsProviderActionMsg
  >(msg: TMsg, ctx, locale: string, text: string) {
    const ts = +new Date();
    const current = await this.dialogflowStorage.getUserSession({
      telegramUserId: msg.from.id,
      projectId: this.dialogflowConfig.projectId,
    });
    const sessionId = current ? current.sessionId : v4();
    const sessionClient = new dialogflow.SessionsClient();
    const sessionPath = sessionClient.projectAgentSessionPath(
      this.dialogflowConfig.projectId,
      sessionId
    );

    const request: protos.google.cloud.dialogflow.v2.IDetectIntentRequest = {
      session: sessionPath,
      queryInput: {
        text: {
          text: text,
          languageCode: locale,
        },
      },
    };

    const responses = await sessionClient.detectIntent(request);
    this.debugService.sendDebugInfo(
      msg,
      ctx,
      'Detected intent',
      this.dialogflowConfig.name
    );
    const result = responses[0].queryResult;
    if (!result) {
      this.debugService.sendDebugInfo(
        msg,
        ctx,
        `Result not set`,
        this.dialogflowConfig.name
      );
      return null;
    }
    this.debugService.sendDebugInfo(
      msg,
      ctx,
      {
        Query: result.queryText,
        Response: result.fulfillmentText,
      },
      this.dialogflowConfig.name
    );
    if (result.intent) {
      if (current) {
        this.debugService.sendDebugInfo(
          msg,
          ctx,
          `call:appendToUserSession`,
          this.dialogflowConfig.name
        );
        await this.dialogflowStorage.appendToUserSession({
          telegramUserId: msg.from.id,
          projectId: this.dialogflowConfig.projectId,
          sessionOfUsers: {
            sessionId,
            requestsMetadata: [{ ts, request }],
            responsesMetadata: [{ ts, response: responses[0] }],
          },
        });
      } else {
        this.debugService.sendDebugInfo(
          msg,
          ctx,
          `call:setUserSession`,
          this.dialogflowConfig.name
        );
        await this.dialogflowStorage.setUserSession({
          telegramUserId: msg.from.id,
          projectId: this.dialogflowConfig.projectId,
          sessionOfUsers: {
            sessionId,
            requestsMetadata: [{ ts, request }],
            responsesMetadata: [{ ts, response: responses[0] }],
          },
        });
      }
      this.debugService.sendDebugInfo(
        msg,
        ctx,
        `Intent: ${result.intent.displayName}`,
        this.dialogflowConfig.name
      );
    } else {
      this.debugService.sendDebugInfo(
        msg,
        ctx,
        'No intent matched.',
        this.dialogflowConfig.name
      );
    }
    return result.fulfillmentText;
  }
}
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Add module

libs/dialogflow/server/src/lib/dialogflow.module.ts

import {
  BotCommandsModule,
  BOT_COMMANDS_PROVIDER,
  PrismaClientModule,
} from '@kaufman-bot/core/server';
import { DebugMessagesModule } from '@kaufman-bot/debug-messages/server';
import { DynamicModule, Module } from '@nestjs/common';
import { getText } from 'class-validator-multi-lang';
import { CustomInjectorModule } from 'nestjs-custom-injector';
import { TranslatesModule } from 'nestjs-translates';
import {
  DialogflowConfig,
  DIALOGFLOW_CONFIG,
} from './dialogflow-config/dialogflow.config';
import { DialogflowService } from './dialogflow-services/dialogflow.service';
import { DialogflowStorage } from './dialogflow-services/dialogflow.storage';

@Module({
  imports: [
    TranslatesModule,
    PrismaClientModule,
    BotCommandsModule,
    DebugMessagesModule,
  ],
  providers: [DialogflowStorage],
  exports: [
    TranslatesModule,
    PrismaClientModule,
    BotCommandsModule,
    DebugMessagesModule,
    DialogflowStorage,
  ],
})
export class DialogflowModule {
  static forRoot(config: Pick<DialogflowConfig, 'projectId'>): DynamicModule {
    return {
      module: DialogflowModule,
      imports: [
        CustomInjectorModule.forFeature({
          imports: [DialogflowModule],
          providers: [
            {
              provide: DIALOGFLOW_CONFIG,
              useValue: <DialogflowConfig>{
                name: getText('Dialogflow'),
                usage: [
                  getText('dialog hello'),
                  getText('ai hello'),
                  getText('debug help'),
                  getText('ai help'),
                ],
                descriptions: getText(
                  'Commands for process request with dialogflow intents'
                ),
                spyWords: [getText('dialog'), getText('ai')],
                ...config,
              },
            },
            {
              provide: BOT_COMMANDS_PROVIDER,
              useClass: DialogflowService,
            },
          ],
          exports: [DIALOGFLOW_CONFIG],
        }),
      ],
    };
  }
}
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Update application files

Update AppService

apps/server/src/app/app.service.ts

import { BotСommandsService } from '@kaufman-bot/core/server';
import { Injectable, Logger } from '@nestjs/common';
import { Hears, On, Start, Update } from 'nestjs-telegraf';
import { Context } from 'telegraf';

@Update()
@Injectable()
export class AppService {
  private readonly logger = new Logger(AppService.name);

  constructor(private readonly botСommandsService: BotСommandsService) {}

  getData(): { message: string } {
    return { message: 'Welcome to server!' };
  }

  @Start()
  async startCommand(ctx: Context) {
    await this.botСommandsService.process(ctx, () => ctx.reply('Welcome'));
  }

  @On('sticker')
  async onSticker(ctx) {
    await this.botСommandsService.process(ctx, () => ctx.reply('👍'));
  }

  @Hears('hi')
  async hearsHi(ctx: Context) {
    await this.botСommandsService.process(ctx, () => ctx.reply('Hey there'));
  }

  @On('text')
  async onMessage(ctx) {
    await this.botСommandsService.process(ctx);
  }
}
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Update AppModule

apps/server/src/app/app.module.ts

import {
  BotCommandsModule,
  PrismaClientModule,
} from '@kaufman-bot/core/server';
import { CurrencyConverterModule } from '@kaufman-bot/currency-converter/server';
import { DebugMessagesModule } from '@kaufman-bot/debug-messages/server';
import { DialogflowModule } from '@kaufman-bot/dialogflow/server';
import { FactsGeneratorModule } from '@kaufman-bot/facts-generator/server';
import {
  DEFAULT_LANGUAGE,
  LanguageSwitherModule,
} from '@kaufman-bot/language-swither/server';
import { Module } from '@nestjs/common';
import env from 'env-var';
import { TelegrafModule } from 'nestjs-telegraf';
import {
  getDefaultTranslatesModuleOptions,
  TranslatesModule,
} from 'nestjs-translates';
import { join } from 'path';
import { AppController } from './app.controller';
import { AppService } from './app.service';

@Module({
  imports: [
    TelegrafModule.forRoot({
      token: env.get('TELEGRAM_BOT_TOKEN').required().asString(),
    }),
    PrismaClientModule.forRoot({
      databaseUrl: env.get('SERVER_POSTGRES_URL').required().asString(),
      logging: 'long_queries',
      maxQueryExecutionTime: 5000,
    }),
    TranslatesModule.forRoot(
      getDefaultTranslatesModuleOptions({
        localePaths: [
          join(__dirname, 'assets', 'i18n'),
          join(__dirname, 'assets', 'i18n', 'class-validator-messages'),
        ],
        vendorLocalePaths: [join(__dirname, 'assets', 'i18n')],
        locales: [DEFAULT_LANGUAGE, 'ru'],
      })
    ),
    BotCommandsModule,
    LanguageSwitherModule.forRoot(),
    DebugMessagesModule.forRoot(),
    CurrencyConverterModule.forRoot(),
    FactsGeneratorModule.forRoot(),
    DialogflowModule.forRoot({
      projectId: env.get('DIALOGFLOW_PROJECT_ID').required().asString(),
    }),
  ],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule {}
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Update .env.local

.env.local

TELEGRAM_BOT_TOKEN=1111111:AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
ROOT_POSTGRES_USER=postgres
ROOT_POSTGRES_PASSWORD=postgres
ROOT_POSTGRES_URL=postgres://${ROOT_POSTGRES_USER}:${ROOT_POSTGRES_PASSWORD}@localhost:5432/postgres?schema=public
SERVER_POSTGRES_URL=postgres://admin_develop:password_develop@localhost:5432/kaufman_bot_develop?schema=public
GOOGLE_APPLICATION_CREDENTIALS=google-credentials.json
DIALOGFLOW_PROJECT_ID=service-account-urui
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Update all ts files and translates

npm run generate

Update all dictionaries with po editor

Need to translate

Translated

Convert all po files to json

npm run generate

Add environments and file with google-credentials to github

Add google-credentials.json

Because file is multiline, you must convert it to base 64 string

echo $(cat google-credentials.json | base64 -w0)
echo $(cat google-credentials.json | base64 -w0)

Set string in github env
Set string in github env

Add project id

Image description

View all envs

Image description

Update for deploy

Update github action config

.github/workflows/develop.deploy.yml

name: "deploy"

# yamllint disable-line rule:truthy
on:
  push:
    branches:
      - feature/73

jobs:
  migrate:
    runs-on: [self-hosted, develop-vps]
    environment: dev
    steps:
      - name: Cloning repo
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Apply migrations
        run: |
          curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash
          . ~/.nvm/nvm.sh
          nvm --version
          nvm install v16.13.2
          nvm use v16.13.2
          npm i --force
          export POSTGRES_HOST=$(dokku postgres:info global-postgres --internal-ip)
          export ROOT_POSTGRES_URL=postgres://postgres:${{secrets.ROOT_POSTGRES_PASSWORD}}@${POSTGRES_HOST}:5432/postgres?schema=public
          export SERVER_POSTGRES_URL=${{secrets.SERVER_POSTGRES_URL}}
          npm run rucken -- postgres
          export DATABASE_URL=$SERVER_POSTGRES_URL && npm run migrate
          dokku config:set --no-restart kaufman-bot SERVER_POSTGRES_URL=$SERVER_POSTGRES_URL
          dokku config:set --no-restart --global POSTGRES_HOST=global-postgres
          dokku config:set --no-restart kaufman-bot GOOGLE_APPLICATION_CREDENTIALS=google-credentials.json
          dokku config:set --no-restart kaufman-bot GOOGLE_CREDENTIALS=${{secrets.GOOGLE_CREDENTIALS}}
          dokku config:set --no-restart kaufman-bot DIALOGFLOW_PROJECT_ID=${{secrets.DIALOGFLOW_PROJECT_ID}}

  deploy:
    needs: [migrate]
    runs-on: ubuntu-latest
    environment: dev
    steps:
      - name: Cloning repo
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Push to dokku
        uses: dokku/github-action@master
        with:
          branch: "feature/73"
          git_remote_url: "ssh://dokku@${{secrets.HOST}}:22/kaufman-bot"
          ssh_private_key: ${{secrets.SSH_PRIVATE_KEY}}
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Update start sections in package.json

package.json

...
  "scripts": {
    ...
    "start": "echo $GOOGLE_CREDENTIALS | base64 --decode > ./$GOOGLE_APPLICATION_CREDENTIALS && node dist/apps/server/main.js",
    ...
  }
...
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Check new logic in telegram bot

Common help message
Common help message

Help message for dialogflow command
Help message for dialogflow command

Check work command with use spy word
Check work command with use spy word

Check work global handler for all unhandled messages
Image description

Check disabled work global handler if set default application handler
result 1
result 2

Check logic in Russia language
Check logic in Russia language

Show debug information of process
Image description

In the next post, I will add different multilingual settings for facts commands...

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