TwinMind Reference Architecture

Overview

Production-ready architecture patterns for TwinMind meeting AI integrations.

Prerequisites

• Understanding of layered architecture
• TwinMind API knowledge
• TypeScript project setup
• Testing framework configured

Project Structure

my-twinmind-project/
├── src/
│   ├── twinmind/
│   │   ├── client.ts           # Singleton client wrapper
│   │   ├── config.ts           # Environment configuration
│   │   ├── types.ts            # TypeScript types
│   │   ├── errors.ts           # Custom error classes
│   │   └── handlers/
│   │       ├── webhooks.ts     # Webhook handlers
│   │       └── events.ts       # Event processing
│   ├── services/
│   │   └── meeting/
│   │       ├── index.ts        # Service facade
│   │       ├── transcription.ts # Transcription service
│   │       ├── summary.ts      # Summary generation
│   │       ├── actions.ts      # Action item extraction
│   │       └── cache.ts        # Caching layer
│   ├── integrations/
│   │   ├── calendar/           # Calendar sync
│   │   ├── slack/              # Slack notifications
│   │   ├── linear/             # Task management
│   │   └── email/              # Follow-up emails
│   ├── api/
│   │   ├── routes/
│   │   │   ├── meetings.ts     # Meeting endpoints
│   │   │   ├── transcripts.ts  # Transcript endpoints
│   │   │   └── webhooks.ts     # Webhook endpoint
│   │   └── middleware/
│   │       ├── auth.ts         # Authentication
│   │       ├── rateLimit.ts    # Rate limiting
│   │       └── validation.ts   # Request validation
│   ├── jobs/
│   │   ├── sync.ts             # Background sync job
│   │   ├── cleanup.ts          # Data cleanup job
│   │   └── reports.ts          # Report generation
│   └── utils/
│       ├── audio.ts            # Audio processing
│       ├── logging.ts          # Structured logging
│       └── metrics.ts          # Prometheus metrics
├── tests/
│   ├── unit/
│   │   └── twinmind/
│   ├── integration/
│   │   └── twinmind/
│   └── e2e/
│       └── meeting-flow.test.ts
├── config/
│   ├── twinmind.development.json
│   ├── twinmind.staging.json
│   └── twinmind.production.json
└── docs/
    ├── ARCHITECTURE.md
    └── RUNBOOK.md

Layer Architecture

┌─────────────────────────────────────────────────────┐
│                   API Layer                          │
│        (Controllers, Routes, Webhooks)               │
├─────────────────────────────────────────────────────┤
│                Service Layer                         │
│      (Business Logic, Orchestration)                 │
├─────────────────────────────────────────────────────┤
│              TwinMind Layer                          │
│       (Client, Types, Error Handling)                │
├─────────────────────────────────────────────────────┤
│             Integration Layer                        │
│    (Calendar, Slack, Linear, Email)                  │
├─────────────────────────────────────────────────────┤
│            Infrastructure Layer                      │
│       (Cache, Queue, Monitoring)                     │
└─────────────────────────────────────────────────────┘

Key Components

Step 1: Client Wrapper

// src/twinmind/client.ts
import axios, { AxiosInstance } from 'axios';
import { TwinMindConfig, loadConfig } from './config';
import { TranscriptCache } from '../services/meeting/cache';
import { MetricsCollector } from '../utils/metrics';

export class TwinMindService {
  private client: AxiosInstance;
  private cache: TranscriptCache;
  private metrics: MetricsCollector;
  private config: TwinMindConfig;

  constructor(config?: TwinMindConfig) {
    this.config = config || loadConfig();

    this.client = axios.create({
      baseURL: this.config.baseUrl,
      headers: {
        'Authorization': `Bearer ${this.config.apiKey}`,
        'Content-Type': 'application/json',
      },
      timeout: this.config.timeout,
    });

    this.cache = new TranscriptCache(this.config.cacheOptions);
    this.metrics = new MetricsCollector('twinmind');

    this.setupInterceptors();
  }

  private setupInterceptors(): void {
    // Request logging
    this.client.interceptors.request.use((config) => {
      this.metrics.incrementCounter('requests', { method: config.method });
      return config;
    });

    // Response handling
    this.client.interceptors.response.use(
      (response) => {
        this.metrics.recordLatency(
          'request_duration',
          response.config.metadata?.startTime
        );
        return response;
      },
      (error) => {
        this.metrics.incrementCounter('errors', {
          status: error.response?.status || 'network',
        });
        throw error;
      }
    );
  }

  async transcribe(audioUrl: string, options?: TranscriptionOptions): Promise<Transcript> {
    return this.cache.getOrFetch(
      `transcript:${audioUrl}`,
      () => this.metrics.track(
        'transcribe',
        () => this.client.post('/transcribe', { audio_url: audioUrl, ...options })
      )
    );
  }

  async summarize(transcriptId: string): Promise<Summary> {
    return this.metrics.track(
      'summarize',
      () => this.client.post('/summarize', { transcript_id: transcriptId })
    );
  }

  async search(query: string, options?: SearchOptions): Promise<SearchResult[]> {
    return this.client.get('/search', { params: { q: query, ...options } });
  }
}

// Singleton instance
let instance: TwinMindService | null = null;

export function getTwinMindService(): TwinMindService {
  if (!instance) {
    instance = new TwinMindService();
  }
  return instance;
}

Step 2: Service Layer

// src/services/meeting/index.ts
import { getTwinMindService } from '../../twinmind/client';
import { TranscriptionService } from './transcription';
import { SummaryService } from './summary';
import { ActionItemService } from './actions';
import { CalendarIntegration } from '../../integrations/calendar';
import { SlackIntegration } from '../../integrations/slack';

export interface MeetingResult {
  transcriptId: string;
  transcript: Transcript;
  summary: Summary;
  actionItems: ActionItem[];
  participants: Participant[];
}

export class MeetingService {
  private twinmind = getTwinMindService();
  private transcription = new TranscriptionService();
  private summaryService = new SummaryService();
  private actionService = new ActionItemService();
  private calendar = new CalendarIntegration();
  private slack = new SlackIntegration();

  async processMeeting(
    audioUrl: string,
    options: ProcessMeetingOptions = {}
  ): Promise<MeetingResult> {
    // Get calendar context
    const calendarEvent = options.calendarEventId
      ? await this.calendar.getEvent(options.calendarEventId)
      : null;

    // Transcribe
    const transcript = await this.transcription.transcribe(audioUrl, {
      title: calendarEvent?.title || options.title,
      attendees: calendarEvent?.attendees,
    });

    // Generate summary and extract action items in parallel
    const [summary, actionItems] = await Promise.all([
      this.summaryService.generate(transcript.id),
      this.actionService.extract(transcript.id),
    ]);

    // Identify participants
    const participants = await this.identifyParticipants(
      transcript,
      calendarEvent?.attendees
    );

    // Notify if configured
    if (options.notifySlack) {
      await this.slack.notifyMeetingComplete({
        title: transcript.title,
        summary: summary.summary,
        actionItems,
      });
    }

    return {
      transcriptId: transcript.id,
      transcript,
      summary,
      actionItems,
      participants,
    };
  }

  private async identifyParticipants(
    transcript: Transcript,
    attendees?: string[]
  ): Promise<Participant[]> {
    // Match speakers to attendees
    const speakers = transcript.speakers || [];

    return speakers.map((speaker, index) => ({
      id: speaker.id,
      name: attendees?.[index] || speaker.name || `Speaker ${index + 1}`,
      speakingTime: this.calculateSpeakingTime(transcript.segments, speaker.id),
    }));
  }

  private calculateSpeakingTime(segments: Segment[], speakerId: string): number {
    return segments
      .filter(s => s.speaker_id === speakerId)
      .reduce((total, s) => total + (s.end - s.start), 0);
  }
}

Step 3: Error Boundary

// src/twinmind/errors.ts
export class TwinMindError extends Error {
  constructor(
    message: string,
    public readonly code: string,
    public readonly statusCode?: number,
    public readonly retryable: boolean = false,
    public readonly originalError?: Error
  ) {
    super(message);
    this.name = 'TwinMindError';
  }

  static fromApiError(error: any): TwinMindError {
    const status = error.response?.status;
    const message = error.response?.data?.message || error.message;
    const code = error.response?.data?.code || 'UNKNOWN';

    switch (status) {
      case 401:
        return new TwinMindError(message, 'AUTH_FAILED', status, false);
      case 429:
        return new TwinMindError(message, 'RATE_LIMITED', status, true);
      case 500:
      case 502:
      case 503:
        return new TwinMindError(message, 'SERVER_ERROR', status, true);
      default:
        return new TwinMindError(message, code, status, false, error);
    }
  }
}

export function wrapWithErrorHandling<T>(
  operation: () => Promise<T>
): Promise<T> {
  return operation().catch((error) => {
    throw TwinMindError.fromApiError(error);
  });
}

Step 4: Health Check

// src/twinmind/health.ts
export interface HealthStatus {
  status: 'healthy' | 'degraded' | 'unhealthy';
  checks: HealthCheck[];
  timestamp: Date;
}

export interface HealthCheck {
  name: string;
  status: 'pass' | 'warn' | 'fail';
  latencyMs?: number;
  message?: string;
}

export async function checkHealth(): Promise<HealthStatus> {
  const checks: HealthCheck[] = [];

  // Check TwinMind API
  const apiCheck = await checkApiHealth();
  checks.push(apiCheck);

  // Check cache
  const cacheCheck = await checkCacheHealth();
  checks.push(cacheCheck);

  // Check database
  const dbCheck = await checkDatabaseHealth();
  checks.push(dbCheck);

  // Determine overall status
  const hasFailure = checks.some(c => c.status === 'fail');
  const hasWarning = checks.some(c => c.status === 'warn');

  return {
    status: hasFailure ? 'unhealthy' : hasWarning ? 'degraded' : 'healthy',
    checks,
    timestamp: new Date(),
  };
}

async function checkApiHealth(): Promise<HealthCheck> {
  const start = Date.now();
  try {
    const service = getTwinMindService();
    await service.healthCheck();
    return {
      name: 'twinmind_api',
      status: 'pass',
      latencyMs: Date.now() - start,
    };
  } catch (error: any) {
    return {
      name: 'twinmind_api',
      status: 'fail',
      latencyMs: Date.now() - start,
      message: error.message,
    };
  }
}

Data Flow Diagram

                              ┌───────────────┐
                              │   Calendar    │
                              │   (Google)    │
                              └───────┬───────┘
                                      │ sync
┌──────────┐                 ┌────────▼────────┐
│  Client  │─────request────►│   API Gateway   │
│   App    │◄────response────│                 │
└──────────┘                 └────────┬────────┘
                                      │
                             ┌────────▼────────┐
                             │  Meeting        │
                             │  Service        │
                             └────────┬────────┘
                                      │
              ┌───────────────────────┼───────────────────────┐
              │                       │                       │
     ┌────────▼────────┐    ┌────────▼────────┐    ┌────────▼────────┐
     │  Transcription  │    │    Summary      │    │  Action Items   │
     │    Service      │    │    Service      │    │    Service      │
     └────────┬────────┘    └────────┬────────┘    └────────┬────────┘
              │                       │                       │
              └───────────────────────┼───────────────────────┘
                                      │
                             ┌────────▼────────┐
                             │   TwinMind      │
                             │     API         │
                             └────────┬────────┘
                                      │
              ┌───────────────────────┼───────────────────────┐
              │                       │                       │
     ┌────────▼────────┐    ┌────────▼────────┐    ┌────────▼────────┐
     │     Slack       │    │     Linear      │    │     Email       │
     │  (notifications)│    │    (tasks)      │    │  (follow-ups)   │
     └─────────────────┘    └─────────────────┘    └─────────────────┘

Configuration Management

// config/twinmind.ts
export interface TwinMindConfig {
  apiKey: string;
  baseUrl: string;
  environment: 'development' | 'staging' | 'production';
  timeout: number;
  retries: number;
  cacheOptions: {
    enabled: boolean;
    ttlSeconds: number;
  };
  features: {
    diarization: boolean;
    autoSummary: boolean;
    actionItemExtraction: boolean;
  };
}

export function loadConfig(): TwinMindConfig {
  const env = process.env.NODE_ENV || 'development';
  const envConfig = require(`./twinmind.${env}.json`);

  return {
    apiKey: process.env.TWINMIND_API_KEY!,
    baseUrl: process.env.TWINMIND_API_URL || 'https://api.twinmind.com/v1',
    environment: env as any,
    timeout: parseInt(process.env.TWINMIND_TIMEOUT || '30000'),
    retries: parseInt(process.env.TWINMIND_RETRIES || '3'),
    ...envConfig,
  };
}

Output

• Structured project layout
• Client wrapper with caching and metrics
• Service layer with business logic
• Error boundary implemented
• Health checks configured
• Configuration management

Error Handling

Resources

• TwinMind API Reference
• Clean Architecture
• TypeScript Best Practices

Flagship Skills

For multi-environment setup, see twinmind-multi-env-setup.