hello hono

server.js

import { Hono } from 'hono';
import { cors } from 'hono/cors';
import { logger } from 'hono/logger';
import { serve } from '@hono/node-server';

const app = new Hono();

// ミドルウェア設定
app.use('*', logger());
app.use('*', cors());

// バリデーション用のヘルパー関数
const validateRequestBody = (body) => {
  if (!body || typeof body !== 'object') {
    return { isValid: false, error: 'Request body must be a JSON object' };
  }
  
  if (!body.name || typeof body.name !== 'string') {
    return { isValid: false, error: 'Name field is required and must be a string' };
  }
  
  if (body.name.trim() === '') {
    return { isValid: false, error: 'Name cannot be empty' };
  }
  
  return { isValid: true, name: body.name.trim() };
};

// ヘルスチェック用エンドポイント
app.get('/', (c) => {
  return c.json({
    message: 'Greeting API Server is running!',
    endpoints: {
      greet: 'POST /greet',
      goodbye: 'POST /goodbye'
    },
    timestamp: new Date().toISOString()
  });
});

// greet ハンドラ
app.post('/greet', async (c) => {
  try {
    const body = await c.req.json();
    const validation = validateRequestBody(body);
    
    if (!validation.isValid) {
      return c.json(
        { error: validation.error },
        400
      );
    }
    
    const greeting = `Hello ${validation.name}`;
    
    return c.json({
      greet: greeting
    });
    
  } catch (error) {
    console.error('Error in /greet handler:', error);
    
    // JSONパースエラーの場合
    if (error instanceof SyntaxError) {
      return c.json(
        { error: 'Invalid JSON in request body' },
        400
      );
    }
    
    return c.json(
      { error: 'Internal server error' },
      500
    );
  }
});

// goodbye ハンドラ
app.post('/goodbye', async (c) => {
  try {
    const body = await c.req.json();
    const validation = validateRequestBody(body);
    
    if (!validation.isValid) {
      return c.json(
        { error: validation.error },
        400
      );
    }
    
    const farewell = `Goodbye ${validation.name}`;
    
    return c.json({
      goodbye: farewell
    });
    
  } catch (error) {
    console.error('Error in /goodbye handler:', error);
    
    // JSONパースエラーの場合
    if (error instanceof SyntaxError) {
      return c.json(
        { error: 'Invalid JSON in request body' },
        400
      );
    }
    
    return c.json(
      { error: 'Internal server error' },
      500
    );
  }
});

// 404エラーハンドラ
app.notFound((c) => {
  return c.json(
    { 
      error: 'Not Found',
      message: 'The requested endpoint does not exist',
      availableEndpoints: ['/greet', '/goodbye']
    },
    404
  );
});

// グローバルエラーハンドラ
app.onError((err, c) => {
  console.error('Unhandled error:', err);
  return c.json(
    { error: 'Internal Server Error' },
    500
  );
});

// サーバー起動と継続実行
const port = 8000;

console.log(`🚀 Starting server on port ${port}...`);

// Honoサーバーを継続起動
serve({
  fetch: app.fetch,
  port: port,
}, (info) => {
  console.log(`✅ Server is running on http://localhost:${info.port}`);
  console.log('Available endpoints:');
  console.log('  GET  / - Health check');
  console.log('  POST /greet - Greeting message');
  console.log('  POST /goodbye - Farewell message');
  console.log('Press Ctrl+C to stop the server');
});

// Graceful shutdown
process.on('SIGINT', () => {
  console.log('\n👋 Received SIGINT. Gracefully shutting down...');
  process.exit(0);
});

process.on('SIGTERM', () => {
  console.log('\n👋 Received SIGTERM. Gracefully shutting down...');
  process.exit(0);
});