Cloudflare Workers con Claude Code

Acelerando el desarrollo con Cloudflare Workers y Claude Code

Cloudflare Workers es una plataforma serverless que permite ejecutar JavaScript/TypeScript en la red global de Cloudflare. Basado en el motor V8, logra respuestas rapidas sin cold start. Aprovechando Claude Code, puedes manejar eficientemente las API y bindings especificos de Workers.

Inicio del proyecto

> Crea un proyecto de Cloudflare Workers.
> Con una configuracion que use el framework Hono y la base de datos D1.

npm create cloudflare@latest my-worker -- --template=hello-world
cd my-worker
npm install hono

# wrangler.toml
name = "my-api"
main = "src/index.ts"
compatibility_date = "2024-12-01"

[[d1_databases]]
binding = "DB"
database_name = "my-database"
database_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

[[kv_namespaces]]
binding = "CACHE"
id = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"

[[r2_buckets]]
binding = "STORAGE"
bucket_name = "my-bucket"

Implementacion de API con Hono

> Crea una API CRUD con el framework Hono.
> Implementa tambien la integracion con la base de datos D1.

// src/index.ts
import { Hono } from 'hono';
import { cors } from 'hono/cors';
import { jwt } from 'hono/jwt';

type Bindings = {
  DB: D1Database;
  CACHE: KVNamespace;
  STORAGE: R2Bucket;
  JWT_SECRET: string;
};

const app = new Hono<{ Bindings: Bindings }>();

app.use('/api/*', cors());

// Lista de articulos
app.get('/api/posts', async (c) => {
  const { results } = await c.env.DB.prepare(
    'SELECT * FROM posts ORDER BY created_at DESC LIMIT 20'
  ).all();

  return c.json({ posts: results });
});

// Crear articulo
app.post('/api/posts', async (c) => {
  const { title, content } = await c.req.json();

  const result = await c.env.DB.prepare(
    'INSERT INTO posts (title, content, created_at) VALUES (?, ?, datetime())'
  )
    .bind(title, content)
    .run();

  // Limpiar cache
  await c.env.CACHE.delete('posts:latest');

  return c.json({ id: result.meta.last_row_id }, 201);
});

// Subida de imagenes (R2)
app.post('/api/upload', async (c) => {
  const formData = await c.req.formData();
  const file = formData.get('file') as File;

  if (!file) {
    return c.json({ error: 'File required' }, 400);
  }

  const key = `uploads/${Date.now()}-${file.name}`;
  await c.env.STORAGE.put(key, file.stream(), {
    httpMetadata: { contentType: file.type },
  });

  return c.json({ key, url: `/api/files/${key}` });
});

export default app;

Migraciones de base de datos D1

-- migrations/0001_create_tables.sql
CREATE TABLE IF NOT EXISTS posts (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  title TEXT NOT NULL,
  content TEXT NOT NULL,
  slug TEXT UNIQUE,
  published BOOLEAN DEFAULT FALSE,
  created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
  updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX idx_posts_slug ON posts(slug);
CREATE INDEX idx_posts_published ON posts(published, created_at);

# Ejecutar migraciones
npx wrangler d1 migrations apply my-database

# Desarrollo local
npx wrangler d1 migrations apply my-database --local
npx wrangler dev

Aprovechamiento de cache con KV

// src/cache.ts
export async function getCachedData<T>(
  kv: KVNamespace,
  key: string,
  fetcher: () => Promise<T>,
  ttl = 3600
): Promise<T> {
  const cached = await kv.get(key, 'json');
  if (cached) return cached as T;

  const data = await fetcher();
  await kv.put(key, JSON.stringify(data), { expirationTtl: ttl });
  return data;
}

// Ejemplo de uso
app.get('/api/stats', async (c) => {
  const stats = await getCachedData(
    c.env.CACHE,
    'stats:daily',
    async () => {
      const { results } = await c.env.DB.prepare(
        'SELECT COUNT(*) as count FROM posts WHERE published = TRUE'
      ).all();
      return results[0];
    },
    300 // Cache de 5 minutos
  );

  return c.json(stats);
});

Despliegue y monitoreo

# Despliegue
npx wrangler deploy

# Verificar logs
npx wrangler tail

# Configurar secretos
npx wrangler secret put JWT_SECRET

Resumen

Combinando los completos bindings de Cloudflare Workers con Claude Code, puedes construir eficientemente APIs full-stack que se ejecutan en el edge. Consulta tambien la guia de funciones serverless y la introduccion a edge computing.

Para mas detalles sobre Cloudflare Workers, consulta la documentacion oficial de Cloudflare Workers.