Data persistence with R2

import { getSandbox } from "@cloudflare/sandbox";

export { Sandbox } from "@cloudflare/sandbox";

export default {
	async fetch(request, env) {
		const url = new URL(request.url);
		const sandbox = getSandbox(env.Sandbox, "data-processor");

		// Mount R2 bucket to /data directory
		await sandbox.mountBucket("my-data-bucket", "/data", {
			endpoint: "https://YOUR_ACCOUNT_ID.r2.cloudflarestorage.com",
		});

		if (url.pathname === "/process") {
			// Process data and save to mounted R2
			const result = await sandbox.exec("python", {
				args: [
					"-c",
					`
import json
import os
from datetime import datetime

# Read input (or create sample data)
data = [
    {'id': 1, 'value': 42},
    {'id': 2, 'value': 87},
    {'id': 3, 'value': 15}
]

# Process: calculate sum and average
total = sum(item['value'] for item in data)
avg = total / len(data)

# Save results to mounted R2 (/data is the mounted bucket)
result = {
    'timestamp': datetime.now().isoformat(),
    'total': total,
    'average': avg,
    'processed_count': len(data)
}

os.makedirs('/data/results', exist_ok=True)
with open('/data/results/latest.json', 'w') as f:
    json.dump(result, f, indent=2)

print(json.dumps(result))
				`,
				],
			});

			return Response.json({
				message: "Data processed and saved to R2",
				result: JSON.parse(result.stdout),
			});
		}

		if (url.pathname === "/results") {
			// Read results from mounted R2
			const result = await sandbox.exec("cat", {
				args: ["/data/results/latest.json"],
			});

			if (!result.success) {
				return Response.json(
					{ error: "No results found yet" },
					{ status: 404 },
				);
			}

			return Response.json({
				message: "Results retrieved from R2",
				data: JSON.parse(result.stdout),
			});
		}

		if (url.pathname === "/destroy") {
			// Destroy sandbox to demonstrate persistence
			await sandbox.destroy();
			return Response.json({
				message: "Sandbox destroyed. Data persists in R2!",
			});
		}

		return new Response(
			`
Data Pipeline with Persistent Storage

Endpoints:
- POST /process  - Process data and save to R2
- GET /results   - Retrieve results from R2
- POST /destroy  - Destroy sandbox (data survives!)

Try this flow:
1. POST /process  (processes and saves to R2)
2. POST /destroy  (destroys sandbox)
3. GET /results   (data still accessible from R2)
		`,
			{ headers: { "Content-Type": "text/plain" } },
		);
	},
};

import { getSandbox, type Sandbox } from '@cloudflare/sandbox';

export { Sandbox } from '@cloudflare/sandbox';

interface Env {
	Sandbox: DurableObjectNamespace<Sandbox>;
	DATA_BUCKET: R2Bucket;
}

export default {
	async fetch(request: Request, env: Env): Promise<Response> {
		const url = new URL(request.url);
		const sandbox = getSandbox(env.Sandbox, 'data-processor');

		// Mount R2 bucket to /data directory
		await sandbox.mountBucket('my-data-bucket', '/data', {
			endpoint: 'https://YOUR_ACCOUNT_ID.r2.cloudflarestorage.com'
		});

		if (url.pathname === '/process') {
			// Process data and save to mounted R2
			const result = await sandbox.exec('python', {
				args: ['-c', `
import json
import os
from datetime import datetime

# Read input (or create sample data)
data = [
    {'id': 1, 'value': 42},
    {'id': 2, 'value': 87},
    {'id': 3, 'value': 15}
]

# Process: calculate sum and average
total = sum(item['value'] for item in data)
avg = total / len(data)

# Save results to mounted R2 (/data is the mounted bucket)
result = {
    'timestamp': datetime.now().isoformat(),
    'total': total,
    'average': avg,
    'processed_count': len(data)
}

os.makedirs('/data/results', exist_ok=True)
with open('/data/results/latest.json', 'w') as f:
    json.dump(result, f, indent=2)

print(json.dumps(result))
				`]
			});

			return Response.json({
				message: 'Data processed and saved to R2',
				result: JSON.parse(result.stdout)
			});
		}

		if (url.pathname === '/results') {
			// Read results from mounted R2
			const result = await sandbox.exec('cat', {
				args: ['/data/results/latest.json']
			});

			if (!result.success) {
				return Response.json({ error: 'No results found yet' }, { status: 404 });
			}

			return Response.json({
				message: 'Results retrieved from R2',
				data: JSON.parse(result.stdout)
			});
		}

		if (url.pathname === '/destroy') {
			// Destroy sandbox to demonstrate persistence
			await sandbox.destroy();
			return Response.json({ message: 'Sandbox destroyed. Data persists in R2!' });
		}

		return new Response(`
Data Pipeline with Persistent Storage

Endpoints:
- POST /process  - Process data and save to R2
- GET /results   - Retrieve results from R2
- POST /destroy  - Destroy sandbox (data survives!)

Try this flow:
1. POST /process  (processes and saves to R2)
2. POST /destroy  (destroys sandbox)
3. GET /results   (data still accessible from R2)
		`, { headers: { 'Content-Type': 'text/plain' } });
	}
};