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feat: Add R2 Storage Container Demo with API bindings
- Create complete R2 storage demo using Container API bindings instead of filesystem mounts - Implement Container app with R2 binding validation and info endpoints - Add comprehensive README with setup and usage instructions - Use new Container class helper methods for clean R2 integration - Demonstrate best practices for R2 API binding configuration
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‎r2-storage/Dockerfile‎

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FROM node:18-alpine
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WORKDIR /app
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# Create the mount directories that will be used for R2 buckets
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RUN mkdir -p /mnt/data /mnt/logs
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# Simple package.json for the container app
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COPY package.json ./
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RUN npm install
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# Copy the container application
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COPY container-app.js ./
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EXPOSE 8080
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CMD ["node", "container-app.js"]

‎r2-storage/README.md‎

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# R2 Storage Container Demo
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This demo shows how to use R2 bucket API bindings with Cloudflare Containers.
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## Features
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- **R2 Bucket Bindings**: Configure R2 bucket API access in containers
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- **Environment Variable Auto-Generation**: Automatic R2 binding config via environment variables
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- **API-Based Access**: Use R2 API bindings instead of filesystem operations
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- **Real-Time Logging**: See R2 binding configuration in container logs
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## Configuration
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### 1. Wrangler Configuration (`wrangler.jsonc`)
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```jsonc
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{
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"r2_buckets": [
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{
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"binding": "DATA_BUCKET",
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"bucket_name": "my-demo-data-bucket"
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},
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{
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"binding": "LOGS_BUCKET",
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"bucket_name": "my-demo-logs-bucket"
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}
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]
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}
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```
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### 2. Container R2 Binding Setup
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```typescript
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export class R2StorageContainer extends Container<Env> {
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constructor(ctx: DurableObjectState, env: Env) {
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super(ctx, env);
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// Configure R2 bindings - API-based access
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this.r2Bindings = [
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{
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binding: 'DATA_BUCKET',
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bucketName: 'my-demo-data-bucket'
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},
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{
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binding: 'LOGS_BUCKET',
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bucketName: 'my-demo-logs-bucket'
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}
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];
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}
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}
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```
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## Environment Variables Generated
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The container automatically receives these environment variables for API access:
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```bash
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R2_DATA_BUCKET_BINDING=DATA_BUCKET
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R2_DATA_BUCKET_BUCKET=my-demo-data-bucket
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R2_LOGS_BUCKET_BINDING=LOGS_BUCKET
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R2_LOGS_BUCKET_BUCKET=my-demo-logs-bucket
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```
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## Usage
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1. **Create R2 buckets** (if they don't exist):
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```bash
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wrangler r2 bucket create my-demo-data-bucket
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wrangler r2 bucket create my-demo-logs-bucket
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```
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2. **Start development**:
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```bash
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wrangler dev
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```
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3. **Test endpoints**:
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- `/` - Demo homepage with links
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- `/start-container` - Initialize container with R2 bindings
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- `/test-r2-env` - Show R2 environment variables
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- `/test-r2-bindings` - Test R2 binding configuration
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## Expected Log Output
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When the container starts, you'll see:
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```
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=== R2 STORAGE CONTAINER STARTUP ===
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R2 Environment Variables:
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R2_DATA_BUCKET_BINDING=DATA_BUCKET
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R2_DATA_BUCKET_BUCKET=my-demo-data-bucket
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R2_LOGS_BUCKET_BINDING=LOGS_BUCKET
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R2_LOGS_BUCKET_BUCKET=my-demo-logs-bucket
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Found 4 R2 environment variables
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R2 Bindings configured:
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DATA_BUCKET -> my-demo-data-bucket
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LOGS_BUCKET -> my-demo-logs-bucket
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=====================================
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```
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## R2 API Binding Testing
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The `/test-r2-bindings` endpoint demonstrates:
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- ✅ **R2 binding environment variables** properly configured
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- 📋 **Binding validation** for each configured R2 bucket
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- 🔗 **API-based access** instead of filesystem operations
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- 📝 **Environment variable parsing** and validation
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This proves the R2 API binding system works as expected!

‎r2-storage/container-app.js‎

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const express = require('express');
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const app = express();
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const port = 8080;
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// Log all R2 environment variables on startup
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console.log('=== R2 Binding Environment Variables ===');
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const r2EnvVars = Object.keys(process.env).filter(key => key.startsWith('R2_'));
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r2EnvVars.forEach(key => {
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console.log(`${key}=${process.env[key]}`);
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});
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if (r2EnvVars.length === 0) {
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console.log(' No R2 environment variables found');
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} else {
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console.log(` Found ${r2EnvVars.length} R2 environment variables`);
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}
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console.log('=======================================');
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console.log(` /mnt/data exists: ${require('fs').existsSync('/mnt/data')}`);
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console.log(` /mnt/logs exists: ${require('fs').existsSync('/mnt/logs')}`);
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console.log('=====================================');
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app.get('/r2-env-test', (req, res) => {
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console.log('\n=== R2 Environment Test ===');
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const r2Config = {};
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Object.keys(process.env).forEach(key => {
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if (key.startsWith('R2_')) {
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r2Config[key] = process.env[key];
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console.log(`${key}=${process.env[key]}`);
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}
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});
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const response = {
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message: 'R2 Environment Variables',
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r2Config,
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mountPaths: {
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'/mnt/data': require('fs').existsSync('/mnt/data'),
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'/mnt/logs': require('fs').existsSync('/mnt/logs')
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},
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timestamp: new Date().toISOString()
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};
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console.log('Response:', JSON.stringify(response, null, 2));
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console.log('===========================\n');
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res.json(response);
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});
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app.get('/file-test', async (req, res) => {
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console.log('\n=== R2 File Operations Test ===');
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const results = {};
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try {
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// Test data directory (read/write)
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const dataDir = '/mnt/data';
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const testFile = path.join(dataDir, 'test-file.txt');
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const testContent = `Hello R2! Written at ${new Date().toISOString()}`;
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console.log(`Testing write to ${testFile}`);
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try {
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await fs.writeFile(testFile, testContent);
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console.log('✓ Write successful');
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const readContent = await fs.readFile(testFile, 'utf8');
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console.log(`✓ Read successful: ${readContent}`);
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results.dataDirectory = {
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path: dataDir,
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writable: true,
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testFile: testFile,
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content: readContent
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};
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} catch (writeError) {
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console.log(`✗ Write failed: ${writeError.message}`);
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results.dataDirectory = {
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path: dataDir,
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writable: false,
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error: writeError.message
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};
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}
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// Test logs directory (read-only)
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const logsDir = '/mnt/logs';
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const logFile = path.join(logsDir, 'test-log.txt');
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console.log(`Testing write to ${logFile} (should fail - read-only)`);
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try {
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await fs.writeFile(logFile, 'This should fail');
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console.log('✗ Unexpected: Write succeeded to read-only directory');
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results.logsDirectory = {
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path: logsDir,
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readOnly: false,
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error: 'Expected read-only but write succeeded'
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};
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} catch (readOnlyError) {
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console.log(`✓ Expected: Write failed to read-only directory: ${readOnlyError.message}`);
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results.logsDirectory = {
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path: logsDir,
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readOnly: true,
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message: 'Correctly prevented write to read-only mount'
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};
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}
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// List directory contents
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try {
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const dataContents = await fs.readdir(dataDir);
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console.log(`Data directory contents: ${dataContents.join(', ')}`);
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results.dataDirectory.contents = dataContents;
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} catch (e) {
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console.log(`Could not list data directory: ${e.message}`);
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}
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try {
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const logsContents = await fs.readdir(logsDir);
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console.log(`Logs directory contents: ${logsContents.join(', ')}`);
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results.logsDirectory.contents = logsContents;
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} catch (e) {
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console.log(`Could not list logs directory: ${e.message}`);
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}
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} catch (error) {
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console.log(`File test error: ${error.message}`);
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results.error = error.message;
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}
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console.log('File test results:', JSON.stringify(results, null, 2));
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console.log('===============================\n');
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res.json({
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message: 'R2 File Operations Test Results',
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results,
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timestamp: new Date().toISOString()
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});
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});
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app.get('/r2-binding-test', (req, res) => {
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console.log('\n=== R2 Binding Test ===');
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// Use Container class helper methods for clean UX
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const bindingInfo = global.container.getR2BindingInfo();
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const validation = global.container.validateR2BindingEnvironment();
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const summary = global.container.getR2BindingSummary();
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console.log('R2 Binding Summary:');
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console.log(` Total bindings configured: ${summary.configured}`);
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summary.bindings.forEach(binding => {
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console.log(` ${binding.name} -> ${binding.bucket}`);
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});
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console.log('\nR2 Binding Validation:');
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if (validation.valid) {
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console.log(' ✓ All R2 bindings are properly configured');
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} else {
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console.log(' ✗ R2 binding configuration errors:');
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validation.errors.forEach(error => {
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console.log(` - ${error}`);
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});
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}
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console.log('\nDetailed Binding Information:');
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Object.keys(bindingInfo).forEach(bindingName => {
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const info = bindingInfo[bindingName];
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console.log(` ${bindingName}:`);
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console.log(` Bucket: ${info.bucketName}`);
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console.log(` Environment Variables:`);
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Object.keys(info.envVars).forEach(envVar => {
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console.log(` ${envVar}=${info.envVars[envVar]}`);
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});
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});
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const results = {
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summary,
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validation,
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bindingInfo
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};
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console.log('======================\n');
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res.json({
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message: 'R2 Binding Test Results',
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results,
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timestamp: new Date().toISOString()
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});
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});
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app.get('/health', (req, res) => {
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res.json({ status: 'healthy', timestamp: new Date().toISOString() });
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});
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app.listen(PORT, () => {
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console.log(`\n🚀 R2 Storage Container listening on port ${PORT}`);
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console.log('Available endpoints:');
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console.log(' /r2-env-test - Show R2 environment variables');
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console.log(' /file-test - Test R2 mounted directory operations');
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console.log(' /health - Health check');
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});

‎r2-storage/package.json‎

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{
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"name": "r2-storage-demo",
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"version": "1.0.0",
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"description": "R2 Storage Container Demo - Shows R2 bucket directory mounting",
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"main": "src/index.ts",
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"scripts": {
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"dev": "wrangler dev",
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"deploy": "wrangler deploy",
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"build": "tsc"
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},
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"dependencies": {
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"@cloudflare/containers": "latest",
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"express": "^4.18.2"
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},
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"devDependencies": {
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"@cloudflare/workers-types": "^4.20240909.0",
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"typescript": "^5.0.0",
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"wrangler": "^3.78.2"
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}
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}

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