feat: Sprint 4 - Azure Blob Storage and Google Cloud Storage support

Implemented full native support for Azure Blob Storage and Google Cloud Storage: **Azure Blob Storage (internal/cloud/azure.go):** - Native Azure SDK integration (github.com/Azure/azure-sdk-for-go) - Block blob upload for large files (>256MB with 100MB blocks) - Azurite emulator support for local testing - Production Azure authentication (account name + key) - SHA-256 integrity verification with metadata - Streaming uploads with progress tracking **Google Cloud Storage (internal/cloud/gcs.go):** - Native GCS SDK integration (cloud.google.com/go/storage) - Chunked upload for large files (16MB chunks) - fake-gcs-server emulator support for local testing - Application Default Credentials support - Service account JSON key file support - SHA-256 integrity verification with metadata - Streaming uploads with progress tracking **Backend Integration:** - Updated NewBackend() factory to support azure/azblob and gs/gcs providers - Added Name() methods to both backends - Fixed ProgressReader usage across all backends - Updated Config comments to document Azure/GCS support **Testing Infrastructure:** - docker-compose.azurite.yml: Azurite + PostgreSQL + MySQL test environment - docker-compose.gcs.yml: fake-gcs-server + PostgreSQL + MySQL test environment - scripts/test_azure_storage.sh: 8 comprehensive Azure integration tests - scripts/test_gcs_storage.sh: 8 comprehensive GCS integration tests - Both test scripts validate upload/download/verify/cleanup/restore operations **Documentation:** - AZURE.md: Complete guide (600+ lines) covering setup, authentication, usage - GCS.md: Complete guide (600+ lines) covering setup, authentication, usage - Updated CLOUD.md with Azure and GCS sections - Updated internal/config/config.go with Azure/GCS field documentation **Test Coverage:** - Large file uploads (300MB for Azure, 200MB for GCS) - Block/chunked upload verification - Backup verification with SHA-256 checksums - Restore from cloud URIs - Cleanup and retention policies - Emulator support for both providers **Dependencies Added:** - Azure: github.com/Azure/azure-sdk-for-go/sdk/storage/azblob v1.6.3 - GCS: cloud.google.com/go/storage v1.57.2 - Plus transitive dependencies (~50+ packages) **Build:** - Compiles successfully: 68MB binary - All imports resolved - No compilation errors Sprint 4 closes the multi-cloud gap identified in Sprint 3 evaluation. Users can now use Azure and GCS URIs that were previously parsed but unsupported.
2025-11-25 21:31:21 +00:00
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+# Azure Blob Storage Integration
+
+This guide covers using **Azure Blob Storage** with `dbbackup` for secure, scalable cloud backup storage.
+
+## Table of Contents
+
+- [Quick Start](#quick-start)
+- [URI Syntax](#uri-syntax)
+- [Authentication](#authentication)
+- [Configuration](#configuration)
+- [Usage Examples](#usage-examples)
+- [Advanced Features](#advanced-features)
+- [Testing with Azurite](#testing-with-azurite)
+- [Best Practices](#best-practices)
+- [Troubleshooting](#troubleshooting)
+
+## Quick Start
+
+### 1. Azure Portal Setup
+
+1. Create a storage account in Azure Portal
+2. Create a container for backups
+3. Get your account credentials:
+   - **Account Name**: Your storage account name
+   - **Account Key**: Primary or secondary access key (from Access Keys section)
+
+### 2. Basic Backup
+
+```bash
+# Backup PostgreSQL to Azure
+dbbackup backup postgres \
+  --host localhost \
+  --database mydb \
+  --output backup.sql \
+  --cloud "azure://mycontainer/backups/db.sql?account=myaccount&key=ACCOUNT_KEY"
+```
+
+### 3. Restore from Azure
+
+```bash
+# Restore from Azure backup
+dbbackup restore postgres \
+  --source "azure://mycontainer/backups/db.sql?account=myaccount&key=ACCOUNT_KEY" \
+  --host localhost \
+  --database mydb_restored
+```
+
+## URI Syntax
+
+### Basic Format
+
+```
+azure://container/path/to/backup.sql?account=ACCOUNT_NAME&key=ACCOUNT_KEY
+```
+
+### URI Components
+
+| Component | Required | Description | Example |
+|-----------|----------|-------------|---------|
+| `container` | Yes | Azure container name | `mycontainer` |
+| `path` | Yes | Object path within container | `backups/db.sql` |
+| `account` | Yes | Storage account name | `mystorageaccount` |
+| `key` | Yes | Storage account key | `base64-encoded-key` |
+| `endpoint` | No | Custom endpoint (Azurite) | `http://localhost:10000` |
+
+### URI Examples
+
+**Production Azure:**
+```
+azure://prod-backups/postgres/db.sql?account=prodaccount&key=YOUR_KEY_HERE
+```
+
+**Azurite Emulator:**
+```
+azure://test-backups/postgres/db.sql?endpoint=http://localhost:10000&account=devstoreaccount1&key=Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw==
+```
+
+**With Path Prefix:**
+```
+azure://backups/production/postgres/2024/db.sql?account=myaccount&key=KEY
+```
+
+## Authentication
+
+### Method 1: URI Parameters (Recommended for CLI)
+
+Pass credentials directly in the URI:
+
+```bash
+azure://container/path?account=myaccount&key=YOUR_ACCOUNT_KEY
+```
+
+### Method 2: Environment Variables
+
+Set credentials via environment:
+
+```bash
+export AZURE_STORAGE_ACCOUNT="myaccount"
+export AZURE_STORAGE_KEY="YOUR_ACCOUNT_KEY"
+
+# Use simplified URI (credentials from environment)
+dbbackup backup postgres --cloud "azure://container/path/backup.sql"
+```
+
+### Method 3: Connection String
+
+Use Azure connection string:
+
+```bash
+export AZURE_STORAGE_CONNECTION_STRING="DefaultEndpointsProtocol=https;AccountName=myaccount;AccountKey=YOUR_KEY;EndpointSuffix=core.windows.net"
+
+dbbackup backup postgres --cloud "azure://container/path/backup.sql"
+```
+
+### Getting Your Account Key
+
+1. Go to Azure Portal → Storage Accounts
+2. Select your storage account
+3. Navigate to **Security + networking** → **Access keys**
+4. Copy **key1** or **key2**
+
+**Important:** Keep your account keys secure. Use Azure Key Vault for production.
+
+## Configuration
+
+### Container Setup
+
+Create a container before first use:
+
+```bash
+# Azure CLI
+az storage container create \
+  --name backups \
+  --account-name myaccount \
+  --account-key YOUR_KEY
+
+# Or let dbbackup create it automatically
+dbbackup cloud upload file.sql "azure://backups/file.sql?account=myaccount&key=KEY&create=true"
+```
+
+### Access Tiers
+
+Azure Blob Storage offers multiple access tiers:
+
+- **Hot**: Frequent access (default)
+- **Cool**: Infrequent access (lower storage cost)
+- **Archive**: Long-term retention (lowest cost, retrieval delay)
+
+Set the tier in Azure Portal or using Azure CLI:
+
+```bash
+az storage blob set-tier \
+  --container-name backups \
+  --name backup.sql \
+  --tier Cool \
+  --account-name myaccount
+```
+
+### Lifecycle Management
+
+Configure automatic tier transitions:
+
+```json
+{
+  "rules": [
+    {
+      "name": "moveToArchive",
+      "type": "Lifecycle",
+      "definition": {
+        "filters": {
+          "blobTypes": ["blockBlob"],
+          "prefixMatch": ["backups/"]
+        },
+        "actions": {
+          "baseBlob": {
+            "tierToCool": {
+              "daysAfterModificationGreaterThan": 30
+            },
+            "tierToArchive": {
+              "daysAfterModificationGreaterThan": 90
+            },
+            "delete": {
+              "daysAfterModificationGreaterThan": 365
+            }
+          }
+        }
+      }
+    }
+  ]
+}
+```
+
+## Usage Examples
+
+### Backup with Auto-Upload
+
+```bash
+# PostgreSQL backup with automatic Azure upload
+dbbackup backup postgres \
+  --host localhost \
+  --database production_db \
+  --output /backups/db.sql \
+  --cloud "azure://prod-backups/postgres/$(date +%Y%m%d_%H%M%S).sql?account=myaccount&key=KEY" \
+  --compression 6
+```
+
+### Backup All Databases
+
+```bash
+# Backup entire PostgreSQL cluster to Azure
+dbbackup backup postgres \
+  --host localhost \
+  --all-databases \
+  --output-dir /backups \
+  --cloud "azure://prod-backups/postgres/cluster/?account=myaccount&key=KEY"
+```
+
+### Verify Backup
+
+```bash
+# Verify backup integrity
+dbbackup verify "azure://prod-backups/postgres/backup.sql?account=myaccount&key=KEY"
+```
+
+### List Backups
+
+```bash
+# List all backups in container
+dbbackup cloud list "azure://prod-backups/postgres/?account=myaccount&key=KEY"
+
+# List with pattern
+dbbackup cloud list "azure://prod-backups/postgres/2024/?account=myaccount&key=KEY"
+```
+
+### Download Backup
+
+```bash
+# Download from Azure to local
+dbbackup cloud download \
+  "azure://prod-backups/postgres/backup.sql?account=myaccount&key=KEY" \
+  /local/path/backup.sql
+```
+
+### Delete Old Backups
+
+```bash
+# Manual delete
+dbbackup cloud delete "azure://prod-backups/postgres/old_backup.sql?account=myaccount&key=KEY"
+
+# Automatic cleanup (keep last 7 backups)
+dbbackup cleanup "azure://prod-backups/postgres/?account=myaccount&key=KEY" --keep 7
+```
+
+### Scheduled Backups
+
+```bash
+#!/bin/bash
+# Azure backup script (run via cron)
+
+DATE=$(date +%Y%m%d_%H%M%S)
+AZURE_URI="azure://prod-backups/postgres/${DATE}.sql?account=myaccount&key=${AZURE_STORAGE_KEY}"
+
+dbbackup backup postgres \
+  --host localhost \
+  --database production_db \
+  --output /tmp/backup.sql \
+  --cloud "${AZURE_URI}" \
+  --compression 9
+
+# Cleanup old backups
+dbbackup cleanup "azure://prod-backups/postgres/?account=myaccount&key=${AZURE_STORAGE_KEY}" --keep 30
+```
+
+**Crontab:**
+```cron
+# Daily at 2 AM
+0 2 * * * /usr/local/bin/azure-backup.sh >> /var/log/azure-backup.log 2>&1
+```
+
+## Advanced Features
+
+### Block Blob Upload
+
+For large files (>256MB), dbbackup automatically uses Azure Block Blob staging:
+
+- **Block Size**: 100MB per block
+- **Parallel Upload**: Multiple blocks uploaded concurrently
+- **Checksum**: SHA-256 integrity verification
+
+```bash
+# Large database backup (automatically uses block blob)
+dbbackup backup postgres \
+  --host localhost \
+  --database huge_db \
+  --output /backups/huge.sql \
+  --cloud "azure://backups/huge.sql?account=myaccount&key=KEY"
+```
+
+### Progress Tracking
+
+```bash
+# Backup with progress display
+dbbackup backup postgres \
+  --host localhost \
+  --database mydb \
+  --output backup.sql \
+  --cloud "azure://backups/backup.sql?account=myaccount&key=KEY" \
+  --progress
+```
+
+### Concurrent Operations
+
+```bash
+# Backup multiple databases in parallel
+dbbackup backup postgres \
+  --host localhost \
+  --all-databases \
+  --output-dir /backups \
+  --cloud "azure://backups/cluster/?account=myaccount&key=KEY" \
+  --parallelism 4
+```
+
+### Custom Metadata
+
+Backups include SHA-256 checksums as blob metadata:
+
+```bash
+# Verify metadata using Azure CLI
+az storage blob metadata show \
+  --container-name backups \
+  --name backup.sql \
+  --account-name myaccount
+```
+
+## Testing with Azurite
+
+### Setup Azurite Emulator
+
+**Docker Compose:**
+```yaml
+services:
+  azurite:
+    image: mcr.microsoft.com/azure-storage/azurite:latest
+    ports:
+      - "10000:10000"
+      - "10001:10001"
+      - "10002:10002"
+    command: azurite --blobHost 0.0.0.0 --loose
+```
+
+**Start:**
+```bash
+docker-compose -f docker-compose.azurite.yml up -d
+```
+
+### Default Azurite Credentials
+
+```
+Account Name: devstoreaccount1
+Account Key: Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw==
+Endpoint: http://localhost:10000/devstoreaccount1
+```
+
+### Test Backup
+
+```bash
+# Backup to Azurite
+dbbackup backup postgres \
+  --host localhost \
+  --database testdb \
+  --output test.sql \
+  --cloud "azure://test-backups/test.sql?endpoint=http://localhost:10000&account=devstoreaccount1&key=Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw=="
+```
+
+### Run Integration Tests
+
+```bash
+# Run comprehensive test suite
+./scripts/test_azure_storage.sh
+```
+
+Tests include:
+- PostgreSQL and MySQL backups
+- Upload/download operations
+- Large file handling (300MB+)
+- Verification and cleanup
+- Restore operations
+
+## Best Practices
+
+### 1. Security
+
+- **Never commit credentials** to version control
+- Use **Azure Key Vault** for production keys
+- Rotate account keys regularly
+- Use **Shared Access Signatures (SAS)** for limited access
+- Enable **Azure AD authentication** when possible
+
+### 2. Performance
+
+- Use **compression** for faster uploads: `--compression 6`
+- Enable **parallelism** for cluster backups: `--parallelism 4`
+- Choose appropriate **Azure region** (close to source)
+- Use **Premium Storage** for high throughput
+
+### 3. Cost Optimization
+
+- Use **Cool tier** for backups older than 30 days
+- Use **Archive tier** for long-term retention (>90 days)
+- Enable **lifecycle management** for automatic transitions
+- Monitor storage costs in Azure Cost Management
+
+### 4. Reliability
+
+- Test **restore procedures** regularly
+- Use **retention policies**: `--keep 30`
+- Enable **soft delete** in Azure (30-day recovery)
+- Monitor backup success with Azure Monitor
+
+### 5. Organization
+
+- Use **consistent naming**: `{database}/{date}/{backup}.sql`
+- Use **container prefixes**: `prod-backups`, `dev-backups`
+- Tag backups with **metadata** (version, environment)
+- Document restore procedures
+
+## Troubleshooting
+
+### Connection Issues
+
+**Problem:** `failed to create Azure client`
+
+**Solutions:**
+- Verify account name is correct
+- Check account key (copy from Azure Portal)
+- Ensure endpoint is accessible (firewall rules)
+- For Azurite, confirm `http://localhost:10000` is running
+
+### Authentication Errors
+
+**Problem:** `authentication failed`
+
+**Solutions:**
+- Check for spaces/special characters in key
+- Verify account key hasn't been rotated
+- Try using connection string method
+- Check Azure firewall rules (allow your IP)
+
+### Upload Failures
+
+**Problem:** `failed to upload blob`
+
+**Solutions:**
+- Check container exists (or use `&create=true`)
+- Verify sufficient storage quota
+- Check network connectivity
+- Try smaller files first (test connection)
+
+### Large File Issues
+
+**Problem:** Upload timeout for large files
+
+**Solutions:**
+- dbbackup automatically uses block blob for files >256MB
+- Increase compression: `--compression 9`
+- Check network bandwidth
+- Use Azure Premium Storage for better throughput
+
+### List/Download Issues
+
+**Problem:** `blob not found`
+
+**Solutions:**
+- Verify blob name (check Azure Portal)
+- Check container name is correct
+- Ensure blob hasn't been moved/deleted
+- Check if blob is in Archive tier (requires rehydration)
+
+### Performance Issues
+
+**Problem:** Slow upload/download
+
+**Solutions:**
+- Use compression: `--compression 6`
+- Choose closer Azure region
+- Check network bandwidth
+- Use Azure Premium Storage
+- Enable parallelism for multiple files
+
+### Debugging
+
+Enable debug mode:
+
+```bash
+dbbackup backup postgres \
+  --cloud "azure://container/backup.sql?account=myaccount&key=KEY" \
+  --debug
+```
+
+Check Azure logs:
+
+```bash
+# Azure CLI
+az monitor activity-log list \
+  --resource-group mygroup \
+  --namespace Microsoft.Storage
+```
+
+## Additional Resources
+
+- [Azure Blob Storage Documentation](https://docs.microsoft.com/azure/storage/blobs/)
+- [Azurite Emulator](https://github.com/Azure/Azurite)
+- [Azure Storage Explorer](https://azure.microsoft.com/features/storage-explorer/)
+- [Azure CLI](https://docs.microsoft.com/cli/azure/storage)
+- [dbbackup Cloud Storage Guide](CLOUD.md)
+
+## Support
+
+For issues specific to Azure integration:
+
+1. Check [Troubleshooting](#troubleshooting) section
+2. Run integration tests: `./scripts/test_azure_storage.sh`
+3. Enable debug mode: `--debug`
+4. Check Azure Service Health
+5. Open an issue on GitHub with debug logs
+
+## See Also
+
+- [Google Cloud Storage Guide](GCS.md)
+- [AWS S3 Guide](CLOUD.md#aws-s3)
+- [Main Cloud Storage Documentation](CLOUD.md)