# Cloud Infrastructure Feature - Implementation Summary

## Overview

This implementation provides the foundation for automated cloud infrastructure provisioning using Pulumi's Go SDK, enabling users to spin up ephemeral worker nodes across multiple cloud providers for distributed scanning.

## What Was Implemented

### ✅ Phase 1: Foundation (COMPLETED)

#### 1. Package Structure
Created `/internal/cloud/` with the following files:
- `config.go` - Cloud config loading, validation, and environment variable resolution
- `provider.go` - Provider interface and type definitions
- `pulumi.go` - Pulumi Automation API wrapper
- `lifecycle.go` - Orchestration logic (create → run → collect → destroy)
- `cost.go` - Cost tracking and limit enforcement
- `state.go` - Infrastructure state persistence (JSON format)
- `worker.go` - Worker registration waiting and filtering
- `registry.go` - Provider factory and registration
- `digitalocean.go` - DigitalOcean provider implementation (foundation)

#### 2. Configuration System
- **Extended `/internal/config/config.go`**:
  - Added `CloudConfig` struct to main `Config`
  - Added cloud section to embedded YAML template

- **Created `/internal/config/cloud_config.go`**:
  - `CloudConfigs` struct matching YAML schema
  - Provider configs (AWS, GCP, DigitalOcean, Linode, Azure)
  - Defaults, Limits, State, SSH, Setup sections
  - `DefaultCloudConfigs()` factory function

- **Environment Variable Resolution**:
  - Supports `${VAR_NAME}` syntax in config values
  - Automatically expands on load

#### 3. CLI Commands
Created `/pkg/cli/cloud.go` with full command tree:
```
osmedeus cloud
├── config
│   ├── set <key> <value>     # Update cloud-settings.yaml
│   └── show                   # Display current config
├── create                     # Provision infrastructure
├── list                       # List active resources
├── destroy [id]              # Teardown infrastructure
└── run                        # Create + run workflow + destroy
```

**Flags**:
- `--provider` - Override default provider
- `--mode` - vm or serverless
- `--instances` - Number of instances
- `--force` - Force rebuild

**Registered** in `/pkg/cli/root.go` (line 309)

#### 4. Dependencies
Added to `go.mod`:
- `github.com/pulumi/pulumi/sdk/v3` (v3.220.0)
- `github.com/pulumi/pulumi-digitalocean/sdk/v4` (v4.57.0)
- `github.com/digitalocean/godo` (v1.175.0)

#### 5. Core Abstractions

**Provider Interface**:
```go
type Provider interface {
    Validate(ctx) error
    EstimateCost(mode, count) (*CostEstimate, error)
    CreateInfrastructure(ctx, opts) (*Infrastructure, error)
    DestroyInfrastructure(ctx, infra) error
    GetStatus(ctx, infra) (*InfraStatus, error)
    Type() ProviderType
}
```

**Key Types**:
- `ProviderType`: aws, gcp, digitalocean, linode, azure
- `ExecutionMode`: vm (Phase 1), serverless (Phase 2)
- `Infrastructure`: Resources, Pulumi stack ID, metadata
- `Resource`: VM/function details, IPs, worker ID, status
- `CostEstimate`: Hourly/daily rates, breakdown, notes

**LifecycleManager**:
- Cost validation before provisioning
- Worker registration waiting (polls every 5s)
- Graceful shutdown on SIGINT/SIGTERM
- Cleanup on failure (configurable)

**CostTracker**:
- Real-time cost calculation based on elapsed time
- Limit enforcement (max_hourly_spend, max_total_spend)
- Summary formatting for display

**State Management**:
- JSON persistence in `{{base_folder}}/cloud-state/infrastructure/`
- `SaveInfrastructureState()` / `LoadInfrastructureState()`
- `ListInfrastructures()` for `cloud list` command
- Recovery from interruptions

**Worker Integration**:
- `WaitForWorkers()` polls `distributed.Client.GetAllWorkers()`
- Filters by `wosm-` or `cloud-` prefix
- Timeout handling (default 5min)
- Status callback support

#### 6. DigitalOcean Provider (Foundation)
- **Provider struct**: Token, region, size, snapshot, SSH keys, godo client
- **Validation**: Tests API access via account info
- **Cost estimation**: Pricing map for common droplet sizes
- **Cloud-init script**: Installs osmedeus, sets up SSH, joins as worker
- **Pulumi integration**: Placeholder for `digitalocean.Droplet` resources

## What's NOT Yet Implemented

### ⏳ Phase 2: Completion Tasks

1. **DigitalOcean Droplet Creation**
   - Complete `createDropletProgram()` with actual Pulumi resources
   - SSH key creation/upload
   - Firewall rules
   - Output extraction (IPs, droplet IDs)
   - Status monitoring

2. **Result Collection**
   - SSH rsync integration from `internal/runner`
   - Workspace aggregation on master
   - Optional database import via `db_import_*` functions

3. **Cloud Run Workflow**
   - Full lifecycle: create → wait → submit tasks → monitor → collect → destroy
   - Distributed task submission via `distributed.Master`
   - Progress UI via `terminal.Printer`
   - Cost monitoring ticker

4. **Error Handling**
   - Robust retry logic
   - Partial failure handling
   - Resource leak prevention
   - Better error messages

5. **Additional Providers**
   - AWS EC2 implementation
   - GCP Compute Engine implementation
   - Linode implementation
   - Azure implementation

6. **Image Building**
   - `cloud build` command to create provider images/snapshots
   - Packer integration or provider-native tools
   - Pre-baked osmedeus images for faster boot

7. **Testing**
   - Unit tests for config, cost, state
   - Integration tests (requires cloud credentials)
   - End-to-end test script
   - Cost limit validation tests

8. **Documentation**
   - Usage examples in CLAUDE.md
   - API documentation
   - Troubleshooting guide

## Testing the Current Implementation

### Build Test
```bash
make fmt && make build
# ✅ Compiles successfully (152MB binary)
```

### CLI Test
```bash
./bin/osmedeus cloud --help
# ✅ Shows cloud command help

./bin/osmedeus cloud config --help
# ✅ Shows config subcommands

./bin/osmedeus cloud create --help
# ✅ Shows create flags
```

### Config Test
```bash
# Set a config value
osmedeus cloud config set defaults.provider digitalocean
osmedeus cloud config set providers.digitalocean.token ${DIGITALOCEAN_TOKEN}

# Show current config
osmedeus cloud config show
```

## Architecture Decisions

1. **Local Pulumi State**: No Pulumi Cloud account required, state stored in `{{base_folder}}/cloud-state/`
2. **Provider in Same Package**: Moved from `cloud/providers/` to `cloud/` to avoid import cycles
3. **Worker Auto-Registration**: Leverages existing `distributed.Worker` system, no custom registration needed
4. **State Persistence**: JSON format for easy inspection and debugging
5. **Cost Tracking**: Proactive limits prevent accidental overspending
6. **Graceful Shutdown**: Signal handlers ensure cleanup even on interruption

## Next Steps for Full Implementation

### Priority 1: Complete DigitalOcean Provider
1. Implement full Pulumi program in `createDropletProgram()`
2. Add SSH key management
3. Extract outputs (IPs, IDs) from Pulumi stack
4. Test single-instance creation end-to-end

### Priority 2: Implement Cloud Run Workflow
1. Add distributed task submission logic
2. Integrate cost monitoring ticker
3. Add confirmation prompts
4. Test full lifecycle with simple workflow

### Priority 3: Result Collection
1. Integrate SSH runner's `CopyFromRemote()`
2. Aggregate results to master workspace
3. Optional: Auto-import to master database

### Priority 4: Error Handling & Polish
1. Add retry logic for API failures
2. Better error messages
3. Progress indicators
4. Confirmation prompts

## Files Modified

### Created
- `/internal/cloud/*.go` (9 files)
- `/internal/config/cloud_config.go`
- `/pkg/cli/cloud.go`
- `/internal/cloud/README.md` (this file)

### Modified
- `/internal/config/config.go` (added CloudConfig struct + YAML template)
- `/pkg/cli/root.go` (registered cloudCmd)
- `go.mod` (added Pulumi + DigitalOcean dependencies)

## Summary

The cloud infrastructure feature foundation is **complete and compiles successfully**. The architecture is sound, the CLI is functional, and the abstractions are clean. The remaining work is primarily:
1. Completing the DigitalOcean Pulumi program
2. Implementing the cloud run workflow orchestration
3. Adding result collection via SSH
4. Testing end-to-end with real cloud resources

The implementation follows Osmedeus patterns (Cobra CLI, YAML config, terminal printer) and integrates seamlessly with the existing distributed system.