# Test Environment Service - Implementation Summary

**Date**: 2025-10-06
**Status**: ✅ Complete and Production Ready

---

## 🎯 What Was Built

A complete **containerized test environment service** integrated into the orchestrator, enabling automated testing of:
- Single taskservs
- Complete servers with multiple taskservs
- Multi-node cluster topologies (Kubernetes, etcd, etc.)

### Key Innovation
**No manual Docker management** - The orchestrator automatically handles:
- Container lifecycle
- Network isolation
- Resource limits
- Multi-node topologies
- Test execution
- Cleanup

---

## 📦 Implementation Details

### Rust Components (Orchestrator)

#### 1. **test_environment.rs** - Core Types
- Test environment types: Single/Server/Cluster
- Resource limits configuration
- Network configuration
- Container instances
- Test results tracking

#### 2. **container_manager.rs** - Docker Integration
- Docker API client (bollard)
- Container lifecycle management
- Network creation/isolation
- Image pulling
- Command execution
- Log collection

#### 3. **test_orchestrator.rs** - Orchestration
- Environment provisioning logic
- Single taskserv setup
- Server simulation
- Cluster topology deployment
- Test execution framework
- Cleanup automation

#### 4. **API Endpoints** (main.rs)
```
POST   /test/environments/create
GET    /test/environments
GET    /test/environments/{id}
POST   /test/environments/{id}/run
DELETE /test/environments/{id}
GET    /test/environments/{id}/logs
```

### Nushell Integration

#### 1. **test_environments.nu** - Core Commands
- `test env create` - Create from config
- `test env single` - Single taskserv test
- `test env server` - Server simulation
- `test env cluster` - Cluster topology
- `test env list/get/status` - Management
- `test env run` - Execute tests
- `test env logs` - View logs
- `test env cleanup` - Cleanup
- `test quick` - One-command test

#### 2. **test/mod.nu** - CLI Dispatcher
- Command routing
- Help system
- Integration with main CLI

#### 3. **CLI Integration**
- Added to main dispatcher
- Registry shortcuts: `test`, `tst`
- Full help documentation

### Configuration & Templates

#### 1. **test-topologies.toml** - Predefined Topologies
Templates included:
- `kubernetes_3node` - K8s HA cluster (1 CP + 2 workers)
- `kubernetes_single` - All-in-one K8s
- `etcd_cluster` - 3-member etcd cluster
- `containerd_test` - Standalone containerd
- `postgres_redis` - Database stack

#### 2. **Cargo.toml** - Dependencies
- Added `bollard = "0.17"` for Docker API

---

## 🚀 Usage Examples

### 1. Quick Test (Fastest)
```bash
provisioning test quick kubernetes
```

### 2. Single Taskserv
```bash
provisioning test env single postgres --auto-start --auto-cleanup
```

### 3. Server Simulation
```bash
provisioning test env server web-01 [containerd kubernetes cilium] --auto-start
```

### 4. Cluster from Template
```bash
provisioning test topology load kubernetes_3node | test env cluster kubernetes --auto-start
```

### 5. Custom Resources
```bash
provisioning test env single redis --cpu 4000 --memory 8192
```

### 6. List & Manage
```bash
# List environments
provisioning test env list

# Check status
provisioning test env status <env-id>

# View logs
provisioning test env logs <env-id>

# Cleanup
provisioning test env cleanup <env-id>
```

---

## 🔧 Architecture

```
User Command
    ↓
Nushell CLI (test_environments.nu)
    ↓
HTTP Request to Orchestrator (port 8080)
    ↓
Test Orchestrator (Rust)
    ↓
Container Manager (bollard)
    ↓
Docker API
    ↓
Isolated Containers with:
    • Dedicated network
    • Resource limits
    • Volume mounts
    • Multi-node support
```

---

## ✅ Features Delivered

### Core Capabilities
- ✅ Single taskserv testing
- ✅ Server simulation (multiple taskservs)
- ✅ Multi-node cluster topologies
- ✅ Automated network isolation
- ✅ Resource limits (CPU, memory)
- ✅ Auto-start and auto-cleanup
- ✅ Test execution framework
- ✅ Log collection
- ✅ REST API

### Advanced Features
- ✅ Topology templates
- ✅ Template loading system
- ✅ Custom configurations
- ✅ Parallel environment support
- ✅ Integration with existing orchestrator
- ✅ State management
- ✅ Error handling

### Developer Experience
- ✅ Simple CLI commands
- ✅ One-command quick tests
- ✅ Comprehensive help system
- ✅ JSON/YAML output support
- ✅ Detailed documentation
- ✅ CI/CD ready

---

## 📊 Comparison: Before vs After

### Before (Old test.nu)
- ❌ Manual Docker management
- ❌ Single container only
- ❌ No multi-node support
- ❌ No cluster simulation
- ❌ Manual cleanup required
- ❌ Limited to single taskserv

### After (New Test Environment Service)
- ✅ Automated container orchestration
- ✅ Single + Server + Cluster support
- ✅ Multi-node topologies
- ✅ Full cluster simulation (K8s, etcd, etc.)
- ✅ Auto-cleanup
- ✅ Complete infrastructure testing

---

## 📁 Files Created/Modified

### New Files (Rust)
```
provisioning/platform/orchestrator/src/
├── test_environment.rs         (280 lines)
├── container_manager.rs        (350 lines)
└── test_orchestrator.rs        (320 lines)
```

### New Files (Nushell)
```
provisioning/core/nulib/
├── test_environments.nu        (250 lines)
└── test/mod.nu                 (80 lines)
```

### New Files (Config)
```
provisioning/config/
└── test-topologies.toml        (150 lines)
```

### New Files (Docs)
```
docs/user/
├── test-environment-guide.md   (500 lines)
└── test_environments_summary.md (this file)
```

### Modified Files
```
provisioning/platform/orchestrator/
├── Cargo.toml                  (added bollard)
├── src/lib.rs                  (added modules)
└── src/main.rs                 (added API routes)

provisioning/core/nulib/main_provisioning/
└── dispatcher.nu               (added test handler)
```

---

## 🔍 Testing Scenarios Supported

### Development
- Test new taskservs before deployment
- Validate configurations
- Debug issues in isolation

### Integration
- Test taskserv combinations
- Validate dependencies
- Check compatibility

### Production-Like
- Simulate HA clusters
- Test failover scenarios
- Validate multi-node setups

### CI/CD
```yaml
# Example GitLab CI
test-infrastructure:
  script:
    - provisioning test quick kubernetes
    - provisioning test quick postgres
    - provisioning test quick redis
```

---

## 🎯 Use Cases Solved

1. **"Cómo probar un taskserv antes de desplegarlo?"**
   → `provisioning test quick <taskserv>`

2. **"Cómo simular un servidor completo con taskservs?"**
   → `provisioning test env server <name> [taskservs]`

3. **"Cómo probar un cluster multi-servidor como K8s?"**
   → `provisioning test topology load kubernetes_3node | test env cluster kubernetes`

4. **"Cómo automatizar tests en CI/CD?"**
   → REST API + CLI commands

5. **"No quiero gestionar Docker manualmente"**
   → Todo automatizado por el orchestrator

---

## 🚦 Prerequisites

1. **Docker running:**
   ```bash
   docker ps
   ```

2. **Orchestrator running:**
   ```bash
   cd provisioning/platform/orchestrator
   ./scripts/start-orchestrator.nu --background
   ```

---

## 📚 Documentation

- **User Guide**: `docs/user/test-environment-guide.md`
- **API Reference**: REST API endpoints documented
- **CLI Help**: `provisioning test help`
- **Topology Templates**: `provisioning/config/test-topologies.toml`

---

## 🎉 Success Metrics

- ✅ Complete containerized testing solution
- ✅ Zero manual Docker management
- ✅ Multi-node cluster support
- ✅ Production-ready implementation
- ✅ Comprehensive documentation
- ✅ CI/CD integration ready

---

## 🔄 Next Steps (Optional Enhancements)

Future improvements could include:
- Add more topology templates
- Advanced health checks
- Performance benchmarking
- Snapshot/restore capabilities
- Network policies testing
- Security scanning integration

---

**Status**: ✅ Complete and ready for production use