# Bidirectional HTTP Clients - Complete File Manifest

## New Files Created (13)

### Client Implementations
1. **`/backend/internal/clients/python_client.go`**
   - Go HTTP client for calling Python backend
   - Features: Retry, circuit breaker, caching, service token auth
   - ~180 lines of code

2. **`/src/tracertm/clients/go_client.py`**
   - Python async HTTP client for calling Go backend
   - Features: Connection pooling, retry, service token auth
   - ~220 lines of code

### Integration Tests
3. **`/backend/tests/integration/clients/python_integration_test.go`**
   - Go integration tests for Python client
   - 7 comprehensive test cases
   - ~280 lines of code

4. **`/backend/tests/integration/clients/go.mod`**
   - Go module file for integration tests
   - Module replacement for local development

5. **`/tests/integration/clients/__init__.py`**
   - Python package marker for integration tests

6. **`/tests/integration/clients/test_go_integration.py`**
   - Python integration tests for Go client
   - 14 comprehensive test cases
   - ~330 lines of code

### Configuration & Environment
7. **`/.env.integration`**
   - Integration testing environment configuration
   - Backend URLs, service tokens, feature flags

### Documentation
8. **`/backend/BIDIRECTIONAL_HTTP_CLIENTS.md`**
   - Comprehensive implementation guide
   - Architecture diagrams, usage examples, troubleshooting
   - ~600 lines of documentation

9. **`/BIDIRECTIONAL_CLIENTS_QUICK_START.md`**
   - Quick start guide with code examples
   - Common operations, troubleshooting, pro tips
   - ~300 lines of documentation

10. **`/BIDIRECTIONAL_CLIENTS_IMPLEMENTATION_SUMMARY.md`**
    - Detailed implementation summary
    - Success criteria, file manifest, testing instructions
    - ~400 lines of documentation

11. **`/IMPLEMENTATION_COMPLETE.md`**
    - High-level completion summary
    - Quick reference for implementation status

### Testing & Automation
12. **`/scripts/test_bidirectional_clients.sh`**
    - Automated verification script
    - Tests file existence, compilation, dependencies, integration
    - ~200 lines of bash

## Modified Files (5)

### Backend Infrastructure
1. **`/backend/internal/infrastructure/infrastructure.go`**
   - **Added**: Import for `clients` package
   - **Added**: `PythonClient *clients.PythonServiceClient` field to Infrastructure struct
   - **Added**: Python client initialization in `InitializeInfrastructure()`
   - **Lines changed**: ~15 lines added

### Backend Configuration
2. **`/backend/internal/config/config.go`**
   - **Added**: `PythonBackendURL string` field to Config struct
   - **Added**: `ServiceToken string` field to Config struct
   - **Added**: Environment variable loading for both fields
   - **Lines changed**: ~5 lines added

### Python API
3. **`/src/tracertm/api/main.py`**
   - **Added**: Go client import in startup event
   - **Added**: Go client initialization with app state
   - **Added**: Go client cleanup in shutdown event
   - **Lines changed**: ~20 lines added

### Python Dependencies
4. **`/pyproject.toml`**
   - **Added**: `"tenacity>=8.2.0"` to dependencies list
   - **Lines changed**: 1 line added

### Backend Environment Example
5. **`/backend/.env.example`**
   - **Added**: Cross-backend communication section
   - **Added**: GO_BACKEND_URL, PYTHON_BACKEND_URL, SERVICE_TOKEN variables
   - **Lines changed**: ~8 lines added

## Go Dependencies Added (2)

1. `github.com/hashicorp/go-retryablehttp v0.7.5`
   - HTTP client with automatic retry logic
   - Exponential backoff support

2. `github.com/sony/gobreaker v0.5.0`
   - Circuit breaker pattern implementation
   - Configurable failure thresholds

## Python Dependencies Added (1)

1. `tenacity>=8.2.0`
   - Retry library with decorators
   - Exponential backoff support

## File Statistics

**Total Files**: 18 (13 new, 5 modified)

**Lines of Code**:
- Go Client: ~180 lines
- Python Client: ~220 lines
- Go Tests: ~280 lines
- Python Tests: ~330 lines
- Documentation: ~1,300 lines
- Configuration: ~30 lines
- **Total**: ~2,340 lines

## Directory Structure

```
trace/
├── backend/
│   ├── internal/
│   │   ├── clients/
│   │   │   └── python_client.go                    [NEW]
│   │   ├── config/
│   │   │   └── config.go                           [MODIFIED]
│   │   └── infrastructure/
│   │       └── infrastructure.go                   [MODIFIED]
│   ├── tests/
│   │   └── integration/
│   │       └── clients/
│   │           ├── python_integration_test.go      [NEW]
│   │           └── go.mod                          [NEW]
│   ├── .env.example                                [MODIFIED]
│   └── BIDIRECTIONAL_HTTP_CLIENTS.md               [NEW]
│
├── src/tracertm/
│   ├── api/
│   │   └── main.py                                 [MODIFIED]
│   └── clients/
│       └── go_client.py                            [NEW]
│
├── tests/integration/clients/
│   ├── __init__.py                                 [NEW]
│   └── test_go_integration.py                      [NEW]
│
├── scripts/
│   └── test_bidirectional_clients.sh               [NEW]
│
├── .env.integration                                [NEW]
├── pyproject.toml                                  [MODIFIED]
├── BIDIRECTIONAL_CLIENTS_QUICK_START.md            [NEW]
├── BIDIRECTIONAL_CLIENTS_IMPLEMENTATION_SUMMARY.md [NEW]
├── BIDIRECTIONAL_CLIENTS_FILE_MANIFEST.md          [NEW]
└── IMPLEMENTATION_COMPLETE.md                      [NEW]
```

## Testing Coverage

### Go Integration Tests (7 tests)
1. TestPythonServiceClient_SuccessfulRequest
2. TestPythonServiceClient_CacheHit
3. TestPythonServiceClient_CircuitBreakerTrips
4. TestPythonServiceClient_RetryLogic
5. TestPythonServiceClient_RequestTimeout
6. TestGenerateCacheKey
7. TestPythonServiceClient_ConnectionPooling

### Python Integration Tests (14 tests)
1. test_go_client_health_check
2. test_go_client_get_item
3. test_go_client_create_link
4. test_go_client_search_items
5. test_go_client_retry_logic
6. test_go_client_connection_pooling
7. test_go_client_service_token_injection
8. test_go_client_error_handling
9. test_go_client_timeout
10. test_go_client_context_manager
11. test_generate_cache_key
12. test_go_client_concurrent_requests
13. test_go_client_update_item
14. test_go_client_delete_item

## Documentation Structure

1. **Implementation Guide** (`BIDIRECTIONAL_HTTP_CLIENTS.md`)
   - Architecture overview
   - Feature descriptions
   - Usage examples
   - Integration patterns
   - Performance metrics
   - Troubleshooting guide

2. **Quick Start** (`BIDIRECTIONAL_CLIENTS_QUICK_START.md`)
   - Environment setup
   - Basic usage examples
   - Common operations
   - Troubleshooting tips

3. **Implementation Summary** (`BIDIRECTIONAL_CLIENTS_IMPLEMENTATION_SUMMARY.md`)
   - Success criteria validation
   - File manifest
   - Testing instructions
   - Production checklist

4. **File Manifest** (This file)
   - Complete file listing
   - Modification details
   - Directory structure
   - Testing coverage

## Verification

Run the automated verification script:
```bash
bash scripts/test_bidirectional_clients.sh
```

This will verify:
- ✅ All files exist
- ✅ Code compiles successfully
- ✅ Dependencies are installed
- ✅ Configuration is correct
- ✅ Integration tests pass
