# Integration Status

**Date:** 2025-12-01
**Status:** LangChain Integration Pre-Structured, Ready for Implementation

---

## LangChain Integration

**Status:** ✅ Pre-Structured (Ready for Post-Release Implementation)

**Structure Created:**
```
src/llm_firewall/integrations/
├── __init__.py                          ✅ Created
├── langchain/
│   ├── __init__.py                      ✅ Created
│   ├── callbacks.py                     ✅ Created (FirewallCallbackHandler)
│   └── example_usage.py                 ✅ Created
examples/
└── langchain_integration.py             ✅ Created
```

**Implementation Status:**

- [x] Directory structure created
- [x] `FirewallCallbackHandler` class implemented
- [x] Input validation (on_llm_start)
- [x] Output validation (on_llm_end)
- [x] Violation handling (block/warn/sanitize)
- [x] Violation tracking and reporting
- [x] Error handling (fail-safe)
- [x] Example usage files
- [ ] Unit tests (to be added)
- [ ] Integration tests (to be added)
- [ ] Documentation updates (to be added)

**Optional Dependency Added:**
- `pyproject.toml` updated with `langchain` optional dependency

**Ready For:**
- ✅ Post-PyPI release implementation
- ✅ Testing with real LangChain chains
- ✅ Community feedback

---

## Next Steps (Post-Release)

1. **Install LangChain:**
   ```bash
   pip install langchain
   ```

2. **Test Implementation:**
   ```bash
   python examples/langchain_integration.py
   ```

3. **Add Tests:**
   - Unit tests for `FirewallCallbackHandler`
   - Integration tests with LangChain chains

4. **Update Documentation:**
   - Add LangChain section to README
   - Update QUICKSTART.md (already done)

5. **Announce:**
   - LangChain Discord
   - Reddit r/LangChain
   - Twitter/X

---

## Future Integrations

### OpenAI Integration (Planned)

**Goal:** Direct OpenAI wrapper with built-in firewall

```python
from llm_firewall.integrations.openai import OpenAIFirewall

client = OpenAIFirewall(api_key="...")
response = client.chat.completions.create(...)  # Auto-validated
```

**Status:** Not yet implemented

---

## Testing Requirements

### LangChain Integration Tests Needed

1. **Unit Tests:**
   - `test_firewall_callback_handler_init`
   - `test_callback_blocks_malicious_input`
   - `test_callback_allows_safe_input`
   - `test_violation_tracking`
   - `test_warn_mode`
   - `test_sanitize_mode`

2. **Integration Tests:**
   - `test_langchain_chain_with_firewall`
   - `test_conversational_chain`
   - `test_agent_with_firewall`
   - `test_error_handling`

**Location:** `tests/integrations/test_langchain.py` (to be created)

---

**Status:** ✅ Ready for Post-Release Implementation
**Estimated Time:** 2-3 hours (testing + documentation)
