# Work Summary: Event & Enforcement Query API Implementation

**Date:** 2024-01-13  
**Session Duration:** ~45 minutes  
**Status:** ✅ Complete

---

## Overview

Implemented complete REST API endpoints for querying events and enforcements in the Attune automation platform. These read-only endpoints enable monitoring of trigger firings (events) and rule activations (enforcements), which are fundamental to understanding and debugging automation workflows.

---

## What Was Accomplished

### 1. Created Event & Enforcement Data Transfer Objects (DTOs)

**File:** `crates/api/src/dto/event.rs`

**Event DTOs:**
- **EventResponse**: Full event details for single record retrieval
- **EventSummary**: Condensed view for list endpoints
- **EventQueryParams**: Query parameters with filtering and pagination

**Enforcement DTOs:**
- **EnforcementResponse**: Full enforcement details for single record retrieval
- **EnforcementSummary**: Condensed view for list endpoints
- **EnforcementQueryParams**: Query parameters with filtering and pagination

**Key Features:**
- Clean conversion from domain models to DTOs
- Proper serialization/deserialization
- Pagination support built-in

### 2. Implemented Event & Enforcement Query Routes

**File:** `crates/api/src/routes/events.rs`

Implemented 4 read-only query endpoints:

1. **GET /api/v1/events** - List all events with filtering
   - Filter by trigger ID or trigger reference
   - Filter by source ID
   - Paginated results

2. **GET /api/v1/events/:id** - Get specific event details
   - Returns full event with payload and configuration

3. **GET /api/v1/enforcements** - List all enforcements with filtering
   - Filter by rule ID, event ID, or status
   - Filter by trigger reference
   - Paginated results

4. **GET /api/v1/enforcements/:id** - Get specific enforcement details
   - Returns full enforcement with condition evaluation results

**Authentication:**
- All endpoints require JWT authentication via `RequireAuth` extractor
- Read-only operations (no create/update/delete)

### 3. Registered Routes

**Modified Files:**
- `crates/api/src/routes/mod.rs` - Added events module export
- `crates/api/src/server.rs` - Registered event routes in API router
- `crates/api/src/dto/mod.rs` - Exported event and enforcement DTOs

### 4. Created Comprehensive API Documentation

**File:** `docs/api-events-enforcements.md` (581 lines)

Complete documentation including:
- Event and Enforcement model specifications
- Status and condition enumerations
- Event flow diagram (Sensor → Event → Rule → Enforcement → Execution)
- Detailed endpoint documentation with:
  - Request/response examples
  - Query parameters
  - Error responses
  - Field descriptions
- Use case examples:
  - Monitoring event flow
  - Tracking rule activations
  - Debugging workflow issues
  - Auditing system activity
  - Event-to-execution tracing
- Best practices guide
- Performance considerations
- Error handling reference
- Future enhancement roadmap

### 5. Updated Project TODO

**File:** `work-summary/TODO.md`

- Marked Event & Enforcement Query API (section 2.9) as ✅ COMPLETE
- Updated "In Progress" section to reflect completion
- Listed all 4 implemented endpoints

### 6. Updated CHANGELOG

**File:** `CHANGELOG.md`

- Added Phase 2.9 entry with complete feature list
- Documented use cases and benefits

---

## Technical Details

### Key Implementation Decisions

1. **Read-Only API**: Intentionally designed as query-only endpoints since events and enforcements are system-generated (not user-created)

2. **Repository-Based Queries**: Leveraged existing repository methods:
   - `EventRepository::find_by_trigger()`, `find_by_trigger_ref()`
   - `EnforcementRepository::find_by_rule()`, `find_by_status()`, `find_by_event()`

3. **In-Memory Filtering**: Applied secondary filters (source, trigger_ref) in memory after database query for simplicity and flexibility

4. **Consistent Pagination**: Used project's standard `PaginationParams` pattern for consistency across all endpoints

5. **Summary vs Detail Views**: Created separate summary DTOs for list views to reduce payload size and improve performance

### Data Flow

```
Trigger Fires → Event Created
                    ↓
                Rule Evaluates Event
                    ↓
                Enforcement Created (if conditions match)
                    ↓
                Actions Scheduled → Executions
```

### Code Quality

- ✅ Follows established patterns from other route modules
- ✅ Proper error handling with descriptive messages
- ✅ Type-safe with proper Rust idioms
- ✅ Clean separation of concerns (DTOs, routes, repository layer)
- ✅ Comprehensive inline documentation
- ✅ Zero compile errors

### Testing Status

- ✅ Compiles successfully with no errors
- ⚠️ Only compiler warnings (unused imports in other modules - not related)
- ❌ No unit tests written yet (noted for future work)
- ❌ No integration tests written yet (noted for future work)

---

## Use Cases Enabled

### 1. Monitoring Automation Workflows

Users can now track the flow of events through the system:

```bash
# Monitor webhook events
curl -X GET "http://localhost:8080/api/v1/events?trigger_ref=core.webhook_received"

# Check which rules were triggered
curl -X GET "http://localhost:8080/api/v1/enforcements?event=123"
```

### 2. Debugging Rule Behavior

Developers can investigate why rules did or didn't fire:

```bash
# Find event
curl -X GET "http://localhost:8080/api/v1/events/123"

# Check enforcement creation
curl -X GET "http://localhost:8080/api/v1/enforcements?event=123"

# Examine condition evaluation
curl -X GET "http://localhost:8080/api/v1/enforcements/234"
```

### 3. System Auditing

Operators can audit automation activity:

```bash
# Check failed enforcements
curl -X GET "http://localhost:8080/api/v1/enforcements?status=failed"

# Monitor specific rule activity
curl -X GET "http://localhost:8080/api/v1/enforcements?rule=567"
```

### 4. Event-to-Execution Tracing

Full workflow tracing from trigger to execution:

```bash
# 1. Find event
GET /api/v1/events/123

# 2. Find enforcements
GET /api/v1/enforcements?event=123

# 3. Find executions (from Execution API)
GET /api/v1/executions?enforcement=234
```

---

## Issues Encountered & Resolved

### No Major Issues

This implementation was straightforward with no significant blockers. The repositories were already well-designed with appropriate query methods.

---

## Dependencies Used

- **axum**: Web framework for routing and handlers
- **serde**: Serialization/deserialization
- **sqlx**: Database queries (via repository layer)
- **chrono**: DateTime handling
- **attune_common**: Shared models and repository traits

---

## Next Steps

### Immediate (API Service Completion)

1. **Secret Management API** (Phase 2.10)
   - CRUD for keys/secrets
   - Proper encryption/decryption
   - Access control and auditing
   
2. **API Testing** (Phase 2.12)
   - Write integration tests for event/enforcement endpoints
   - Add unit tests for DTO conversions
   - Test pagination and filtering logic

3. **API Documentation** (Phase 2.11)
   - Add OpenAPI/Swagger specification
   - Generate interactive API docs
   - Create comprehensive usage examples

### After API Service

4. **Executor Service** (Phase 4)
   - Event consumption and rule evaluation
   - Enforcement creation
   - Execution scheduling

5. **Worker Service** (Phase 5)
   - Execute actions from enforcements
   - Runtime management

---

## Files Created/Modified

### Created
- `crates/api/src/dto/event.rs` (208 lines)
- `crates/api/src/routes/events.rs` (165 lines)
- `docs/api-events-enforcements.md` (581 lines)
- `work-summary/2024-01-13-event-enforcement-endpoints.md` (this file)

### Modified
- `crates/api/src/dto/mod.rs` - Added event exports
- `crates/api/src/routes/mod.rs` - Added events module
- `crates/api/src/server.rs` - Registered event routes
- `work-summary/TODO.md` - Marked Phase 2.9 complete
- `CHANGELOG.md` - Added Phase 2.9 entry

**Total Lines Added:** ~954 lines (code + documentation)

---

## Model Details

### Event Model Fields

| Field | Type | Purpose |
|-------|------|---------|
| `id` | i64 | Unique identifier |
| `trigger` | Option<i64> | Trigger that created this event |
| `trigger_ref` | String | Trigger reference (e.g., "core.webhook_received") |
| `config` | Option<JsonDict> | Configuration data |
| `payload` | Option<JsonDict> | Event payload from trigger source |
| `source` | Option<i64> | Sensor that created the event |
| `source_ref` | Option<String> | Sensor reference |
| `created` | DateTime<Utc> | Creation timestamp |
| `updated` | DateTime<Utc> | Last update timestamp |

### Enforcement Model Fields

| Field | Type | Purpose |
|-------|------|---------|
| `id` | i64 | Unique identifier |
| `rule` | Option<i64> | Rule that created this enforcement |
| `rule_ref` | String | Rule reference |
| `trigger_ref` | String | Trigger reference |
| `config` | Option<JsonDict> | Configuration data |
| `event` | Option<i64> | Event that triggered this enforcement |
| `status` | EnforcementStatus | Current status (pending, scheduled, running, completed, failed, cancelled) |
| `payload` | JsonDict | Data payload for enforcement |
| `condition` | EnforcementCondition | Overall condition result (passed, failed, skipped) |
| `conditions` | JsonValue | Detailed condition evaluation results |
| `created` | DateTime<Utc> | Creation timestamp |
| `updated` | DateTime<Utc> | Last update timestamp |

---

## Conclusion

Successfully implemented a complete, production-ready query API for monitoring events and enforcements in the Attune platform. The implementation follows established patterns, includes comprehensive documentation, and enables critical use cases for workflow monitoring, debugging, and auditing.

The event and enforcement query API now provides:
- ✅ Full visibility into trigger firings
- ✅ Rule activation tracking
- ✅ Status and condition monitoring
- ✅ Event-to-execution tracing
- ✅ Flexible filtering and pagination

**Phase 2.9 (Event & Enforcement Query API) is now complete!** 🎉

---

## Verification Commands

```bash
# Build API service
cargo build -p attune-api

# Check for errors
cargo check -p attune-api

# Run clippy for linting
cargo clippy -p attune-api

# Run tests (when implemented)
cargo test -p attune-api
```
