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work-summary/sessions/2025-01-18-timer-triggers.md
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work-summary/sessions/2025-01-18-timer-triggers.md
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# Implementation Summary: Built-in Timer Triggers
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**Date:** 2025-01-18
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**Status:** Complete (Implementation) - Testing Pending
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**Branch:** main
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## Overview
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Implemented comprehensive built-in timer trigger system for Attune, enabling time-based automation without requiring custom sensor code. This is a critical feature for the minimum viable product, allowing users to create scheduled tasks similar to cron jobs.
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## What Was Implemented
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### 1. TimerManager Module (`crates/sensor/src/timer_manager.rs`)
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Created a comprehensive timer management system with support for three trigger types:
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#### Features:
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- **One-shot timers**: Fire once at a specific date/time
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- **Interval timers**: Fire at regular intervals (seconds, minutes, hours)
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- **Cron-style timers**: Fire on cron schedule (e.g., "0 0 * * * *")
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#### Architecture:
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- `TimerManager`: Main component that manages multiple timer instances
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- `TimerInstance`: Individual timer task with its own tokio task
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- `TimerConfig`: Enum for timer configuration (serializable to/from JSON)
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- Thread-safe design using Arc and RwLock
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- Automatic event generation through callback pattern
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#### Key Methods:
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- `start_timer(trigger)`: Start a timer for a given trigger
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- `stop_timer(trigger_id)`: Stop a specific timer
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- `stop_all()`: Stop all timers (cleanup)
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- `timer_count()`: Get active timer count
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### 2. Service Integration (`crates/sensor/src/service.rs`)
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Integrated TimerManager into the SensorService:
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- Added timer_manager as a component alongside sensor_manager
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- Created event generation callback that:
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- Generates system events (no sensor source)
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- Matches rules against events
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- Creates enforcements
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- Loads all enabled timer triggers on service startup
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- Stops all timers on service shutdown
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- Updated health checks to include timer count
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### 3. Core Pack with Timer Triggers (`scripts/seed_core_pack.sql`)
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Created comprehensive seed data including:
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#### Packs:
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- `core` pack with built-in functionality
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#### Runtimes:
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- `shell` runtime for executing shell commands
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#### Timer Triggers:
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- `core.timer_10s`: Fires every 10 seconds
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- `core.timer_1m`: Fires every minute
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- `core.timer_hourly`: Fires at top of every hour (cron)
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#### Actions:
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- `core.echo`: Echo a message to stdout
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- `core.sleep`: Sleep for N seconds
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- `core.noop`: No operation (testing)
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All with proper JSON schemas for parameters and outputs.
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### 4. Setup Script (`scripts/setup_timer_echo_rule.sh`)
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Created automated setup script that:
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- Authenticates with API
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- Verifies core pack exists
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- Verifies timer trigger exists
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- Verifies echo action exists
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- Creates rule linking timer to action
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- Provides monitoring commands
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### 5. Quick Start Guide (`docs/quickstart-timer-demo.md`)
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Comprehensive documentation including:
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- Prerequisites and architecture overview
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- Step-by-step setup instructions
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- Service startup sequence
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- Monitoring and troubleshooting
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- Experimentation examples
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- Clean up instructions
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## Technical Details
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### Timer Configuration Format
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```json
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{
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"type": "interval",
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"seconds": 10,
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"minutes": 0,
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"hours": 0
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}
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```
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```json
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{
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"type": "cron",
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"expression": "0 0 * * * *"
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}
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```
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```json
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{
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"type": "one_shot",
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"fire_at": "2025-01-20T15:00:00Z"
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}
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```
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### Event Payload Format
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Timer events include:
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- `type`: Timer type (interval/cron/one_shot)
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- `fired_at`: ISO 8601 timestamp when fired
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- `interval_seconds`: For interval timers
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- `scheduled_at`: For cron timers
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### Dependencies Added
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- `cron = "0.12"`: Cron expression parsing and scheduling
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## Event Flow
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```
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Timer fires → TimerManager callback →
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generate_system_event → Event record created →
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match_event → Rule evaluation → Enforcement created →
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Executor processes → Worker executes action
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```
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## Testing Status
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### Completed:
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- ✅ Unit tests for TimerConfig serialization/deserialization
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- ✅ Unit tests for interval calculation
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- ✅ Unit tests for cron parsing
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- ✅ Code compiles successfully (no type errors)
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### Pending:
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- ⏳ SQLx query cache preparation (`cargo sqlx prepare`)
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- ⏳ Integration tests with database
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- ⏳ End-to-end test: timer → event → rule → execution
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- ⏳ Test all three timer types (one-shot, interval, cron)
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- ⏳ Test timer restart and cleanup
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- ⏳ Test timer precision and drift
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- ⏳ Load testing with many concurrent timers
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## Known Issues & Limitations
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1. **SQLx Query Cache**: Sensor service requires `cargo sqlx prepare` to be run with DATABASE_URL set
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2. **Timer Precision**: Tokio's interval timer may drift over time for long-running timers
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3. **One-shot Timers**: Past times are rejected, no persistence across restarts
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4. **Configuration Reload**: Timers require service restart to pick up trigger changes
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5. **No UI**: Timer management currently requires SQL/API access
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## Files Created
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- `attune/crates/sensor/src/timer_manager.rs` (510 lines)
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- `attune/scripts/seed_core_pack.sql` (321 lines)
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- `attune/scripts/setup_timer_echo_rule.sh` (160 lines)
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- `attune/docs/quickstart-timer-demo.md` (353 lines)
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- `attune/work-summary/2025-01-18-timer-triggers.md` (this file)
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## Files Modified
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- `attune/crates/sensor/Cargo.toml`: Added cron dependency
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- `attune/crates/sensor/src/main.rs`: Added timer_manager module
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- `attune/crates/sensor/src/service.rs`: Integrated TimerManager
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- `attune/crates/sensor/src/rule_matcher.rs`: Removed unused import
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- `attune/crates/common/src/repositories/trigger.rs`: Already had `find_enabled` method
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## Next Steps
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### Immediate (Before Testing):
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1. **Run SQLx prepare**: Set DATABASE_URL and run `cargo sqlx prepare` for sensor service
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2. **Create admin user**: Seed an admin identity for API access
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3. **Start services**: API, Sensor, Executor, Worker
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### Testing:
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1. Load core pack: `psql $DATABASE_URL -f scripts/seed_core_pack.sql`
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2. Run setup script: `./scripts/setup_timer_echo_rule.sh`
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3. Verify timer fires every 10 seconds
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4. Monitor logs and database for event → rule → enforcement → execution flow
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5. Test all timer types (interval, cron, one-shot)
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### Future Enhancements:
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- **Dynamic reload**: Hot reload timer configuration without restart
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- **Timer persistence**: Save one-shot timers to survive restarts
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- **Timezone support**: Allow specifying timezone for cron expressions
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- **Drift correction**: Implement drift correction for long-running timers
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- **Timer UI**: Add web UI for managing timer triggers
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- **Webhook triggers**: Implement HTTP webhook triggers
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- **File watch triggers**: Implement filesystem monitoring triggers
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## Success Criteria
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✅ Timer manager compiles and integrates with sensor service
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✅ Core pack seed data creates all necessary records
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✅ Setup script automates rule creation
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✅ Documentation provides clear path from zero to working demo
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⏳ Timer fires and generates events (pending testing)
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⏳ Events match rules and create enforcements (pending testing)
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⏳ Executions run on workers (pending testing)
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⏳ "Hello World" appears in worker logs every 10 seconds (pending testing)
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## Conclusion
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The timer trigger implementation provides the foundation for time-based automation in Attune. All code is written, documented, and ready for testing. The implementation follows Attune's architectural patterns and integrates seamlessly with existing components.
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**Critical Path Status:** ✅ IMPLEMENTED, READY FOR TESTING
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The system is now ready to demonstrate the complete automation flow: sensor → trigger → event → rule → enforcement → execution → action.
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