# Dolphin Userland Services

**Server-grade service management without root!** Uses `systemd --user` for reliability.

## 🚀 Quick Start

```bash
# Check status
./service_manager.py status

# Start all services
./service_manager.py start

# View logs
./service_manager.py logs exf -f
```

## 📋 Service Overview

| Service | File | Description | Interval |
|---------|------|-------------|----------|
| **exf** | `dolphin-exf.service` | External Factors (aggressive) | 0.5s |
| **ob** | `dolphin-ob.service` | Order Book Streamer | 500ms |
| **watchdog** | `dolphin-watchdog.service` | Survival Stack | 10s |
| **mc** | `dolphin-mc.timer` | MC-Forewarner | 4h |

## 🔧 Service Manager Commands

```bash
# Status
./service_manager.py status          # All services
./service_manager.py status exf      # Specific service

# Control
./service_manager.py start           # Start all
./service_manager.py stop            # Stop all
./service_manager.py restart exf     # Restart specific

# Logs
./service_manager.py logs exf        # Last 50 lines
./service_manager.py logs exf -f     # Follow
./service_manager.py logs exf -n 100 # Last 100 lines

# Auto-start on boot
./service_manager.py enable          # Enable all
./service_manager.py disable         # Disable all

# After editing .service files
./service_manager.py reload          # Reload systemd
```

## 🏗️ Creating a New Service

### Option 1: Full Service Base (Recommended)

```python
#!/usr/bin/env python3
from services.service_base import ServiceBase

class MyService(ServiceBase):
    def __init__(self):
        super().__init__(
            name='my-service',
            check_interval=30,
            max_retries=3,
            notify_systemd=True
        )
    
    async def run_cycle(self):
        # Your logic here
        await do_work()
        await asyncio.sleep(1)  # Cycle interval
    
    async def health_check(self) -> bool:
        # Optional: custom health check
        return True

if __name__ == '__main__':
    MyService().run()
```

Create systemd service file:
```bash
cat > ~/.config/systemd/user/dolphin-my.service << 'SERVICEFILE'
[Unit]
Description=My Service
After=network.target

[Service]
Type=notify
ExecStart=/usr/bin/python3 /path/to/my_service.py
Restart=always
RestartSec=5
StandardOutput=journal
StandardError=journal

[Install]
WantedBy=default.target
SERVICEFILE

# Enable and start
systemctl --user daemon-reload
systemctl --user enable dolphin-my.service
systemctl --user start dolphin-my.service
```

### Option 2: Simple Scheduled Task

```python
from services.service_base import run_scheduled

def my_task():
    print("Running...")

run_scheduled(my_task, interval_seconds=60, name='my-task')
```

## 📊 Features

### Automatic
- **Restart on crash**: Services auto-restart with backoff
- **Health checks**: Built-in monitoring
- **Structured logging**: JSON to systemd journal
- **Resource limits**: Memory/CPU quotas
- **Graceful shutdown**: SIGTERM handling

### Retry Logic (Tenacity)
```python
@ServiceBase.retry_with_backoff
async def fetch_data(self):
    # Automatically retries with exponential backoff
    pass
```

### Health Check Endpoint
Services expose health via Hazelcast or file:
```python
async def health_check(self) -> bool:
    return self.last_update > time.time() - 2.0
```

## 📝 Logging

All services log structured JSON:
```json
{
  "timestamp": "2024-03-25T15:30:00",
  "level": "INFO",
  "service": "exf",
  "message": "Indicators updated"
}
```

View logs:
```bash
# All services
journalctl --user -f

# Specific service
journalctl --user -u dolphin-exf -f
```

## 🔍 Monitoring

```bash
# Service status
systemctl --user status

# Resource usage
systemctl --user show dolphin-exf --property=MemoryCurrent,CPUUsageNSec

# Recent failures
systemctl --user --failed
```

## 🛠️ Troubleshooting

| Issue | Solution |
|-------|----------|
| Service won't start | Check `journalctl --user -u dolphin-exf` |
| High memory usage | Adjust `MemoryMax=` in .service file |
| Restart loop | Check exit code: `systemctl --user status exf` |
| Logs not showing | Ensure `StandardOutput=journal` |
| Permission denied | Service files must be in `~/.config/systemd/user/` |

## 🔄 Service Dependencies

```
exf -> hazelcast
ob  -> hazelcast, exf
watchdog -> hazelcast, exf, ob
mc -> hazelcast (timer-triggered)
```

Configured via `After=` and `Wants=` in service files.