# Plugin Data Sources

Learn how to configure different data sources for your plugin.

## Overview

Data sources determine **where the plugin gets its data** and **what format it returns**. NetAlertX supports multiple data source types, each suited for different use cases.

| Data Source | Type | Purpose | Returns | Example |
|-------------|------|---------|---------|---------|
| `script` | Code Execution | Execute Linux commands or Python scripts | Pipeline | Scan network, collect metrics, call APIs |
| `app-db-query` | Database Query | Query the NetAlertX database | Result set | Show devices, open ports, recent events |
| `sqlite-db-query` | External DB | Query external SQLite databases | Result set | PiHole database, external logs |
| `template` | Template | Generate values from templates | Values | Initialize default settings |

## Data Source: `script`

Execute any Linux command or Python script and capture its output.

### Configuration

```json
{
  "data_source": "script",
  "show_ui": true,
  "mapped_to_table": "CurrentScan"
}
```

### How It Works

1. Command specified in `CMD` setting is executed
2. Script writes results to `/tmp/log/plugins/last_result.<PREFIX>.log`
3. Core reads file and parses pipe-delimited results
4. Results inserted into database

### Example: Simple Python Script

```json
{
  "function": "CMD",
  "type": {"dataType": "string", "elements": [{"elementType": "input", "elementOptions": [], "transformers": []}]},
  "default_value": "python3 /app/front/plugins/my_plugin/script.py",
  "localized": ["name"],
  "name": [{"language_code": "en_us", "string": "Command"}]
}
```

### Example: Bash Script

```json
{
  "function": "CMD",
  "default_value": "bash /app/front/plugins/my_plugin/script.sh",
  "localized": ["name"],
  "name": [{"language_code": "en_us", "string": "Command"}]
}
```

### Best Practices

- **Always use absolute paths** (e.g., `/app/front/plugins/...`)
- **Use `plugin_helper.py`** for output formatting
- **Add timeouts** via `RUN_TIMEOUT` setting (default: 60s)
- **Log errors** to `/tmp/log/plugins/<PREFIX>.log`
- **Handle missing dependencies gracefully**

### Output Format

Must write to: `/tmp/log/plugins/last_result.<PREFIX>.log`

Format: Pipe-delimited, 9 or 13 columns

See [Plugin Data Contract](PLUGINS_DEV_DATA_CONTRACT.md) for exact format

---

## Data Source: `app-db-query`

Query the NetAlertX SQLite database and display results.

### Configuration

```json
{
  "data_source": "app-db-query",
  "show_ui": true,
  "mapped_to_table": "CurrentScan"
}
```

### How It Works

1. SQL query specified in `CMD` setting is executed against `app.db`
2. Results parsed according to column definitions
3. Inserted into plugin display/database

### SQL Query Requirements

- Must return exactly **9 or 13 columns** matching the [data contract](PLUGINS_DEV_DATA_CONTRACT.md)
- Column names must match (order matters!)
- Must be **readable SQLite SQL** (not vendor-specific)

### Example: Open Ports from Nmap

```json
{
  "function": "CMD",
  "type": {"dataType": "string", "elements": [{"elementType": "input", "elementOptions": [], "transformers": []}]},
  "default_value": "SELECT dv.devName as Object_PrimaryID, cast(dv.devLastIP as VARCHAR(100)) || ':' || cast(SUBSTR(ns.Port, 0, INSTR(ns.Port, '/')) as VARCHAR(100)) as Object_SecondaryID, datetime() as DateTime, ns.Service as Watched_Value1, ns.State as Watched_Value2, null as Watched_Value3, null as Watched_Value4, ns.Extra as Extra, dv.devMac as ForeignKey FROM (SELECT * FROM Nmap_Scan) ns LEFT JOIN (SELECT devName, devMac, devLastIP FROM Devices) dv ON ns.MAC = dv.devMac",
  "localized": ["name"],
  "name": [{"language_code": "en_us", "string": "SQL to run"}],
  "description": [{"language_code": "en_us", "string": "This SQL query populates the plugin table"}]
}
```

### Example: Recent Device Events

```sql
SELECT
  e.EventValue as Object_PrimaryID,
  d.devName as Object_SecondaryID,
  e.EventDateTime as DateTime,
  e.EventType as Watched_Value1,
  d.devLastIP as Watched_Value2,
  null as Watched_Value3,
  null as Watched_Value4,
  e.EventDetails as Extra,
  d.devMac as ForeignKey
FROM
  Events e
LEFT JOIN
  Devices d ON e.DeviceMac = d.devMac
WHERE
  e.EventDateTime > datetime('now', '-24 hours')
ORDER BY
  e.EventDateTime DESC
```

See the [Database documentation](./DATABASE.md) for a list of common columns.

---

## Data Source: `sqlite-db-query`

Query an **external SQLite database** mounted in the container.

### Configuration

First, define the database path in a setting:

```json
{
  "function": "DB_PATH",
  "type": {"dataType": "string", "elements": [{"elementType": "input", "elementOptions": [], "transformers": []}]},
  "default_value": "/etc/pihole/pihole-FTL.db",
  "localized": ["name"],
  "name": [{"language_code": "en_us", "string": "Database path"}],
  "description": [{"language_code": "en_us", "string": "Path to external SQLite database"}]
}
```

Then set data source and query:

```json
{
  "data_source": "sqlite-db-query",
  "show_ui": true
}
```

### How It Works

1. External database file path specified in `DB_PATH` setting
2. Database mounted at that path (e.g., via Docker volume)
3. SQL query executed against external database using `EXTERNAL_<PREFIX>.` prefix
4. Results returned in standard format

### SQL Query Example: PiHole Data

```json
{
  "function": "CMD",
  "default_value": "SELECT hwaddr as Object_PrimaryID, cast('http://' || (SELECT ip FROM EXTERNAL_PIHOLE.network_addresses WHERE network_id = id ORDER BY lastseen DESC LIMIT 1) as VARCHAR(100)) || ':' || cast(SUBSTR((SELECT name FROM EXTERNAL_PIHOLE.network_addresses WHERE network_id = id ORDER BY lastseen DESC LIMIT 1), 0, INSTR((SELECT name FROM EXTERNAL_PIHOLE.network_addresses WHERE network_id = id ORDER BY lastseen DESC LIMIT 1), '/')) as VARCHAR(100)) as Object_SecondaryID, datetime() as DateTime, macVendor as Watched_Value1, lastQuery as Watched_Value2, (SELECT name FROM EXTERNAL_PIHOLE.network_addresses WHERE network_id = id ORDER BY lastseen DESC LIMIT 1) as Watched_Value3, null as Watched_Value4, '' as Extra, hwaddr as ForeignKey FROM EXTERNAL_PIHOLE.network WHERE hwaddr NOT LIKE 'ip-%' AND hwaddr <> '00:00:00:00:00:00'",
  "localized": ["name"],
  "name": [{"language_code": "en_us", "string": "SQL to run"}]
}
```

### Key Points

- **Prefix all external tables** with `EXTERNAL_<PREFIX>.`
  - For PiHole (`PIHOLE` prefix): `EXTERNAL_PIHOLE.network`
  - For custom database (`CUSTOM` prefix): `EXTERNAL_CUSTOM.my_table`
- **Database must be valid SQLite**
- **Path must be accessible** inside the container
- **No columns beyond the data contract** required

### Docker Volume Setup

To mount external database in docker-compose:

```yaml
services:
  netalertx:
    volumes:
      - /path/on/host/pihole-FTL.db:/etc/pihole/pihole-FTL.db:ro
```

---

## Data Source: `template`

Generate values from a template. Usually used for initialization and default settings.

### Configuration

```json
{
  "data_source": "template"
}
```

### How It Works

- **Not widely used** in standard plugins
- Used internally for generating default values
- Check `newdev_template` plugin for implementation example

### Example: Default Device Template

```json
{
  "function": "DEFAULT_DEVICE_PROPERTIES",
  "type": {"dataType": "string", "elements": [{"elementType": "textarea", "elementOptions": [], "transformers": []}]},
  "default_value": "type=Unknown|vendor=Unknown",
  "localized": ["name"],
  "name": [{"language_code": "en_us", "string": "Default properties"}]
}
```

---

## Data Source: `plugin_type`

Declare the plugin category. Controls where settings appear in the UI.

### Configuration

```json
{
  "data_source": "plugin_type",
  "value": "scanner"
}
```

### Supported Values

| Value | Section | Purpose |
|-------|---------|---------|
| `scanner` | Device Scanners | Discovers devices on network |
| `system` | System Plugins | Core system functionality |
| `publisher` | Notification/Alert Plugins | Sends notifications/alerts |
| `importer` | Data Importers | Imports devices from external sources |
| `other` | Other Plugins | Miscellaneous functionality |

### Example

```json
{
  "settings": [
    {
      "function": "plugin_type",
      "type": {"dataType": "string", "elements": []},
      "default_value": "scanner",
      "options": ["scanner"],
      "data_source": "plugin_type",
      "value": "scanner",
      "localized": []
    }
  ]
}
```

---

## Execution Order

Control plugin execution priority. Higher priority plugins run first.

```json
{
  "execution_order": "Layer_0"
}
```

### Levels (highest to lowest priority)

- `Layer_0` - Highest priority (run first)
- `Layer_1`
- `Layer_2`
- ...

### Example: Device Discovery


```json
{
  "code_name": "device_scanner",
  "unique_prefix": "DEVSCAN",
  "execution_order": "Layer_0",
  "data_source": "script",
  "mapped_to_table": "CurrentScan"
}
```

---

## Performance Considerations

### Script Source
- **Pros:** Flexible, can call external tools
- **Cons:** Slower than database queries
- **Optimization:** Add caching, use timeouts
- **Default timeout:** 60 seconds (set `RUN_TIMEOUT`)

### Database Query Source
- **Pros:** Fast, native query optimization
- **Cons:** Limited to SQL capabilities
- **Optimization:** Use indexes, avoid complex joins
- **Timeout:** Usually instant

### External DB Query Source
- **Pros:** Direct access to external data
- **Cons:** Network latency, external availability
- **Optimization:** Use indexes in external DB, selective queries
- **Timeout:** Depends on DB response time

---

## Debugging Data Sources

### Check Script Output

```bash
# Run script manually
python3 /app/front/plugins/my_plugin/script.py

# Check result file
cat /tmp/log/plugins/last_result.MYPREFIX.log
```

### Test SQL Query

```bash
# Connect to app database
sqlite3 /data/db/app.db

# Run query
sqlite> SELECT ... ;
```

### Monitor Execution

```bash
# Watch backend logs
tail -f /tmp/log/stdout.log | grep -i "data_source\|MYPREFIX"
```

---

## See Also

- [Plugin Data Contract](PLUGINS_DEV_DATA_CONTRACT.md) - Output format specification
- [Plugin Settings System](PLUGINS_DEV_SETTINGS.md) - How to define settings
- [Quick Start Guide](PLUGINS_DEV_QUICK_START.md) - Create your first plugin
- [Database Schema](DATABASE.md) - Available tables and columns
- [Debugging Plugins](DEBUG_PLUGINS.md) - Troubleshooting data issues