# ogn-python

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A database backend for the [Open Glider Network](http://wiki.glidernet.org/).
The ogn-python module saves all received beacons into a database with [SQLAlchemy](http://www.sqlalchemy.org/).
It connects to the OGN aprs servers with [python-ogn-client](https://github.com/glidernet/python-ogn-client).
It requires [PostgreSQL](http://www.postgresql.org/) and [PostGIS](http://www.postgis.net/).
For best performance you should use [TimescaleDB](https://www.timescale.com), which is based on PostgreSQL.

[Examples](https://github.com/glidernet/ogn-python/wiki/Examples)


## Installation and Setup
1. Checkout the repository

    ```
    git clone https://github.com/glidernet/ogn-python.git
    ```

2. Install python requirements

    ```
    pip install -r requirements.txt
    ```

3. Install [PostgreSQL](http://www.postgresql.org/) with [PostGIS](http://www.postgis.net/) Extension.
    Create a database (use "ogn" as default, otherwise you have to modify the configuration, see below)

4.  Optional: Install redis for asynchronous tasks (like takeoff/landing-detection)

    ```
    apt-get install redis-server
    ```

5. Create database

    ```
    ./manage.py db.init
    ```

6. Optional: Prepare tables for TimescaleDB

    ```
    ./manage.py db.init_timescaledb
    ```

7. Optional: Import world border dataset (needed if you want to know the country a receiver belongs to, etc.)
    Get the [World Borders Dataset](http://thematicmapping.org/downloads/world_borders.php) and unpack it.
    Then import it into your database (we use "ogn" as database name).
    
    ```
    shp2pgsql -s 4326 TM_WORLD_BORDERS-0.3.shp world_borders_temp | psql -d ogn
    psql -d ogn -c "INSERT INTO countries SELECT * FROM world_borders_temp;"
    psql -d ogn -c "DROP TABLE world_borders_temp;"
    ```
    
8. Optional: Import world elevation data (needed for AGL calculation)
    For Europe we can get the DEM as GeoTIFF files from the
    [European Environment Agency](https://land.copernicus.eu/imagery-in-situ/eu-dem/eu-dem-v1.1).
    Because the spatial reference system (SRID) of these files is 3035 and we want 4326 we have to convert them:
    
    ```
    gdalwarp -s_srs "EPSG:3035" -t_srs "EPSG:4326" source.tif target.tif
    ```
    
    Then we can import the GeoTIFF into the elevation table:
    
    ```
    raster2pgsql -c -C -I -M -t 100x100 elevation_data.tif public.elevation | psql -d ogn
    ```
    
There is also a [Vagrant](https://www.vagrantup.com/) environment for the development of ogn-python.
You can create and start this virtual machine with `vagrant up` and login with `vagrant ssh`.
The code of ogn-python will be available in the shared folder `/vagrant`.

## Usage
### Running the aprs client and task server
To schedule tasks like takeoff/landing-detection (`logbook.compute`),
[Celery](http://www.celeryproject.org/) with [Redis](http://www.redis.io/) is used.
The following scripts run in the foreground and should be deamonized
(eg. use [supervisord](http://supervisord.org/)).

- Start the aprs client

  ```
  ./manage.py gateway.run
  ```

- Start a task server (make sure redis is up and running)

  ```
  celery -A ogn.collect worker -l info
  ```

- Start the task scheduler (make sure a task server is up and running)

  ```
  celery -A ogn.collect beat -l info
  ```


To load a custom configuration, create a file `myconfig.py` (see [config/default.py](config/default.py))
and set the environment variable `OGN_CONFIG_MODULE` accordingly.

```
touch myconfig.py
export OGN_CONFIG_MODULE="myconfig"
./manage.py gateway.run
```

### manage.py - CLI options
```
usage: manage [<namespace>.]<command> [<args>]

positional arguments:
  command     the command to run

optional arguments:
  -h, --help  show this help message and exit

available commands:
  
  [bulkimport]
    create_flights2d       Create complete flight traces from logfile tables.
    create_gaps2d          Create 'gaps' from logfile tables.
    file_export            Export separate logfile tables to csv files. They can be used for fast bulk import with sql COPY command.
    file_import            Import APRS logfiles into separate logfile tables.
    transfer               Transfer beacons from separate logfile tables to beacon table.
    update                 Update beacons (add foreign keys, compute distance, bearing, ags, etc.) in separate logfile tables.
  
  [db]
    drop                   Drop all tables.
    import_airports        Import airports from a ".cup" file
    import_ddb             Import registered devices from the DDB.
    import_file            Import registered devices from a local file.
    import_flarmnet        Import registered devices from a local file.
    init                   Initialize the database.
    init_timescaledb       Initialize TimescaleDB features.
    update_country_codes   Update country codes of all receivers.
    upgrade                Upgrade database to the latest version.
  
  [flights]
    flights2d              Compute flights.
  
  [gateway]
    run                    Run the aprs client.
  
  [export]
    cup                    Export receiver waypoints as '.cup'.
    igc                    Export igc file for <address> at <date>.
  
  [logbook]
    compute_logbook        Compute logbook.
    compute_takeoff_landingCompute takeoffs and landings.
    show                   Show a logbook for <airport_name>.
  
  [stats]
    create                 Create DeviceStats, ReceiverStats and RelationStats.
    create_ognrange        Create stats for Melissa's ognrange.
    update_devices         Update devices with data from stats.
    update_receivers       Update receivers with data from stats.
```

Only the command `logbook.compute` requires a running task server (celery) at the moment.


### Available tasks

- `ogn.collect.database.import_ddb` - Import registered devices from the DDB.
- `ogn.collect.database.import_file` - Import registered devices from a local file.
- `ogn.collect.database.update_country_code` - Update country code in receivers table if None.
- `ogn.collect.database.update_devices` - Add/update entries in devices table and update foreign keys in aircraft beacons.
- `ogn.collect.database.update_receivers` - Add/update_receivers entries in receiver table and update receivers foreign keys and distance in aircraft beacons and update foreign keys in receiver beacons.
- `ogn.collect.logbook.update_logbook` - Add/update logbook entries.
- `ogn.collect.logbook.update_max_altitude` - Add max altitudes in logbook when flight is complete (takeoff and landing).
- `ogn.collect.stats.update_device_stats` - Add/update entries in device stats table.
- `ogn.collect.stats.update_receiver_stats` - Add/update entries in receiver stats table.
- `ogn.collect.takeoff_landing.update_takeoff_landing` - Compute takeoffs and landings.

If the task server is up and running, tasks could be started manually.

```
python3
>>>from ogn.collect.database import import_ddb
>>>import_ddb.delay()
```

## License
Licensed under the [AGPLv3](LICENSE).