*** Backup Mirror *** The web interface and JSON api for the ConnectedHumber Air Quality Monitoring Project. https://github.com/ConnectedHumber/Air-Quality-Web
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<?php
namespace AirQuality\Repositories;
use \AirQuality\Repositories\MariaDBMeasurementDataRepository;
use Location\Coordinate;
use Location\Distance\Vincenty;
/**
* Fetches device info from a MariaDB database.
*/
class MariaDBDeviceRepository implements IDeviceRepository {
public static $table_name = "devices";
public static $column_device_id = "device_id";
public static $column_device_name = "device_name";
public static $column_device_type = "device_type";
public static $column_owner_id = "owner_id";
public static $column_lat = "device_latitude";
public static $column_long = "device_longitude";
public static $column_point = "lat_lon";
public static $column_altitude = "device_altitude";
public static $column_last_seen = "last_seen";
public static $column_visible = "visible";
public static $table_name_type = "device_types";
public static $column_type_id = "device_type";
public static $column_type_processor = "processor";
public static $column_type_connection = "Connection";
public static $column_type_particle_sensor = "particle_sensor";
public static $column_type_temp_sensor = "temp_sensor";
public static $column_type_power = "power";
public static $column_type_software = "Software";
public static $column_type_notes = "Other";
// ------------------------------------------------------------------------
/**
* The database connection.
* @var \AirQuality\Database
*/
private $database;
/**
* The distance calculator. From the mjaschen/phpgeo library on packagist.
* @var Vincenty
*/
private $distance_calculator;
/**
* Function that gets a static variable by it's name. Useful in preparing SQL queries.
* @var callable
*/
private $get_static;
/**
* Function that gets a static variable by it's name & class. Useful in preparing SQL queries.
* @var callable
*/
private $get_static_extra;
function __construct(\AirQuality\Database $in_database, Vincenty $in_distance_calculator) {
$this->database = $in_database;
$this->distance_calculator = $in_distance_calculator;
$this->get_static = function($name) { return self::$$name; };
$this->get_static_extra = function($class_name, $name) {
return $class_name::$$name;
};
}
public function get_all_devices($only_with_location) {
$s = $this->get_static;
$o = $this->get_static_extra;
$data_repo_class = MariaDBMeasurementDataRepository::class;
$data_repo_table_meta = $o($data_repo_class, "table_name_metadata");
$data_repo_col_datetime = "$data_repo_table_meta.{$o($data_repo_class, "column_metadata_datetime")}";
$data_repo_col_device_id = "$data_repo_table_meta.{$o($data_repo_class, "column_metadata_device_id")}";
$sql = "SELECT
{$s("table_name")}.{$s("column_device_id")} AS id,
{$s("table_name")}.{$s("column_device_name")} AS name,
{$s("table_name")}.{$s("column_lat")} AS latitude,
{$s("table_name")}.{$s("column_long")} AS longitude,
{$s("table_name")}.{$s("column_altitude")} AS altitude,
{$s("table_name")}.{$s("column_device_type")} AS type_id,
{$s("table_name")}.{$s("column_last_seen")} AS last_seen
FROM {$s("table_name")}
JOIN $data_repo_table_meta ON
$data_repo_col_device_id = {$s("table_name")}.{$s("column_device_id")}
WHERE {$s("table_name")}.{$s("column_visible")} != 0";
if($only_with_location)
$sql .= "\nAND
{$s("column_lat")} IS NOT NULL
AND {$s("column_long")} IS NOT NULL";
$sql .= "
GROUP BY $data_repo_col_device_id;";
return $this->database->query($sql)->fetchAll();
}
public function get_device_info_ext($device_id) {
$s = $this->get_static;
$o = $this->get_static_extra;
$data_repo_class = MariaDBMeasurementDataRepository::class;
$data_repo_table_meta = $o($data_repo_class, "table_name_metadata");
$data_repo_col_datetime = "$data_repo_table_meta.{$o($data_repo_class, "column_metadata_datetime")}";
$data_repo_col_device_id = "$data_repo_table_meta.{$o($data_repo_class, "column_metadata_device_id")}";
$query_result = $this->database->query(
"SELECT
{$s("table_name")}.{$s("column_device_id")} AS id,
{$s("table_name")}.{$s("column_device_name")} AS name,
{$s("table_name")}.{$s("column_lat")} AS latitude,
{$s("table_name")}.{$s("column_long")} AS longitude,
{$s("table_name")}.{$s("column_altitude")} AS altitude,
{$s("table_name_type")}.*,
{$s("table_name")}.{$s("column_last_seen")} AS last_seen
FROM {$s("table_name")}
JOIN {$s("table_name_type")} ON
{$s("table_name")}.{$s("column_device_type")} = {$s("table_name_type")}.{$s("column_type_id")}
JOIN $data_repo_table_meta ON
$data_repo_col_device_id = {$s("table_name")}.{$s("column_device_id")}
WHERE {$s("table_name")}.{$s("column_device_id")} = :device_id
AND {$s("table_name")}.{$s("column_visible")} != 0;", [
"device_id" => $device_id
]
)->fetch(); // gets the next row from the query
$result = [];
foreach($query_result as $key => $value) {
// Hack! Filter out some useless columns
// We do this so that we can return everything we know about the
// device in a manner that means we don't need to alter this code
// if additional columns are added later.
if($key == self::$column_type_id)
continue;
$result[strtolower($key)] = $value;
}
return $result;
}
public function get_near_location(float $lat, float $long, int $count) {
$s = $this->get_static;
$o = $this->get_static_extra;
$result = $this->database->query(
"SELECT
{$s("table_name")}.{$s("column_device_id")} AS id,
{$s("table_name")}.{$s("column_device_name")} AS name,
{$s("table_name")}.{$s("column_lat")} AS latitude,
{$s("table_name")}.{$s("column_long")} AS longitude,
ST_DISTANCE_SPHERE(POINT(:latitude, :longitude), {$s("table_name")}.{$s("column_point")}) AS distance_calc,
{$s("table_name")}.{$s("column_last_seen")} AS last_seen
FROM {$s("table_name")}
WHERE {$s("table_name")}.{$s("column_point")} IS NOT NULL
AND {$s("table_name")}.{$s("column_visible")} != 0
ORDER BY ST_DISTANCE_SPHERE(POINT(:latitude_again, :longitude_again), {$s("table_name")}.{$s("column_point")})
LIMIT :count;", [
"latitude" => $lat,
"longitude" => $long,
"latitude_again" => $lat,
"longitude_again" => $long,
"count" => $count
]
)->fetchAll();
// Calculate the *actual* distance in metres.
// This is complicated and requires nasty formulae, so we're using a library here
// FUTURE: Apparently said library supports caching with PSR-6 - maybe we could take advantage of a PSR-6 implementation both here and elsewhere?
$loc = new Coordinate($lat, $long);
foreach($result as &$item) {
$item["distance_actual"] = $this->distance_calculator->getDistance(
$loc,
new Coordinate(
floatval($item["latitude"]),
floatval($item["longitude"])
)
);
}
return $result;
}
}