44 lines
1.1 KiB
PHP
44 lines
1.1 KiB
PHP
<?php
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require_once __DIR__ . '/../connect.php';
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$lat = filterRequest("lat");
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$lng = filterRequest("lng");
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if (!$lat || !$lng) {
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jsonError("Missing coordinates");
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exit();
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}
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if (!isset($redis) || $redis === null) {
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// If Redis is not available, we fail gracefully.
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jsonSuccess(null, "Demand logged (fallback)");
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exit();
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}
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// Create a 1.5 km grid cell
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// 1 degree latitude is approximately 111 km.
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// 1.5 km / 111 km ≈ 0.0135 degrees.
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$grid_size = 0.0135;
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$grid_lat = round((float)$lat / $grid_size) * $grid_size;
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$grid_lng = round((float)$lng / $grid_size) * $grid_size;
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$grid_id = $grid_lat . "_" . $grid_lng;
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$redisKey = "demand:grid:" . $grid_id;
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try {
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// Increment the demand count for this grid
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$currentCount = $redis->incr($redisKey);
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// If this is the first request, set the expiry to 60 seconds
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if ($currentCount == 1) {
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$redis->expire($redisKey, 60);
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}
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jsonSuccess(["grid_id" => $grid_id, "count" => $currentCount], "Demand logged successfully");
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} catch (Exception $e) {
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error_log("[log_demand.php] Redis error: " . $e->getMessage());
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jsonError("Error logging demand");
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}
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?>
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