39 lines
1.0 KiB
PHP
39 lines
1.0 KiB
PHP
<?php $app = require '../../app/inc.php';
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use App\Timetable\TimeMapper;
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$timeMapper = new TimeMapper($app->database->conn);
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/**
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* Long polling
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*/
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session_write_close();
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ignore_user_abort(false);
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set_time_limit(30);
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// if ajax request has send a timestamp, then $last_ajax_call = timestamp, else $last_ajax_call = null
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$last_ajax_call = isset($_GET['timestamp']) ? (int)$_GET['timestamp'] : NULL;
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// main loop
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while(TRUE)
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{
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$time = $timeMapper->getLatest();
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if ($time)
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{
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$last_change_in_timetable = $time->date->getTimestamp();
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if ($time && $last_ajax_call == NULL || $last_change_in_timetable > $last_ajax_call)
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{
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exit(json_encode(["data" => json_encode($timeMapper->getAll()), "timestamp" => $last_change_in_timetable]));
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}
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}
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// PHP caches file data, like requesting the size of a file, by default. clearstatcache() clears that cache
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clearstatcache();
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// wait for 1 sec (not very sexy as this blocks the PHP/Apache process, but that's how it goes)
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sleep(1);
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continue;
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}
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