From ecded9573d71d85605c2b29dd30edc86c431e4e9 Mon Sep 17 00:00:00 2001
From: William <William@willy.club>
Date: Mon, 21 Mar 2022 12:28:18 +0100
Subject: [PATCH] Commit

---
 app/view/pages/race/live-results.php | 30 ++++++++++++++++++++++
 app/view/template/header.php         |  1 +
 public/race/live-results.php         |  5 ++++
 public/race/long-polling.php         | 38 ++++++++++++++++++++++++++++
 4 files changed, 74 insertions(+)
 create mode 100644 app/view/pages/race/live-results.php
 create mode 100644 public/race/live-results.php
 create mode 100644 public/race/long-polling.php

diff --git a/app/view/pages/race/live-results.php b/app/view/pages/race/live-results.php
new file mode 100644
index 0000000..52ebbb7
--- /dev/null
+++ b/app/view/pages/race/live-results.php
@@ -0,0 +1,30 @@
+<h1>Live resultater</h1>
+<p id="response">Venter på data...</p>
+<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
+<script>
+function getContent(timestamp)
+{
+    var queryString = {'timestamp' : timestamp};
+
+    $.ajax(
+        {
+            type: 'GET',
+            url: 'long-polling.php',
+            data: queryString,
+            success: function(data){
+                // put result data into "obj"
+                var obj = jQuery.parseJSON(data);
+                // put the data_from_file into #response
+                $('#response').html(obj.data);
+                // call the function again, this time with the timestamp we just got from server.php
+                getContent(obj.timestamp);
+            }
+        }
+    );
+}
+
+// initialize jQuery
+$(function() {
+    getContent();
+});
+</script>
\ No newline at end of file
diff --git a/app/view/template/header.php b/app/view/template/header.php
index 0f36deb..83f24b8 100644
--- a/app/view/template/header.php
+++ b/app/view/template/header.php
@@ -38,6 +38,7 @@
             <h4>Felles</h4>
             <ul>
                 <li><a href="<?=$this->config['root_url']?>index.php">Forside</a></li>
+                <li><a href="<?=$this->config['root_url']?>race/live-results.php">Resultater</a></li>
             </ul>
 
             <?php if ($this->user->loggedIn): ?>
diff --git a/public/race/live-results.php b/public/race/live-results.php
new file mode 100644
index 0000000..3390160
--- /dev/null
+++ b/public/race/live-results.php
@@ -0,0 +1,5 @@
+<?php $app = require '../../app/inc.php';
+
+$app->view('template/header', ["title" => "Live resultater"]);
+$app->view('pages/race/live-results');
+$app->view('template/footer');
\ No newline at end of file
diff --git a/public/race/long-polling.php b/public/race/long-polling.php
new file mode 100644
index 0000000..3b72f4f
--- /dev/null
+++ b/public/race/long-polling.php
@@ -0,0 +1,38 @@
+<?php $app = require '../../app/inc.php';
+
+use App\Timetable\TimeMapper;
+
+$timeMapper = new TimeMapper($app->database->conn);
+
+/**
+ * Long polling
+ */
+session_write_close();
+ignore_user_abort(false);
+set_time_limit(30);
+
+// if ajax request has send a timestamp, then $last_ajax_call = timestamp, else $last_ajax_call = null
+$last_ajax_call = isset($_GET['timestamp']) ? (int)$_GET['timestamp'] : NULL;
+
+// main loop
+while(TRUE)
+{
+    $time = $timeMapper->getLatest();
+
+    if ($time)
+    {
+        $last_change_in_timetable = $time->date->getTimestamp();
+
+        if ($time && $last_ajax_call == NULL || $last_change_in_timetable > $last_ajax_call)
+        {
+            exit(json_encode(["data" => json_encode($timeMapper->getAll()), "timestamp" => $last_change_in_timetable]));
+        }
+    }
+
+    // PHP caches file data, like requesting the size of a file, by default. clearstatcache() clears that cache
+    clearstatcache();
+    // wait for 1 sec (not very sexy as this blocks the PHP/Apache process, but that's how it goes)
+    sleep(1);
+    continue;
+}
+