implement cache

source/connector-mobilizon.php

@@ -13,6 +13,7 @@
 require_once __DIR__ . '/includes/exceptions/GeneralException.php';
 require_once __DIR__ . '/includes/exceptions/GroupNotFoundException.php';
 require_once __DIR__ . '/includes/Constants.php';
+require_once __DIR__ . '/includes/EventsCache.php';
 require_once __DIR__ . '/includes/Settings.php';
 require_once __DIR__ . '/includes/DateTimeWrapper.php';
 require_once __DIR__ . '/includes/Formatter.php';

source/includes/EventsCache.php

@@ -0,0 +1,19 @@
+<?php
+namespace MobilizonConnector;
+
+final class EventsCache {
+
+  private static $MAX_AGE_IN_S = 120;
+
+  public static function set(array $parameters, mixed $data): void {
+    // md5 is used as key must be 172 characters or fewer in length.
+    $key = md5(json_encode($parameters));
+    set_transient($key, $data, self::$MAX_AGE_IN_S);
+  }
+
+  public static function get(array $parameters): mixed {
+    $key = md5(json_encode($parameters));
+    $data = get_transient($key);
+    return $data;
+  }
+}

source/includes/GraphQlClient.php

@@ -47,20 +47,17 @@ final class GraphQlClient {
       }
       GRAPHQL;
 
+    $cachedEvents = EventsCache::get(['url' => $url, 'query' => $query, 'limit' => $limit]);
+    if ($cachedEvents !== false) {
+      return $cachedEvents;
+    }
+
     $endpoint = $url . '/api';
-    // const dataInCache = SessionCache.get(sessionStorage, {
-    //   url,
-    //   query,
-    //   variables: { limit },
-    // })
-    // if (dataInCache !== null) {
-    //   return Promise.resolve(dataInCache)
-    // }
     $data = self::query($endpoint, $query, ['limit' => $limit]);
     self::checkData($data);
 
-    // SessionCache.add(sessionStorage, { url, query, variables: { limit } }, data)
     $events = $data['data']['events']['elements'];
+    EventsCache::set(['url' => $url, 'query' => $query, 'limit' => $limit], $events);
     return $events;
   }
 
@@ -86,32 +83,19 @@ final class GraphQlClient {
       }
       GRAPHQL;
 
-    $endpoint = $url . '/api';
-
-    // const afterDatetime = DateTimeWrapper.getCurrentDatetimeAsString()
-    // const dataInCache = SessionCache.get(sessionStorage, {
-    //   url,
-    //   query,
-    //   variables: { afterDatetime, groupName, limit },
-    // })
-    // if (dataInCache !== null) {
-    //   return Promise.resolve(dataInCache)
-    // }
     $afterDatetime = date(\DateTime::ISO8601);
+
+    $cachedEvents = EventsCache::get(['url' => $url, 'query' => $query, 'afterDatetime' => $afterDatetime, 'groupName' => $groupName, 'limit' => $limit]);
+    if ($cachedEvents !== false) {
+      return $cachedEvents;
+    }
+
+    $endpoint = $url . '/api';
     $data = self::query($endpoint, $query, ['afterDatetime' => $afterDatetime, 'groupName' => $groupName, 'limit' => $limit]);
     self::checkData($data);
 
-    // return request(url, query, { afterDatetime, groupName, limit }).then(
-    //   (data) => {
-    //     SessionCache.add(
-    //       sessionStorage,
-    //       { url, query, variables: { afterDatetime, groupName, limit } },
-    //       data
-    //     )
-    //     return Promise.resolve(data)
-    //   }
-    // )
     $events = $data['data']['group']['organizedEvents']['elements'];
+    EventsCache::set(['url' => $url, 'query' => $query, 'afterDatetime' => $afterDatetime, 'groupName' => $groupName, 'limit' => $limit], $events);
     return $events;
   }
 

source/readme.txt

@@ -17,7 +17,7 @@ License: <wordpress-license>
 Features
 - Display events as Gutenberg block, as widget and as shortcut
 - Display events' title, date, and location, if available
-- Cache requests' responses for 2 minutes in the browser's `sessionStorage`
+- Cache requests' responses for 2 minutes in the database
 - Configure number of events to show per block, per widget and per shortcut
 - Optionally filter events by a specific group per block, per widget and per shortcut
 - Set the URL of the Mobilizon instance in the settings