From 8ef419f795c8ac9cc50b4c0236185939c851ca32 Mon Sep 17 00:00:00 2001
From: Sebastian Grewe <sebastian@grewe.ca>
Date: Tue, 21 Jan 2014 10:16:17 +0100
Subject: [PATCH] [ADDED] Static cache with no auto-expiration

---
 public/include/classes/statistics.class.php |  8 +++---
 public/include/classes/statscache.class.php | 27 +++++++++++++++++++++
 2 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/public/include/classes/statistics.class.php b/public/include/classes/statistics.class.php
index a1b5ac7e..bd80dec0 100644
--- a/public/include/classes/statistics.class.php
+++ b/public/include/classes/statistics.class.php
@@ -487,7 +487,7 @@ class Statistics extends Base {
       while ($row = $result->fetch_assoc()) {
         $aData['data'][$row['id']] = $row;
       }
-      return $this->memcache->setCache(STATISTICS_ALL_USER_HASHRATES, $aData);
+      return $this->memcache->setStaticCache(STATISTICS_ALL_USER_HASHRATES, $aData, 600);
     } else {
       return $this->sqlError();
     }
@@ -501,7 +501,7 @@ class Statistics extends Base {
   public function getUserHashrate($account_id, $interval=180) {
     $this->debug->append("STA " . __METHOD__, 4);
     // Dual-caching, try statistics cron first, then fallback to local, then fallbock to SQL
-    if ($data = $this->memcache->get(STATISTICS_ALL_USER_HASHRATES)) {
+    if ($data = $this->memcache->getStatic(STATISTICS_ALL_USER_HASHRATES)) {
       if (array_key_exists($account_id, $data['data']))
         return $data['data'][$account_id]['hashrate'];
       // We have no cached value, we return defaults
@@ -563,7 +563,7 @@ class Statistics extends Base {
   public function getUserShareDifficulty($account_id, $interval=180) {
     $this->debug->append("STA " . __METHOD__, 4);
     // Dual-caching, try statistics cron first, then fallback to local, then fallbock to SQL
-    if ($data = $this->memcache->get(STATISTICS_ALL_USER_HASHRATES)) {
+    if ($data = $this->memcache->getStatic(STATISTICS_ALL_USER_HASHRATES)) {
       if (array_key_exists($account_id, $data['data']))
         return $data['data'][$account_id]['avgsharediff'];
       // We have no cached value, we return defaults
@@ -592,7 +592,7 @@ class Statistics extends Base {
   public function getUserSharerate($account_id, $interval=180) {
     $this->debug->append("STA " . __METHOD__, 4);
     // Dual-caching, try statistics cron first, then fallback to local, then fallbock to SQL
-    if ($data = $this->memcache->get(STATISTICS_ALL_USER_HASHRATES)) {
+    if ($data = $this->memcache->getStatic(STATISTICS_ALL_USER_HASHRATES)) {
       if (array_key_exists($account_id, $data['data']))
         return $data['data'][$account_id]['sharerate'];
       // We have no cached value, we return defaults
diff --git a/public/include/classes/statscache.class.php b/public/include/classes/statscache.class.php
index 45dcba07..e6bd84c4 100644
--- a/public/include/classes/statscache.class.php
+++ b/public/include/classes/statscache.class.php
@@ -44,6 +44,18 @@ class StatsCache {
     return $this->cache->set($this->getRound() . '_' . $this->config['memcache']['keyprefix'] . $key, $value, $expiration);
   }
 
+  /**
+   * Special memcache->set call bypassing any auto-expiration systems
+   * Can be used as a static, auto-updated cache via crons
+   **/
+  public function setStaticCache($key, $value, $expiration=NULL) {
+    if (! $this->config['memcache']['enabled']) return false;
+    if (empty($expiration))
+      $expiration = $this->config['memcache']['expiration'] + rand( -$this->config['memcache']['splay'], $this->config['memcache']['splay']);
+    $this->debug->append("Storing " . $this->config['memcache']['keyprefix'] . "$key with expiration $expiration", 3);
+    return $this->cache->set($this->config['memcache']['keyprefix'] . $key, $value, $expiration);
+  }
+
   /**
    * Wrapper around memcache->get
    * Always return false if memcache is disabled
@@ -58,6 +70,21 @@ class StatsCache {
       $this->debug->append("Key not found", 3);
     }
   }
+
+  /**
+   * As the static set call, we try to fetch static data here
+   **/
+  public function getStatic($key, $cache_cb = NULL, &$cas_token = NULL) {
+    if (! $this->config['memcache']['enabled']) return false;
+    $this->debug->append("Trying to fetch key " . $this->config['memcache']['keyprefix'] . "$key from cache", 3);
+    if ($data = $this->cache->get($this->config['memcache']['keyprefix'].$key)) {
+      $this->debug->append("Found key in cache", 3);
+      return $data;
+    } else {
+      $this->debug->append("Key not found", 3);
+    }
+  }
+
   /**
    * Another wrapper, we want to store data in memcache and return the actual data
    * for further processing