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@ -44,6 +44,7 @@ class rcube_cache_shared
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private $cache = array();
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private $cache = array();
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private $cache_changes = array();
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private $cache_changes = array();
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private $cache_sums = array();
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private $cache_sums = array();
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private $max_packet = -1;
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/**
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/**
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@ -312,7 +313,7 @@ class rcube_cache_shared
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* Writes single cache record into DB.
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* Writes single cache record into DB.
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*
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*
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* @param string $key Cache key name
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* @param string $key Cache key name
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* @param mxied $data Serialized cache data
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* @param mixed $data Serialized cache data
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*
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*
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* @param boolean True on success, False on failure
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* @param boolean True on success, False on failure
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*/
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*/
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@ -322,6 +323,12 @@ class rcube_cache_shared
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return false;
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return false;
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}
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}
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// don't attempt to write too big data sets
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if (strlen($data) > $this->max_packet_size()) {
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trigger_error("rcube_cache: max_packet_size ($this->max_packet) exceeded for key $key. Tried to write " . strlen($data) . " bytes", E_USER_WARNING);
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return false;
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}
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if ($this->type == 'memcache' || $this->type == 'apc') {
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if ($this->type == 'memcache' || $this->type == 'apc') {
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return $this->add_record($this->ckey($key), $data);
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return $this->add_record($this->ckey($key), $data);
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}
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}
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@ -578,4 +585,30 @@ class rcube_cache_shared
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return $this->packed ? @unserialize($data) : $data;
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return $this->packed ? @unserialize($data) : $data;
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}
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}
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/**
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* Determine the maximum size for cache data to be written
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*/
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private function max_packet_size()
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{
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if ($this->max_packet < 0) {
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$this->max_packet = 2097152; // default/max is 2 MB
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if ($this->type == 'db') {
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$value = $this->db->get_variable('max_allowed_packet', 1048500);
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$this->max_packet = min($value, $this->max_packet) - 2000;
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}
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else if ($this->type == 'memcache') {
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$stats = $this->db->getStats();
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$remaining = $stats['limit_maxbytes'] - $stats['bytes'];
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$this->max_packet = min($remaining / 5, $this->max_packet);
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}
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else if ($this->type == 'apc' && function_exists('apc_sma_info')) {
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$stats = apc_sma_info();
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$this->max_packet = min($stats['avail_mem'] / 5, $this->max_packet);
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}
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}
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return $this->max_packet;
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}
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}
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}
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