diff options
Diffstat (limited to 'program')
| -rw-r--r-- | program/lib/Roundcube/rcube_cache.php | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/program/lib/Roundcube/rcube_cache.php b/program/lib/Roundcube/rcube_cache.php index a708cb292..0017dcacc 100644 --- a/program/lib/Roundcube/rcube_cache.php +++ b/program/lib/Roundcube/rcube_cache.php @@ -45,6 +45,7 @@ class rcube_cache private $cache = array(); private $cache_changes = array(); private $cache_sums = array(); + private $max_packet = -1; /** @@ -319,7 +320,7 @@ class rcube_cache * Writes single cache record into DB. * * @param string $key Cache key name - * @param mxied $data Serialized cache data + * @param mixed $data Serialized cache data * * @param boolean True on success, False on failure */ @@ -329,6 +330,12 @@ class rcube_cache return false; } + // don't attempt to write too big data sets + if (strlen($data) > $this->max_packet_size()) { + trigger_error("rcube_cache: max_packet_size ($this->max_packet) exceeded for key $key. Tried to write " . strlen($data) . " bytes", E_USER_WARNING); + return false; + } + if ($this->type == 'memcache' || $this->type == 'apc') { return $this->add_record($this->ckey($key), $data); } @@ -591,4 +598,30 @@ class rcube_cache return $this->packed ? @unserialize($data) : $data; } + + /** + * Determine the maximum size for cache data to be written + */ + private function max_packet_size() + { + if ($this->max_packet < 0) { + $this->max_packet = 2097152; // default/max is 2 MB + + if ($this->type == 'db') { + $value = $this->db->get_variable('max_allowed_packet', 1048500); + $this->max_packet = min($value, $this->max_packet) - 2000; + } + else if ($this->type == 'memcache') { + $stats = $this->db->getStats(); + $remaining = $stats['limit_maxbytes'] - $stats['bytes']; + $this->max_packet = min($remaining / 5, $this->max_packet); + } + else if ($this->type == 'apc' && function_exists('apc_sma_info')) { + $stats = apc_sma_info(); + $this->max_packet = min($stats['avail_mem'] / 5, $this->max_packet); + } + } + + return $this->max_packet; + } } |