LCOV - code coverage report
Current view: top level - cache - message_cache.cc (source / functions) Hit Total Coverage
Test: report.info Lines: 47 47 100.0 %
Date: 2012-05-15 Functions: 6 6 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 84 160 52.5 %

           Branch data     Line data    Source code
       1                 :            : // Copyright (C) 2010  Internet Systems Consortium, Inc. ("ISC")
       2                 :            : //
       3                 :            : // Permission to use, copy, modify, and/or distribute this software for any
       4                 :            : //
       5                 :            : // purpose with or without fee is hereby granted, provided that the above
       6                 :            : // copyright notice and this permission notice appear in all copies.
       7                 :            : //
       8                 :            : // THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
       9                 :            : // REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
      10                 :            : // AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
      11                 :            : // INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
      12                 :            : // LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
      13                 :            : // OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
      14                 :            : // PERFORMANCE OF THIS SOFTWARE.
      15                 :            : 
      16                 :            : #include <config.h>
      17                 :            : 
      18                 :            : #include <nsas/nsas_entry_compare.h>
      19                 :            : #include <nsas/hash_table.h>
      20                 :            : #include <nsas/hash_deleter.h>
      21                 :            : #include "message_cache.h"
      22                 :            : #include "message_utility.h"
      23                 :            : #include "cache_entry_key.h"
      24                 :            : #include "logger.h"
      25                 :            : 
      26                 :            : namespace isc {
      27                 :            : namespace cache {
      28                 :            : 
      29                 :            : using namespace isc::nsas;
      30                 :            : using namespace isc::dns;
      31                 :            : using namespace std;
      32                 :            : using namespace MessageUtility;
      33                 :            : 
      34                 :         39 : MessageCache::MessageCache(const RRsetCachePtr& rrset_cache,
      35                 :            :                            uint32_t cache_size, uint16_t message_class,
      36                 :            :                            const RRsetCachePtr& negative_soa_cache):
      37                 :            :     message_class_(message_class),
      38                 :            :     rrset_cache_(rrset_cache),
      39                 :            :     negative_soa_cache_(negative_soa_cache),
      40                 :            :     message_table_(new NsasEntryCompare<MessageEntry>, cache_size),
      41                 :            :     message_lru_((3 * cache_size),
      42 [ +  - ][ +  - ]:         39 :                   new HashDeleter<MessageEntry>(message_table_))
                 [ +  - ]
      43                 :            : {
      44 [ +  - ][ +  - ]:         78 :     LOG_DEBUG(logger, DBG_TRACE_BASIC, CACHE_MESSAGES_INIT).arg(cache_size).
         [ +  - ][ +  - ]
                 [ +  - ]
      45         [ +  - ]:         39 :         arg(RRClass(message_class));
      46                 :         39 : }
      47                 :            : 
      48 [ +  - ][ +  - ]:         39 : MessageCache::~MessageCache() {
      49                 :            :     // Destroy all the message entries in the cache.
      50         [ +  - ]:         39 :     message_lru_.clear();
      51 [ +  - ][ +  - ]:         39 :     LOG_DEBUG(logger, DBG_TRACE_BASIC, CACHE_MESSAGES_DEINIT);
         [ +  - ][ +  - ]
      52                 :         75 : }
      53                 :            : 
      54                 :            : bool
      55                 :         28 : MessageCache::lookup(const isc::dns::Name& qname,
      56                 :            :                      const isc::dns::RRType& qtype,
      57                 :            :                      isc::dns::Message& response)
      58                 :            : {
      59                 :         56 :     std::string entry_name = genCacheEntryName(qname, qtype);
      60                 :         28 :     HashKey entry_key = HashKey(entry_name, RRClass(message_class_));
      61                 :         28 :     MessageEntryPtr msg_entry = message_table_.get(entry_key);
      62         [ +  + ]:         28 :     if(msg_entry) {
      63                 :            :         // Check whether the message entry has expired.
      64         [ +  + ]:         19 :        if (msg_entry->getExpireTime() > time(NULL)) {
      65 [ +  - ][ +  - ]:         36 :             LOG_DEBUG(logger, DBG_TRACE_DATA, CACHE_MESSAGES_FOUND).
                 [ +  - ]
      66 [ +  - ][ +  - ]:         18 :                 arg(entry_name);
      67         [ +  - ]:         18 :             message_lru_.touch(msg_entry);
      68         [ +  - ]:         18 :             return (msg_entry->genMessage(time(NULL), response));
      69                 :            :         } else {
      70                 :            :             // message entry expires, remove it from hash table and lru list.
      71 [ +  - ][ +  - ]:          2 :             LOG_DEBUG(logger, DBG_TRACE_DATA, CACHE_MESSAGES_EXPIRED).
                 [ +  - ]
      72 [ +  - ][ +  - ]:          1 :                 arg(entry_name);
      73         [ +  - ]:          1 :             message_table_.remove(entry_key);
      74         [ +  - ]:          1 :             message_lru_.remove(msg_entry);
      75                 :            :             return (false);
      76                 :            :        }
      77                 :            :     }
      78                 :            : 
      79 [ +  - ][ +  - ]:          9 :     LOG_DEBUG(logger, DBG_TRACE_DATA, CACHE_MESSAGES_UNKNOWN).arg(entry_name);
         [ +  - ][ +  - ]
                 [ +  - ]
      80                 :            :     return (false);
      81                 :            : }
      82                 :            : 
      83                 :            : bool
      84                 :         25 : MessageCache::update(const Message& msg) {
      85         [ +  + ]:         25 :     if (!canMessageBeCached(msg)){
      86 [ +  - ][ +  - ]:          2 :         LOG_DEBUG(logger, DBG_TRACE_DATA, CACHE_MESSAGES_UNCACHEABLE).
      87 [ +  - ][ +  - ]:          2 :             arg((*msg.beginQuestion())->getName()).
         [ +  - ][ +  - ]
                 [ +  - ]
      88 [ +  - ][ +  - ]:          3 :             arg((*msg.beginQuestion())->getType()).
         [ +  - ][ +  - ]
      89 [ +  - ][ +  - ]:          3 :             arg((*msg.beginQuestion())->getClass());
      90                 :            :         return (false);
      91                 :            :     }
      92                 :            : 
      93                 :         49 :     QuestionIterator iter = msg.beginQuestion();
      94 [ +  - ][ +  - ]:         48 :     LOG_DEBUG(logger, DBG_TRACE_DATA, CACHE_MESSAGES_UPDATE).
                 [ +  - ]
      95 [ +  - ][ +  - ]:         24 :         arg((*iter)->getName()).arg((*iter)->getType()).
         [ +  - ][ +  - ]
                 [ +  - ]
      96 [ +  - ][ +  - ]:         48 :         arg((*iter)->getClass());
      97         [ +  - ]:         24 :     std::string entry_name = genCacheEntryName((*iter)->getName(),
      98 [ +  - ][ +  - ]:         72 :                                                (*iter)->getType());
      99                 :         24 :     HashKey entry_key = HashKey(entry_name, RRClass(message_class_));
     100                 :            : 
     101                 :            :     // The simplest way to update is removing the old message entry directly.
     102                 :            :     // We have find the existed message entry, since we need to delete it
     103                 :            :     // from lru list too.
     104                 :            :     // TODO, but there should be a better way, since we here have to remove and
     105                 :            :     // add the message entry, maybe there is one way to touch it once.
     106                 :         24 :     MessageEntryPtr old_msg_entry = message_table_.get(entry_key);
     107         [ +  + ]:         24 :     if (old_msg_entry) {
     108 [ +  - ][ +  - ]:          8 :         LOG_DEBUG(logger, DBG_TRACE_DATA, CACHE_MESSAGES_REMOVE).
                 [ +  - ]
     109 [ +  - ][ +  - ]:          4 :             arg((*iter)->getName()).arg((*iter)->getType()).
         [ +  - ][ +  - ]
                 [ +  - ]
     110 [ +  - ][ +  - ]:          8 :             arg((*iter)->getClass());
     111         [ +  - ]:          4 :         message_lru_.remove(old_msg_entry);
     112                 :            :     }
     113                 :            : 
     114                 :            :     MessageEntryPtr msg_entry(new MessageEntry(msg, rrset_cache_,
     115 [ +  - ][ +  - ]:         24 :                                                negative_soa_cache_));
                 [ +  - ]
     116         [ +  - ]:         24 :     message_lru_.add(msg_entry);
     117                 :         48 :     return (message_table_.add(msg_entry, entry_key, true));
     118                 :            : }
     119                 :            : 
     120                 :            : } // namespace cache
     121                 :          3 : } // namespace isc
     122                 :            : 

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