src/PeerDigest.h

   1
   2 /*
   3  *
   4  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   5  * ----------------------------------------------------------
   6  *
   7  *  Squid is the result of efforts by numerous individuals from
   8  *  the Internet community; see the CONTRIBUTORS file for full
   9  *  details.   Many organizations have provided support for Squid's
  10  *  development; see the SPONSORS file for full details.  Squid is
  11  *  Copyrighted (C) 2001 by the Regents of the University of
  12  *  California; see the COPYRIGHT file for full details.  Squid
  13  *  incorporates software developed and/or copyrighted by other
  14  *  sources; see the CREDITS file for full details.
  15  *
  16  *  This program is free software; you can redistribute it and/or modify
  17  *  it under the terms of the GNU General Public License as published by
  18  *  the Free Software Foundation; either version 2 of the License, or
  19  *  (at your option) any later version.
  20  *
  21  *  This program is distributed in the hope that it will be useful,
  22  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  *  GNU General Public License for more details.
  25  *
  26  *  You should have received a copy of the GNU General Public License
  27  *  along with this program; if not, write to the Free Software
  28  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  29  *
  30  */
  31
  32 #ifndef   SQUID_PEERDIGEST_H
  33 #define   SQUID_PEERDIGEST_H
  34
  35 #if USE_CACHE_DIGESTS
  36
  37 #include "cbdata.h"
  38 /* for CacheDigestGuessStats */
  39 #include "StatCounters.h"
  40
  41 class Version {
  42 public:
  43     short int current;          /* current version */
  44     short int required;         /* minimal version that can safely handle current version */
  45 };
  46
  47 /* digest control block; used for transmission and storage */
  48
  49 class StoreDigestCBlock
  50 {
  51 public:
  52     Version ver;
  53     int capacity;
  54     int count;
  55     int del_count;
  56     int mask_size;
  57     unsigned char bits_per_entry;
  58     unsigned char hash_func_count;
  59     short int reserved_short;
  60     int reserved[32 - 6];
  61 };
  62
  63 class DigestFetchState {
  64 public:
  65     PeerDigest *pd;
  66     StoreEntry *entry;
  67     StoreEntry *old_entry;
  68     store_client *sc;
  69     store_client *old_sc;
  70     HttpRequest *request;
  71     int offset;
  72     int mask_offset;
  73     time_t start_time;
  74     time_t resp_time;
  75     time_t expires;
  76
  77     struct {
  78         int msg;
  79         int bytes;
  80     }
  81
  82     sent, recv;
  83     char buf[SM_PAGE_SIZE];
  84     ssize_t bufofs;
  85     digest_read_state_t state;
  86 };
  87
  88 class PeerDigest
  89 {
  90
  91 public:
  92     void *operator new (size_t);
  93     void operator delete(void *);
  94
  95     CachePeer *peer;          /**< pointer back to peer structure, argh */
  96     CacheDigest *cd;            /**< actual digest structure */
  97     String host;                /**< copy of peer->host */
  98     const char *req_result;     /**< text status of the last request */
  99
 100     struct {
 101         unsigned int needed:1;          /**< there were requests for this digest */
 102         unsigned int usable:1;          /**< can be used for lookups */
 103         unsigned int requested:1;       /**< in process of receiving [fresh] digest */
 104     } flags;
 105
 106     struct {
 107         /* all times are absolute unless augmented with _delay */
 108         time_t initialized;     /* creation */
 109         time_t needed;          /* first lookup/use by a peer */
 110         time_t next_check;      /* next scheduled check/refresh event */
 111         time_t retry_delay;     /* delay before re-checking _invalid_ digest */
 112         time_t requested;       /* requested a fresh copy of a digest */
 113         time_t req_delay;       /* last request response time */
 114         time_t received;        /* received the current copy of a digest */
 115         time_t disabled;        /* disabled for good */
 116     } times;
 117
 118     struct {
 119         CacheDigestGuessStats guess;
 120         int used_count;
 121
 122         struct {
 123             int msgs;
 124             kb_t kbytes;
 125         } sent, recv;
 126     } stats;
 127
 128 private:
 129     CBDATA_CLASS(PeerDigest);
 130 };
 131
 132 extern const Version CacheDigestVer;
 133
 134 extern PeerDigest *peerDigestCreate(CachePeer * p);
 135 extern void peerDigestNeeded(PeerDigest * pd);
 136 extern void peerDigestNotePeerGone(PeerDigest * pd);
 137 extern void peerDigestStatsReport(const PeerDigest * pd, StoreEntry * e);
 138
 139 #endif /* USE_CACHE_DIGESTS */
 140
 141 #endif /* SQUID_PEERDIGEST_H */