src/PeerSelectState.h

   1 /*
   2  * AUTHOR: Robert Collins
   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  * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
  31  */
  32
  33 #ifndef   SQUID_PEERSELECTSTATE_H
  34 #define   SQUID_PEERSELECTSTATE_H
  35
  36 #include "Array.h"
  37 #include "cbdata.h"
  38 #include "comm/forward.h"
  39 #include "hier_code.h"
  40 #include "ip/Address.h"
  41 #include "PingData.h"
  42
  43 class HttpRequest;
  44 class StoreEntry;
  45
  46 typedef void PSC(Comm::ConnectionList *, void *);
  47
  48 SQUIDCEXTERN void peerSelect(Comm::ConnectionList *, HttpRequest *, StoreEntry *, PSC *, void *data);
  49 SQUIDCEXTERN void peerSelectInit(void);
  50
  51 /**
  52  * A peer which has been selected as a possible destination.
  53  * Listed as pointers here so as to prevent duplicates being added but will
  54  * be converted to a set of IP address path options before handing back out
  55  * to the caller.
  56  *
  57  * Certain connection flags and outgoing settings will also be looked up and
  58  * set based on the received request and peer settings before handing back.
  59  */
  60 class FwdServer
  61 {
  62 public:
  63     peer *_peer;                /* NULL --> origin server */
  64     hier_code code;
  65     FwdServer *next;
  66 };
  67
  68 class ps_state
  69 {
  70
  71 public:
  72     void *operator new(size_t);
  73     ps_state();
  74     HttpRequest *request;
  75     StoreEntry *entry;
  76     int always_direct;
  77     int never_direct;
  78     int direct;
  79     PSC *callback;
  80     void *callback_data;
  81
  82     Comm::ConnectionList *paths;    ///< the callers paths array. to be filled with our final results.
  83     FwdServer *servers;    ///< temporary linked list of peers we will pass back.
  84
  85     /*
  86      * Why are these Ip::Address instead of peer *?  Because a
  87      * peer structure can become invalid during the peer selection
  88      * phase, specifically after a reconfigure.  Thus we need to lookup
  89      * the peer * based on the address when we are finally ready to
  90      * reference the peer structure.
  91      */
  92
  93     Ip::Address first_parent_miss;
  94
  95     Ip::Address closest_parent_miss;
  96     /*
  97      * ->hit can be peer* because it should only be
  98      * accessed during the thread when it is set
  99      */
 100     peer *hit;
 101     peer_t hit_type;
 102     ping_data ping;
 103     ACLChecklist *acl_checklist;
 104 private:
 105     CBDATA_CLASS(ps_state);
 106 };
 107
 108 #endif /* SQUID_PEERSELECTSTATE_H */