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/*
* AUTHOR: Robert Collins
*
* SQUID Web Proxy Cache http://www.squid-cache.org/
* ----------------------------------------------------------
*
* Squid is the result of efforts by numerous individuals from
* the Internet community; see the CONTRIBUTORS file for full
* details. Many organizations have provided support for Squid's
* development; see the SPONSORS file for full details. Squid is
* Copyrighted (C) 2001 by the Regents of the University of
* California; see the COPYRIGHT file for full details. Squid
* incorporates software developed and/or copyrighted by other
* sources; see the CREDITS file for full details.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
*/
#ifndef SQUID_PEERSELECTSTATE_H
#define SQUID_PEERSELECTSTATE_H
#include "acl/Checklist.h"
#include "base/Vector.h"
#include "cbdata.h"
#include "comm/forward.h"
#include "hier_code.h"
#include "PingData.h"
#include "ip/Address.h"
class HttpRequest;
class StoreEntry;
class ErrorState;
typedef void PSC(Comm::ConnectionList *, ErrorState *, void *);
void peerSelect(Comm::ConnectionList *, HttpRequest *, StoreEntry *, PSC *, void *data);
void peerSelectInit(void);
/**
* A CachePeer which has been selected as a possible destination.
* Listed as pointers here so as to prevent duplicates being added but will
* be converted to a set of IP address path options before handing back out
* to the caller.
*
* Certain connection flags and outgoing settings will also be looked up and
* set based on the received request and CachePeer settings before handing back.
*/
class FwdServer
{
public:
CachePeer *_peer; /* NULL --> origin server */
hier_code code;
FwdServer *next;
};
class ps_state
{
public:
ps_state();
~ps_state();
// Produce a URL for display identifying the transaction we are
// trying to locate a peer for.
const char * url() const;
HttpRequest *request;
StoreEntry *entry;
allow_t always_direct;
allow_t never_direct;
int direct; // TODO: fold always_direct/never_direct/prefer_direct into this now that ACL can do a multi-state result.
PSC *callback;
void *callback_data;
ErrorState *lastError;
Comm::ConnectionList *paths; ///< the callers paths array. to be filled with our final results.
FwdServer *servers; ///< temporary linked list of peers we will pass back.
/*
* Why are these Ip::Address instead of CachePeer *? Because a
* CachePeer structure can become invalid during the CachePeer selection
* phase, specifically after a reconfigure. Thus we need to lookup
* the CachePeer * based on the address when we are finally ready to
* reference the CachePeer structure.
*/
Ip::Address first_parent_miss;
Ip::Address closest_parent_miss;
/*
* ->hit can be CachePeer* because it should only be
* accessed during the thread when it is set
*/
CachePeer *hit;
peer_t hit_type;
ping_data ping;
ACLChecklist *acl_checklist;
private:
CBDATA_CLASS2(ps_state);
};
#endif /* SQUID_PEERSELECTSTATE_H */
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