src/client_side_reply.h

   1 /*
   2  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   3  * ----------------------------------------------------------
   4  *
   5  *  Squid is the result of efforts by numerous individuals from
   6  *  the Internet community; see the CONTRIBUTORS file for full
   7  *  details.   Many organizations have provided support for Squid's
   8  *  development; see the SPONSORS file for full details.  Squid is
   9  *  Copyrighted (C) 2001 by the Regents of the University of
  10  *  California; see the COPYRIGHT file for full details.  Squid
  11  *  incorporates software developed and/or copyrighted by other
  12  *  sources; see the CREDITS file for full details.
  13  *
  14  *  This program is free software; you can redistribute it and/or modify
  15  *  it under the terms of the GNU General Public License as published by
  16  *  the Free Software Foundation; either version 2 of the License, or
  17  *  (at your option) any later version.
  18  *
  19  *  This program is distributed in the hope that it will be useful,
  20  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *  GNU General Public License for more details.
  23  *
  24  *  You should have received a copy of the GNU General Public License
  25  *  along with this program; if not, write to the Free Software
  26  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  27  *
  28  * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
  29  */
  30
  31 #ifndef SQUID_CLIENTSIDEREPLY_H
  32 #define SQUID_CLIENTSIDEREPLY_H
  33
  34 #include "acl/forward.h"
  35 #include "client_side_request.h"
  36 #include "ip/forward.h"
  37 #include "RequestFlags.h"
  38 #include "StoreClient.h"
  39
  40 class ErrorState;
  41
  42 /* XXX make static method */
  43
  44 class clientReplyContext : public RefCountable, public StoreClient
  45 {
  46
  47 public:
  48     static STCB CacheHit;
  49     static STCB HandleIMSReply;
  50     static STCB SendMoreData;
  51
  52     clientReplyContext(ClientHttpRequest *);
  53     ~clientReplyContext();
  54
  55     void saveState();
  56     void restoreState();
  57     void purgeRequest ();
  58     void purgeRequestFindObjectToPurge();
  59     void purgeDoMissPurge();
  60     void purgeFoundGet(StoreEntry *newEntry);
  61     void purgeFoundHead(StoreEntry *newEntry);
  62     void purgeFoundObject(StoreEntry *entry);
  63     void sendClientUpstreamResponse();
  64     void purgeDoPurgeGet(StoreEntry *entry);
  65     void purgeDoPurgeHead(StoreEntry *entry);
  66     void doGetMoreData();
  67     void identifyStoreObject();
  68     void identifyFoundObject(StoreEntry *entry);
  69     int storeOKTransferDone() const;
  70     int storeNotOKTransferDone() const;
  71     /// replaces current response store entry with the given one
  72     void setReplyToStoreEntry(StoreEntry *e, const char *reason);
  73     /// builds error using clientBuildError() and calls setReplyToError() below
  74     void setReplyToError(err_type, Http::StatusCode, const HttpRequestMethod&, char const *, Ip::Address &, HttpRequest *, const char *,
  75 #if USE_AUTH
  76                          Auth::UserRequest::Pointer);
  77 #else
  78                          void * unused);
  79 #endif
  80     /// creates a store entry for the reply and appends err to it
  81     void setReplyToError(const HttpRequestMethod& method, ErrorState *err);
  82     void createStoreEntry(const HttpRequestMethod& m, RequestFlags flags);
  83     void removeStoreReference(store_client ** scp, StoreEntry ** ep);
  84     void removeClientStoreReference(store_client **scp, ClientHttpRequest *http);
  85     void startError(ErrorState * err);
  86     void processExpired();
  87     clientStream_status_t replyStatus();
  88     void processMiss();
  89     void traceReply(clientStreamNode * node);
  90     const char *storeId() const { return (http->store_id.size() > 0 ? http->store_id.termedBuf() : http->uri); }
  91
  92     Http::StatusCode purgeStatus;
  93
  94     /* state variable - replace with class to handle storeentries at some point */
  95     int lookingforstore;
  96     virtual void created (StoreEntry *newEntry);
  97
  98     ClientHttpRequest *http;
  99     int headers_sz;
 100     store_client *sc;           /* The store_client we're using */
 101     StoreIOBuffer tempBuffer;   /* For use in validating requests via IMS */
 102     int old_reqsize;            /* ... again, for the buffer */
 103     size_t reqsize;
 104     size_t reqofs;
 105     char tempbuf[HTTP_REQBUF_SZ];       /* a temporary buffer if we need working storage */
 106 #if USE_CACHE_DIGESTS
 107
 108     const char *lookup_type;    /* temporary hack: storeGet() result: HIT/MISS/NONE */
 109 #endif
 110
 111     struct {
 112
 113         unsigned storelogiccomplete:1;
 114
 115         unsigned complete:1;            /* we have read all we can from upstream */
 116         bool headersSent;
 117     } flags;
 118     clientStreamNode *ourNode;  /* This will go away if/when this file gets refactored some more */
 119
 120 private:
 121     clientStreamNode *getNextNode() const;
 122     void makeThisHead();
 123     bool errorInStream(StoreIOBuffer const &result, size_t const &sizeToProcess)const ;
 124     void sendStreamError(StoreIOBuffer const &result);
 125     void pushStreamData(StoreIOBuffer const &result, char *source);
 126     clientStreamNode * next() const;
 127     StoreIOBuffer holdingBuffer;
 128     HttpReply *reply;
 129     void processReplyAccess();
 130     static ACLCB ProcessReplyAccessResult;
 131     void processReplyAccessResult(const allow_t &accessAllowed);
 132     void cloneReply();
 133     void buildReplyHeader ();
 134     bool alwaysAllowResponse(Http::StatusCode sline) const;
 135     int checkTransferDone();
 136     void processOnlyIfCachedMiss();
 137     void processConditional(StoreIOBuffer &result);
 138     void cacheHit(StoreIOBuffer result);
 139     void handleIMSReply(StoreIOBuffer result);
 140     void sendMoreData(StoreIOBuffer result);
 141     void triggerInitialStoreRead();
 142     void sendClientOldEntry();
 143     void purgeAllCached();
 144     void forgetHit();
 145     bool blockedHit() const;
 146
 147     void sendBodyTooLargeError();
 148     void sendPreconditionFailedError();
 149     void sendNotModified();
 150     void sendNotModifiedOrPreconditionFailedError();
 151
 152     StoreEntry *old_entry;
 153     store_client *old_sc;       /* ... for entry to be validated */
 154     bool deleting;
 155
 156     CBDATA_CLASS2(clientReplyContext);
 157 };
 158
 159 #endif /* SQUID_CLIENTSIDEREPLY_H */