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 "RefCount.h"
  35 #include "HttpHeader.h"
  36 #include "clientStream.h"
  37 #include "StoreClient.h"
  38 #include "client_side_request.h"
  39
  40 class ErrorState;
  41 #include "ip/forward.h"
  42
  43 /* XXX make static method */
  44
  45 class clientReplyContext : public RefCountable, public StoreClient
  46 {
  47
  48 public:
  49     void *operator new (size_t byteCount);
  50     void operator delete (void *address);
  51     static STCB CacheHit;
  52     static STCB HandleIMSReply;
  53     static STCB SendMoreData;
  54
  55     clientReplyContext(ClientHttpRequest *);
  56     ~clientReplyContext();
  57
  58     void saveState();
  59     void restoreState();
  60     void purgeRequest ();
  61     void purgeRequestFindObjectToPurge();
  62     void purgeDoMissPurge();
  63     void purgeFoundGet(StoreEntry *newEntry);
  64     void purgeFoundHead(StoreEntry *newEntry);
  65     void purgeFoundObject(StoreEntry *entry);
  66     void sendClientUpstreamResponse();
  67     void purgeDoPurgeGet(StoreEntry *entry);
  68     void purgeDoPurgeHead(StoreEntry *entry);
  69     void doGetMoreData();
  70     void identifyStoreObject();
  71     void identifyFoundObject(StoreEntry *entry);
  72     int storeOKTransferDone() const;
  73     int storeNotOKTransferDone() const;
  74     /// replaces current response store entry with the given one
  75     void setReplyToStoreEntry(StoreEntry *e);
  76     /// builds error using clientBuildError() and calls setReplyToError() below
  77     void setReplyToError(err_type, http_status, const HttpRequestMethod&, char const *, Ip::Address &, HttpRequest *, const char *,
  78 #if USE_AUTH
  79                          Auth::UserRequest::Pointer);
  80 #else
  81                          void * unused);
  82 #endif
  83     /// creates a store entry for the reply and appends err to it
  84     void setReplyToError(const HttpRequestMethod& method, ErrorState *err);
  85     void createStoreEntry(const HttpRequestMethod& m, request_flags flags);
  86     void removeStoreReference(store_client ** scp, StoreEntry ** ep);
  87     void removeClientStoreReference(store_client **scp, ClientHttpRequest *http);
  88     void startError(ErrorState * err);
  89     void processExpired();
  90     clientStream_status_t replyStatus();
  91     void processMiss();
  92     void traceReply(clientStreamNode * node);
  93
  94     http_status purgeStatus;
  95
  96     /* state variable - replace with class to handle storeentries at some point */
  97     int lookingforstore;
  98     virtual void created (StoreEntry *newEntry);
  99
 100     ClientHttpRequest *http;
 101     int headers_sz;
 102     store_client *sc;           /* The store_client we're using */
 103     StoreIOBuffer tempBuffer;   /* For use in validating requests via IMS */
 104     int old_reqsize;            /* ... again, for the buffer */
 105     size_t reqsize;
 106     size_t reqofs;
 107     char tempbuf[HTTP_REQBUF_SZ];       /* a temporary buffer if we need working storage */
 108 #if USE_CACHE_DIGESTS
 109
 110     const char *lookup_type;    /* temporary hack: storeGet() result: HIT/MISS/NONE */
 111 #endif
 112
 113     struct {
 114
 115         unsigned storelogiccomplete:1;
 116
 117         unsigned complete:1;            /* we have read all we can from upstream */
 118         bool headersSent;
 119     } flags;
 120     clientStreamNode *ourNode;  /* This will go away if/when this file gets refactored some more */
 121
 122 private:
 123     CBDATA_CLASS(clientReplyContext);
 124     clientStreamNode *getNextNode() const;
 125     void makeThisHead();
 126     bool errorInStream(StoreIOBuffer const &result, size_t const &sizeToProcess)const ;
 127     void sendStreamError(StoreIOBuffer const &result);
 128     void pushStreamData(StoreIOBuffer const &result, char *source);
 129     clientStreamNode * next() const;
 130     StoreIOBuffer holdingBuffer;
 131     HttpReply *reply;
 132     void processReplyAccess();
 133     static ACLCB ProcessReplyAccessResult;
 134     void processReplyAccessResult(const allow_t &accessAllowed);
 135     void cloneReply();
 136     void buildReplyHeader ();
 137     bool alwaysAllowResponse(http_status sline) const;
 138     int checkTransferDone();
 139     void processOnlyIfCachedMiss();
 140     void processConditional(StoreIOBuffer &result);
 141     void cacheHit(StoreIOBuffer result);
 142     void handleIMSReply(StoreIOBuffer result);
 143     void sendMoreData(StoreIOBuffer result);
 144     void triggerInitialStoreRead();
 145     void sendClientOldEntry();
 146     void purgeAllCached();
 147
 148     void sendBodyTooLargeError();
 149     void sendPreconditionFailedError();
 150     void sendNotModified();
 151     void sendNotModifiedOrPreconditionFailedError();
 152
 153     StoreEntry *old_entry;
 154     store_client *old_sc;       /* ... for entry to be validated */
 155     bool deleting;
 156 };
 157
 158 #endif /* SQUID_CLIENTSIDEREPLY_H */