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 "base/RefCount.h"
  35 #include "client_side_request.h"
  36 #include "clientStream.h"
  37 #include "HttpHeader.h"
  38 #include "RequestFlags.h"
  39 #include "StoreClient.h"
  40
  41 class ErrorState;
  42 #include "ip/forward.h"
  43
  44 /* XXX make static method */
  45
  46 class clientReplyContext : public RefCountable, public StoreClient
  47 {
  48
  49 public:
  50     void *operator new (size_t byteCount);
  51     void operator delete (void *address);
  52     static STCB CacheHit;
  53     static STCB HandleIMSReply;
  54     static STCB SendMoreData;
  55
  56     clientReplyContext(ClientHttpRequest *);
  57     ~clientReplyContext();
  58
  59     void saveState();
  60     void restoreState();
  61     void purgeRequest ();
  62     void purgeRequestFindObjectToPurge();
  63     void purgeDoMissPurge();
  64     void purgeFoundGet(StoreEntry *newEntry);
  65     void purgeFoundHead(StoreEntry *newEntry);
  66     void purgeFoundObject(StoreEntry *entry);
  67     void sendClientUpstreamResponse();
  68     void purgeDoPurgeGet(StoreEntry *entry);
  69     void purgeDoPurgeHead(StoreEntry *entry);
  70     void doGetMoreData();
  71     void identifyStoreObject();
  72     void identifyFoundObject(StoreEntry *entry);
  73     int storeOKTransferDone() const;
  74     int storeNotOKTransferDone() const;
  75     /// replaces current response store entry with the given one
  76     void setReplyToStoreEntry(StoreEntry *e);
  77     /// builds error using clientBuildError() and calls setReplyToError() below
  78     void setReplyToError(err_type, http_status, const HttpRequestMethod&, char const *, Ip::Address &, HttpRequest *, const char *,
  79 #if USE_AUTH
  80                          Auth::UserRequest::Pointer);
  81 #else
  82                          void * unused);
  83 #endif
  84     /// creates a store entry for the reply and appends err to it
  85     void setReplyToError(const HttpRequestMethod& method, ErrorState *err);
  86     void createStoreEntry(const HttpRequestMethod& m, RequestFlags flags);
  87     void removeStoreReference(store_client ** scp, StoreEntry ** ep);
  88     void removeClientStoreReference(store_client **scp, ClientHttpRequest *http);
  89     void startError(ErrorState * err);
  90     void processExpired();
  91     clientStream_status_t replyStatus();
  92     void processMiss();
  93     void traceReply(clientStreamNode * node);
  94     const char *storeId() const { return (http->store_id.size() > 0 ? http->store_id.termedBuf() : http->uri); }
  95
  96     http_status purgeStatus;
  97
  98     /* state variable - replace with class to handle storeentries at some point */
  99     int lookingforstore;
 100     virtual void created (StoreEntry *newEntry);
 101
 102     ClientHttpRequest *http;
 103     int headers_sz;
 104     store_client *sc;           /* The store_client we're using */
 105     StoreIOBuffer tempBuffer;   /* For use in validating requests via IMS */
 106     int old_reqsize;            /* ... again, for the buffer */
 107     size_t reqsize;
 108     size_t reqofs;
 109     char tempbuf[HTTP_REQBUF_SZ];       /* a temporary buffer if we need working storage */
 110 #if USE_CACHE_DIGESTS
 111
 112     const char *lookup_type;    /* temporary hack: storeGet() result: HIT/MISS/NONE */
 113 #endif
 114
 115     struct {
 116
 117         unsigned storelogiccomplete:1;
 118
 119         unsigned complete:1;            /* we have read all we can from upstream */
 120         bool headersSent;
 121     } flags;
 122     clientStreamNode *ourNode;  /* This will go away if/when this file gets refactored some more */
 123
 124 private:
 125     clientStreamNode *getNextNode() const;
 126     void makeThisHead();
 127     bool errorInStream(StoreIOBuffer const &result, size_t const &sizeToProcess)const ;
 128     void sendStreamError(StoreIOBuffer const &result);
 129     void pushStreamData(StoreIOBuffer const &result, char *source);
 130     clientStreamNode * next() const;
 131     StoreIOBuffer holdingBuffer;
 132     HttpReply *reply;
 133     void processReplyAccess();
 134     static ACLCB ProcessReplyAccessResult;
 135     void processReplyAccessResult(const allow_t &accessAllowed);
 136     void cloneReply();
 137     void buildReplyHeader ();
 138     bool alwaysAllowResponse(http_status sline) const;
 139     int checkTransferDone();
 140     void processOnlyIfCachedMiss();
 141     void processConditional(StoreIOBuffer &result);
 142     void cacheHit(StoreIOBuffer result);
 143     void handleIMSReply(StoreIOBuffer result);
 144     void sendMoreData(StoreIOBuffer result);
 145     void triggerInitialStoreRead();
 146     void sendClientOldEntry();
 147     void purgeAllCached();
 148
 149     void sendBodyTooLargeError();
 150     void sendPreconditionFailedError();
 151     void sendNotModified();
 152     void sendNotModifiedOrPreconditionFailedError();
 153
 154     StoreEntry *old_entry;
 155     store_client *old_sc;       /* ... for entry to be validated */
 156     bool deleting;
 157
 158     CBDATA_CLASS(clientReplyContext);
 159 };
 160
 161 #endif /* SQUID_CLIENTSIDEREPLY_H */