src/fs/fs_list_indexed.c

   1 /*
   2      This file is part of GNUnet.
   3      (C) 2003, 2004, 2006, 2009 Christian Grothoff (and other contributing authors)
   4
   5      GNUnet is free software; you can redistribute it and/or modify
   6      it under the terms of the GNU General Public License as published
   7      by the Free Software Foundation; either version 2, or (at your
   8      option) any later version.
   9
  10      GNUnet is distributed in the hope that it will be useful, but
  11      WITHOUT ANY WARRANTY; without even the implied warranty of
  12      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13      General Public License for more details.
  14
  15      You should have received a copy of the GNU General Public License
  16      along with GNUnet; see the file COPYING.  If not, write to the
  17      Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18      Boston, MA 02111-1307, USA.
  19 */
  20
  21 /**
  22  * @file fs/fs_list_indexed.c
  23  * @author Christian Grothoff
  24  * @brief provide a list of all indexed files
  25  */
  26
  27 #include "platform.h"
  28 #include "gnunet_constants.h"
  29 #include "gnunet_fs_service.h"
  30 #include "gnunet_protocols.h"
  31 #include "fs.h"
  32
  33
  34 /**
  35  * Context for "GNUNET_FS_get_indexed_files".
  36  */
  37 struct GetIndexedContext
  38 {
  39   /**
  40    * Handle to global FS context.
  41    */
  42   struct GNUNET_FS_Handle *h;
  43
  44   /**
  45    * Connection to the FS service.
  46    */
  47   struct GNUNET_CLIENT_Connection *client;
  48
  49   /**
  50    * Function to call for each indexed file.
  51    */
  52   GNUNET_FS_IndexedFileProcessor iterator;
  53
  54   /**
  55    * Closure for iterator.
  56    */
  57   void *iterator_cls;
  58
  59   /**
  60    * Continuation to trigger at the end.
  61    */
  62   GNUNET_SCHEDULER_Task cont;
  63
  64   /**
  65    * Closure for cont.
  66    */
  67   void *cont_cls;
  68 };
  69
  70
  71 /**
  72  * Function called on each response from the FS
  73  * service with information about indexed files.
  74  *
  75  * @param cls closure (of type "struct GetIndexedContext*")
  76  * @param msg message with indexing information
  77  */
  78 static void
  79 handle_index_info (void *cls,
  80                    const struct GNUNET_MessageHeader *msg)
  81 {
  82   struct GetIndexedContext *gic = cls;
  83   const struct IndexInfoMessage *iim;
  84   uint16_t msize;
  85   const char *filename;
  86
  87   if (NULL == msg)
  88     {
  89       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
  90                   _("Failed to receive response for `%s' request from `%s' service.\n"),
  91                   "GET_INDEXED",
  92                   "fs");
  93       GNUNET_SCHEDULER_add_continuation (gic->h->sched,
  94                                          gic->cont,
  95                                          gic->cont_cls,
  96                                          GNUNET_SCHEDULER_REASON_TIMEOUT);
  97       GNUNET_CLIENT_disconnect (gic->client, GNUNET_NO);
  98       GNUNET_free (gic);
  99       return;
 100     }
 101   if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_END)
 102     {
 103       /* normal end-of-list */
 104       GNUNET_SCHEDULER_add_continuation (gic->h->sched,
 105                                          gic->cont,
 106                                          gic->cont_cls,
 107                                          GNUNET_SCHEDULER_REASON_PREREQ_DONE);
 108       GNUNET_CLIENT_disconnect (gic->client, GNUNET_NO);
 109       GNUNET_free (gic);
 110       return;
 111     }
 112   msize = ntohs (msg->size);
 113   iim = (const struct IndexInfoMessage*) msg;
 114   filename = (const char*) &iim[1];
 115   if ( (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_ENTRY) ||
 116        (msize <= sizeof (struct IndexInfoMessage)) ||
 117        (filename[msize-sizeof (struct IndexInfoMessage) -1] != '\0') )
 118     {
 119       /* bogus reply */
 120       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 121                   _("Failed to receive valid response for `%s' request from `%s' service.\n"),
 122                   "GET_INDEXED",
 123                   "fs");
 124       GNUNET_SCHEDULER_add_continuation (gic->h->sched,
 125                                          gic->cont,
 126                                          gic->cont_cls,
 127                                          GNUNET_SCHEDULER_REASON_TIMEOUT);
 128       GNUNET_CLIENT_disconnect (gic->client, GNUNET_NO);
 129       GNUNET_free (gic);
 130       return;
 131     }
 132   if (GNUNET_OK !=
 133       gic->iterator (gic->iterator_cls,
 134                      filename,
 135                      &iim->file_id))
 136     {
 137       GNUNET_SCHEDULER_add_continuation (gic->h->sched,
 138                                          gic->cont,
 139                                          gic->cont_cls,
 140                                          GNUNET_SCHEDULER_REASON_PREREQ_DONE);
 141       GNUNET_CLIENT_disconnect (gic->client, GNUNET_NO);
 142       GNUNET_free (gic);
 143       return;
 144     }
 145   /* get more */
 146   GNUNET_CLIENT_receive (gic->client,
 147                          &handle_index_info,
 148                          gic,
 149                          GNUNET_CONSTANTS_SERVICE_TIMEOUT);
 150 }
 151
 152
 153 /**
 154  * Iterate over all indexed files.
 155  *
 156  * @param h handle to the file sharing subsystem
 157  * @param iterator function to call on each indexed file
 158  * @param iterator_cls closure for iterator
 159  * @param cont continuation to call when done;
 160  *             reason should be "TIMEOUT" (on
 161  *             error) or  "PREREQ_DONE" (on success)
 162  * @param cont_cls closure for cont
 163  */
 164 void
 165 GNUNET_FS_get_indexed_files (struct GNUNET_FS_Handle *h,
 166                              GNUNET_FS_IndexedFileProcessor iterator,
 167                              void *iterator_cls,
 168                              GNUNET_SCHEDULER_Task cont,
 169                              void *cont_cls)
 170 {
 171   struct GNUNET_CLIENT_Connection *client;
 172   struct GetIndexedContext *gic;
 173   struct GNUNET_MessageHeader msg;
 174
 175   client = GNUNET_CLIENT_connect (h->sched,
 176                                   "fs",
 177                                   h->cfg);
 178   if (NULL == client)
 179     {
 180       GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
 181                   _("Failed to not connect to `%s' service.\n"),
 182                   "fs");
 183       GNUNET_SCHEDULER_add_continuation (h->sched,
 184                                          cont,
 185                                          cont_cls,
 186                                          GNUNET_SCHEDULER_REASON_TIMEOUT);
 187       return;
 188     }
 189
 190   gic = GNUNET_malloc (sizeof (struct GetIndexedContext));
 191   gic->h = h;
 192   gic->client = client;
 193   gic->iterator = iterator;
 194   gic->iterator_cls = iterator_cls;
 195   gic->cont = cont;
 196   gic->cont_cls = cont_cls;
 197   msg.size = htons (sizeof (struct GNUNET_MessageHeader));
 198   msg.type = htons (GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_GET);
 199   GNUNET_assert (GNUNET_OK ==
 200                  GNUNET_CLIENT_transmit_and_get_response (client,
 201                                                           &msg,
 202                                                           GNUNET_CONSTANTS_SERVICE_TIMEOUT,
 203                                                           GNUNET_YES,
 204                                                           &handle_index_info,
 205                                                           gic));
 206 }
 207
 208 /* end of fs_list_indexed.c */