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   1 /* directory.cc - Results of directory-based searches from a notmuch database
   2  *
   3  * Copyright © 2009 Carl Worth
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see https://www.gnu.org/licenses/ .
  17  *
  18  * Author: Carl Worth <cworth@cworth.org>
  19  */
  20
  21 #include "notmuch-private.h"
  22 #include "database-private.h"
  23
  24 /* Create an iterator to iterate over the basenames of files (or
  25  * directories) that all share a common parent directory.
  26  */
  27 static notmuch_filenames_t *
  28 _create_filenames_for_terms_with_prefix (void *ctx,
  29                                          notmuch_database_t *notmuch,
  30                                          const char *prefix)
  31 {
  32     notmuch_string_list_t *filename_list;
  33     Xapian::TermIterator i, end;
  34
  35     i = notmuch->xapian_db->allterms_begin ();
  36     end = notmuch->xapian_db->allterms_end ();
  37     filename_list = _notmuch_database_get_terms_with_prefix (ctx, i, end,
  38                                                              prefix);
  39     if (unlikely (filename_list == NULL))
  40         return NULL;
  41
  42     return _notmuch_filenames_create (ctx, filename_list);
  43 }
  44
  45 struct _notmuch_directory {
  46     notmuch_database_t *notmuch;
  47     Xapian::docid document_id;
  48     Xapian::Document doc;
  49     time_t mtime;
  50 };
  51
  52 #define LOG_XAPIAN_EXCEPTION(directory, error) _log_xapian_exception (__location__, directory, error)
  53
  54 static void
  55 _log_xapian_exception (const char *where, notmuch_directory_t *dir,  const Xapian::Error error) {
  56     notmuch_database_t *notmuch = dir->notmuch;
  57     _notmuch_database_log (notmuch,
  58                            "A Xapian exception occurred at %s: %s\n",
  59                            where,
  60                            error.get_msg ().c_str ());
  61     notmuch->exception_reported = true;
  62 }
  63
  64
  65 /* We end up having to call the destructor explicitly because we had
  66  * to use "placement new" in order to initialize C++ objects within a
  67  * block that we allocated with talloc. So C++ is making talloc
  68  * slightly less simple to use, (we wouldn't need
  69  * talloc_set_destructor at all otherwise).
  70  */
  71 static int
  72 _notmuch_directory_destructor (notmuch_directory_t *directory)
  73 {
  74     directory->doc.~Document ();
  75
  76     return 0;
  77 }
  78
  79 static notmuch_private_status_t
  80 find_directory_document (notmuch_database_t *notmuch,
  81                          const char *db_path,
  82                          Xapian::Document *document)
  83 {
  84     notmuch_private_status_t status;
  85     Xapian::docid doc_id;
  86
  87     status = _notmuch_database_find_unique_doc_id (notmuch, "directory",
  88                                                    db_path, &doc_id);
  89     if (status) {
  90         *document = Xapian::Document ();
  91         return status;
  92     }
  93
  94     *document = notmuch->xapian_db->get_document (doc_id);
  95     return NOTMUCH_PRIVATE_STATUS_SUCCESS;
  96 }
  97
  98 /* Find or create a directory document.
  99  *
 100  * 'path' should be a path relative to the path of 'database', or else
 101  * should be an absolute path with initial components that match the
 102  * path of 'database'.
 103  *
 104  * If (flags & NOTMUCH_FIND_CREATE), then the directory document will
 105  * be created if it does not exist.  Otherwise, if the directory
 106  * document does not exist, *status_ret is set to
 107  * NOTMUCH_STATUS_SUCCESS and this returns NULL.
 108  */
 109 notmuch_directory_t *
 110 _notmuch_directory_find_or_create (notmuch_database_t *notmuch,
 111                                    const char *path,
 112                                    notmuch_find_flags_t flags,
 113                                    notmuch_status_t *status_ret)
 114 {
 115     notmuch_directory_t *directory;
 116     notmuch_private_status_t private_status;
 117     const char *db_path;
 118     bool create = (flags & NOTMUCH_FIND_CREATE);
 119
 120     if (! (notmuch->features & NOTMUCH_FEATURE_DIRECTORY_DOCS)) {
 121         *status_ret = NOTMUCH_STATUS_UPGRADE_REQUIRED;
 122         return NULL;
 123     }
 124
 125     *status_ret = NOTMUCH_STATUS_SUCCESS;
 126
 127     path = _notmuch_database_relative_path (notmuch, path);
 128
 129     if (create && _notmuch_database_mode (notmuch) == NOTMUCH_DATABASE_MODE_READ_ONLY)
 130         INTERNAL_ERROR ("Failure to ensure database is writable");
 131
 132     directory = talloc (notmuch, notmuch_directory_t);
 133     if (unlikely (directory == NULL)) {
 134         *status_ret = NOTMUCH_STATUS_OUT_OF_MEMORY;
 135         return NULL;
 136     }
 137
 138     directory->notmuch = notmuch;
 139
 140     /* "placement new"---not actually allocating memory */
 141     new (&directory->doc) Xapian::Document;
 142
 143     talloc_set_destructor (directory, _notmuch_directory_destructor);
 144
 145     db_path = _notmuch_database_get_directory_db_path (path);
 146
 147     try {
 148         Xapian::TermIterator i, end;
 149
 150         private_status = find_directory_document (notmuch, db_path,
 151                                                   &directory->doc);
 152         directory->document_id = directory->doc.get_docid ();
 153
 154         if (private_status == NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND) {
 155             if (! create) {
 156                 notmuch_directory_destroy (directory);
 157                 directory = NULL;
 158                 *status_ret = NOTMUCH_STATUS_SUCCESS;
 159                 goto DONE;
 160             }
 161
 162             void *local = talloc_new (directory);
 163             const char *parent, *basename;
 164             Xapian::docid parent_id;
 165             char *term = talloc_asprintf (local, "%s%s",
 166                                           _find_prefix ("directory"), db_path);
 167             directory->doc.add_term (term, 0);
 168
 169             directory->doc.set_data (path);
 170
 171             _notmuch_database_split_path (local, path, &parent, &basename);
 172
 173             *status_ret = _notmuch_database_find_directory_id (
 174                 notmuch, parent, NOTMUCH_FIND_CREATE, &parent_id);
 175             if (*status_ret) {
 176                 notmuch_directory_destroy (directory);
 177                 directory = NULL;
 178                 goto DONE;
 179             }
 180
 181             if (basename) {
 182                 term = talloc_asprintf (local, "%s%u:%s",
 183                                         _find_prefix ("directory-direntry"),
 184                                         parent_id, basename);
 185                 directory->doc.add_term (term, 0);
 186             }
 187
 188             directory->doc.add_value (NOTMUCH_VALUE_TIMESTAMP,
 189                                       Xapian::sortable_serialise (0));
 190
 191             directory->document_id = _notmuch_database_generate_doc_id (notmuch);
 192             directory->notmuch->
 193                 writable_xapian_db
 194                 -> replace_document (directory->document_id, directory->doc);
 195             talloc_free (local);
 196         }
 197
 198         directory->mtime = Xapian::sortable_unserialise (
 199             directory->doc.get_value (NOTMUCH_VALUE_TIMESTAMP));
 200     } catch (const Xapian::Error &error) {
 201         _notmuch_database_log (notmuch,
 202                                "A Xapian exception occurred finding/creating a directory: %s.\n",
 203                                error.get_msg ().c_str ());
 204         notmuch->exception_reported = true;
 205         notmuch_directory_destroy (directory);
 206         directory = NULL;
 207         *status_ret = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
 208     }
 209
 210   DONE:
 211     if (db_path != path)
 212         free ((char *) db_path);
 213
 214     return directory;
 215 }
 216
 217 unsigned int
 218 _notmuch_directory_get_document_id (notmuch_directory_t *directory)
 219 {
 220     return directory->document_id;
 221 }
 222
 223 notmuch_status_t
 224 notmuch_directory_set_mtime (notmuch_directory_t *directory,
 225                              time_t mtime)
 226 {
 227     notmuch_database_t *notmuch = directory->notmuch;
 228     notmuch_status_t status;
 229
 230     status = _notmuch_database_ensure_writable (notmuch);
 231     if (status)
 232         return status;
 233
 234     try {
 235         directory->doc.add_value (NOTMUCH_VALUE_TIMESTAMP,
 236                                   Xapian::sortable_serialise (mtime));
 237
 238         directory->notmuch
 239             ->writable_xapian_db->replace_document (directory->document_id, directory->doc);
 240
 241         directory->mtime = mtime;
 242
 243     } catch (const Xapian::Error &error) {
 244         _notmuch_database_log (notmuch,
 245                                "A Xapian exception occurred setting directory mtime: %s.\n",
 246                                error.get_msg ().c_str ());
 247         notmuch->exception_reported = true;
 248         return NOTMUCH_STATUS_XAPIAN_EXCEPTION;
 249     }
 250
 251     return NOTMUCH_STATUS_SUCCESS;
 252 }
 253
 254 time_t
 255 notmuch_directory_get_mtime (notmuch_directory_t *directory)
 256 {
 257     return directory->mtime;
 258 }
 259
 260 notmuch_filenames_t *
 261 notmuch_directory_get_child_files (notmuch_directory_t *directory)
 262 {
 263     char *term;
 264     notmuch_filenames_t *child_files = NULL;
 265
 266     term = talloc_asprintf (directory, "%s%u:",
 267                             _find_prefix ("file-direntry"),
 268                             directory->document_id);
 269
 270     try {
 271         child_files = _create_filenames_for_terms_with_prefix (directory,
 272                                                                directory->notmuch,
 273                                                                term);
 274     } catch (Xapian::Error &error) {
 275         LOG_XAPIAN_EXCEPTION (directory, error);
 276     }
 277
 278     talloc_free (term);
 279
 280     return child_files;
 281 }
 282
 283 notmuch_filenames_t *
 284 notmuch_directory_get_child_directories (notmuch_directory_t *directory)
 285 {
 286     char *term;
 287     notmuch_filenames_t *child_directories = NULL;
 288
 289     term = talloc_asprintf (directory, "%s%u:",
 290                             _find_prefix ("directory-direntry"),
 291                             directory->document_id);
 292
 293     try {
 294         child_directories = _create_filenames_for_terms_with_prefix (directory,
 295                                                                      directory->notmuch, term);
 296     } catch (Xapian::Error &error) {
 297         LOG_XAPIAN_EXCEPTION (directory, error);
 298     }
 299
 300     talloc_free (term);
 301
 302     return child_directories;
 303 }
 304
 305 notmuch_status_t
 306 notmuch_directory_delete (notmuch_directory_t *directory)
 307 {
 308     notmuch_status_t status;
 309
 310     status = _notmuch_database_ensure_writable (directory->notmuch);
 311     if (status)
 312         return status;
 313
 314     try {
 315         directory->notmuch->
 316             writable_xapian_db->delete_document (directory->document_id);
 317     } catch (const Xapian::Error &error) {
 318         _notmuch_database_log (directory->notmuch,
 319                                "A Xapian exception occurred deleting directory entry: %s.\n",
 320                                error.get_msg ().c_str ());
 321         directory->notmuch->exception_reported = true;
 322         status = NOTMUCH_STATUS_XAPIAN_EXCEPTION;
 323     }
 324     notmuch_directory_destroy (directory);
 325
 326     return status;
 327 }
 328
 329 void
 330 notmuch_directory_destroy (notmuch_directory_t *directory)
 331 {
 332     talloc_free (directory);
 333 }