blob.c

   1 /*
   2  * Copyright (C) 2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file blob.c Macros and functions for blob handling. */
   8
   9 #include <fnmatch.h>
  10 #include "para.h"
  11 #include "error.h"
  12 #include "afh.h"
  13 #include "afs.h"
  14 #include "string.h"
  15 #include "net.h"
  16
  17 static struct osl_column_description blob_cols[] = {
  18         [BLOBCOL_ID] = {
  19                 .storage_type = OSL_MAPPED_STORAGE,
  20                 .storage_flags = OSL_RBTREE | OSL_UNIQUE | OSL_FIXED_SIZE,
  21                 .name = "id",
  22                 .data_size = 4,
  23                 .compare_function = uint32_compare
  24         },
  25         [BLOBCOL_NAME] = {
  26                 .storage_type = OSL_MAPPED_STORAGE,
  27                 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
  28                 .name = "name",
  29                 .compare_function = string_compare
  30         },
  31         [BLOBCOL_DEF] = {
  32                 .storage_type = OSL_DISK_STORAGE,
  33                 .storage_flags = 0,
  34                 .name = "definition"
  35         }
  36 };
  37
  38 /** \cond doxygen isn't smart enough to recognize these */
  39 INIT_BLOB_TABLE(lyrics);
  40 INIT_BLOB_TABLE(images);
  41 INIT_BLOB_TABLE(moods);
  42 INIT_BLOB_TABLE(playlists);
  43 /** \endcond */
  44
  45 /** Flags that may be passed to the \p ls functions of each blob  type. */
  46 enum blob_ls_flags {
  47         /** List both id and name. */
  48         BLOB_LS_FLAG_LONG = 1,
  49         /** Reverse sort order. */
  50         BLOB_LS_FLAG_REVERSE = 2,
  51         /** Sort by id instead of name. */
  52         BLOB_LS_FLAG_SORT_BY_ID = 4,
  53 };
  54
  55 /** Structure passed to the \p print_blob function. */
  56 struct lsblob_action_data {
  57         uint32_t flags;
  58         struct para_buffer pb;
  59 };
  60
  61 static int print_blob(struct osl_table *table, struct osl_row *row,
  62                 const char *name, void *data)
  63 {
  64         struct lsblob_action_data *lbad = data;
  65         struct osl_object obj;
  66         uint32_t id;
  67         int ret;
  68
  69         if (!(lbad->flags & BLOB_LS_FLAG_LONG)) {
  70                 para_printf(&lbad->pb, "%s\n", name);
  71                 return 1;
  72         }
  73         ret = osl_get_object(table, row, BLOBCOL_ID, &obj);
  74         if (ret < 0) {
  75                 para_printf(&lbad->pb, "%s: %s\n", name, PARA_STRERROR(-ret));
  76                 return ret;
  77         }
  78         id = *(uint32_t *)obj.data;
  79         para_printf(&lbad->pb, "%u\t%s\n", id, name);
  80         return 1;
  81 }
  82
  83 static int com_lsblob_callback(struct osl_table *table,
  84                 const struct osl_object *query, struct osl_object *result)
  85 {
  86         struct lsblob_action_data lbad = {.flags = *(uint32_t *)query};
  87         struct pattern_match_data pmd = {
  88                 .table = table,
  89                 .patterns = {.data = (char *)query->data + sizeof(uint32_t),
  90                         .size = query->size - sizeof(uint32_t)},
  91                 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING | PM_SKIP_EMPTY_NAME,
  92                 .match_col_num = BLOBCOL_NAME,
  93                 .data = &lbad,
  94                 .action = print_blob,
  95         };
  96         int ret;
  97
  98         if (lbad.flags & BLOB_LS_FLAG_REVERSE)
  99                 pmd.pm_flags |= PM_REVERSE_LOOP;
 100         if (!(lbad.flags & BLOB_LS_FLAG_SORT_BY_ID))
 101                 pmd.loop_col_num = BLOBCOL_ID;
 102         else
 103                 pmd.loop_col_num = BLOBCOL_NAME;
 104         ret = for_each_matching_row(&pmd);
 105         if (ret < 0)
 106                 para_printf(&lbad.pb, "%s\n", PARA_STRERROR(-ret));
 107         if (!lbad.pb.buf)
 108                 return 0;
 109         result->data = lbad.pb.buf;
 110         result->size = lbad.pb.size;
 111         return 1;
 112 }
 113
 114 static int com_lsblob(callback_function *f, int fd, int argc, char * const * const argv)
 115 {
 116         uint32_t flags = 0;
 117         struct osl_object options = {.data = &flags, .size = sizeof(flags)},
 118                 result;
 119         int i, ret;
 120
 121         for (i = 1; i < argc; i++) {
 122                 const char *arg = argv[i];
 123                 if (arg[0] != '-')
 124                         break;
 125                 if (!strcmp(arg, "--")) {
 126                         i++;
 127                         break;
 128                 }
 129                 if (!strcmp(arg, "-l")) {
 130                         flags |= BLOB_LS_FLAG_LONG;
 131                         continue;
 132                 }
 133                 if (!strcmp(arg, "-i")) {
 134                         flags |= BLOB_LS_FLAG_SORT_BY_ID;
 135                         continue;
 136                 }
 137                 if (!strcmp(arg, "-r")) {
 138                         flags |= BLOB_LS_FLAG_REVERSE;
 139                         continue;
 140                 }
 141         }
 142 //      if (argc > i)
 143 //              return -E_BLOB_SYNTAX;
 144         ret = send_option_arg_callback_request(&options, argc - i,
 145                 argv + i, f, &result);
 146         if (ret > 0) {
 147                 send_buffer(fd, (char *)result.data);
 148                 free(result.data);
 149         }
 150         return ret;
 151 }
 152
 153 static int cat_blob(struct osl_table *table, struct osl_row *row,
 154                 __a_unused const char *name, void *data)
 155 {
 156         int ret;
 157         struct osl_object *blobs = data;
 158         struct osl_object obj;
 159
 160         ret = osl_open_disk_object(table, row, BLOBCOL_DEF, &obj);
 161         if (ret < 0)
 162                 return ret;
 163         if (obj.size) {
 164                 blobs->data = para_realloc(blobs->data, blobs->size + obj.size);
 165                 memcpy(blobs->data + blobs->size, obj.data, obj.size);
 166                 blobs->size += obj.size;
 167         }
 168         return osl_close_disk_object(&obj);
 169 }
 170
 171 static int com_catblob_callback(struct osl_table *table,
 172                 const struct osl_object *query, struct osl_object *result)
 173 {
 174         int ret;
 175         struct pattern_match_data pmd = {
 176                 .table = table,
 177                 .patterns = *query,
 178                 .loop_col_num = BLOBCOL_NAME,
 179                 .match_col_num = BLOBCOL_NAME,
 180                 .pm_flags = PM_SKIP_EMPTY_NAME,
 181                 .data = result,
 182                 .action = cat_blob
 183         };
 184         result->data = NULL;
 185         ret = for_each_matching_row(&pmd);
 186         if (result->data)
 187                 return 1;
 188         return (ret > 0)? 0 : ret;
 189 }
 190
 191 static int com_catblob(callback_function *f, int fd, int argc,
 192                 char * const * const argv)
 193 {
 194         struct osl_object result;
 195         int ret;
 196
 197         if (argc < 2)
 198                 return -E_BLOB_SYNTAX;
 199         ret = send_standard_callback_request(argc - 1, argv + 1, f, &result);
 200         if (ret > 0) {
 201                 ret = send_bin_buffer(fd, (char *)result.data, result.size);
 202                 free(result.data);
 203         }
 204         return ret;
 205 }
 206
 207 struct rmblob_data {
 208         struct para_buffer pb;
 209         unsigned num_removed;
 210 };
 211
 212 static int remove_blob(struct osl_table *table, struct osl_row *row,
 213                 const char *name, void *data)
 214 {
 215         struct rmblob_data *rmbd = data;
 216         int ret = osl_del_row(table, row);
 217         if (ret < 0) {
 218                 para_printf(&rmbd->pb, "%s: %s\n", name, PARA_STRERROR(-ret));
 219                 return ret;
 220         }
 221         rmbd->num_removed++;
 222         return 1; /* return success to remove other matching blobs. */
 223 }
 224
 225 static int com_rmblob_callback(struct osl_table *table,
 226                 const struct osl_object *query,
 227                 __a_unused struct osl_object *result)
 228 {
 229         int ret;
 230         struct rmblob_data rmbd = {.num_removed = 0};
 231         struct pattern_match_data pmd = {
 232                 .table = table,
 233                 .patterns = *query,
 234                 .loop_col_num = BLOBCOL_NAME,
 235                 .match_col_num = BLOBCOL_NAME,
 236                 .pm_flags = PM_SKIP_EMPTY_NAME,
 237                 .data = &rmbd,
 238                 .action = remove_blob
 239         };
 240         result->data = NULL;
 241         ret = for_each_matching_row(&pmd);
 242         if (ret < 0)
 243                 para_printf(&rmbd.pb, "%s\n", PARA_STRERROR(-ret));
 244         if (!rmbd.num_removed)
 245                 para_printf(&rmbd.pb, "no matches, nothing removed\n");
 246         else
 247                 para_printf(&rmbd.pb, "removed %d blobs\n", rmbd.num_removed);
 248         result->data = rmbd.pb.buf;
 249         result->size = rmbd.pb.size;
 250         return 1;
 251 }
 252
 253 static int com_rmblob(callback_function *f, __a_unused int fd, int argc,
 254                 char * const * const argv)
 255 {
 256         int ret;
 257         struct osl_object result;
 258
 259         if (argc < 2)
 260                 return -E_MOOD_SYNTAX;
 261         ret = send_option_arg_callback_request(NULL, argc - 1, argv + 1, f,
 262                 &result);
 263         if (ret > 0) {
 264                 send_buffer(fd, (char *)result.data);
 265                 free(result.data);
 266         }
 267         return ret;
 268 }
 269
 270 static int com_addblob_callback(struct osl_table *table,
 271                 const struct osl_object *query,
 272                 __a_unused struct osl_object *result)
 273 {
 274         struct osl_object objs[NUM_BLOB_COLUMNS];
 275         char *name = query->data;
 276         size_t name_len = strlen(name) + 1;
 277         uint32_t id;
 278         unsigned num_rows;
 279         int ret;
 280
 281         ret = osl_get_num_rows(table, &num_rows);
 282         if (ret < 0)
 283                 return ret;
 284         if (!num_rows) { /* this is the first entry ever added */
 285                 /* insert dummy row containing the id */
 286                 id = 2; /* this entry will be entry #1, so 2 is the next */
 287                 objs[BLOBCOL_ID].data = &id;
 288                 objs[BLOBCOL_ID].size = sizeof(id);
 289                 objs[BLOBCOL_NAME].data = "";
 290                 objs[BLOBCOL_NAME].size = 1;
 291                 objs[BLOBCOL_DEF].data = "";
 292                 objs[BLOBCOL_DEF].size = 1;
 293                 ret = osl_add_row(table, objs);
 294                 if (ret < 0)
 295                         return ret;
 296         } else {
 297                 /* check if name already exists */
 298                 struct osl_row *row;
 299                 struct osl_object obj = {.data = name, .size = name_len};
 300                 ret = osl_get_row(table, BLOBCOL_NAME, &obj, &row);
 301                 if (ret < 0 && ret != -E_RB_KEY_NOT_FOUND)
 302                         return ret;
 303                 if (ret >= 0) { /* we already have a blob with this name */
 304                         obj.data = name + name_len;
 305                         obj.size = query->size - name_len;
 306                         return osl_update_object(table, row, BLOBCOL_DEF, &obj);
 307                 }
 308                 /* new blob, get id of the dummy row and increment it */
 309                 obj.data = "";
 310                 obj.size = 1;
 311                 ret = osl_get_row(table, BLOBCOL_NAME, &obj, &row);
 312                 if (ret < 0)
 313                         return ret;
 314                 ret = osl_get_object(table, row, BLOBCOL_ID, &obj);
 315                 if (ret < 0)
 316                         return ret;
 317                 id = *(uint32_t *)obj.data + 1;
 318                 obj.data = &id;
 319                 ret = osl_update_object(table, row, BLOBCOL_ID, &obj);
 320                 if (ret < 0)
 321                         return ret;
 322         }
 323         id--;
 324         objs[BLOBCOL_ID].data = &id;
 325         objs[BLOBCOL_ID].size = sizeof(id);
 326         objs[BLOBCOL_NAME].data = name;
 327         objs[BLOBCOL_NAME].size = name_len;
 328         objs[BLOBCOL_DEF].data = name + name_len;
 329         objs[BLOBCOL_DEF].size = query->size - name_len;
 330         return osl_add_row(table, objs);
 331 }
 332
 333 static int com_addblob(callback_function *f, int fd, int argc,
 334                 char * const * const argv)
 335 {
 336         struct osl_object arg_obj;
 337
 338         if (argc != 2)
 339                 return -E_BLOB_SYNTAX;
 340         if (!*argv[1]) /* empty name is reserved for the dummy row */
 341                 return -E_BLOB_SYNTAX;
 342         PARA_NOTICE_LOG("argv[1]: %s\n", argv[1]);
 343         arg_obj.size = strlen(argv[1]) + 1;
 344         arg_obj.data = (char *)argv[1];
 345         return stdin_command(fd, &arg_obj, f, 10 * 1024 * 1024, NULL);
 346 }
 347
 348 static int com_mvblob_callback(struct osl_table *table,
 349                 const struct osl_object *query,
 350                 __a_unused struct osl_object *result)
 351 {
 352         char *src = (char *) query->data;
 353         struct osl_object obj = {.data = src, .size = strlen(src) + 1};
 354         char *dest = src + obj.size;
 355         struct osl_row *row;
 356         int ret = osl_get_row(table, BLOBCOL_NAME, &obj, &row);
 357
 358         if (ret < 0)
 359                 return ret;
 360         obj.data = dest;
 361         obj.size = strlen(dest) + 1;
 362         return osl_update_object(table, row, BLOBCOL_NAME, &obj);
 363 }
 364
 365 static int com_mvblob(callback_function *f,  __a_unused int fd,
 366                 int argc, char * const * const argv)
 367 {
 368         if (argc != 3)
 369                 return -E_MOOD_SYNTAX;
 370         return send_option_arg_callback_request(NULL, argc - 1, argv + 1, f,
 371                 NULL);
 372 }
 373
 374 #define DEFINE_BLOB_COMMAND(cmd_name, table_name, cmd_prefix) \
 375         static int com_ ## cmd_name ## cmd_prefix ## _callback(const struct osl_object *query, \
 376                         struct osl_object *output) \
 377         { \
 378                 return com_ ## cmd_name ## blob_callback(table_name ## _table, query, output); \
 379         } \
 380         int com_ ## cmd_name ## cmd_prefix(int fd, int argc, char * const * const argv) \
 381         { \
 382                 return com_ ## cmd_name ## blob(com_ ## cmd_name ## cmd_prefix ## _callback, fd, argc, argv); \
 383         }
 384
 385 static int blob_get_name_by_id(struct osl_table *table, uint32_t id,
 386                 char **name)
 387 {
 388         struct osl_row *row;
 389         struct osl_object obj = {.data = &id, .size = sizeof(id)};
 390         int ret;
 391
 392         *name = NULL;
 393         if (!id)
 394                 return 1;
 395         ret = osl_get_row(table, BLOBCOL_ID, &obj, &row);
 396         if (ret < 0)
 397                 return ret;
 398         ret = osl_get_object(table, row, BLOBCOL_NAME, &obj);
 399         if (ret < 0)
 400                 return ret;
 401         *name = (char *)obj.data;
 402         return 1;
 403 }
 404
 405 /** Define the \p get_name_by_id function for this blob type. */
 406 #define DEFINE_GET_NAME_BY_ID(table_name, cmd_prefix) \
 407         int cmd_prefix ## _get_name_by_id(uint32_t id, char **name) \
 408         { \
 409                 return blob_get_name_by_id(table_name ## _table, id, name); \
 410         }
 411
 412 static int blob_get_name_and_def_by_row(struct osl_table *table,
 413                 const struct osl_row *row, char **name, struct osl_object *def)
 414 {
 415         struct osl_object obj;
 416         int ret = osl_get_object(table, row, BLOBCOL_NAME, &obj);
 417         if (ret < 0)
 418                 return ret;
 419         *name = obj.data;
 420         return osl_open_disk_object(table, row, BLOBCOL_DEF, def);
 421 }
 422 /** Define the \p get_name_and_def_by_row function for this blob type. */
 423 #define DEFINE_GET_NAME_AND_DEF_BY_ROW(table_name, cmd_prefix) \
 424         int cmd_prefix ## _get_name_and_def_by_row(const struct osl_row *row, \
 425                 char **name, struct osl_object *def) \
 426         { \
 427                 return blob_get_name_and_def_by_row(table_name ## _table, \
 428                         row, name, def); \
 429         }
 430
 431 /** Define the \p shutdown function for this blob type. */
 432 #define DEFINE_BLOB_SHUTDOWN(table_name) \
 433         void table_name ## _shutdown(enum osl_close_flags flags) \
 434         { \
 435                 osl_close_table(table_name ## _table, flags); \
 436                 table_name ## _table = NULL; \
 437         }
 438
 439 static int blob_init(struct osl_table **table,
 440                 struct osl_table_description *desc,
 441                 struct table_info *ti, const char *db)
 442 {
 443         int ret;
 444         desc->dir = db;
 445         ti->desc = desc;
 446         ret = osl_open_table(ti->desc, table);
 447         if (ret >= 0)
 448                 return ret;
 449         *table = NULL;
 450         return ret == -E_NOENT? 1 : ret;
 451 }
 452
 453 /** Define the \p init function for this blob type. */
 454 #define DEFINE_BLOB_INIT(table_name) \
 455         int table_name ## _init(struct table_info *ti, const char *db) \
 456         { \
 457                 return blob_init(&table_name ## _table, \
 458                         &table_name ## _table_desc, ti, db); \
 459         }
 460
 461
 462 /** Define all functions for this blob type. */
 463 #define DEFINE_BLOB_FUNCTIONS(table_name, cmd_prefix) \
 464         DEFINE_BLOB_COMMAND(ls, table_name, cmd_prefix) \
 465         DEFINE_BLOB_COMMAND(cat, table_name, cmd_prefix) \
 466         DEFINE_BLOB_COMMAND(add, table_name, cmd_prefix) \
 467         DEFINE_BLOB_COMMAND(rm, table_name, cmd_prefix) \
 468         DEFINE_BLOB_COMMAND(mv, table_name, cmd_prefix) \
 469         DEFINE_GET_NAME_BY_ID(table_name, cmd_prefix); \
 470         DEFINE_GET_NAME_AND_DEF_BY_ROW(table_name, cmd_prefix); \
 471         DEFINE_BLOB_SHUTDOWN(table_name); \
 472         DEFINE_BLOB_INIT(table_name);
 473
 474 /** \cond doxygen isn't smart enough to recognize these */
 475 DEFINE_BLOB_FUNCTIONS(lyrics, lyr);
 476 DEFINE_BLOB_FUNCTIONS(images, img);
 477 DEFINE_BLOB_FUNCTIONS(moods, mood);
 478 DEFINE_BLOB_FUNCTIONS(playlists, pl);
 479 /** \endcond */