ovsdb/ovsdb-tool.c

   1 /*
   2  * Copyright (c) 2009, 2010 Nicira Networks.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18 #include <errno.h>
  19 #include <fcntl.h>
  20 #include <getopt.h>
  21 #include <signal.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "command-line.h"
  26 #include "compiler.h"
  27 #include "file.h"
  28 #include "lockfile.h"
  29 #include "log.h"
  30 #include "json.h"
  31 #include "ovsdb.h"
  32 #include "ovsdb-error.h"
  33 #include "socket-util.h"
  34 #include "table.h"
  35 #include "timeval.h"
  36 #include "util.h"
  37
  38 #include "vlog.h"
  39 #define THIS_MODULE VLM_ovsdb_tool
  40
  41 /* -m, --more: Verbosity level for "show-log" command output. */
  42 static int show_log_verbosity;
  43
  44 static const struct command all_commands[];
  45
  46 static void usage(void) NO_RETURN;
  47 static void parse_options(int argc, char *argv[]);
  48
  49 int
  50 main(int argc, char *argv[])
  51 {
  52     set_program_name(argv[0]);
  53     time_init();
  54     vlog_init();
  55     parse_options(argc, argv);
  56     signal(SIGPIPE, SIG_IGN);
  57     run_command(argc - optind, argv + optind, all_commands);
  58     return 0;
  59 }
  60
  61 static void
  62 parse_options(int argc, char *argv[])
  63 {
  64     static struct option long_options[] = {
  65         {"more", no_argument, 0, 'm'},
  66         {"verbose", optional_argument, 0, 'v'},
  67         {"help", no_argument, 0, 'h'},
  68         {"version", no_argument, 0, 'V'},
  69         {0, 0, 0, 0},
  70     };
  71     char *short_options = long_options_to_short_options(long_options);
  72
  73     for (;;) {
  74         int c;
  75
  76         c = getopt_long(argc, argv, short_options, long_options, NULL);
  77         if (c == -1) {
  78             break;
  79         }
  80
  81         switch (c) {
  82         case 'm':
  83             show_log_verbosity++;
  84             break;
  85
  86         case 'h':
  87             usage();
  88
  89         case 'V':
  90             OVS_PRINT_VERSION(0, 0);
  91             exit(EXIT_SUCCESS);
  92
  93         case 'v':
  94             vlog_set_verbosity(optarg);
  95             break;
  96
  97         case '?':
  98             exit(EXIT_FAILURE);
  99
 100         default:
 101             abort();
 102         }
 103     }
 104     free(short_options);
 105 }
 106
 107 static void
 108 usage(void)
 109 {
 110     printf("%s: Open vSwitch database management utility\n"
 111            "usage: %s [OPTIONS] COMMAND [ARG...]\n"
 112            "  create DB SCHEMA   create DB with the given SCHEMA\n"
 113            "  compact DB [DST]   compact DB in-place (or to DST)\n"
 114            "  convert DB SCHEMA [DST]   convert DB to SCHEMA (to DST)\n"
 115            "  extract-schema DB  print DB's schema on stdout\n"
 116            "  query DB TRNS      execute read-only transaction on DB\n"
 117            "  transact DB TRNS   execute read/write transaction on DB\n"
 118            "  show-log DB        prints information about DB's log entries\n",
 119            program_name, program_name);
 120     vlog_usage();
 121     printf("\nOther options:\n"
 122            "  -m, --more                  increase show-log verbosity\n"
 123            "  -h, --help                  display this help message\n"
 124            "  -V, --version               display version information\n");
 125     exit(EXIT_SUCCESS);
 126 }
 127 \f
 128 static struct json *
 129 parse_json(const char *s)
 130 {
 131     struct json *json = json_from_string(s);
 132     if (json->type == JSON_STRING) {
 133         ovs_fatal(0, "\"%s\": %s", s, json->u.string);
 134     }
 135     return json;
 136 }
 137
 138 static void
 139 print_and_free_json(struct json *json)
 140 {
 141     char *string = json_to_string(json, JSSF_SORT);
 142     json_destroy(json);
 143     puts(string);
 144     free(string);
 145 }
 146
 147 static void
 148 check_ovsdb_error(struct ovsdb_error *error)
 149 {
 150     if (error) {
 151         ovs_fatal(0, "%s", ovsdb_error_to_string(error));
 152     }
 153 }
 154 \f
 155 static void
 156 do_create(int argc OVS_UNUSED, char *argv[])
 157 {
 158     const char *db_file_name = argv[1];
 159     const char *schema_file_name = argv[2];
 160     struct ovsdb_schema *schema;
 161     struct ovsdb_log *log;
 162     struct json *json;
 163
 164     /* Read schema from file and convert to JSON. */
 165     check_ovsdb_error(ovsdb_schema_from_file(schema_file_name, &schema));
 166     json = ovsdb_schema_to_json(schema);
 167     ovsdb_schema_destroy(schema);
 168
 169     /* Create database file. */
 170     check_ovsdb_error(ovsdb_log_open(db_file_name, OVSDB_LOG_CREATE,
 171                                      -1, &log));
 172     check_ovsdb_error(ovsdb_log_write(log, json));
 173     check_ovsdb_error(ovsdb_log_commit(log));
 174     ovsdb_log_close(log);
 175
 176     json_destroy(json);
 177 }
 178
 179 static void
 180 compact_or_convert(const char *src_name, const char *dst_name,
 181                    const struct ovsdb_schema *new_schema,
 182                    const char *comment)
 183 {
 184     struct lockfile *src_lock;
 185     struct lockfile *dst_lock;
 186     bool in_place = dst_name == NULL;
 187     struct ovsdb *db;
 188     int retval;
 189
 190     /* Lock the source, if we will be replacing it. */
 191     if (in_place) {
 192         retval = lockfile_lock(src_name, 0, &src_lock);
 193         if (retval) {
 194             ovs_fatal(retval, "%s: failed to lock lockfile", src_name);
 195         }
 196     }
 197
 198     /* Get (temporary) destination and lock it. */
 199     if (in_place) {
 200         dst_name = xasprintf("%s.tmp", src_name);
 201     }
 202     retval = lockfile_lock(dst_name, 0, &dst_lock);
 203     if (retval) {
 204         ovs_fatal(retval, "%s: failed to lock lockfile", dst_name);
 205     }
 206
 207     /* Save a copy. */
 208     check_ovsdb_error(new_schema
 209                       ? ovsdb_file_open_as_schema(src_name, new_schema, &db)
 210                       : ovsdb_file_open(src_name, true, &db, NULL));
 211     check_ovsdb_error(ovsdb_file_save_copy(dst_name, false, comment, db));
 212     ovsdb_destroy(db);
 213
 214     /* Replace source. */
 215     if (in_place) {
 216         if (rename(dst_name, src_name)) {
 217             ovs_fatal(errno, "failed to rename \"%s\" to \"%s\"",
 218                       dst_name, src_name);
 219         }
 220         fsync_parent_dir(dst_name);
 221         lockfile_unlock(src_lock);
 222     }
 223
 224     lockfile_unlock(dst_lock);
 225 }
 226
 227 static void
 228 do_compact(int argc OVS_UNUSED, char *argv[])
 229 {
 230     compact_or_convert(argv[1], argv[2], NULL, "compacted by ovsdb-tool");
 231 }
 232
 233 static void
 234 do_convert(int argc OVS_UNUSED, char *argv[])
 235 {
 236     const char *schema_file_name = argv[2];
 237     struct ovsdb_schema *new_schema;
 238
 239     check_ovsdb_error(ovsdb_schema_from_file(schema_file_name, &new_schema));
 240     compact_or_convert(argv[1], argv[3], new_schema,
 241                        "converted by ovsdb-tool");
 242     ovsdb_schema_destroy(new_schema);
 243 }
 244
 245 static void
 246 transact(bool read_only, const char *db_file_name, const char *transaction)
 247 {
 248     struct json *request, *result;
 249     struct ovsdb *db;
 250
 251     check_ovsdb_error(ovsdb_file_open(db_file_name, read_only, &db, NULL));
 252
 253     request = parse_json(transaction);
 254     result = ovsdb_execute(db, request, 0, NULL);
 255     json_destroy(request);
 256
 257     print_and_free_json(result);
 258     ovsdb_destroy(db);
 259 }
 260
 261 static void
 262 do_query(int argc OVS_UNUSED, char *argv[])
 263 {
 264     transact(true, argv[1], argv[2]);
 265 }
 266
 267 static void
 268 do_transact(int argc OVS_UNUSED, char *argv[])
 269 {
 270     transact(false, argv[1], argv[2]);
 271 }
 272
 273 static void
 274 print_db_changes(struct shash *tables, struct shash *names)
 275 {
 276     struct shash_node *n1;
 277
 278     SHASH_FOR_EACH (n1, tables) {
 279         const char *table = n1->name;
 280         struct json *rows = n1->data;
 281         struct shash_node *n2;
 282
 283         if (n1->name[0] == '_' || rows->type != JSON_OBJECT) {
 284             continue;
 285         }
 286
 287         SHASH_FOR_EACH (n2, json_object(rows)) {
 288             const char *row_uuid = n2->name;
 289             struct json *columns = n2->data;
 290             struct shash_node *n3;
 291             char *old_name, *new_name;
 292             bool free_new_name = false;
 293
 294             old_name = new_name = shash_find_data(names, row_uuid);
 295             if (columns->type == JSON_OBJECT) {
 296                 struct json *new_name_json;
 297
 298                 new_name_json = shash_find_data(json_object(columns), "name");
 299                 if (new_name_json) {
 300                     new_name = json_to_string(new_name_json, JSSF_SORT);
 301                     free_new_name = true;
 302                 }
 303             }
 304
 305             printf("\ttable %s", table);
 306
 307             if (!old_name) {
 308                 if (new_name) {
 309                     printf(" insert row %s:\n", new_name);
 310                 } else {
 311                     printf(" insert row %.8s:\n", row_uuid);
 312                 }
 313             } else {
 314                 printf(" row %s:\n", old_name);
 315             }
 316
 317             if (columns->type == JSON_OBJECT) {
 318                 if (show_log_verbosity > 1) {
 319                     SHASH_FOR_EACH (n3, json_object(columns)) {
 320                         const char *column = n3->name;
 321                         struct json *value = n3->data;
 322                         char *value_string;
 323
 324                         value_string = json_to_string(value, JSSF_SORT);
 325                         printf("\t\t%s=%s\n", column, value_string);
 326                         free(value_string);
 327                     }
 328                 }
 329                 if (!old_name
 330                     || (new_name != old_name && strcmp(old_name, new_name))) {
 331                     if (old_name) {
 332                         shash_delete(names, shash_find(names, row_uuid));
 333                         free(old_name);
 334                     }
 335                     shash_add(names, row_uuid, (new_name
 336                                                 ? xstrdup(new_name)
 337                                                 : xmemdup0(row_uuid, 8)));
 338                 }
 339             } else if (columns->type == JSON_NULL) {
 340                 struct shash_node *node;
 341
 342                 printf("\t\tdelete row\n");
 343                 node = shash_find(names, row_uuid);
 344                 if (node) {
 345                     shash_delete(names, node);
 346                 }
 347                 free(old_name);
 348             }
 349
 350             if (free_new_name) {
 351                 free(new_name);
 352             }
 353         }
 354     }
 355 }
 356
 357 static void
 358 do_show_log(int argc OVS_UNUSED, char *argv[])
 359 {
 360     const char *db_file_name = argv[1];
 361     struct shash names;
 362     struct ovsdb_log *log;
 363     unsigned int i;
 364
 365     check_ovsdb_error(ovsdb_log_open(db_file_name, OVSDB_LOG_READ_ONLY,
 366                                      -1, &log));
 367     shash_init(&names);
 368     for (i = 0; ; i++) {
 369         struct json *json;
 370
 371         check_ovsdb_error(ovsdb_log_read(log, &json));
 372         if (!json) {
 373             break;
 374         }
 375
 376         printf("record %u:", i);
 377         if (json->type == JSON_OBJECT) {
 378             struct json *date, *comment;
 379
 380             date = shash_find_data(json_object(json), "_date");
 381             if (date && date->type == JSON_INTEGER) {
 382                 time_t t = json_integer(date);
 383                 char s[128];
 384
 385                 strftime(s, sizeof s, "%Y-%m-%d %H:%M:%S", localtime(&t));
 386                 printf(" %s", s);
 387             }
 388
 389             comment = shash_find_data(json_object(json), "_comment");
 390             if (comment && comment->type == JSON_STRING) {
 391                 printf(" \"%s\"", json_string(comment));
 392             }
 393
 394             if (i > 0 && show_log_verbosity > 0) {
 395                 putchar('\n');
 396                 print_db_changes(json_object(json), &names);
 397             }
 398         }
 399         json_destroy(json);
 400         putchar('\n');
 401     }
 402
 403     /* XXX free 'names'. */
 404 }
 405
 406 static void
 407 do_help(int argc OVS_UNUSED, char *argv[] OVS_UNUSED)
 408 {
 409     usage();
 410 }
 411
 412 static const struct command all_commands[] = {
 413     { "create", 2, 2, do_create },
 414     { "compact", 1, 2, do_compact },
 415     { "convert", 2, 3, do_convert },
 416     { "query", 2, 2, do_query },
 417     { "transact", 2, 2, do_transact },
 418     { "show-log", 1, 1, do_show_log },
 419     { "help", 0, INT_MAX, do_help },
 420     { NULL, 0, 0, NULL },
 421 };