src/frontend/query.c

   1 /*
   2  * SysDB - src/frontend/query.c
   3  * Copyright (C) 2013-2014 Sebastian 'tokkee' Harl <sh@tokkee.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  16  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  17  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  18  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
  19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "sysdb.h"
  29
  30 #include "core/store.h"
  31 #include "frontend/connection-private.h"
  32 #include "frontend/parser.h"
  33 #include "utils/error.h"
  34 #include "utils/proto.h"
  35 #include "utils/strbuf.h"
  36
  37 #include <errno.h>
  38 #include <string.h>
  39
  40 /*
  41  * private helper functions
  42  */
  43
  44 static int
  45 list_tojson(sdb_store_obj_t *obj,
  46                 sdb_store_matcher_t __attribute__((unused)) *filter,
  47                 void *user_data)
  48 {
  49         sdb_store_json_formatter_t *f = user_data;
  50         return sdb_store_json_emit(f, obj);
  51 } /* list_tojson */
  52
  53 static int
  54 lookup_tojson(sdb_store_obj_t *obj, sdb_store_matcher_t *filter,
  55                 void *user_data)
  56 {
  57         sdb_store_json_formatter_t *f = user_data;
  58         return sdb_store_json_emit_full(f, obj, filter);
  59 } /* lookup_tojson */
  60
  61 /*
  62  * public API
  63  */
  64
  65 int
  66 sdb_fe_query(sdb_conn_t *conn)
  67 {
  68         sdb_llist_t *parsetree;
  69         sdb_conn_node_t *node = NULL;
  70         int status = 0;
  71
  72         if ((! conn) || (conn->cmd != CONNECTION_QUERY))
  73                 return -1;
  74
  75         parsetree = sdb_fe_parse(sdb_strbuf_string(conn->buf),
  76                         (int)conn->cmd_len);
  77         if (! parsetree) {
  78                 char query[conn->cmd_len + 1];
  79                 strncpy(query, sdb_strbuf_string(conn->buf), conn->cmd_len);
  80                 query[sizeof(query) - 1] = '\0';
  81                 sdb_log(SDB_LOG_ERR, "frontend: Failed to parse query '%s'",
  82                                 query);
  83                 return -1;
  84         }
  85
  86         switch (sdb_llist_len(parsetree)) {
  87                 case 0:
  88                         /* skipping empty command; send back an empty reply */
  89                         sdb_connection_send(conn, CONNECTION_DATA, 0, NULL);
  90                         break;
  91                 case 1:
  92                         node = SDB_CONN_NODE(sdb_llist_get(parsetree, 0));
  93                         break;
  94
  95                 default:
  96                         {
  97                                 char query[conn->cmd_len + 1];
  98                                 strncpy(query, sdb_strbuf_string(conn->buf), conn->cmd_len);
  99                                 query[sizeof(query) - 1] = '\0';
 100                                 sdb_log(SDB_LOG_WARNING, "frontend: Ignoring %zu command%s "
 101                                                 "in multi-statement query '%s'",
 102                                                 sdb_llist_len(parsetree) - 1,
 103                                                 sdb_llist_len(parsetree) == 2 ? "" : "s",
 104                                                 query);
 105                                 node = SDB_CONN_NODE(sdb_llist_get(parsetree, 0));
 106                         }
 107         }
 108
 109         if (node) {
 110                 status = sdb_fe_exec(conn, node);
 111                 sdb_object_deref(SDB_OBJ(node));
 112         }
 113
 114         sdb_llist_destroy(parsetree);
 115         return status;
 116 } /* sdb_fe_query */
 117
 118 int
 119 sdb_fe_fetch(sdb_conn_t *conn)
 120 {
 121         char name[conn->cmd_len + 1];
 122         int type;
 123
 124         if ((! conn) || (conn->cmd != CONNECTION_FETCH))
 125                 return -1;
 126
 127         if (conn->cmd_len < sizeof(uint32_t)) {
 128                 sdb_log(SDB_LOG_ERR, "frontend: Invalid command length %d for "
 129                                 "FETCH command", conn->cmd_len);
 130                 sdb_strbuf_sprintf(conn->errbuf, "FETCH: Invalid command length %d",
 131                                 conn->cmd_len);
 132                 return -1;
 133         }
 134
 135         type = sdb_proto_get_int(conn->buf, 0);
 136         strncpy(name, sdb_strbuf_string(conn->buf) + sizeof(uint32_t),
 137                         conn->cmd_len - sizeof(uint32_t));
 138         name[sizeof(name) - 1] = '\0';
 139         /* TODO: support other types besides hosts */
 140         return sdb_fe_exec_fetch(conn, type, name, NULL, /* filter = */ NULL);
 141 } /* sdb_fe_fetch */
 142
 143 int
 144 sdb_fe_list(sdb_conn_t *conn)
 145 {
 146         int type = SDB_HOST;
 147
 148         if ((! conn) || (conn->cmd != CONNECTION_LIST))
 149                 return -1;
 150
 151         if (conn->cmd_len == sizeof(uint32_t))
 152                 type = sdb_proto_get_int(conn->buf, 0);
 153         else if (conn->cmd_len) {
 154                 sdb_log(SDB_LOG_ERR, "frontend: Invalid command length %d for "
 155                                 "LIST command", conn->cmd_len);
 156                 sdb_strbuf_sprintf(conn->errbuf, "LIST: Invalid command length %d",
 157                                 conn->cmd_len);
 158                 return -1;
 159         }
 160         return sdb_fe_exec_list(conn, type, /* filter = */ NULL);
 161 } /* sdb_fe_list */
 162
 163 int
 164 sdb_fe_lookup(sdb_conn_t *conn)
 165 {
 166         sdb_store_matcher_t *m;
 167         const char *matcher;
 168         size_t matcher_len;
 169
 170         int type;
 171         int status;
 172
 173         conn_matcher_t m_node = {
 174                 { SDB_OBJECT_INIT, CONNECTION_MATCHER }, NULL
 175         };
 176         conn_lookup_t node = {
 177                 { SDB_OBJECT_INIT, CONNECTION_LOOKUP },
 178                 -1, &m_node, NULL
 179         };
 180
 181         if ((! conn) || (conn->cmd != CONNECTION_LOOKUP))
 182                 return -1;
 183
 184         if (conn->cmd_len < sizeof(uint32_t)) {
 185                 sdb_log(SDB_LOG_ERR, "frontend: Invalid command length %d for "
 186                                 "LOOKUP command", conn->cmd_len);
 187                 sdb_strbuf_sprintf(conn->errbuf, "LOOKUP: Invalid command length %d",
 188                                 conn->cmd_len);
 189                 return -1;
 190         }
 191         type = sdb_proto_get_int(conn->buf, 0);
 192
 193         matcher = sdb_strbuf_string(conn->buf) + sizeof(uint32_t);
 194         matcher_len = conn->cmd_len - sizeof(uint32_t);
 195         m = sdb_fe_parse_matcher(matcher, (int)matcher_len);
 196         if (! m) {
 197                 char expr[matcher_len + 1];
 198                 strncpy(expr, matcher, sizeof(expr));
 199                 expr[sizeof(expr) - 1] = '\0';
 200                 sdb_log(SDB_LOG_ERR, "frontend: Failed to parse "
 201                                 "lookup condition '%s'", expr);
 202                 return -1;
 203         }
 204
 205         node.type = type;
 206         m_node.matcher = m;
 207
 208         /* run analyzer separately; parse_matcher is missing
 209          * the right context to do so */
 210         if (sdb_fe_analyze(SDB_CONN_NODE(&node))) {
 211                 char expr[matcher_len + 1];
 212                 strncpy(expr, matcher, sizeof(expr));
 213                 expr[sizeof(expr) - 1] = '\0';
 214                 sdb_log(SDB_LOG_ERR, "frontend: Failed to verify "
 215                                 "lookup condition '%s'", expr);
 216                 status = -1;
 217         }
 218         else
 219                 status = sdb_fe_exec_lookup(conn, type, m, /* filter = */ NULL);
 220         sdb_object_deref(SDB_OBJ(m));
 221         return status;
 222 } /* sdb_fe_lookup */
 223
 224 int
 225 sdb_fe_exec(sdb_conn_t *conn, sdb_conn_node_t *node)
 226 {
 227         sdb_store_matcher_t *m = NULL, *filter = NULL;
 228
 229         if (! node)
 230                 return -1;
 231
 232         switch (node->cmd) {
 233                 case CONNECTION_FETCH:
 234                         if (CONN_FETCH(node)->filter)
 235                                 filter = CONN_FETCH(node)->filter->matcher;
 236                         return sdb_fe_exec_fetch(conn, CONN_FETCH(node)->type,
 237                                         CONN_FETCH(node)->host, CONN_FETCH(node)->name, filter);
 238                 case CONNECTION_LIST:
 239                         if (CONN_LIST(node)->filter)
 240                                 filter = CONN_LIST(node)->filter->matcher;
 241                         return sdb_fe_exec_list(conn, CONN_LIST(node)->type, filter);
 242                 case CONNECTION_LOOKUP:
 243                         if (CONN_LOOKUP(node)->matcher)
 244                                 m = CONN_LOOKUP(node)->matcher->matcher;
 245                         if (CONN_LOOKUP(node)->filter)
 246                                 filter = CONN_LOOKUP(node)->filter->matcher;
 247                         return sdb_fe_exec_lookup(conn,
 248                                         CONN_LOOKUP(node)->type, m, filter);
 249                 case CONNECTION_TIMESERIES:
 250                         return sdb_fe_exec_timeseries(conn,
 251                                         CONN_TS(node)->hostname, CONN_TS(node)->metric,
 252                                         &CONN_TS(node)->opts);
 253
 254                 default:
 255                         sdb_log(SDB_LOG_ERR, "frontend: Unknown command %i", node->cmd);
 256                         return -1;
 257         }
 258         return -1;
 259 } /* sdb_fe_exec */
 260
 261 int
 262 sdb_fe_exec_fetch(sdb_conn_t *conn, int type,
 263                 const char *hostname, const char *name, sdb_store_matcher_t *filter)
 264 {
 265         uint32_t res_type = htonl(CONNECTION_FETCH);
 266
 267         sdb_store_obj_t *host;
 268         sdb_store_obj_t *obj;
 269
 270         sdb_store_json_formatter_t *f;
 271         sdb_strbuf_t *buf;
 272
 273         if ((! hostname) || ((type == SDB_HOST) && name)
 274                         || ((type != SDB_HOST) && (! name))) {
 275                 /* This is a programming error, not something the client did wrong */
 276                 sdb_strbuf_sprintf(conn->errbuf, "INTERNAL ERROR: invalid "
 277                                 "arguments to sdb_fe_exec_fetch(%s, %s, %s)",
 278                                 SDB_STORE_TYPE_TO_NAME(type), hostname, name);
 279                 return -1;
 280         }
 281
 282         host = sdb_store_get_host(hostname);
 283         if ((! host) || (filter
 284                                 && (! sdb_store_matcher_matches(filter, host, NULL)))) {
 285                 sdb_strbuf_sprintf(conn->errbuf, "Failed to fetch %s %s: "
 286                                 "host %s not found", SDB_STORE_TYPE_TO_NAME(type),
 287                                 name, hostname);
 288                 return -1;
 289         }
 290         if (type == SDB_HOST) {
 291                 obj = host;
 292         }
 293         else {
 294                 obj = sdb_store_get_child(host, type, name);
 295                 if ((! obj) || (filter
 296                                         && (! sdb_store_matcher_matches(filter, obj, NULL)))) {
 297                         sdb_strbuf_sprintf(conn->errbuf, "Failed to fetch %s %s.%s: "
 298                                         "%s not found", SDB_STORE_TYPE_TO_NAME(type),
 299                                         hostname, name, name);
 300                         return -1;
 301                 }
 302                 sdb_object_deref(SDB_OBJ(host));
 303         }
 304
 305         buf = sdb_strbuf_create(1024);
 306         if (! buf) {
 307                 char errbuf[1024];
 308                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 309                                 "buffer to handle FETCH command: %s",
 310                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 311
 312                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 313                 sdb_strbuf_destroy(buf);
 314                 sdb_object_deref(SDB_OBJ(obj));
 315                 return -1;
 316         }
 317         f = sdb_store_json_formatter(buf, type, /* flags = */ 0);
 318         if (! f) {
 319                 char errbuf[1024];
 320                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 321                                 "JSON formatter to handle FETCH command: %s",
 322                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 323
 324                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 325                 sdb_strbuf_destroy(buf);
 326                 sdb_object_deref(SDB_OBJ(obj));
 327                 return -1;
 328         }
 329
 330         sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
 331         if (sdb_store_json_emit_full(f, obj, filter)) {
 332                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 333                                 "%s %s.%s to JSON", SDB_STORE_TYPE_TO_NAME(type),
 334                                 hostname, name);
 335                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 336                 sdb_strbuf_destroy(buf);
 337                 free(f);
 338                 sdb_object_deref(SDB_OBJ(obj));
 339                 return -1;
 340         }
 341         sdb_store_json_finish(f);
 342
 343         sdb_connection_send(conn, CONNECTION_DATA,
 344                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 345         sdb_strbuf_destroy(buf);
 346         free(f);
 347         sdb_object_deref(SDB_OBJ(obj));
 348         return 0;
 349 } /* sdb_fe_exec_fetch */
 350
 351 int
 352 sdb_fe_exec_list(sdb_conn_t *conn, int type, sdb_store_matcher_t *filter)
 353 {
 354         uint32_t res_type = htonl(CONNECTION_LIST);
 355
 356         sdb_store_json_formatter_t *f;
 357         sdb_strbuf_t *buf;
 358
 359         buf = sdb_strbuf_create(1024);
 360         if (! buf) {
 361                 char errbuf[1024];
 362                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 363                                 "buffer to handle LIST command: %s",
 364                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 365
 366                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 367                 sdb_strbuf_destroy(buf);
 368                 return -1;
 369         }
 370         f = sdb_store_json_formatter(buf, type, SDB_WANT_ARRAY);
 371         if (! f) {
 372                 char errbuf[1024];
 373                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 374                                 "JSON formatter to handle LIST command: %s",
 375                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 376
 377                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 378                 sdb_strbuf_destroy(buf);
 379                 return -1;
 380         }
 381
 382         sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
 383         if (sdb_store_scan(type, /* m = */ NULL, filter, list_tojson, f)) {
 384                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 385                                 "store to JSON");
 386                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 387                 sdb_strbuf_destroy(buf);
 388                 free(f);
 389                 return -1;
 390         }
 391         sdb_store_json_finish(f);
 392
 393         sdb_connection_send(conn, CONNECTION_DATA,
 394                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 395         sdb_strbuf_destroy(buf);
 396         free(f);
 397         return 0;
 398 } /* sdb_fe_exec_list */
 399
 400 int
 401 sdb_fe_exec_lookup(sdb_conn_t *conn, int type,
 402                 sdb_store_matcher_t *m, sdb_store_matcher_t *filter)
 403 {
 404         uint32_t res_type = htonl(CONNECTION_LOOKUP);
 405
 406         sdb_store_json_formatter_t *f;
 407         sdb_strbuf_t *buf;
 408
 409         /* XXX: support other types */
 410         if (type != SDB_HOST) {
 411                 sdb_log(SDB_LOG_ERR, "frontend: Invalid object type %d "
 412                                 "in LOOKUP command", type);
 413                 sdb_strbuf_sprintf(conn->errbuf,
 414                                 "LOOKUP: Invalid object type %d", type);
 415                 return -1;
 416         }
 417
 418         buf = sdb_strbuf_create(1024);
 419         if (! buf) {
 420                 char errbuf[1024];
 421                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 422                                 "buffer to handle LOOKUP command: %s",
 423                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 424
 425                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 426                 return -1;
 427         }
 428         f = sdb_store_json_formatter(buf, type, SDB_WANT_ARRAY);
 429         if (! f) {
 430                 char errbuf[1024];
 431                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 432                                 "JSON formatter to handle LOOKUP command: %s",
 433                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 434
 435                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 436                 sdb_strbuf_destroy(buf);
 437                 return -1;
 438         }
 439
 440         sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
 441
 442         if (sdb_store_scan(SDB_HOST, m, filter, lookup_tojson, f)) {
 443                 sdb_log(SDB_LOG_ERR, "frontend: Failed to lookup hosts");
 444                 sdb_strbuf_sprintf(conn->errbuf, "Failed to lookup hosts");
 445                 sdb_strbuf_destroy(buf);
 446                 free(f);
 447                 return -1;
 448         }
 449         sdb_store_json_finish(f);
 450
 451         sdb_connection_send(conn, CONNECTION_DATA,
 452                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 453         sdb_strbuf_destroy(buf);
 454         free(f);
 455         return 0;
 456 } /* sdb_fe_exec_lookup */
 457
 458 int
 459 sdb_fe_exec_timeseries(sdb_conn_t *conn,
 460                 const char *hostname, const char *metric,
 461                 sdb_timeseries_opts_t *opts)
 462 {
 463         sdb_strbuf_t *buf;
 464         uint32_t res_type = htonl(CONNECTION_TIMESERIES);
 465
 466         buf = sdb_strbuf_create(1024);
 467         if (! buf) {
 468                 char errbuf[1024];
 469                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 470                                 "buffer to handle TIMESERIES command: %s",
 471                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 472
 473                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 474                 return -1;
 475         }
 476
 477         sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
 478         if (sdb_store_fetch_timeseries(hostname, metric, opts, buf)) {
 479                 sdb_log(SDB_LOG_ERR, "frontend: Failed to fetch time-series");
 480                 sdb_strbuf_sprintf(conn->errbuf, "Failed to fetch time-series");
 481                 sdb_strbuf_destroy(buf);
 482                 return -1;
 483         }
 484
 485         sdb_connection_send(conn, CONNECTION_DATA,
 486                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 487         sdb_strbuf_destroy(buf);
 488         return 0;
 489 } /* sdb_fe_exec_timeseries */
 490
 491 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 492