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, conn->errbuf);
  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': %s",
  82                                 query, sdb_strbuf_string(conn->errbuf));
  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, conn->errbuf);
 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': %s", expr,
 202                                 sdb_strbuf_string(conn->errbuf));
 203                 return -1;
 204         }
 205
 206         node.type = type;
 207         m_node.matcher = m;
 208
 209         /* run analyzer separately; parse_matcher is missing
 210          * the right context to do so */
 211         if (sdb_fe_analyze(SDB_CONN_NODE(&node))) {
 212                 char expr[matcher_len + 1];
 213                 strncpy(expr, matcher, sizeof(expr));
 214                 expr[sizeof(expr) - 1] = '\0';
 215                 sdb_strbuf_sprintf(conn->errbuf, "Failed to verify "
 216                                 "lookup condition '%s'", expr);
 217                 status = -1;
 218         }
 219         else
 220                 status = sdb_fe_exec_lookup(conn, type, m, /* filter = */ NULL);
 221         sdb_object_deref(SDB_OBJ(m));
 222         return status;
 223 } /* sdb_fe_lookup */
 224
 225 int
 226 sdb_fe_exec(sdb_conn_t *conn, sdb_conn_node_t *node)
 227 {
 228         sdb_store_matcher_t *m = NULL, *filter = NULL;
 229
 230         if (! node)
 231                 return -1;
 232
 233         switch (node->cmd) {
 234                 case CONNECTION_FETCH:
 235                         if (CONN_FETCH(node)->filter)
 236                                 filter = CONN_FETCH(node)->filter->matcher;
 237                         return sdb_fe_exec_fetch(conn, CONN_FETCH(node)->type,
 238                                         CONN_FETCH(node)->host, CONN_FETCH(node)->name, filter);
 239                 case CONNECTION_LIST:
 240                         if (CONN_LIST(node)->filter)
 241                                 filter = CONN_LIST(node)->filter->matcher;
 242                         return sdb_fe_exec_list(conn, CONN_LIST(node)->type, filter);
 243                 case CONNECTION_LOOKUP:
 244                         if (CONN_LOOKUP(node)->matcher)
 245                                 m = CONN_LOOKUP(node)->matcher->matcher;
 246                         if (CONN_LOOKUP(node)->filter)
 247                                 filter = CONN_LOOKUP(node)->filter->matcher;
 248                         return sdb_fe_exec_lookup(conn,
 249                                         CONN_LOOKUP(node)->type, m, filter);
 250                 case CONNECTION_TIMESERIES:
 251                         return sdb_fe_exec_timeseries(conn,
 252                                         CONN_TS(node)->hostname, CONN_TS(node)->metric,
 253                                         &CONN_TS(node)->opts);
 254
 255                 default:
 256                         sdb_log(SDB_LOG_ERR, "frontend: Unknown command %i", node->cmd);
 257                         return -1;
 258         }
 259         return -1;
 260 } /* sdb_fe_exec */
 261
 262 int
 263 sdb_fe_exec_fetch(sdb_conn_t *conn, int type,
 264                 const char *hostname, const char *name, sdb_store_matcher_t *filter)
 265 {
 266         uint32_t res_type = htonl(CONNECTION_FETCH);
 267
 268         sdb_store_obj_t *host;
 269         sdb_store_obj_t *obj;
 270
 271         sdb_store_json_formatter_t *f;
 272         sdb_strbuf_t *buf;
 273
 274         if ((! hostname) || ((type == SDB_HOST) && name)
 275                         || ((type != SDB_HOST) && (! name))) {
 276                 /* This is a programming error, not something the client did wrong */
 277                 sdb_strbuf_sprintf(conn->errbuf, "INTERNAL ERROR: invalid "
 278                                 "arguments to sdb_fe_exec_fetch(%s, %s, %s)",
 279                                 SDB_STORE_TYPE_TO_NAME(type), hostname, name);
 280                 return -1;
 281         }
 282
 283         host = sdb_store_get_host(hostname);
 284         if ((! host) || (filter
 285                                 && (! sdb_store_matcher_matches(filter, host, NULL)))) {
 286                 sdb_strbuf_sprintf(conn->errbuf, "Failed to fetch %s %s: "
 287                                 "host %s not found", SDB_STORE_TYPE_TO_NAME(type),
 288                                 name, hostname);
 289                 return -1;
 290         }
 291         if (type == SDB_HOST) {
 292                 obj = host;
 293         }
 294         else {
 295                 obj = sdb_store_get_child(host, type, name);
 296                 if ((! obj) || (filter
 297                                         && (! sdb_store_matcher_matches(filter, obj, NULL)))) {
 298                         sdb_strbuf_sprintf(conn->errbuf, "Failed to fetch %s %s.%s: "
 299                                         "%s not found", SDB_STORE_TYPE_TO_NAME(type),
 300                                         hostname, name, name);
 301                         return -1;
 302                 }
 303                 sdb_object_deref(SDB_OBJ(host));
 304         }
 305
 306         buf = sdb_strbuf_create(1024);
 307         if (! buf) {
 308                 char errbuf[1024];
 309                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 310                                 "buffer to handle FETCH command: %s",
 311                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 312
 313                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 314                 sdb_strbuf_destroy(buf);
 315                 sdb_object_deref(SDB_OBJ(obj));
 316                 return -1;
 317         }
 318         f = sdb_store_json_formatter(buf, type, /* flags = */ 0);
 319         if (! f) {
 320                 char errbuf[1024];
 321                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 322                                 "JSON formatter to handle FETCH command: %s",
 323                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 324
 325                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 326                 sdb_strbuf_destroy(buf);
 327                 sdb_object_deref(SDB_OBJ(obj));
 328                 return -1;
 329         }
 330
 331         sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
 332         if (sdb_store_json_emit_full(f, obj, filter)) {
 333                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 334                                 "%s %s.%s to JSON", SDB_STORE_TYPE_TO_NAME(type),
 335                                 hostname, name);
 336                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 337                 sdb_strbuf_destroy(buf);
 338                 free(f);
 339                 sdb_object_deref(SDB_OBJ(obj));
 340                 return -1;
 341         }
 342         sdb_store_json_finish(f);
 343
 344         sdb_connection_send(conn, CONNECTION_DATA,
 345                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 346         sdb_strbuf_destroy(buf);
 347         free(f);
 348         sdb_object_deref(SDB_OBJ(obj));
 349         return 0;
 350 } /* sdb_fe_exec_fetch */
 351
 352 int
 353 sdb_fe_exec_list(sdb_conn_t *conn, int type, sdb_store_matcher_t *filter)
 354 {
 355         uint32_t res_type = htonl(CONNECTION_LIST);
 356
 357         sdb_store_json_formatter_t *f;
 358         sdb_strbuf_t *buf;
 359
 360         buf = sdb_strbuf_create(1024);
 361         if (! buf) {
 362                 char errbuf[1024];
 363                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 364                                 "buffer to handle LIST command: %s",
 365                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 366
 367                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 368                 sdb_strbuf_destroy(buf);
 369                 return -1;
 370         }
 371         f = sdb_store_json_formatter(buf, type, SDB_WANT_ARRAY);
 372         if (! f) {
 373                 char errbuf[1024];
 374                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 375                                 "JSON formatter to handle LIST command: %s",
 376                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 377
 378                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 379                 sdb_strbuf_destroy(buf);
 380                 return -1;
 381         }
 382
 383         sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
 384         if (sdb_store_scan(type, /* m = */ NULL, filter, list_tojson, f)) {
 385                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 386                                 "store to JSON");
 387                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 388                 sdb_strbuf_destroy(buf);
 389                 free(f);
 390                 return -1;
 391         }
 392         sdb_store_json_finish(f);
 393
 394         sdb_connection_send(conn, CONNECTION_DATA,
 395                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 396         sdb_strbuf_destroy(buf);
 397         free(f);
 398         return 0;
 399 } /* sdb_fe_exec_list */
 400
 401 int
 402 sdb_fe_exec_lookup(sdb_conn_t *conn, int type,
 403                 sdb_store_matcher_t *m, sdb_store_matcher_t *filter)
 404 {
 405         uint32_t res_type = htonl(CONNECTION_LOOKUP);
 406
 407         sdb_store_json_formatter_t *f;
 408         sdb_strbuf_t *buf;
 409
 410         /* XXX: support other types */
 411         if (type != SDB_HOST) {
 412                 sdb_log(SDB_LOG_ERR, "frontend: Invalid object type %d "
 413                                 "in LOOKUP command", type);
 414                 sdb_strbuf_sprintf(conn->errbuf,
 415                                 "LOOKUP: Invalid object type %d", type);
 416                 return -1;
 417         }
 418
 419         buf = sdb_strbuf_create(1024);
 420         if (! buf) {
 421                 char errbuf[1024];
 422                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 423                                 "buffer to handle LOOKUP command: %s",
 424                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 425
 426                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 427                 return -1;
 428         }
 429         f = sdb_store_json_formatter(buf, type, SDB_WANT_ARRAY);
 430         if (! f) {
 431                 char errbuf[1024];
 432                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 433                                 "JSON formatter to handle LOOKUP command: %s",
 434                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 435
 436                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 437                 sdb_strbuf_destroy(buf);
 438                 return -1;
 439         }
 440
 441         sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
 442
 443         if (sdb_store_scan(SDB_HOST, m, filter, lookup_tojson, f)) {
 444                 sdb_log(SDB_LOG_ERR, "frontend: Failed to lookup hosts");
 445                 sdb_strbuf_sprintf(conn->errbuf, "Failed to lookup hosts");
 446                 sdb_strbuf_destroy(buf);
 447                 free(f);
 448                 return -1;
 449         }
 450         sdb_store_json_finish(f);
 451
 452         sdb_connection_send(conn, CONNECTION_DATA,
 453                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 454         sdb_strbuf_destroy(buf);
 455         free(f);
 456         return 0;
 457 } /* sdb_fe_exec_lookup */
 458
 459 int
 460 sdb_fe_exec_timeseries(sdb_conn_t *conn,
 461                 const char *hostname, const char *metric,
 462                 sdb_timeseries_opts_t *opts)
 463 {
 464         sdb_strbuf_t *buf;
 465         uint32_t res_type = htonl(CONNECTION_TIMESERIES);
 466
 467         buf = sdb_strbuf_create(1024);
 468         if (! buf) {
 469                 char errbuf[1024];
 470                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 471                                 "buffer to handle TIMESERIES command: %s",
 472                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 473
 474                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 475                 return -1;
 476         }
 477
 478         sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
 479         if (sdb_store_fetch_timeseries(hostname, metric, opts, buf)) {
 480                 sdb_log(SDB_LOG_ERR, "frontend: Failed to fetch time-series");
 481                 sdb_strbuf_sprintf(conn->errbuf, "Failed to fetch time-series");
 482                 sdb_strbuf_destroy(buf);
 483                 return -1;
 484         }
 485
 486         sdb_connection_send(conn, CONNECTION_DATA,
 487                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 488         sdb_strbuf_destroy(buf);
 489         return 0;
 490 } /* sdb_fe_exec_timeseries */
 491
 492 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 493