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                 if (sdb_fe_analyze(node)) {
 111                         char query[conn->cmd_len + 1];
 112                         strncpy(query, sdb_strbuf_string(conn->buf), conn->cmd_len);
 113                         query[sizeof(query) - 1] = '\0';
 114                         sdb_log(SDB_LOG_ERR, "frontend: Failed to verify query '%s'",
 115                                         query);
 116                         status = -1;
 117                 }
 118                 else
 119                         status = sdb_fe_exec(conn, node);
 120                 sdb_object_deref(SDB_OBJ(node));
 121         }
 122
 123         sdb_llist_destroy(parsetree);
 124         return status;
 125 } /* sdb_fe_query */
 126
 127 int
 128 sdb_fe_fetch(sdb_conn_t *conn)
 129 {
 130         char name[conn->cmd_len + 1];
 131         int type;
 132
 133         if ((! conn) || (conn->cmd != CONNECTION_FETCH))
 134                 return -1;
 135
 136         if (conn->cmd_len < sizeof(uint32_t)) {
 137                 sdb_log(SDB_LOG_ERR, "frontend: Invalid command length %d for "
 138                                 "FETCH command", conn->cmd_len);
 139                 sdb_strbuf_sprintf(conn->errbuf, "FETCH: Invalid command length %d",
 140                                 conn->cmd_len);
 141                 return -1;
 142         }
 143
 144         type = sdb_proto_get_int(conn->buf, 0);
 145         strncpy(name, sdb_strbuf_string(conn->buf) + sizeof(uint32_t),
 146                         conn->cmd_len - sizeof(uint32_t));
 147         name[sizeof(name) - 1] = '\0';
 148         /* TODO: support other types besides hosts */
 149         return sdb_fe_exec_fetch(conn, type, name, NULL, /* filter = */ NULL);
 150 } /* sdb_fe_fetch */
 151
 152 int
 153 sdb_fe_list(sdb_conn_t *conn)
 154 {
 155         int type = SDB_HOST;
 156
 157         if ((! conn) || (conn->cmd != CONNECTION_LIST))
 158                 return -1;
 159
 160         if (conn->cmd_len == sizeof(uint32_t))
 161                 type = sdb_proto_get_int(conn->buf, 0);
 162         else if (conn->cmd_len) {
 163                 sdb_log(SDB_LOG_ERR, "frontend: Invalid command length %d for "
 164                                 "LIST command", conn->cmd_len);
 165                 sdb_strbuf_sprintf(conn->errbuf, "LIST: Invalid command length %d",
 166                                 conn->cmd_len);
 167                 return -1;
 168         }
 169         return sdb_fe_exec_list(conn, type, /* filter = */ NULL);
 170 } /* sdb_fe_list */
 171
 172 int
 173 sdb_fe_lookup(sdb_conn_t *conn)
 174 {
 175         sdb_store_matcher_t *m;
 176         const char *matcher;
 177         size_t matcher_len;
 178
 179         int type;
 180         int status;
 181
 182         conn_matcher_t m_node = {
 183                 { SDB_OBJECT_INIT, CONNECTION_MATCHER }, NULL
 184         };
 185         conn_lookup_t node = {
 186                 { SDB_OBJECT_INIT, CONNECTION_LOOKUP },
 187                 -1, &m_node, NULL
 188         };
 189
 190         if ((! conn) || (conn->cmd != CONNECTION_LOOKUP))
 191                 return -1;
 192
 193         if (conn->cmd_len < sizeof(uint32_t)) {
 194                 sdb_log(SDB_LOG_ERR, "frontend: Invalid command length %d for "
 195                                 "LOOKUP command", conn->cmd_len);
 196                 sdb_strbuf_sprintf(conn->errbuf, "LOOKUP: Invalid command length %d",
 197                                 conn->cmd_len);
 198                 return -1;
 199         }
 200         type = sdb_proto_get_int(conn->buf, 0);
 201
 202         matcher = sdb_strbuf_string(conn->buf) + sizeof(uint32_t);
 203         matcher_len = conn->cmd_len - sizeof(uint32_t);
 204         m = sdb_fe_parse_matcher(matcher, (int)matcher_len);
 205         if (! m) {
 206                 char expr[matcher_len + 1];
 207                 strncpy(expr, matcher, sizeof(expr));
 208                 expr[sizeof(expr) - 1] = '\0';
 209                 sdb_log(SDB_LOG_ERR, "frontend: Failed to parse "
 210                                 "lookup condition '%s'", expr);
 211                 return -1;
 212         }
 213
 214         node.type = type;
 215         m_node.matcher = m;
 216
 217         if (sdb_fe_analyze(SDB_CONN_NODE(&node))) {
 218                 char expr[matcher_len + 1];
 219                 strncpy(expr, matcher, sizeof(expr));
 220                 expr[sizeof(expr) - 1] = '\0';
 221                 sdb_log(SDB_LOG_ERR, "frontend: Failed to verify "
 222                                 "lookup condition '%s'", expr);
 223                 status = -1;
 224         }
 225         else
 226                 status = sdb_fe_exec_lookup(conn, type, m, /* filter = */ NULL);
 227         sdb_object_deref(SDB_OBJ(m));
 228         return status;
 229 } /* sdb_fe_lookup */
 230
 231 int
 232 sdb_fe_exec(sdb_conn_t *conn, sdb_conn_node_t *node)
 233 {
 234         sdb_store_matcher_t *m = NULL, *filter = NULL;
 235
 236         if (! node)
 237                 return -1;
 238
 239         switch (node->cmd) {
 240                 case CONNECTION_FETCH:
 241                         if (CONN_FETCH(node)->filter)
 242                                 filter = CONN_FETCH(node)->filter->matcher;
 243                         return sdb_fe_exec_fetch(conn, CONN_FETCH(node)->type,
 244                                         CONN_FETCH(node)->host, CONN_FETCH(node)->name, filter);
 245                 case CONNECTION_LIST:
 246                         if (CONN_LIST(node)->filter)
 247                                 filter = CONN_LIST(node)->filter->matcher;
 248                         return sdb_fe_exec_list(conn, CONN_LIST(node)->type, filter);
 249                 case CONNECTION_LOOKUP:
 250                         if (CONN_LOOKUP(node)->matcher)
 251                                 m = CONN_LOOKUP(node)->matcher->matcher;
 252                         if (CONN_LOOKUP(node)->filter)
 253                                 filter = CONN_LOOKUP(node)->filter->matcher;
 254                         return sdb_fe_exec_lookup(conn,
 255                                         CONN_LOOKUP(node)->type, m, filter);
 256                 case CONNECTION_TIMESERIES:
 257                         return sdb_fe_exec_timeseries(conn,
 258                                         CONN_TS(node)->hostname, CONN_TS(node)->metric,
 259                                         &CONN_TS(node)->opts);
 260
 261                 default:
 262                         sdb_log(SDB_LOG_ERR, "frontend: Unknown command %i", node->cmd);
 263                         return -1;
 264         }
 265         return -1;
 266 } /* sdb_fe_exec */
 267
 268 int
 269 sdb_fe_exec_fetch(sdb_conn_t *conn, int type,
 270                 const char *hostname, const char *name, sdb_store_matcher_t *filter)
 271 {
 272         uint32_t res_type = htonl(CONNECTION_FETCH);
 273
 274         sdb_store_obj_t *host;
 275         sdb_store_obj_t *obj;
 276
 277         sdb_store_json_formatter_t *f;
 278         sdb_strbuf_t *buf;
 279
 280         if ((! hostname) || ((type == SDB_HOST) && name)
 281                         || ((type != SDB_HOST) && (! name))) {
 282                 /* This is a programming error, not something the client did wrong */
 283                 sdb_strbuf_sprintf(conn->errbuf, "INTERNAL ERROR: invalid "
 284                                 "arguments to sdb_fe_exec_fetch(%s, %s, %s)",
 285                                 SDB_STORE_TYPE_TO_NAME(type), hostname, name);
 286                 return -1;
 287         }
 288
 289         host = sdb_store_get_host(hostname);
 290         if ((! host) || (filter
 291                                 && (! sdb_store_matcher_matches(filter, host, NULL)))) {
 292                 sdb_strbuf_sprintf(conn->errbuf, "Failed to fetch %s %s: "
 293                                 "host %s not found", SDB_STORE_TYPE_TO_NAME(type),
 294                                 name, hostname);
 295                 return -1;
 296         }
 297         if (type == SDB_HOST) {
 298                 obj = host;
 299         }
 300         else {
 301                 obj = sdb_store_get_child(host, type, name);
 302                 if ((! obj) || (filter
 303                                         && (! sdb_store_matcher_matches(filter, obj, NULL)))) {
 304                         sdb_strbuf_sprintf(conn->errbuf, "Failed to fetch %s %s.%s: "
 305                                         "%s not found", SDB_STORE_TYPE_TO_NAME(type),
 306                                         hostname, name, name);
 307                         return -1;
 308                 }
 309                 sdb_object_deref(SDB_OBJ(host));
 310         }
 311
 312         buf = sdb_strbuf_create(1024);
 313         if (! buf) {
 314                 char errbuf[1024];
 315                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 316                                 "buffer to handle FETCH command: %s",
 317                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 318
 319                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 320                 sdb_strbuf_destroy(buf);
 321                 sdb_object_deref(SDB_OBJ(obj));
 322                 return -1;
 323         }
 324         f = sdb_store_json_formatter(buf, type, /* flags = */ 0);
 325         if (! f) {
 326                 char errbuf[1024];
 327                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 328                                 "JSON formatter to handle FETCH command: %s",
 329                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 330
 331                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 332                 sdb_strbuf_destroy(buf);
 333                 sdb_object_deref(SDB_OBJ(obj));
 334                 return -1;
 335         }
 336
 337         sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
 338         if (sdb_store_json_emit_full(f, obj, filter)) {
 339                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 340                                 "%s %s.%s to JSON", SDB_STORE_TYPE_TO_NAME(type),
 341                                 hostname, name);
 342                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 343                 sdb_strbuf_destroy(buf);
 344                 free(f);
 345                 sdb_object_deref(SDB_OBJ(obj));
 346                 return -1;
 347         }
 348         sdb_store_json_finish(f);
 349
 350         sdb_connection_send(conn, CONNECTION_DATA,
 351                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 352         sdb_strbuf_destroy(buf);
 353         free(f);
 354         sdb_object_deref(SDB_OBJ(obj));
 355         return 0;
 356 } /* sdb_fe_exec_fetch */
 357
 358 int
 359 sdb_fe_exec_list(sdb_conn_t *conn, int type, sdb_store_matcher_t *filter)
 360 {
 361         uint32_t res_type = htonl(CONNECTION_LIST);
 362
 363         sdb_store_json_formatter_t *f;
 364         sdb_strbuf_t *buf;
 365
 366         buf = sdb_strbuf_create(1024);
 367         if (! buf) {
 368                 char errbuf[1024];
 369                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 370                                 "buffer to handle LIST command: %s",
 371                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 372
 373                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 374                 sdb_strbuf_destroy(buf);
 375                 return -1;
 376         }
 377         f = sdb_store_json_formatter(buf, type, SDB_WANT_ARRAY);
 378         if (! f) {
 379                 char errbuf[1024];
 380                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 381                                 "JSON formatter to handle LIST command: %s",
 382                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 383
 384                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 385                 sdb_strbuf_destroy(buf);
 386                 return -1;
 387         }
 388
 389         sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
 390         if (sdb_store_scan(type, /* m = */ NULL, filter, list_tojson, f)) {
 391                 sdb_log(SDB_LOG_ERR, "frontend: Failed to serialize "
 392                                 "store to JSON");
 393                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 394                 sdb_strbuf_destroy(buf);
 395                 free(f);
 396                 return -1;
 397         }
 398         sdb_store_json_finish(f);
 399
 400         sdb_connection_send(conn, CONNECTION_DATA,
 401                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 402         sdb_strbuf_destroy(buf);
 403         free(f);
 404         return 0;
 405 } /* sdb_fe_exec_list */
 406
 407 int
 408 sdb_fe_exec_lookup(sdb_conn_t *conn, int type,
 409                 sdb_store_matcher_t *m, sdb_store_matcher_t *filter)
 410 {
 411         uint32_t res_type = htonl(CONNECTION_LOOKUP);
 412
 413         sdb_store_json_formatter_t *f;
 414         sdb_strbuf_t *buf;
 415
 416         /* XXX: support other types */
 417         if (type != SDB_HOST) {
 418                 sdb_log(SDB_LOG_ERR, "frontend: Invalid object type %d "
 419                                 "in LOOKUP command", type);
 420                 sdb_strbuf_sprintf(conn->errbuf,
 421                                 "LOOKUP: Invalid object type %d", type);
 422                 return -1;
 423         }
 424
 425         buf = sdb_strbuf_create(1024);
 426         if (! buf) {
 427                 char errbuf[1024];
 428                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 429                                 "buffer to handle LOOKUP command: %s",
 430                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 431
 432                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 433                 return -1;
 434         }
 435         f = sdb_store_json_formatter(buf, type, SDB_WANT_ARRAY);
 436         if (! f) {
 437                 char errbuf[1024];
 438                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 439                                 "JSON formatter to handle LOOKUP command: %s",
 440                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 441
 442                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 443                 sdb_strbuf_destroy(buf);
 444                 return -1;
 445         }
 446
 447         sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
 448
 449         if (sdb_store_scan(SDB_HOST, m, filter, lookup_tojson, f)) {
 450                 sdb_log(SDB_LOG_ERR, "frontend: Failed to lookup hosts");
 451                 sdb_strbuf_sprintf(conn->errbuf, "Failed to lookup hosts");
 452                 sdb_strbuf_destroy(buf);
 453                 free(f);
 454                 return -1;
 455         }
 456         sdb_store_json_finish(f);
 457
 458         sdb_connection_send(conn, CONNECTION_DATA,
 459                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 460         sdb_strbuf_destroy(buf);
 461         free(f);
 462         return 0;
 463 } /* sdb_fe_exec_lookup */
 464
 465 int
 466 sdb_fe_exec_timeseries(sdb_conn_t *conn,
 467                 const char *hostname, const char *metric,
 468                 sdb_timeseries_opts_t *opts)
 469 {
 470         sdb_strbuf_t *buf;
 471         uint32_t res_type = htonl(CONNECTION_TIMESERIES);
 472
 473         buf = sdb_strbuf_create(1024);
 474         if (! buf) {
 475                 char errbuf[1024];
 476                 sdb_log(SDB_LOG_ERR, "frontend: Failed to create "
 477                                 "buffer to handle TIMESERIES command: %s",
 478                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 479
 480                 sdb_strbuf_sprintf(conn->errbuf, "Out of memory");
 481                 return -1;
 482         }
 483
 484         sdb_strbuf_memcpy(buf, &res_type, sizeof(uint32_t));
 485         if (sdb_store_fetch_timeseries(hostname, metric, opts, buf)) {
 486                 sdb_log(SDB_LOG_ERR, "frontend: Failed to fetch time-series");
 487                 sdb_strbuf_sprintf(conn->errbuf, "Failed to fetch time-series");
 488                 sdb_strbuf_destroy(buf);
 489                 return -1;
 490         }
 491
 492         sdb_connection_send(conn, CONNECTION_DATA,
 493                         (uint32_t)sdb_strbuf_len(buf), sdb_strbuf_string(buf));
 494         sdb_strbuf_destroy(buf);
 495         return 0;
 496 } /* sdb_fe_exec_timeseries */
 497
 498 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 499