src/parser/analyzer.c

   1 /*
   2  * SysDB - src/parser/analyzer.c
   3  * Copyright (C) 2014-2015 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 "parser/ast.h"
  31 #include "parser/parser.h"
  32 #include "utils/error.h"
  33 #include "utils/strbuf.h"
  34
  35 #include <assert.h>
  36 #include <stdarg.h>
  37
  38 #define VALID_OBJ_TYPE(t) ((SDB_HOST <= (t)) && ((t) <= SDB_METRIC))
  39
  40 #define FILTER_CONTEXT -1
  41 #define UNSPEC_CONTEXT -2
  42
  43 static int
  44 analyze_node(int context, sdb_ast_node_t *node, sdb_strbuf_t *errbuf);
  45
  46 /*
  47  * error reporting
  48  */
  49
  50 static void
  51 op_error(sdb_strbuf_t *errbuf, sdb_ast_op_t *op, const char *reason)
  52 {
  53         sdb_strbuf_sprintf(errbuf, "Invalid operation %s %s %s (%s)",
  54                         SDB_TYPE_TO_STRING(op->left->data_type),
  55                         SDB_AST_OP_TO_STRING(op->kind),
  56                         SDB_TYPE_TO_STRING(op->right->data_type),
  57                         reason);
  58 } /* op_error */
  59
  60 static void
  61 __attribute__((format(printf, 3, 4)))
  62 iter_error(sdb_strbuf_t *errbuf, sdb_ast_iter_t *iter, const char *reason, ...)
  63 {
  64         char r[1024];
  65         va_list ap;
  66
  67         va_start(ap, reason);
  68         vsnprintf(r, sizeof(r), reason, ap);
  69         va_end(ap);
  70
  71         assert((iter->expr->type == SDB_AST_TYPE_OPERATOR)
  72                         && (! SDB_AST_OP(iter->expr)->left));
  73         sdb_strbuf_sprintf(errbuf, "Invalid iterator %s %s %s %s (%s)",
  74                         SDB_AST_OP_TO_STRING(iter->kind),
  75                         SDB_TYPE_TO_STRING(iter->iter->data_type),
  76                         SDB_AST_OP_TO_STRING(SDB_AST_OP(iter->expr)->kind),
  77                         SDB_TYPE_TO_STRING(SDB_AST_OP(iter->expr)->right->data_type),
  78                         r);
  79 } /* iter_error */
  80
  81 /*
  82  * expression nodes
  83  */
  84
  85 static int
  86 analyze_logical(int context, sdb_ast_op_t *op, sdb_strbuf_t *errbuf)
  87 {
  88         switch (op->kind) {
  89         case SDB_AST_OR:
  90         case SDB_AST_AND:
  91                 if (! SDB_AST_IS_LOGICAL(op->left)) {
  92                         sdb_strbuf_sprintf(errbuf, "Invalid left operand (%s) "
  93                                         "in %s expression", SDB_AST_TYPE_TO_STRING(op->left),
  94                                         SDB_AST_OP_TO_STRING(op->kind));
  95                         return -1;
  96                 }
  97                 if (analyze_node(context, op->left, errbuf))
  98                         return -1;
  99                 /* fallthrough */
 100         case SDB_AST_NOT:
 101                 if (! SDB_AST_IS_LOGICAL(op->right)) {
 102                         sdb_strbuf_sprintf(errbuf, "Invalid right operand (%s) "
 103                                         "in %s expression", SDB_AST_TYPE_TO_STRING(op->right),
 104                                         SDB_AST_OP_TO_STRING(op->kind));
 105                         return -1;
 106                 }
 107                 if (analyze_node(context, op->right, errbuf))
 108                         return -1;
 109                 break;
 110
 111         case SDB_AST_LT:
 112         case SDB_AST_LE:
 113         case SDB_AST_EQ:
 114         case SDB_AST_NE:
 115         case SDB_AST_GE:
 116         case SDB_AST_GT:
 117         {
 118                 if (analyze_node(context, op->left, errbuf))
 119                         return -1;
 120                 if (analyze_node(context, op->right, errbuf))
 121                         return -1;
 122
 123                 if ((op->left->data_type > 0) && (op->right->data_type > 0)) {
 124                         if (op->left->data_type == op->right->data_type)
 125                                 return 0;
 126                         op_error(errbuf, op, "type mismatch");
 127                         return -1;
 128                 }
 129                 if ((op->left->data_type > 0) && (op->left->data_type & SDB_TYPE_ARRAY)) {
 130                         op_error(errbuf, op, "array not allowed");
 131                         return -1;
 132                 }
 133                 if ((op->right->data_type > 0) && (op->right->data_type & SDB_TYPE_ARRAY)) {
 134                         op_error(errbuf, op, "array not allowed");
 135                         return -1;
 136                 }
 137                 break;
 138         }
 139
 140         case SDB_AST_REGEX:
 141         case SDB_AST_NREGEX:
 142                 if (analyze_node(context, op->left, errbuf))
 143                         return -1;
 144                 if (analyze_node(context, op->right, errbuf))
 145                         return -1;
 146
 147                 /* all types are supported for the left operand
 148                  * TODO: introduce a cast operator if it's not a string */
 149                 if ((op->right->data_type > 0)
 150                                 && (op->right->data_type != SDB_TYPE_REGEX)
 151                                 && (op->right->data_type != SDB_TYPE_STRING)) {
 152                         op_error(errbuf, op, "invalid regex");
 153                         return -1;
 154                 }
 155                 break;
 156
 157         case SDB_AST_ISNULL:
 158         case SDB_AST_ISTRUE:
 159         case SDB_AST_ISFALSE:
 160                 if (analyze_node(context, op->right, errbuf))
 161                         return -1;
 162                 break;
 163
 164         case SDB_AST_IN:
 165                 if (analyze_node(context, op->left, errbuf))
 166                         return -1;
 167                 if (analyze_node(context, op->right, errbuf))
 168                         return -1;
 169
 170                 if ((op->right->data_type > 0) && (! (op->right->data_type & SDB_TYPE_ARRAY))) {
 171                         op_error(errbuf, op, "array expected");
 172                         return -1;
 173                 }
 174                 /* the left operand may be a scalar or an array but the element
 175                  * type has to match */
 176                 if ((op->left->data_type > 0) && (op->right->data_type > 0)
 177                                 && ((op->left->data_type & 0xff) != (op->right->data_type & 0xff))) {
 178                         op_error(errbuf, op, "type mismatch");
 179                         return -1;
 180                 }
 181                 break;
 182
 183         default:
 184                 sdb_strbuf_sprintf(errbuf, "Unknown operand type %d", op->kind);
 185                 return -1;
 186         }
 187         return 0;
 188 } /* analyze_logical */
 189
 190 static int
 191 analyze_arith(int context, sdb_ast_op_t *op, sdb_strbuf_t *errbuf)
 192 {
 193         if (analyze_node(context, op->left, errbuf))
 194                 return -1;
 195         if (analyze_node(context, op->right, errbuf))
 196                 return -1;
 197         SDB_AST_NODE(op)->data_type = sdb_data_expr_type(SDB_AST_OP_TO_DATA_OP(op->kind),
 198                         op->left->data_type, op->right->data_type);
 199
 200         if ((op->left->data_type > 0) && (op->right->data_type > 0)
 201                         && (SDB_AST_NODE(op)->data_type <= 0)) {
 202                 op_error(errbuf, op, "type mismatch");
 203                 return -1;
 204         }
 205
 206         /* TODO: replace constant arithmetic operations with a constant value */
 207         return 0;
 208 } /* analyze_arith */
 209
 210 static int
 211 analyze_iter(int context, sdb_ast_iter_t *iter, sdb_strbuf_t *errbuf)
 212 {
 213         sdb_ast_const_t c = SDB_AST_CONST_INIT;
 214         int iter_context = context;
 215         int status;
 216
 217         if (iter->iter->type == SDB_AST_TYPE_TYPED)
 218                 iter_context = SDB_AST_TYPED(iter->iter)->type;
 219
 220         if (analyze_node(iter_context, iter->iter, errbuf))
 221                 return -1;
 222         /* TODO: support other setups as well */
 223         assert((iter->expr->type == SDB_AST_TYPE_OPERATOR)
 224                         && (! SDB_AST_OP(iter->expr)->left));
 225         /* determine the data-type for better error messages */
 226         analyze_node(iter_context, SDB_AST_OP(iter->expr)->right, NULL);
 227
 228         if (iter->iter->type == SDB_AST_TYPE_TYPED) {
 229                 int iter_type = SDB_AST_TYPED(iter->iter)->type;
 230
 231                 c.value.type = iter->iter->data_type;
 232
 233                 if (iter_type == SDB_ATTRIBUTE) {
 234                         /* attributes are always iterable */
 235                 }
 236                 else if ((context != SDB_HOST) && (context != SDB_SERVICE)
 237                                 && (context != SDB_METRIC) && (context != UNSPEC_CONTEXT)) {
 238                         iter_error(errbuf, iter, "%s not iterable in %s context",
 239                                         SDB_STORE_TYPE_TO_NAME(iter_type),
 240                                         SDB_STORE_TYPE_TO_NAME(context));
 241                         return -1;
 242                 }
 243
 244                 if ((context == iter_type)
 245                                 || ((iter_type != SDB_SERVICE)
 246                                         && (iter_type != SDB_METRIC)
 247                                         && (iter_type != SDB_ATTRIBUTE))
 248                                 || ((context == SDB_SERVICE)
 249                                         && (iter_type == SDB_METRIC))
 250                                 || ((context == SDB_METRIC)
 251                                         && (iter_type == SDB_SERVICE))) {
 252                         iter_error(errbuf, iter, "%s not iterable in %s context",
 253                                         SDB_STORE_TYPE_TO_NAME(iter_type),
 254                                         SDB_STORE_TYPE_TO_NAME(context));
 255                         return -1;
 256                 }
 257         }
 258         else if (iter->iter->type == SDB_AST_TYPE_VALUE) {
 259                 int iter_type = SDB_AST_VALUE(iter->iter)->type;
 260
 261                 c.value.type = iter->iter->data_type & 0xff;
 262
 263                 if (iter_type != SDB_FIELD_BACKEND) {
 264                         iter_error(errbuf, iter, "%s not iterable in %s context",
 265                                         (iter_type == SDB_ATTRIBUTE)
 266                                                 ? "attribute"
 267                                                 : SDB_FIELD_TO_NAME(iter_type),
 268                                         SDB_STORE_TYPE_TO_NAME(context));
 269                         return -1;
 270                 }
 271         }
 272         else if (iter->iter->type == SDB_AST_TYPE_CONST) {
 273                 c.value.type = iter->iter->data_type & 0xff;
 274
 275                 if (! (SDB_AST_CONST(iter->iter)->value.type & SDB_TYPE_ARRAY)) {
 276                         iter_error(errbuf, iter, "%s not iterable",
 277                                         SDB_TYPE_TO_STRING(SDB_AST_CONST(iter->iter)->value.type));
 278                         return -1;
 279                 }
 280         }
 281         else {
 282                 /* TODO: if we know the data-type of iter->iter and it's an array,
 283                  * we should support an iterator for it as well */
 284                 iter_error(errbuf, iter, "%s expression not iterable",
 285                                 SDB_AST_TYPE_TO_STRING(iter->iter));
 286                 return -1;
 287         }
 288
 289         SDB_AST_OP(iter->expr)->left = SDB_AST_NODE(&c);
 290         status = analyze_node(context, iter->expr, errbuf);
 291         SDB_AST_OP(iter->expr)->left = NULL;
 292         if (status)
 293                 return -1;
 294         return 0;
 295 } /* analyze_iter */
 296
 297 static int
 298 analyze_const(int __attribute__((unused)) context, sdb_ast_const_t *c,
 299                 sdb_strbuf_t __attribute__((unused)) *errbuf)
 300 {
 301         SDB_AST_NODE(c)->data_type = c->value.type;
 302         return 0;
 303 } /* analyze_const */
 304
 305 static int
 306 analyze_value(int context, sdb_ast_value_t *v, sdb_strbuf_t *errbuf)
 307 {
 308         if (v->type != SDB_ATTRIBUTE)
 309                 SDB_AST_NODE(v)->data_type = SDB_FIELD_TYPE(v->type);
 310
 311         if ((v->type != SDB_ATTRIBUTE) && v->name) {
 312                 sdb_strbuf_sprintf(errbuf, "Invalid expression %s[%s]",
 313                                 SDB_FIELD_TO_NAME(v->type), v->name);
 314                 return -1;
 315         }
 316         else if ((v->type == SDB_ATTRIBUTE) && (! v->name)) {
 317                 sdb_strbuf_sprintf(errbuf, "Invalid expression attribute[] "
 318                                 "(missing name)");
 319                 return -1;
 320         }
 321
 322         if ((context != SDB_ATTRIBUTE) && (v->type == SDB_FIELD_VALUE)) {
 323                 sdb_strbuf_sprintf(errbuf, "Invalid expression %s.value",
 324                                 SDB_FIELD_TO_NAME(v->type));
 325                 return -1;
 326         }
 327         return 0;
 328 } /* analyze_value */
 329
 330 static int
 331 analyze_typed(int context, sdb_ast_typed_t *t, sdb_strbuf_t *errbuf)
 332 {
 333         if ((t->expr->type != SDB_AST_TYPE_VALUE)
 334                         && (t->expr->type != SDB_AST_TYPE_TYPED)) {
 335                 sdb_strbuf_sprintf(errbuf, "Invalid expression %s.%s",
 336                                 SDB_STORE_TYPE_TO_NAME(t->type),
 337                                 SDB_AST_TYPE_TO_STRING(t->expr));
 338                 return -1;
 339         }
 340         if (analyze_node(t->type, t->expr, errbuf))
 341                 return -1;
 342         SDB_AST_NODE(t)->data_type = t->expr->data_type;
 343
 344         if ((t->type != SDB_ATTRIBUTE) && (! VALID_OBJ_TYPE(t->type))) {
 345                 sdb_strbuf_sprintf(errbuf, "Invalid expression %#x.%s",
 346                                 t->type, SDB_AST_TYPE_TO_STRING(t->expr));
 347                 return -1;
 348         }
 349
 350         /* self-references are allowed and services and metrics may reference
 351          * their parent host; everything may reference attributes */
 352         if ((context != t->type) && (context > 0)
 353                         && (((context != SDB_SERVICE) && (context != SDB_METRIC))
 354                                 || (t->type != SDB_HOST))
 355                         && (t->type != SDB_ATTRIBUTE)) {
 356                 sdb_strbuf_sprintf(errbuf, "Invalid expression %s.%s in %s context",
 357                                 SDB_STORE_TYPE_TO_NAME(t->type),
 358                                 SDB_AST_TYPE_TO_STRING(t->expr),
 359                                 context == -1 ? "generic" : SDB_STORE_TYPE_TO_NAME(context));
 360                 return -1;
 361         }
 362         return 0;
 363 } /* analyze_typed */
 364
 365 static int
 366 analyze_node(int context, sdb_ast_node_t *node, sdb_strbuf_t *errbuf)
 367 {
 368         if (! node) {
 369                 sdb_strbuf_sprintf(errbuf, "Empty AST node");
 370                 return -1;
 371         }
 372
 373         /* unknown by default */
 374         node->data_type = -1;
 375
 376         if ((node->type == SDB_AST_TYPE_OPERATOR)
 377                         && (SDB_AST_IS_LOGICAL(node)))
 378                 return analyze_logical(context, SDB_AST_OP(node), errbuf);
 379         else if ((node->type == SDB_AST_TYPE_OPERATOR)
 380                         && (SDB_AST_IS_ARITHMETIC(node)))
 381                 return analyze_arith(context, SDB_AST_OP(node), errbuf);
 382         else if (node->type == SDB_AST_TYPE_ITERATOR)
 383                 return analyze_iter(context, SDB_AST_ITER(node), errbuf);
 384         else if (node->type == SDB_AST_TYPE_CONST)
 385                 return analyze_const(context, SDB_AST_CONST(node), errbuf);
 386         else if (node->type == SDB_AST_TYPE_VALUE)
 387                 return analyze_value(context, SDB_AST_VALUE(node), errbuf);
 388         else if (node->type == SDB_AST_TYPE_TYPED)
 389                 return analyze_typed(context, SDB_AST_TYPED(node), errbuf);
 390
 391         sdb_strbuf_sprintf(errbuf, "Invalid expression node "
 392                         "of type %#x", node->type);
 393         return -1;
 394 } /* analyze_node */
 395
 396 /*
 397  * top level / command nodes
 398  */
 399
 400 static int
 401 analyze_fetch(sdb_ast_fetch_t *fetch, sdb_strbuf_t *errbuf)
 402 {
 403         if (! VALID_OBJ_TYPE(fetch->obj_type)) {
 404                 sdb_strbuf_sprintf(errbuf, "Invalid object type %#x "
 405                                 "in FETCH command", fetch->obj_type);
 406                 return -1;
 407         }
 408         if (! fetch->name) {
 409                 sdb_strbuf_sprintf(errbuf, "Missing object name in "
 410                                 "FETCH %s command", SDB_STORE_TYPE_TO_NAME(fetch->obj_type));
 411                 return -1;
 412         }
 413
 414         if ((fetch->obj_type == SDB_HOST) && fetch->hostname) {
 415                 sdb_strbuf_sprintf(errbuf, "Unexpected parent hostname '%s' "
 416                                 "in FETCH HOST command", fetch->hostname);
 417                 return -1;
 418         }
 419         else if ((fetch->obj_type != SDB_HOST) && (! fetch->hostname)) {
 420                 sdb_strbuf_sprintf(errbuf, "Missing parent hostname for '%s' "
 421                                 "in FETCH %s command", fetch->name,
 422                                 SDB_STORE_TYPE_TO_NAME(fetch->obj_type));
 423                 return -1;
 424         }
 425
 426         if (fetch->filter)
 427                 return analyze_node(FILTER_CONTEXT, fetch->filter, errbuf);
 428         return 0;
 429 } /* analyze_fetch */
 430
 431 static int
 432 analyze_list(sdb_ast_list_t *list, sdb_strbuf_t *errbuf)
 433 {
 434         if (! VALID_OBJ_TYPE(list->obj_type)) {
 435                 sdb_strbuf_sprintf(errbuf, "Invalid object type %#x "
 436                                 "in LIST command", list->obj_type);
 437                 return -1;
 438         }
 439         if (list->filter)
 440                 return analyze_node(FILTER_CONTEXT, list->filter, errbuf);
 441         return 0;
 442 } /* analyze_list */
 443
 444 static int
 445 analyze_lookup(sdb_ast_lookup_t *lookup, sdb_strbuf_t *errbuf)
 446 {
 447         if (! VALID_OBJ_TYPE(lookup->obj_type)) {
 448                 sdb_strbuf_sprintf(errbuf, "Invalid object type %#x "
 449                                 "in LOOKUP command", lookup->obj_type);
 450                 return -1;
 451         }
 452         if (lookup->matcher)
 453                 if (analyze_node(lookup->obj_type, lookup->matcher, errbuf))
 454                         return -1;
 455         if (lookup->filter)
 456                 return analyze_node(FILTER_CONTEXT, lookup->filter, errbuf);
 457         return 0;
 458 } /* analyze_lookup */
 459
 460 static int
 461 analyze_store(sdb_ast_store_t *st, sdb_strbuf_t *errbuf)
 462 {
 463         if ((st->obj_type != SDB_ATTRIBUTE)
 464                         && (! VALID_OBJ_TYPE(st->obj_type))) {
 465                 sdb_strbuf_sprintf(errbuf, "Invalid object type %#x "
 466                                 "in STORE command", st->obj_type);
 467                 return -1;
 468         }
 469         if (! st->name) {
 470                 sdb_strbuf_sprintf(errbuf, "Missing object name in "
 471                                 "STORE %s command", SDB_STORE_TYPE_TO_NAME(st->obj_type));
 472                 return -1;
 473         }
 474
 475         if ((st->obj_type == SDB_HOST) && st->hostname) {
 476                 sdb_strbuf_sprintf(errbuf, "Unexpected parent hostname '%s' "
 477                                 "in STORE HOST command", st->hostname);
 478                 return -1;
 479         }
 480         else if ((st->obj_type != SDB_HOST) && (! st->hostname)) {
 481                 sdb_strbuf_sprintf(errbuf, "Missing parent hostname for '%s' "
 482                                 "in STORE %s command", st->name,
 483                                 SDB_STORE_TYPE_TO_NAME(st->obj_type));
 484                 return -1;
 485         }
 486
 487         if (st->obj_type == SDB_ATTRIBUTE) {
 488                 if ((st->parent_type <= 0) && st->parent) {
 489                         sdb_strbuf_sprintf(errbuf, "Unexpected parent hostname '%s' "
 490                                         "in STORE %s command", st->parent,
 491                                         SDB_STORE_TYPE_TO_NAME(st->obj_type));
 492                         return -1;
 493                 }
 494                 else if (st->parent_type > 0) {
 495                         if (! VALID_OBJ_TYPE(st->parent_type)) {
 496                                 sdb_strbuf_sprintf(errbuf, "Invalid parent type %#x "
 497                                                 "in STORE %s command", st->parent_type,
 498                                                 SDB_STORE_TYPE_TO_NAME(st->obj_type));
 499                                 return -1;
 500                         }
 501                         if (! st->parent) {
 502                                 sdb_strbuf_sprintf(errbuf, "Missing %s parent name "
 503                                                 "in STORE %s command",
 504                                                 SDB_STORE_TYPE_TO_NAME(st->parent_type),
 505                                                 SDB_STORE_TYPE_TO_NAME(st->obj_type));
 506                                 return -1;
 507                         }
 508                 }
 509         }
 510         else if ((st->parent_type > 0) || st->parent) {
 511                 sdb_strbuf_sprintf(errbuf, "Unexpected %s parent name '%s' "
 512                                 "in STORE %s command",
 513                                 SDB_STORE_TYPE_TO_NAME(st->parent_type),
 514                                 st->parent ? st->parent : "<unknown>",
 515                                 SDB_STORE_TYPE_TO_NAME(st->obj_type));
 516                 return -1;
 517         }
 518
 519         if (st->obj_type == SDB_METRIC) {
 520                 if ((! st->store_type) != (! st->store_id)) {
 521                         sdb_strbuf_sprintf(errbuf, "Incomplete metric store %s %s "
 522                                         "in STORE METRIC command",
 523                                         st->store_type ? st->store_type : "<unknown>",
 524                                         st->store_id ? st->store_id : "<unknown>");
 525                         return -1;
 526                 }
 527         }
 528         else if (st->store_type || st->store_id) {
 529                 sdb_strbuf_sprintf(errbuf, "Unexpected metric store %s %s "
 530                                 "in STORE %s command",
 531                                 st->store_type ? st->store_type : "<unknown>",
 532                                 st->store_id ? st->store_id : "<unknown>",
 533                                 SDB_STORE_TYPE_TO_NAME(st->obj_type));
 534                 return -1;
 535         }
 536
 537         if ((! (st->obj_type == SDB_ATTRIBUTE))
 538                         && (st->value.type != SDB_TYPE_NULL)) {
 539                 char v_str[sdb_data_format(&st->value, NULL, 0, SDB_DOUBLE_QUOTED) + 1];
 540                 sdb_data_format(&st->value, v_str, sizeof(v_str), SDB_DOUBLE_QUOTED);
 541                 sdb_strbuf_sprintf(errbuf, "Unexpected value %s in STORE %s command",
 542                                 v_str, SDB_STORE_TYPE_TO_NAME(st->obj_type));
 543                 return -1;
 544         }
 545         return 0;
 546 } /* analyze_store */
 547
 548 static int
 549 analyze_timeseries(sdb_ast_timeseries_t *ts, sdb_strbuf_t *errbuf)
 550 {
 551         if (! ts->hostname) {
 552                 sdb_strbuf_sprintf(errbuf, "Missing hostname in STORE command");
 553                 return -1;
 554         }
 555         if (! ts->metric) {
 556                 sdb_strbuf_sprintf(errbuf, "Missing metric name in STORE command");
 557                 return -1;
 558         }
 559         if (ts->end <= ts->start) {
 560                 char start_str[64], end_str[64];
 561                 sdb_strftime(start_str, sizeof(start_str), "%F %T Tz", ts->start);
 562                 sdb_strftime(end_str, sizeof(end_str), "%F %T Tz", ts->end);
 563                 sdb_strbuf_sprintf(errbuf, "Start time (%s) greater than "
 564                                 "end time (%s) in STORE command", start_str, end_str);
 565                 return -1;
 566         }
 567         return 0;
 568 } /* analyze_timeseries */
 569
 570 /*
 571  * public API
 572  */
 573
 574 int
 575 sdb_parser_analyze(sdb_ast_node_t *node, sdb_strbuf_t *errbuf)
 576 {
 577         if (! node) {
 578                 sdb_strbuf_sprintf(errbuf, "Empty AST node");
 579                 return -1;
 580         }
 581
 582         /* top-level nodes don't have a type */
 583         node->data_type = -1;
 584
 585         if (node->type == SDB_AST_TYPE_FETCH)
 586                 return analyze_fetch(SDB_AST_FETCH(node), errbuf);
 587         else if (node->type == SDB_AST_TYPE_LIST)
 588                 return analyze_list(SDB_AST_LIST(node), errbuf);
 589         else if (node->type == SDB_AST_TYPE_LOOKUP)
 590                 return analyze_lookup(SDB_AST_LOOKUP(node), errbuf);
 591         else if (node->type == SDB_AST_TYPE_STORE)
 592                 return analyze_store(SDB_AST_STORE(node), errbuf);
 593         else if (node->type == SDB_AST_TYPE_TIMESERIES)
 594                 return analyze_timeseries(SDB_AST_TIMESERIES(node), errbuf);
 595
 596         sdb_strbuf_sprintf(errbuf, "Invalid top-level AST node "
 597                         "of type %#x", node->type);
 598         return -1;
 599 } /* sdb_parser_analyze */
 600
 601 int
 602 sdb_parser_analyze_conditional(sdb_ast_node_t *node, sdb_strbuf_t *errbuf)
 603 {
 604         if (! node) {
 605                 sdb_strbuf_sprintf(errbuf, "Empty conditional node");
 606                 return -1;
 607         }
 608         if (! SDB_AST_IS_LOGICAL(node)) {
 609                 sdb_strbuf_sprintf(errbuf, "Not a conditional node (got %s)",
 610                                 SDB_AST_TYPE_TO_STRING(node));
 611                 return -1;
 612         }
 613         return analyze_node(UNSPEC_CONTEXT, node, errbuf);
 614 } /* sdb_parser_analyze_conditional */
 615
 616 int
 617 sdb_parser_analyze_arith(sdb_ast_node_t *node, sdb_strbuf_t *errbuf)
 618 {
 619         if (! node) {
 620                 sdb_strbuf_sprintf(errbuf, "Empty arithmetic node");
 621                 return -1;
 622         }
 623         if (! SDB_AST_IS_ARITHMETIC(node)) {
 624                 sdb_strbuf_sprintf(errbuf, "Not an arithmetic node (got %s)",
 625                                 SDB_AST_TYPE_TO_STRING(node));
 626                 return -1;
 627         }
 628         return analyze_node(UNSPEC_CONTEXT, node, errbuf);
 629 } /* sdb_parser_analyze_arith */
 630
 631 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 632