src/frontend/analyzer.c

   1 /*
   2  * SysDB - src/frontend/analyzer.c
   3  * Copyright (C) 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-private.h"
  31 #include "frontend/connection-private.h"
  32 #include "frontend/parser.h"
  33 #include "utils/error.h"
  34 #include "utils/strbuf.h"
  35
  36 #include <assert.h>
  37
  38 /*
  39  * private helper functions
  40  */
  41
  42 static void
  43 iter_error(sdb_strbuf_t *errbuf, int op, int oper, int context)
  44 {
  45         sdb_strbuf_sprintf(errbuf, "Cannot use %s %s in %s context",
  46                         MATCHER_SYM(op), SDB_STORE_TYPE_TO_NAME(oper),
  47                         SDB_STORE_TYPE_TO_NAME(context));
  48 } /* iter_error */
  49
  50 static void
  51 iter_op_error(sdb_strbuf_t *errbuf, int op,
  52                 int iter_type, int cmp, int value_type)
  53 {
  54         sdb_strbuf_sprintf(errbuf, "Invalid iterator %s %s %s %s",
  55                         MATCHER_SYM(op), SDB_TYPE_TO_STRING(iter_type),
  56                         MATCHER_SYM(cmp), SDB_TYPE_TO_STRING(value_type));
  57         if ((iter_type & 0xff) != value_type)
  58                 sdb_strbuf_append(errbuf, " (type mismatch)");
  59         else
  60                 sdb_strbuf_append(errbuf, " (invalid operator)");
  61 } /* iter_op_error */
  62
  63 static void
  64 cmp_error(sdb_strbuf_t *errbuf, int op, int left, int right)
  65 {
  66         sdb_strbuf_sprintf(errbuf, "Invalid operator %s for types %s and %s",
  67                         MATCHER_SYM(op), SDB_TYPE_TO_STRING(left),
  68                         SDB_TYPE_TO_STRING(right));
  69 } /* cmp_error */
  70
  71 static void
  72 op_error(sdb_strbuf_t *errbuf, int op, int left, int right)
  73 {
  74         sdb_strbuf_sprintf(errbuf, "Invalid operator %s for types %s and %s",
  75                         SDB_DATA_OP_TO_STRING(op), SDB_TYPE_TO_STRING(left),
  76                         SDB_TYPE_TO_STRING(right));
  77 } /* cmp_error */
  78
  79 static int
  80 analyze_expr(int context, sdb_store_expr_t *e, sdb_strbuf_t *errbuf)
  81 {
  82         if (! e)
  83                 return 0;
  84
  85         if ((e->type < TYPED_EXPR) || (SDB_DATA_CONCAT < e->type)) {
  86                 sdb_strbuf_sprintf(errbuf, "Invalid expression of type %d", e->type);
  87                 return -1;
  88         }
  89
  90         switch (e->type) {
  91                 case TYPED_EXPR:
  92                         if (analyze_expr((int)e->data.data.integer, e->left, errbuf))
  93                                 return -1;
  94                         if (context == (int)e->data.data.integer)
  95                                 return 0;
  96                         if ((e->data.data.integer == SDB_HOST) &&
  97                                         ((context == SDB_SERVICE) || (context == SDB_METRIC)))
  98                                 return 0;
  99                         sdb_strbuf_sprintf(errbuf, "Invalid expression %s.%s "
 100                                         "in %s context",
 101                                         SDB_STORE_TYPE_TO_NAME(e->data.data.integer),
 102                                         EXPR_TO_STRING(e->left), SDB_STORE_TYPE_TO_NAME(context));
 103                         return -1;
 104
 105                 case ATTR_VALUE:
 106                 case FIELD_VALUE:
 107                 case 0:
 108                         break;
 109
 110                 default:
 111                         if (analyze_expr(context, e->left, errbuf))
 112                                 return -1;
 113                         if (analyze_expr(context, e->right, errbuf))
 114                                 return -1;
 115
 116                         if ((e->left->data_type > 0) && (e->right->data_type > 0)) {
 117                                 if (sdb_data_expr_type(e->type, e->left->data_type,
 118                                                         e->right->data_type) < 0) {
 119                                         op_error(errbuf, e->type, e->left->data_type,
 120                                                         e->right->data_type);
 121                                         return -1;
 122                                 }
 123                         }
 124                         break;
 125         }
 126         return 0;
 127 } /* analyze_expr */
 128
 129 static int
 130 analyze_matcher(int context, sdb_store_matcher_t *m, sdb_strbuf_t *errbuf)
 131 {
 132         if (! m)
 133                 return 0;
 134
 135         switch (m->type) {
 136                 case MATCHER_OR:
 137                 case MATCHER_AND:
 138                         assert(OP_M(m)->left && OP_M(m)->right);
 139                         if (analyze_matcher(context, OP_M(m)->left, errbuf))
 140                                 return -1;
 141                         if (analyze_matcher(context, OP_M(m)->right, errbuf))
 142                                 return -1;
 143                         break;
 144
 145                 case MATCHER_NOT:
 146                         assert(UOP_M(m)->op);
 147                         if (analyze_matcher(context, UOP_M(m)->op, errbuf))
 148                                 return -1;
 149                         break;
 150
 151                 case MATCHER_ANY:
 152                 case MATCHER_ALL:
 153                         assert(ITER_M(m)->m);
 154                         if ((context != SDB_HOST)
 155                                         && (context != SDB_SERVICE)
 156                                         && (context != SDB_METRIC)) {
 157                                 iter_error(errbuf, m->type, ITER_M(m)->type, context);
 158                                 return -1;
 159                         }
 160                         if (ITER_M(m)->type == context) {
 161                                 iter_error(errbuf, m->type, ITER_M(m)->type, context);
 162                                 return -1;
 163                         }
 164                         if ((ITER_M(m)->type != SDB_SERVICE)
 165                                         && (ITER_M(m)->type != SDB_METRIC)
 166                                         && (ITER_M(m)->type != SDB_ATTRIBUTE)
 167                                         && (ITER_M(m)->type != SDB_FIELD_BACKEND)) {
 168                                 iter_error(errbuf, m->type, ITER_M(m)->type, context);
 169                                 return -1;
 170                         }
 171                         if ((context == SDB_SERVICE)
 172                                         && (ITER_M(m)->type == SDB_METRIC)) {
 173                                 iter_error(errbuf, m->type, ITER_M(m)->type, context);
 174                                 return -1;
 175                         }
 176                         else if ((context == SDB_METRIC)
 177                                         && (ITER_M(m)->type == SDB_SERVICE)) {
 178                                 iter_error(errbuf, m->type, ITER_M(m)->type, context);
 179                                 return -1;
 180                         }
 181                         /* any ary operator will do but these are the once
 182                          * we currently support */
 183                         if ((ITER_M(m)->m->type != MATCHER_LT)
 184                                         && (ITER_M(m)->m->type != MATCHER_LE)
 185                                         && (ITER_M(m)->m->type != MATCHER_EQ)
 186                                         && (ITER_M(m)->m->type != MATCHER_NE)
 187                                         && (ITER_M(m)->m->type != MATCHER_GE)
 188                                         && (ITER_M(m)->m->type != MATCHER_GT)
 189                                         && (ITER_M(m)->m->type != MATCHER_REGEX)
 190                                         && (ITER_M(m)->m->type != MATCHER_NREGEX)) {
 191                                 iter_op_error(errbuf, m->type,
 192                                                 CMP_M(ITER_M(m)->m)->left->data_type,
 193                                                 ITER_M(m)->m->type,
 194                                                 CMP_M(ITER_M(m)->m)->right->data_type);
 195                                 return -1;
 196                         }
 197                         if (ITER_M(m)->type == SDB_FIELD_BACKEND) {
 198                                 if (CMP_M(ITER_M(m)->m)->right->data_type < 0)
 199                                         return 0; /* skip further type checks */
 200                                 if (CMP_M(ITER_M(m)->m)->right->data_type & SDB_TYPE_ARRAY) {
 201                                         iter_op_error(errbuf, m->type,
 202                                                         CMP_M(ITER_M(m)->m)->left->data_type,
 203                                                         ITER_M(m)->m->type,
 204                                                         CMP_M(ITER_M(m)->m)->right->data_type);
 205                                         return -1;
 206                                 }
 207                                 if ((CMP_M(ITER_M(m)->m)->left->data_type & 0xff)
 208                                                 != CMP_M(ITER_M(m)->m)->right->data_type) {
 209                                         iter_op_error(errbuf, m->type,
 210                                                         CMP_M(ITER_M(m)->m)->left->data_type,
 211                                                         ITER_M(m)->m->type,
 212                                                         CMP_M(ITER_M(m)->m)->right->data_type);
 213                                         return -1;
 214                                 }
 215                         }
 216                         else if (analyze_matcher(ITER_M(m)->type, ITER_M(m)->m, errbuf))
 217                                 return -1;
 218                         break;
 219
 220                 case MATCHER_LT:
 221                 case MATCHER_LE:
 222                 case MATCHER_EQ:
 223                 case MATCHER_NE:
 224                 case MATCHER_GE:
 225                 case MATCHER_GT:
 226                         assert(CMP_M(m)->left && CMP_M(m)->right);
 227                         if (analyze_expr(context, CMP_M(m)->left, errbuf))
 228                                 return -1;
 229                         if (analyze_expr(context, CMP_M(m)->right, errbuf))
 230                                 return -1;
 231
 232                         if ((CMP_M(m)->left->data_type > 0)
 233                                         && (CMP_M(m)->right->data_type > 0)) {
 234                                 if (CMP_M(m)->left->data_type == CMP_M(m)->right->data_type)
 235                                         return 0;
 236                                 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
 237                                                 CMP_M(m)->right->data_type);
 238                                 return -1;
 239                         }
 240                         if ((CMP_M(m)->left->data_type > 0)
 241                                         && (CMP_M(m)->left->data_type & SDB_TYPE_ARRAY)) {
 242                                 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
 243                                                 CMP_M(m)->right->data_type);
 244                                 return -1;
 245                         }
 246                         if ((CMP_M(m)->right->data_type > 0)
 247                                         && (CMP_M(m)->right->data_type & SDB_TYPE_ARRAY)) {
 248                                 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
 249                                                 CMP_M(m)->right->data_type);
 250                                 return -1;
 251                         }
 252                         break;
 253
 254                 case MATCHER_IN:
 255                 case MATCHER_NIN:
 256                         if (analyze_expr(context, CMP_M(m)->left, errbuf))
 257                                 return -1;
 258                         if (analyze_expr(context, CMP_M(m)->right, errbuf))
 259                                 return -1;
 260
 261                         /* the left operand may be a scalar or an array but the element
 262                          * type has to match */
 263                         if ((CMP_M(m)->right->data_type > 0)
 264                                         && (! (CMP_M(m)->right->data_type & SDB_TYPE_ARRAY))) {
 265                                 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
 266                                                 CMP_M(m)->right->data_type);
 267                                 return -1;
 268                         }
 269                         if ((CMP_M(m)->left->data_type > 0)
 270                                         && (CMP_M(m)->right->data_type > 0)) {
 271                                 if ((CMP_M(m)->left->data_type & 0xff)
 272                                                 != (CMP_M(m)->right->data_type & 0xff)) {
 273                                         cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
 274                                                         CMP_M(m)->right->data_type);
 275                                         return -1;
 276                                 }
 277                         }
 278                         break;
 279
 280                 case MATCHER_REGEX:
 281                 case MATCHER_NREGEX:
 282                         if (analyze_expr(context, CMP_M(m)->left, errbuf))
 283                                 return -1;
 284                         if (analyze_expr(context, CMP_M(m)->right, errbuf))
 285                                 return -1;
 286
 287                         /* all types are supported for the left operand */
 288                         if ((CMP_M(m)->right->data_type > 0)
 289                                         && (CMP_M(m)->right->data_type != SDB_TYPE_REGEX)
 290                                         && (CMP_M(m)->right->data_type != SDB_TYPE_STRING)) {
 291                                 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
 292                                                 CMP_M(m)->right->data_type);
 293                                 return -1;
 294                         }
 295                         break;
 296
 297                 case MATCHER_ISNULL:
 298                 case MATCHER_ISNNULL:
 299                         if (analyze_expr(context, ISNULL_M(m)->expr, errbuf))
 300                                 return -1;
 301                         break;
 302
 303                 default:
 304                         sdb_strbuf_sprintf(errbuf, "Unknown matcher type %d", m->type);
 305                         return -1;
 306         }
 307         return 0;
 308 } /* analyze_matcher */
 309
 310 /*
 311  * public API
 312  */
 313
 314 int
 315 sdb_fe_analyze(sdb_conn_node_t *node, sdb_strbuf_t *errbuf)
 316 {
 317         sdb_store_matcher_t *m = NULL, *filter = NULL;
 318         int context = -1;
 319         int status = 0;
 320
 321         if (! node)
 322                 return -1;
 323
 324         /* For now, this function checks basic matcher attributes only;
 325          * later, this may be turned into one of multiple AST visitors. */
 326         if (node->cmd == SDB_CONNECTION_FETCH) {
 327                 conn_fetch_t *fetch = CONN_FETCH(node);
 328                 if ((fetch->type == SDB_HOST) && fetch->name) {
 329                         sdb_strbuf_sprintf(errbuf, "Unexpected STRING '%s'", fetch->name);
 330                         return -1;
 331                 }
 332                 if ((fetch->type != SDB_HOST) && (! fetch->name)) {
 333                         sdb_strbuf_sprintf(errbuf, "Missing %s name",
 334                                         SDB_STORE_TYPE_TO_NAME(fetch->type));
 335                         return -1;
 336                 }
 337                 if (fetch->filter)
 338                         filter = fetch->filter->matcher;
 339                 context = fetch->type;
 340         }
 341         else if (node->cmd == SDB_CONNECTION_LIST) {
 342                 if (CONN_LIST(node)->filter)
 343                         filter = CONN_LIST(node)->filter->matcher;
 344                 context = CONN_LIST(node)->type;
 345         }
 346         else if (node->cmd == SDB_CONNECTION_LOOKUP) {
 347                 if (CONN_LOOKUP(node)->matcher)
 348                         m = CONN_LOOKUP(node)->matcher->matcher;
 349                 if (CONN_LOOKUP(node)->filter)
 350                         filter = CONN_LOOKUP(node)->filter->matcher;
 351                 context = CONN_LOOKUP(node)->type;
 352         }
 353         else if ((node->cmd == SDB_CONNECTION_STORE_HOST)
 354                         || (node->cmd == SDB_CONNECTION_STORE_SERVICE)
 355                         || (node->cmd == SDB_CONNECTION_STORE_METRIC)
 356                         || (node->cmd == SDB_CONNECTION_STORE_ATTRIBUTE)) {
 357                 return 0;
 358         }
 359         else if (node->cmd == SDB_CONNECTION_TIMESERIES) {
 360                 return 0;
 361         }
 362         else {
 363                 sdb_strbuf_sprintf(errbuf,
 364                                 "Don't know how to analyze command %#x", node->cmd);
 365                 return -1;
 366         }
 367
 368         if (analyze_matcher(context, m, errbuf))
 369                 status = -1;
 370         if (analyze_matcher(-1, filter, errbuf))
 371                 status = -1;
 372         return status;
 373 } /* sdb_fe_analyze */
 374
 375 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 376