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_array_error(sdb_strbuf_t *errbuf, int op,
  52                 int array_type, int cmp, int value_type)
  53 {
  54         sdb_strbuf_sprintf(errbuf, "Invalid array iterator %s %s %s %s",
  55                         MATCHER_SYM(op), SDB_TYPE_TO_STRING(array_type),
  56                         MATCHER_SYM(cmp), SDB_TYPE_TO_STRING(value_type));
  57         if ((array_type & 0xff) != value_type)
  58                 sdb_strbuf_append(errbuf, " (type mismatch)");
  59         else
  60                 sdb_strbuf_append(errbuf, " (invalid operator)");
  61 } /* iter_array_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 int
  72 analyze_expr(int context, sdb_store_expr_t *e, sdb_strbuf_t *errbuf)
  73 {
  74         if (! e)
  75                 return 0;
  76
  77         if ((e->type < TYPED_EXPR) || (SDB_DATA_CONCAT < e->type)) {
  78                 sdb_strbuf_sprintf(errbuf, "Invalid expression of type %d", e->type);
  79                 return -1;
  80         }
  81
  82         switch (e->type) {
  83                 case TYPED_EXPR:
  84                         if (analyze_expr((int)e->data.data.integer, e->left, errbuf))
  85                                 return -1;
  86                         if (context == (int)e->data.data.integer)
  87                                 return 0;
  88                         if ((e->data.data.integer == SDB_HOST) &&
  89                                         ((context == SDB_SERVICE) || (context == SDB_METRIC)))
  90                                 return 0;
  91                         sdb_strbuf_sprintf(errbuf, "Invalid expression %s.%s "
  92                                         "in %s context",
  93                                         SDB_STORE_TYPE_TO_NAME(e->data.data.integer),
  94                                         EXPR_TO_STRING(e->left), SDB_STORE_TYPE_TO_NAME(context));
  95                         return -1;
  96
  97                 case ATTR_VALUE:
  98                 case FIELD_VALUE:
  99                 case 0:
 100                         break;
 101
 102                 default:
 103                         if (analyze_expr(context, e->left, errbuf))
 104                                 return -1;
 105                         if (analyze_expr(context, e->right, errbuf))
 106                                 return -1;
 107                         break;
 108         }
 109         return 0;
 110 } /* analyze_expr */
 111
 112 static int
 113 analyze_matcher(int context, sdb_store_matcher_t *m, sdb_strbuf_t *errbuf)
 114 {
 115         if (! m)
 116                 return 0;
 117
 118         switch (m->type) {
 119                 case MATCHER_OR:
 120                 case MATCHER_AND:
 121                         assert(OP_M(m)->left && OP_M(m)->right);
 122                         if (analyze_matcher(context, OP_M(m)->left, errbuf))
 123                                 return -1;
 124                         if (analyze_matcher(context, OP_M(m)->right, errbuf))
 125                                 return -1;
 126                         break;
 127
 128                 case MATCHER_NOT:
 129                         assert(UOP_M(m)->op);
 130                         if (analyze_matcher(context, UOP_M(m)->op, errbuf))
 131                                 return -1;
 132                         break;
 133
 134                 case MATCHER_ANY:
 135                 case MATCHER_ALL:
 136                         assert(ITER_M(m)->m);
 137                         if ((context != SDB_HOST)
 138                                         && (context != SDB_SERVICE)
 139                                         && (context != SDB_METRIC)) {
 140                                 iter_error(errbuf, m->type, ITER_M(m)->type, context);
 141                                 return -1;
 142                         }
 143                         if (ITER_M(m)->type == context) {
 144                                 iter_error(errbuf, m->type, ITER_M(m)->type, context);
 145                                 return -1;
 146                         }
 147                         if ((ITER_M(m)->type != SDB_SERVICE)
 148                                         && (ITER_M(m)->type != SDB_METRIC)
 149                                         && (ITER_M(m)->type != SDB_ATTRIBUTE)
 150                                         && (ITER_M(m)->type != SDB_FIELD_BACKEND)) {
 151                                 iter_error(errbuf, m->type, ITER_M(m)->type, context);
 152                                 return -1;
 153                         }
 154                         if ((context == SDB_SERVICE)
 155                                         && (ITER_M(m)->type == SDB_METRIC)) {
 156                                 iter_error(errbuf, m->type, ITER_M(m)->type, context);
 157                                 return -1;
 158                         }
 159                         else if ((context == SDB_METRIC)
 160                                         && (ITER_M(m)->type == SDB_SERVICE)) {
 161                                 iter_error(errbuf, m->type, ITER_M(m)->type, context);
 162                                 return -1;
 163                         }
 164                         if (ITER_M(m)->type == SDB_FIELD_BACKEND) {
 165                                 /* array iterators only support simple comparison atm */
 166                                 if ((ITER_M(m)->m->type != MATCHER_LT)
 167                                                 && (ITER_M(m)->m->type != MATCHER_LE)
 168                                                 && (ITER_M(m)->m->type != MATCHER_EQ)
 169                                                 && (ITER_M(m)->m->type != MATCHER_NE)
 170                                                 && (ITER_M(m)->m->type != MATCHER_GE)
 171                                                 && (ITER_M(m)->m->type != MATCHER_GT)
 172                                                 && (ITER_M(m)->m->type != MATCHER_REGEX)
 173                                                 && (ITER_M(m)->m->type != MATCHER_NREGEX)) {
 174                                         iter_array_error(errbuf, m->type,
 175                                                         CMP_M(ITER_M(m)->m)->left->data_type,
 176                                                         ITER_M(m)->m->type,
 177                                                         CMP_M(ITER_M(m)->m)->right->data_type);
 178                                         return -1;
 179                                 }
 180                                 if (CMP_M(ITER_M(m)->m)->right->data_type < 0)
 181                                         return 0; /* skip further type checks */
 182                                 if (CMP_M(ITER_M(m)->m)->right->data_type & SDB_TYPE_ARRAY) {
 183                                         iter_array_error(errbuf, m->type,
 184                                                         CMP_M(ITER_M(m)->m)->left->data_type,
 185                                                         ITER_M(m)->m->type,
 186                                                         CMP_M(ITER_M(m)->m)->right->data_type);
 187                                         return -1;
 188                                 }
 189                                 if ((CMP_M(ITER_M(m)->m)->left->data_type & 0xff)
 190                                                 != CMP_M(ITER_M(m)->m)->right->data_type) {
 191                                         iter_array_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                         }
 198                         else if (analyze_matcher(ITER_M(m)->type, ITER_M(m)->m, errbuf))
 199                                 return -1;
 200                         break;
 201
 202                 case MATCHER_LT:
 203                 case MATCHER_LE:
 204                 case MATCHER_EQ:
 205                 case MATCHER_NE:
 206                 case MATCHER_GE:
 207                 case MATCHER_GT:
 208                         assert(CMP_M(m)->left && CMP_M(m)->right);
 209                         if (analyze_expr(context, CMP_M(m)->left, errbuf))
 210                                 return -1;
 211                         if (analyze_expr(context, CMP_M(m)->right, errbuf))
 212                                 return -1;
 213
 214                         if ((CMP_M(m)->left->data_type > 0)
 215                                         && (CMP_M(m)->right->data_type > 0)
 216                                         && (CMP_M(m)->left->data_type == CMP_M(m)->right->data_type))
 217                                 return 0;
 218                         if ((CMP_M(m)->left->data_type > 0)
 219                                         && (CMP_M(m)->left->data_type & SDB_TYPE_ARRAY)) {
 220                                 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
 221                                                 CMP_M(m)->right->data_type);
 222                                 return -1;
 223                         }
 224                         if ((CMP_M(m)->right->data_type > 0)
 225                                         && (CMP_M(m)->right->data_type & SDB_TYPE_ARRAY)) {
 226                                 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
 227                                                 CMP_M(m)->right->data_type);
 228                                 return -1;
 229                         }
 230                         break;
 231
 232                 case MATCHER_IN:
 233                         if (analyze_expr(context, CMP_M(m)->left, errbuf))
 234                                 return -1;
 235                         if (analyze_expr(context, CMP_M(m)->right, errbuf))
 236                                 return -1;
 237
 238                         if ((CMP_M(m)->left->data_type > 0)
 239                                         && (CMP_M(m)->left->data_type & SDB_TYPE_ARRAY)) {
 240                                 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
 241                                                 CMP_M(m)->right->data_type);
 242                                 return -1;
 243                         }
 244                         if ((CMP_M(m)->right->data_type > 0)
 245                                         && (! (CMP_M(m)->right->data_type & SDB_TYPE_ARRAY))) {
 246                                 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
 247                                                 CMP_M(m)->right->data_type);
 248                                 return -1;
 249                         }
 250                         break;
 251
 252                 case MATCHER_REGEX:
 253                 case MATCHER_NREGEX:
 254                         if (analyze_expr(context, CMP_M(m)->left, errbuf))
 255                                 return -1;
 256                         if (analyze_expr(context, CMP_M(m)->right, errbuf))
 257                                 return -1;
 258
 259                         /* all types are supported for the left operand */
 260                         if ((CMP_M(m)->right->data_type > 0)
 261                                         && (CMP_M(m)->right->data_type != SDB_TYPE_REGEX)
 262                                         && (CMP_M(m)->right->data_type != SDB_TYPE_STRING)) {
 263                                 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
 264                                                 CMP_M(m)->right->data_type);
 265                                 return -1;
 266                         }
 267                         break;
 268
 269                 case MATCHER_ISNULL:
 270                 case MATCHER_ISNNULL:
 271                         if (analyze_expr(context, ISNULL_M(m)->expr, errbuf))
 272                                 return -1;
 273                         break;
 274
 275                 default:
 276                         sdb_strbuf_sprintf(errbuf, "Unknown matcher type %d", m->type);
 277                         return -1;
 278         }
 279         return 0;
 280 } /* analyze_matcher */
 281
 282 /*
 283  * public API
 284  */
 285
 286 int
 287 sdb_fe_analyze(sdb_conn_node_t *node, sdb_strbuf_t *errbuf)
 288 {
 289         sdb_store_matcher_t *m = NULL, *filter = NULL;
 290         int context = -1;
 291         int status = 0;
 292
 293         if (! node)
 294                 return -1;
 295
 296         /* For now, this function checks basic matcher attributes only;
 297          * later, this may be turned into one of multiple AST visitors. */
 298         if (node->cmd == SDB_CONNECTION_FETCH) {
 299                 conn_fetch_t *fetch = CONN_FETCH(node);
 300                 if ((fetch->type == SDB_HOST) && fetch->name) {
 301                         sdb_strbuf_sprintf(errbuf, "Unexpected STRING '%s'", fetch->name);
 302                         return -1;
 303                 }
 304                 if ((fetch->type != SDB_HOST) && (! fetch->name)) {
 305                         sdb_strbuf_sprintf(errbuf, "Missing %s name",
 306                                         SDB_STORE_TYPE_TO_NAME(fetch->type));
 307                         return -1;
 308                 }
 309                 if (fetch->filter)
 310                         filter = fetch->filter->matcher;
 311                 context = fetch->type;
 312         }
 313         else if (node->cmd == SDB_CONNECTION_LIST) {
 314                 if (CONN_LIST(node)->filter)
 315                         filter = CONN_LIST(node)->filter->matcher;
 316                 context = CONN_LIST(node)->type;
 317         }
 318         else if (node->cmd == SDB_CONNECTION_LOOKUP) {
 319                 if (CONN_LOOKUP(node)->matcher)
 320                         m = CONN_LOOKUP(node)->matcher->matcher;
 321                 if (CONN_LOOKUP(node)->filter)
 322                         filter = CONN_LOOKUP(node)->filter->matcher;
 323                 context = CONN_LOOKUP(node)->type;
 324         }
 325         else if ((node->cmd == SDB_CONNECTION_STORE_HOST)
 326                         || (node->cmd == SDB_CONNECTION_STORE_SERVICE)
 327                         || (node->cmd == SDB_CONNECTION_STORE_METRIC)
 328                         || (node->cmd == SDB_CONNECTION_STORE_ATTRIBUTE)) {
 329                 return 0;
 330         }
 331         else if (node->cmd == SDB_CONNECTION_TIMESERIES) {
 332                 return 0;
 333         }
 334         else {
 335                 sdb_strbuf_sprintf(errbuf,
 336                                 "Don't know how to analyze command %#x", node->cmd);
 337                 return -1;
 338         }
 339
 340         if (analyze_matcher(context, m, errbuf))
 341                 status = -1;
 342         if (analyze_matcher(-1, filter, errbuf))
 343                 status = -1;
 344         return status;
 345 } /* sdb_fe_analyze */
 346
 347 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 348