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 */
28 #include "sysdb.h"
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"
36 #include <assert.h>
38 /*
39 * private helper functions
40 */
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 */
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 */
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 */
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 */
79 static int
80 analyze_expr(int context, sdb_store_expr_t *e, sdb_strbuf_t *errbuf)
81 {
82 if (! e)
83 return 0;
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 }
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;
105 case ATTR_VALUE:
106 case FIELD_VALUE:
107 case 0:
108 break;
110 default:
111 if (analyze_expr(context, e->left, errbuf))
112 return -1;
113 if (analyze_expr(context, e->right, errbuf))
114 return -1;
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 */
129 static int
130 analyze_matcher(int context, int parent_type,
131 sdb_store_matcher_t *m, sdb_strbuf_t *errbuf)
132 {
133 if (! m)
134 return 0;
136 switch (m->type) {
137 case MATCHER_OR:
138 case MATCHER_AND:
139 assert(OP_M(m)->left && OP_M(m)->right);
140 if (analyze_matcher(context, m->type, OP_M(m)->left, errbuf))
141 return -1;
142 if (analyze_matcher(context, m->type, OP_M(m)->right, errbuf))
143 return -1;
144 break;
146 case MATCHER_NOT:
147 assert(UOP_M(m)->op);
148 if (analyze_matcher(context, m->type, UOP_M(m)->op, errbuf))
149 return -1;
150 break;
152 case MATCHER_ANY:
153 case MATCHER_ALL:
154 {
155 int type;
156 assert(ITER_M(m)->m);
157 if ((ITER_M(m)->iter->type == TYPED_EXPR)
158 || (ITER_M(m)->iter->type == FIELD_VALUE)) {
159 type = (int)ITER_M(m)->iter->data.data.integer;
160 }
161 else {
162 iter_error(errbuf, m->type, -1, context);
163 return -1;
164 }
165 if ((context != SDB_HOST)
166 && (context != SDB_SERVICE)
167 && (context != SDB_METRIC)) {
168 iter_error(errbuf, m->type, type, context);
169 return -1;
170 }
171 if (type == context) {
172 iter_error(errbuf, m->type, type, context);
173 return -1;
174 }
175 if ((type != SDB_SERVICE)
176 && (type != SDB_METRIC)
177 && (type != SDB_ATTRIBUTE)
178 && (type != SDB_FIELD_BACKEND)) {
179 iter_error(errbuf, m->type, type, context);
180 return -1;
181 }
182 if ((context == SDB_SERVICE) && (type == SDB_METRIC)) {
183 iter_error(errbuf, m->type, type, context);
184 return -1;
185 }
186 else if ((context == SDB_METRIC) && (type == SDB_SERVICE)) {
187 iter_error(errbuf, m->type, type, context);
188 return -1;
189 }
190 /* any ary operator will do but these are the once
191 * we currently support */
192 if ((ITER_M(m)->m->type != MATCHER_LT)
193 && (ITER_M(m)->m->type != MATCHER_LE)
194 && (ITER_M(m)->m->type != MATCHER_EQ)
195 && (ITER_M(m)->m->type != MATCHER_NE)
196 && (ITER_M(m)->m->type != MATCHER_GE)
197 && (ITER_M(m)->m->type != MATCHER_GT)
198 && (ITER_M(m)->m->type != MATCHER_REGEX)
199 && (ITER_M(m)->m->type != MATCHER_NREGEX)) {
200 iter_op_error(errbuf, m->type,
201 CMP_M(ITER_M(m)->m)->left->data_type,
202 ITER_M(m)->m->type,
203 CMP_M(ITER_M(m)->m)->right->data_type);
204 return -1;
205 }
206 if (type == SDB_FIELD_BACKEND) {
207 if (CMP_M(ITER_M(m)->m)->right->data_type < 0)
208 return 0; /* skip further type checks */
209 if (CMP_M(ITER_M(m)->m)->right->data_type & SDB_TYPE_ARRAY) {
210 iter_op_error(errbuf, m->type,
211 CMP_M(ITER_M(m)->m)->left->data_type,
212 ITER_M(m)->m->type,
213 CMP_M(ITER_M(m)->m)->right->data_type);
214 return -1;
215 }
216 if ((CMP_M(ITER_M(m)->m)->left->data_type & 0xff)
217 != CMP_M(ITER_M(m)->m)->right->data_type) {
218 iter_op_error(errbuf, m->type,
219 CMP_M(ITER_M(m)->m)->left->data_type,
220 ITER_M(m)->m->type,
221 CMP_M(ITER_M(m)->m)->right->data_type);
222 return -1;
223 }
224 }
225 else if (analyze_matcher(type, m->type, ITER_M(m)->m, errbuf))
226 return -1;
227 break;
228 }
230 case MATCHER_LT:
231 case MATCHER_LE:
232 case MATCHER_EQ:
233 case MATCHER_NE:
234 case MATCHER_GE:
235 case MATCHER_GT:
236 assert(CMP_M(m)->right);
237 if ((parent_type == MATCHER_ALL)
238 || (parent_type == MATCHER_ANY)) {
239 // TODO: assert(! CMP_M(m)->left);
240 }
241 else {
242 assert(CMP_M(m)->left);
243 }
245 if (analyze_expr(context, CMP_M(m)->left, errbuf))
246 return -1;
247 if (analyze_expr(context, CMP_M(m)->right, errbuf))
248 return -1;
250 if ((CMP_M(m)->left->data_type > 0)
251 && (CMP_M(m)->right->data_type > 0)) {
252 if (CMP_M(m)->left->data_type == CMP_M(m)->right->data_type)
253 return 0;
254 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
255 CMP_M(m)->right->data_type);
256 return -1;
257 }
258 if ((CMP_M(m)->left->data_type > 0)
259 && (CMP_M(m)->left->data_type & SDB_TYPE_ARRAY)) {
260 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
261 CMP_M(m)->right->data_type);
262 return -1;
263 }
264 if ((CMP_M(m)->right->data_type > 0)
265 && (CMP_M(m)->right->data_type & SDB_TYPE_ARRAY)) {
266 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
267 CMP_M(m)->right->data_type);
268 return -1;
269 }
270 break;
272 case MATCHER_IN:
273 case MATCHER_NIN:
274 if (analyze_expr(context, CMP_M(m)->left, errbuf))
275 return -1;
276 if (analyze_expr(context, CMP_M(m)->right, errbuf))
277 return -1;
279 /* the left operand may be a scalar or an array but the element
280 * type has to match */
281 if ((CMP_M(m)->right->data_type > 0)
282 && (! (CMP_M(m)->right->data_type & SDB_TYPE_ARRAY))) {
283 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
284 CMP_M(m)->right->data_type);
285 return -1;
286 }
287 if ((CMP_M(m)->left->data_type > 0)
288 && (CMP_M(m)->right->data_type > 0)) {
289 if ((CMP_M(m)->left->data_type & 0xff)
290 != (CMP_M(m)->right->data_type & 0xff)) {
291 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
292 CMP_M(m)->right->data_type);
293 return -1;
294 }
295 }
296 break;
298 case MATCHER_REGEX:
299 case MATCHER_NREGEX:
300 if (analyze_expr(context, CMP_M(m)->left, errbuf))
301 return -1;
302 if (analyze_expr(context, CMP_M(m)->right, errbuf))
303 return -1;
305 /* all types are supported for the left operand */
306 if ((CMP_M(m)->right->data_type > 0)
307 && (CMP_M(m)->right->data_type != SDB_TYPE_REGEX)
308 && (CMP_M(m)->right->data_type != SDB_TYPE_STRING)) {
309 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
310 CMP_M(m)->right->data_type);
311 return -1;
312 }
313 break;
315 case MATCHER_ISNULL:
316 case MATCHER_ISNNULL:
317 if (analyze_expr(context, ISNULL_M(m)->expr, errbuf))
318 return -1;
319 break;
321 default:
322 sdb_strbuf_sprintf(errbuf, "Unknown matcher type %d", m->type);
323 return -1;
324 }
325 return 0;
326 } /* analyze_matcher */
328 /*
329 * public API
330 */
332 int
333 sdb_fe_analyze(sdb_conn_node_t *node, sdb_strbuf_t *errbuf)
334 {
335 sdb_store_matcher_t *m = NULL, *filter = NULL;
336 int context = -1;
337 int status = 0;
339 if (! node)
340 return -1;
342 /* For now, this function checks basic matcher attributes only;
343 * later, this may be turned into one of multiple AST visitors. */
344 if (node->cmd == SDB_CONNECTION_FETCH) {
345 conn_fetch_t *fetch = CONN_FETCH(node);
346 if ((fetch->type == SDB_HOST) && fetch->name) {
347 sdb_strbuf_sprintf(errbuf, "Unexpected STRING '%s'", fetch->name);
348 return -1;
349 }
350 if ((fetch->type != SDB_HOST) && (! fetch->name)) {
351 sdb_strbuf_sprintf(errbuf, "Missing %s name",
352 SDB_STORE_TYPE_TO_NAME(fetch->type));
353 return -1;
354 }
355 if (fetch->filter)
356 filter = fetch->filter->matcher;
357 context = fetch->type;
358 }
359 else if (node->cmd == SDB_CONNECTION_LIST) {
360 if (CONN_LIST(node)->filter)
361 filter = CONN_LIST(node)->filter->matcher;
362 context = CONN_LIST(node)->type;
363 }
364 else if (node->cmd == SDB_CONNECTION_LOOKUP) {
365 if (CONN_LOOKUP(node)->matcher)
366 m = CONN_LOOKUP(node)->matcher->matcher;
367 if (CONN_LOOKUP(node)->filter)
368 filter = CONN_LOOKUP(node)->filter->matcher;
369 context = CONN_LOOKUP(node)->type;
370 }
371 else if ((node->cmd == SDB_CONNECTION_STORE_HOST)
372 || (node->cmd == SDB_CONNECTION_STORE_SERVICE)
373 || (node->cmd == SDB_CONNECTION_STORE_METRIC)
374 || (node->cmd == SDB_CONNECTION_STORE_ATTRIBUTE)) {
375 return 0;
376 }
377 else if (node->cmd == SDB_CONNECTION_TIMESERIES) {
378 return 0;
379 }
380 else {
381 sdb_strbuf_sprintf(errbuf,
382 "Don't know how to analyze command %#x", node->cmd);
383 return -1;
384 }
386 if (analyze_matcher(context, -1, m, errbuf))
387 status = -1;
388 if (analyze_matcher(-1, -1, filter, errbuf))
389 status = -1;
390 return status;
391 } /* sdb_fe_analyze */
393 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */