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 assert(ITER_M(m)->m);
155 if ((context != SDB_HOST)
156 && (context != SDB_SERVICE)
157 && (context != SDB_METRIC)) {
158 iter_error(errbuf, m->type, ITER_M(m)->type, context);
159 return -1;
160 }
161 if (ITER_M(m)->type == context) {
162 iter_error(errbuf, m->type, ITER_M(m)->type, context);
163 return -1;
164 }
165 if ((ITER_M(m)->type != SDB_SERVICE)
166 && (ITER_M(m)->type != SDB_METRIC)
167 && (ITER_M(m)->type != SDB_ATTRIBUTE)
168 && (ITER_M(m)->type != SDB_FIELD_BACKEND)) {
169 iter_error(errbuf, m->type, ITER_M(m)->type, context);
170 return -1;
171 }
172 if ((context == SDB_SERVICE)
173 && (ITER_M(m)->type == SDB_METRIC)) {
174 iter_error(errbuf, m->type, ITER_M(m)->type, context);
175 return -1;
176 }
177 else if ((context == SDB_METRIC)
178 && (ITER_M(m)->type == SDB_SERVICE)) {
179 iter_error(errbuf, m->type, ITER_M(m)->type, context);
180 return -1;
181 }
182 /* any ary operator will do but these are the once
183 * we currently support */
184 if ((ITER_M(m)->m->type != MATCHER_LT)
185 && (ITER_M(m)->m->type != MATCHER_LE)
186 && (ITER_M(m)->m->type != MATCHER_EQ)
187 && (ITER_M(m)->m->type != MATCHER_NE)
188 && (ITER_M(m)->m->type != MATCHER_GE)
189 && (ITER_M(m)->m->type != MATCHER_GT)
190 && (ITER_M(m)->m->type != MATCHER_REGEX)
191 && (ITER_M(m)->m->type != MATCHER_NREGEX)) {
192 iter_op_error(errbuf, m->type,
193 CMP_M(ITER_M(m)->m)->left->data_type,
194 ITER_M(m)->m->type,
195 CMP_M(ITER_M(m)->m)->right->data_type);
196 return -1;
197 }
198 if (ITER_M(m)->type == SDB_FIELD_BACKEND) {
199 if (CMP_M(ITER_M(m)->m)->right->data_type < 0)
200 return 0; /* skip further type checks */
201 if (CMP_M(ITER_M(m)->m)->right->data_type & SDB_TYPE_ARRAY) {
202 iter_op_error(errbuf, m->type,
203 CMP_M(ITER_M(m)->m)->left->data_type,
204 ITER_M(m)->m->type,
205 CMP_M(ITER_M(m)->m)->right->data_type);
206 return -1;
207 }
208 if ((CMP_M(ITER_M(m)->m)->left->data_type & 0xff)
209 != CMP_M(ITER_M(m)->m)->right->data_type) {
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 }
217 else if (analyze_matcher(ITER_M(m)->type, m->type,
218 ITER_M(m)->m, errbuf))
219 return -1;
220 break;
222 case MATCHER_LT:
223 case MATCHER_LE:
224 case MATCHER_EQ:
225 case MATCHER_NE:
226 case MATCHER_GE:
227 case MATCHER_GT:
228 assert(CMP_M(m)->right);
229 if ((parent_type == MATCHER_ALL)
230 || (parent_type == MATCHER_ANY)) {
231 // TODO: assert(! CMP_M(m)->left);
232 }
233 else {
234 assert(CMP_M(m)->left);
235 }
237 if (analyze_expr(context, CMP_M(m)->left, errbuf))
238 return -1;
239 if (analyze_expr(context, CMP_M(m)->right, errbuf))
240 return -1;
242 if ((CMP_M(m)->left->data_type > 0)
243 && (CMP_M(m)->right->data_type > 0)) {
244 if (CMP_M(m)->left->data_type == CMP_M(m)->right->data_type)
245 return 0;
246 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
247 CMP_M(m)->right->data_type);
248 return -1;
249 }
250 if ((CMP_M(m)->left->data_type > 0)
251 && (CMP_M(m)->left->data_type & SDB_TYPE_ARRAY)) {
252 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
253 CMP_M(m)->right->data_type);
254 return -1;
255 }
256 if ((CMP_M(m)->right->data_type > 0)
257 && (CMP_M(m)->right->data_type & SDB_TYPE_ARRAY)) {
258 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
259 CMP_M(m)->right->data_type);
260 return -1;
261 }
262 break;
264 case MATCHER_IN:
265 case MATCHER_NIN:
266 if (analyze_expr(context, CMP_M(m)->left, errbuf))
267 return -1;
268 if (analyze_expr(context, CMP_M(m)->right, errbuf))
269 return -1;
271 /* the left operand may be a scalar or an array but the element
272 * type has to match */
273 if ((CMP_M(m)->right->data_type > 0)
274 && (! (CMP_M(m)->right->data_type & SDB_TYPE_ARRAY))) {
275 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
276 CMP_M(m)->right->data_type);
277 return -1;
278 }
279 if ((CMP_M(m)->left->data_type > 0)
280 && (CMP_M(m)->right->data_type > 0)) {
281 if ((CMP_M(m)->left->data_type & 0xff)
282 != (CMP_M(m)->right->data_type & 0xff)) {
283 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
284 CMP_M(m)->right->data_type);
285 return -1;
286 }
287 }
288 break;
290 case MATCHER_REGEX:
291 case MATCHER_NREGEX:
292 if (analyze_expr(context, CMP_M(m)->left, errbuf))
293 return -1;
294 if (analyze_expr(context, CMP_M(m)->right, errbuf))
295 return -1;
297 /* all types are supported for the left operand */
298 if ((CMP_M(m)->right->data_type > 0)
299 && (CMP_M(m)->right->data_type != SDB_TYPE_REGEX)
300 && (CMP_M(m)->right->data_type != SDB_TYPE_STRING)) {
301 cmp_error(errbuf, m->type, CMP_M(m)->left->data_type,
302 CMP_M(m)->right->data_type);
303 return -1;
304 }
305 break;
307 case MATCHER_ISNULL:
308 case MATCHER_ISNNULL:
309 if (analyze_expr(context, ISNULL_M(m)->expr, errbuf))
310 return -1;
311 break;
313 default:
314 sdb_strbuf_sprintf(errbuf, "Unknown matcher type %d", m->type);
315 return -1;
316 }
317 return 0;
318 } /* analyze_matcher */
320 /*
321 * public API
322 */
324 int
325 sdb_fe_analyze(sdb_conn_node_t *node, sdb_strbuf_t *errbuf)
326 {
327 sdb_store_matcher_t *m = NULL, *filter = NULL;
328 int context = -1;
329 int status = 0;
331 if (! node)
332 return -1;
334 /* For now, this function checks basic matcher attributes only;
335 * later, this may be turned into one of multiple AST visitors. */
336 if (node->cmd == SDB_CONNECTION_FETCH) {
337 conn_fetch_t *fetch = CONN_FETCH(node);
338 if ((fetch->type == SDB_HOST) && fetch->name) {
339 sdb_strbuf_sprintf(errbuf, "Unexpected STRING '%s'", fetch->name);
340 return -1;
341 }
342 if ((fetch->type != SDB_HOST) && (! fetch->name)) {
343 sdb_strbuf_sprintf(errbuf, "Missing %s name",
344 SDB_STORE_TYPE_TO_NAME(fetch->type));
345 return -1;
346 }
347 if (fetch->filter)
348 filter = fetch->filter->matcher;
349 context = fetch->type;
350 }
351 else if (node->cmd == SDB_CONNECTION_LIST) {
352 if (CONN_LIST(node)->filter)
353 filter = CONN_LIST(node)->filter->matcher;
354 context = CONN_LIST(node)->type;
355 }
356 else if (node->cmd == SDB_CONNECTION_LOOKUP) {
357 if (CONN_LOOKUP(node)->matcher)
358 m = CONN_LOOKUP(node)->matcher->matcher;
359 if (CONN_LOOKUP(node)->filter)
360 filter = CONN_LOOKUP(node)->filter->matcher;
361 context = CONN_LOOKUP(node)->type;
362 }
363 else if ((node->cmd == SDB_CONNECTION_STORE_HOST)
364 || (node->cmd == SDB_CONNECTION_STORE_SERVICE)
365 || (node->cmd == SDB_CONNECTION_STORE_METRIC)
366 || (node->cmd == SDB_CONNECTION_STORE_ATTRIBUTE)) {
367 return 0;
368 }
369 else if (node->cmd == SDB_CONNECTION_TIMESERIES) {
370 return 0;
371 }
372 else {
373 sdb_strbuf_sprintf(errbuf,
374 "Don't know how to analyze command %#x", node->cmd);
375 return -1;
376 }
378 if (analyze_matcher(context, -1, m, errbuf))
379 status = -1;
380 if (analyze_matcher(-1, -1, filter, errbuf))
381 status = -1;
382 return status;
383 } /* sdb_fe_analyze */
385 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */