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1 | /* |
2 | * Copyright (C) 2019 EfficiOS, Inc. | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
11 | * for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public License | |
14 | * along with this library; if not, write to the Free Software Foundation, | |
15 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | ||
18 | #include <assert.h> | |
19 | #include <common/error.h> | |
20 | #include <common/macros.h> | |
21 | #include <lttng/action/action-internal.h> | |
22 | #include <lttng/action/group-internal.h> | |
23 | #include <lttng/action/group.h> | |
24 | ||
25 | struct lttng_action_group { | |
26 | struct lttng_action parent; | |
27 | ||
28 | /* Owned by this. */ | |
29 | struct lttng_action **elements; | |
30 | size_t n_elements; | |
31 | size_t n_elements_allocated; | |
32 | }; | |
33 | ||
34 | struct lttng_action_group_comm { | |
35 | uint32_t n_elements; | |
36 | ||
37 | /* | |
38 | * Variable data: each element serialized sequentially. | |
39 | */ | |
40 | char data[]; | |
41 | } LTTNG_PACKED; | |
42 | ||
43 | static struct lttng_action_group *action_group_from_action( | |
44 | const struct lttng_action *action) | |
45 | { | |
46 | assert(action); | |
47 | ||
48 | return container_of(action, struct lttng_action_group, parent); | |
49 | } | |
50 | ||
51 | static bool lttng_action_group_validate(struct lttng_action *action) | |
52 | { | |
53 | size_t i; | |
54 | struct lttng_action_group *action_group; | |
55 | bool valid; | |
56 | ||
57 | assert(lttng_action_get_type(action) == LTTNG_ACTION_TYPE_GROUP); | |
58 | ||
59 | action_group = action_group_from_action(action); | |
60 | ||
61 | for (i = 0; i < action_group->n_elements; i++) { | |
62 | struct lttng_action *child = action_group->elements[i]; | |
63 | ||
64 | assert(child); | |
65 | ||
66 | if (!lttng_action_validate(child)) { | |
67 | valid = false; | |
68 | goto end; | |
69 | } | |
70 | } | |
71 | ||
72 | valid = true; | |
73 | ||
74 | end: | |
75 | return valid; | |
76 | } | |
77 | ||
78 | static bool lttng_action_group_is_equal(const struct lttng_action *_a, const struct lttng_action *_b) | |
79 | { | |
80 | bool is_equal = false; | |
81 | struct lttng_action_group *a, *b; | |
82 | size_t i; | |
83 | ||
84 | assert(lttng_action_get_type_const(_a) == LTTNG_ACTION_TYPE_GROUP); | |
85 | assert(lttng_action_get_type_const(_b) == LTTNG_ACTION_TYPE_GROUP); | |
86 | ||
87 | a = action_group_from_action(_a); | |
88 | b = action_group_from_action(_b); | |
89 | ||
90 | if (a->n_elements != b->n_elements) { | |
91 | goto end; | |
92 | } | |
93 | ||
94 | for (i = 0; i < a->n_elements; i++) { | |
95 | struct lttng_action *child_a = a->elements[i]; | |
96 | struct lttng_action *child_b = b->elements[i]; | |
97 | ||
98 | assert(child_a); | |
99 | assert(child_b); | |
100 | ||
101 | if (!lttng_action_is_equal(child_a, child_b)) { | |
102 | goto end; | |
103 | } | |
104 | } | |
105 | ||
106 | is_equal = true; | |
107 | end: | |
108 | return is_equal; | |
109 | } | |
110 | ||
111 | static int lttng_action_group_serialize( | |
112 | struct lttng_action *action, struct lttng_dynamic_buffer *buf) | |
113 | { | |
114 | struct lttng_action_group *action_group; | |
115 | struct lttng_action_group_comm comm; | |
116 | int ret; | |
117 | size_t i; | |
118 | ||
119 | assert(action); | |
120 | assert(buf); | |
121 | assert(lttng_action_get_type(action) == LTTNG_ACTION_TYPE_GROUP); | |
122 | ||
123 | action_group = action_group_from_action(action); | |
124 | ||
125 | DBG("Serializing action group"); | |
126 | ||
127 | comm.n_elements = action_group->n_elements; | |
128 | ||
129 | ret = lttng_dynamic_buffer_append(buf, &comm, sizeof(comm)); | |
130 | if (ret) { | |
131 | ret = -1; | |
132 | goto end; | |
133 | } | |
134 | ||
135 | for (i = 0; i < action_group->n_elements; i++) { | |
136 | struct lttng_action *child = action_group->elements[i]; | |
137 | ||
138 | assert(child); | |
139 | ||
140 | ret = lttng_action_serialize(child, buf); | |
141 | if (ret) { | |
142 | goto end; | |
143 | } | |
144 | } | |
145 | ||
146 | ret = 0; | |
147 | ||
148 | end: | |
149 | return ret; | |
150 | } | |
151 | ||
152 | static void lttng_action_group_destroy(struct lttng_action *action) | |
153 | { | |
154 | struct lttng_action_group *action_group; | |
155 | size_t i; | |
156 | ||
157 | if (!action) { | |
158 | goto end; | |
159 | } | |
160 | ||
161 | action_group = action_group_from_action(action); | |
162 | ||
163 | for (i = 0; i < action_group->n_elements; i++) { | |
164 | struct lttng_action *child = action_group->elements[i]; | |
165 | ||
166 | assert(child); | |
167 | ||
168 | lttng_action_destroy(child); | |
169 | } | |
170 | ||
171 | free(action_group->elements); | |
172 | free(action_group); | |
173 | ||
174 | end: | |
175 | return; | |
176 | } | |
177 | ||
178 | ssize_t lttng_action_group_create_from_buffer( | |
179 | const struct lttng_buffer_view *view, | |
180 | struct lttng_action **p_action) | |
181 | { | |
182 | ssize_t consumed_len; | |
183 | struct lttng_action_group_comm *comm; | |
184 | struct lttng_action *group; | |
185 | struct lttng_action *child_action = NULL; | |
186 | enum lttng_action_status status; | |
187 | size_t i; | |
188 | ||
189 | group = lttng_action_group_create(); | |
190 | if (!group) { | |
191 | consumed_len = -1; | |
192 | goto end; | |
193 | } | |
194 | ||
195 | comm = (struct lttng_action_group_comm *) view->data; | |
196 | ||
197 | consumed_len = sizeof(struct lttng_action_group_comm); | |
198 | ||
199 | for (i = 0; i < comm->n_elements; i++) { | |
200 | ssize_t consumed_len_child; | |
201 | struct lttng_buffer_view child_view; | |
202 | ||
203 | child_view = lttng_buffer_view_from_view( | |
204 | view, consumed_len, view->size - consumed_len); | |
205 | consumed_len_child = lttng_action_create_from_buffer( | |
206 | &child_view, &child_action); | |
207 | ||
208 | status = lttng_action_group_add_action(group, child_action); | |
209 | if (status != LTTNG_ACTION_STATUS_OK) { | |
210 | consumed_len = -1; | |
211 | goto end; | |
212 | } | |
213 | child_action = NULL; | |
214 | ||
215 | consumed_len += consumed_len_child; | |
216 | } | |
217 | ||
218 | *p_action = group; | |
219 | group = NULL; | |
220 | ||
221 | end: | |
222 | lttng_action_group_destroy(group); | |
223 | lttng_action_destroy(child_action); | |
224 | ||
225 | return consumed_len; | |
226 | } | |
227 | ||
228 | struct lttng_action *lttng_action_group_create(void) | |
229 | { | |
230 | struct lttng_action_group *action_group; | |
231 | struct lttng_action *action; | |
232 | ||
233 | action_group = zmalloc(sizeof(struct lttng_action_group)); | |
234 | if (!action_group) { | |
235 | action = NULL; | |
236 | goto end; | |
237 | } | |
238 | ||
239 | action = &action_group->parent; | |
240 | ||
241 | lttng_action_init(action, LTTNG_ACTION_TYPE_GROUP, | |
242 | lttng_action_group_validate, | |
243 | lttng_action_group_serialize, | |
244 | lttng_action_group_is_equal, | |
245 | lttng_action_group_destroy); | |
246 | ||
247 | action_group->n_elements = 0; | |
248 | action_group->n_elements_allocated = 10; | |
249 | action_group->elements = zmalloc(10 * sizeof(struct lttng_action *)); | |
250 | if (!action_group->elements) { | |
251 | goto error; | |
252 | } | |
253 | ||
254 | goto end; | |
255 | ||
256 | error: | |
257 | lttng_action_group_destroy(action); | |
258 | action = NULL; | |
259 | ||
260 | end: | |
261 | return action; | |
262 | } | |
263 | ||
264 | enum lttng_action_status lttng_action_group_add_action( | |
265 | struct lttng_action *group, struct lttng_action *action) | |
266 | { | |
267 | struct lttng_action_group *action_group; | |
268 | enum lttng_action_status status; | |
269 | ||
270 | if (!group || | |
271 | (lttng_action_get_type(group) != | |
272 | LTTNG_ACTION_TYPE_GROUP) || | |
273 | !action) { | |
274 | status = LTTNG_ACTION_STATUS_INVALID; | |
275 | goto end; | |
276 | } | |
277 | ||
278 | /* | |
279 | * Don't allow adding groups in groups for now, since we're afraid of | |
280 | * cycles. | |
281 | */ | |
282 | if (lttng_action_get_type(action) == LTTNG_ACTION_TYPE_GROUP) { | |
283 | status = LTTNG_ACTION_STATUS_INVALID; | |
284 | goto end; | |
285 | } | |
286 | ||
287 | action_group = action_group_from_action(group); | |
288 | ||
289 | if (action_group->n_elements == action_group->n_elements_allocated) { | |
290 | // TODO: handle resize. | |
291 | status = LTTNG_ACTION_STATUS_ERROR; | |
292 | goto end; | |
293 | } | |
294 | ||
295 | action_group->elements[action_group->n_elements] = action; | |
296 | action_group->n_elements++; | |
297 | ||
298 | status = LTTNG_ACTION_STATUS_OK; | |
299 | end: | |
300 | return status; | |
301 | } | |
302 | ||
303 | enum lttng_action_status lttng_action_group_get_count( | |
304 | const struct lttng_action *group, unsigned int *count) | |
305 | { | |
306 | struct lttng_action_group *action_group; | |
307 | enum lttng_action_status status = LTTNG_ACTION_STATUS_OK; | |
308 | ||
309 | if (!group || (lttng_action_get_type_const(group) != | |
310 | LTTNG_ACTION_TYPE_GROUP)) { | |
311 | status = LTTNG_ACTION_STATUS_INVALID; | |
312 | *count = 0; | |
313 | goto end; | |
314 | } | |
315 | ||
316 | action_group = action_group_from_action(group); | |
317 | ||
318 | ||
319 | *count = action_group->n_elements; | |
320 | end: | |
321 | return status; | |
322 | } | |
323 | ||
324 | const struct lttng_action *lttng_action_group_get_at_index_const( | |
325 | const struct lttng_action *group, | |
326 | unsigned int index) | |
327 | { | |
328 | struct lttng_action_group *action_group; | |
329 | const struct lttng_action *action = NULL; | |
330 | ||
331 | if (!group || (lttng_action_get_type_const(group) != | |
332 | LTTNG_ACTION_TYPE_GROUP)) { | |
333 | goto end; | |
334 | } | |
335 | ||
336 | action_group = action_group_from_action(group); | |
337 | ||
338 | if (index >= action_group->n_elements) { | |
339 | goto end; | |
340 | } | |
341 | ||
342 | action = action_group->elements[index]; | |
343 | end: | |
344 | return action; | |
345 | } |