actions: introduce rotate session action
[lttng-tools.git] / src / common / actions / action.c
1 /*
2 * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
3 *
4 * SPDX-License-Identifier: LGPL-2.1-only
5 *
6 */
7
8 #include <assert.h>
9 #include <common/error.h>
10 #include <lttng/action/action-internal.h>
11 #include <lttng/action/notify-internal.h>
12 #include <lttng/action/rotate-session-internal.h>
13 #include <lttng/action/start-session-internal.h>
14 #include <lttng/action/stop-session-internal.h>
15
16 static const char *lttng_action_type_string(enum lttng_action_type action_type)
17 {
18 switch (action_type) {
19 case LTTNG_ACTION_TYPE_UNKNOWN:
20 return "UNKNOWN";
21 case LTTNG_ACTION_TYPE_NOTIFY:
22 return "NOTIFY";
23 case LTTNG_ACTION_TYPE_ROTATE_SESSION:
24 return "ROTATE_SESSION";
25 case LTTNG_ACTION_TYPE_START_SESSION:
26 return "START_SESSION";
27 case LTTNG_ACTION_TYPE_STOP_SESSION:
28 return "STOP_SESSION";
29 default:
30 return "???";
31 }
32 }
33
34 enum lttng_action_type lttng_action_get_type(struct lttng_action *action)
35 {
36 return action ? action->type : LTTNG_ACTION_TYPE_UNKNOWN;
37 }
38
39 LTTNG_HIDDEN
40 enum lttng_action_type lttng_action_get_type_const(
41 const struct lttng_action *action)
42 {
43 return action->type;
44 }
45
46 LTTNG_HIDDEN
47 void lttng_action_init(
48 struct lttng_action *action,
49 enum lttng_action_type type,
50 action_validate_cb validate,
51 action_serialize_cb serialize,
52 action_equal_cb equal,
53 action_destroy_cb destroy)
54 {
55 action->type = type;
56 action->validate = validate;
57 action->serialize = serialize;
58 action->equal = equal;
59 action->destroy = destroy;
60 }
61
62 void lttng_action_destroy(struct lttng_action *action)
63 {
64 if (!action) {
65 return;
66 }
67
68 assert(action->destroy);
69 action->destroy(action);
70 }
71
72 LTTNG_HIDDEN
73 bool lttng_action_validate(struct lttng_action *action)
74 {
75 bool valid;
76
77 if (!action) {
78 valid = false;
79 goto end;
80 }
81
82 if (!action->validate) {
83 /* Sub-class guarantees that it can never be invalid. */
84 valid = true;
85 goto end;
86 }
87
88 valid = action->validate(action);
89 end:
90 return valid;
91 }
92
93 LTTNG_HIDDEN
94 int lttng_action_serialize(struct lttng_action *action,
95 struct lttng_dynamic_buffer *buf)
96 {
97 int ret;
98 struct lttng_action_comm action_comm = {
99 .action_type = (int8_t) action->type,
100 };
101
102 ret = lttng_dynamic_buffer_append(buf, &action_comm,
103 sizeof(action_comm));
104 if (ret) {
105 goto end;
106 }
107
108 ret = action->serialize(action, buf);
109 if (ret) {
110 goto end;
111 }
112 end:
113 return ret;
114 }
115
116 LTTNG_HIDDEN
117 ssize_t lttng_action_create_from_buffer(const struct lttng_buffer_view *view,
118 struct lttng_action **action)
119 {
120 ssize_t consumed_len, specific_action_consumed_len;
121 const struct lttng_action_comm *action_comm;
122 action_create_from_buffer_cb create_from_buffer_cb;
123 struct lttng_buffer_view specific_action_view;
124
125 if (!view || !action) {
126 consumed_len = -1;
127 goto end;
128 }
129
130 action_comm = (const struct lttng_action_comm *) view->data;
131
132 DBG("Create action from buffer: action-type=%s",
133 lttng_action_type_string(action_comm->action_type));
134
135 switch (action_comm->action_type) {
136 case LTTNG_ACTION_TYPE_NOTIFY:
137 create_from_buffer_cb = lttng_action_notify_create_from_buffer;
138 break;
139 case LTTNG_ACTION_TYPE_ROTATE_SESSION:
140 create_from_buffer_cb =
141 lttng_action_rotate_session_create_from_buffer;
142 break;
143 case LTTNG_ACTION_TYPE_START_SESSION:
144 create_from_buffer_cb =
145 lttng_action_start_session_create_from_buffer;
146 break;
147 case LTTNG_ACTION_TYPE_STOP_SESSION:
148 create_from_buffer_cb =
149 lttng_action_stop_session_create_from_buffer;
150 break;
151 default:
152 ERR("Failed to create action from buffer, unhandled action type: action-type=%u (%s)",
153 action_comm->action_type,
154 lttng_action_type_string(
155 action_comm->action_type));
156 consumed_len = -1;
157 goto end;
158 }
159
160 /* Create buffer view for the action-type-specific data. */
161 specific_action_view = lttng_buffer_view_from_view(view,
162 sizeof(struct lttng_action_comm),
163 view->size - sizeof(struct lttng_action_comm));
164
165 specific_action_consumed_len =
166 create_from_buffer_cb(&specific_action_view, action);
167 if (specific_action_consumed_len < 0) {
168 ERR("Failed to create specific action from buffer.");
169 consumed_len = -1;
170 goto end;
171 }
172
173 assert(*action);
174
175 consumed_len = sizeof(struct lttng_action_comm) +
176 specific_action_consumed_len;
177
178 end:
179 return consumed_len;
180 }
181
182 LTTNG_HIDDEN
183 bool lttng_action_is_equal(const struct lttng_action *a,
184 const struct lttng_action *b)
185 {
186 bool is_equal = false;
187
188 if (!a || !b) {
189 goto end;
190 }
191
192 if (a->type != b->type) {
193 goto end;
194 }
195
196 if (a == b) {
197 is_equal = true;
198 goto end;
199 }
200
201 assert(a->equal);
202 is_equal = a->equal(a, b);
203 end:
204 return is_equal;
205 }
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