actions: introduce function typedef for creating actions from buffer
[lttng-tools.git] / src / common / actions / action.c
CommitLineData
a58c490f 1/*
ab5be9fa 2 * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
a58c490f 3 *
ab5be9fa 4 * SPDX-License-Identifier: LGPL-2.1-only
a58c490f 5 *
a58c490f
JG
6 */
7
8#include <lttng/action/action-internal.h>
9#include <lttng/action/notify-internal.h>
10#include <common/error.h>
11#include <assert.h>
12
13enum lttng_action_type lttng_action_get_type(struct lttng_action *action)
14{
15 return action ? action->type : LTTNG_ACTION_TYPE_UNKNOWN;
16}
17
9b63a4aa
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18LTTNG_HIDDEN
19enum lttng_action_type lttng_action_get_type_const(
20 const struct lttng_action *action)
21{
22 return action->type;
23}
24
a58c490f
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25void lttng_action_destroy(struct lttng_action *action)
26{
27 if (!action) {
28 return;
29 }
30
31 assert(action->destroy);
32 action->destroy(action);
33}
34
35LTTNG_HIDDEN
36bool lttng_action_validate(struct lttng_action *action)
37{
38 bool valid;
39
40 if (!action) {
41 valid = false;
42 goto end;
43 }
44
45 if (!action->validate) {
46 /* Sub-class guarantees that it can never be invalid. */
47 valid = true;
48 goto end;
49 }
50
51 valid = action->validate(action);
52end:
53 return valid;
54}
55
56LTTNG_HIDDEN
3647288f
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57int lttng_action_serialize(struct lttng_action *action,
58 struct lttng_dynamic_buffer *buf)
a58c490f 59{
3647288f
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60 int ret;
61 struct lttng_action_comm action_comm = {
62 .action_type = (int8_t) action->type,
63 };
64
65 ret = lttng_dynamic_buffer_append(buf, &action_comm,
66 sizeof(action_comm));
67 if (ret) {
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68 goto end;
69 }
70
3647288f
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71 ret = action->serialize(action, buf);
72 if (ret) {
a58c490f
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73 goto end;
74 }
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75end:
76 return ret;
77}
78
79LTTNG_HIDDEN
80ssize_t lttng_action_create_from_buffer(const struct lttng_buffer_view *view,
869a3c2d 81 struct lttng_action **action)
a58c490f 82{
869a3c2d 83 ssize_t consumed_len, specific_action_consumed_len;
a58c490f 84 const struct lttng_action_comm *action_comm;
869a3c2d
SM
85 action_create_from_buffer_cb create_from_buffer_cb;
86 struct lttng_buffer_view specific_action_view;
a58c490f 87
869a3c2d
SM
88 if (!view || !action) {
89 consumed_len = -1;
a58c490f
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90 goto end;
91 }
92
93 action_comm = (const struct lttng_action_comm *) view->data;
869a3c2d 94
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95 DBG("Deserializing action from buffer");
96 switch (action_comm->action_type) {
97 case LTTNG_ACTION_TYPE_NOTIFY:
869a3c2d 98 create_from_buffer_cb = lttng_action_notify_create_from_buffer;
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99 break;
100 default:
869a3c2d 101 consumed_len = -1;
a58c490f
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102 goto end;
103 }
104
869a3c2d
SM
105 /* Create buffer view for the action-type-specific data. */
106 specific_action_view = lttng_buffer_view_from_view(view,
107 sizeof(struct lttng_action_comm),
108 view->size - sizeof(struct lttng_action_comm));
109
110 specific_action_consumed_len =
111 create_from_buffer_cb(&specific_action_view, action);
112 if (specific_action_consumed_len < 0) {
113 ERR("Failed to create specific action from buffer.");
114 consumed_len = -1;
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115 goto end;
116 }
869a3c2d
SM
117
118 assert(*action);
119
120 consumed_len = sizeof(struct lttng_action_comm) +
121 specific_action_consumed_len;
122
a58c490f 123end:
869a3c2d 124 return consumed_len;
a58c490f 125}
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