SoW-2020-0002: Trace Hit Counters: trigger error reporting integration
[lttng-tools.git] / include / lttng / condition / event-rule-internal.h
1 /*
2 * Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
3 *
4 * SPDX-License-Identifier: LGPL-2.1-only
5 *
6 */
7
8 #ifndef LTTNG_CONDITION_event_rule_INTERNAL_H
9 #define LTTNG_CONDITION_event_rule_INTERNAL_H
10
11 #include <lttng/condition/condition-internal.h>
12 #include <common/buffer-view.h>
13 #include <common/macros.h>
14 #include <lttng/condition/evaluation-internal.h>
15 #include <common/dynamic-array.h>
16 #include <lttng/event-field-value.h>
17
18 struct lttng_capture_descriptor {
19 /* The index at which the capture for this descriptor in the received
20 * payload from the tracer. This is populated on sessiond side.
21 * -1 is uninitialized.
22 * This is necessary since a single trigger can have multiple notify
23 * action, only an ordered set of capture desciptor is passed to the tracer.
24 */
25 int32_t capture_index;
26 struct lttng_event_expr *event_expression;
27 };
28
29 struct lttng_condition_event_rule {
30 struct lttng_condition parent;
31 struct lttng_event_rule *rule;
32
33 /* Array of `struct lttng_capture_descriptor *` */
34 struct lttng_dynamic_pointer_array capture_descriptors;
35 };
36
37 struct lttng_evaluation_event_rule {
38 struct lttng_evaluation parent;
39 char *name;
40
41 /* MessagePack-encoded captured event field values */
42 struct lttng_dynamic_buffer capture_payload;
43
44 /*
45 * The content of this array event field value is the decoded
46 * version of `capture_payload` above.
47 *
48 * This is a cache: it's not serialized/deserialized in
49 * communications from/to the library and the session daemon.
50 */
51 struct lttng_event_field_value *captured_values;
52 };
53
54 struct lttng_evaluation_event_rule_comm {
55 uint32_t trigger_name_length;
56 /* Trigger name */
57 char payload[];
58 } LTTNG_PACKED;
59
60 struct lttng_condition_event_rule_capture_bytecode_element
61 {
62 struct lttng_event_expr *expression;
63 struct lttng_bytecode *bytecode;
64 };
65
66 LTTNG_HIDDEN
67 ssize_t lttng_condition_event_rule_create_from_payload(
68 struct lttng_payload_view *view,
69 struct lttng_condition **condition);
70
71 LTTNG_HIDDEN
72 enum lttng_condition_status
73 lttng_condition_event_rule_get_rule_mutable(
74 const struct lttng_condition *condition,
75 struct lttng_event_rule **rule);
76
77 LTTNG_HIDDEN
78 struct lttng_evaluation *lttng_evaluation_event_rule_create(
79 const struct lttng_condition_event_rule *condition,
80 const char* trigger_name,
81 const char *capture_payload, size_t capture_payload_size,
82 bool decode_capture_payload);
83
84 LTTNG_HIDDEN
85 ssize_t lttng_evaluation_event_rule_create_from_payload(
86 const struct lttng_condition_event_rule *condition,
87 struct lttng_payload_view *view,
88 struct lttng_evaluation **_evaluation);
89
90 /*
91 * The returned `lttng_dynamic_pointer_array` contains a index ordered set of
92 * `lttng_condition_event_rule_capture_bytecode_element`.
93 * This ensure that minimal work will be done by the tracer for cases where
94 * multiple identical capture expression are present.
95 */
96 LTTNG_HIDDEN
97 enum lttng_error_code
98 lttng_condition_event_rule_generate_capture_descriptor_bytecode_set(
99 struct lttng_condition *condition,
100 struct lttng_dynamic_pointer_array *bytecode_set);
101
102 LTTNG_HIDDEN
103 struct lttng_capture_descriptor *
104 lttng_condition_event_rule_get_internal_capture_descriptor_at_index(
105 const struct lttng_condition *condition, unsigned int index);
106
107 #endif /* LTTNG_CONDITION_event_rule_INTERNAL_H */
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