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9f263671 KS |
1 | /* |
2 | * Copyright (C) 2023 Kienan Stewart <kstewart@efficios.com> | |
3 | * | |
4 | * SPDX-License-Identifier: LGPL-2.1-only | |
5 | * | |
6 | */ | |
7 | ||
8 | #include "event_name.hpp" | |
9 | ||
10 | #include <assert.h> | |
11 | #include <babeltrace2/babeltrace.h> | |
12 | #include <stdlib.h> | |
13 | #include <string.h> | |
14 | #include <string> | |
15 | #include <unordered_set> | |
16 | ||
17 | struct event_name { | |
18 | std::unordered_set<std::string> names; | |
19 | const bt_value *names_value; | |
20 | /* weak reference */ | |
21 | bt_self_component_port_input *input_port; | |
22 | }; | |
23 | ||
24 | struct event_name_iterator_data { | |
25 | struct event_name *event_name; | |
26 | bt_message_iterator *iterator; | |
27 | }; | |
28 | ||
29 | bt_component_class_initialize_method_status | |
30 | event_name_initialize(bt_self_component_filter *self_comp, | |
31 | bt_self_component_filter_configuration *, | |
32 | const bt_value *params, | |
33 | void *) | |
34 | { | |
35 | bt_component_class_initialize_method_status status; | |
36 | bt_self_component_port_input *input_port; | |
37 | struct event_name *event_name; | |
38 | auto self = bt_self_component_filter_as_self_component(self_comp); | |
39 | if (bt_self_component_filter_add_input_port(self_comp, "in", nullptr, &input_port) != | |
40 | BT_SELF_COMPONENT_ADD_PORT_STATUS_OK) { | |
41 | BT_CURRENT_THREAD_ERROR_APPEND_CAUSE_FROM_COMPONENT(self, | |
42 | "Failed to add input port"); | |
43 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR; | |
44 | goto end; | |
45 | } | |
46 | ||
47 | if (bt_self_component_filter_add_output_port(self_comp, "out", nullptr, nullptr) != | |
48 | BT_SELF_COMPONENT_ADD_PORT_STATUS_OK) { | |
49 | BT_CURRENT_THREAD_ERROR_APPEND_CAUSE_FROM_COMPONENT(self, | |
50 | "Failed to add output port"); | |
51 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR; | |
52 | goto end; | |
53 | } | |
54 | ||
55 | event_name = new (std::nothrow) struct event_name; | |
56 | if (event_name == nullptr) { | |
57 | BT_CURRENT_THREAD_ERROR_APPEND_CAUSE_FROM_COMPONENT( | |
58 | self, "Failed to allocate memory for private component data"); | |
59 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR; | |
60 | goto end; | |
61 | } | |
62 | ||
63 | event_name->input_port = input_port; | |
64 | event_name->names_value = bt_value_map_borrow_entry_value_const(params, "names"); | |
65 | if (event_name->names_value == nullptr) { | |
66 | BT_CURRENT_THREAD_ERROR_APPEND_CAUSE_FROM_COMPONENT( | |
67 | self, "'names' parameter is required"); | |
68 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR; | |
69 | goto err_free; | |
70 | } | |
71 | if (bt_value_get_type(event_name->names_value) != BT_VALUE_TYPE_ARRAY) { | |
72 | BT_CURRENT_THREAD_ERROR_APPEND_CAUSE_FROM_COMPONENT( | |
73 | self, "'names' parameter must be an array"); | |
74 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR; | |
75 | goto err_free; | |
76 | } | |
77 | if (bt_value_array_is_empty(event_name->names_value)) { | |
78 | BT_CURRENT_THREAD_ERROR_APPEND_CAUSE_FROM_COMPONENT( | |
79 | bt_self_component_filter_as_self_component(self_comp), | |
80 | "'names' parameter must not be empty"); | |
81 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR; | |
82 | goto err_free; | |
83 | } | |
84 | for (uint64_t index = 0; index < bt_value_array_get_length(event_name->names_value); | |
85 | index++) { | |
86 | const bt_value *names_entry = bt_value_array_borrow_element_by_index_const( | |
87 | event_name->names_value, index); | |
88 | if (bt_value_get_type(names_entry) != BT_VALUE_TYPE_STRING) { | |
89 | BT_CURRENT_THREAD_ERROR_APPEND_CAUSE_FROM_COMPONENT( | |
90 | self, "All members of the 'names' parameter array must be strings"); | |
91 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR; | |
92 | goto err_free; | |
93 | } | |
94 | event_name->names.emplace(bt_value_string_get(names_entry)); | |
95 | } | |
96 | bt_value_get_ref(event_name->names_value); | |
97 | bt_self_component_set_data(self, event_name); | |
98 | status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK; | |
99 | goto end; | |
100 | ||
101 | err_free: | |
102 | delete event_name; | |
103 | end: | |
104 | return status; | |
105 | } | |
106 | ||
107 | void event_name_finalize(bt_self_component_filter *self_comp) | |
108 | { | |
109 | struct event_name *event_name = (struct event_name *) bt_self_component_get_data( | |
110 | bt_self_component_filter_as_self_component(self_comp)); | |
111 | bt_value_put_ref(event_name->names_value); | |
112 | delete event_name; | |
113 | } | |
114 | ||
115 | bt_message_iterator_class_initialize_method_status | |
116 | event_name_message_iterator_initialize(bt_self_message_iterator *self_message_iterator, | |
117 | bt_self_message_iterator_configuration *, | |
118 | bt_self_component_port_output *) | |
119 | { | |
120 | struct event_name *event_name = (struct event_name *) bt_self_component_get_data( | |
121 | bt_self_message_iterator_borrow_component(self_message_iterator)); | |
122 | assert(event_name); | |
123 | ||
124 | struct event_name_iterator_data *iter_data = | |
125 | (struct event_name_iterator_data *) malloc(sizeof(struct event_name_iterator_data)); | |
126 | ||
127 | if (iter_data == nullptr) { | |
128 | return BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR; | |
129 | } | |
130 | iter_data->event_name = event_name; | |
131 | ||
132 | if (bt_message_iterator_create_from_message_iterator( | |
133 | self_message_iterator, event_name->input_port, &iter_data->iterator) != | |
134 | BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_OK) { | |
135 | free(iter_data); | |
136 | return BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR; | |
137 | } | |
138 | ||
139 | bt_self_message_iterator_set_data(self_message_iterator, iter_data); | |
140 | ||
141 | return BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_OK; | |
142 | } | |
143 | ||
144 | void event_name_message_iterator_finalize(bt_self_message_iterator *self_message) | |
145 | { | |
146 | struct event_name_iterator_data *iter_data = | |
147 | (struct event_name_iterator_data *) bt_self_message_iterator_get_data(self_message); | |
148 | ||
149 | assert(iter_data); | |
150 | bt_message_iterator_put_ref(iter_data->iterator); | |
151 | free(iter_data); | |
152 | } | |
153 | ||
154 | static bool message_passes(const bt_message *message, const std::unordered_set<std::string>& names) | |
155 | { | |
156 | if (bt_message_get_type(message) != BT_MESSAGE_TYPE_EVENT) { | |
157 | return true; | |
158 | } | |
159 | ||
160 | const bt_event *event = bt_message_event_borrow_event_const(message); | |
161 | const bt_event_class *event_class = bt_event_borrow_class_const(event); | |
162 | const char *event_name = bt_event_class_get_name(event_class); | |
163 | ||
164 | if (event_name == nullptr) { | |
165 | return false; | |
166 | } | |
167 | ||
168 | if (names.find(event_name) != names.end()) { | |
169 | return true; | |
170 | } | |
171 | ||
172 | return false; | |
173 | } | |
174 | ||
175 | bt_message_iterator_class_next_method_status | |
176 | event_name_message_iterator_next(bt_self_message_iterator *self_message_iterator, | |
177 | bt_message_array_const messages, | |
178 | uint64_t, | |
179 | uint64_t *count) | |
180 | { | |
181 | bt_message_array_const upstream_messages; | |
182 | uint64_t upstream_message_count; | |
183 | uint64_t index = 0; | |
184 | bt_message_iterator_next_status next_status; | |
185 | bt_message_iterator_class_next_method_status status = | |
186 | BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK; | |
187 | struct event_name_iterator_data *iter_data = | |
188 | (struct event_name_iterator_data *) bt_self_message_iterator_get_data( | |
189 | self_message_iterator); | |
190 | struct event_name *event_name = (struct event_name *) bt_self_component_get_data( | |
191 | bt_self_message_iterator_borrow_component(self_message_iterator)); | |
192 | ||
193 | assert(event_name); | |
194 | assert(iter_data); | |
195 | ||
196 | while (index == 0) { | |
197 | next_status = bt_message_iterator_next( | |
198 | iter_data->iterator, &upstream_messages, &upstream_message_count); | |
199 | if (next_status != BT_MESSAGE_ITERATOR_NEXT_STATUS_OK) { | |
200 | status = static_cast<bt_message_iterator_class_next_method_status>( | |
201 | next_status); | |
202 | goto end; | |
203 | } | |
204 | ||
205 | for (uint64_t upstream_index = 0; upstream_index < upstream_message_count; | |
206 | upstream_index++) { | |
207 | const bt_message *upstream_message = upstream_messages[upstream_index]; | |
208 | if (message_passes(upstream_message, event_name->names)) { | |
209 | messages[index] = upstream_message; | |
210 | index++; | |
211 | } else { | |
212 | bt_message_put_ref(upstream_message); | |
213 | } | |
214 | } | |
215 | } | |
216 | ||
217 | *count = index; | |
218 | end: | |
219 | return status; | |
220 | } |