Commit | Line | Data |
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784cdc68 | 1 | /* |
7d55361f | 2 | * connection.c |
784cdc68 JG |
3 | * |
4 | * Babeltrace Connection | |
5 | * | |
6 | * Copyright 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
7 | * | |
8 | * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
9 | * | |
10 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
11 | * of this software and associated documentation files (the "Software"), to deal | |
12 | * in the Software without restriction, including without limitation the rights | |
13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
14 | * copies of the Software, and to permit persons to whom the Software is | |
15 | * furnished to do so, subject to the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice shall be included in | |
18 | * all copies or substantial portions of the Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
23 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
26 | * SOFTWARE. | |
27 | */ | |
28 | ||
a36bfb16 PP |
29 | #define BT_LOG_TAG "CONNECTION" |
30 | #include <babeltrace/lib-logging-internal.h> | |
31 | ||
b2e0c907 PP |
32 | #include <babeltrace/graph/notification-iterator-internal.h> |
33 | #include <babeltrace/graph/component-internal.h> | |
34 | #include <babeltrace/graph/component-source-internal.h> | |
35 | #include <babeltrace/graph/component-filter-internal.h> | |
36 | #include <babeltrace/graph/connection-internal.h> | |
37 | #include <babeltrace/graph/private-connection.h> | |
38 | #include <babeltrace/graph/graph-internal.h> | |
39 | #include <babeltrace/graph/port-internal.h> | |
784cdc68 | 40 | #include <babeltrace/object-internal.h> |
3d9990ac | 41 | #include <babeltrace/compiler-internal.h> |
0fbb9a9f | 42 | #include <stdlib.h> |
784cdc68 JG |
43 | #include <glib.h> |
44 | ||
45 | static | |
46 | void bt_connection_destroy(struct bt_object *obj) | |
47 | { | |
48 | struct bt_connection *connection = container_of(obj, | |
49 | struct bt_connection, base); | |
bd14d768 PP |
50 | size_t i; |
51 | ||
a36bfb16 PP |
52 | BT_LOGD("Destroying connection: addr=%p", connection); |
53 | ||
bd14d768 PP |
54 | /* |
55 | * Make sure that each notification iterator which was created | |
56 | * for this connection is finalized before we destroy it. Once a | |
57 | * notification iterator is finalized, all its method return | |
58 | * NULL or the BT_NOTIFICATION_ITERATOR_STATUS_CANCELED status. | |
59 | * | |
60 | * Because connections are destroyed before components within a | |
61 | * graph, this ensures that notification iterators are always | |
62 | * finalized before their upstream component. | |
63 | */ | |
64 | if (connection->iterators) { | |
65 | for (i = 0; i < connection->iterators->len; i++) { | |
66 | struct bt_notification_iterator *iterator = | |
67 | g_ptr_array_index(connection->iterators, i); | |
68 | ||
a36bfb16 PP |
69 | BT_LOGD("Finalizing notification iterator created by this connection: " |
70 | "iter-addr=%p", iterator); | |
bd14d768 PP |
71 | bt_notification_iterator_finalize(iterator); |
72 | ||
73 | /* | |
74 | * Make sure this iterator does not try to | |
75 | * remove itself from this connection's | |
76 | * iterators on destruction because this | |
77 | * connection won't exist anymore. | |
78 | */ | |
79 | bt_notification_iterator_set_connection(iterator, | |
80 | NULL); | |
81 | } | |
82 | ||
83 | g_ptr_array_free(connection->iterators, TRUE); | |
84 | } | |
784cdc68 JG |
85 | |
86 | /* | |
87 | * No bt_put on ports as a connection only holds _weak_ references | |
88 | * to them. | |
89 | */ | |
90 | g_free(connection); | |
91 | } | |
92 | ||
f167d3c0 PP |
93 | static |
94 | void bt_connection_try_remove_from_graph(struct bt_connection *connection) | |
95 | { | |
96 | void *graph = bt_object_borrow_parent(&connection->base); | |
97 | ||
98 | if (connection->base.ref_count.count > 0 || | |
99 | connection->downstream_port || | |
100 | connection->upstream_port || | |
101 | connection->iterators->len > 0) { | |
102 | return; | |
103 | } | |
104 | ||
105 | /* | |
106 | * At this point we know that: | |
107 | * | |
a36bfb16 | 108 | * 1. The connection is ended (ports were disconnected). |
f167d3c0 PP |
109 | * 2. All the notification iterators that this connection |
110 | * created, if any, are finalized. | |
111 | * 3. The connection's reference count is 0, so only the | |
112 | * parent (graph) owns this connection after this call. | |
113 | * | |
114 | * In other words, no other object than the graph knows this | |
115 | * connection. | |
116 | * | |
117 | * It is safe to remove the connection from the graph, therefore | |
118 | * destroying it. | |
119 | */ | |
a36bfb16 PP |
120 | BT_LOGD("Removing self from graph's connections: " |
121 | "graph-addr=%p, conn-addr=%p", graph, connection); | |
f167d3c0 PP |
122 | bt_graph_remove_connection(graph, connection); |
123 | } | |
124 | ||
125 | static | |
126 | void bt_connection_parent_is_owner(struct bt_object *obj) | |
127 | { | |
128 | struct bt_connection *connection = container_of(obj, | |
129 | struct bt_connection, base); | |
130 | ||
131 | bt_connection_try_remove_from_graph(connection); | |
132 | } | |
133 | ||
890882ef PP |
134 | struct bt_connection *bt_connection_from_private_connection( |
135 | struct bt_private_connection *private_connection) | |
136 | { | |
137 | return bt_get(bt_connection_from_private(private_connection)); | |
138 | } | |
139 | ||
784cdc68 JG |
140 | BT_HIDDEN |
141 | struct bt_connection *bt_connection_create( | |
142 | struct bt_graph *graph, | |
72b913fb PP |
143 | struct bt_port *upstream_port, |
144 | struct bt_port *downstream_port) | |
784cdc68 JG |
145 | { |
146 | struct bt_connection *connection = NULL; | |
147 | ||
72b913fb | 148 | if (bt_port_get_type(upstream_port) != BT_PORT_TYPE_OUTPUT) { |
a36bfb16 | 149 | BT_LOGW_STR("Invalid parameter: upstream port is not an output port."); |
784cdc68 JG |
150 | goto end; |
151 | } | |
72b913fb | 152 | if (bt_port_get_type(downstream_port) != BT_PORT_TYPE_INPUT) { |
a36bfb16 | 153 | BT_LOGW_STR("Invalid parameter: downstream port is not an input port."); |
784cdc68 JG |
154 | goto end; |
155 | } | |
156 | ||
a36bfb16 PP |
157 | BT_LOGD("Creating connection: " |
158 | "graph-addr=%p, upstream-port-addr=%p, uptream-port-name=\"%s\", " | |
159 | "downstream-port-addr=%p, downstream-port-name=\"%s\"", | |
160 | graph, upstream_port, bt_port_get_name(upstream_port), | |
161 | downstream_port, bt_port_get_name(downstream_port)); | |
784cdc68 JG |
162 | connection = g_new0(struct bt_connection, 1); |
163 | if (!connection) { | |
a36bfb16 | 164 | BT_LOGE_STR("Failed to allocate one connection."); |
784cdc68 JG |
165 | goto end; |
166 | } | |
167 | ||
168 | bt_object_init(connection, bt_connection_destroy); | |
f167d3c0 PP |
169 | bt_object_set_parent_is_owner_listener(connection, |
170 | bt_connection_parent_is_owner); | |
bd14d768 PP |
171 | connection->iterators = g_ptr_array_new(); |
172 | if (!connection->iterators) { | |
a36bfb16 | 173 | BT_LOGE_STR("Failed to allocate a GPtrArray."); |
bd14d768 PP |
174 | BT_PUT(connection); |
175 | goto end; | |
176 | } | |
177 | ||
784cdc68 | 178 | /* Weak references are taken, see comment in header. */ |
72b913fb PP |
179 | connection->upstream_port = upstream_port; |
180 | connection->downstream_port = downstream_port; | |
a36bfb16 | 181 | BT_LOGD_STR("Setting upstream port's connection."); |
72b913fb | 182 | bt_port_set_connection(upstream_port, connection); |
a36bfb16 | 183 | BT_LOGD_STR("Setting downstream port's connection."); |
72b913fb | 184 | bt_port_set_connection(downstream_port, connection); |
784cdc68 | 185 | bt_object_set_parent(connection, &graph->base); |
a36bfb16 PP |
186 | BT_LOGD("Created connection: " |
187 | "graph-addr=%p, upstream-port-addr=%p, uptream-port-name=\"%s\", " | |
188 | "downstream-port-addr=%p, downstream-port-name=\"%s\", " | |
189 | "conn-addr=%p", | |
190 | graph, upstream_port, bt_port_get_name(upstream_port), | |
191 | downstream_port, bt_port_get_name(downstream_port), | |
192 | connection); | |
193 | ||
784cdc68 JG |
194 | end: |
195 | return connection; | |
196 | } | |
197 | ||
72b913fb | 198 | BT_HIDDEN |
2038affb | 199 | void bt_connection_disconnect_ports(struct bt_connection *conn) |
72b913fb PP |
200 | { |
201 | struct bt_component *downstream_comp = NULL; | |
202 | struct bt_component *upstream_comp = NULL; | |
203 | struct bt_port *downstream_port = conn->downstream_port; | |
204 | struct bt_port *upstream_port = conn->upstream_port; | |
f167d3c0 PP |
205 | struct bt_graph *graph = (void *) bt_object_borrow_parent(conn); |
206 | size_t i; | |
72b913fb PP |
207 | |
208 | if (downstream_port) { | |
209 | downstream_comp = bt_port_get_component(downstream_port); | |
210 | bt_port_set_connection(downstream_port, NULL); | |
211 | conn->downstream_port = NULL; | |
212 | } | |
213 | ||
214 | if (upstream_port) { | |
215 | upstream_comp = bt_port_get_component(upstream_port); | |
216 | bt_port_set_connection(upstream_port, NULL); | |
217 | conn->upstream_port = NULL; | |
218 | } | |
219 | ||
2038affb | 220 | if (downstream_comp) { |
a36bfb16 | 221 | /* bt_component_port_disconnected() logs details */ |
72b913fb PP |
222 | bt_component_port_disconnected(downstream_comp, |
223 | downstream_port); | |
224 | } | |
225 | ||
2038affb | 226 | if (upstream_comp) { |
a36bfb16 | 227 | /* bt_component_port_disconnected() logs details */ |
72b913fb PP |
228 | bt_component_port_disconnected(upstream_comp, upstream_port); |
229 | } | |
230 | ||
f345f8bb | 231 | assert(graph); |
a36bfb16 | 232 | /* bt_graph_notify_ports_disconnected() logs details */ |
f345f8bb PP |
233 | bt_graph_notify_ports_disconnected(graph, upstream_comp, |
234 | downstream_comp, upstream_port, downstream_port); | |
72b913fb PP |
235 | bt_put(downstream_comp); |
236 | bt_put(upstream_comp); | |
f167d3c0 PP |
237 | |
238 | /* | |
a36bfb16 | 239 | * Because this connection is ended, finalize (cancel) each |
f167d3c0 PP |
240 | * notification iterator created from it. |
241 | */ | |
242 | for (i = 0; i < conn->iterators->len; i++) { | |
243 | struct bt_notification_iterator *iterator = | |
244 | g_ptr_array_index(conn->iterators, i); | |
245 | ||
a36bfb16 PP |
246 | BT_LOGD("Finalizing notification iterator created by this ended connection: " |
247 | "conn-addr=%p, iter-addr=%p", conn, iterator); | |
f167d3c0 PP |
248 | bt_notification_iterator_finalize(iterator); |
249 | ||
250 | /* | |
251 | * Make sure this iterator does not try to remove itself | |
252 | * from this connection's iterators on destruction | |
253 | * because this connection won't exist anymore. | |
254 | */ | |
255 | bt_notification_iterator_set_connection(iterator, | |
256 | NULL); | |
257 | } | |
258 | ||
259 | g_ptr_array_set_size(conn->iterators, 0); | |
260 | bt_connection_try_remove_from_graph(conn); | |
72b913fb PP |
261 | } |
262 | ||
263 | struct bt_port *bt_connection_get_upstream_port( | |
784cdc68 JG |
264 | struct bt_connection *connection) |
265 | { | |
72b913fb | 266 | return connection ? bt_get(connection->upstream_port) : NULL; |
784cdc68 JG |
267 | } |
268 | ||
72b913fb | 269 | struct bt_port *bt_connection_get_downstream_port( |
784cdc68 JG |
270 | struct bt_connection *connection) |
271 | { | |
72b913fb | 272 | return connection ? bt_get(connection->downstream_port) : NULL; |
784cdc68 JG |
273 | } |
274 | ||
275 | struct bt_notification_iterator * | |
890882ef | 276 | bt_private_connection_create_notification_iterator( |
fa054faf PP |
277 | struct bt_private_connection *private_connection, |
278 | const enum bt_notification_type *notification_types) | |
784cdc68 | 279 | { |
890882ef PP |
280 | enum bt_component_class_type upstream_comp_class_type; |
281 | struct bt_notification_iterator *iterator = NULL; | |
282 | struct bt_port *upstream_port = NULL; | |
784cdc68 | 283 | struct bt_component *upstream_component = NULL; |
890882ef PP |
284 | struct bt_component_class *upstream_comp_class = NULL; |
285 | struct bt_connection *connection = NULL; | |
286 | bt_component_class_notification_iterator_init_method init_method = NULL; | |
fa054faf PP |
287 | static const enum bt_notification_type all_notif_types[] = { |
288 | BT_NOTIFICATION_TYPE_ALL, | |
289 | BT_NOTIFICATION_TYPE_SENTINEL, | |
290 | }; | |
784cdc68 | 291 | |
890882ef | 292 | if (!private_connection) { |
a36bfb16 | 293 | BT_LOGW_STR("Invalid parameter: private connection is NULL."); |
890882ef | 294 | goto error; |
784cdc68 JG |
295 | } |
296 | ||
fa054faf | 297 | if (!notification_types) { |
a36bfb16 | 298 | BT_LOGD_STR("No notification types: subscribing to all notifications."); |
fa054faf PP |
299 | notification_types = all_notif_types; |
300 | } | |
301 | ||
890882ef | 302 | connection = bt_connection_from_private(private_connection); |
72b913fb | 303 | if (!connection->upstream_port || !connection->downstream_port) { |
a36bfb16 PP |
304 | BT_LOGW("Invalid parameter: connection is ended: " |
305 | "conn-addr=%p", connection); | |
890882ef | 306 | goto error; |
72b913fb PP |
307 | } |
308 | ||
890882ef PP |
309 | upstream_port = connection->upstream_port; |
310 | assert(upstream_port); | |
311 | upstream_component = bt_port_get_component(upstream_port); | |
784cdc68 | 312 | assert(upstream_component); |
890882ef | 313 | upstream_comp_class = upstream_component->class; |
a36bfb16 PP |
314 | BT_LOGD("Creating notification iterator from connection: " |
315 | "conn-addr=%p, upstream-port-addr=%p, " | |
316 | "upstream-port-name=\"%s\", upstream-comp-addr=%p, " | |
317 | "upstream-comp-name=\"%s\"", | |
318 | connection, connection->upstream_port, | |
319 | bt_port_get_name(connection->upstream_port), | |
320 | upstream_component, bt_component_get_name(upstream_component)); | |
890882ef PP |
321 | upstream_comp_class_type = |
322 | bt_component_get_class_type(upstream_component); | |
323 | if (upstream_comp_class_type != BT_COMPONENT_CLASS_TYPE_SOURCE && | |
324 | upstream_comp_class_type != BT_COMPONENT_CLASS_TYPE_FILTER) { | |
325 | /* Unsupported operation. */ | |
a36bfb16 PP |
326 | BT_LOGW("Upstream component's class is not a source or filter component class: " |
327 | "comp-class-type=%s", | |
328 | bt_component_class_type_string(upstream_comp_class_type)); | |
890882ef PP |
329 | goto error; |
330 | } | |
784cdc68 | 331 | |
3230ee6b | 332 | iterator = bt_notification_iterator_create(upstream_component, |
bd14d768 | 333 | upstream_port, notification_types, connection); |
890882ef | 334 | if (!iterator) { |
a36bfb16 | 335 | BT_LOGW("Cannot create notification iterator from connection."); |
890882ef PP |
336 | goto error; |
337 | } | |
338 | ||
339 | switch (upstream_comp_class_type) { | |
784cdc68 | 340 | case BT_COMPONENT_CLASS_TYPE_SOURCE: |
890882ef PP |
341 | { |
342 | struct bt_component_class_source *source_class = | |
343 | container_of(upstream_comp_class, | |
344 | struct bt_component_class_source, parent); | |
345 | init_method = source_class->methods.iterator.init; | |
784cdc68 | 346 | break; |
890882ef | 347 | } |
784cdc68 | 348 | case BT_COMPONENT_CLASS_TYPE_FILTER: |
890882ef PP |
349 | { |
350 | struct bt_component_class_filter *filter_class = | |
351 | container_of(upstream_comp_class, | |
352 | struct bt_component_class_filter, parent); | |
353 | init_method = filter_class->methods.iterator.init; | |
784cdc68 | 354 | break; |
890882ef | 355 | } |
784cdc68 | 356 | default: |
890882ef | 357 | /* Unreachable. */ |
0fbb9a9f | 358 | abort(); |
890882ef PP |
359 | } |
360 | ||
361 | if (init_method) { | |
a36bfb16 PP |
362 | enum bt_notification_iterator_status status; |
363 | ||
364 | BT_LOGD("Calling user's initialization method: iter-addr=%p", | |
365 | iterator); | |
366 | status = init_method( | |
91457551 PP |
367 | bt_private_notification_iterator_from_notification_iterator(iterator), |
368 | bt_private_port_from_port(upstream_port)); | |
a36bfb16 PP |
369 | BT_LOGD("User method returned: status=%s", |
370 | bt_notification_iterator_status_string(status)); | |
890882ef | 371 | if (status < 0) { |
a36bfb16 | 372 | BT_LOGW_STR("Initialization method failed."); |
890882ef PP |
373 | goto error; |
374 | } | |
375 | } | |
376 | ||
bd14d768 | 377 | g_ptr_array_add(connection->iterators, iterator); |
a36bfb16 PP |
378 | BT_LOGD("Created notification iterator from connection: " |
379 | "conn-addr=%p, upstream-port-addr=%p, " | |
380 | "upstream-port-name=\"%s\", upstream-comp-addr=%p, " | |
381 | "upstream-comp-name=\"%s\", iter-addr=%p", | |
382 | connection, connection->upstream_port, | |
383 | bt_port_get_name(connection->upstream_port), | |
384 | upstream_component, bt_component_get_name(upstream_component), | |
385 | iterator); | |
890882ef PP |
386 | goto end; |
387 | ||
388 | error: | |
389 | BT_PUT(iterator); | |
390 | ||
784cdc68 JG |
391 | end: |
392 | bt_put(upstream_component); | |
890882ef | 393 | return iterator; |
784cdc68 | 394 | } |
bd14d768 PP |
395 | |
396 | BT_HIDDEN | |
397 | void bt_connection_remove_iterator(struct bt_connection *conn, | |
398 | struct bt_notification_iterator *iterator) | |
399 | { | |
400 | g_ptr_array_remove(conn->iterators, iterator); | |
a36bfb16 PP |
401 | BT_LOGV("Removed notification iterator from connection: " |
402 | "conn-addr=%p, iter-addr=%p", conn, iterator); | |
f167d3c0 | 403 | bt_connection_try_remove_from_graph(conn); |
bd14d768 | 404 | } |