4 * Babeltrace Plugin Component Factory
6 * Copyright 2015 Jérémie Galarneau <jeremie.galarneau@efficios.com>
8 * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
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:
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
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
29 #include <babeltrace/plugin/component-factory.h>
30 #include <babeltrace/plugin/component-factory-internal.h>
31 #include <babeltrace/plugin/component-class-internal.h>
32 #include <babeltrace/plugin/source-internal.h>
33 #include <babeltrace/plugin/sink-internal.h>
34 #include <babeltrace/babeltrace-internal.h>
35 #include <babeltrace/compiler.h>
36 #include <babeltrace/ref.h>
43 #define NATIVE_PLUGIN_SUFFIX ".so"
44 #define NATIVE_PLUGIN_SUFFIX_LEN sizeof(NATIVE_PLUGIN_SUFFIX)
45 #define LIBTOOL_PLUGIN_SUFFIX ".la"
46 #define LIBTOOL_PLUGIN_SUFFIX_LEN sizeof(LIBTOOL_PLUGIN_SUFFIX)
47 #define PLUGIN_SUFFIX_LEN max_t(size_t, sizeof(NATIVE_PLUGIN_SUFFIX), \
48 sizeof(LIBTOOL_PLUGIN_SUFFIX))
50 /* Allocate dirent as recommended by READDIR(3), NOTES on readdir_r */
52 struct dirent
*alloc_dirent(const char *path
)
58 name_max
= pathconf(path
, _PC_NAME_MAX
);
62 len
= offsetof(struct dirent
, d_name
) + name_max
+ 1;
68 enum bt_component_factory_status
69 bt_component_factory_load_file(struct bt_component_factory
*factory
,
72 enum bt_component_factory_status ret
= BT_COMPONENT_FACTORY_STATUS_OK
;
73 enum bt_component_status component_status
;
76 struct bt_plugin
*plugin
;
77 bool is_libtool_wrapper
= false, is_shared_object
= false;
79 if (!factory
|| !path
) {
80 ret
= BT_COMPONENT_FACTORY_STATUS_INVAL
;
84 path_len
= strlen(path
);
85 if (path_len
<= PLUGIN_SUFFIX_LEN
) {
86 ret
= BT_COMPONENT_FACTORY_STATUS_INVAL
;
92 * Check if the file ends with a known plugin file type suffix (i.e. .so
95 is_libtool_wrapper
= !strncmp(LIBTOOL_PLUGIN_SUFFIX
,
96 path
+ path_len
- LIBTOOL_PLUGIN_SUFFIX_LEN
,
97 LIBTOOL_PLUGIN_SUFFIX_LEN
);
98 is_shared_object
= !strncmp(NATIVE_PLUGIN_SUFFIX
,
99 path
+ path_len
- NATIVE_PLUGIN_SUFFIX_LEN
,
100 NATIVE_PLUGIN_SUFFIX_LEN
);
101 if (!is_shared_object
&& !is_libtool_wrapper
) {
102 /* Name indicates that this is not a plugin file. */
103 ret
= BT_COMPONENT_FACTORY_STATUS_INVAL
;
107 module
= g_module_open(path
, 0);
109 printf_error("Module open error: %s", g_module_error());
110 ret
= BT_COMPONENT_FACTORY_STATUS_ERROR
;
114 /* Load plugin and make sure it defines the required entry points */
115 plugin
= bt_plugin_create(module
, path
);
117 ret
= BT_COMPONENT_FACTORY_STATUS_INVAL_PLUGIN
;
118 if (!g_module_close(module
)) {
119 printf_error("Module close error: %s",
125 factory
->current_plugin
= plugin
;
126 component_status
= bt_plugin_register_component_classes(plugin
,
128 factory
->current_plugin
= NULL
;
129 if (component_status
!= BT_COMPONENT_STATUS_OK
) {
130 switch (component_status
) {
131 case BT_COMPONENT_STATUS_NOMEM
:
132 ret
= BT_COMPONENT_FACTORY_STATUS_NOMEM
;
135 ret
= BT_COMPONENT_FACTORY_STATUS_ERROR
;
147 enum bt_component_factory_status
148 bt_component_factory_load_dir(struct bt_component_factory
*factory
,
149 const char *path
, bool recurse
)
151 DIR *directory
= NULL
;
152 struct dirent
*entry
= NULL
, *result
= NULL
;
153 char *file_path
= NULL
;
154 size_t path_len
= strlen(path
);
155 enum bt_component_factory_status ret
= BT_COMPONENT_FACTORY_STATUS_OK
;
157 if (path_len
>= PATH_MAX
) {
158 ret
= BT_COMPONENT_FACTORY_STATUS_INVAL
;
162 entry
= alloc_dirent(path
);
164 ret
= BT_COMPONENT_FACTORY_STATUS_NOMEM
;
168 file_path
= zmalloc(PATH_MAX
);
170 ret
= BT_COMPONENT_FACTORY_STATUS_NOMEM
;
174 strncpy(file_path
, path
, path_len
);
175 /* Append a trailing '/' to the path */
176 if (file_path
[path_len
- 1] != '/') {
177 file_path
[path_len
++] = '/';
180 directory
= opendir(file_path
);
182 perror("Failed to open plug-in directory");
183 ret
= BT_COMPONENT_FACTORY_STATUS_ERROR
;
187 /* Recursively walk directory */
188 while (!readdir_r(directory
, entry
, &result
) && result
) {
191 size_t file_name_len
;
193 if (result
->d_name
[0] == '.') {
194 /* Skip hidden files, . and .. */
198 file_name_len
= strlen(result
->d_name
);
200 if (path_len
+ file_name_len
>= PATH_MAX
) {
204 strncpy(file_path
+ path_len
, result
->d_name
, file_name_len
);
205 file_path
[path_len
+ file_name_len
] = '\0';
207 stat_ret
= stat(file_path
, &st
);
209 /* Continue to next file / directory. */
210 printf_perror("Failed to stat() plugin file");
214 if (S_ISDIR(st
.st_mode
) && recurse
) {
215 ret
= bt_component_factory_load_dir(factory
,
217 if (ret
!= BT_COMPONENT_FACTORY_STATUS_OK
) {
220 } else if (S_ISREG(st
.st_mode
)) {
221 bt_component_factory_load_file(factory
, file_path
);
226 if (closedir(directory
)) {
228 * We don't want to override the error since there is
231 perror("Failed to close plug-in directory");
240 void bt_component_factory_destroy(struct bt_object
*obj
)
242 struct bt_component_factory
*factory
= NULL
;
245 factory
= container_of(obj
, struct bt_component_factory
, base
);
247 if (factory
->component_classes
) {
248 g_ptr_array_free(factory
->component_classes
, TRUE
);
253 struct bt_component_factory
*bt_component_factory_create(void)
255 struct bt_component_factory
*factory
;
257 factory
= g_new0(struct bt_component_factory
, 1);
262 bt_object_init(factory
, bt_component_factory_destroy
);
263 factory
->component_classes
= g_ptr_array_new_with_free_func(
264 (GDestroyNotify
) bt_put
);
265 if (!factory
->component_classes
) {
275 int bt_component_factory_get_component_class_count(
276 struct bt_component_factory
*factory
)
278 return factory
? factory
->component_classes
->len
: -1;
281 struct bt_component_class
*bt_component_factory_get_component_class_index(
282 struct bt_component_factory
*factory
, int index
)
284 struct bt_component_class
*component_class
= NULL
;
286 if (!factory
|| index
< 0 || index
>= factory
->component_classes
->len
) {
290 component_class
= bt_get(g_ptr_array_index(
291 factory
->component_classes
, index
));
293 return component_class
;
296 struct bt_component_class
*bt_component_factory_get_component_class(
297 struct bt_component_factory
*factory
,
298 const char *plugin_name
, enum bt_component_type type
,
299 const char *component_name
)
302 struct bt_component_class
*component_class
= NULL
;
304 if (!factory
|| (!plugin_name
&& !component_name
&&
305 type
== BT_COMPONENT_TYPE_UNKNOWN
)) {
306 /* At least one criterion must be provided. */
310 for (i
= 0; i
< factory
->component_classes
->len
; i
++) {
311 struct bt_plugin
*plugin
= NULL
;
313 component_class
= g_ptr_array_index(factory
->component_classes
,
315 plugin
= bt_component_class_get_plugin(component_class
);
318 if (type
!= BT_COMPONENT_TYPE_UNKNOWN
) {
319 if (type
!= bt_component_class_get_type(
326 const char *cur_plugin_name
= bt_plugin_get_name(
329 assert(cur_plugin_name
);
330 if (strcmp(plugin_name
, cur_plugin_name
)) {
335 if (component_name
) {
336 const char *cur_cc_name
= bt_component_class_get_name(
340 if (strcmp(component_name
, cur_cc_name
)) {
345 /* All criteria met. */
352 return bt_get(component_class
);
356 enum bt_component_factory_status
_bt_component_factory_load(
357 struct bt_component_factory
*factory
, const char *path
,
360 enum bt_component_factory_status ret
= BT_COMPONENT_FACTORY_STATUS_OK
;
362 if (!factory
|| !path
) {
363 ret
= BT_COMPONENT_FACTORY_STATUS_INVAL
;
367 if (!g_file_test(path
, G_FILE_TEST_EXISTS
)) {
368 ret
= BT_COMPONENT_FACTORY_STATUS_NOENT
;
372 if (g_file_test(path
, G_FILE_TEST_IS_DIR
)) {
373 ret
= bt_component_factory_load_dir(factory
, path
, recursive
);
374 } else if (g_file_test(path
, G_FILE_TEST_IS_REGULAR
) ||
375 g_file_test(path
, G_FILE_TEST_IS_SYMLINK
)) {
376 ret
= bt_component_factory_load_file(factory
, path
);
378 ret
= BT_COMPONENT_FACTORY_STATUS_INVAL
;
385 enum bt_component_factory_status
bt_component_factory_load_recursive(
386 struct bt_component_factory
*factory
, const char *path
)
388 return _bt_component_factory_load(factory
, path
, true);
391 enum bt_component_factory_status
bt_component_factory_load(
392 struct bt_component_factory
*factory
, const char *path
)
394 return _bt_component_factory_load(factory
, path
, false);
398 enum bt_component_factory_status
399 add_component_class(struct bt_component_factory
*factory
, const char *name
,
400 const char *description
, bt_component_init_cb init
,
401 enum bt_component_type type
)
403 struct bt_component_class
*component_class
;
404 enum bt_component_factory_status ret
= BT_COMPONENT_FACTORY_STATUS_OK
;
406 if (!factory
|| !name
|| !init
) {
407 ret
= BT_COMPONENT_FACTORY_STATUS_INVAL
;
410 assert(factory
->current_plugin
);
413 * Ensure this component class does not clash with a currently
416 component_class
= bt_component_factory_get_component_class(factory
,
417 bt_plugin_get_name(factory
->current_plugin
), type
, name
);
418 if (component_class
) {
419 struct bt_plugin
*plugin
= bt_component_class_get_plugin(
422 printf_warning("Duplicate component class registration attempted. Component class %s being registered by plugin %s (path: %s) conflicts with one already registered by plugin %s (path: %s)",
423 name
, bt_plugin_get_name(factory
->current_plugin
),
424 bt_plugin_get_path(factory
->current_plugin
),
425 bt_plugin_get_name(plugin
),
426 bt_plugin_get_path(plugin
));
427 ret
= BT_COMPONENT_FACTORY_STATUS_DUPLICATE
;
428 BT_PUT(component_class
);
433 component_class
= bt_component_class_create(type
, name
, description
,
434 init
, factory
->current_plugin
);
435 g_ptr_array_add(factory
->component_classes
, component_class
);
440 enum bt_component_factory_status
441 bt_component_factory_register_source_component_class(
442 struct bt_component_factory
*factory
, const char *name
,
443 const char *description
, bt_component_init_cb init
)
445 return add_component_class(factory
, name
, description
, init
,
446 BT_COMPONENT_TYPE_SOURCE
);
449 enum bt_component_factory_status
450 bt_component_factory_register_sink_component_class(
451 struct bt_component_factory
*factory
, const char *name
,
452 const char *description
, bt_component_init_cb init
)
454 return add_component_class(factory
, name
, description
, init
,
455 BT_COMPONENT_TYPE_SINK
);