plugins/ctf/fs/fs.c

   1 /*
   2  * fs.c
   3  *
   4  * Babeltrace CTF file system Reader Component
   5  *
   6  * Copyright 2016 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
  29 #include <babeltrace/plugin/plugin-system.h>
  30 #include <babeltrace/plugin/notification/iterator.h>
  31 #include <glib.h>
  32 #include <assert.h>
  33 #include <unistd.h>
  34 #include "fs.h"
  35
  36 static bool ctf_fs_debug;
  37
  38 static
  39 struct bt_notification *ctf_fs_iterator_get(
  40                 struct bt_notification_iterator *iterator)
  41 {
  42         return NULL;
  43 }
  44
  45 static
  46 enum bt_notification_iterator_status ctf_fs_iterator_next(
  47                 struct bt_notification_iterator *iterator)
  48 {
  49         return BT_NOTIFICATION_ITERATOR_STATUS_UNSUPPORTED;
  50 }
  51
  52 static
  53 void ctf_fs_iterator_destroy_data(struct ctf_fs_iterator *ctf_it)
  54 {
  55         g_free(ctf_it);
  56 }
  57
  58 static
  59 void ctf_fs_iterator_destroy(struct bt_notification_iterator *it)
  60 {
  61         void *data = bt_notification_iterator_get_private_data(it);
  62
  63         ctf_fs_iterator_destroy_data(data);
  64 }
  65
  66 static
  67 enum bt_component_status ctf_fs_iterator_init(struct bt_component *source,
  68                 struct bt_notification_iterator *it)
  69 {
  70         enum bt_component_status ret = BT_COMPONENT_STATUS_OK;
  71         struct ctf_fs_iterator *ctf_it;
  72
  73         assert(source && it);
  74         ctf_it = g_new0(struct ctf_fs_iterator, 1);
  75         if (!ctf_it) {
  76                 ret = BT_COMPONENT_STATUS_NOMEM;
  77                 goto end;
  78         }
  79
  80         ret = bt_notification_iterator_set_get_cb(it, ctf_fs_iterator_get);
  81         if (ret) {
  82                 goto error;
  83         }
  84
  85         ret = bt_notification_iterator_set_next_cb(it, ctf_fs_iterator_next);
  86         if (ret) {
  87                 goto error;
  88         }
  89
  90         ret = bt_notification_iterator_set_destroy_cb(it,
  91                         ctf_fs_iterator_destroy);
  92         if (ret) {
  93                 goto error;
  94         }
  95
  96         ret = bt_notification_iterator_set_private_data(it, ctf_it);
  97         if (ret) {
  98                 goto error;
  99         }
 100 end:
 101         return ret;
 102 error:
 103         (void) bt_notification_iterator_set_private_data(it, NULL);
 104         ctf_fs_iterator_destroy_data(ctf_it);
 105         return ret;
 106 }
 107
 108 static
 109 void ctf_fs_destroy_data(struct ctf_fs_component *component)
 110 {
 111         if (component->trace_path) {
 112                 g_string_free(component->trace_path, TRUE);
 113         }
 114
 115 //      ctf_fs_metadata_fini(&component->metadata);
 116 //      ctf_fs_data_stream_fini(&component->data_stream);
 117         g_free(component);
 118 }
 119
 120 static
 121 void ctf_fs_destroy(struct bt_component *component)
 122 {
 123         void *data = bt_component_get_private_data(component);
 124
 125         ctf_fs_destroy_data(data);
 126 }
 127
 128 static
 129 struct ctf_fs_component *ctf_fs_create(struct bt_value *params)
 130 {
 131         struct ctf_fs_component *ctf_fs;
 132         struct bt_value *value;
 133         const char *path;
 134         enum bt_value_status ret;
 135
 136         ctf_fs = g_new0(struct ctf_fs_component, 1);
 137         if (!ctf_fs) {
 138                 goto end;
 139         }
 140
 141         /* FIXME: should probably look for a source URI */
 142         value = bt_value_map_get(params, "path");
 143         if (!value || bt_value_is_null(value) || !bt_value_is_string(value)) {
 144                 goto error;
 145         }
 146
 147         ret = bt_value_string_get(value, &path);
 148         if (ret != BT_VALUE_STATUS_OK) {
 149                 goto error;
 150         }
 151
 152         ctf_fs->trace_path = g_string_new(path);
 153         if (!ctf_fs->trace_path) {
 154                 goto error;
 155         }
 156
 157         ctf_fs->error_fp = stderr;
 158         ctf_fs->page_size = (size_t) getpagesize();
 159
 160 end:
 161         return ctf_fs;
 162 error:
 163         ctf_fs_destroy_data(ctf_fs);
 164         return ctf_fs;
 165 }
 166
 167 BT_HIDDEN
 168 enum bt_component_status ctf_fs_init(struct bt_component *source,
 169                 struct bt_value *params)
 170 {
 171         struct ctf_fs_component *ctf_fs;
 172         enum bt_component_status ret = BT_COMPONENT_STATUS_OK;
 173
 174         assert(source);
 175         ctf_fs_debug = g_strcmp0(getenv("CTF_FS_DEBUG"), "1") == 0;
 176         ctf_fs = ctf_fs_create(params);
 177         if (!ctf_fs) {
 178                 ret = BT_COMPONENT_STATUS_NOMEM;
 179                 goto end;
 180         }
 181
 182         ret = bt_component_set_destroy_cb(source, ctf_fs_destroy);
 183         if (ret != BT_COMPONENT_STATUS_OK) {
 184                 goto error;
 185         }
 186
 187         ret = bt_component_set_private_data(source, ctf_fs);
 188         if (ret != BT_COMPONENT_STATUS_OK) {
 189                 goto error;
 190         }
 191
 192         ret = bt_component_source_set_iterator_init_cb(source,
 193                         ctf_fs_iterator_init);
 194         if (ret != BT_COMPONENT_STATUS_OK) {
 195                 goto error;
 196         }
 197 end:
 198         return ret;
 199 error:
 200         (void) bt_component_set_private_data(source, NULL);
 201         ctf_fs_destroy_data(ctf_fs);
 202         return ret;
 203 }