| 1 | /* |
| 2 | * Copyright (c) 2015 EfficiOS Inc. and Linux Foundation |
| 3 | * Copyright (c) 2015 Philippe Proulx <pproulx@efficios.com> |
| 4 | * |
| 5 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 6 | * of this software and associated documentation files (the "Software"), to deal |
| 7 | * in the Software without restriction, including without limitation the rights |
| 8 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 9 | * copies of the Software, and to permit persons to whom the Software is |
| 10 | * furnished to do so, subject to the following conditions: |
| 11 | * |
| 12 | * The above copyright notice and this permission notice shall be included in |
| 13 | * all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 18 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 21 | * SOFTWARE. |
| 22 | */ |
| 23 | |
| 24 | #define BT_LOG_TAG "LIB/ATTRS" |
| 25 | #include "lib/logging.h" |
| 26 | |
| 27 | #include "common/macros.h" |
| 28 | #include <babeltrace2/value.h> |
| 29 | #include "lib/assert-pre.h" |
| 30 | #include "lib/object.h" |
| 31 | #include <babeltrace2/value-const.h> |
| 32 | #include "lib/value.h" |
| 33 | #include "attributes.h" |
| 34 | #include <inttypes.h> |
| 35 | #include "compat/string.h" |
| 36 | #include "common/assert.h" |
| 37 | |
| 38 | #define BT_ATTR_NAME_INDEX 0 |
| 39 | #define BT_ATTR_VALUE_INDEX 1 |
| 40 | |
| 41 | BT_HIDDEN |
| 42 | struct bt_value *bt_attributes_create(void) |
| 43 | { |
| 44 | struct bt_value *attr_obj; |
| 45 | |
| 46 | /* |
| 47 | * Attributes: array value object of array value objects, each one |
| 48 | * containing two entries: a string value object (attributes |
| 49 | * field name), and a value object (attributes field value). |
| 50 | * |
| 51 | * Example (JSON representation): |
| 52 | * |
| 53 | * [ |
| 54 | * ["hostname", "eeppdesk"], |
| 55 | * ["sysname", "Linux"], |
| 56 | * ["tracer_major", 2], |
| 57 | * ["tracer_minor", 5] |
| 58 | * ] |
| 59 | */ |
| 60 | BT_LOGD_STR("Creating attributes object."); |
| 61 | attr_obj = bt_value_array_create(); |
| 62 | if (!attr_obj) { |
| 63 | BT_LIB_LOGE_APPEND_CAUSE("Failed to create array value."); |
| 64 | } else { |
| 65 | BT_LOGD("Created attributes object: addr=%p", |
| 66 | attr_obj); |
| 67 | } |
| 68 | |
| 69 | return attr_obj; |
| 70 | } |
| 71 | |
| 72 | BT_HIDDEN |
| 73 | void bt_attributes_destroy(struct bt_value *attr_obj) |
| 74 | { |
| 75 | BT_LOGD("Destroying attributes object: addr=%p", attr_obj); |
| 76 | BT_OBJECT_PUT_REF_AND_RESET(attr_obj); |
| 77 | } |
| 78 | |
| 79 | BT_HIDDEN |
| 80 | uint64_t bt_attributes_get_count(const struct bt_value *attr_obj) |
| 81 | { |
| 82 | return bt_value_array_get_length(attr_obj); |
| 83 | } |
| 84 | |
| 85 | BT_HIDDEN |
| 86 | const char *bt_attributes_get_field_name(const struct bt_value *attr_obj, |
| 87 | uint64_t index) |
| 88 | { |
| 89 | const struct bt_value *attr_field_obj = NULL; |
| 90 | const struct bt_value *attr_field_name_obj = NULL; |
| 91 | |
| 92 | BT_ASSERT_DBG(attr_obj); |
| 93 | BT_ASSERT_DBG(index < bt_value_array_get_length(attr_obj)); |
| 94 | attr_field_obj = bt_value_array_borrow_element_by_index_const( |
| 95 | attr_obj, index); |
| 96 | |
| 97 | attr_field_name_obj = |
| 98 | bt_value_array_borrow_element_by_index_const(attr_field_obj, |
| 99 | BT_ATTR_NAME_INDEX); |
| 100 | |
| 101 | return bt_value_string_get(attr_field_name_obj); |
| 102 | } |
| 103 | |
| 104 | BT_HIDDEN |
| 105 | struct bt_value *bt_attributes_borrow_field_value( |
| 106 | struct bt_value *attr_obj, uint64_t index) |
| 107 | { |
| 108 | struct bt_value *attr_field_obj = NULL; |
| 109 | |
| 110 | BT_ASSERT_DBG(attr_obj); |
| 111 | BT_ASSERT_DBG(index < bt_value_array_get_length(attr_obj)); |
| 112 | |
| 113 | attr_field_obj = |
| 114 | bt_value_array_borrow_element_by_index(attr_obj, index); |
| 115 | |
| 116 | return bt_value_array_borrow_element_by_index( attr_field_obj, |
| 117 | BT_ATTR_VALUE_INDEX); |
| 118 | } |
| 119 | |
| 120 | static |
| 121 | struct bt_value *bt_attributes_borrow_field_by_name( |
| 122 | struct bt_value *attr_obj, const char *name) |
| 123 | { |
| 124 | uint64_t i, attr_size; |
| 125 | struct bt_value *value_obj = NULL; |
| 126 | struct bt_value *attr_field_name_obj = NULL; |
| 127 | |
| 128 | attr_size = bt_value_array_get_length(attr_obj); |
| 129 | for (i = 0; i < attr_size; ++i) { |
| 130 | const char *field_name; |
| 131 | |
| 132 | value_obj = bt_value_array_borrow_element_by_index( |
| 133 | attr_obj, i); |
| 134 | |
| 135 | attr_field_name_obj = |
| 136 | bt_value_array_borrow_element_by_index( |
| 137 | value_obj, BT_ATTR_NAME_INDEX); |
| 138 | |
| 139 | field_name = bt_value_string_get(attr_field_name_obj); |
| 140 | |
| 141 | if (strcmp(field_name, name) == 0) { |
| 142 | break; |
| 143 | } |
| 144 | |
| 145 | value_obj = NULL; |
| 146 | } |
| 147 | |
| 148 | return value_obj; |
| 149 | } |
| 150 | |
| 151 | BT_HIDDEN |
| 152 | int bt_attributes_set_field_value(struct bt_value *attr_obj, |
| 153 | const char *name, struct bt_value *value_obj) |
| 154 | { |
| 155 | int ret = 0; |
| 156 | struct bt_value *attr_field_obj = NULL; |
| 157 | |
| 158 | BT_ASSERT(attr_obj); |
| 159 | BT_ASSERT(name); |
| 160 | BT_ASSERT(value_obj); |
| 161 | attr_field_obj = bt_attributes_borrow_field_by_name(attr_obj, name); |
| 162 | if (attr_field_obj) { |
| 163 | ret = bt_value_array_set_element_by_index( |
| 164 | attr_field_obj, BT_ATTR_VALUE_INDEX, |
| 165 | value_obj); |
| 166 | attr_field_obj = NULL; |
| 167 | goto end; |
| 168 | } |
| 169 | |
| 170 | attr_field_obj = bt_value_array_create(); |
| 171 | if (!attr_field_obj) { |
| 172 | BT_LIB_LOGE_APPEND_CAUSE("Failed to create empty array value."); |
| 173 | ret = -1; |
| 174 | goto end; |
| 175 | } |
| 176 | |
| 177 | ret = bt_value_array_append_string_element(attr_field_obj, |
| 178 | name); |
| 179 | ret |= bt_value_array_append_element(attr_field_obj, |
| 180 | value_obj); |
| 181 | if (ret) { |
| 182 | BT_LIB_LOGE_APPEND_CAUSE( |
| 183 | "Cannot append elements to array value: %!+v", |
| 184 | attr_field_obj); |
| 185 | goto end; |
| 186 | } |
| 187 | |
| 188 | ret = bt_value_array_append_element(attr_obj, |
| 189 | attr_field_obj); |
| 190 | if (ret) { |
| 191 | BT_LIB_LOGE_APPEND_CAUSE( |
| 192 | "Cannot append element to array value: " |
| 193 | "%![array-value-]+v, %![element-value-]+v", |
| 194 | attr_obj, attr_field_obj); |
| 195 | } |
| 196 | |
| 197 | end: |
| 198 | bt_object_put_ref(attr_field_obj); |
| 199 | return ret; |
| 200 | } |
| 201 | |
| 202 | BT_HIDDEN |
| 203 | struct bt_value *bt_attributes_borrow_field_value_by_name( |
| 204 | struct bt_value *attr_obj, const char *name) |
| 205 | { |
| 206 | struct bt_value *value_obj = NULL; |
| 207 | struct bt_value *attr_field_obj = NULL; |
| 208 | |
| 209 | BT_ASSERT_DBG(attr_obj); |
| 210 | BT_ASSERT_DBG(name); |
| 211 | attr_field_obj = bt_attributes_borrow_field_by_name(attr_obj, name); |
| 212 | if (!attr_field_obj) { |
| 213 | BT_LOGD("Cannot find attributes object's field by name: " |
| 214 | "value-addr=%p, name=\"%s\"", attr_obj, name); |
| 215 | goto end; |
| 216 | } |
| 217 | |
| 218 | value_obj = bt_value_array_borrow_element_by_index( |
| 219 | attr_field_obj, BT_ATTR_VALUE_INDEX); |
| 220 | |
| 221 | end: |
| 222 | return value_obj; |
| 223 | } |
| 224 | |
| 225 | BT_HIDDEN |
| 226 | int bt_attributes_freeze(const struct bt_value *attr_obj) |
| 227 | { |
| 228 | uint64_t i, count; |
| 229 | int ret = 0; |
| 230 | |
| 231 | BT_ASSERT(attr_obj); |
| 232 | BT_LOGD("Freezing attributes object: value-addr=%p", attr_obj); |
| 233 | |
| 234 | count = bt_value_array_get_length(attr_obj); |
| 235 | |
| 236 | /* |
| 237 | * We do not freeze the array value object itself here, since |
| 238 | * internal stuff could need to modify/add attributes. Each |
| 239 | * attribute is frozen one by one. |
| 240 | */ |
| 241 | for (i = 0; i < count; ++i) { |
| 242 | struct bt_value *obj = NULL; |
| 243 | |
| 244 | obj = bt_attributes_borrow_field_value( |
| 245 | (void *) attr_obj, i); |
| 246 | if (!obj) { |
| 247 | BT_LIB_LOGE_APPEND_CAUSE( |
| 248 | "Cannot get attributes object's field value by index: " |
| 249 | "%![value-]+v, index=%" PRIu64, |
| 250 | attr_obj, i); |
| 251 | ret = -1; |
| 252 | goto end; |
| 253 | } |
| 254 | |
| 255 | bt_value_freeze(obj); |
| 256 | } |
| 257 | |
| 258 | end: |
| 259 | return ret; |
| 260 | } |