Shawn McCarney | 0e8c68a | 2020-03-27 01:44:48 -0500 | [diff] [blame] | 1 | /** |
| 2 | * Copyright © 2020 IBM Corporation |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | #pragma once |
| 17 | |
| 18 | #include "action.hpp" |
| 19 | #include "chassis.hpp" |
Bob King | f617f89 | 2020-03-30 19:03:35 +0800 | [diff] [blame^] | 20 | #include "i2c_write_bit_action.hpp" |
Shawn McCarney | 0e8c68a | 2020-03-27 01:44:48 -0500 | [diff] [blame] | 21 | #include "pmbus_write_vout_command_action.hpp" |
| 22 | #include "rule.hpp" |
| 23 | |
| 24 | #include <nlohmann/json.hpp> |
| 25 | |
| 26 | #include <cstdint> |
| 27 | #include <filesystem> |
| 28 | #include <memory> |
| 29 | #include <stdexcept> |
| 30 | #include <string> |
| 31 | #include <tuple> |
| 32 | #include <vector> |
| 33 | |
| 34 | namespace phosphor::power::regulators::config_file_parser |
| 35 | { |
| 36 | |
| 37 | /** |
| 38 | * Parses the specified JSON configuration file. |
| 39 | * |
| 40 | * Returns the corresponding C++ Rule and Chassis objects. |
| 41 | * |
| 42 | * Throws a ConfigFileParserError if an error occurs. |
| 43 | * |
| 44 | * @param pathName configuration file path name |
| 45 | * @return tuple containing vectors of Rule and Chassis objects |
| 46 | */ |
| 47 | std::tuple<std::vector<std::unique_ptr<Rule>>, |
| 48 | std::vector<std::unique_ptr<Chassis>>> |
| 49 | parse(const std::filesystem::path& pathName); |
| 50 | |
| 51 | /* |
| 52 | * Internal implementation details for parse() |
| 53 | */ |
| 54 | namespace internal |
| 55 | { |
| 56 | |
| 57 | /** |
| 58 | * Returns the specified property of the specified JSON element. |
| 59 | * |
| 60 | * Throws an invalid_argument exception if the property does not exist. |
| 61 | * |
| 62 | * @param element JSON element |
| 63 | * @param property property name |
| 64 | */ |
| 65 | inline const nlohmann::json& getRequiredProperty(const nlohmann::json& element, |
| 66 | const std::string& property) |
| 67 | { |
| 68 | auto it = element.find(property); |
| 69 | if (it == element.end()) |
| 70 | { |
| 71 | throw std::invalid_argument{"Required property missing: " + property}; |
| 72 | } |
| 73 | return *it; |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Parses a JSON element containing an action. |
| 78 | * |
| 79 | * Returns the corresponding C++ Action object. |
| 80 | * |
| 81 | * Throws an exception if parsing fails. |
| 82 | * |
| 83 | * @param element JSON element |
| 84 | * @return Action object |
| 85 | */ |
| 86 | std::unique_ptr<Action> parseAction(const nlohmann::json& element); |
| 87 | |
| 88 | /** |
| 89 | * Parses a JSON element containing an array of actions. |
| 90 | * |
| 91 | * Returns the corresponding C++ Action objects. |
| 92 | * |
| 93 | * Throws an exception if parsing fails. |
| 94 | * |
| 95 | * @param element JSON element |
| 96 | * @return vector of Action objects |
| 97 | */ |
| 98 | std::vector<std::unique_ptr<Action>> |
| 99 | parseActionArray(const nlohmann::json& element); |
| 100 | |
| 101 | /** |
Bob King | f617f89 | 2020-03-30 19:03:35 +0800 | [diff] [blame^] | 102 | * Parses a JSON element containing a bit position (from 0-7). |
| 103 | * |
| 104 | * Returns the corresponding C++ uint8_t value. |
| 105 | * |
| 106 | * Throws an exception if parsing fails. |
| 107 | * |
| 108 | * @param element JSON element |
| 109 | * @return uint8_t value |
| 110 | */ |
| 111 | inline uint8_t parseBitPosition(const nlohmann::json& element) |
| 112 | { |
| 113 | // Verify element contains an integer |
| 114 | if (!element.is_number_integer()) |
| 115 | { |
| 116 | throw std::invalid_argument{"Element is not an integer"}; |
| 117 | } |
| 118 | int value = element; |
| 119 | if ((value < 0) || (value > 7)) |
| 120 | { |
| 121 | throw std::invalid_argument{"Element is not a bit position"}; |
| 122 | } |
| 123 | return static_cast<uint8_t>(value); |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * Parses a JSON element containing a bit value (0 or 1). |
| 128 | * |
| 129 | * Returns the corresponding C++ uint8_t value. |
| 130 | * |
| 131 | * Throws an exception if parsing fails. |
| 132 | * |
| 133 | * @param element JSON element |
| 134 | * @return uint8_t value |
| 135 | */ |
| 136 | inline uint8_t parseBitValue(const nlohmann::json& element) |
| 137 | { |
| 138 | // Verify element contains an integer |
| 139 | if (!element.is_number_integer()) |
| 140 | { |
| 141 | throw std::invalid_argument{"Element is not an integer"}; |
| 142 | } |
| 143 | int value = element; |
| 144 | if ((value < 0) || (value > 1)) |
| 145 | { |
| 146 | throw std::invalid_argument{"Element is not a bit value"}; |
| 147 | } |
| 148 | return static_cast<uint8_t>(value); |
| 149 | } |
| 150 | |
| 151 | /** |
Shawn McCarney | 0e8c68a | 2020-03-27 01:44:48 -0500 | [diff] [blame] | 152 | * Parses a JSON element containing a boolean. |
| 153 | * |
| 154 | * Returns the corresponding C++ boolean value. |
| 155 | * |
| 156 | * Throws an exception if parsing fails. |
| 157 | * |
| 158 | * @param element JSON element |
| 159 | * @return boolean value |
| 160 | */ |
| 161 | inline bool parseBoolean(const nlohmann::json& element) |
| 162 | { |
| 163 | // Verify element contains a boolean |
| 164 | if (!element.is_boolean()) |
| 165 | { |
| 166 | throw std::invalid_argument{"Element is not a boolean"}; |
| 167 | } |
| 168 | return element.get<bool>(); |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Parses a JSON element containing an array of chassis. |
| 173 | * |
| 174 | * Returns the corresponding C++ Chassis objects. |
| 175 | * |
| 176 | * Throws an exception if parsing fails. |
| 177 | * |
| 178 | * @param element JSON element |
| 179 | * @return vector of Chassis objects |
| 180 | */ |
| 181 | std::vector<std::unique_ptr<Chassis>> |
| 182 | parseChassisArray(const nlohmann::json& element); |
| 183 | |
| 184 | /** |
| 185 | * Parses a JSON element containing a double (floating point number). |
| 186 | * |
| 187 | * Returns the corresponding C++ double value. |
| 188 | * |
| 189 | * Throws an exception if parsing fails. |
| 190 | * |
| 191 | * @param element JSON element |
| 192 | * @return double value |
| 193 | */ |
| 194 | inline double parseDouble(const nlohmann::json& element) |
| 195 | { |
| 196 | // Verify element contains a number (integer or floating point) |
| 197 | if (!element.is_number()) |
| 198 | { |
| 199 | throw std::invalid_argument{"Element is not a number"}; |
| 200 | } |
| 201 | return element.get<double>(); |
| 202 | } |
| 203 | |
| 204 | /** |
Bob King | f617f89 | 2020-03-30 19:03:35 +0800 | [diff] [blame^] | 205 | * Parses a JSON element containing an i2c_write_bit action. |
| 206 | * |
| 207 | * Returns the corresponding C++ I2CWriteBitAction object. |
| 208 | * |
| 209 | * Throws an exception if parsing fails. |
| 210 | * |
| 211 | * @param element JSON element |
| 212 | * @return I2CWriteBitAction object |
| 213 | */ |
| 214 | std::unique_ptr<I2CWriteBitAction> |
| 215 | parseI2CWriteBit(const nlohmann::json& element); |
| 216 | |
| 217 | /** |
Shawn McCarney | 0e8c68a | 2020-03-27 01:44:48 -0500 | [diff] [blame] | 218 | * Parses a JSON element containing an 8-bit signed integer. |
| 219 | * |
| 220 | * Returns the corresponding C++ int8_t value. |
| 221 | * |
| 222 | * Throws an exception if parsing fails. |
| 223 | * |
| 224 | * @param element JSON element |
| 225 | * @return int8_t value |
| 226 | */ |
| 227 | inline int8_t parseInt8(const nlohmann::json& element) |
| 228 | { |
| 229 | // Verify element contains an integer |
| 230 | if (!element.is_number_integer()) |
| 231 | { |
| 232 | throw std::invalid_argument{"Element is not an integer"}; |
| 233 | } |
| 234 | int value = element; |
| 235 | if ((value < INT8_MIN) || (value > INT8_MAX)) |
| 236 | { |
| 237 | throw std::invalid_argument{"Element is not an 8-bit signed integer"}; |
| 238 | } |
| 239 | return static_cast<int8_t>(value); |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * Parses a JSON element containing a pmbus_write_vout_command action. |
| 244 | * |
| 245 | * Returns the corresponding C++ PMBusWriteVoutCommandAction object. |
| 246 | * |
| 247 | * Throws an exception if parsing fails. |
| 248 | * |
| 249 | * @param element JSON element |
| 250 | * @return PMBusWriteVoutCommandAction object |
| 251 | */ |
| 252 | std::unique_ptr<PMBusWriteVoutCommandAction> |
| 253 | parsePMBusWriteVoutCommand(const nlohmann::json& element); |
| 254 | |
| 255 | /** |
| 256 | * Parses the JSON root element of the entire configuration file. |
| 257 | * |
| 258 | * Returns the corresponding C++ Rule and Chassis objects. |
| 259 | * |
| 260 | * Throws an exception if parsing fails. |
| 261 | * |
| 262 | * @param element JSON element |
| 263 | * @return tuple containing vectors of Rule and Chassis objects |
| 264 | */ |
| 265 | std::tuple<std::vector<std::unique_ptr<Rule>>, |
| 266 | std::vector<std::unique_ptr<Chassis>>> |
| 267 | parseRoot(const nlohmann::json& element); |
| 268 | |
| 269 | /** |
| 270 | * Parses a JSON element containing a rule. |
| 271 | * |
| 272 | * Returns the corresponding C++ Rule object. |
| 273 | * |
| 274 | * Throws an exception if parsing fails. |
| 275 | * |
| 276 | * @param element JSON element |
| 277 | * @return Rule object |
| 278 | */ |
| 279 | std::unique_ptr<Rule> parseRule(const nlohmann::json& element); |
| 280 | |
| 281 | /** |
| 282 | * Parses a JSON element containing an array of rules. |
| 283 | * |
| 284 | * Returns the corresponding C++ Rule objects. |
| 285 | * |
| 286 | * Throws an exception if parsing fails. |
| 287 | * |
| 288 | * @param element JSON element |
| 289 | * @return vector of Rule objects |
| 290 | */ |
| 291 | std::vector<std::unique_ptr<Rule>> |
| 292 | parseRuleArray(const nlohmann::json& element); |
| 293 | |
| 294 | /** |
| 295 | * Parses a JSON element containing a string. |
| 296 | * |
| 297 | * Returns the corresponding C++ string. |
| 298 | * |
| 299 | * Throws an exception if parsing fails. |
| 300 | * |
| 301 | * @param element JSON element |
| 302 | * @param isEmptyValid indicates whether an empty string value is valid |
| 303 | * @return string value |
| 304 | */ |
| 305 | inline std::string parseString(const nlohmann::json& element, |
| 306 | bool isEmptyValid = false) |
| 307 | { |
| 308 | if (!element.is_string()) |
| 309 | { |
| 310 | throw std::invalid_argument{"Element is not a string"}; |
| 311 | } |
| 312 | std::string value = element; |
| 313 | if (value.empty() && !isEmptyValid) |
| 314 | { |
| 315 | throw std::invalid_argument{"Element contains an empty string"}; |
| 316 | } |
| 317 | return value; |
| 318 | } |
| 319 | |
| 320 | /** |
Bob King | f617f89 | 2020-03-30 19:03:35 +0800 | [diff] [blame^] | 321 | * Parses a JSON element containing a hexadecimal string. |
| 322 | * |
| 323 | * Returns the corresponding C++ uint8_t value. |
| 324 | * |
| 325 | * Throws an exception if parsing fails. |
| 326 | * |
| 327 | * @param element JSON element |
| 328 | * @return uint8_t value |
| 329 | */ |
| 330 | inline uint8_t parseStringToUint8(const nlohmann::json& element) |
| 331 | { |
| 332 | std::string value = parseString(element); |
| 333 | |
| 334 | bool isHex = (value.compare(0, 2, "0x") == 0) && (value.size() > 2) && |
| 335 | (value.size() < 5) && |
| 336 | (value.find_first_not_of("0123456789abcdefABCDEF", 2) == |
| 337 | std::string::npos); |
| 338 | if (!isHex) |
| 339 | { |
| 340 | throw std::invalid_argument{"Element is not hexadecimal string"}; |
| 341 | } |
| 342 | return static_cast<uint8_t>(std::stoul(value, 0, 0)); |
| 343 | } |
| 344 | |
| 345 | /** |
| 346 | * Parses a JSON element containing an 8-bit unsigned integer. |
| 347 | * |
| 348 | * Returns the corresponding C++ uint8_t value. |
| 349 | * |
| 350 | * Throws an exception if parsing fails. |
| 351 | * |
| 352 | * @param element JSON element |
| 353 | * @return uint8_t value |
| 354 | */ |
| 355 | inline uint8_t parseUint8(const nlohmann::json& element) |
| 356 | { |
| 357 | // Verify element contains an integer |
| 358 | if (!element.is_number_integer()) |
| 359 | { |
| 360 | throw std::invalid_argument{"Element is not an integer"}; |
| 361 | } |
| 362 | int value = element; |
| 363 | if ((value < 0) || (value > UINT8_MAX)) |
| 364 | { |
| 365 | throw std::invalid_argument{"Element is not an 8-bit unsigned integer"}; |
| 366 | } |
| 367 | return static_cast<uint8_t>(value); |
| 368 | } |
| 369 | |
| 370 | /** |
Shawn McCarney | 0e8c68a | 2020-03-27 01:44:48 -0500 | [diff] [blame] | 371 | * Verifies that the specified JSON element is a JSON array. |
| 372 | * |
| 373 | * Throws an invalid_argument exception if the element is not an array. |
| 374 | * |
| 375 | * @param element JSON element |
| 376 | */ |
| 377 | inline void verifyIsArray(const nlohmann::json& element) |
| 378 | { |
| 379 | if (!element.is_array()) |
| 380 | { |
| 381 | throw std::invalid_argument{"Element is not an array"}; |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | /** |
| 386 | * Verifies that the specified JSON element is a JSON object. |
| 387 | * |
| 388 | * Throws an invalid_argument exception if the element is not an object. |
| 389 | * |
| 390 | * @param element JSON element |
| 391 | */ |
| 392 | inline void verifyIsObject(const nlohmann::json& element) |
| 393 | { |
| 394 | if (!element.is_object()) |
| 395 | { |
| 396 | throw std::invalid_argument{"Element is not an object"}; |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | /** |
| 401 | * Verifies that the specified JSON element contains the expected number of |
| 402 | * properties. |
| 403 | * |
| 404 | * Throws an invalid_argument exception if the element contains a different |
| 405 | * number of properties. This indicates the element contains an invalid |
| 406 | * property. |
| 407 | * |
| 408 | * @param element JSON element |
| 409 | * @param expectedCount expected number of properties in element |
| 410 | */ |
| 411 | inline void verifyPropertyCount(const nlohmann::json& element, |
| 412 | unsigned int expectedCount) |
| 413 | { |
| 414 | if (element.size() != expectedCount) |
| 415 | { |
| 416 | throw std::invalid_argument{"Element contains an invalid property"}; |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | } // namespace internal |
| 421 | |
| 422 | } // namespace phosphor::power::regulators::config_file_parser |