1 // Copyright 2022 Google LLC 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 #include "config.h" 15 16 #include "bifurcation.hpp" 17 18 #include <fmt/format.h> 19 20 #include <charconv> 21 #include <filesystem> 22 #include <fstream> 23 #include <nlohmann/json.hpp> 24 #include <optional> 25 #include <string_view> 26 #include <vector> 27 28 namespace google 29 { 30 namespace ipmi 31 { 32 33 BifurcationStatic::BifurcationStatic() : 34 BifurcationStatic(STATIC_BIFURCATION_CONFIG) 35 { 36 } 37 38 BifurcationStatic::BifurcationStatic(std::string_view bifurcationFile) : 39 bifurcationFile(bifurcationFile) 40 { 41 } 42 43 std::optional<std::vector<uint8_t>> 44 BifurcationStatic::getBifurcation(uint8_t index) noexcept 45 { 46 // Example valid data: 47 // { 48 // "1": [8,8], 49 // "2": [4, 4, 12] 50 // } 51 std::ifstream jsonFile(bifurcationFile.c_str()); 52 if (!jsonFile.is_open()) 53 { 54 fmt::print(stderr, "Unable to open file {} for bifurcation.\n", 55 bifurcationFile.data()); 56 return std::nullopt; 57 } 58 59 nlohmann::json jsonData; 60 try 61 { 62 jsonData = nlohmann::json::parse(jsonFile, nullptr, false); 63 } 64 catch (const nlohmann::json::parse_error& ex) 65 { 66 fmt::print( 67 stderr, 68 "Failed to parse the static config. Parse error at byte {}\n", 69 ex.byte); 70 return std::nullopt; 71 } 72 73 std::vector<uint8_t> vec; 74 try 75 { 76 std::string key = std::to_string(index); 77 auto value = jsonData[key]; 78 value.get_to(vec); 79 } 80 catch (std::exception const& e) 81 { 82 fmt::print(stderr, 83 "Failed to convert bifurcation value to vec[uin8_t]\n"); 84 return std::nullopt; 85 } 86 87 return vec; 88 } 89 90 } // namespace ipmi 91 } // namespace google 92