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Diffstat (limited to 'low-can-binding/utils/config-parser.cpp')
| -rw-r--r-- | low-can-binding/utils/config-parser.cpp | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/low-can-binding/utils/config-parser.cpp b/low-can-binding/utils/config-parser.cpp new file mode 100644 index 0000000..e73b0f9 --- /dev/null +++ b/low-can-binding/utils/config-parser.cpp @@ -0,0 +1,84 @@ +/* + * Copyright (C) 2015, 2016 ,2017 "IoT.bzh" + * Author "Romain Forlot" <romain.forlot@iot.bzh> + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +namespace utils +{ + config_parser_t::config_parser_t(int conf_file) + : conf_file_{conf_file}, devices_name{} + {} + + /// @brief read the conf_file_ and will parse json objects + /// in it searching for canbus objects devices name. + /// + /// @return Vector of can bus device name string. + void can_bus_t::read_conf() + { + FILE *fd = fdopen(conf_file_, "r"); + if (fd) + { + std::fseek(fd, 0, SEEK_END); + config_content_.resize(std::ftell(fd)); + std::rewind(fd); + std::fread(&config_content_[0], 1, config_content_.size(), fd); + std::fclose(fd); + + DEBUG(binder_interface, "Configuration file content : %s", config_content_.c_str()); + } + ERROR(binder_interface, "Problem at reading the conf file"); + } + + void parse_devices_name() + { + json_object *jo, *canbus; + const char* taxi; + + jo = json_tokener_parse(config_content_.c_str()); + + if (jo == NULL || !json_object_object_get_ex(jo, "canbus", &canbus)) + { + ERROR(binder_interface, "Can't find canbus node in the configuration file. Please review it."); + devices_name_.clear(); + } + else if (json_object_get_type(canbus) != json_type_array) + { + taxi = json_object_get_string(canbus); + DEBUG(binder_interface, "Can bus found: %s", taxi); + devices_name_.push_back(std::string(taxi)); + } + else + { + int n, i; + n = json_object_array_length(canbus); + for (i = 0 ; i < n ; i++) + devices_name_.push_back(json_object_get_string(json_object_array_get_idx(canbus, i))); + } + } + + /// @brief Public method to access devices_name_ vector. If vector size equal 0 + /// then it will parses the configuration file content to fill it. It could be empty even + /// after parsing if content file just don't have a correct "canbus" directive so you + /// have to test the returned value. + /// + /// @return A const vector with string of linux CAN devices. + const std::vector<std::string>& get_devices_name() + { + if(devices_name_.empty()) + parse_devices_name(); + + return devices_name_; + } +}
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