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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* 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.
*/
#include <core/global_configuration.h>
#include <glog/logging.h>
#include <hicn/transport/core/connector.h>
#include <libconfig.h++>
#include <map>
namespace transport {
namespace core {
GlobalConfiguration::GlobalConfiguration() {}
bool GlobalConfiguration::parseTransportConfig(const std::string& path) {
using namespace libconfig;
Config cfg;
try {
cfg.readFile(path.c_str());
} catch (const FileIOException& fioex) {
LOG(ERROR) << "I/O error while reading file.";
return false;
} catch (const ParseException& pex) {
LOG(ERROR) << "Parse error at " << pex.getFile() << ":" << pex.getLine()
<< " - " << pex.getError();
return false;
}
Setting& root = cfg.getRoot();
/**
* Iterate over sections. Best thing to do here would be to have other
* components of the program registering a callback here, to parse their
* section of the configuration file.
*/
for (auto section = root.begin(); section != root.end(); section++) {
std::string name = section->getName();
std::error_code ec;
VLOG(2) << "Parsing Section: " << name;
auto it = configuration_parsers_.find(name);
if (it != configuration_parsers_.end() && !it->second.first) {
VLOG(2) << "Found valid configuration parser";
it->second.second(*section, ec);
it->second.first = true;
}
}
return true;
}
void GlobalConfiguration::parseConfiguration(const std::string& path) {
// Check if an environment variable with the configuration path exists. Conf
// variable comes first.
std::unique_lock<std::mutex> lck(cp_mtx_);
if (const char* env_c = std::getenv(GlobalConfiguration::conf_file)) {
parseTransportConfig(env_c);
} else if (!path.empty()) {
conf_file_path_ = path;
parseTransportConfig(conf_file_path_);
} else {
LOG(ERROR)
<< "Called parseConfiguration but no configuration file was provided.";
}
}
void GlobalConfiguration::registerConfigurationSetter(
const std::string& key, const SetCallback& set_callback) {
std::unique_lock<std::mutex> lck(cp_mtx_);
if (configuration_setters_.find(key) != configuration_setters_.end()) {
LOG(WARNING) << "Trying to register configuration setter " << key
<< " twice. Ignoring second "
"registration attempt.";
} else {
configuration_setters_.emplace(key, set_callback);
}
}
void GlobalConfiguration::registerConfigurationGetter(
const std::string& key, const GetCallback& get_callback) {
std::unique_lock<std::mutex> lck(cp_mtx_);
if (configuration_getters_.find(key) != configuration_getters_.end()) {
LOG(WARNING) << "Trying to register configuration setter " << key
<< " twice. Ignoring second "
"registration attempt.";
} else {
configuration_getters_.emplace(key, get_callback);
}
}
void GlobalConfiguration::registerConfigurationParser(
const std::string& key, const ParserCallback& parser) {
std::unique_lock<std::mutex> lck(cp_mtx_);
if (configuration_parsers_.find(key) != configuration_parsers_.end()) {
LOG(WARNING) << "Trying to register configuration setter " << key
<< " twice. Ignoring second "
"registration attempt.";
} else {
configuration_parsers_.emplace(key, std::make_pair(false, parser));
// Trigger a parsing of the configuration.
if (!conf_file_path_.empty()) {
parseTransportConfig(conf_file_path_);
}
}
}
void GlobalConfiguration::unregisterConfigurationParser(
const std::string& key) {
std::unique_lock<std::mutex> lck(cp_mtx_);
auto it = configuration_parsers_.find(key);
if (it != configuration_parsers_.end()) {
configuration_parsers_.erase(it);
}
}
void GlobalConfiguration::unregisterConfigurationSetter(
const std::string& key) {
std::unique_lock<std::mutex> lck(cp_mtx_);
auto it = configuration_setters_.find(key);
if (it != configuration_setters_.end()) {
configuration_setters_.erase(it);
}
}
void GlobalConfiguration::unregisterConfigurationGetter(
const std::string& key) {
std::unique_lock<std::mutex> lck(cp_mtx_);
auto it = configuration_getters_.find(key);
if (it != configuration_getters_.end()) {
configuration_getters_.erase(it);
}
}
void GlobalConfiguration::getConfiguration(
interface::global_config::ConfigurationObject& configuration_object,
std::error_code& ec) {
auto it = configuration_getters_.find(configuration_object.getKey());
if (it != configuration_getters_.end()) {
it->second(configuration_object, ec);
}
}
void GlobalConfiguration::setConfiguration(
const interface::global_config::ConfigurationObject& configuration_object,
std::error_code& ec) {
auto it = configuration_setters_.find(configuration_object.getKey());
if (it != configuration_setters_.end()) {
it->second(configuration_object, ec);
}
}
} // namespace core
} // namespace transport
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