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//
// Copyright (C) 2020 The Android Open Source Project
//
// 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 "host/commands/modem_simulator/nvram_config.h"
#include <android-base/logging.h>
#include <json/json.h>
#include <fstream>
#include <mutex>
#include "common/libs/utils/files.h"
#include "host/commands/modem_simulator/device_config.h"
namespace cuttlefish {
static constexpr char kInstances[] = "instances";
static constexpr char kNetworkSelectionMode[] = "network_selection_mode";
static constexpr char kOperatorNumeric[] = "operator_numeric";
static constexpr char kModemTechnoloy[] = "modem_technoloy";
static constexpr char kPreferredNetworkMode[] = "preferred_network_mode";
static constexpr char kEmergencyMode[] = "emergency_mode";
static constexpr int kDefaultNetworkSelectionMode = 0; // AUTOMATIC
static constexpr int kDefaultModemTechnoloy = 0x10; // LTE
static constexpr int kDefaultPreferredNetworkMode = 0x13; // LTE | WCDMA | GSM
static constexpr bool kDefaultEmergencyMode = false;
/**
* Creates the (initially empty) config object and populates it with values from
* the config file "modem_nvram.json" located in the cuttlefish instance path,
* or uses the default value if the config file not exists,
* Returns nullptr if there was an error loading from file
*/
NvramConfig* NvramConfig::BuildConfigImpl(size_t num_instances, int sim_type) {
auto nvram_config_path =
cuttlefish::modem::DeviceConfig::PerInstancePath("modem_nvram.json");
auto ret = new NvramConfig(num_instances, sim_type);
if (ret) {
if (!cuttlefish::FileExists(nvram_config_path) ||
!cuttlefish::FileHasContent(nvram_config_path.c_str())) {
ret->InitDefaultNvramConfig();
} else {
auto loaded = ret->LoadFromFile(nvram_config_path.c_str());
if (!loaded) {
/** Bug: (b/315167296)
* Fall back to default nvram config if LoadFromFile fails.
*/
ret->InitDefaultNvramConfig();
}
}
}
return ret;
}
std::unique_ptr<NvramConfig> NvramConfig::s_nvram_config;
void NvramConfig::InitNvramConfigService(size_t num_instances, int sim_type) {
static std::once_flag once_flag;
std::call_once(once_flag, [num_instances, sim_type]() {
NvramConfig::s_nvram_config.reset(BuildConfigImpl(num_instances, sim_type));
});
}
/* static */ const NvramConfig* NvramConfig::Get() {
return s_nvram_config.get();
}
void NvramConfig::SaveToFile() {
auto nvram_config = Get();
auto nvram_config_file = nvram_config->ConfigFileLocation();
nvram_config->SaveToFile(nvram_config_file);
}
NvramConfig::NvramConfig(size_t num_instances, int sim_type)
: total_instances_(num_instances),
sim_type_(sim_type),
dictionary_(new Json::Value()) {}
// Can't use '= default' on the header because the compiler complains of
// Json::Value being an incomplete type
NvramConfig::~NvramConfig() = default;
NvramConfig::NvramConfig(NvramConfig&&) = default;
NvramConfig& NvramConfig::operator=(NvramConfig&&) = default;
NvramConfig::InstanceSpecific NvramConfig::ForInstance(int num) const {
return InstanceSpecific(this, std::to_string(num));
}
std::string NvramConfig::ConfigFileLocation() const {
return cuttlefish::AbsolutePath(
cuttlefish::modem::DeviceConfig::PerInstancePath("modem_nvram.json"));
}
bool NvramConfig::LoadFromFile(const char* file) {
auto real_file_path = cuttlefish::AbsolutePath(file);
if (real_file_path.empty()) {
LOG(ERROR) << "Could not get real path for file " << file;
return false;
}
Json::CharReaderBuilder builder;
std::ifstream ifs = modem::DeviceConfig::open_ifstream_crossplat(real_file_path.c_str());
std::string errorMessage;
if (!Json::parseFromStream(builder, ifs, dictionary_.get(), &errorMessage)) {
LOG(ERROR) << "Could not read config file " << file << ": "
<< errorMessage;
return false;
}
return true;
}
bool NvramConfig::SaveToFile(const std::string& file) const {
std::ofstream ofs = modem::DeviceConfig::open_ofstream_crossplat(file.c_str());
if (!ofs.is_open()) {
LOG(ERROR) << "Unable to write to file " << file;
return false;
}
ofs << *dictionary_;
return !ofs.fail();
}
void NvramConfig::InitDefaultNvramConfig() {
for (size_t num = 0; num < total_instances_; num++) {
auto instance = ForInstance(num);
instance.set_modem_technoloy(kDefaultModemTechnoloy);
instance.set_network_selection_mode(kDefaultNetworkSelectionMode);
instance.set_preferred_network_mode(kDefaultPreferredNetworkMode);
instance.set_emergency_mode(kDefaultEmergencyMode);
}
}
const Json::Value* NvramConfig::InstanceSpecific::Dictionary() const {
return &(*config_->dictionary_)[kInstances][id_];
}
Json::Value* NvramConfig::InstanceSpecific::Dictionary() {
return &(*config_->dictionary_)[kInstances][id_];
}
int NvramConfig::InstanceSpecific::network_selection_mode() const {
return (*Dictionary())[kNetworkSelectionMode].asInt();
}
void NvramConfig::InstanceSpecific::set_network_selection_mode(int mode) {
(*Dictionary())[kNetworkSelectionMode] = mode;
}
std::string NvramConfig::InstanceSpecific::operator_numeric() const {
return (*Dictionary())[kOperatorNumeric].asString();
}
void NvramConfig::InstanceSpecific::set_operator_numeric(std::string& operator_numeric) {
(*Dictionary())[kOperatorNumeric] = operator_numeric;
}
int NvramConfig::InstanceSpecific::modem_technoloy() const {
return (*Dictionary())[kModemTechnoloy].asInt();
}
void NvramConfig::InstanceSpecific::set_modem_technoloy(int technoloy) {
(*Dictionary())[kModemTechnoloy] = technoloy;
}
int NvramConfig::InstanceSpecific::preferred_network_mode() const {
return (*Dictionary())[kPreferredNetworkMode].asInt();
}
void NvramConfig::InstanceSpecific::set_preferred_network_mode(int mode) {
(*Dictionary())[kPreferredNetworkMode] = mode;
}
bool NvramConfig::InstanceSpecific::emergency_mode() const {
return (*Dictionary())[kEmergencyMode].asBool();
}
void NvramConfig::InstanceSpecific::set_emergency_mode(bool mode) {
(*Dictionary())[kEmergencyMode] = mode;
}
int NvramConfig::sim_type() const {
return sim_type_;
}
} // namespace cuttlefish
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