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/*
* Copyright (C) 2021 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 "FlagProvider.h"
using server_configurable_flags::GetServerConfigurableFlag;
using std::string;
using std::vector;
namespace android {
namespace os {
namespace statsd {
FlagProvider::FlagProvider()
: mIsAtLeastSFunc(isAtLeastS), mGetServerFlagFunc(GetServerConfigurableFlag) {
}
FlagProvider& FlagProvider::getInstance() {
static FlagProvider instance;
return instance;
}
string FlagProvider::getFlagString(const string& flagName, const string& defaultValue) const {
return getFlagStringInternal(flagName, defaultValue, /* isBootFlag= */ false);
}
bool FlagProvider::getFlagBool(const string& flagName, const string& defaultValue) const {
return getFlagStringInternal(flagName, defaultValue, /* isBootFlag= */ false) == FLAG_TRUE;
}
string FlagProvider::getBootFlagString(const string& flagName, const string& defaultValue) const {
return getFlagStringInternal(flagName, defaultValue, /* isBootFlag= */ true);
}
bool FlagProvider::getBootFlagBool(const string& flagName, const string& defaultValue) const {
return getFlagStringInternal(flagName, defaultValue, /* isBootFlag= */ true) == FLAG_TRUE;
}
void FlagProvider::initBootFlags(const vector<string>& flags) {
std::lock_guard<std::mutex> lock(mFlagsMutex);
mBootFlags.clear();
for (const string& flagName : flags) {
string flagVal = mGetServerFlagFunc(STATSD_NATIVE_BOOT_NAMESPACE, flagName, FLAG_EMPTY);
if (flagVal != FLAG_EMPTY) {
mBootFlags[flagName] = flagVal;
}
}
}
void FlagProvider::overrideFlag(const string& flagName, const std::string& flagValue,
const bool isBootFlag) {
std::lock_guard<std::mutex> lock(mFlagsMutex);
mLocalFlags[getLocalFlagKey(flagName, isBootFlag)] = flagValue;
}
void FlagProvider::overrideFuncs(const IsAtLeastSFunc& isAtLeastSFunc,
const GetServerFlagFunc& getServerFlagFunc) {
std::lock_guard<std::mutex> lock(mFlagsMutex);
overrideFuncsLocked(isAtLeastSFunc, getServerFlagFunc);
}
void FlagProvider::overrideFuncsLocked(const IsAtLeastSFunc& isAtLeastSFunc,
const GetServerFlagFunc& getServerFlagFunc) {
mIsAtLeastSFunc = isAtLeastSFunc;
mGetServerFlagFunc = getServerFlagFunc;
}
string FlagProvider::getLocalFlagKey(const string& flagName, const bool isBootFlag) const {
return isBootFlag ? STATSD_NATIVE_BOOT_NAMESPACE + "." + flagName
: STATSD_NATIVE_NAMESPACE + "." + flagName;
}
string FlagProvider::getFlagStringInternal(const std::string& flagName,
const std::string& defaultValue,
const bool isBootFlag) const {
std::lock_guard<std::mutex> lock(mFlagsMutex);
if (!mIsAtLeastSFunc()) {
return defaultValue;
}
string localFlagKey = getLocalFlagKey(flagName, isBootFlag);
if (mLocalFlags.find(localFlagKey) != mLocalFlags.end()) {
return mLocalFlags.at(localFlagKey);
}
if (!isBootFlag) {
return mGetServerFlagFunc(STATSD_NATIVE_NAMESPACE, flagName, defaultValue);
}
const auto& it = mBootFlags.find(flagName);
return it == mBootFlags.end() ? defaultValue : it->second;
}
} // namespace statsd
} // namespace os
} // namespace android
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