cmds/statsd/src/StatsLogProcessor.cpp

/*
 * Copyright (C) 2017 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.
 */

#define DEBUG false  // STOPSHIP if true
#include "Log.h"

#include "StatsLogProcessor.h"

#include <android-base/file.h>
#include <cutils/multiuser.h>
#include <frameworks/base/cmds/statsd/src/active_config_list.pb.h>
#include <frameworks/base/cmds/statsd/src/experiment_ids.pb.h>

#include "android-base/stringprintf.h"
#include "atoms_info.h"
#include "external/StatsPullerManager.h"
#include "guardrail/StatsdStats.h"
#include "logd/LogEvent.h"
#include "metrics/CountMetricProducer.h"
#include "StatsService.h"
#include "state/StateManager.h"
#include "stats_log_util.h"
#include "stats_util.h"
#include "statslog_statsd.h"
#include "storage/StorageManager.h"

using namespace android;
using android::base::StringPrintf;
using android::util::FIELD_COUNT_REPEATED;
using android::util::FIELD_TYPE_BOOL;
using android::util::FIELD_TYPE_FLOAT;
using android::util::FIELD_TYPE_INT32;
using android::util::FIELD_TYPE_INT64;
using android::util::FIELD_TYPE_MESSAGE;
using android::util::FIELD_TYPE_STRING;
using android::util::ProtoOutputStream;
using std::vector;

namespace android {
namespace os {
namespace statsd {

// for ConfigMetricsReportList
const int FIELD_ID_CONFIG_KEY = 1;
const int FIELD_ID_REPORTS = 2;
// for ConfigKey
const int FIELD_ID_UID = 1;
const int FIELD_ID_ID = 2;
// for ConfigMetricsReport
// const int FIELD_ID_METRICS = 1; // written in MetricsManager.cpp
const int FIELD_ID_UID_MAP = 2;
const int FIELD_ID_LAST_REPORT_ELAPSED_NANOS = 3;
const int FIELD_ID_CURRENT_REPORT_ELAPSED_NANOS = 4;
const int FIELD_ID_LAST_REPORT_WALL_CLOCK_NANOS = 5;
const int FIELD_ID_CURRENT_REPORT_WALL_CLOCK_NANOS = 6;
const int FIELD_ID_DUMP_REPORT_REASON = 8;
const int FIELD_ID_STRINGS = 9;

// for ActiveConfigList
const int FIELD_ID_ACTIVE_CONFIG_LIST_CONFIG = 1;

// for permissions checks
constexpr const char* kPermissionDump = "android.permission.DUMP";
constexpr const char* kPermissionUsage = "android.permission.PACKAGE_USAGE_STATS";

#define NS_PER_HOUR 3600 * NS_PER_SEC

#define STATS_ACTIVE_METRIC_DIR "/data/misc/stats-active-metric"
#define STATS_METADATA_DIR "/data/misc/stats-metadata"

// Cool down period for writing data to disk to avoid overwriting files.
#define WRITE_DATA_COOL_DOWN_SEC 5

StatsLogProcessor::StatsLogProcessor(const sp<UidMap>& uidMap,
                                     const sp<StatsPullerManager>& pullerManager,
                                     const sp<AlarmMonitor>& anomalyAlarmMonitor,
                                     const sp<AlarmMonitor>& periodicAlarmMonitor,
                                     const int64_t timeBaseNs,
                                     const std::function<bool(const ConfigKey&)>& sendBroadcast,
                                     const std::function<bool(
                                            const int&, const vector<int64_t>&)>& activateBroadcast)
    : mUidMap(uidMap),
      mPullerManager(pullerManager),
      mAnomalyAlarmMonitor(anomalyAlarmMonitor),
      mPeriodicAlarmMonitor(periodicAlarmMonitor),
      mSendBroadcast(sendBroadcast),
      mSendActivationBroadcast(activateBroadcast),
      mTimeBaseNs(timeBaseNs),
      mLargestTimestampSeen(0),
      mLastTimestampSeen(0) {
    mPullerManager->ForceClearPullerCache();
}

StatsLogProcessor::~StatsLogProcessor() {
}

static void flushProtoToBuffer(ProtoOutputStream& proto, vector<uint8_t>* outData) {
    outData->clear();
    outData->resize(proto.size());
    size_t pos = 0;
    sp<android::util::ProtoReader> reader = proto.data();
    while (reader->readBuffer() != NULL) {
        size_t toRead = reader->currentToRead();
        std::memcpy(&((*outData)[pos]), reader->readBuffer(), toRead);
        pos += toRead;
        reader->move(toRead);
    }
}

void StatsLogProcessor::onAnomalyAlarmFired(
        const int64_t& timestampNs,
        unordered_set<sp<const InternalAlarm>, SpHash<InternalAlarm>> alarmSet) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    for (const auto& itr : mMetricsManagers) {
        itr.second->onAnomalyAlarmFired(timestampNs, alarmSet);
    }
}
void StatsLogProcessor::onPeriodicAlarmFired(
        const int64_t& timestampNs,
        unordered_set<sp<const InternalAlarm>, SpHash<InternalAlarm>> alarmSet) {

    std::lock_guard<std::mutex> lock(mMetricsMutex);
    for (const auto& itr : mMetricsManagers) {
        itr.second->onPeriodicAlarmFired(timestampNs, alarmSet);
    }
}

void StatsLogProcessor::mapIsolatedUidToHostUidIfNecessaryLocked(LogEvent* event) const {
    if (std::pair<int, int> indexRange; event->hasAttributionChain(&indexRange)) {
        vector<FieldValue>* const fieldValues = event->getMutableValues();
        for (int i = indexRange.first; i <= indexRange.second; i++) {
            FieldValue& fieldValue = fieldValues->at(i);
            if (isAttributionUidField(fieldValue)) {
                const int hostUid = mUidMap->getHostUidOrSelf(fieldValue.mValue.int_value);
                fieldValue.mValue.setInt(hostUid);
            }
        }
    } else {
        int uidFieldIndex = event->getUidFieldIndex();
        if (uidFieldIndex != -1) {
           Value& value = (*event->getMutableValues())[uidFieldIndex].mValue;
           const int hostUid = mUidMap->getHostUidOrSelf(value.int_value);
           value.setInt(hostUid);
        }
    }
}

void StatsLogProcessor::onIsolatedUidChangedEventLocked(const LogEvent& event) {
    status_t err = NO_ERROR, err2 = NO_ERROR, err3 = NO_ERROR;
    bool is_create = event.GetBool(3, &err);
    auto parent_uid = int(event.GetLong(1, &err2));
    auto isolated_uid = int(event.GetLong(2, &err3));
    if (err == NO_ERROR && err2 == NO_ERROR && err3 == NO_ERROR) {
        if (is_create) {
            mUidMap->assignIsolatedUid(isolated_uid, parent_uid);
        } else {
            mUidMap->removeIsolatedUid(isolated_uid);
        }
    } else {
        ALOGE("Failed to parse uid in the isolated uid change event.");
    }
}

void StatsLogProcessor::onBinaryPushStateChangedEventLocked(LogEvent* event) {
    pid_t pid = event->GetPid();
    uid_t uid = event->GetUid();
    if (!checkPermissionForIds(kPermissionDump, pid, uid) ||
        !checkPermissionForIds(kPermissionUsage, pid, uid)) {
        return;
    }
    // The Get* functions don't modify the status on success, they only write in
    // failure statuses, so we can use one status variable for all calls then
    // check if it is no longer NO_ERROR.
    status_t err = NO_ERROR;
    InstallTrainInfo trainInfo;
    trainInfo.trainName = string(event->GetString(1 /*train name field id*/, &err));
    trainInfo.trainVersionCode = event->GetLong(2 /*train version field id*/, &err);
    trainInfo.requiresStaging = event->GetBool(3 /*requires staging field id*/, &err);
    trainInfo.rollbackEnabled = event->GetBool(4 /*rollback enabled field id*/, &err);
    trainInfo.requiresLowLatencyMonitor =
            event->GetBool(5 /*requires low latency monitor field id*/, &err);
    trainInfo.status = int32_t(event->GetLong(6 /*state field id*/, &err));
    std::vector<uint8_t> trainExperimentIdBytes =
            event->GetStorage(7 /*experiment ids field id*/, &err);
    bool is_rollback = event->GetBool(10 /*is rollback field id*/, &err);

    if (err != NO_ERROR) {
        ALOGE("Failed to parse fields in binary push state changed log event");
        return;
    }
    ExperimentIds trainExperimentIds;
    if (!trainExperimentIds.ParseFromArray(trainExperimentIdBytes.data(),
                                           trainExperimentIdBytes.size())) {
        ALOGE("Failed to parse experimentids in binary push state changed.");
        return;
    }
    trainInfo.experimentIds = {trainExperimentIds.experiment_id().begin(),
                               trainExperimentIds.experiment_id().end()};

    // Update the train info on disk and get any data the logevent is missing.
    getAndUpdateTrainInfoOnDisk(is_rollback, &trainInfo);

    std::vector<uint8_t> trainExperimentIdProto;
    writeExperimentIdsToProto(trainInfo.experimentIds, &trainExperimentIdProto);
    int32_t userId = multiuser_get_user_id(uid);

    event->updateValue(2 /*train version field id*/, trainInfo.trainVersionCode, LONG);
    event->updateValue(7 /*experiment ids field id*/, trainExperimentIdProto, STORAGE);
    event->updateValue(8 /*user id field id*/, userId, INT);

    // If this event is a rollback event, then the following bits in the event
    // are invalid and we will need to update them with the values we pulled
    // from disk.
    if (is_rollback) {
        int bit = trainInfo.requiresStaging ? 1 : 0;
        event->updateValue(3 /*requires staging field id*/, bit, INT);
        bit = trainInfo.rollbackEnabled ? 1 : 0;
        event->updateValue(4 /*rollback enabled field id*/, bit, INT);
        bit = trainInfo.requiresLowLatencyMonitor ? 1 : 0;
        event->updateValue(5 /*requires low latency monitor field id*/, bit, INT);
    }
}

void StatsLogProcessor::getAndUpdateTrainInfoOnDisk(bool is_rollback,
                                                    InstallTrainInfo* trainInfo) {
    // If the train name is empty, we don't know which train to attribute the
    // event to, so return early.
    if (trainInfo->trainName.empty()) {
        return;
    }
    bool readTrainInfoSuccess = false;
    InstallTrainInfo trainInfoOnDisk;
    readTrainInfoSuccess = StorageManager::readTrainInfo(trainInfo->trainName, trainInfoOnDisk);

    bool resetExperimentIds = false;
    if (readTrainInfoSuccess) {
        // Keep the old train version if we received an empty version.
        if (trainInfo->trainVersionCode == -1) {
            trainInfo->trainVersionCode = trainInfoOnDisk.trainVersionCode;
        } else if (trainInfo->trainVersionCode != trainInfoOnDisk.trainVersionCode) {
            // Reset experiment ids if we receive a new non-empty train version.
            resetExperimentIds = true;
        }

        // Reset if we received a different experiment id.
        if (!trainInfo->experimentIds.empty() &&
            (trainInfoOnDisk.experimentIds.empty() ||
             trainInfo->experimentIds.at(0) != trainInfoOnDisk.experimentIds[0])) {
            resetExperimentIds = true;
        }
    }

    // Find the right experiment IDs
    if ((!resetExperimentIds || is_rollback) && readTrainInfoSuccess) {
        trainInfo->experimentIds = trainInfoOnDisk.experimentIds;
    }

    if (!trainInfo->experimentIds.empty()) {
        int64_t firstId = trainInfo->experimentIds.at(0);
        auto& ids = trainInfo->experimentIds;
        switch (trainInfo->status) {
            case android::os::statsd::util::BINARY_PUSH_STATE_CHANGED__STATE__INSTALL_SUCCESS:
                if (find(ids.begin(), ids.end(), firstId + 1) == ids.end()) {
                    ids.push_back(firstId + 1);
                }
                break;
            case android::os::statsd::util::BINARY_PUSH_STATE_CHANGED__STATE__INSTALLER_ROLLBACK_INITIATED:
                if (find(ids.begin(), ids.end(), firstId + 2) == ids.end()) {
                    ids.push_back(firstId + 2);
                }
                break;
            case android::os::statsd::util::BINARY_PUSH_STATE_CHANGED__STATE__INSTALLER_ROLLBACK_SUCCESS:
                if (find(ids.begin(), ids.end(), firstId + 3) == ids.end()) {
                    ids.push_back(firstId + 3);
                }
                break;
        }
    }

    // If this event is a rollback event, the following fields are invalid and
    // need to be replaced by the fields stored to disk.
    if (is_rollback) {
        trainInfo->requiresStaging = trainInfoOnDisk.requiresStaging;
        trainInfo->rollbackEnabled = trainInfoOnDisk.rollbackEnabled;
        trainInfo->requiresLowLatencyMonitor = trainInfoOnDisk.requiresLowLatencyMonitor;
    }

    StorageManager::writeTrainInfo(*trainInfo);
}

void StatsLogProcessor::onWatchdogRollbackOccurredLocked(LogEvent* event) {
    pid_t pid = event->GetPid();
    uid_t uid = event->GetUid();
    if (!checkPermissionForIds(kPermissionDump, pid, uid) ||
        !checkPermissionForIds(kPermissionUsage, pid, uid)) {
        return;
    }
    // The Get* functions don't modify the status on success, they only write in
    // failure statuses, so we can use one status variable for all calls then
    // check if it is no longer NO_ERROR.
    status_t err = NO_ERROR;
    int32_t rollbackType = int32_t(event->GetInt(1 /*rollback type field id*/, &err));
    string packageName = string(event->GetString(2 /*package name field id*/, &err));

    if (err != NO_ERROR) {
        ALOGE("Failed to parse fields in watchdog rollback occurred log event");
        return;
    }

    vector<int64_t> experimentIds =
        processWatchdogRollbackOccurred(rollbackType, packageName);
    vector<uint8_t> experimentIdProto;
    writeExperimentIdsToProto(experimentIds, &experimentIdProto);

    event->updateValue(6 /*experiment ids field id*/, experimentIdProto, STORAGE);
}

vector<int64_t> StatsLogProcessor::processWatchdogRollbackOccurred(const int32_t rollbackTypeIn,
                                                                    const string& packageNameIn) {
    // If the package name is empty, we can't attribute it to any train, so
    // return early.
    if (packageNameIn.empty()) {
      return vector<int64_t>();
    }
    bool readTrainInfoSuccess = false;
    InstallTrainInfo trainInfoOnDisk;
    // We use the package name of the event as the train name.
    readTrainInfoSuccess = StorageManager::readTrainInfo(packageNameIn, trainInfoOnDisk);

    if (!readTrainInfoSuccess) {
        return vector<int64_t>();
    }

    if (trainInfoOnDisk.experimentIds.empty()) {
        return vector<int64_t>();
    }

    int64_t firstId = trainInfoOnDisk.experimentIds[0];
    auto& ids = trainInfoOnDisk.experimentIds;
    switch (rollbackTypeIn) {
      case android::os::statsd::util::WATCHDOG_ROLLBACK_OCCURRED__ROLLBACK_TYPE__ROLLBACK_INITIATE:
            if (find(ids.begin(), ids.end(), firstId + 4) == ids.end()) {
                ids.push_back(firstId + 4);
            }
            StorageManager::writeTrainInfo(trainInfoOnDisk);
            break;
      case android::os::statsd::util::WATCHDOG_ROLLBACK_OCCURRED__ROLLBACK_TYPE__ROLLBACK_SUCCESS:
            if (find(ids.begin(), ids.end(), firstId + 5) == ids.end()) {
                ids.push_back(firstId + 5);
            }
            StorageManager::writeTrainInfo(trainInfoOnDisk);
            break;
    }

    return trainInfoOnDisk.experimentIds;
}

void StatsLogProcessor::resetConfigs() {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    resetConfigsLocked(getElapsedRealtimeNs());
}

void StatsLogProcessor::resetConfigsLocked(const int64_t timestampNs) {
    std::vector<ConfigKey> configKeys;
    for (auto it = mMetricsManagers.begin(); it != mMetricsManagers.end(); it++) {
        configKeys.push_back(it->first);
    }
    resetConfigsLocked(timestampNs, configKeys);
}

void StatsLogProcessor::OnLogEvent(LogEvent* event) {
    OnLogEvent(event, getElapsedRealtimeNs());
}

void StatsLogProcessor::OnLogEvent(LogEvent* event, int64_t elapsedRealtimeNs) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);

    // Hard-coded logic to update train info on disk and fill in any information
    // this log event may be missing.
    if (event->GetTagId() == android::os::statsd::util::BINARY_PUSH_STATE_CHANGED) {
        onBinaryPushStateChangedEventLocked(event);
    }

    // Hard-coded logic to update experiment ids on disk for certain rollback
    // types and fill the rollback atom with experiment ids
    if (event->GetTagId() == android::os::statsd::util::WATCHDOG_ROLLBACK_OCCURRED) {
        onWatchdogRollbackOccurredLocked(event);
    }

#ifdef VERY_VERBOSE_PRINTING
    if (mPrintAllLogs) {
        ALOGI("%s", event->ToString().c_str());
    }
#endif
    const int64_t eventElapsedTimeNs = event->GetElapsedTimestampNs();

    resetIfConfigTtlExpiredLocked(eventElapsedTimeNs);

    StatsdStats::getInstance().noteAtomLogged(
        event->GetTagId(), event->GetElapsedTimestampNs() / NS_PER_SEC);

    // Hard-coded logic to update the isolated uid's in the uid-map.
    // The field numbers need to be currently updated by hand with atoms.proto
    if (event->GetTagId() == android::os::statsd::util::ISOLATED_UID_CHANGED) {
        onIsolatedUidChangedEventLocked(*event);
    }

    StateManager::getInstance().onLogEvent(*event);

    if (mMetricsManagers.empty()) {
        return;
    }

    int64_t curTimeSec = getElapsedRealtimeSec();
    if (curTimeSec - mLastPullerCacheClearTimeSec > StatsdStats::kPullerCacheClearIntervalSec) {
        mPullerManager->ClearPullerCacheIfNecessary(curTimeSec * NS_PER_SEC);
        mLastPullerCacheClearTimeSec = curTimeSec;
    }


    if (event->GetTagId() != android::os::statsd::util::ISOLATED_UID_CHANGED) {
        // Map the isolated uid to host uid if necessary.
        mapIsolatedUidToHostUidIfNecessaryLocked(event);
    }

    std::unordered_set<int> uidsWithActiveConfigsChanged;
    std::unordered_map<int, std::vector<int64_t>> activeConfigsPerUid;
    // pass the event to metrics managers.
    for (auto& pair : mMetricsManagers) {
        int uid = pair.first.GetUid();
        int64_t configId = pair.first.GetId();
        bool isPrevActive = pair.second->isActive();
        pair.second->onLogEvent(*event);
        bool isCurActive = pair.second->isActive();
        // Map all active configs by uid.
        if (isCurActive) {
            auto activeConfigs = activeConfigsPerUid.find(uid);
            if (activeConfigs != activeConfigsPerUid.end()) {
                activeConfigs->second.push_back(configId);
            } else {
                vector<int64_t> newActiveConfigs;
                newActiveConfigs.push_back(configId);
                activeConfigsPerUid[uid] = newActiveConfigs;
            }
        }
        // The activation state of this config changed.
        if (isPrevActive != isCurActive) {
            VLOG("Active status changed for uid  %d", uid);
            uidsWithActiveConfigsChanged.insert(uid);
            StatsdStats::getInstance().noteActiveStatusChanged(pair.first, isCurActive);
        }
        flushIfNecessaryLocked(pair.first, *(pair.second));
    }

    // Don't use the event timestamp for the guardrail.
    for (int uid : uidsWithActiveConfigsChanged) {
        // Send broadcast so that receivers can pull data.
        auto lastBroadcastTime = mLastActivationBroadcastTimes.find(uid);
        if (lastBroadcastTime != mLastActivationBroadcastTimes.end()) {
            if (elapsedRealtimeNs - lastBroadcastTime->second <
                StatsdStats::kMinActivationBroadcastPeriodNs) {
                StatsdStats::getInstance().noteActivationBroadcastGuardrailHit(uid);
                VLOG("StatsD would've sent an activation broadcast but the rate limit stopped us.");
                return;
            }
        }
        auto activeConfigs = activeConfigsPerUid.find(uid);
        if (activeConfigs != activeConfigsPerUid.end()) {
            if (mSendActivationBroadcast(uid, activeConfigs->second)) {
                VLOG("StatsD sent activation notice for uid %d", uid);
                mLastActivationBroadcastTimes[uid] = elapsedRealtimeNs;
            }
        } else {
            std::vector<int64_t> emptyActiveConfigs;
            if (mSendActivationBroadcast(uid, emptyActiveConfigs)) {
                VLOG("StatsD sent EMPTY activation notice for uid %d", uid);
                mLastActivationBroadcastTimes[uid] = elapsedRealtimeNs;
            }
        }
    }
}

void StatsLogProcessor::GetActiveConfigs(const int uid, vector<int64_t>& outActiveConfigs) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    GetActiveConfigsLocked(uid, outActiveConfigs);
}

void StatsLogProcessor::GetActiveConfigsLocked(const int uid, vector<int64_t>& outActiveConfigs) {
    outActiveConfigs.clear();
    for (auto& pair : mMetricsManagers) {
        if (pair.first.GetUid() == uid && pair.second->isActive()) {
            outActiveConfigs.push_back(pair.first.GetId());
        }
    }
}

void StatsLogProcessor::OnConfigUpdated(const int64_t timestampNs, const ConfigKey& key,
                                        const StatsdConfig& config) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    WriteDataToDiskLocked(key, timestampNs, CONFIG_UPDATED, NO_TIME_CONSTRAINTS);
    OnConfigUpdatedLocked(timestampNs, key, config);
}

void StatsLogProcessor::OnConfigUpdatedLocked(
        const int64_t timestampNs, const ConfigKey& key, const StatsdConfig& config) {
    VLOG("Updated configuration for key %s", key.ToString().c_str());
    sp<MetricsManager> newMetricsManager =
            new MetricsManager(key, config, mTimeBaseNs, timestampNs, mUidMap, mPullerManager,
                               mAnomalyAlarmMonitor, mPeriodicAlarmMonitor);
    if (newMetricsManager->isConfigValid()) {
        newMetricsManager->init();
        mUidMap->OnConfigUpdated(key);
        newMetricsManager->refreshTtl(timestampNs);
        mMetricsManagers[key] = newMetricsManager;
        VLOG("StatsdConfig valid");
    } else {
        // If there is any error in the config, don't use it.
        ALOGE("StatsdConfig NOT valid");
    }
}

size_t StatsLogProcessor::GetMetricsSize(const ConfigKey& key) const {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    auto it = mMetricsManagers.find(key);
    if (it == mMetricsManagers.end()) {
        ALOGW("Config source %s does not exist", key.ToString().c_str());
        return 0;
    }
    return it->second->byteSize();
}

void StatsLogProcessor::dumpStates(int out, bool verbose) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    FILE* fout = fdopen(out, "w");
    if (fout == NULL) {
        return;
    }
    fprintf(fout, "MetricsManager count: %lu\n", (unsigned long)mMetricsManagers.size());
    for (auto metricsManager : mMetricsManagers) {
        metricsManager.second->dumpStates(fout, verbose);
    }

    fclose(fout);
}

/*
 * onDumpReport dumps serialized ConfigMetricsReportList into proto.
 */
void StatsLogProcessor::onDumpReport(const ConfigKey& key, const int64_t dumpTimeStampNs,
                                     const bool include_current_partial_bucket,
                                     const bool erase_data,
                                     const DumpReportReason dumpReportReason,
                                     const DumpLatency dumpLatency,
                                     ProtoOutputStream* proto) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);

    // Start of ConfigKey.
    uint64_t configKeyToken = proto->start(FIELD_TYPE_MESSAGE | FIELD_ID_CONFIG_KEY);
    proto->write(FIELD_TYPE_INT32 | FIELD_ID_UID, key.GetUid());
    proto->write(FIELD_TYPE_INT64 | FIELD_ID_ID, (long long)key.GetId());
    proto->end(configKeyToken);
    // End of ConfigKey.

    bool keepFile = false;
    auto it = mMetricsManagers.find(key);
    if (it != mMetricsManagers.end() && it->second->shouldPersistLocalHistory()) {
        keepFile = true;
    }

    // Then, check stats-data directory to see there's any file containing
    // ConfigMetricsReport from previous shutdowns to concatenate to reports.
    StorageManager::appendConfigMetricsReport(
            key, proto, erase_data && !keepFile /* should remove file after appending it */,
            dumpReportReason == ADB_DUMP /*if caller is adb*/);

    if (it != mMetricsManagers.end()) {
        // This allows another broadcast to be sent within the rate-limit period if we get close to
        // filling the buffer again soon.
        mLastBroadcastTimes.erase(key);

        vector<uint8_t> buffer;
        onConfigMetricsReportLocked(key, dumpTimeStampNs, include_current_partial_bucket,
                                    erase_data, dumpReportReason, dumpLatency,
                                    false /* is this data going to be saved on disk */, &buffer);
        proto->write(FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED | FIELD_ID_REPORTS,
                     reinterpret_cast<char*>(buffer.data()), buffer.size());
    } else {
        ALOGW("Config source %s does not exist", key.ToString().c_str());
    }
}

/*
 * onDumpReport dumps serialized ConfigMetricsReportList into outData.
 */
void StatsLogProcessor::onDumpReport(const ConfigKey& key, const int64_t dumpTimeStampNs,
                                     const bool include_current_partial_bucket,
                                     const bool erase_data,
                                     const DumpReportReason dumpReportReason,
                                     const DumpLatency dumpLatency,
                                     vector<uint8_t>* outData) {
    ProtoOutputStream proto;
    onDumpReport(key, dumpTimeStampNs, include_current_partial_bucket, erase_data,
                 dumpReportReason, dumpLatency, &proto);

    if (outData != nullptr) {
        flushProtoToBuffer(proto, outData);
        VLOG("output data size %zu", outData->size());
    }

    StatsdStats::getInstance().noteMetricsReportSent(key, proto.size());
}

/*
 * onConfigMetricsReportLocked dumps serialized ConfigMetricsReport into outData.
 */
void StatsLogProcessor::onConfigMetricsReportLocked(
        const ConfigKey& key, const int64_t dumpTimeStampNs,
        const bool include_current_partial_bucket, const bool erase_data,
        const DumpReportReason dumpReportReason, const DumpLatency dumpLatency,
        const bool dataSavedOnDisk, vector<uint8_t>* buffer) {
    // We already checked whether key exists in mMetricsManagers in
    // WriteDataToDisk.
    auto it = mMetricsManagers.find(key);
    if (it == mMetricsManagers.end()) {
        return;
    }
    int64_t lastReportTimeNs = it->second->getLastReportTimeNs();
    int64_t lastReportWallClockNs = it->second->getLastReportWallClockNs();

    std::set<string> str_set;

    ProtoOutputStream tempProto;
    // First, fill in ConfigMetricsReport using current data on memory, which
    // starts from filling in StatsLogReport's.
    it->second->onDumpReport(dumpTimeStampNs, include_current_partial_bucket, erase_data,
                             dumpLatency, &str_set, &tempProto);

    // Fill in UidMap if there is at least one metric to report.
    // This skips the uid map if it's an empty config.
    if (it->second->getNumMetrics() > 0) {
        uint64_t uidMapToken = tempProto.start(FIELD_TYPE_MESSAGE | FIELD_ID_UID_MAP);
        mUidMap->appendUidMap(
                dumpTimeStampNs, key, it->second->hashStringInReport() ? &str_set : nullptr,
                it->second->versionStringsInReport(), it->second->installerInReport(), &tempProto);
        tempProto.end(uidMapToken);
    }

    // Fill in the timestamps.
    tempProto.write(FIELD_TYPE_INT64 | FIELD_ID_LAST_REPORT_ELAPSED_NANOS,
                    (long long)lastReportTimeNs);
    tempProto.write(FIELD_TYPE_INT64 | FIELD_ID_CURRENT_REPORT_ELAPSED_NANOS,
                    (long long)dumpTimeStampNs);
    tempProto.write(FIELD_TYPE_INT64 | FIELD_ID_LAST_REPORT_WALL_CLOCK_NANOS,
                    (long long)lastReportWallClockNs);
    tempProto.write(FIELD_TYPE_INT64 | FIELD_ID_CURRENT_REPORT_WALL_CLOCK_NANOS,
                    (long long)getWallClockNs());
    // Dump report reason
    tempProto.write(FIELD_TYPE_INT32 | FIELD_ID_DUMP_REPORT_REASON, dumpReportReason);

    for (const auto& str : str_set) {
        tempProto.write(FIELD_TYPE_STRING | FIELD_COUNT_REPEATED | FIELD_ID_STRINGS, str);
    }

    flushProtoToBuffer(tempProto, buffer);

    // save buffer to disk if needed
    if (erase_data && !dataSavedOnDisk && it->second->shouldPersistLocalHistory()) {
        VLOG("save history to disk");
        string file_name = StorageManager::getDataHistoryFileName((long)getWallClockSec(),
                                                                  key.GetUid(), key.GetId());
        StorageManager::writeFile(file_name.c_str(), buffer->data(), buffer->size());
    }
}

void StatsLogProcessor::resetConfigsLocked(const int64_t timestampNs,
                                           const std::vector<ConfigKey>& configs) {
    for (const auto& key : configs) {
        StatsdConfig config;
        if (StorageManager::readConfigFromDisk(key, &config)) {
            OnConfigUpdatedLocked(timestampNs, key, config);
            StatsdStats::getInstance().noteConfigReset(key);
        } else {
            ALOGE("Failed to read backup config from disk for : %s", key.ToString().c_str());
            auto it = mMetricsManagers.find(key);
            if (it != mMetricsManagers.end()) {
                it->second->refreshTtl(timestampNs);
            }
        }
    }
}

void StatsLogProcessor::resetIfConfigTtlExpiredLocked(const int64_t timestampNs) {
    std::vector<ConfigKey> configKeysTtlExpired;
    for (auto it = mMetricsManagers.begin(); it != mMetricsManagers.end(); it++) {
        if (it->second != nullptr && !it->second->isInTtl(timestampNs)) {
            configKeysTtlExpired.push_back(it->first);
        }
    }
    if (configKeysTtlExpired.size() > 0) {
        WriteDataToDiskLocked(CONFIG_RESET, NO_TIME_CONSTRAINTS);
        resetConfigsLocked(timestampNs, configKeysTtlExpired);
    }
}

void StatsLogProcessor::OnConfigRemoved(const ConfigKey& key) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    auto it = mMetricsManagers.find(key);
    if (it != mMetricsManagers.end()) {
        WriteDataToDiskLocked(key, getElapsedRealtimeNs(), CONFIG_REMOVED,
                              NO_TIME_CONSTRAINTS);
        mMetricsManagers.erase(it);
        mUidMap->OnConfigRemoved(key);
    }
    StatsdStats::getInstance().noteConfigRemoved(key);

    mLastBroadcastTimes.erase(key);

    int uid = key.GetUid();
    bool lastConfigForUid = true;
    for (auto it : mMetricsManagers) {
        if (it.first.GetUid() == uid) {
            lastConfigForUid = false;
            break;
        }
    }
    if (lastConfigForUid) {
        mLastActivationBroadcastTimes.erase(uid);
    }

    if (mMetricsManagers.empty()) {
        mPullerManager->ForceClearPullerCache();
    }
}

void StatsLogProcessor::flushIfNecessaryLocked(const ConfigKey& key,
                                               MetricsManager& metricsManager) {
    int64_t elapsedRealtimeNs = getElapsedRealtimeNs();
    auto lastCheckTime = mLastByteSizeTimes.find(key);
    if (lastCheckTime != mLastByteSizeTimes.end()) {
        if (elapsedRealtimeNs - lastCheckTime->second < StatsdStats::kMinByteSizeCheckPeriodNs) {
            return;
        }
    }

    // We suspect that the byteSize() computation is expensive, so we set a rate limit.
    size_t totalBytes = metricsManager.byteSize();
    mLastByteSizeTimes[key] = elapsedRealtimeNs;
    bool requestDump = false;
    if (totalBytes > StatsdStats::kMaxMetricsBytesPerConfig) {
        // Too late. We need to start clearing data.
        metricsManager.dropData(elapsedRealtimeNs);
        StatsdStats::getInstance().noteDataDropped(key, totalBytes);
        VLOG("StatsD had to toss out metrics for %s", key.ToString().c_str());
    } else if ((totalBytes > StatsdStats::kBytesPerConfigTriggerGetData) ||
               (mOnDiskDataConfigs.find(key) != mOnDiskDataConfigs.end())) {
        // Request to send a broadcast if:
        // 1. in memory data > threshold   OR
        // 2. config has old data report on disk.
        requestDump = true;
    }

    if (requestDump) {
        // Send broadcast so that receivers can pull data.
        auto lastBroadcastTime = mLastBroadcastTimes.find(key);
        if (lastBroadcastTime != mLastBroadcastTimes.end()) {
            if (elapsedRealtimeNs - lastBroadcastTime->second <
                    StatsdStats::kMinBroadcastPeriodNs) {
                VLOG("StatsD would've sent a broadcast but the rate limit stopped us.");
                return;
            }
        }
        if (mSendBroadcast(key)) {
            mOnDiskDataConfigs.erase(key);
            VLOG("StatsD triggered data fetch for %s", key.ToString().c_str());
            mLastBroadcastTimes[key] = elapsedRealtimeNs;
            StatsdStats::getInstance().noteBroadcastSent(key);
        }
    }
}

void StatsLogProcessor::WriteDataToDiskLocked(const ConfigKey& key,
                                              const int64_t timestampNs,
                                              const DumpReportReason dumpReportReason,
                                              const DumpLatency dumpLatency) {
    if (mMetricsManagers.find(key) == mMetricsManagers.end() ||
        !mMetricsManagers.find(key)->second->shouldWriteToDisk()) {
        return;
    }
    vector<uint8_t> buffer;
    onConfigMetricsReportLocked(key, timestampNs, true /* include_current_partial_bucket*/,
                                true /* erase_data */, dumpReportReason, dumpLatency, true,
                                &buffer);
    string file_name =
            StorageManager::getDataFileName((long)getWallClockSec(), key.GetUid(), key.GetId());
    StorageManager::writeFile(file_name.c_str(), buffer.data(), buffer.size());

    // We were able to write the ConfigMetricsReport to disk, so we should trigger collection ASAP.
    mOnDiskDataConfigs.insert(key);
}

void StatsLogProcessor::SaveActiveConfigsToDisk(int64_t currentTimeNs) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    const int64_t timeNs = getElapsedRealtimeNs();
    // Do not write to disk if we already have in the last few seconds.
    if (static_cast<unsigned long long> (timeNs) <
            mLastActiveMetricsWriteNs + WRITE_DATA_COOL_DOWN_SEC * NS_PER_SEC) {
        ALOGI("Statsd skipping writing active metrics to disk. Already wrote data in last %d seconds",
                WRITE_DATA_COOL_DOWN_SEC);
        return;
    }
    mLastActiveMetricsWriteNs = timeNs;

    ProtoOutputStream proto;
    WriteActiveConfigsToProtoOutputStreamLocked(currentTimeNs, DEVICE_SHUTDOWN, &proto);

    string file_name = StringPrintf("%s/active_metrics", STATS_ACTIVE_METRIC_DIR);
    StorageManager::deleteFile(file_name.c_str());
    android::base::unique_fd fd(
            open(file_name.c_str(), O_WRONLY | O_CREAT | O_CLOEXEC, S_IRUSR | S_IWUSR));
    if (fd == -1) {
        ALOGE("Attempt to write %s but failed", file_name.c_str());
        return;
    }
    proto.flush(fd.get());
}

void StatsLogProcessor::SaveMetadataToDisk(int64_t currentWallClockTimeNs,
                                           int64_t systemElapsedTimeNs) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    // Do not write to disk if we already have in the last few seconds.
    if (static_cast<unsigned long long> (systemElapsedTimeNs) <
            mLastMetadataWriteNs + WRITE_DATA_COOL_DOWN_SEC * NS_PER_SEC) {
        ALOGI("Statsd skipping writing metadata to disk. Already wrote data in last %d seconds",
                WRITE_DATA_COOL_DOWN_SEC);
        return;
    }
    mLastMetadataWriteNs = systemElapsedTimeNs;

    metadata::StatsMetadataList metadataList;
    WriteMetadataToProtoLocked(
            currentWallClockTimeNs, systemElapsedTimeNs, &metadataList);

    string file_name = StringPrintf("%s/metadata", STATS_METADATA_DIR);
    StorageManager::deleteFile(file_name.c_str());

    if (metadataList.stats_metadata_size() == 0) {
        // Skip the write if we have nothing to write.
        return;
    }

    std::string data;
    metadataList.SerializeToString(&data);
    StorageManager::writeFile(file_name.c_str(), data.c_str(), data.size());
}

void StatsLogProcessor::WriteMetadataToProto(int64_t currentWallClockTimeNs,
                                             int64_t systemElapsedTimeNs,
                                             metadata::StatsMetadataList* metadataList) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    WriteMetadataToProtoLocked(currentWallClockTimeNs, systemElapsedTimeNs, metadataList);
}

void StatsLogProcessor::WriteMetadataToProtoLocked(int64_t currentWallClockTimeNs,
                                                   int64_t systemElapsedTimeNs,
                                                   metadata::StatsMetadataList* metadataList) {
    for (const auto& pair : mMetricsManagers) {
        const sp<MetricsManager>& metricsManager = pair.second;
        metadata::StatsMetadata* statsMetadata = metadataList->add_stats_metadata();
        bool metadataWritten = metricsManager->writeMetadataToProto(currentWallClockTimeNs,
                systemElapsedTimeNs, statsMetadata);
        if (!metadataWritten) {
            metadataList->mutable_stats_metadata()->RemoveLast();
        }
    }
}

void StatsLogProcessor::LoadMetadataFromDisk(int64_t currentWallClockTimeNs,
                                             int64_t systemElapsedTimeNs) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    string file_name = StringPrintf("%s/metadata", STATS_METADATA_DIR);
    int fd = open(file_name.c_str(), O_RDONLY | O_CLOEXEC);
    if (-1 == fd) {
        VLOG("Attempt to read %s but failed", file_name.c_str());
        StorageManager::deleteFile(file_name.c_str());
        return;
    }
    string content;
    if (!android::base::ReadFdToString(fd, &content)) {
        ALOGE("Attempt to read %s but failed", file_name.c_str());
        close(fd);
        StorageManager::deleteFile(file_name.c_str());
        return;
    }

    close(fd);

    metadata::StatsMetadataList statsMetadataList;
    if (!statsMetadataList.ParseFromString(content)) {
        ALOGE("Attempt to read %s but failed; failed to metadata", file_name.c_str());
        StorageManager::deleteFile(file_name.c_str());
        return;
    }
    SetMetadataStateLocked(statsMetadataList, currentWallClockTimeNs, systemElapsedTimeNs);
    StorageManager::deleteFile(file_name.c_str());
}

void StatsLogProcessor::SetMetadataState(const metadata::StatsMetadataList& statsMetadataList,
                                         int64_t currentWallClockTimeNs,
                                         int64_t systemElapsedTimeNs) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    SetMetadataStateLocked(statsMetadataList, currentWallClockTimeNs, systemElapsedTimeNs);
}

void StatsLogProcessor::SetMetadataStateLocked(
        const metadata::StatsMetadataList& statsMetadataList,
        int64_t currentWallClockTimeNs,
        int64_t systemElapsedTimeNs) {
    for (const metadata::StatsMetadata& metadata : statsMetadataList.stats_metadata()) {
        ConfigKey key(metadata.config_key().uid(), metadata.config_key().config_id());
        auto it = mMetricsManagers.find(key);
        if (it == mMetricsManagers.end()) {
            ALOGE("No config found for configKey %s", key.ToString().c_str());
            continue;
        }
        VLOG("Setting metadata %s", key.ToString().c_str());
        it->second->loadMetadata(metadata, currentWallClockTimeNs, systemElapsedTimeNs);
    }
    VLOG("Successfully loaded %d metadata.", statsMetadataList.stats_metadata_size());
}

void StatsLogProcessor::WriteActiveConfigsToProtoOutputStream(
        int64_t currentTimeNs, const DumpReportReason reason, ProtoOutputStream* proto) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    WriteActiveConfigsToProtoOutputStreamLocked(currentTimeNs, reason, proto);
}

void StatsLogProcessor::WriteActiveConfigsToProtoOutputStreamLocked(
        int64_t currentTimeNs,  const DumpReportReason reason, ProtoOutputStream* proto) {
    for (const auto& pair : mMetricsManagers) {
        const sp<MetricsManager>& metricsManager = pair.second;
        uint64_t configToken = proto->start(FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED |
                                                     FIELD_ID_ACTIVE_CONFIG_LIST_CONFIG);
        metricsManager->writeActiveConfigToProtoOutputStream(currentTimeNs, reason, proto);
        proto->end(configToken);
    }
}
void StatsLogProcessor::LoadActiveConfigsFromDisk() {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    string file_name = StringPrintf("%s/active_metrics", STATS_ACTIVE_METRIC_DIR);
    int fd = open(file_name.c_str(), O_RDONLY | O_CLOEXEC);
    if (-1 == fd) {
        VLOG("Attempt to read %s but failed", file_name.c_str());
        StorageManager::deleteFile(file_name.c_str());
        return;
    }
    string content;
    if (!android::base::ReadFdToString(fd, &content)) {
        ALOGE("Attempt to read %s but failed", file_name.c_str());
        close(fd);
        StorageManager::deleteFile(file_name.c_str());
        return;
    }

    close(fd);

    ActiveConfigList activeConfigList;
    if (!activeConfigList.ParseFromString(content)) {
        ALOGE("Attempt to read %s but failed; failed to load active configs", file_name.c_str());
        StorageManager::deleteFile(file_name.c_str());
        return;
    }
    // Passing in mTimeBaseNs only works as long as we only load from disk is when statsd starts.
    SetConfigsActiveStateLocked(activeConfigList, mTimeBaseNs);
    StorageManager::deleteFile(file_name.c_str());
}

void StatsLogProcessor::SetConfigsActiveState(const ActiveConfigList& activeConfigList,
                                                    int64_t currentTimeNs) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    SetConfigsActiveStateLocked(activeConfigList, currentTimeNs);
}

void StatsLogProcessor::SetConfigsActiveStateLocked(const ActiveConfigList& activeConfigList,
                                                    int64_t currentTimeNs) {
    for (int i = 0; i < activeConfigList.config_size(); i++) {
        const auto& config = activeConfigList.config(i);
        ConfigKey key(config.uid(), config.id());
        auto it = mMetricsManagers.find(key);
        if (it == mMetricsManagers.end()) {
            ALOGE("No config found for config %s", key.ToString().c_str());
            continue;
        }
        VLOG("Setting active config %s", key.ToString().c_str());
        it->second->loadActiveConfig(config, currentTimeNs);
    }
    VLOG("Successfully loaded %d active configs.", activeConfigList.config_size());
}

void StatsLogProcessor::WriteDataToDiskLocked(const DumpReportReason dumpReportReason,
                                              const DumpLatency dumpLatency) {
    const int64_t timeNs = getElapsedRealtimeNs();
    // Do not write to disk if we already have in the last few seconds.
    // This is to avoid overwriting files that would have the same name if we
    //   write twice in the same second.
    if (static_cast<unsigned long long> (timeNs) <
            mLastWriteTimeNs + WRITE_DATA_COOL_DOWN_SEC * NS_PER_SEC) {
        ALOGI("Statsd skipping writing data to disk. Already wrote data in last %d seconds",
                WRITE_DATA_COOL_DOWN_SEC);
        return;
    }
    mLastWriteTimeNs = timeNs;
    for (auto& pair : mMetricsManagers) {
        WriteDataToDiskLocked(pair.first, timeNs, dumpReportReason, dumpLatency);
    }
}

void StatsLogProcessor::WriteDataToDisk(const DumpReportReason dumpReportReason,
                                        const DumpLatency dumpLatency) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    WriteDataToDiskLocked(dumpReportReason, dumpLatency);
}

void StatsLogProcessor::informPullAlarmFired(const int64_t timestampNs) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    mPullerManager->OnAlarmFired(timestampNs);
}

int64_t StatsLogProcessor::getLastReportTimeNs(const ConfigKey& key) {
    auto it = mMetricsManagers.find(key);
    if (it == mMetricsManagers.end()) {
        return 0;
    } else {
        return it->second->getLastReportTimeNs();
    }
}

void StatsLogProcessor::notifyAppUpgrade(const int64_t& eventTimeNs, const string& apk,
                                         const int uid, const int64_t version) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    ALOGW("Received app upgrade");
    for (auto it : mMetricsManagers) {
        it.second->notifyAppUpgrade(eventTimeNs, apk, uid, version);
    }
}

void StatsLogProcessor::notifyAppRemoved(const int64_t& eventTimeNs, const string& apk,
                                         const int uid) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    ALOGW("Received app removed");
    for (auto it : mMetricsManagers) {
        it.second->notifyAppRemoved(eventTimeNs, apk, uid);
    }
}

void StatsLogProcessor::onUidMapReceived(const int64_t& eventTimeNs) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    ALOGW("Received uid map");
    for (auto it : mMetricsManagers) {
        it.second->onUidMapReceived(eventTimeNs);
    }
}

void StatsLogProcessor::noteOnDiskData(const ConfigKey& key) {
    std::lock_guard<std::mutex> lock(mMetricsMutex);
    mOnDiskDataConfigs.insert(key);
}

}  // namespace statsd
}  // namespace os
}  // namespace android