cmds/statsd/src/StatsLogProcessor.cpp - LeafOS-Project/android_frameworks_base - Gitiles

 /*
  * 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 "statslog.h"

 #include <android-base/file.h>
 #include <dirent.h>
 #include "StatsLogProcessor.h"
 #include "stats_log_util.h"
 #include "android-base/stringprintf.h"
 #include "guardrail/StatsdStats.h"
 #include "metrics/CountMetricProducer.h"
 #include "external/StatsPullerManager.h"
 #include "stats_util.h"
 #include "storage/StorageManager.h"

 #include <log/log_event_list.h>
 #include <utils/Errors.h>
 #include <utils/SystemClock.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::make_unique;
 using std::unique_ptr;
 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;

 #define NS_PER_HOUR 3600 * NS_PER_SEC

 #define STATS_DATA_DIR "/data/misc/stats-data"

 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)
     : mUidMap(uidMap),
       mPullerManager(pullerManager),
       mAnomalyAlarmMonitor(anomalyAlarmMonitor),
       mPeriodicAlarmMonitor(periodicAlarmMonitor),
       mSendBroadcast(sendBroadcast),
       mTimeBaseNs(timeBaseNs),
       mLargestTimestampSeen(0),
       mLastTimestampSeen(0) {
     mPullerManager->ForceClearPullerCache();
 }

 StatsLogProcessor::~StatsLogProcessor() {
 }

 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 updateUid(Value* value, int hostUid) {
     int uid = value->int_value;
     if (uid != hostUid) {
         value->setInt(hostUid);
     }
 }

 void StatsLogProcessor::mapIsolatedUidToHostUidIfNecessaryLocked(LogEvent* event) const {
     if (android::util::AtomsInfo::kAtomsWithAttributionChain.find(event->GetTagId()) !=
         android::util::AtomsInfo::kAtomsWithAttributionChain.end()) {
         for (auto& value : *(event->getMutableValues())) {
             if (value.mField.getPosAtDepth(0) > kAttributionField) {
                 break;
             }
             if (isAttributionUidField(value)) {
                 const int hostUid = mUidMap->getHostUidOrSelf(value.mValue.int_value);
                 updateUid(&value.mValue, hostUid);
             }
         }
     } else {
         auto it = android::util::AtomsInfo::kAtomsWithUidField.find(event->GetTagId());
         if (it != android::util::AtomsInfo::kAtomsWithUidField.end()) {
             int uidField = it->second;  // uidField is the field number in proto,
                                         // starting from 1
             if (uidField > 0 && (int)event->getValues().size() >= uidField &&
                 (event->getValues())[uidField - 1].mValue.getType() == INT) {
                 Value& value = (*event->getMutableValues())[uidField - 1].mValue;
                 const int hostUid = mUidMap->getHostUidOrSelf(value.int_value);
                 updateUid(&value, hostUid);
             } else {
                 ALOGE("Malformed log, uid not found. %s", event->ToString().c_str());
             }
         }
     }
 }

 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::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) {
     std::lock_guard<std::mutex> lock(mMetricsMutex);

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

     resetIfConfigTtlExpiredLocked(currentTimestampNs);

     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::util::ISOLATED_UID_CHANGED) {
         onIsolatedUidChangedEventLocked(*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::util::ISOLATED_UID_CHANGED) {
         // Map the isolated uid to host uid if necessary.
         mapIsolatedUidToHostUidIfNecessaryLocked(event);
     }

     // pass the event to metrics managers.
     for (auto& pair : mMetricsManagers) {
         pair.second->onLogEvent(*event);
         flushIfNecessaryLocked(event->GetElapsedTimestampNs(), pair.first, *(pair.second));
     }
 }

 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);
     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()) {
         mUidMap->OnConfigUpdated(key);
         if (newMetricsManager->shouldAddUidMapListener()) {
             // We have to add listener after the MetricsManager is constructed because it's
             // not safe to create wp or sp from this pointer inside its constructor.
             mUidMap->addListener(newMetricsManager.get());
         }
         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(FILE* out, bool verbose) {
     std::lock_guard<std::mutex> lock(mMetricsMutex);
     fprintf(out, "MetricsManager count: %lu\n", (unsigned long)mMetricsManagers.size());
     for (auto metricsManager : mMetricsManagers) {
         metricsManager.second->dumpStates(out, verbose);
     }
 }

 /*
  * onDumpReport dumps serialized ConfigMetricsReportList into outData.
  */
 void StatsLogProcessor::onDumpReport(const ConfigKey& key, const int64_t dumpTimeStampNs,
                                      const bool include_current_partial_bucket,
                                      const DumpReportReason dumpReportReason,
                                      vector<uint8_t>* outData) {
     std::lock_guard<std::mutex> lock(mMetricsMutex);

     ProtoOutputStream proto;

     // 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.

     // Then, check stats-data directory to see there's any file containing
     // ConfigMetricsReport from previous shutdowns to concatenate to reports.
     StorageManager::appendConfigMetricsReport(key, &proto);

     auto it = mMetricsManagers.find(key);
     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);

         // Start of ConfigMetricsReport (reports).
         uint64_t reportsToken =
                 proto.start(FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED | FIELD_ID_REPORTS);
         onConfigMetricsReportLocked(key, dumpTimeStampNs, include_current_partial_bucket,
                                     dumpReportReason, &proto);
         proto.end(reportsToken);
         // End of ConfigMetricsReport (reports).
     } else {
         ALOGW("Config source %s does not exist", key.ToString().c_str());
     }

     if (outData != nullptr) {
         outData->clear();
         outData->resize(proto.size());
         size_t pos = 0;
         auto iter = proto.data();
         while (iter.readBuffer() != NULL) {
             size_t toRead = iter.currentToRead();
             std::memcpy(&((*outData)[pos]), iter.readBuffer(), toRead);
             pos += toRead;
             iter.rp()->move(toRead);
         }
     }

     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 DumpReportReason dumpReportReason,
                                                     ProtoOutputStream* proto) {
     // 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;

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

     // 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 = proto->start(FIELD_TYPE_MESSAGE | FIELD_ID_UID_MAP);
         if (it->second->hashStringInReport()) {
             mUidMap->appendUidMap(dumpTimeStampNs, key, &str_set, proto);
         } else {
             mUidMap->appendUidMap(dumpTimeStampNs, key, nullptr, proto);
         }
         proto->end(uidMapToken);
     }

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

     for (const auto& str : str_set) {
         proto->write(FIELD_TYPE_STRING | FIELD_COUNT_REPEATED | FIELD_ID_STRINGS, str);
     }
 }

 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);
         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);
         mMetricsManagers.erase(it);
         mUidMap->OnConfigRemoved(key);
     }
     StatsdStats::getInstance().noteConfigRemoved(key);

     mLastBroadcastTimes.erase(key);

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

 void StatsLogProcessor::flushIfNecessaryLocked(
     int64_t timestampNs, const ConfigKey& key, MetricsManager& metricsManager) {
     auto lastCheckTime = mLastByteSizeTimes.find(key);
     if (lastCheckTime != mLastByteSizeTimes.end()) {
         if (timestampNs - 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] = timestampNs;
     bool requestDump = false;
     if (totalBytes >
         StatsdStats::kMaxMetricsBytesPerConfig) {  // Too late. We need to start clearing data.
         metricsManager.dropData(timestampNs);
         StatsdStats::getInstance().noteDataDropped(key);
         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 (timestampNs - 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] = timestampNs;
             StatsdStats::getInstance().noteBroadcastSent(key);
         }
     }
 }

 void StatsLogProcessor::WriteDataToDiskLocked(const ConfigKey& key,
                                               const int64_t timestampNs,
                                               const DumpReportReason dumpReportReason) {
     if (mMetricsManagers.find(key) == mMetricsManagers.end() ||
         !mMetricsManagers.find(key)->second->shouldWriteToDisk()) {
         return;
     }
     ProtoOutputStream proto;
     onConfigMetricsReportLocked(key, timestampNs, true /* include_current_partial_bucket*/,
                                 dumpReportReason, &proto);
     string file_name = StringPrintf("%s/%ld_%d_%lld", STATS_DATA_DIR,
          (long)getWallClockSec(), key.GetUid(), (long long)key.GetId());
     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());
     // We were able to write the ConfigMetricsReport to disk, so we should trigger collection ASAP.
     mOnDiskDataConfigs.insert(key);
 }

 void StatsLogProcessor::WriteDataToDiskLocked(const DumpReportReason dumpReportReason) {
     const int64_t timeNs = getElapsedRealtimeNs();
     for (auto& pair : mMetricsManagers) {
         WriteDataToDiskLocked(pair.first, timeNs, dumpReportReason);
     }
 }

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

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

 }  // namespace statsd
 }  // namespace os
 }  // namespace android
	/*
	* 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 "statslog.h"

	#include <android-base/file.h>
	#include <dirent.h>
	#include "StatsLogProcessor.h"
	#include "stats_log_util.h"
	#include "android-base/stringprintf.h"
	#include "guardrail/StatsdStats.h"
	#include "metrics/CountMetricProducer.h"
	#include "external/StatsPullerManager.h"
	#include "stats_util.h"
	#include "storage/StorageManager.h"

	#include <log/log_event_list.h>
	#include <utils/Errors.h>
	#include <utils/SystemClock.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::make_unique;
	using std::unique_ptr;
	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;

	#define NS_PER_HOUR 3600 * NS_PER_SEC

	#define STATS_DATA_DIR "/data/misc/stats-data"

	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)
	: mUidMap(uidMap),
	mPullerManager(pullerManager),
	mAnomalyAlarmMonitor(anomalyAlarmMonitor),
	mPeriodicAlarmMonitor(periodicAlarmMonitor),
	mSendBroadcast(sendBroadcast),
	mTimeBaseNs(timeBaseNs),
	mLargestTimestampSeen(0),
	mLastTimestampSeen(0) {
	mPullerManager->ForceClearPullerCache();
	}

	StatsLogProcessor::~StatsLogProcessor() {
	}

	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 updateUid(Value* value, int hostUid) {
	int uid = value->int_value;
	if (uid != hostUid) {
	value->setInt(hostUid);
	}
	}

	void StatsLogProcessor::mapIsolatedUidToHostUidIfNecessaryLocked(LogEvent* event) const {
	if (android::util::AtomsInfo::kAtomsWithAttributionChain.find(event->GetTagId()) !=
	android::util::AtomsInfo::kAtomsWithAttributionChain.end()) {
	for (auto& value : *(event->getMutableValues())) {
	if (value.mField.getPosAtDepth(0) > kAttributionField) {
	break;
	}
	if (isAttributionUidField(value)) {
	const int hostUid = mUidMap->getHostUidOrSelf(value.mValue.int_value);
	updateUid(&value.mValue, hostUid);
	}
	}
	} else {
	auto it = android::util::AtomsInfo::kAtomsWithUidField.find(event->GetTagId());
	if (it != android::util::AtomsInfo::kAtomsWithUidField.end()) {
	int uidField = it->second; // uidField is the field number in proto,
	// starting from 1
	if (uidField > 0 && (int)event->getValues().size() >= uidField &&
	(event->getValues())[uidField - 1].mValue.getType() == INT) {
	Value& value = (*event->getMutableValues())[uidField - 1].mValue;
	const int hostUid = mUidMap->getHostUidOrSelf(value.int_value);
	updateUid(&value, hostUid);
	} else {
	ALOGE("Malformed log, uid not found. %s", event->ToString().c_str());
	}
	}
	}
	}

	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::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) {
	std::lock_guard<std::mutex> lock(mMetricsMutex);

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

	resetIfConfigTtlExpiredLocked(currentTimestampNs);

	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::util::ISOLATED_UID_CHANGED) {
	onIsolatedUidChangedEventLocked(*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::util::ISOLATED_UID_CHANGED) {
	// Map the isolated uid to host uid if necessary.
	mapIsolatedUidToHostUidIfNecessaryLocked(event);
	}

	// pass the event to metrics managers.
	for (auto& pair : mMetricsManagers) {
	pair.second->onLogEvent(*event);
	flushIfNecessaryLocked(event->GetElapsedTimestampNs(), pair.first, *(pair.second));
	}
	}

	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);
	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()) {
	mUidMap->OnConfigUpdated(key);
	if (newMetricsManager->shouldAddUidMapListener()) {
	// We have to add listener after the MetricsManager is constructed because it's
	// not safe to create wp or sp from this pointer inside its constructor.
	mUidMap->addListener(newMetricsManager.get());
	}
	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(FILE* out, bool verbose) {
	std::lock_guard<std::mutex> lock(mMetricsMutex);
	fprintf(out, "MetricsManager count: %lu\n", (unsigned long)mMetricsManagers.size());
	for (auto metricsManager : mMetricsManagers) {
	metricsManager.second->dumpStates(out, verbose);
	}
	}

	/*
	* onDumpReport dumps serialized ConfigMetricsReportList into outData.
	*/
	void StatsLogProcessor::onDumpReport(const ConfigKey& key, const int64_t dumpTimeStampNs,
	const bool include_current_partial_bucket,
	const DumpReportReason dumpReportReason,
	vector<uint8_t>* outData) {
	std::lock_guard<std::mutex> lock(mMetricsMutex);

	ProtoOutputStream proto;

	// 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.

	// Then, check stats-data directory to see there's any file containing
	// ConfigMetricsReport from previous shutdowns to concatenate to reports.
	StorageManager::appendConfigMetricsReport(key, &proto);

	auto it = mMetricsManagers.find(key);
	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);

	// Start of ConfigMetricsReport (reports).
	uint64_t reportsToken =
	proto.start(FIELD_TYPE_MESSAGE \| FIELD_COUNT_REPEATED \| FIELD_ID_REPORTS);
	onConfigMetricsReportLocked(key, dumpTimeStampNs, include_current_partial_bucket,
	dumpReportReason, &proto);
	proto.end(reportsToken);
	// End of ConfigMetricsReport (reports).
	} else {
	ALOGW("Config source %s does not exist", key.ToString().c_str());
	}

	if (outData != nullptr) {
	outData->clear();
	outData->resize(proto.size());
	size_t pos = 0;
	auto iter = proto.data();
	while (iter.readBuffer() != NULL) {
	size_t toRead = iter.currentToRead();
	std::memcpy(&((*outData)[pos]), iter.readBuffer(), toRead);
	pos += toRead;
	iter.rp()->move(toRead);
	}
	}

	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 DumpReportReason dumpReportReason,
	ProtoOutputStream* proto) {
	// 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;

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

	// 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 = proto->start(FIELD_TYPE_MESSAGE \| FIELD_ID_UID_MAP);
	if (it->second->hashStringInReport()) {
	mUidMap->appendUidMap(dumpTimeStampNs, key, &str_set, proto);
	} else {
	mUidMap->appendUidMap(dumpTimeStampNs, key, nullptr, proto);
	}
	proto->end(uidMapToken);
	}

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

	for (const auto& str : str_set) {
	proto->write(FIELD_TYPE_STRING \| FIELD_COUNT_REPEATED \| FIELD_ID_STRINGS, str);
	}
	}

	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);
	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);
	mMetricsManagers.erase(it);
	mUidMap->OnConfigRemoved(key);
	}
	StatsdStats::getInstance().noteConfigRemoved(key);

	mLastBroadcastTimes.erase(key);

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

	void StatsLogProcessor::flushIfNecessaryLocked(
	int64_t timestampNs, const ConfigKey& key, MetricsManager& metricsManager) {
	auto lastCheckTime = mLastByteSizeTimes.find(key);
	if (lastCheckTime != mLastByteSizeTimes.end()) {
	if (timestampNs - 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] = timestampNs;
	bool requestDump = false;
	if (totalBytes >
	StatsdStats::kMaxMetricsBytesPerConfig) { // Too late. We need to start clearing data.
	metricsManager.dropData(timestampNs);
	StatsdStats::getInstance().noteDataDropped(key);
	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 (timestampNs - 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] = timestampNs;
	StatsdStats::getInstance().noteBroadcastSent(key);
	}
	}
	}

	void StatsLogProcessor::WriteDataToDiskLocked(const ConfigKey& key,
	const int64_t timestampNs,
	const DumpReportReason dumpReportReason) {
	if (mMetricsManagers.find(key) == mMetricsManagers.end() \|\|
	!mMetricsManagers.find(key)->second->shouldWriteToDisk()) {
	return;
	}
	ProtoOutputStream proto;
	onConfigMetricsReportLocked(key, timestampNs, true /* include_current_partial_bucket*/,
	dumpReportReason, &proto);
	string file_name = StringPrintf("%s/%ld_%d_%lld", STATS_DATA_DIR,
	(long)getWallClockSec(), key.GetUid(), (long long)key.GetId());
	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());
	// We were able to write the ConfigMetricsReport to disk, so we should trigger collection ASAP.
	mOnDiskDataConfigs.insert(key);
	}

	void StatsLogProcessor::WriteDataToDiskLocked(const DumpReportReason dumpReportReason) {
	const int64_t timeNs = getElapsedRealtimeNs();
	for (auto& pair : mMetricsManagers) {
	WriteDataToDiskLocked(pair.first, timeNs, dumpReportReason);
	}
	}

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

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

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