Bookatz | 857aaa5 | 2017-12-19 15:29:06 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2017 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #define DEBUG true // STOPSHIP if true |
| 18 | #include "Log.h" |
| 19 | |
| 20 | #include "DurationAnomalyTracker.h" |
| 21 | #include "guardrail/StatsdStats.h" |
| 22 | |
| 23 | namespace android { |
| 24 | namespace os { |
| 25 | namespace statsd { |
| 26 | |
| 27 | DurationAnomalyTracker::DurationAnomalyTracker(const Alert& alert, const ConfigKey& configKey) |
| 28 | : AnomalyTracker(alert, configKey) { |
| 29 | } |
| 30 | |
| 31 | DurationAnomalyTracker::~DurationAnomalyTracker() { |
| 32 | stopAllAlarms(); |
| 33 | } |
| 34 | |
| 35 | void DurationAnomalyTracker::resetStorage() { |
| 36 | AnomalyTracker::resetStorage(); |
| 37 | if (!mAlarms.empty()) VLOG("AnomalyTracker.resetStorage() called but mAlarms is NOT empty!"); |
| 38 | } |
| 39 | |
| 40 | void DurationAnomalyTracker::declareAnomalyIfAlarmExpired(const HashableDimensionKey& dimensionKey, |
| 41 | const uint64_t& timestampNs) { |
| 42 | auto itr = mAlarms.find(dimensionKey); |
| 43 | if (itr == mAlarms.end()) { |
| 44 | return; |
| 45 | } |
| 46 | |
| 47 | if (itr->second != nullptr && |
| 48 | static_cast<uint32_t>(timestampNs / NS_PER_SEC) >= itr->second->timestampSec) { |
| 49 | declareAnomaly(timestampNs); |
| 50 | stopAlarm(dimensionKey); |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | void DurationAnomalyTracker::startAlarm(const HashableDimensionKey& dimensionKey, |
| 55 | const uint64_t& timestampNs) { |
| 56 | |
| 57 | uint32_t timestampSec = static_cast<uint32_t>(timestampNs / NS_PER_SEC); |
| 58 | if (isInRefractoryPeriod(timestampNs)) { |
| 59 | VLOG("Skipping setting anomaly alarm since it'd fall in the refractory period"); |
| 60 | return; |
| 61 | } |
| 62 | sp<const AnomalyAlarm> alarm = new AnomalyAlarm{timestampSec}; |
| 63 | mAlarms.insert({dimensionKey, alarm}); |
| 64 | if (mAnomalyMonitor != nullptr) { |
| 65 | mAnomalyMonitor->add(alarm); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | void DurationAnomalyTracker::stopAlarm(const HashableDimensionKey& dimensionKey) { |
| 70 | auto itr = mAlarms.find(dimensionKey); |
| 71 | if (itr != mAlarms.end()) { |
| 72 | mAlarms.erase(dimensionKey); |
| 73 | if (mAnomalyMonitor != nullptr) { |
| 74 | mAnomalyMonitor->remove(itr->second); |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | void DurationAnomalyTracker::stopAllAlarms() { |
| 80 | std::set<HashableDimensionKey> keys; |
| 81 | for (auto itr = mAlarms.begin(); itr != mAlarms.end(); ++itr) { |
| 82 | keys.insert(itr->first); |
| 83 | } |
| 84 | for (auto key : keys) { |
| 85 | stopAlarm(key); |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | void DurationAnomalyTracker::informAlarmsFired(const uint64_t& timestampNs, |
| 90 | unordered_set<sp<const AnomalyAlarm>, SpHash<AnomalyAlarm>>& firedAlarms) { |
| 91 | |
| 92 | if (firedAlarms.empty() || mAlarms.empty()) return; |
| 93 | // Find the intersection of firedAlarms and mAlarms. |
| 94 | // The for loop is inefficient, since it loops over all keys, but that's okay since it is very |
| 95 | // seldomly called. The alternative would be having AnomalyAlarms store information about the |
| 96 | // DurationAnomalyTracker and key, but that's a lot of data overhead to speed up something that is |
| 97 | // rarely ever called. |
| 98 | unordered_map<HashableDimensionKey, sp<const AnomalyAlarm>> matchedAlarms; |
| 99 | for (const auto& kv : mAlarms) { |
| 100 | if (firedAlarms.count(kv.second) > 0) { |
| 101 | matchedAlarms.insert({kv.first, kv.second}); |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | // Now declare each of these alarms to have fired. |
| 106 | for (const auto& kv : matchedAlarms) { |
| 107 | declareAnomaly(timestampNs /* TODO: , kv.first */); |
| 108 | mAlarms.erase(kv.first); |
| 109 | firedAlarms.erase(kv.second); // No one else can also own it, so we're done with it. |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | } // namespace statsd |
| 114 | } // namespace os |
| 115 | } // namespace android |