1 /*
2 * Copyright (C) 2019, 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 STATSD_DEBUG false // STOPSHIP if true
18 #include "Log.h"
19
20 #include "StateManager.h"
21
22 #include <private/android_filesystem_config.h>
23
24 namespace android {
25 namespace os {
26 namespace statsd {
27
StateManager()28 StateManager::StateManager()
29 : mAllowedPkg({
30 "com.android.systemui",
31 }) {
32 }
33
getInstance()34 StateManager& StateManager::getInstance() {
35 static StateManager sStateManager;
36 return sStateManager;
37 }
38
clear()39 void StateManager::clear() {
40 mStateTrackers.clear();
41 }
42
onLogEvent(const LogEvent & event)43 void StateManager::onLogEvent(const LogEvent& event) {
44 // Only process state events from uids in AID_* and packages that are whitelisted in
45 // mAllowedPkg.
46 // Allowlisted AIDs are AID_ROOT and all AIDs in [1000, 2000) which is [AID_SYSTEM, AID_SHELL)
47 if (event.GetUid() == AID_ROOT ||
48 (event.GetUid() >= AID_SYSTEM && event.GetUid() < AID_SHELL) ||
49 mAllowedLogSources.find(event.GetUid()) != mAllowedLogSources.end()) {
50 if (mStateTrackers.find(event.GetTagId()) != mStateTrackers.end()) {
51 mStateTrackers[event.GetTagId()]->onLogEvent(event);
52 }
53 }
54 }
55
registerListener(const int32_t atomId,const wp<StateListener> & listener)56 void StateManager::registerListener(const int32_t atomId, const wp<StateListener>& listener) {
57 // Check if state tracker already exists.
58 if (mStateTrackers.find(atomId) == mStateTrackers.end()) {
59 mStateTrackers[atomId] = new StateTracker(atomId);
60 }
61 mStateTrackers[atomId]->registerListener(listener);
62 }
63
unregisterListener(const int32_t atomId,const wp<StateListener> & listener)64 void StateManager::unregisterListener(const int32_t atomId, const wp<StateListener>& listener) {
65 std::unique_lock<std::mutex> lock(mMutex);
66
67 // Hold the sp<> until the lock is released so that ~StateTracker() is
68 // not called while the lock is held.
69 sp<StateTracker> toRemove;
70
71 // Unregister listener from correct StateTracker
72 auto it = mStateTrackers.find(atomId);
73 if (it != mStateTrackers.end()) {
74 it->second->unregisterListener(listener);
75
76 // Remove the StateTracker if it has no listeners
77 if (it->second->getListenersCount() == 0) {
78 toRemove = it->second;
79 mStateTrackers.erase(it);
80 }
81 } else {
82 ALOGE("StateManager cannot unregister listener, StateTracker for atom %d does not exist",
83 atomId);
84 }
85 lock.unlock();
86 }
87
getStateValue(const int32_t atomId,const HashableDimensionKey & key,FieldValue * output) const88 bool StateManager::getStateValue(const int32_t atomId, const HashableDimensionKey& key,
89 FieldValue* output) const {
90 auto it = mStateTrackers.find(atomId);
91 if (it != mStateTrackers.end()) {
92 return it->second->getStateValue(key, output);
93 }
94 ALOGE("StateManager cannot get state value, no StateTracker for atom %d", atomId);
95 return false;
96 }
97
updateLogSources(const sp<UidMap> & uidMap)98 void StateManager::updateLogSources(const sp<UidMap>& uidMap) {
99 mAllowedLogSources.clear();
100 for (const auto& pkg : mAllowedPkg) {
101 auto uids = uidMap->getAppUid(pkg);
102 mAllowedLogSources.insert(uids.begin(), uids.end());
103 }
104 }
105
notifyAppChanged(const string & apk,const sp<UidMap> & uidMap)106 void StateManager::notifyAppChanged(const string& apk, const sp<UidMap>& uidMap) {
107 if (mAllowedPkg.find(apk) != mAllowedPkg.end()) {
108 updateLogSources(uidMap);
109 }
110 }
111
addAllAtomIds(LogEventFilter::AtomIdSet & allIds) const112 void StateManager::addAllAtomIds(LogEventFilter::AtomIdSet& allIds) const {
113 for (const auto& stateTracker : mStateTrackers) {
114 allIds.insert(stateTracker.first);
115 }
116 }
117
118 } // namespace statsd
119 } // namespace os
120 } // namespace android
121