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 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 // Whitelisted AIDs are AID_ROOT and all AIDs in [1000, 2000)
47 if (event.GetUid() == AID_ROOT || (event.GetUid() >= 1000 && event.GetUid() < 2000) ||
48 mAllowedLogSources.find(event.GetUid()) != mAllowedLogSources.end()) {
49 if (mStateTrackers.find(event.GetTagId()) != mStateTrackers.end()) {
50 mStateTrackers[event.GetTagId()]->onLogEvent(event);
51 }
52 }
53 }
54
registerListener(const int32_t atomId,wp<StateListener> listener)55 void StateManager::registerListener(const int32_t atomId, wp<StateListener> listener) {
56 // Check if state tracker already exists.
57 if (mStateTrackers.find(atomId) == mStateTrackers.end()) {
58 mStateTrackers[atomId] = new StateTracker(atomId);
59 }
60 mStateTrackers[atomId]->registerListener(listener);
61 }
62
unregisterListener(const int32_t atomId,wp<StateListener> listener)63 void StateManager::unregisterListener(const int32_t atomId, wp<StateListener> listener) {
64 std::unique_lock<std::mutex> lock(mMutex);
65
66 // Hold the sp<> until the lock is released so that ~StateTracker() is
67 // not called while the lock is held.
68 sp<StateTracker> toRemove;
69
70 // Unregister listener from correct StateTracker
71 auto it = mStateTrackers.find(atomId);
72 if (it != mStateTrackers.end()) {
73 it->second->unregisterListener(listener);
74
75 // Remove the StateTracker if it has no listeners
76 if (it->second->getListenersCount() == 0) {
77 toRemove = it->second;
78 mStateTrackers.erase(it);
79 }
80 } else {
81 ALOGE("StateManager cannot unregister listener, StateTracker for atom %d does not exist",
82 atomId);
83 }
84 lock.unlock();
85 }
86
getStateValue(const int32_t atomId,const HashableDimensionKey & key,FieldValue * output) const87 bool StateManager::getStateValue(const int32_t atomId, const HashableDimensionKey& key,
88 FieldValue* output) const {
89 auto it = mStateTrackers.find(atomId);
90 if (it != mStateTrackers.end()) {
91 return it->second->getStateValue(key, output);
92 }
93 return false;
94 }
95
updateLogSources(const sp<UidMap> & uidMap)96 void StateManager::updateLogSources(const sp<UidMap>& uidMap) {
97 mAllowedLogSources.clear();
98 for (const auto& pkg : mAllowedPkg) {
99 auto uids = uidMap->getAppUid(pkg);
100 mAllowedLogSources.insert(uids.begin(), uids.end());
101 }
102 }
103
notifyAppChanged(const string & apk,const sp<UidMap> & uidMap)104 void StateManager::notifyAppChanged(const string& apk, const sp<UidMap>& uidMap) {
105 if (mAllowedPkg.find(apk) != mAllowedPkg.end()) {
106 updateLogSources(uidMap);
107 }
108 }
109
110 } // namespace statsd
111 } // namespace os
112 } // namespace android
113