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      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 #pragma once
     18 
     19 #include <android/os/IStatsCompanionService.h>
     20 #include <binder/IServiceManager.h>
     21 #include <utils/RefBase.h>
     22 #include <utils/threads.h>
     23 #include <string>
     24 #include <unordered_map>
     25 #include <vector>
     26 #include <list>
     27 #include "PullDataReceiver.h"
     28 #include "StatsPuller.h"
     29 #include "logd/LogEvent.h"
     30 
     31 namespace android {
     32 namespace os {
     33 namespace statsd {
     34 
     35 typedef struct {
     36   // The field numbers of the fields that need to be summed when merging
     37   // isolated uid with host uid.
     38   std::vector<int> additiveFields;
     39   // The field numbers of the fields that can't be merged when merging
     40   // data belong to isolated uid and host uid.
     41   std::vector<int> nonAdditiveFields;
     42   // How long should the puller wait before doing an actual pull again. Default
     43   // 1 sec. Set this to 0 if this is handled elsewhere.
     44   int64_t coolDownNs = 1 * NS_PER_SEC;
     45   // The actual puller
     46   sp<StatsPuller> puller;
     47 } PullAtomInfo;
     48 
     49 class StatsPullerManagerImpl : public virtual RefBase {
     50 public:
     51     static StatsPullerManagerImpl& GetInstance();
     52 
     53     void RegisterReceiver(int tagId, wp<PullDataReceiver> receiver, int64_t nextPullTimeNs,
     54                           int64_t intervalNs);
     55 
     56     void UnRegisterReceiver(int tagId, wp<PullDataReceiver> receiver);
     57 
     58     // Verify if we know how to pull for this matcher
     59     bool PullerForMatcherExists(int tagId) const;
     60 
     61     void OnAlarmFired(const int64_t timeNs);
     62 
     63     bool Pull(const int tagId, const int64_t timeNs, vector<std::shared_ptr<LogEvent>>* data);
     64 
     65     int ForceClearPullerCache();
     66 
     67     int ClearPullerCacheIfNecessary(int64_t timestampNs);
     68 
     69     void SetStatsCompanionService(sp<IStatsCompanionService> statsCompanionService);
     70 
     71     const static std::map<int, PullAtomInfo> kAllPullAtomInfo;
     72 
     73    private:
     74     StatsPullerManagerImpl();
     75 
     76     sp<IStatsCompanionService> mStatsCompanionService = nullptr;
     77 
     78     typedef struct {
     79         int64_t nextPullTimeNs;
     80         int64_t intervalNs;
     81         wp<PullDataReceiver> receiver;
     82     } ReceiverInfo;
     83 
     84     // mapping from simple matcher tagId to receivers
     85     std::map<int, std::list<ReceiverInfo>> mReceivers;
     86 
     87     // locks for data receiver and StatsCompanionService changes
     88     Mutex mLock;
     89 
     90     void updateAlarmLocked();
     91 
     92     int64_t mNextPullTimeNs;
     93 
     94     FRIEND_TEST(GaugeMetricE2eTest, TestRandomSamplePulledEvents);
     95     FRIEND_TEST(GaugeMetricE2eTest, TestRandomSamplePulledEvent_LateAlarm);
     96     FRIEND_TEST(ValueMetricE2eTest, TestPulledEvents);
     97     FRIEND_TEST(ValueMetricE2eTest, TestPulledEvents_LateAlarm);
     98 };
     99 
    100 }  // namespace statsd
    101 }  // namespace os
    102 }  // namespace android
    103