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      1 /*
      2  * Copyright (C) 2016 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 LOG_TAG "MediaAnalytics"
     18 
     19 #include <stdint.h>
     20 #include <inttypes.h>
     21 #include <sys/types.h>
     22 
     23 #include <binder/Parcel.h>
     24 #include <binder/IMemory.h>
     25 #include <binder/IPCThreadState.h>
     26 
     27 #include <utils/Errors.h>  // for status_t
     28 #include <utils/List.h>
     29 #include <utils/Log.h>
     30 #include <utils/String8.h>
     31 
     32 #include <media/MediaAnalyticsItem.h>
     33 #include <media/IMediaAnalyticsService.h>
     34 
     35 #define DEBUGGING               0
     36 #define DEBUGGING_FLOW          0
     37 #define DEBUGGING_RETURNS       0
     38 
     39 namespace android {
     40 
     41 enum {
     42     GENERATE_UNIQUE_SESSIONID = IBinder::FIRST_CALL_TRANSACTION,
     43     SUBMIT_ITEM,
     44 };
     45 
     46 class BpMediaAnalyticsService: public BpInterface<IMediaAnalyticsService>
     47 {
     48 public:
     49     explicit BpMediaAnalyticsService(const sp<IBinder>& impl)
     50         : BpInterface<IMediaAnalyticsService>(impl)
     51     {
     52     }
     53 
     54     virtual MediaAnalyticsItem::SessionID_t generateUniqueSessionID() {
     55         Parcel data, reply;
     56         status_t err;
     57         MediaAnalyticsItem::SessionID_t sessionid =
     58                         MediaAnalyticsItem::SessionIDInvalid;
     59 
     60         data.writeInterfaceToken(IMediaAnalyticsService::getInterfaceDescriptor());
     61         err = remote()->transact(GENERATE_UNIQUE_SESSIONID, data, &reply);
     62         if (err != NO_ERROR) {
     63             ALOGW("bad response from service");
     64             return MediaAnalyticsItem::SessionIDInvalid;
     65         }
     66         sessionid = reply.readInt64();
     67         if (DEBUGGING_RETURNS) {
     68             ALOGD("the caller gets a sessionid of %" PRId64 " back", sessionid);
     69         }
     70         return sessionid;
     71     }
     72 
     73     virtual MediaAnalyticsItem::SessionID_t submit(MediaAnalyticsItem *item, bool forcenew)
     74     {
     75         // have this record submit itself
     76         // this will be a binder call with appropriate timing
     77         // return value is the uuid that the system generated for it.
     78         // the return value 0 and -1 are reserved.
     79         // -1 to indicate that there was a problem recording...
     80 
     81         Parcel data, reply;
     82         status_t err;
     83 
     84         if (item == NULL) {
     85                 return MediaAnalyticsItem::SessionIDInvalid;
     86         }
     87 
     88         data.writeInterfaceToken(IMediaAnalyticsService::getInterfaceDescriptor());
     89         if(DEBUGGING_FLOW) {
     90             ALOGD("client offers record: %s", item->toString().c_str());
     91         }
     92         data.writeBool(forcenew);
     93         item->writeToParcel(&data);
     94 
     95         err = remote()->transact(SUBMIT_ITEM, data, &reply);
     96         if (err != NO_ERROR) {
     97             return MediaAnalyticsItem::SessionIDInvalid;
     98         }
     99 
    100         // get an answer out of 'reply'
    101         int64_t sessionid = reply.readInt64();
    102         if (DEBUGGING_RETURNS) {
    103             ALOGD("the caller gets sessionid=%" PRId64 "", sessionid);
    104         }
    105         return sessionid;
    106     }
    107 
    108 };
    109 
    110 IMPLEMENT_META_INTERFACE(MediaAnalyticsService, "android.media.IMediaAnalyticsService");
    111 
    112 // ----------------------------------------------------------------------
    113 
    114 status_t BnMediaAnalyticsService::onTransact(
    115     uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
    116 {
    117 
    118 
    119     // get calling pid/tid
    120     IPCThreadState *ipc = IPCThreadState::self();
    121     int clientPid = ipc->getCallingPid();
    122     // permission checking
    123 
    124     if(DEBUGGING_FLOW) {
    125         ALOGD("running in service, code %d, pid %d; called from pid %d",
    126             code, getpid(), clientPid);
    127     }
    128 
    129     switch (code) {
    130 
    131         case GENERATE_UNIQUE_SESSIONID: {
    132             CHECK_INTERFACE(IMediaAnalyticsService, data, reply);
    133 
    134             MediaAnalyticsItem::SessionID_t sessionid = generateUniqueSessionID();
    135             reply->writeInt64(sessionid);
    136 
    137             return NO_ERROR;
    138         } break;
    139 
    140         case SUBMIT_ITEM: {
    141             CHECK_INTERFACE(IMediaAnalyticsService, data, reply);
    142 
    143             bool forcenew;
    144             MediaAnalyticsItem *item = new MediaAnalyticsItem;
    145 
    146             data.readBool(&forcenew);
    147             item->readFromParcel(data);
    148 
    149             item->setPid(clientPid);
    150 
    151             // submit() takes over ownership of 'item'
    152             MediaAnalyticsItem::SessionID_t sessionid = submit(item, forcenew);
    153             reply->writeInt64(sessionid);
    154 
    155             return NO_ERROR;
    156         } break;
    157 
    158         default:
    159             return BBinder::onTransact(code, data, reply, flags);
    160     }
    161 }
    162 
    163 // ----------------------------------------------------------------------------
    164 
    165 } // namespace android
    166