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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 for generateSessionId, err=%d", err);
     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             ALOGW("bad response from service for submit, err=%d", err);
     98             return MediaAnalyticsItem::SessionIDInvalid;
     99         }
    100 
    101         // get an answer out of 'reply'
    102         int64_t sessionid = reply.readInt64();
    103         if (DEBUGGING_RETURNS) {
    104             ALOGD("the caller gets sessionid=%" PRId64 "", sessionid);
    105         }
    106         return sessionid;
    107     }
    108 
    109 };
    110 
    111 IMPLEMENT_META_INTERFACE(MediaAnalyticsService, "android.media.IMediaAnalyticsService");
    112 
    113 // ----------------------------------------------------------------------
    114 
    115 status_t BnMediaAnalyticsService::onTransact(
    116     uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
    117 {
    118 
    119 
    120     // get calling pid/tid
    121     IPCThreadState *ipc = IPCThreadState::self();
    122     int clientPid = ipc->getCallingPid();
    123     // permission checking
    124 
    125     if(DEBUGGING_FLOW) {
    126         ALOGD("running in service, code %d, pid %d; called from pid %d",
    127             code, getpid(), clientPid);
    128     }
    129 
    130     switch (code) {
    131 
    132         case GENERATE_UNIQUE_SESSIONID: {
    133             CHECK_INTERFACE(IMediaAnalyticsService, data, reply);
    134 
    135             MediaAnalyticsItem::SessionID_t sessionid = generateUniqueSessionID();
    136             reply->writeInt64(sessionid);
    137 
    138             return NO_ERROR;
    139         } break;
    140 
    141         case SUBMIT_ITEM: {
    142             CHECK_INTERFACE(IMediaAnalyticsService, data, reply);
    143 
    144             bool forcenew;
    145             MediaAnalyticsItem *item = MediaAnalyticsItem::create();
    146 
    147             data.readBool(&forcenew);
    148             item->readFromParcel(data);
    149 
    150             item->setPid(clientPid);
    151 
    152             // submit() takes over ownership of 'item'
    153             MediaAnalyticsItem::SessionID_t sessionid = submit(item, forcenew);
    154             reply->writeInt64(sessionid);
    155 
    156             return NO_ERROR;
    157         } break;
    158 
    159         default:
    160             return BBinder::onTransact(code, data, reply, flags);
    161     }
    162 }
    163 
    164 // ----------------------------------------------------------------------------
    165 
    166 } // namespace android
    167