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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 #include "chre/core/nanoapp.h"
     18 
     19 #include "chre/core/event_loop_manager.h"
     20 #include "chre/platform/assert.h"
     21 #include "chre/platform/fatal_error.h"
     22 #include "chre/platform/log.h"
     23 #include "chre/util/system/debug_dump.h"
     24 
     25 namespace chre {
     26 
     27 bool Nanoapp::isRegisteredForBroadcastEvent(uint16_t eventType) const {
     28   return (mRegisteredEvents.find(eventType) != mRegisteredEvents.size());
     29 }
     30 
     31 bool Nanoapp::registerForBroadcastEvent(uint16_t eventId) {
     32   if (isRegisteredForBroadcastEvent(eventId)) {
     33     return false;
     34   }
     35 
     36   if (!mRegisteredEvents.push_back(eventId)) {
     37     FATAL_ERROR("App failed to register for event: out of memory");
     38   }
     39 
     40   return true;
     41 }
     42 
     43 bool Nanoapp::unregisterForBroadcastEvent(uint16_t eventId) {
     44   size_t registeredEventIndex = mRegisteredEvents.find(eventId);
     45   if (registeredEventIndex == mRegisteredEvents.size()) {
     46     return false;
     47   }
     48 
     49   mRegisteredEvents.erase(registeredEventIndex);
     50   return true;
     51 }
     52 
     53 void Nanoapp::postEvent(Event *event) {
     54   mEventQueue.push(event);
     55 }
     56 
     57 bool Nanoapp::hasPendingEvent() {
     58   return !mEventQueue.empty();
     59 }
     60 
     61 void Nanoapp::configureNanoappInfoEvents(bool enable) {
     62   bool success;
     63   if (enable) {
     64     success = registerForBroadcastEvent(CHRE_EVENT_NANOAPP_STARTED);
     65     success &= registerForBroadcastEvent(CHRE_EVENT_NANOAPP_STOPPED);
     66   } else {
     67     success = unregisterForBroadcastEvent(CHRE_EVENT_NANOAPP_STARTED);
     68     success &= unregisterForBroadcastEvent(CHRE_EVENT_NANOAPP_STOPPED);
     69   }
     70 
     71   if (!success) {
     72     // An app has failed to register for an event and may be stuck waiting for
     73     // an event that it will never receive. This is considered a fatal situation
     74     // as the nanoapp is stuck and there is no way to recover other than
     75     // unloading the nanoapp. This can happen in an OOM situation.
     76     FATAL_ERROR("Failed to configure nanoapp info events to %d", enable);
     77   }
     78 }
     79 
     80 Event *Nanoapp::processNextEvent() {
     81   Event *event = mEventQueue.pop();
     82 
     83   CHRE_ASSERT_LOG(event != nullptr, "Tried delivering event, but queue empty");
     84   if (event != nullptr) {
     85     handleEvent(event->senderInstanceId, event->eventType, event->eventData);
     86   }
     87 
     88   return event;
     89 }
     90 
     91 bool Nanoapp::logStateToBuffer(char *buffer, size_t *bufferPos,
     92                                size_t bufferSize) const {
     93   bool success = PlatformNanoapp::logStateToBuffer(buffer, bufferPos,
     94                                                    bufferSize);
     95   success &= debugDumpPrint(buffer, bufferPos, bufferSize,
     96                             " Id=%" PRIu32 " AppId=0x%016" PRIx64
     97                             " ver=0x%" PRIx32 " targetAPI=0x%" PRIx32 "\n",
     98                             getInstanceId(), getAppId(),
     99                             getAppVersion(), getTargetApiVersion());
    100   return success;
    101 }
    102 
    103 }  // namespace chre
    104