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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 #ifndef ANDROID_SENSORHAL_EXT_CONNECTION_DETECTOR_H
     18 #define ANDROID_SENSORHAL_EXT_CONNECTION_DETECTOR_H
     19 
     20 #include "BaseDynamicSensorDaemon.h"
     21 #include <utils/Thread.h>
     22 #include <utils/Looper.h>
     23 
     24 #include <regex>
     25 
     26 #include <poll.h>
     27 
     28 namespace android {
     29 namespace SensorHalExt {
     30 
     31 // Abstraction of connection detector: an entity that calls
     32 // BaseDynamicSensorDaemon::onConnectionChange() when necessary.
     33 class ConnectionDetector : virtual public RefBase {
     34 public:
     35     ConnectionDetector(BaseDynamicSensorDaemon *d) : mDaemon(d) { }
     36     virtual ~ConnectionDetector() = default;
     37 protected:
     38     BaseDynamicSensorDaemon* mDaemon;
     39 };
     40 
     41 // Open a socket that listen to localhost:port and notify sensor daemon of connection and
     42 // disconnection event when socket is connected or disconnected, respectively. Only one concurrent
     43 // client is accepted.
     44 class SocketConnectionDetector : public ConnectionDetector, public Thread {
     45 public:
     46     SocketConnectionDetector(BaseDynamicSensorDaemon *d, int port);
     47     virtual ~SocketConnectionDetector();
     48 private:
     49     // implement virtual of Thread
     50     virtual bool threadLoop();
     51     int waitForConnection();
     52     static void waitForDisconnection(int connFd);
     53 
     54     int mListenFd;
     55     std::string mDevice;
     56 };
     57 
     58 // Detect file change under path and notify sensor daemon of connection and disconnection event when
     59 // file is created in or removed from the directory, respectively.
     60 class FileConnectionDetector : public ConnectionDetector, public Thread {
     61 public:
     62     FileConnectionDetector(
     63             BaseDynamicSensorDaemon *d, const std::string &path, const std::string &regex);
     64     virtual ~FileConnectionDetector();
     65 private:
     66     static constexpr int POLL_IDENT = 1;
     67     // implement virtual of Thread
     68     virtual bool threadLoop();
     69 
     70     bool matches(const std::string &name) const;
     71     void processExistingFiles() const;
     72     void handleInotifyData(ssize_t len, const char *data);
     73     bool readInotifyData();
     74     std::string getFullName(const std::string name) const;
     75 
     76     std::string mPath;
     77     std::regex mRegex;
     78     sp<Looper> mLooper;
     79     int mInotifyFd;
     80 };
     81 
     82 } // namespace SensorHalExt
     83 } // namespace android
     84 
     85 #endif // ANDROID_SENSORHAL_EXT_DYNAMIC_SENSOR_DAEMON_H
     86