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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_hardware_automotive_vehicle_V2_0_impl_SocketComm_H_
     18 #define android_hardware_automotive_vehicle_V2_0_impl_SocketComm_H_
     19 
     20 #include <mutex>
     21 #include <vector>
     22 #include "CommBase.h"
     23 
     24 namespace android {
     25 namespace hardware {
     26 namespace automotive {
     27 namespace vehicle {
     28 namespace V2_0 {
     29 
     30 namespace impl {
     31 
     32 /**
     33  * SocketComm opens a socket via adb's TCP port forwarding to enable a Host PC to connect to
     34  * the VehicleHAL.
     35  */
     36 class SocketComm : public CommBase {
     37 public:
     38     SocketComm();
     39     virtual ~SocketComm();
     40 
     41     /**
     42      * Creates a connection to the other side.
     43      *
     44      * @return int Returns fd or socket number if connection is successful.
     45      *              Otherwise, returns -1 if no connection is availble.
     46      */
     47     int connect() override;
     48 
     49     /**
     50      * Opens a socket and begins listening.
     51      *
     52      * @return int Returns 0 on success.
     53      */
     54     int open() override;
     55 
     56     /**
     57      * Blocking call to read data from the connection.
     58      *
     59      * @return std::vector<uint8_t> Serialized protobuf data received from emulator.  This will be
     60      *              an empty vector if the connection was closed or some other error occurred.
     61      */
     62     std::vector<uint8_t> read() override;
     63 
     64     /**
     65      * Closes a connection if it is open.
     66      */
     67     void stop() override;
     68 
     69     /**
     70      * Transmits a string of data to the emulator.
     71      *
     72      * @param data Serialized protobuf data to transmit.
     73      *
     74      * @return int Number of bytes transmitted, or -1 if failed.
     75      */
     76     int write(const std::vector<uint8_t>& data) override;
     77 
     78 private:
     79     int mCurSockFd;
     80     std::atomic<int> mExit;
     81     std::mutex mMutex;
     82     int mSockFd;
     83 };
     84 
     85 }  // impl
     86 
     87 }  // namespace V2_0
     88 }  // namespace vehicle
     89 }  // namespace automotive
     90 }  // namespace hardware
     91 }  // namespace android
     92 
     93 
     94 #endif  // android_hardware_automotive_vehicle_V2_0_impl_SocketComm_H_
     95