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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "athena/system/device_socket_listener.h" | |
| 6 | |
| 7 #include <errno.h> | |
| 8 #include <map> | |
| 9 #include <sys/socket.h> | |
| 10 #include <sys/types.h> | |
| 11 #include <vector> | |
| 12 | |
| 13 #include "base/bind.h" | |
| 14 #include "base/files/file_path.h" | |
| 15 #include "base/memory/singleton.h" | |
| 16 #include "base/message_loop/message_loop.h" | |
| 17 #include "base/observer_list.h" | |
| 18 #include "base/stl_util.h" | |
| 19 #include "ipc/unix_domain_socket_util.h" | |
| 20 | |
| 21 namespace athena { | |
| 22 | |
| 23 namespace { | |
| 24 | |
| 25 typedef ObserverList<DeviceSocketListener> DeviceSocketListeners; | |
| 26 | |
| 27 // Reads from a device socket blocks of a particular size. When that amount of | |
| 28 // data is read DeviceSocketManager::OnDataAvailable is called on the singleton | |
| 29 // instance which then informs all of the listeners on that socket. | |
| 30 class DeviceSocketReader : public base::MessagePumpLibevent::Watcher { | |
| 31 public: | |
| 32 DeviceSocketReader(const std::string& socket_path, | |
| 33 size_t data_size) | |
| 34 : socket_path_(socket_path), | |
| 35 data_size_(data_size), | |
| 36 data_(new char[data_size]) { | |
| 37 } | |
| 38 virtual ~DeviceSocketReader() {} | |
| 39 | |
| 40 private: | |
| 41 // Overidden from base::MessagePumpLibevent::Watcher. | |
| 42 virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE; | |
| 43 virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE; | |
| 44 | |
| 45 std::string socket_path_; | |
| 46 size_t data_size_; | |
| 47 scoped_ptr<char[]> data_; | |
| 48 | |
| 49 DISALLOW_COPY_AND_ASSIGN(DeviceSocketReader); | |
| 50 }; | |
| 51 | |
| 52 class DeviceSocketManager; | |
| 53 DeviceSocketManager* device_socket_manager_instance_ = NULL; | |
| 54 | |
| 55 // A singleton instance for managing all connections to sockets. | |
| 56 class DeviceSocketManager { | |
| 57 public: | |
| 58 static void Create(scoped_refptr<base::TaskRunner> io_task_runner) { | |
| 59 device_socket_manager_instance_ = | |
| 60 new DeviceSocketManager(io_task_runner); | |
| 61 } | |
| 62 | |
| 63 static void Shutdown() { | |
| 64 CHECK(device_socket_manager_instance_); | |
| 65 delete device_socket_manager_instance_; | |
| 66 device_socket_manager_instance_ = NULL; | |
| 67 } | |
| 68 | |
| 69 static DeviceSocketManager* GetInstance() { | |
| 70 CHECK(device_socket_manager_instance_); | |
| 71 return device_socket_manager_instance_; | |
| 72 } | |
| 73 | |
| 74 // If there isn't an existing connection to |socket_path|, then opens a | |
| 75 // connection to |socket_path| and starts listening for data. All listeners | |
| 76 // for |socket_path| receives data when data is available on the socket. | |
| 77 void StartListening(const std::string& socket_path, | |
| 78 size_t data_size, | |
| 79 DeviceSocketListener* listener); | |
| 80 | |
| 81 // Removes |listener| from the list of listeners that receive data from | |
| 82 // |socket_path|. If this is the last listener, then this closes the | |
| 83 // connection to the socket. | |
| 84 void StopListening(const std::string& socket_path, | |
| 85 DeviceSocketListener* listener); | |
| 86 | |
| 87 // Sends data to all the listeners registered to receive data from | |
| 88 // |socket_path|. | |
| 89 void OnDataAvailable(const std::string& socket_path, | |
| 90 const void* data); | |
| 91 | |
| 92 // Notifies listeners of errors reading from the socket and closes it. | |
| 93 void OnError(const std::string& socket_path, int err); | |
| 94 void OnEOF(const std::string& socket_path); | |
| 95 | |
| 96 private: | |
| 97 friend struct DefaultSingletonTraits<DeviceSocketManager>; | |
| 98 | |
| 99 struct SocketData { | |
| 100 SocketData() | |
| 101 : fd(-1) { | |
| 102 } | |
| 103 | |
| 104 int fd; | |
| 105 DeviceSocketListeners observers; | |
| 106 scoped_ptr<base::MessagePumpLibevent::FileDescriptorWatcher> controller; | |
| 107 scoped_ptr<DeviceSocketReader> watcher; | |
| 108 }; | |
| 109 | |
| 110 DeviceSocketManager(scoped_refptr<base::TaskRunner> io_task_runner) | |
| 111 : io_task_runner_(io_task_runner) { | |
| 112 } | |
| 113 | |
| 114 ~DeviceSocketManager() { | |
| 115 STLDeleteContainerPairSecondPointers(socket_data_.begin(), | |
| 116 socket_data_.end()); | |
| 117 } | |
| 118 | |
| 119 void StartListeningOnIO(const std::string& socket_path, | |
| 120 size_t data_size, | |
| 121 DeviceSocketListener* listener); | |
| 122 | |
| 123 void StopListeningOnIO(const std::string& socket_path, | |
| 124 DeviceSocketListener* listener); | |
| 125 | |
| 126 void CloseSocket(const std::string& socket_path); | |
| 127 | |
| 128 std::map<std::string, SocketData*> socket_data_; | |
| 129 scoped_refptr<base::TaskRunner> io_task_runner_; | |
| 130 | |
| 131 DISALLOW_COPY_AND_ASSIGN(DeviceSocketManager); | |
| 132 }; | |
| 133 | |
| 134 //////////////////////////////////////////////////////////////////////////////// | |
| 135 // DeviceSocketReader | |
| 136 | |
| 137 void DeviceSocketReader::OnFileCanReadWithoutBlocking(int fd) { | |
| 138 ssize_t read_size = recv(fd, data_.get(), data_size_, 0); | |
| 139 if (read_size < 0) { | |
| 140 if (errno == EINTR) | |
| 141 return; | |
| 142 DeviceSocketManager::GetInstance()->OnError(socket_path_, errno); | |
| 143 return; | |
| 144 } | |
| 145 if (read_size == 0) { | |
| 146 DeviceSocketManager::GetInstance()->OnEOF(socket_path_); | |
| 147 return; | |
| 148 } | |
| 149 if (read_size != static_cast<ssize_t>(data_size_)) | |
| 150 return; | |
| 151 DeviceSocketManager::GetInstance()->OnDataAvailable(socket_path_, | |
| 152 data_.get()); | |
| 153 } | |
| 154 | |
| 155 void DeviceSocketReader::OnFileCanWriteWithoutBlocking(int fd) { | |
| 156 NOTREACHED(); | |
| 157 } | |
| 158 | |
| 159 //////////////////////////////////////////////////////////////////////////////// | |
| 160 // DeviceSocketManager | |
| 161 | |
| 162 void DeviceSocketManager::StartListening(const std::string& socket_path, | |
| 163 size_t data_size, | |
| 164 DeviceSocketListener* listener) { | |
| 165 io_task_runner_->PostTask(FROM_HERE, | |
| 166 base::Bind(&DeviceSocketManager::StartListeningOnIO, | |
| 167 base::Unretained(this), socket_path, data_size, listener)); | |
| 168 } | |
| 169 | |
| 170 void DeviceSocketManager::StopListening(const std::string& socket_path, | |
| 171 DeviceSocketListener* listener) { | |
| 172 io_task_runner_->PostTask(FROM_HERE, | |
| 173 base::Bind(&DeviceSocketManager::StopListeningOnIO, | |
| 174 base::Unretained(this), socket_path, listener)); | |
| 175 } | |
| 176 | |
| 177 void DeviceSocketManager::OnDataAvailable(const std::string& socket_path, | |
| 178 const void* data) { | |
| 179 CHECK_GT(socket_data_.count(socket_path), 0UL); | |
| 180 DeviceSocketListeners& listeners = socket_data_[socket_path]->observers; | |
| 181 FOR_EACH_OBSERVER(DeviceSocketListener, listeners, OnDataAvailableOnIO(data)); | |
| 182 } | |
| 183 | |
| 184 void DeviceSocketManager::CloseSocket(const std::string& socket_path) { | |
| 185 if (!socket_data_.count(socket_path)) | |
| 186 return; | |
| 187 SocketData* socket_data = socket_data_[socket_path]; | |
| 188 close(socket_data->fd); | |
| 189 delete socket_data; | |
| 190 socket_data_.erase(socket_path); | |
| 191 } | |
| 192 | |
| 193 void DeviceSocketManager::OnError(const std::string& socket_path, int err) { | |
| 194 LOG(ERROR) << "Error reading from socket: " << socket_path << ": " | |
| 195 << strerror(err); | |
| 196 CloseSocket(socket_path); | |
| 197 // TODO(flackr): Notify listeners that the socket was closed unexpectedly. | |
| 198 } | |
| 199 | |
| 200 void DeviceSocketManager::OnEOF(const std::string& socket_path) { | |
| 201 LOG(ERROR) << "EOF reading from socket: " << socket_path; | |
| 202 CloseSocket(socket_path); | |
| 203 } | |
| 204 | |
| 205 void DeviceSocketManager::StartListeningOnIO(const std::string& socket_path, | |
| 206 size_t data_size, | |
| 207 DeviceSocketListener* listener) { | |
| 208 CHECK(io_task_runner_->RunsTasksOnCurrentThread()); | |
| 209 SocketData* socket_data = NULL; | |
| 210 if (!socket_data_.count(socket_path)) { | |
| 211 int socket_fd = -1; | |
| 212 if (!IPC::CreateClientUnixDomainSocket(base::FilePath(socket_path), | |
| 213 &socket_fd)) { | |
| 214 LOG(ERROR) << "Error connecting to socket: " << socket_path; | |
| 215 return; | |
| 216 } | |
| 217 | |
| 218 socket_data = new SocketData; | |
| 219 socket_data_[socket_path] = socket_data; | |
| 220 | |
| 221 socket_data->fd = socket_fd; | |
| 222 | |
| 223 socket_data->controller.reset( | |
| 224 new base::MessagePumpLibevent::FileDescriptorWatcher()); | |
| 225 socket_data->watcher.reset( | |
| 226 new DeviceSocketReader(socket_path, data_size)); | |
| 227 | |
| 228 base::MessageLoopForIO::current()->WatchFileDescriptor( | |
| 229 socket_fd, | |
| 230 true, | |
| 231 base::MessageLoopForIO::WATCH_READ, | |
| 232 socket_data->controller.get(), | |
| 233 socket_data->watcher.get()); | |
| 234 } else { | |
| 235 socket_data = socket_data_[socket_path]; | |
| 236 } | |
| 237 socket_data->observers.AddObserver(listener); | |
| 238 } | |
| 239 | |
| 240 void DeviceSocketManager::StopListeningOnIO(const std::string& socket_path, | |
| 241 DeviceSocketListener* listener) { | |
| 242 if (!socket_data_.count(socket_path)) | |
| 243 return; // Happens if unable to create a socket. | |
| 244 | |
| 245 CHECK(io_task_runner_->RunsTasksOnCurrentThread()); | |
| 246 DeviceSocketListeners& listeners = socket_data_[socket_path]->observers; | |
| 247 listeners.RemoveObserver(listener); | |
| 248 if (!listeners.might_have_observers()) { | |
| 249 // All listeners for this socket has been removed. Close the socket. | |
| 250 CloseSocket(socket_path); | |
| 251 } | |
| 252 } | |
| 253 | |
| 254 } // namespace | |
| 255 | |
| 256 DeviceSocketListener::DeviceSocketListener(const std::string& socket_path, | |
| 257 size_t data_size) | |
| 258 : socket_path_(socket_path), | |
| 259 data_size_(data_size) { | |
| 260 } | |
| 261 | |
| 262 DeviceSocketListener::~DeviceSocketListener() { | |
| 263 StopListening(); | |
| 264 } | |
| 265 | |
| 266 // static | |
| 267 void DeviceSocketListener::CreateSocketManager( | |
| 268 scoped_refptr<base::TaskRunner> io_task_runner) { | |
| 269 DeviceSocketManager::Create(io_task_runner); | |
| 270 } | |
| 271 | |
| 272 // static | |
| 273 void DeviceSocketListener::ShutdownSocketManager() { | |
| 274 DeviceSocketManager::Shutdown(); | |
| 275 } | |
| 276 | |
| 277 void DeviceSocketListener::StartListening() { | |
| 278 DeviceSocketManager::GetInstance()->StartListening(socket_path_, | |
| 279 data_size_, | |
| 280 this); | |
| 281 } | |
| 282 | |
| 283 void DeviceSocketListener::StopListening() { | |
| 284 DeviceSocketManager::GetInstance()->StopListening(socket_path_, this); | |
| 285 } | |
| 286 | |
| 287 } // namespace athena | |
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Issue 475533008:
Revert of Rotate screen in response to accelerator or device orientation sensors. (Closed)
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