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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 "mojo/shell/app_child_process.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "base/callback_helpers.h" | |
| 9 #include "base/files/file_path.h" | |
| 10 #include "base/location.h" | |
| 11 #include "base/logging.h" | |
| 12 #include "base/macros.h" | |
| 13 #include "base/memory/ref_counted.h" | |
| 14 #include "base/memory/scoped_ptr.h" | |
| 15 #include "base/message_loop/message_loop.h" | |
| 16 #include "base/scoped_native_library.h" | |
| 17 #include "base/single_thread_task_runner.h" | |
| 18 #include "base/synchronization/waitable_event.h" | |
| 19 #include "base/threading/thread.h" | |
| 20 #include "base/threading/thread_checker.h" | |
| 21 #include "mojo/common/message_pump_mojo.h" | |
| 22 #include "mojo/edk/embedder/embedder.h" | |
| 23 #include "mojo/edk/embedder/simple_platform_support.h" | |
| 24 #include "mojo/public/cpp/system/core.h" | |
| 25 #include "mojo/shell/app_child_process.mojom.h" | |
| 26 | |
| 27 namespace mojo { | |
| 28 namespace shell { | |
| 29 | |
| 30 namespace { | |
| 31 | |
| 32 // Blocker --------------------------------------------------------------------- | |
| 33 | |
| 34 // Blocks a thread until another thread unblocks it, at which point it unblocks | |
| 35 // and runs a closure provided by that thread. | |
| 36 class Blocker { | |
| 37 public: | |
| 38 class Unblocker { | |
| 39 public: | |
| 40 ~Unblocker() {} | |
| 41 | |
| 42 void Unblock(base::Closure run_after) { | |
| 43 DCHECK(blocker_); | |
| 44 DCHECK(blocker_->run_after_.is_null()); | |
| 45 blocker_->run_after_ = run_after; | |
| 46 blocker_->event_.Signal(); | |
| 47 blocker_ = NULL; | |
| 48 } | |
| 49 | |
| 50 private: | |
| 51 friend class Blocker; | |
| 52 Unblocker(Blocker* blocker) : blocker_(blocker) { | |
| 53 DCHECK(blocker_); | |
| 54 } | |
| 55 | |
| 56 Blocker* blocker_; | |
| 57 | |
| 58 // Copy and assign allowed. | |
| 59 }; | |
| 60 | |
| 61 Blocker() : event_(true, false) {} | |
| 62 ~Blocker() {} | |
| 63 | |
| 64 void Block() { | |
| 65 DCHECK(run_after_.is_null()); | |
| 66 event_.Wait(); | |
| 67 run_after_.Run(); | |
| 68 } | |
| 69 | |
| 70 Unblocker GetUnblocker() { | |
| 71 return Unblocker(this); | |
| 72 } | |
| 73 | |
| 74 private: | |
| 75 base::WaitableEvent event_; | |
| 76 base::Closure run_after_; | |
| 77 | |
| 78 DISALLOW_COPY_AND_ASSIGN(Blocker); | |
| 79 }; | |
| 80 | |
| 81 // AppContext ------------------------------------------------------------------ | |
| 82 | |
| 83 class AppChildControllerImpl; | |
| 84 | |
| 85 static void DestroyController(scoped_ptr<AppChildControllerImpl> controller) { | |
| 86 } | |
| 87 | |
| 88 // Should be created and initialized on the main thread. | |
| 89 class AppContext { | |
| 90 public: | |
| 91 AppContext() | |
| 92 : io_thread_("io_thread"), | |
| 93 controller_thread_("controller_thread") {} | |
| 94 ~AppContext() {} | |
| 95 | |
| 96 void Init() { | |
| 97 // Initialize Mojo before starting any threads. | |
| 98 embedder::Init(scoped_ptr<mojo::embedder::PlatformSupport>( | |
| 99 new mojo::embedder::SimplePlatformSupport())); | |
| 100 | |
| 101 // Create and start our I/O thread. | |
| 102 base::Thread::Options io_thread_options(base::MessageLoop::TYPE_IO, 0); | |
| 103 CHECK(io_thread_.StartWithOptions(io_thread_options)); | |
| 104 io_runner_ = io_thread_.message_loop_proxy().get(); | |
| 105 CHECK(io_runner_.get()); | |
| 106 | |
| 107 // Create and start our controller thread. | |
| 108 base::Thread::Options controller_thread_options; | |
| 109 controller_thread_options.message_loop_type = | |
| 110 base::MessageLoop::TYPE_CUSTOM; | |
| 111 controller_thread_options.message_pump_factory = | |
| 112 base::Bind(&common::MessagePumpMojo::Create); | |
| 113 CHECK(controller_thread_.StartWithOptions(controller_thread_options)); | |
| 114 controller_runner_ = controller_thread_.message_loop_proxy().get(); | |
| 115 CHECK(controller_runner_.get()); | |
| 116 } | |
| 117 | |
| 118 void Shutdown() { | |
| 119 controller_runner_->PostTask( | |
| 120 FROM_HERE, | |
| 121 base::Bind(&DestroyController, base::Passed(&controller_))); | |
| 122 } | |
| 123 | |
| 124 base::SingleThreadTaskRunner* io_runner() const { | |
| 125 return io_runner_.get(); | |
| 126 } | |
| 127 | |
| 128 base::SingleThreadTaskRunner* controller_runner() const { | |
| 129 return controller_runner_.get(); | |
| 130 } | |
| 131 | |
| 132 AppChildControllerImpl* controller() const { | |
| 133 return controller_.get(); | |
| 134 } | |
| 135 | |
| 136 void set_controller(scoped_ptr<AppChildControllerImpl> controller) { | |
| 137 controller_ = controller.Pass(); | |
| 138 } | |
| 139 | |
| 140 private: | |
| 141 // Accessed only on the controller thread. | |
| 142 // IMPORTANT: This must be BEFORE |controller_thread_|, so that the controller | |
| 143 // thread gets joined (and thus |controller_| reset) before |controller_| is | |
| 144 // destroyed. | |
| 145 scoped_ptr<AppChildControllerImpl> controller_; | |
| 146 | |
| 147 base::Thread io_thread_; | |
| 148 scoped_refptr<base::SingleThreadTaskRunner> io_runner_; | |
| 149 | |
| 150 base::Thread controller_thread_; | |
| 151 scoped_refptr<base::SingleThreadTaskRunner> controller_runner_; | |
| 152 | |
| 153 DISALLOW_COPY_AND_ASSIGN(AppContext); | |
| 154 }; | |
| 155 | |
| 156 // AppChildControllerImpl ------------------------------------------------------ | |
| 157 | |
| 158 class AppChildControllerImpl : public InterfaceImpl<AppChildController> { | |
| 159 public: | |
| 160 ~AppChildControllerImpl() override { | |
| 161 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 162 | |
| 163 // TODO(vtl): Pass in the result from |MainMain()|. | |
| 164 client()->AppCompleted(MOJO_RESULT_UNIMPLEMENTED); | |
| 165 } | |
| 166 | |
| 167 // To be executed on the controller thread. Creates the |AppChildController|, | |
| 168 // etc. | |
| 169 static void Init( | |
| 170 AppContext* app_context, | |
| 171 embedder::ScopedPlatformHandle platform_channel, | |
| 172 const Blocker::Unblocker& unblocker) { | |
| 173 DCHECK(app_context); | |
| 174 DCHECK(platform_channel.is_valid()); | |
| 175 | |
| 176 DCHECK(!app_context->controller()); | |
| 177 | |
| 178 scoped_ptr<AppChildControllerImpl> impl( | |
| 179 new AppChildControllerImpl(app_context, unblocker)); | |
| 180 | |
| 181 ScopedMessagePipeHandle host_message_pipe(embedder::CreateChannel( | |
| 182 platform_channel.Pass(), | |
| 183 app_context->io_runner(), | |
| 184 base::Bind(&AppChildControllerImpl::DidCreateChannel, | |
| 185 base::Unretained(impl.get())), | |
| 186 base::MessageLoopProxy::current())); | |
| 187 | |
| 188 BindToPipe(impl.get(), host_message_pipe.Pass()); | |
| 189 | |
| 190 app_context->set_controller(impl.Pass()); | |
| 191 } | |
| 192 | |
| 193 void OnConnectionError() override { | |
| 194 // TODO(darin): How should we handle a connection error here? | |
| 195 } | |
| 196 | |
| 197 // |AppChildController| methods: | |
| 198 void StartApp(const String& app_path, | |
| 199 ScopedMessagePipeHandle service) override { | |
| 200 DVLOG(2) << "AppChildControllerImpl::StartApp(" << app_path << ", ...)"; | |
| 201 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 202 | |
| 203 unblocker_.Unblock(base::Bind(&AppChildControllerImpl::StartAppOnMainThread, | |
| 204 base::FilePath::FromUTF8Unsafe(app_path), | |
| 205 base::Passed(&service))); | |
| 206 } | |
| 207 | |
| 208 private: | |
| 209 AppChildControllerImpl(AppContext* app_context, | |
| 210 const Blocker::Unblocker& unblocker) | |
| 211 : app_context_(app_context), | |
| 212 unblocker_(unblocker), | |
| 213 channel_info_(NULL) { | |
| 214 } | |
| 215 | |
| 216 // Callback for |embedder::CreateChannel()|. | |
| 217 void DidCreateChannel(embedder::ChannelInfo* channel_info) { | |
| 218 DVLOG(2) << "AppChildControllerImpl::DidCreateChannel()"; | |
| 219 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 220 channel_info_ = channel_info; | |
| 221 } | |
| 222 | |
| 223 static void StartAppOnMainThread(const base::FilePath& app_path, | |
| 224 ScopedMessagePipeHandle service) { | |
| 225 // TODO(vtl): This is copied from in_process_dynamic_service_runner.cc. | |
| 226 DVLOG(2) << "Loading/running Mojo app from " << app_path.value() | |
| 227 << " out of process"; | |
| 228 | |
| 229 do { | |
| 230 base::NativeLibraryLoadError load_error; | |
| 231 base::ScopedNativeLibrary app_library( | |
| 232 base::LoadNativeLibrary(app_path, &load_error)); | |
| 233 if (!app_library.is_valid()) { | |
| 234 LOG(ERROR) << "Failed to load library (error: " << load_error.ToString() | |
| 235 << ")"; | |
| 236 break; | |
| 237 } | |
| 238 | |
| 239 typedef MojoResult (*MojoMainFunction)(MojoHandle); | |
| 240 MojoMainFunction main_function = reinterpret_cast<MojoMainFunction>( | |
| 241 app_library.GetFunctionPointer("MojoMain")); | |
| 242 if (!main_function) { | |
| 243 LOG(ERROR) << "Entrypoint MojoMain not found"; | |
| 244 break; | |
| 245 } | |
| 246 | |
| 247 // TODO(vtl): Report the result back to our parent process. | |
| 248 // |MojoMain()| takes ownership of the service handle. | |
| 249 MojoResult result = main_function(service.release().value()); | |
| 250 if (result < MOJO_RESULT_OK) | |
| 251 LOG(ERROR) << "MojoMain returned an error: " << result; | |
| 252 } while (false); | |
| 253 } | |
| 254 | |
| 255 base::ThreadChecker thread_checker_; | |
| 256 AppContext* const app_context_; | |
| 257 Blocker::Unblocker unblocker_; | |
| 258 | |
| 259 embedder::ChannelInfo* channel_info_; | |
| 260 | |
| 261 DISALLOW_COPY_AND_ASSIGN(AppChildControllerImpl); | |
| 262 }; | |
| 263 | |
| 264 } // namespace | |
| 265 | |
| 266 // AppChildProcess ------------------------------------------------------------- | |
| 267 | |
| 268 AppChildProcess::AppChildProcess() { | |
| 269 } | |
| 270 | |
| 271 AppChildProcess::~AppChildProcess() { | |
| 272 } | |
| 273 | |
| 274 void AppChildProcess::Main() { | |
| 275 DVLOG(2) << "AppChildProcess::Main()"; | |
| 276 | |
| 277 AppContext app_context; | |
| 278 app_context.Init(); | |
| 279 | |
| 280 Blocker blocker; | |
| 281 app_context.controller_runner()->PostTask( | |
| 282 FROM_HERE, | |
| 283 base::Bind(&AppChildControllerImpl::Init, base::Unretained(&app_context), | |
| 284 base::Passed(platform_channel()), blocker.GetUnblocker())); | |
| 285 // This will block, then run whatever the controller wants. | |
| 286 blocker.Block(); | |
| 287 | |
| 288 app_context.Shutdown(); | |
| 289 } | |
| 290 | |
| 291 } // namespace shell | |
| 292 } // namespace mojo | |
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Chromium Code Reviews
Issue 687433002:
Remove mojo/shell and (most) service implementations (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master