mojo/shell/android/main.cc

   1 // Copyright 2013 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/android/main.h"
   6
   7 #include "base/android/fifo_utils.h"
   8 #include "base/android/jni_android.h"
   9 #include "base/android/jni_array.h"
  10 #include "base/android/jni_string.h"
  11 #include "base/at_exit.h"
  12 #include "base/bind.h"
  13 #include "base/command_line.h"
  14 #include "base/files/file_path.h"
  15 #include "base/files/file_util.h"
  16 #include "base/lazy_instance.h"
  17 #include "base/logging.h"
  18 #include "base/macros.h"
  19 #include "base/message_loop/message_loop.h"
  20 #include "base/run_loop.h"
  21 #include "base/threading/simple_thread.h"
  22 #include "jni/ShellMain_jni.h"
  23 #include "mojo/common/message_pump_mojo.h"
  24 #include "mojo/shell/android/android_handler_loader.h"
  25 #include "mojo/shell/android/background_application_loader.h"
  26 #include "mojo/shell/android/native_viewport_application_loader.h"
  27 #include "mojo/shell/android/ui_application_loader_android.h"
  28 #include "mojo/shell/application_manager/application_loader.h"
  29 #include "mojo/shell/context.h"
  30 #include "mojo/shell/init.h"
  31 #include "ui/gl/gl_surface_egl.h"
  32
  33 using base::LazyInstance;
  34
  35 namespace mojo {
  36 namespace shell {
  37
  38 namespace {
  39
  40 // Tag for logging.
  41 const char kLogTag[] = "chromium";
  42
  43 // Command line argument for the communication fifo.
  44 const char kFifoPath[] = "fifo-path";
  45
  46 class MojoShellRunner : public base::DelegateSimpleThread::Delegate {
  47  public:
  48   MojoShellRunner(const std::vector<std::string>& parameters) {}
  49   ~MojoShellRunner() override {}
  50
  51  private:
  52   void Run() override;
  53
  54   DISALLOW_COPY_AND_ASSIGN(MojoShellRunner);
  55 };
  56
  57 LazyInstance<scoped_ptr<base::MessageLoop>> g_java_message_loop =
  58     LAZY_INSTANCE_INITIALIZER;
  59
  60 LazyInstance<scoped_ptr<Context>> g_context = LAZY_INSTANCE_INITIALIZER;
  61
  62 LazyInstance<scoped_ptr<MojoShellRunner>> g_shell_runner =
  63     LAZY_INSTANCE_INITIALIZER;
  64
  65 LazyInstance<scoped_ptr<base::DelegateSimpleThread>> g_shell_thread =
  66     LAZY_INSTANCE_INITIALIZER;
  67
  68 LazyInstance<base::android::ScopedJavaGlobalRef<jobject>> g_main_activiy =
  69     LAZY_INSTANCE_INITIALIZER;
  70
  71 void ConfigureAndroidServices(Context* context) {
  72   context->application_manager()->SetLoaderForURL(
  73       make_scoped_ptr(new UIApplicationLoader(
  74           make_scoped_ptr(new NativeViewportApplicationLoader()),
  75           g_java_message_loop.Get().get())),
  76       GURL("mojo:native_viewport_service"));
  77
  78   // Android handler is bundled with the Mojo shell, because it uses the
  79   // MojoShell application as the JNI bridge to bootstrap execution of other
  80   // Android Mojo apps that need JNI.
  81   context->application_manager()->SetLoaderForURL(
  82       make_scoped_ptr(new BackgroundApplicationLoader(
  83           make_scoped_ptr(new AndroidHandlerLoader()), "android_handler",
  84           base::MessageLoop::TYPE_DEFAULT)),
  85       GURL("mojo:android_handler"));
  86 }
  87
  88 void QuitShellThread() {
  89   g_shell_thread.Get()->Join();
  90   g_shell_thread.Pointer()->reset();
  91   Java_ShellMain_finishActivity(base::android::AttachCurrentThread(),
  92                                 g_main_activiy.Get().obj());
  93   exit(0);
  94 }
  95
  96 void MojoShellRunner::Run() {
  97   base::MessageLoop loop(common::MessagePumpMojo::Create());
  98   Context* context = g_context.Pointer()->get();
  99   ConfigureAndroidServices(context);
 100   context->Init();
 101
 102   context->Run(GURL("mojo:window_manager"));
 103   loop.Run();
 104
 105   g_java_message_loop.Pointer()->get()->PostTask(FROM_HERE,
 106                                                  base::Bind(&QuitShellThread));
 107 }
 108
 109 // Initialize stdout redirection if the command line switch is present.
 110 void InitializeRedirection() {
 111   if (!base::CommandLine::ForCurrentProcess()->HasSwitch(kFifoPath))
 112     return;
 113
 114   base::FilePath fifo_path =
 115       base::CommandLine::ForCurrentProcess()->GetSwitchValuePath(kFifoPath);
 116   base::FilePath directory = fifo_path.DirName();
 117   CHECK(base::CreateDirectoryAndGetError(directory, nullptr))
 118       << "Unable to create directory: " << directory.value();
 119   unlink(fifo_path.value().c_str());
 120   CHECK(base::android::CreateFIFO(fifo_path, 0666))
 121       << "Unable to create fifo: " << fifo_path.value();
 122   CHECK(base::android::RedirectStream(stdout, fifo_path, "w"))
 123       << "Failed to redirect stdout to file: " << fifo_path.value();
 124   CHECK(dup2(STDOUT_FILENO, STDERR_FILENO) != -1)
 125       << "Unable to redirect stderr to stdout.";
 126 }
 127
 128 }  // namespace
 129
 130 static void Init(JNIEnv* env,
 131                  jclass clazz,
 132                  jobject activity,
 133                  jstring mojo_shell_path,
 134                  jobjectArray jparameters,
 135                  jstring j_local_apps_directory,
 136                  jstring j_tmp_dir) {
 137   g_main_activiy.Get().Reset(env, activity);
 138
 139   // Setting the TMPDIR environment variable so that applications can use it.
 140   // TODO(qsr) We will need our subprocesses to inherit this.
 141   int return_value =
 142       setenv("TMPDIR",
 143              base::android::ConvertJavaStringToUTF8(env, j_tmp_dir).c_str(), 1);
 144   DCHECK_EQ(return_value, 0);
 145
 146   base::android::ScopedJavaLocalRef<jobject> scoped_activity(env, activity);
 147   base::android::InitApplicationContext(env, scoped_activity);
 148
 149   std::vector<std::string> parameters;
 150   parameters.push_back(
 151       base::android::ConvertJavaStringToUTF8(env, mojo_shell_path));
 152   base::android::AppendJavaStringArrayToStringVector(env, jparameters,
 153                                                      &parameters);
 154   base::CommandLine::Init(0, nullptr);
 155   base::CommandLine::ForCurrentProcess()->InitFromArgv(parameters);
 156   g_shell_runner.Get().reset(new MojoShellRunner(parameters));
 157
 158   InitializeLogging();
 159
 160   InitializeRedirection();
 161
 162   // We want ~MessageLoop to happen prior to ~Context. Initializing
 163   // LazyInstances is akin to stack-allocating objects; their destructors
 164   // will be invoked first-in-last-out.
 165   Context* shell_context = new Context();
 166   shell_context->SetShellFileRoot(base::FilePath(
 167       base::android::ConvertJavaStringToUTF8(env, j_local_apps_directory)));
 168   g_context.Get().reset(shell_context);
 169
 170   g_java_message_loop.Get().reset(new base::MessageLoopForUI);
 171   base::MessageLoopForUI::current()->Start();
 172
 173   // TODO(abarth): At which point should we switch to cross-platform
 174   // initialization?
 175
 176   gfx::GLSurface::InitializeOneOff();
 177 }
 178
 179 static jboolean Start(JNIEnv* env, jclass clazz) {
 180   if (!base::CommandLine::ForCurrentProcess()->GetArgs().size())
 181     return false;
 182
 183 #if defined(MOJO_SHELL_DEBUG_URL)
 184   base::CommandLine::ForCurrentProcess()->AppendArg(MOJO_SHELL_DEBUG_URL);
 185   // Sleep for 5 seconds to give the debugger a chance to attach.
 186   sleep(5);
 187 #endif
 188
 189   g_shell_thread.Get().reset(new base::DelegateSimpleThread(
 190       g_shell_runner.Get().get(), "ShellThread"));
 191   g_shell_thread.Get()->Start();
 192   return true;
 193 }
 194
 195 static void AddApplicationURL(JNIEnv* env, jclass clazz, jstring jurl) {
 196   base::CommandLine::ForCurrentProcess()->AppendArg(
 197       base::android::ConvertJavaStringToUTF8(env, jurl));
 198 }
 199
 200 bool RegisterShellMain(JNIEnv* env) {
 201   return RegisterNativesImpl(env);
 202 }
 203
 204 }  // namespace shell
 205 }  // namespace mojo
 206
 207 // TODO(vtl): Even though main() should never be called, mojo_shell fails to
 208 // link without it. Figure out if we can avoid this.
 209 int main(int argc, char** argv) {
 210   NOTREACHED();
 211 }