content/browser/mojo/mojo_application_host.cc

   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 "content/browser/mojo/mojo_application_host.h"
   6
   7 #include "content/common/mojo/mojo_messages.h"
   8 #include "content/public/browser/browser_thread.h"
   9 #include "ipc/ipc_sender.h"
  10 #include "third_party/mojo/src/mojo/edk/embedder/platform_channel_pair.h"
  11
  12 namespace content {
  13 namespace {
  14
  15 base::PlatformFile PlatformFileFromScopedPlatformHandle(
  16     mojo::embedder::ScopedPlatformHandle handle) {
  17 #if defined(OS_POSIX)
  18   return handle.release().fd;
  19 #elif defined(OS_WIN)
  20   return handle.release().handle;
  21 #endif
  22 }
  23
  24 class ApplicationSetupImpl : public ApplicationSetup {
  25  public:
  26   ApplicationSetupImpl(ServiceRegistryImpl* service_registry,
  27                        mojo::InterfaceRequest<ApplicationSetup> request)
  28       : binding_(this, request.Pass()),
  29         service_registry_(service_registry) {
  30   }
  31
  32   ~ApplicationSetupImpl() override {
  33   }
  34
  35  private:
  36   // ApplicationSetup implementation.
  37   void ExchangeServiceProviders(
  38       mojo::InterfaceRequest<mojo::ServiceProvider> services,
  39       mojo::ServiceProviderPtr exposed_services) override {
  40     service_registry_->Bind(services.Pass());
  41     service_registry_->BindRemoteServiceProvider(exposed_services.Pass());
  42   }
  43
  44   mojo::Binding<ApplicationSetup> binding_;
  45   ServiceRegistryImpl* service_registry_;
  46 };
  47
  48 }  // namespace
  49
  50 MojoApplicationHost::MojoApplicationHost()
  51     : did_activate_(false) {
  52 #if defined(OS_ANDROID)
  53   service_registry_android_.reset(
  54       new ServiceRegistryAndroid(&service_registry_));
  55 #endif
  56 }
  57
  58 MojoApplicationHost::~MojoApplicationHost() {
  59 }
  60
  61 bool MojoApplicationHost::Init() {
  62   DCHECK(!client_handle_.is_valid()) << "Already initialized!";
  63
  64   mojo::embedder::PlatformChannelPair channel_pair;
  65
  66   scoped_refptr<base::TaskRunner> io_task_runner;
  67   if (io_task_runner_override_) {
  68     io_task_runner = io_task_runner_override_;
  69   } else {
  70     io_task_runner =
  71         BrowserThread::UnsafeGetMessageLoopForThread(BrowserThread::IO)
  72           ->task_runner();
  73   }
  74
  75   mojo::ScopedMessagePipeHandle message_pipe = channel_init_.Init(
  76       PlatformFileFromScopedPlatformHandle(channel_pair.PassServerHandle()),
  77       io_task_runner);
  78   if (!message_pipe.is_valid())
  79     return false;
  80
  81   // Forward this to the client once we know its process handle.
  82   client_handle_ = channel_pair.PassClientHandle();
  83
  84   application_setup_.reset(new ApplicationSetupImpl(
  85       &service_registry_,
  86       mojo::MakeRequest<ApplicationSetup>(message_pipe.Pass())));
  87   return true;
  88 }
  89
  90 void MojoApplicationHost::Activate(IPC::Sender* sender,
  91                                    base::ProcessHandle process_handle) {
  92   DCHECK(!did_activate_);
  93   DCHECK(client_handle_.is_valid());
  94
  95   base::PlatformFile client_file =
  96       PlatformFileFromScopedPlatformHandle(client_handle_.Pass());
  97   did_activate_ = sender->Send(new MojoMsg_Activate(
  98       IPC::GetFileHandleForProcess(client_file, process_handle, true)));
  99 }
 100
 101 void MojoApplicationHost::WillDestroySoon() {
 102   channel_init_.WillDestroySoon();
 103 }
 104
 105 void MojoApplicationHost::ShutdownOnIOThread() {
 106   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 107   channel_init_.ShutdownOnIOThread();
 108 }
 109
 110 void MojoApplicationHost::OverrideIOTaskRunnerForTest(
 111     scoped_refptr<base::TaskRunner> io_task_runner) {
 112   io_task_runner_override_ = io_task_runner;
 113 }
 114
 115 }  // namespace content