content/renderer/pepper/pepper_in_process_router.cc

   1 // Copyright (c) 2012 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/renderer/pepper/pepper_in_process_router.h"
   6
   7 #include "base/bind.h"
   8 #include "base/message_loop/message_loop.h"
   9 #include "content/public/renderer/render_thread.h"
  10 #include "content/renderer/pepper/renderer_ppapi_host_impl.h"
  11 #include "content/renderer/render_frame_impl.h"
  12 #include "ipc/ipc_message.h"
  13 #include "ipc/ipc_sender.h"
  14 #include "ppapi/proxy/ppapi_messages.h"
  15 #include "ppapi/shared_impl/ppapi_globals.h"
  16 #include "ppapi/shared_impl/resource_tracker.h"
  17
  18 using ppapi::UnpackMessage;
  19
  20 namespace content {
  21
  22 class PepperInProcessRouter::Channel : public IPC::Sender {
  23  public:
  24   Channel(const base::Callback<bool(IPC::Message*)>& callback)
  25       : callback_(callback) {}
  26
  27   virtual ~Channel() {}
  28
  29   virtual bool Send(IPC::Message* message) OVERRIDE {
  30     return callback_.Run(message);
  31   }
  32
  33  private:
  34   base::Callback<bool(IPC::Message*)> callback_;
  35 };
  36
  37 PepperInProcessRouter::PepperInProcessRouter(RendererPpapiHostImpl* host_impl)
  38     : host_impl_(host_impl),
  39       pending_message_id_(0),
  40       reply_result_(false),
  41       weak_factory_(this) {
  42   browser_channel_.reset(new Channel(base::Bind(
  43       &PepperInProcessRouter::SendToBrowser, base::Unretained(this))));
  44   host_to_plugin_router_.reset(new Channel(base::Bind(
  45       &PepperInProcessRouter::SendToPlugin, base::Unretained(this))));
  46   plugin_to_host_router_.reset(new Channel(
  47       base::Bind(&PepperInProcessRouter::SendToHost, base::Unretained(this))));
  48 }
  49
  50 PepperInProcessRouter::~PepperInProcessRouter() {}
  51
  52 IPC::Sender* PepperInProcessRouter::GetPluginToRendererSender() {
  53   return plugin_to_host_router_.get();
  54 }
  55
  56 IPC::Sender* PepperInProcessRouter::GetRendererToPluginSender() {
  57   return host_to_plugin_router_.get();
  58 }
  59
  60 ppapi::proxy::Connection PepperInProcessRouter::GetPluginConnection(
  61     PP_Instance instance) {
  62   int routing_id = 0;
  63   RenderFrame* frame = host_impl_->GetRenderFrameForInstance(instance);
  64   if (frame)
  65     routing_id = frame->GetRoutingID();
  66   return ppapi::proxy::Connection(
  67       browser_channel_.get(), plugin_to_host_router_.get(), routing_id);
  68 }
  69
  70 // static
  71 bool PepperInProcessRouter::OnPluginMsgReceived(const IPC::Message& msg) {
  72   // Emulate the proxy by dispatching the relevant message here.
  73   ppapi::proxy::ResourceMessageReplyParams reply_params;
  74   IPC::Message nested_msg;
  75
  76   if (msg.type() == PpapiPluginMsg_ResourceReply::ID) {
  77     // Resource reply from the renderer (no routing id).
  78     if (!UnpackMessage<PpapiPluginMsg_ResourceReply>(
  79             msg, &reply_params, &nested_msg)) {
  80       NOTREACHED();
  81       return false;
  82     }
  83   } else if (msg.type() == PpapiHostMsg_InProcessResourceReply::ID) {
  84     // Resource reply from the browser (has a routing id).
  85     if (!UnpackMessage<PpapiHostMsg_InProcessResourceReply>(
  86             msg, &reply_params, &nested_msg)) {
  87       NOTREACHED();
  88       return false;
  89     }
  90   } else {
  91     return false;
  92   }
  93   ppapi::Resource* resource =
  94       ppapi::PpapiGlobals::Get()->GetResourceTracker()->GetResource(
  95           reply_params.pp_resource());
  96   // If the resource doesn't exist, it may have been destroyed so just ignore
  97   // the message.
  98   if (resource)
  99     resource->OnReplyReceived(reply_params, nested_msg);
 100   return true;
 101 }
 102
 103 bool PepperInProcessRouter::SendToHost(IPC::Message* msg) {
 104   scoped_ptr<IPC::Message> message(msg);
 105
 106   if (!message->is_sync()) {
 107     // If this is a resource destroyed message, post a task to dispatch it.
 108     // Dispatching it synchronously can cause the host to re-enter the proxy
 109     // code while we're still in the resource destructor, leading to a crash.
 110     // http://crbug.com/276368.
 111     // This won't cause message reordering problems because the resource
 112     // destroyed message is always the last one sent for a resource.
 113     if (message->type() == PpapiHostMsg_ResourceDestroyed::ID) {
 114       base::MessageLoop::current()->PostTask(
 115           FROM_HERE,
 116           base::Bind(&PepperInProcessRouter::DispatchHostMsg,
 117                      weak_factory_.GetWeakPtr(),
 118                      base::Owned(message.release())));
 119       return true;
 120     } else {
 121       bool result = host_impl_->GetPpapiHost()->OnMessageReceived(*message);
 122       DCHECK(result) << "The message was not handled by the host.";
 123       return true;
 124     }
 125   }
 126
 127   pending_message_id_ = IPC::SyncMessage::GetMessageId(*message);
 128   reply_deserializer_.reset(
 129       static_cast<IPC::SyncMessage*>(message.get())->GetReplyDeserializer());
 130   reply_result_ = false;
 131
 132   bool result = host_impl_->GetPpapiHost()->OnMessageReceived(*message);
 133   DCHECK(result) << "The message was not handled by the host.";
 134
 135   pending_message_id_ = 0;
 136   reply_deserializer_.reset(NULL);
 137   return reply_result_;
 138 }
 139
 140 bool PepperInProcessRouter::SendToPlugin(IPC::Message* msg) {
 141   scoped_ptr<IPC::Message> message(msg);
 142   CHECK(!msg->is_sync());
 143   if (IPC::SyncMessage::IsMessageReplyTo(*message, pending_message_id_)) {
 144     if (!msg->is_reply_error())
 145       reply_result_ = reply_deserializer_->SerializeOutputParameters(*message);
 146   } else {
 147     CHECK(!pending_message_id_);
 148     // Dispatch plugin messages from the message loop.
 149     base::MessageLoop::current()->PostTask(
 150         FROM_HERE,
 151         base::Bind(&PepperInProcessRouter::DispatchPluginMsg,
 152                    weak_factory_.GetWeakPtr(),
 153                    base::Owned(message.release())));
 154   }
 155   return true;
 156 }
 157
 158 void PepperInProcessRouter::DispatchHostMsg(IPC::Message* msg) {
 159   bool handled = host_impl_->GetPpapiHost()->OnMessageReceived(*msg);
 160   DCHECK(handled);
 161 }
 162
 163 void PepperInProcessRouter::DispatchPluginMsg(IPC::Message* msg) {
 164   bool handled = OnPluginMsgReceived(*msg);
 165   DCHECK(handled);
 166 }
 167
 168 bool PepperInProcessRouter::SendToBrowser(IPC::Message* msg) {
 169   return RenderThread::Get()->Send(msg);
 170 }
 171
 172 }  // namespace content