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