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:
Channel(const base::Callback<bool (IPC::Message *)> & callback)24 Channel(const base::Callback<bool(IPC::Message*)>& callback)
25 : callback_(callback) {}
26
~Channel()27 virtual ~Channel() {}
28
Send(IPC::Message * message)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
PepperInProcessRouter(RendererPpapiHostImpl * host_impl)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
~PepperInProcessRouter()50 PepperInProcessRouter::~PepperInProcessRouter() {}
51
GetPluginToRendererSender()52 IPC::Sender* PepperInProcessRouter::GetPluginToRendererSender() {
53 return plugin_to_host_router_.get();
54 }
55
GetRendererToPluginSender()56 IPC::Sender* PepperInProcessRouter::GetRendererToPluginSender() {
57 return host_to_plugin_router_.get();
58 }
59
GetPluginConnection(PP_Instance instance)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
OnPluginMsgReceived(const IPC::Message & msg)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
SendToHost(IPC::Message * msg)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
SendToPlugin(IPC::Message * msg)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
DispatchHostMsg(IPC::Message * msg)158 void PepperInProcessRouter::DispatchHostMsg(IPC::Message* msg) {
159 bool handled = host_impl_->GetPpapiHost()->OnMessageReceived(*msg);
160 DCHECK(handled);
161 }
162
DispatchPluginMsg(IPC::Message * msg)163 void PepperInProcessRouter::DispatchPluginMsg(IPC::Message* msg) {
164 bool handled = OnPluginMsgReceived(*msg);
165 DCHECK(handled);
166 }
167
SendToBrowser(IPC::Message * msg)168 bool PepperInProcessRouter::SendToBrowser(IPC::Message* msg) {
169 return RenderThread::Get()->Send(msg);
170 }
171
172 } // namespace content
173