ppapi/proxy/ppp_messaging_proxy.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 "ppapi/proxy/ppp_messaging_proxy.h"
   6
   7 #include <algorithm>
   8
   9 #include "ppapi/c/ppp_messaging.h"
  10 #include "ppapi/proxy/host_dispatcher.h"
  11 #include "ppapi/proxy/plugin_resource_tracker.h"
  12 #include "ppapi/proxy/plugin_var_tracker.h"
  13 #include "ppapi/proxy/ppapi_messages.h"
  14 #include "ppapi/proxy/serialized_var.h"
  15 #include "ppapi/shared_impl/ppapi_globals.h"
  16 #include "ppapi/shared_impl/proxy_lock.h"
  17 #include "ppapi/shared_impl/var_tracker.h"
  18
  19 namespace ppapi {
  20 namespace proxy {
  21
  22 namespace {
  23
  24 #if !defined(OS_NACL)
  25 void HandleMessage(PP_Instance instance, PP_Var message_data) {
  26   HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
  27   if (!dispatcher || (message_data.type == PP_VARTYPE_OBJECT)) {
  28     // The dispatcher should always be valid, and the browser should never send
  29     // an 'object' var over PPP_Messaging.
  30     NOTREACHED();
  31     return;
  32   }
  33
  34   dispatcher->Send(new PpapiMsg_PPPMessaging_HandleMessage(
  35       API_ID_PPP_MESSAGING,
  36       instance,
  37       SerializedVarSendInputShmem(dispatcher, message_data, instance)));
  38 }
  39
  40 static const PPP_Messaging messaging_interface = {
  41   &HandleMessage
  42 };
  43 #else
  44 // The NaCl plugin doesn't need the host side interface - stub it out.
  45 static const PPP_Messaging messaging_interface = {};
  46 #endif  // !defined(OS_NACL)
  47
  48 InterfaceProxy* CreateMessagingProxy(Dispatcher* dispatcher) {
  49   return new PPP_Messaging_Proxy(dispatcher);
  50 }
  51
  52 }  // namespace
  53
  54 PPP_Messaging_Proxy::PPP_Messaging_Proxy(Dispatcher* dispatcher)
  55     : InterfaceProxy(dispatcher),
  56       ppp_messaging_impl_(NULL) {
  57   if (dispatcher->IsPlugin()) {
  58     ppp_messaging_impl_ = static_cast<const PPP_Messaging*>(
  59         dispatcher->local_get_interface()(PPP_MESSAGING_INTERFACE));
  60   }
  61 }
  62
  63 PPP_Messaging_Proxy::~PPP_Messaging_Proxy() {
  64 }
  65
  66 // static
  67 const InterfaceProxy::Info* PPP_Messaging_Proxy::GetInfo() {
  68   static const Info info = {
  69     &messaging_interface,
  70     PPP_MESSAGING_INTERFACE,
  71     API_ID_PPP_MESSAGING,
  72     false,
  73     &CreateMessagingProxy,
  74   };
  75   return &info;
  76 }
  77
  78 bool PPP_Messaging_Proxy::OnMessageReceived(const IPC::Message& msg) {
  79   if (!dispatcher()->IsPlugin())
  80     return false;
  81
  82   bool handled = true;
  83   IPC_BEGIN_MESSAGE_MAP(PPP_Messaging_Proxy, msg)
  84     IPC_MESSAGE_HANDLER(PpapiMsg_PPPMessaging_HandleMessage,
  85                         OnMsgHandleMessage)
  86     IPC_MESSAGE_UNHANDLED(handled = false)
  87   IPC_END_MESSAGE_MAP()
  88   return handled;
  89 }
  90
  91 void PPP_Messaging_Proxy::OnMsgHandleMessage(
  92     PP_Instance instance, SerializedVarReceiveInput message_data) {
  93   PP_Var received_var(message_data.GetForInstance(dispatcher(), instance));
  94   // SerializedVarReceiveInput will decrement the reference count, but we want
  95   // to give the recipient a reference.
  96   PpapiGlobals::Get()->GetVarTracker()->AddRefVar(received_var);
  97   CallWhileUnlocked(ppp_messaging_impl_->HandleMessage,
  98                     instance,
  99                     received_var);
 100 }
 101
 102 }  // namespace proxy
 103 }  // namespace ppapi