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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ppapi/proxy/message_handler.h"
#include "ipc/ipc_message.h"
#include "ppapi/proxy/plugin_dispatcher.h"
#include "ppapi/proxy/ppapi_messages.h"
#include "ppapi/proxy/ppb_message_loop_proxy.h"
#include "ppapi/shared_impl/proxy_lock.h"
#include "ppapi/shared_impl/scoped_pp_var.h"
#include "ppapi/thunk/enter.h"
namespace ppapi {
namespace proxy {
namespace {
typedef void (*HandleMessageFunc)(PP_Instance, void*, const PP_Var*);
typedef void (*HandleBlockingMessageFunc)(
PP_Instance, void*, const PP_Var*, PP_Var*);
void HandleMessageWrapper(HandleMessageFunc function,
PP_Instance instance,
void* user_data,
ScopedPPVar message_data) {
CallWhileUnlocked(function, instance, user_data,
&message_data.get());
}
void HandleBlockingMessageWrapper(HandleBlockingMessageFunc function,
PP_Instance instance,
void* user_data,
ScopedPPVar message_data,
scoped_ptr<IPC::Message> reply_msg) {
PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
if (!dispatcher)
return;
PP_Var result = PP_MakeUndefined();
MessageLoopResource::GetCurrent()->
set_currently_handling_blocking_message(true);
CallWhileUnlocked(
function, instance, user_data, &message_data.get(), &result);
MessageLoopResource::GetCurrent()->
set_currently_handling_blocking_message(false);
PpapiMsg_PPPMessageHandler_HandleBlockingMessage::WriteReplyParams(
reply_msg.get(),
SerializedVarReturnValue::Convert(dispatcher, result),
true /* was_handled */);
dispatcher->Send(reply_msg.release());
}
} // namespace
// static
scoped_ptr<MessageHandler> MessageHandler::Create(
PP_Instance instance,
const PPP_MessageHandler_0_2* handler_if,
void* user_data,
PP_Resource message_loop,
int32_t* error) {
scoped_ptr<MessageHandler> result;
// The interface and all function pointers must be valid.
if (!handler_if ||
!handler_if->HandleMessage ||
!handler_if->HandleBlockingMessage ||
!handler_if->Destroy) {
*error = PP_ERROR_BADARGUMENT;
return result.Pass();
}
thunk::EnterResourceNoLock<thunk::PPB_MessageLoop_API>
enter_loop(message_loop, true);
if (enter_loop.failed()) {
*error = PP_ERROR_BADRESOURCE;
return result.Pass();
}
scoped_refptr<MessageLoopResource> message_loop_resource(
static_cast<MessageLoopResource*>(enter_loop.object()));
if (message_loop_resource->is_main_thread_loop()) {
*error = PP_ERROR_WRONG_THREAD;
return result.Pass();
}
result.reset(new MessageHandler(
instance, handler_if, user_data, message_loop_resource));
*error = PP_OK;
return result.Pass();
}
MessageHandler::~MessageHandler() {
// It's possible the message_loop_proxy is NULL if that loop has been quit.
// In that case, we unfortunately just can't call Destroy.
if (message_loop_->message_loop_proxy().get()) {
// The posted task won't have the proxy lock, but that's OK, it doesn't
// touch any internal state; it's a direct call on the plugin's function.
message_loop_->message_loop_proxy()->PostTask(FROM_HERE,
base::Bind(handler_if_->Destroy,
instance_,
user_data_));
}
}
bool MessageHandler::LoopIsValid() const {
return !!message_loop_->message_loop_proxy().get();
}
void MessageHandler::HandleMessage(ScopedPPVar var) {
message_loop_->message_loop_proxy()->PostTask(FROM_HERE,
RunWhileLocked(base::Bind(&HandleMessageWrapper,
handler_if_->HandleMessage,
instance_,
user_data_,
var)));
}
void MessageHandler::HandleBlockingMessage(ScopedPPVar var,
scoped_ptr<IPC::Message> reply_msg) {
message_loop_->message_loop_proxy()->PostTask(FROM_HERE,
RunWhileLocked(base::Bind(&HandleBlockingMessageWrapper,
handler_if_->HandleBlockingMessage,
instance_,
user_data_,
var,
base::Passed(reply_msg.Pass()))));
}
MessageHandler::MessageHandler(
PP_Instance instance,
const PPP_MessageHandler_0_2* handler_if,
void* user_data,
scoped_refptr<MessageLoopResource> message_loop)
: instance_(instance),
handler_if_(handler_if),
user_data_(user_data),
message_loop_(message_loop) {
}
} // namespace proxy
} // namespace ppapi
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