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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ppapi/host/resource_message_filter.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/single_thread_task_runner.h"
#include "ipc/ipc_message.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/host/ppapi_host.h"
#include "ppapi/host/resource_host.h"
namespace ppapi {
namespace host {
namespace internal {
// static
void ResourceMessageFilterDeleteTraits::Destruct(
const ResourceMessageFilter* filter) {
if (!filter->deletion_task_runner_->BelongsToCurrentThread()) {
// During shutdown the object may not be deleted, but it should be okay to
// leak in that case.
filter->deletion_task_runner_->DeleteSoon(FROM_HERE, filter);
} else {
delete filter;
}
}
} // namespace internal
ResourceMessageFilter::ResourceMessageFilter()
: deletion_task_runner_(base::SingleThreadTaskRunner::GetCurrentDefault()),
reply_thread_task_runner_(
base::SingleThreadTaskRunner::GetCurrentDefault()),
resource_host_(nullptr) {}
ResourceMessageFilter::ResourceMessageFilter(
scoped_refptr<base::SingleThreadTaskRunner> reply_thread_task_runner)
: deletion_task_runner_(base::SingleThreadTaskRunner::GetCurrentDefault()),
reply_thread_task_runner_(reply_thread_task_runner),
resource_host_(nullptr) {}
ResourceMessageFilter::~ResourceMessageFilter() {
}
void ResourceMessageFilter::OnFilterAdded(ResourceHost* resource_host) {
resource_host_ = resource_host;
}
void ResourceMessageFilter::OnFilterDestroyed() {
resource_host_ = nullptr;
}
bool ResourceMessageFilter::HandleMessage(const IPC::Message& msg,
HostMessageContext* context) {
scoped_refptr<base::SequencedTaskRunner> runner =
OverrideTaskRunnerForMessage(msg);
if (runner.get()) {
if (runner->RunsTasksInCurrentSequence()) {
DispatchMessage(msg, *context);
} else {
// TODO(raymes): We need to make a copy so the context can be used on
// other threads. It would be better to have a thread-safe refcounted
// context.
HostMessageContext context_copy = *context;
runner->PostTask(FROM_HERE,
base::BindOnce(&ResourceMessageFilter::DispatchMessage,
this, msg, context_copy));
}
return true;
}
return false;
}
void ResourceMessageFilter::SendReply(const ReplyMessageContext& context,
const IPC::Message& msg) {
if (!reply_thread_task_runner_->BelongsToCurrentThread()) {
reply_thread_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&ResourceMessageFilter::SendReply, this, context, msg));
return;
}
if (resource_host_)
resource_host_->SendReply(context, msg);
}
scoped_refptr<base::SequencedTaskRunner>
ResourceMessageFilter::OverrideTaskRunnerForMessage(const IPC::Message& msg) {
return nullptr;
}
void ResourceMessageFilter::DispatchMessage(const IPC::Message& msg,
HostMessageContext context) {
RunMessageHandlerAndReply(msg, &context);
}
} // namespace host
} // namespace ppapi
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